/* ==========================================================================
   Chess Studio — Solid Chess.com-Inspired Dark Charcoal & Tournament Green
   100% opaque matte surfaces, tactile 3D action buttons, zero glassmorphism.
   ========================================================================== */

:root {
  --hh: 58px;                      /* header height */
  --font-ui: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Inter', system-ui, 'Segoe UI', Roboto, sans-serif;
  --font-sans: var(--font-ui);
  --font-serif: var(--font-ui);    /* Unified clean sans-serif across all headings */
  --font-mono: 'SF Mono', 'JetBrains Mono', ui-monospace, Menlo, Consolas, monospace;
  --serif: var(--font-ui);
  --mono: var(--font-mono);
  --r-sm: 12px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 28px;
  --radius: 18px;
  --radius-lg: 24px;
  --radius-xl: 28px;
  --ease: cubic-bezier(.22, 1, .36, 1);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #302e2b;        /* Chess.com signature warm dark charcoal canvas */
  --bg-2: #21201d;      /* Solid dark header & workspace stage */
  --surface: #262522;   /* 100% solid primary card & panel background */
  --bg-elev: #2b2926;   /* 100% solid elevated inner sub-card */
  --surface-2: #383633; /* 100% solid secondary button & tile surface */
  --surface-3: #454340; /* 100% solid hover & active pill surface */
  --line: #3c3a37;      /* 100% solid crisp border */
  --line-2: #4b4845;    /* 100% solid emphasized border */
  --text: #ffffff;      /* Pure crisp white primary text */
  --text-2: #c3c2c0;    /* Warm light ash secondary text */
  --text-3: #8b8987;    /* Muted stone caption text */
  --text-dim: var(--text-2);
  --text-faint: var(--text-3);
  --accent: #81b64c;         /* Iconic Chess.com Play Green */
  --accent-2: #95bb4a;       /* Hover bright green */
  --accent-shadow: #537133;  /* Tactile 3D green bottom edge */
  --accent-ink: #ffffff;     /* Crisp white button label */
  --accent-text: #81b64c;    /* Green accent text */
  --gold: var(--accent);
  --accent-soft: #364229;    /* 100% solid dark olive-green badge/active surface */
  --good: #81b64c;  --good-soft: #364229;
  --bad: #ca3431;   --bad-soft: #442726;
  --info: #5c8bb0;
  --shadow: 0 8px 20px rgba(0, 0, 0, .38);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, .28);
  --hero-glow: none;
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #ebe9e4;        /* Solid warm stone canvas */
  --bg-2: #dfdcd5;      /* Solid header & recessed stage */
  --surface: #ffffff;   /* 100% solid white card */
  --bg-elev: #f5f4f0;   /* 100% solid warm ivory sub-card */
  --surface-2: #e8e6e0; /* 100% solid secondary button surface */
  --surface-3: #dcd9d0; /* 100% solid hover surface */
  --line: #dcd9d0;      /* 100% solid border */
  --line-2: #c7c3b8;    /* 100% solid stronger border */
  --text: #262522;
  --text-2: #52504c;
  --text-3: #7d7a74;
  --text-dim: var(--text-2);
  --text-faint: var(--text-3);
  --accent: #769656;
  --accent-2: #81b64c;
  --accent-shadow: #537133;
  --accent-ink: #ffffff;
  --accent-text: #537133;
  --gold: var(--accent);
  --accent-soft: #e4eed8;
  --good: #5d9948;  --good-soft: #e4eed8;
  --bad: #ca3431;   --bad-soft: #f9e2e2;
  --info: #4b7399;
  --shadow: 0 6px 18px rgba(38, 37, 34, .08);
  --shadow-sm: 0 3px 10px rgba(38, 37, 34, .06);
  --hero-glow: none;
}

/* board palettes (authentic Chess.com green & wood boards) */
:root, :root[data-board="green"]  { --sq-l: #eeeed2; --sq-d: #769656; }
:root[data-board="walnut"] { --sq-l: #edd6b0; --sq-d: #b58863; }
:root[data-board="blue"]   { --sq-l: #eae9d2; --sq-d: #4b7399; }
:root[data-board="ash"]    { --sq-l: #dcdcdc; --sq-d: #6e6e6e; }

/* ── base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100dvh;
  background: var(--bg); color: var(--text);
  font: 400 14px/1.55 var(--font-ui);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, p, ul, ol, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
button:disabled { cursor: not-allowed; }
input, select { font: inherit; color: inherit; }
svg { display: block; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 10px; }
::selection { background: var(--accent-soft); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--accent); color: var(--accent-ink); padding: 8px 14px; border-radius: 999px; z-index: 999; }
.skip:focus { left: 8px; }
* { scrollbar-width: thin; scrollbar-color: var(--line-2) transparent; }

.mono { font-family: var(--font-mono); font-size: .86em; }
.muted { color: var(--text-2); }
.faint { color: var(--text-3); }
.ic { flex: none; }
kbd {
  font: 600 11px/1 var(--font-mono); padding: 3px 7px; border-radius: 7px;
  background: var(--surface-2); border: 1px solid var(--line-2); color: var(--text-2);
}
.eyebrow { font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent-text); }
.lede { color: var(--text-2); font-size: 14.5px; line-height: 1.6; max-width: 58ch; }

/* ── controls: Solid tactile Chess.com buttons, chips, bars ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  height: 38px; padding: 0 16px; border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--line-2); color: var(--text);
  font-weight: 600; font-size: 13px; white-space: nowrap;
  box-shadow: 0 2px 0 rgba(0, 0, 0, .25);
  transition: background .14s var(--ease), border-color .14s var(--ease), color .14s var(--ease), transform .12s var(--ease);
}
.btn:hover:not(:disabled) { background: var(--surface-3); border-color: var(--text-3); transform: translateY(-1px); }
.btn:active:not(:disabled) { transform: translateY(1px); box-shadow: none; }
.btn:disabled { opacity: .45; }
.btn.primary {
  background: var(--accent); border-color: var(--accent); color: #ffffff;
  font-weight: 700; text-shadow: 0 1px 0 rgba(0, 0, 0, .22);
  box-shadow: 0 3px 0 var(--accent-shadow);
}
.btn.primary:hover:not(:disabled) {
  background: var(--accent-2); border-color: var(--accent-2);
  box-shadow: 0 3px 0 var(--accent-shadow);
}
.btn.primary:active:not(:disabled) {
  transform: translateY(2px); box-shadow: 0 1px 0 var(--accent-shadow);
}
.btn.ghost { background: var(--bg-elev); border-color: var(--line); color: var(--text-2); box-shadow: none; }
.btn.ghost:hover:not(:disabled) { background: var(--surface-2); border-color: var(--line-2); color: var(--text); }
.btn.danger { color: var(--bad); }
.btn.xs { height: 28px; padding: 0 11px; font-size: 11.5px; border-radius: 999px; gap: 4px; }
.btn.sm { height: 34px; padding: 0 14px; font-size: 12.5px; border-radius: 999px; }
.btn.lg { height: 44px; padding: 0 22px; font-size: 14px; border-radius: 999px; }
.btn-sub { font-weight: 500; opacity: .85; font-size: 12px; max-width: 18ch; overflow: hidden; text-overflow: ellipsis; }

.icon-btn {
  width: 36px; height: 36px; padding: 0; flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--line); color: var(--text-2);
  transition: background .14s var(--ease), color .14s var(--ease);
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); }

.link { background: none; border: 0; padding: 0; color: var(--accent-text); font-weight: 600; font-size: 13px; }
.link:hover:not(:disabled) { text-decoration: underline; }
.link:disabled { color: var(--text-3); }

.chip {
  display: inline-flex; align-items: center; height: 24px; padding: 0 10px; border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--line); color: var(--text-2); font-size: 11.5px; font-weight: 600; white-space: nowrap;
}
.chip.eco { font-family: var(--font-mono); color: var(--accent-text); background: var(--accent-soft); border-color: var(--accent); }
.chip-btn {
  height: 32px; padding: 0 14px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--surface); color: var(--text-2); font-size: 12.5px; font-weight: 600; white-space: nowrap;
  transition: all .14s var(--ease);
}
.chip-btn:hover { background: var(--surface-2); color: var(--text); }
.chip-btn.on { background: var(--accent-soft); color: var(--accent-text); border-color: var(--accent); font-weight: 700; }

.tag { font-size: 11px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--text-3); display: inline-flex; gap: 4px; align-items: center; }
.tag.ok { color: var(--good); }
.tag.go { color: var(--accent-text); }

.bar { display: block; flex: 1; height: 6px; border-radius: 99px; background: var(--surface-3); overflow: hidden; min-width: 40px; }
.bar > i { display: block; height: 100%; border-radius: inherit; background: var(--good); transition: width .5s var(--ease); }
.bar.gold > i { background: var(--accent); }
.bar.slim { height: 4px; }

.pips { display: inline-flex; gap: 3px; vertical-align: middle; }
.pips i { width: 12px; height: 4px; border-radius: 99px; background: var(--surface-3); }
.pips i.on { background: var(--accent); }

.badge {
  display: inline-grid; place-items: center; min-width: 16px; height: 16px; padding: 0 4px;
  border-radius: 99px; background: var(--accent); color: var(--accent-ink); font-size: 10.5px; font-weight: 700; margin-left: 4px;
}

.verdict {
  display: inline-flex; align-items: center; gap: 6px; padding: 2px 9px 2px 2px; border-radius: 99px;
  background: var(--surface-2); border: 1px solid var(--line); color: var(--text-2); font-size: 11.5px; font-weight: 600; white-space: nowrap;
}
.verdict b {
  min-width: 24px; height: 20px; padding: 0 5px; border-radius: 99px; display: grid; place-items: center;
  background: var(--surface); color: var(--text); font-weight: 700; font-size: 12px;
}
.verdict.w1 b, .verdict.w2 b, .verdict.w3 b { background: #eeeed2; color: #262522; }
.verdict.b1 b, .verdict.b2 b, .verdict.b3 b { background: #262522; color: #eeeed2; }

.res { font: 600 11.5px/1 var(--font-mono); padding: 4px 8px; border-radius: 999px; background: var(--surface-2); color: var(--text-2); }
.res-w { background: #eeeed2; color: #262522; }
.res-b { background: #21201d; color: #eeeed2; border: 1px solid var(--line-2); }

/* ── Solid Chess.com-style Top Navigation Bar (No Glass Blur) ── */
.topbar {
  position: sticky; top: 0; z-index: 50; height: var(--hh);
  display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 0 24px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 9px; flex-shrink: 0; min-width: 0; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 9px; flex-shrink: 0;
  background: var(--accent); border: 1px solid var(--accent-shadow);
  display: inline-flex; align-items: center; justify-content: center; padding: 3px;
}
.brand-mark svg { width: 100%; height: 100%; display: block; }
.brand-text { display: inline-flex; align-items: center; line-height: 1; }
.brand-text b { font-weight: 700; font-size: 15px; letter-spacing: -.015em; color: var(--text); white-space: nowrap; }

.topnav {
  display: flex; align-items: center; gap: 4px; margin-left: 8px; flex: 1; min-width: 0;
  overflow-x: auto; scrollbar-width: none; -ms-overflow-style: none;
}
.topnav::-webkit-scrollbar { display: none; }
.topnav a {
  display: inline-flex; align-items: center; justify-content: center; height: 36px; padding: 0 14px; border-radius: 999px;
  color: var(--text-2); font-weight: 600; font-size: 13px; line-height: 1; white-space: nowrap; flex: none;
  transition: background .14s var(--ease), color .14s var(--ease);
}
.topnav a:hover { color: var(--text); background: var(--surface-2); }
.topnav a.active { color: #ffffff; background: var(--accent); font-weight: 700; }

.top-actions { margin-left: auto; display: inline-flex; align-items: center; gap: 6px; flex-shrink: 0; }
.search-trigger {
  display: inline-flex; align-items: center; gap: 8px; height: 36px; min-width: 148px; padding: 0 9px 0 12px;
  border-radius: 999px; background: var(--surface); border: 1px solid var(--line); color: var(--text-3);
}
.search-trigger:hover { border-color: var(--line-2); color: var(--text-2); }
.search-trigger span { flex: 1; text-align: left; font-size: 12.5px; white-space: nowrap; }
.streak {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 36px; padding: 0 11px; border-radius: 999px; flex-shrink: 0;
  background: var(--surface); border: 1px solid var(--line);
  color: var(--text-2); font-weight: 700; font-size: 13px; line-height: 1; white-space: nowrap;
  text-decoration: none; cursor: pointer;
  transition: background .14s var(--ease), color .14s var(--ease), border-color .14s var(--ease), box-shadow .14s var(--ease);
}
.streak:hover {
  background: var(--surface-2); border-color: var(--line-2); color: var(--text);
}
.streak svg {
  width: 16px; height: 16px; flex-shrink: 0;
  color: var(--text-3);
  transition: color .14s var(--ease), transform .14s var(--ease);
}
.streak b {
  font-family: var(--font-mono); font-weight: 700; font-size: 13px;
  color: var(--text-2); line-height: 1;
  transition: color .14s var(--ease);
}
.streak:hover svg {
  transform: scale(1.1);
}
.streak.lit {
  color: var(--text);
}
.streak.lit svg {
  color: #e57e25;
  filter: drop-shadow(0 1px 2px rgba(229, 126, 37, .25));
}
.streak.lit b {
  color: var(--text);
}
.streak.lit:hover {
  background: var(--surface-2); border-color: var(--line-2);
}

/* ── page shell ─────────────────────────────────────── */
.page { max-width: 1080px; margin: 0 auto; padding: 28px 24px 64px; }
.page > * { animation: rise .28s var(--ease) both; }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.page-head h1 { font: 700 clamp(24px, 3vw, 32px)/1.15 var(--font-ui); letter-spacing: -.025em; margin: 4px 0 8px; }
.page-head-stat { text-align: right; }
.page-head-stat b, .phs-num { display: block; font: 700 28px/1 var(--font-mono); color: var(--accent-text); }
.page-head-stat span, .phs-lbl { font-size: 11px; color: var(--text-3); text-transform: uppercase; letter-spacing: .08em; }

.toolbar { display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: center; margin-bottom: 22px; }
.field.search {
  display: flex; align-items: center; gap: 10px; height: 40px; padding: 0 14px; flex: 1 1 280px; max-width: 420px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 999px; color: var(--text-3);
}
.field.search:focus-within { border-color: var(--accent); color: var(--text-2); }
.field.search input { flex: 1; background: none; border: 0; outline: 0; min-width: 0; color: var(--text); font-size: 13.5px; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }

.block { margin-top: 32px; }
.block-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 12px; gap: 12px; }
.block-head h2 { font: 600 18px/1.25 var(--font-ui); letter-spacing: -.015em; }

.empty { padding: 48px 16px; text-align: center; color: var(--text-2); border: 1px dashed var(--line-2); border-radius: var(--r-lg); }
.empty b { color: var(--text); display: block; margin-bottom: 4px; }

/* ── home ───────────────────────────────────────────── */
.hero {
  display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 36px; align-items: center;
  padding: 28px 32px; border: 1px solid var(--line); border-radius: var(--r-lg);
  background: var(--surface); box-shadow: var(--shadow);
}
.hero h1 { font: 700 clamp(26px, 3.4vw, 36px)/1.12 var(--font-ui); letter-spacing: -.025em; margin: 6px 0 10px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.hero-board { display: block; }
.hero-board .mini { width: 100%; border-radius: 8px; border: 1px solid var(--line); transition: transform .2s var(--ease); }
.hero-board:hover .mini { transform: translateY(-2px); }
.hero-board-cap { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-top: 10px; font-weight: 600; font-size: 13px; }
.hero-board-cap i { font: 400 12px var(--font-mono); color: var(--text-3); font-style: normal; }

.stats { display: grid; grid-template-columns: 1.15fr repeat(4, 1fr); gap: 12px; margin-top: 14px; }
.stat {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 16px; display: flex; flex-direction: column; gap: 6px; min-width: 0;
}
.stat-k { font-size: 11px; color: var(--text-3); font-weight: 600; text-transform: uppercase; letter-spacing: .06em; display: flex; gap: 6px; align-items: center; }
.stat-v { font: 700 26px/1.1 var(--font-mono); letter-spacing: -.02em; }
.stat-v small { font: 500 13px var(--font-ui); color: var(--text-3); margin-left: 3px; letter-spacing: 0; }
.stat-v.hot { color: var(--accent-text); }
.stat .bar { margin-top: auto; }
.stat .link { text-align: left; margin-top: auto; }
.stat-ring { flex-direction: row; align-items: center; gap: 14px; position: relative; }
.ring { transform: none; }
.ring-bg { fill: none; stroke: var(--surface-3); stroke-width: 8; }
.ring-fg { fill: none; stroke: var(--accent); stroke-width: 8; stroke-linecap: round; transition: stroke-dashoffset .8s var(--ease); }
.ring-num b { display: block; font: 700 24px/1 var(--font-mono); }
.ring-num span { font-size: 11.5px; color: var(--text-3); }
.stat-ring .ring { width: 76px; height: 76px; }
.stat-ring .ring-num { position: static; }
.week { display: flex; gap: 5px; align-items: flex-end; height: 36px; margin-top: auto; }
.week span { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; height: 100%; gap: 3px; }
.week i { width: 100%; border-radius: 3px; background: var(--surface-3); min-height: 5px; }
.week i.some { background: color-mix(in srgb, var(--accent) 45%, var(--surface-3)); }
.week i.hit { background: var(--accent); }
.week em { font: 600 9px var(--font-ui); color: var(--text-3); font-style: normal; }

.parts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.part-card {
  display: flex; gap: 14px; padding: 16px; border-radius: var(--r-lg);
  background: var(--surface); border: 1px solid var(--line); transition: border-color .15s, background .15s;
}
.part-card:hover { border-color: var(--accent); background: var(--surface-2); }
.part-num {
  flex: none; width: 42px; height: 42px; border-radius: 10px; display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent-text); font: 700 15px var(--font-mono);
}
.part-num.sm { width: 38px; height: 38px; font-size: 16px; border-radius: 11px; }
.part-body { display: flex; flex-direction: column; gap: 4px; min-width: 0; flex: 1; }
.part-body b { font-size: 15px; }
.part-body em { font-style: normal; font-family: var(--font-mono); font-size: 12px; color: var(--text-3); }
.part-body .bar { margin: 8px 0 4px; flex: none; }
.part-body small { color: var(--text-3); font-size: 12px; }

.cards3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.line-card {
  display: flex; gap: 14px; padding: 14px; border-radius: var(--r-lg); background: var(--surface);
  border: 1px solid var(--line); transition: border-color .15s, transform .15s var(--ease);
}
.line-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.lc-body { display: flex; flex-direction: column; gap: 6px; align-items: flex-start; min-width: 0; }
.lc-body small { color: var(--text-3); font-size: 12px; }
.lc-body b { font-size: 15px; line-height: 1.3; }

.due-list { display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); overflow: hidden; }
.due-row { display: flex; align-items: center; gap: 12px; padding: 14px 18px; }
.due-row + .due-row { border-top: 1px solid var(--line); }
.due-row:hover { background: var(--surface-2); }
.due-row > span:nth-child(2) { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.due-row em { font-style: normal; color: var(--text-3); margin-left: 6px; }
.side-dot { width: 12px; height: 12px; border-radius: 50%; border: 1px solid var(--line-2); flex: none; }
.side-dot.w { background: #f3eee4; }
.side-dot.b { background: #1c1a17; border-color: #6d655a; }

/* mini boards */
.mini { display: block; width: 100%; aspect-ratio: 1; border-radius: 14px; }
.mini.sm { width: 84px; flex: none; }
.m-l { fill: var(--sq-l); }
.m-d { fill: var(--sq-d); }

/* ── library ────────────────────────────────────────── */
.lib-part { margin-bottom: 40px; }
.lib-part-head { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.lib-part-head h2 { font: 600 20px/1.2 var(--font-serif); }
.lib-part-head em { font: 400 12px var(--font-mono); color: var(--text-3); font-style: normal; }
.lib-part-head .bar { max-width: 220px; margin-left: auto; }
.lib-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 12px; }
.op-card {
  position: relative; display: flex; gap: 14px; padding: 14px; border-radius: var(--r-lg);
  background: var(--surface); border: 1px solid var(--line);
  transition: border-color .15s, transform .15s var(--ease), box-shadow .15s;
}
.op-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); }
.op-body { display: flex; flex-direction: column; gap: 6px; min-width: 0; flex: 1; }
.op-top b { font-size: 15px; line-height: 1.3; display: block; }
.op-meta { display: flex; gap: 8px; align-items: center; min-width: 0; }
.op-meta .mono { color: var(--text-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.op-foot { display: flex; justify-content: space-between; gap: 8px; font-size: 12px; color: var(--text-3); margin-top: auto; }
.resume-flag {
  position: absolute; top: -9px; right: 14px; font-size: 10px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  background: var(--accent); color: var(--accent-ink); padding: 3px 8px; border-radius: 99px;
}

/* ── train ──────────────────────────────────────────── */
.train-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 14px; }
.tcard {
  display: flex; flex-direction: column; gap: 10px; align-items: flex-start; padding: 24px;
  border-radius: 22px; background: var(--surface); border: 1px solid var(--line);
}
.tcard.main { background: var(--hero-glow), var(--surface); border-color: var(--line-2); }
.tcard h2 { font: 600 22px var(--font-serif); }
.tcard p { color: var(--text-2); flex: 1; }
.tcard p b { color: var(--text); }
.tcard .bar { width: 100%; flex: none; }
.tcard-ic { width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent-text); }

.summary { display: grid; place-items: center; padding-top: 40px; }
.sum-card { text-align: center; padding: 48px 40px; max-width: 560px; width: 100%; border-radius: 28px; background: var(--hero-glow), var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); }
.sum-card h1 { font: 600 40px var(--font-serif); margin: 8px 0 28px; letter-spacing: -.02em; }
.sum-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 32px; }
.sum-stats b { display: block; font: 600 28px var(--font-serif); }
.sum-stats span { font-size: 12px; color: var(--text-3); }
.sum-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ── games ──────────────────────────────────────────── */
.game-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 12px; }
.game-card {
  display: flex; gap: 14px; padding: 14px; border-radius: var(--r-lg); background: var(--surface); border: 1px solid var(--line);
  transition: border-color .15s, transform .15s var(--ease);
}
.game-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.gc-body { display: flex; flex-direction: column; gap: 4px; min-width: 0; flex: 1; }
.gc-body b { font-size: 15px; line-height: 1.3; }
.gc-body b i { font-weight: 400; color: var(--text-3); font-style: normal; font-size: 12px; margin: 0 2px; }
.gc-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: auto; padding-top: 6px; }
.gc-foot .chip { overflow: hidden; text-overflow: ellipsis; max-width: 70%; display: inline-block; line-height: 24px; }

/* ==========================================================================
   WORKSPACE: board + panel
   ========================================================================== */
body.in-ws { overflow: hidden; }
.ws {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(380px, 450px); gap: 28px;
  height: calc(100dvh - var(--hh)); max-width: 1480px; margin: 0 auto; padding: 18px 28px 22px;
}
.ws-stage { display: flex; align-items: center; justify-content: center; min-width: 0; min-height: 0; }
.board-block {
  /* board = as wide as the column allows, but never taller than the viewport minus chrome */
  --bs: max(300px, min(100%, calc(100dvh - var(--hh) - 40px - 68px - 60px)));
  width: var(--bs);
}
.board-host { width: 100%; aspect-ratio: 1; }

.pstrip { height: 34px; display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-2); padding: 0 2px; min-width: 0; }
.pname { color: var(--text); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pdot { width: 12px; height: 12px; border-radius: 50%; flex: none; border: 1px solid var(--line-2); }
.pdot.w { background: #f3eee4; }
.pdot.b { background: #1c1a17; border-color: #766e60; }
.pdot.turn { box-shadow: 0 0 0 3px var(--accent-soft), 0 0 0 1px var(--accent); animation: pulse 1.6s ease-in-out infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 5px transparent, 0 0 0 1px var(--accent); } }
.you { font-size: 10px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; background: var(--accent); color: var(--accent-ink); padding: 2px 7px; border-radius: 99px; }
.caps { display: flex; margin-left: 6px; min-width: 0; }
.cap { width: 17px; height: 17px; margin-left: -7px; filter: drop-shadow(0 0 1px rgba(0,0,0,.35)); }
.cap:first-child { margin-left: 0; }
.mdiff { font-weight: 700; font-size: 12px; color: var(--text-2); }

.controls { display: flex; align-items: center; justify-content: center; gap: 6px; height: 60px; padding-top: 6px; }
.cbtn {
  width: 54px; height: 46px; display: grid; place-items: center; border-radius: 13px;
  background: var(--surface); border: 1px solid var(--line); color: var(--text);
  transition: background .12s, transform .08s, border-color .12s;
}
.cbtn:hover:not(:disabled) { background: var(--surface-3); border-color: var(--line-2); }
.cbtn:active:not(:disabled) { transform: scale(.96); }
.cbtn:disabled { opacity: .35; }
.cbtn.play { width: 72px; background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.cbtn.play:hover:not(:disabled) { background: var(--accent-2); }
.cbtn.play:disabled { background: var(--surface); border-color: var(--line); color: var(--text); }
.csep { width: 1px; height: 24px; background: var(--line); margin: 0 6px; }

/* ── the board ──────────────────────────────────────── */
.cb { position: relative; width: 100%; height: 100%; touch-action: none; user-select: none; -webkit-user-select: none;
  border-radius: 10px; box-shadow: 0 22px 44px -18px rgba(0,0,0,.6), 0 0 0 1px rgba(0,0,0,.25); }
.cb-squares { position: absolute; inset: 0; display: grid; grid-template-columns: repeat(8, 1fr); grid-template-rows: repeat(8, 1fr); border-radius: 10px; overflow: hidden; }
.sq { position: relative; }
.sq.light { background: var(--sq-l); }
.sq.dark  { background: var(--sq-d); }
.sq::before { content: ''; position: absolute; inset: 0; pointer-events: none; }
.sq.last::before { background: rgba(255, 210, 60, .42); }
.sq.sel::before  { background: rgba(255, 210, 60, .68); }
.sq.dot::after { content: ''; position: absolute; left: 50%; top: 50%; width: 30%; height: 30%; transform: translate(-50%, -50%); border-radius: 50%; background: rgba(20, 20, 20, .26); pointer-events: none; z-index: 3; }
.sq.ring { background-image: radial-gradient(circle, transparent 0 56%, rgba(20,20,20,.26) 58% 100%); }
.sq.over::before { background: rgba(255, 255, 255, .28); }
.sq.check { background-image: radial-gradient(circle, rgba(255,40,40,.95) 0, rgba(235,60,50,.65) 30%, rgba(170,0,0,0) 78%); }
.sq.hint { box-shadow: inset 0 0 0 4px var(--accent), inset 0 0 22px rgba(255, 210, 60, .55); }
.sq.mk-green  { box-shadow: inset 0 0 0 5px rgba(63,155,77,.8); }
.sq.mk-red    { box-shadow: inset 0 0 0 5px rgba(216,68,63,.85); }
.sq.mk-blue   { box-shadow: inset 0 0 0 5px rgba(59,130,214,.85); }
.sq.mk-yellow { box-shadow: inset 0 0 0 5px rgba(226,169,43,.9); }
.sq.flash-bad::before  { animation: flash-bad .7s ease-out; }
.sq.flash-good::before { animation: flash-good .7s ease-out; }
@keyframes flash-bad  { 0%, 40% { background: rgba(235, 64, 52, .75); } 100% { background: transparent; } }
@keyframes flash-good { 0%, 40% { background: rgba(90, 190, 110, .7); } 100% { background: transparent; } }

.co { position: absolute; font: 700 clamp(9px, 1.4vw, 12px)/1 var(--font-ui); font-style: normal; pointer-events: none; z-index: 2; }
.co-r { top: 4px; left: 4px; }
.co-f { bottom: 3px; right: 4px; }
.sq.light .co { color: var(--sq-d); }
.sq.dark .co  { color: var(--sq-l); }

.cb-tints, .cb-pieces { position: absolute; inset: 0; pointer-events: none; }
.tint { position: absolute; left: 0; top: 0; width: 12.5%; height: 12.5%; display: flex; align-items: flex-end; justify-content: center; }
.tint span { font: 700 9px/1.1 var(--font-ui); color: #fff; text-shadow: 0 1px 2px rgba(0,0,0,.8); padding-bottom: 3px; text-align: center; letter-spacing: .02em; }
.tint.tint-star { align-items: center; justify-content: center; box-shadow: inset 0 0 0 2px rgba(250, 204, 21, 0.55); }
.tint.tint-star span { font-size: clamp(22px, 4.2vw, 34px); line-height: 1; color: #facc15; text-shadow: 0 2px 6px rgba(0,0,0,.65), 0 0 12px rgba(250,204,21,.65); padding-bottom: 0; }

.pc { position: absolute; left: 0; top: 0; width: 12.5%; height: 12.5%; transition: transform .2s var(--ease), opacity .2s; will-change: transform; z-index: 5; }
.pc svg { width: 100%; height: 100%; }
.pc.instant, .cb-pieces.no-anim .pc { transition: none; }
.pc.drag { transition: none; z-index: 30; }
.pc.drag svg { transform: scale(1.14); filter: drop-shadow(0 8px 8px rgba(0,0,0,.4)); }
.pc.gone { opacity: 0; transform-origin: center; }
.pc.pop svg { animation: pop .22s var(--ease); }
@keyframes pop { from { transform: scale(.6); opacity: 0; } to { transform: none; opacity: 1; } }

.cb-arrows { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 10; }

.cb-promo { position: absolute; inset: 0; z-index: 40; }
.promo-scrim { position: absolute; inset: 0; background: rgba(0,0,0,.5); border-radius: 10px; }
.promo-opt {
  position: absolute; left: 0; top: 0; width: 12.5%; height: 12.5%; padding: 4px; border: 0; border-radius: 12px;
  background: #f3eee4; box-shadow: 0 6px 18px rgba(0,0,0,.35);
}
.promo-opt:hover { background: var(--accent); }
.promo-opt svg { width: 100%; height: 100%; }

.cb.shake { animation: shake .32s; }
@keyframes shake { 20% { transform: translateX(-5px); } 40% { transform: translateX(5px); } 60% { transform: translateX(-3px); } 80% { transform: translateX(3px); } }

/* ── panel ──────────────────────────────────────────── */
.ws-panel {
  display: flex; flex-direction: column; min-height: 0; min-width: 0; overflow: hidden;
  background: var(--surface); border: 1px solid var(--line); border-radius: 20px; box-shadow: var(--shadow);
}
.ph { padding: 18px 22px 0; border-bottom: 1px solid var(--line); flex: none; }
.crumbs { display: flex; gap: 8px; align-items: center; font-size: 12px; color: var(--text-3); font-weight: 600; }
.crumbs a:hover { color: var(--accent-text); }
.ph-title { font: 600 26px/1.15 var(--font-serif); letter-spacing: -.015em; margin: 6px 0 10px; }
.ph-meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; color: var(--text-3); margin-bottom: 4px; }

.seg { display: flex; gap: 2px; margin: 12px -8px 0; }
.seg-i {
  position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 11px 13px 12px; font-size: 14px; font-weight: 600; color: var(--text-2);
  background: none; border: 0; white-space: nowrap; cursor: pointer;
}
.seg-i svg { flex: none; }
.seg-i::after { content: ''; position: absolute; left: 10px; right: 10px; bottom: -1px; height: 2px; border-radius: 2px; background: transparent; }
.seg-i:hover { color: var(--text); }
.seg-i.on { color: var(--text); }
.seg-i.on::after { background: var(--accent); }
.seg-i.off { opacity: .35; pointer-events: none; }
.seg.wide { margin: 0; background: var(--bg-elev); border: 1px solid var(--line); padding: 5px; border-radius: 16px; gap: 6px; }
.seg.wide .seg-i { flex: 1; padding: 11px 14px; border-radius: 12px; text-align: center; transition: all .16s var(--ease); border: 1px solid transparent; }
.seg.wide .seg-i::after { display: none; }
.seg.wide .seg-i.on { background: var(--surface-3); color: #ffffff; border-color: var(--accent); font-weight: 700; }

.pb { flex: 1; min-height: 0; overflow-y: auto; padding: 16px 22px 20px; overscroll-behavior: contain; }
.pf { flex: none; padding: 12px 18px 14px; border-top: 1px solid var(--line); background: var(--surface); display: flex; flex-direction: column; gap: 10px; }
.foot-status { display: flex; justify-content: space-between; align-items: center; gap: 12px; font-size: 12px; color: var(--text-3); }
.foot-pips { display: flex; gap: 14px; align-items: center; color: var(--text-2); font-size: 14px; }
.foot-pips .pips { margin-left: 4px; }
.foot-actions { display: grid; grid-template-columns: auto 1fr; gap: 8px; }
.foot-actions.single { grid-template-columns: 1fr; }
.foot-actions .btn { width: 100%; }
.foot-actions:has(> .btn:only-child) { grid-template-columns: 1fr; }

.line-pills { display: flex; gap: 8px; overflow-x: auto; margin: 0 -22px; padding: 2px 22px 12px; scroll-snap-type: x proximity; }
.line-pill {
  flex: none; display: inline-flex; align-items: center; gap: 8px; max-width: 250px; padding: 6px 12px 6px 6px;
  border-radius: 99px; border: 1px solid var(--line); background: var(--surface-2); color: var(--text-2);
  font-size: 13px; font-weight: 600; scroll-snap-align: start; transition: border-color .15s, background .15s;
}
.line-pill:hover { border-color: var(--line-2); color: var(--text); }
.line-pill.on { border-color: var(--accent); background: var(--accent-soft); color: var(--text); }
.lp-n { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-3); font-size: 12px; flex: none; color: var(--text); }
.line-pill.on .lp-n { background: var(--accent); color: var(--accent-ink); }
.lp-t { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lvl { width: 7px; height: 7px; border-radius: 50%; background: var(--line-2); flex: none; }
.lvl.l1, .lvl.l2 { background: var(--info); }
.lvl.l3, .lvl.l4 { background: var(--accent); }
.lvl.l5 { background: var(--good); }

.line-head { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; margin: 2px 0 4px; }
.line-head h2 { font: 600 19px/1.25 var(--font-serif); }

.note {
  min-height: 108px; margin: 12px 0 14px; padding: 14px 16px 16px; border-radius: 14px;
  background: var(--surface-2); border: 1px solid var(--line);
}
.note.has { border-left: 3px solid var(--accent); }
.note.off { border-color: var(--info); background: color-mix(in srgb, var(--info) 8%, var(--surface-2)); }
.note-k { display: flex; align-items: center; gap: 10px; font-size: 11px; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; color: var(--text-3); }
.note-mv { font: 600 13px var(--font-mono); letter-spacing: 0; text-transform: none; color: var(--accent-text); background: var(--accent-soft); padding: 3px 9px; border-radius: 7px; }
.note p { margin-top: 8px; font-size: 15px; line-height: 1.6; }
.note p.faint { color: var(--text-3); }
.note .btn { margin-top: 10px; }
.note-end { margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--line-2); }
.note-end b { font-size: 13px; color: var(--accent-text); }
.note-end p { margin-top: 4px; font-size: 14px; color: var(--text-2); }

.movelist { display: flex; flex-direction: column; margin: 0 -6px; }
.mv-row { display: grid; grid-template-columns: 38px 1fr 1fr; align-items: center; }
.mv-row:nth-child(odd) { background: color-mix(in srgb, var(--surface-2) 55%, transparent); border-radius: 8px; }
.mv-n { font: 500 12px var(--font-mono); color: var(--text-3); text-align: right; padding-right: 10px; }
.mv {
  display: flex; align-items: center; gap: 4px; padding: 7px 10px; margin: 1px 0; border-radius: 8px; text-align: left;
  background: none; border: 0; font: 500 14.5px var(--font-mono); color: var(--text); min-height: 34px;
}
button.mv:hover { background: var(--surface-3); }
.mv.cur { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.mv.has-note::after { content: ''; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); margin-left: auto; }
.mv.cur.has-note::after { background: var(--accent-ink); }
.mv.mask { color: var(--text-3); opacity: .55; }
.mv.empty { min-height: 0; }
.fg { font-family: 'Segoe UI Symbol', 'Apple Symbols', 'Noto Sans Symbols 2', 'DejaVu Sans', sans-serif; font-size: 1.16em; line-height: 1; margin-right: 1px; }
.hint-line { display: flex; gap: 8px; align-items: center; margin-top: 16px; font-size: 12px; color: var(--text-3); flex-wrap: wrap; }

/* ideas */
.idea { margin-bottom: 22px; }
.idea h3 { font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--text-3); margin-bottom: 8px; }
.prose { font-size: 15.5px; line-height: 1.7; color: var(--text); }
blockquote { margin-top: 14px; padding: 4px 0 4px 16px; border-left: 3px solid var(--accent); font: 500 17px/1.55 var(--font-serif); color: var(--text); }
.plans { display: grid; gap: 10px; margin-bottom: 22px; }
.plan { padding: 14px 16px; border-radius: 14px; border: 1px solid var(--line); background: var(--surface-2); }
.plan h4 { display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 700; margin-bottom: 6px; }
.plan h4 span { font-size: 18px; line-height: 1; }
.plan p, .plan li { font-size: 14.5px; line-height: 1.6; color: var(--text-2); }
.plan ul { display: flex; flex-direction: column; gap: 8px; }
.plan li { padding-left: 16px; position: relative; }
.plan li::before { content: ''; position: absolute; left: 0; top: .7em; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.plan.w { border-top: 3px solid #f3eee4; }
.plan.b { border-top: 3px solid #4a443b; }
:root[data-theme="light"] .plan.b { border-top-color: #2b2720; }
.traps { counter-reset: t; display: flex; flex-direction: column; gap: 10px; }
.traps li {
  counter-increment: t; position: relative; padding: 12px 14px 12px 46px; border-radius: 12px;
  background: var(--bad-soft); font-size: 14.5px; line-height: 1.55;
}
.traps li::before {
  content: counter(t); position: absolute; left: 12px; top: 12px; width: 22px; height: 22px; border-radius: 50%;
  display: grid; place-items: center; font-size: 12px; font-weight: 700; background: var(--bad); color: #fff;
}
.link-card {
  display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-radius: 14px; margin-bottom: 22px;
  background: var(--surface-2); border: 1px solid var(--line); color: var(--text-2);
}
.link-card:hover { border-color: var(--accent); color: var(--text); }
.link-card span:nth-child(2) { flex: 1; display: flex; flex-direction: column; }
.link-card b { color: var(--text); font-size: 14px; }
.link-card em { font-style: normal; font-size: 13px; }
.lk-ic { width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent-text); }
.line-list { display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.line-row { display: flex; align-items: center; gap: 12px; padding: 11px 14px; }
.line-row + .line-row { border-top: 1px solid var(--line); }
.line-row:hover { background: var(--surface-2); }
.lr-name { flex: 1; min-width: 0; font-weight: 600; font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* game */
.game-head h2 { font: 600 20px/1.25 var(--font-serif); }
.game-head h2 i { font: 400 13px var(--font-ui); color: var(--text-3); margin: 0 4px; }
.game-sub { display: flex; align-items: center; gap: 10px; margin: 6px 0 14px; font-size: 13px; }

/* drill */
.review-bar { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; font-size: 12px; font-weight: 700; color: var(--text-3); }
.side-pick { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 12px 0 0; }
.side-btn {
  display: flex; align-items: center; justify-content: center; gap: 10px; height: 42px; border-radius: 11px;
  border: 1px solid var(--line); background: var(--surface-2); color: var(--text-2); font-weight: 600; font-size: 14px;
}
.side-btn:hover { border-color: var(--line-2); color: var(--text); }
.side-btn.on { border-color: var(--accent); background: var(--accent-soft); color: var(--text); }
.sw { width: 14px; height: 14px; border-radius: 50%; border: 1px solid var(--line-2); }
.sw.w { background: #f3eee4; } .sw.b { background: #1c1a17; border-color: #766e60; }

.drill-card { margin: 14px 0 18px; padding: 16px; border-radius: 16px; background: var(--surface-2); border: 1px solid var(--line); display: flex; flex-direction: column; gap: 12px; }
.dc-progress { display: flex; align-items: center; gap: 12px; font-size: 12px; font-weight: 700; color: var(--text-3); }
.dc-prompt { display: flex; align-items: center; gap: 10px; font-size: 16px; line-height: 1.35; }
.dc-prompt.wait { color: var(--text-3); }
.dc-feedback { padding: 11px 13px; border-radius: 11px; font-size: 14.5px; line-height: 1.55; background: var(--surface-3); color: var(--text-2); animation: rise .25s var(--ease); }
.dc-feedback b { color: var(--text); }
.dc-feedback.good { background: var(--good-soft); color: var(--text); box-shadow: inset 3px 0 0 var(--good); }
.dc-feedback.bad  { background: var(--bad-soft); color: var(--text); box-shadow: inset 3px 0 0 var(--bad); }
.dc-feedback.hint { background: var(--accent-soft); color: var(--text); box-shadow: inset 3px 0 0 var(--accent); }
.dc-feedback.idle { background: transparent; padding: 0; color: var(--text-3); font-size: 13.5px; }
.dc-actions { display: flex; gap: 8px; }

.drill-card.done { align-items: center; text-align: center; padding: 26px 18px 20px; gap: 8px; }
.drill-card.done.perfect { background: linear-gradient(180deg, var(--good-soft), var(--surface-2) 80%); border-color: color-mix(in srgb, var(--good) 40%, var(--line)); }
.drill-card.done h3 { font: 600 24px var(--font-serif); }
.drill-card.done p { color: var(--text-2); max-width: 32ch; }
.res-badge { width: 56px; height: 56px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-3); color: var(--text-2); margin-bottom: 4px; }
.perfect .res-badge, .res-badge.big { background: var(--accent); color: var(--accent-ink); animation: pop .4s var(--ease); }
.res-badge.big { width: 72px; height: 72px; margin: 0 auto 14px; }
.res-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; width: 100%; margin: 12px 0 6px; }
.res-stats > div { padding: 10px 6px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); display: flex; flex-direction: column; gap: 4px; align-items: center; }
.res-stats span { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--text-3); font-weight: 700; }
.res-stats b { font-size: 14px; }
.up { color: var(--good); font-style: normal; font-size: 11px; }
.res-actions { display: flex; gap: 8px; width: 100%; margin-top: 8px; }
.res-actions .btn { flex: 1; }

/* moments */
.moment-ctx { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.moment-ctx .chip { max-width: 60%; overflow: hidden; text-overflow: ellipsis; display: inline-block; line-height: 24px; }
.to-move { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: var(--text-2); }
.moment-q { font: 500 19px/1.5 var(--font-serif); margin-bottom: 4px; }

/* structures */
.struct-pills { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.struct-pill { padding: 6px 11px; border-radius: 99px; font-size: 12.5px; font-weight: 600; border: 1px solid var(--line); background: var(--surface-2); color: var(--text-2); }
.struct-pill:hover { color: var(--text); border-color: var(--line-2); }
.struct-pill.on { background: var(--accent-soft); border-color: var(--accent); color: var(--text); }
.struct-title { font: 600 21px/1.25 var(--font-serif); margin-bottom: 4px; }
.struct-title + .muted { font-size: 13px; margin-bottom: 12px; }

/* ── tab bar (mobile) ───────────────────────────────── */
.tabbar { display: none; }

/* ── overlays ───────────────────────────────────────── */
.overlay { position: fixed; inset: 0; z-index: 100; display: grid; place-items: start center; padding: 10vh 16px 16px; }
.scrim { position: absolute; inset: 0; background: rgba(8, 7, 6, .62); backdrop-filter: blur(3px); animation: fade .15s; }
@keyframes fade { from { opacity: 0; } }
.modal {
  position: relative; width: min(640px, 100%); max-height: 78vh; display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--line-2); border-radius: 20px; box-shadow: 0 30px 80px -20px rgba(0,0,0,.7);
  animation: rise .2s var(--ease); overflow: hidden;
}
.palette .pal-input { display: flex; align-items: center; gap: 12px; padding: 0 18px; height: 60px; border-bottom: 1px solid var(--line); color: var(--text-3); }
.pal-input input { flex: 1; background: none; border: 0; outline: 0; font-size: 17px; color: var(--text); min-width: 0; }
.pal-list { overflow-y: auto; padding: 8px; }
.pal-group { padding: 10px 12px 4px; font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--text-3); }
.pal-item { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; width: 100%; padding: 10px 12px; border: 0; border-radius: 10px; background: none; text-align: left; }
.pal-item b { font-weight: 600; font-size: 14.5px; }
.pal-item span { font-size: 12.5px; color: var(--text-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 55%; }
.pal-item.on { background: var(--accent-soft); }
.pal-empty { padding: 36px; text-align: center; color: var(--text-3); }

.settings { max-height: 84vh; }
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 14px 14px 14px 22px; border-bottom: 1px solid var(--line); }
.modal-head h2 { font: 600 20px var(--font-serif); }
.modal-body { overflow-y: auto; padding: 8px 22px 22px; }
.modal-body section { padding: 16px 0; }
.modal-body section + section { border-top: 1px solid var(--line); }
.modal-body h3 { font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--text-3); margin-bottom: 12px; }
.switch-row, .range-row, .text-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; width: 100%; padding: 10px 0; background: none; border: 0; text-align: left; }
.switch-row span, .range-row span, .text-row span { display: flex; flex-direction: column; }
.switch-row b, .range-row b, .text-row b { font-size: 14.5px; font-weight: 600; }
.switch-row em, .range-row em, .text-row em { font-style: normal; font-size: 12.5px; color: var(--text-3); }
.switch { width: 42px; height: 24px; border-radius: 99px; background: var(--surface-3); border: 1px solid var(--line-2); position: relative; flex: none; transition: background .15s; }
.switch::after { content: ''; position: absolute; top: 2px; left: 2px; width: 18px; height: 18px; border-radius: 50%; background: var(--text-2); transition: transform .18s var(--ease), background .15s; }
.switch.on { background: var(--accent); border-color: var(--accent); }
.switch.on::after { transform: translateX(18px); background: var(--accent-ink); }
.range-row input[type=range] { width: 44%; accent-color: var(--accent); }
.board-swatches { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 14px; }
.swatch { display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 8px; border-radius: 12px; background: none; border: 1px solid var(--line); }
.swatch.on { border-color: var(--accent); background: var(--accent-soft); }
.swatch em { font-style: normal; font-size: 12px; font-weight: 600; color: var(--text-2); }
.sw-board { width: 100%; aspect-ratio: 2; display: grid; grid-template-columns: 1fr 1fr; border-radius: 6px; overflow: hidden; }
.sw-board i:nth-child(1), .sw-board i:nth-child(4) { background: var(--c1); }
.sw-board i:nth-child(2), .sw-board i:nth-child(3) { background: var(--c2); }
.swatch[data-board="walnut"] { --c1: #ecd9b5; --c2: #ae7c52; }
.swatch[data-board="green"]  { --c1: #eeeed2; --c2: #769656; }
.swatch[data-board="blue"]   { --c1: #dee3e6; --c2: #8ca2ad; }
.swatch[data-board="ash"]    { --c1: #dfe1e5; --c2: #7b8492; }
.row-btns { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.kbd-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 16px; font-size: 13px; color: var(--text-2); }
.kbd-grid kbd { margin-right: 4px; }

.toasts { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 120; display: flex; flex-direction: column; gap: 8px; align-items: center; pointer-events: none; }
.toast {
  display: flex; align-items: center; gap: 10px; padding: 11px 16px; border-radius: 12px; font-size: 14px; font-weight: 600;
  background: var(--text); color: var(--bg); box-shadow: 0 14px 32px rgba(0,0,0,.35);
  opacity: 0; transform: translateY(10px); transition: opacity .25s, transform .25s var(--ease);
}
.toast.in { opacity: 1; transform: none; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1280px) {
  .search-trigger { min-width: 0; width: 36px; height: 36px; padding: 0; justify-content: center; flex-shrink: 0; }
  .search-trigger span, .search-trigger kbd { display: none; }
  .topnav a { padding: 0 10px; font-size: 13px; }
}

@media (max-width: 1180px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat-ring { grid-column: span 2; }
  .parts, .cards3 { grid-template-columns: repeat(2, 1fr); }
  .train-grid { grid-template-columns: 1fr 1fr; }
  .tcard.main { grid-column: span 2; }
}

@media (max-width: 980px) {
  body.in-ws { overflow: auto; }
  .brand-text small { display: none; }
  .hero { grid-template-columns: 1fr; padding: 28px; gap: 28px; }
  .hero-board { max-width: 300px; }

  .ws { display: block; height: auto; padding: 0 0 32px; }
  .ws-stage { position: relative; padding: 8px 12px 6px; background: var(--bg); }
  .board-block { --bs: min(100%, calc(100dvh - var(--hh) - 185px), 540px); margin: 0 auto; }
  .ws-panel { border-radius: 20px 20px 0 0; border-width: 1px 0 0; box-shadow: none; overflow: visible; }
  .pb { overflow: visible; }
  .pf { position: sticky; bottom: 0; z-index: 15; background: var(--surface); }
}

@media (max-width: 860px) {
  :root { --hh: 54px; }
  body { padding-bottom: calc(72px + env(safe-area-inset-bottom, 0px)); }
  .ws { padding-bottom: calc(88px + env(safe-area-inset-bottom, 0px)); }
  .pf { bottom: calc(62px + env(safe-area-inset-bottom, 0px)); }
  .topbar { padding: 0 12px; gap: 8px; }
  .topnav { display: none; }
  .top-actions { gap: 5px; }
  .icon-btn,
  .search-trigger { width: 34px; height: 34px; }
  .streak { height: 34px; padding: 0 8px; font-size: 12.5px; }

  .tabbar {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 60;
    display: grid; grid-template-columns: repeat(6, minmax(0, 1fr));
    align-items: center; gap: 2px;
    padding: 6px 6px calc(6px + env(safe-area-inset-bottom, 0px));
    background: var(--bg-2);
    border-top: 1px solid var(--line);
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.32);
  }
  .tabbar a {
    position: relative;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 3px; height: 50px; padding: 4px 2px; min-width: 0;
    color: var(--text-3); border-radius: 12px; text-align: center;
    transition: color .14s var(--ease), background .14s var(--ease);
  }
  .tabbar a [data-ic] {
    width: 22px; height: 22px;
    display: inline-flex; align-items: center; justify-content: center;
    flex-shrink: 0; line-height: 0;
  }
  .tabbar a [data-ic] svg { width: 20px; height: 20px; display: block; }
  .tabbar a.active { color: var(--accent-text); background: var(--surface); }
  .tabbar em {
    display: block; width: 100%;
    font-style: normal; font-size: 10px; line-height: 1.15; font-weight: 600;
    text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  }
  .tabbar .badge { position: absolute; top: 3px; left: calc(50% + 5px); margin: 0; }
  .toasts { bottom: 84px; }
}

@media (max-width: 720px) {
  .page { padding: 16px 12px 60px; }
  .page-head { flex-direction: column; align-items: flex-start; gap: 12px; margin-bottom: 18px; }
  .page-head-stat { text-align: left; }
  .hero { padding: 20px 18px; border-radius: 22px; }
  .hero-actions .btn { width: 100%; }
  .stats { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat { padding: 14px; }
  .stat-v { font-size: 28px; }
  .stat-streak { grid-column: span 2; }
  .parts, .cards3, .train-grid { grid-template-columns: 1fr; }
  .tcard.main { grid-column: auto; }
  .lib-grid, .game-grid, .curriculum-grid, .pillars-grid, .tier-items-grid { grid-template-columns: 1fr; }
  .sum-stats { grid-template-columns: 1fr 1fr; gap: 18px; }
  .sum-card { padding: 28px 18px; }
  .ph { padding: 14px 14px 0; }
  .ph-title { font-size: 20px; }
  .pb { padding: 12px 14px 18px; }
  .pf { padding: 10px 14px; }
  .line-pills { margin: 0 -14px; padding: 2px 14px 10px; }
  .ws-stage { padding: 6px 10px 4px; }
  .board-block { --bs: min(100%, calc(100dvh - var(--hh) - 175px), 480px); }
  .pstrip { height: 28px; font-size: 12.5px; }
  .controls {
    width: 100%; max-width: 100%;
    height: 48px; gap: 4px; padding: 4px 0 0;
  }
  .cbtn {
    flex: 1 1 0; min-width: 0; max-width: 48px; width: auto;
    height: 40px; border-radius: 10px;
  }
  .cbtn.play {
    flex: 1.35 1 0; max-width: 64px; width: auto;
  }
  .csep { margin: 0 2px; height: 20px; }
  .overlay { padding: 5vh 10px 10px; }
  .board-swatches { grid-template-columns: repeat(2, 1fr); }
  .kbd-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .topbar { padding: 0 10px; gap: 6px; }
  .brand { gap: 7px; }
  .brand-mark { width: 28px; height: 28px; border-radius: 8px; }
  .brand-text b { font-size: 14px; }
  .top-actions { gap: 4px; }
}

/* ==========================================================================
   New Domains: Pillars, Middlegame, Endgame, Tactics & Live Analysis
   ========================================================================== */
.pillars-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 14px;
}
.pillar-card {
  display: flex; gap: 16px; padding: 18px 20px; border-radius: var(--r-lg);
  background: var(--surface); border: 1px solid var(--line); text-decoration: none; color: inherit;
  transition: border-color .15s, transform .15s var(--ease), box-shadow .15s;
}
.pillar-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); }
.pillar-ic {
  flex: none; width: 48px; height: 48px; border-radius: 13px; display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent-text);
}
.pillar-body { display: flex; flex-direction: column; gap: 4px; flex: 1; min-width: 0; }
.pillar-body b { font-size: 16px; font-weight: 600; color: var(--text); }
.pillar-body p { font-size: 13px; color: var(--text-2); line-height: 1.45; margin: 0; }
.pillar-body .bar { margin-top: 8px; }

.curriculum-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px;
}
.curr-card {
  display: flex; gap: 16px; padding: 16px; border-radius: var(--r-lg);
  background: var(--surface); border: 1px solid var(--line); text-decoration: none; color: inherit;
  transition: border-color .15s, transform .15s var(--ease); position: relative;
}
.curr-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.curr-card.done { border-color: color-mix(in srgb, var(--good) 40%, var(--line)); }
.curr-thumb { flex: none; width: 84px; height: 84px; border-radius: 14px; overflow: hidden; border: 1px solid var(--line); }
.curr-thumb .mb, .curr-thumb .mini { width: 100% !important; height: 100% !important; border-radius: 0; }
.curr-body { display: flex; flex-direction: column; gap: 4px; flex: 1; min-width: 0; }
.curr-tags { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; margin-bottom: 2px; }
.chip-phase {
  font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em;
  padding: 3px 9px; border-radius: 999px; background: var(--surface-3); color: var(--text-2);
}
.chip-phase.Opening { background: rgba(224,176,74,.18); color: var(--accent-text); }
.chip-phase.Middlegame { background: rgba(127,176,234,.18); color: var(--info); }
.chip-phase.Endgame { background: rgba(124,196,138,.18); color: var(--good); }
.chip-diff {
  font-size: 10.5px; font-weight: 600; padding: 3px 9px; border-radius: 999px;
  background: var(--surface-2); color: var(--text-3);
}
.curr-body h3 { font-size: 15px; font-weight: 600; line-height: 1.3; color: var(--text); margin: 0; }
.curr-body p { font-size: 12.5px; color: var(--text-2); line-height: 1.4; margin: 0; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }

/* Analysis Engine evaluation bar & tools */
.eval-widget {
  margin: 12px 0 16px; padding: 14px 16px; border-radius: 14px;
  background: var(--surface-2); border: 1px solid var(--line); display: flex; flex-direction: column; gap: 10px;
}
.eval-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.eval-badge {
  font: 700 15px var(--font-mono); padding: 4px 10px; border-radius: 8px;
  background: var(--surface-3); color: var(--text); display: inline-flex; align-items: center; gap: 6px;
}
.eval-badge.white { color: var(--good); background: var(--good-soft); }
.eval-badge.black { color: var(--bad); background: var(--bad-soft); }
.eval-bar-wrapper {
  height: 10px; border-radius: 99px; background: #222; overflow: hidden; display: flex; width: 100%; border: 1px solid var(--line-2);
}
.eval-bar-white { background: #f3eee5; height: 100%; transition: width .25s var(--ease); }
.eval-bar-black { background: #333; height: 100%; flex: 1; }
.eval-stat-text { font-size: 12px; color: var(--text-2); display: flex; justify-content: space-between; font-family: var(--font-mono); }
.eval-best { font-size: 13px; color: var(--accent-text); background: var(--accent-soft); padding: 4px 8px; border-radius: 6px; }

.fen-box {
  display: flex; gap: 8px; align-items: center; margin-top: 10px;
}
.fen-input {
  flex: 1; min-width: 0; padding: 8px 12px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--surface); color: var(--text); font: 500 12px var(--font-mono);
}

/* ───────────── Stockfish Engine & Lichess UI ───────────── */
.engine-ctrl-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 8px 12px; background: var(--surface-3); border-radius: var(--r-sm);
  font-size: 12px; margin-bottom: 10px; border: 1px solid var(--line-2);
}
.engine-ctrl-left { display: flex; align-items: center; gap: 10px; }
.engine-pulse {
  width: 9px; height: 9px; border-radius: 50%; background: var(--good);
  box-shadow: 0 0 8px var(--good); display: inline-block;
  animation: engPulse 1.6s ease-in-out infinite;
}
.engine-pulse.idle { background: var(--text-3); box-shadow: none; animation: none; }
@keyframes engPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.85); }
}
.engine-stats {
  display: flex; align-items: center; gap: 8px; font-size: 11.5px; color: var(--text-2); font-family: var(--font-mono);
}
.engine-select {
  background: var(--surface); color: var(--text); border: 1px solid var(--line);
  padding: 4px 8px; border-radius: 6px; font-size: 11.5px; font-family: var(--font-sans);
}

.pv-box {
  display: flex; flex-direction: column; gap: 4px; margin-top: 6px;
}
.pv-header {
  display: flex; justify-content: space-between; align-items: center; font-size: 11.5px; color: var(--text-3);
}
.pv-line {
  font-size: 12px; color: var(--text-2); font-family: var(--font-mono);
  background: var(--surface); padding: 7px 10px; border-radius: 6px;
  border: 1px solid var(--line-2); overflow-x: auto; white-space: nowrap; line-height: 1.4;
}
.pv-num { color: var(--text-3); font-weight: 500; }
.pv-move-btn {
  display: inline-flex; align-items: center; padding: 1px 6px; border-radius: 5px;
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  color: var(--accent-text); font: 700 12px var(--font-mono); cursor: pointer;
  transition: background .12s, border-color .12s;
}
.pv-move-btn:hover { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

/* Database Explorer Tabs */
.db-tabs {
  display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin: 16px 0 10px;
}
.db-tab-btn {
  padding: 6px 12px; border-radius: 6px 6px 0 0; background: none; border: none;
  font: 600 12px var(--font-sans); color: var(--text-3); cursor: pointer; transition: all .15s;
}
.db-tab-btn:hover { color: var(--text); }
.db-tab-btn.on { color: var(--accent-text); background: var(--surface-2); border-bottom: 2px solid var(--accent); }

.db-panel { padding: 4px 0; }
.db-notice {
  font-size: 12px; color: var(--text-2); background: var(--surface-2);
  padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line); line-height: 1.4; margin: 8px 0;
}
.db-notice b { color: var(--text); }
.db-notice a { color: var(--accent-text); text-decoration: underline; }

.explorer-table { width: 100%; border-collapse: collapse; font-size: 12px; margin-top: 4px; }
.explorer-table tr { cursor: pointer; border-radius: 6px; transition: background .12s; }
.explorer-table tr:hover { background: var(--surface-2); }
.explorer-table td, .explorer-table th { padding: 6px 8px; text-align: left; vertical-align: middle; }
.explorer-san { font-weight: 700; font-family: var(--font-mono); color: var(--text); }
.explorer-count { color: var(--text-3); font-size: 11px; white-space: nowrap; }

.ratio-bar {
  display: flex; height: 16px; border-radius: 4px; overflow: hidden; font-size: 9.5px;
  font-weight: 700; line-height: 16px; text-align: center; min-width: 100px;
}
.ratio-white { background: #f0ece1; color: #111; overflow: hidden; }
.ratio-draw { background: #7a7a7a; color: #fff; overflow: hidden; }
.ratio-black { background: #262421; color: #eee; overflow: hidden; }

.game-item {
  display: flex; align-items: center; justify-content: space-between; padding: 6px 8px;
  border-bottom: 1px solid var(--line-2); font-size: 12px; text-decoration: none; color: inherit;
}
.game-item:hover { background: var(--surface-2); }
.game-players { display: flex; flex-direction: column; gap: 2px; }
.game-res { font-weight: 700; font-family: var(--font-mono); font-size: 12px; }

/* Tablebase Styles */
.tb-verdict-card {
  padding: 12px; border-radius: 8px; background: var(--surface-2); border: 1px solid var(--line);
  margin-bottom: 10px; display: flex; align-items: center; justify-content: space-between;
}
.tb-title { font-size: 13px; font-weight: 700; color: var(--text); }
.tb-badge {
  display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px;
  border-radius: 6px; font-weight: 700; font-size: 12px;
}
.tb-badge.win { background: var(--good-soft); color: var(--good); }
.tb-badge.draw { background: var(--surface-3); color: var(--text-2); }
.tb-badge.loss { background: var(--bad-soft); color: var(--bad); }

.tb-list { display: flex; flex-direction: column; gap: 4px; }
.tb-move-row {
  display: flex; align-items: center; justify-content: space-between; padding: 7px 10px;
  border-radius: 6px; cursor: pointer; transition: background .12s; background: var(--surface);
  border: 1px solid var(--line-2);
}
.tb-move-row:hover { background: var(--surface-2); border-color: var(--accent); }
.tb-move-san { font-weight: 700; font-family: var(--font-mono); font-size: 13px; }
.tb-move-tag { font-size: 11px; padding: 2px 6px; border-radius: 4px; font-weight: 600; }
.tb-move-tag.best { background: var(--good-soft); color: var(--good); }
.tb-move-tag.good { background: var(--surface-3); color: var(--text-2); }
.tb-move-tag.bad { background: var(--bad-soft); color: var(--bad); }

/* Daily puzzle promo */
.daily-puzzle-banner {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px 22px; border-radius: 24px; background: var(--surface);
  border: 1px solid var(--line); margin-bottom: 20px; box-shadow: var(--shadow-sm);
}
.daily-copy h3 { margin: 0 0 4px; font-size: 16px; font-weight: 700; color: var(--text); }
.daily-copy p { margin: 0; font-size: 12.5px; color: var(--text-2); }

/* ───────────── Play vs Computer & Pass & Play ───────────── */
.play-setup-card {
  max-width: 680px; margin: 18px auto 32px; background: var(--surface); border: 1px solid var(--line);
  border-radius: 28px; padding: 30px 32px; display: flex; flex-direction: column; gap: 24px;
  box-shadow: var(--shadow-sm);
}
.setup-group { display: flex; flex-direction: column; gap: 11px; }
.setup-group-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.setup-group-title { font-size: 11.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .09em; color: var(--text-3); }
.setup-group-sub { font-size: 12.5px; color: var(--text-2); }
.setup-group-sub b { color: var(--accent-text); font-weight: 700; }

.bots-grid {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px;
}
.bot-chip {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 7px; padding: 14px 8px;
  border-radius: 18px; background: var(--bg-elev); border: 2px solid var(--line); cursor: pointer;
  transition: all .16s var(--ease); text-align: center;
}
.bot-chip:hover { border-color: var(--line-2); transform: translateY(-2px); background: var(--surface-2); }
.bot-chip.on {
  border-color: var(--accent); background: var(--surface-2);
}
.bot-avatar {
  width: 44px; height: 44px; border-radius: 14px; display: grid; place-items: center;
  background: var(--surface-3); border: 1px solid var(--line-2); font-size: 24px; line-height: 1;
}
.bot-chip.on .bot-avatar { background: var(--accent-soft); border-color: var(--accent); }
.bot-name { font-size: 12.5px; font-weight: 700; color: var(--text); white-space: nowrap; }
.bot-elo {
  font-size: 10.5px; font-weight: 700; color: var(--accent-text); font-family: var(--font-mono);
  padding: 2px 8px; border-radius: 999px; background: var(--surface-3);
}
.bot-chip.on .bot-elo { background: var(--accent); color: #ffffff; }

.tc-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px;
}
.tc-btn {
  padding: 11px 14px; border-radius: 14px; background: var(--bg-elev); border: 2px solid var(--line);
  font: 600 13px var(--font-sans); color: var(--text-2); cursor: pointer; text-align: center;
  transition: all .16s var(--ease);
}
.tc-btn:hover { border-color: var(--line-2); color: var(--text); background: var(--surface-2); }
.tc-btn.on {
  background: var(--accent); color: #ffffff; border-color: var(--accent); font-weight: 700;
  box-shadow: 0 3px 0 var(--accent-shadow);
}

.side-picker { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.side-opt {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 14px; border-radius: 16px; background: var(--bg-elev); border: 2px solid var(--line);
  cursor: pointer; font-weight: 600; font-size: 13.5px; color: var(--text-2); transition: all .16s var(--ease);
}
.side-opt:hover { border-color: var(--line-2); color: var(--text); background: var(--surface-2); }
.side-opt.on {
  border-color: var(--accent); background: var(--surface-2); color: var(--text); font-weight: 700;
}

.play-setup-footer {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding-top: 18px; border-top: 1px solid var(--line); margin-top: 2px; flex-wrap: wrap;
}
.play-matchup-pill {
  display: flex; flex-direction: column; gap: 2px;
}
.play-matchup-label {
  font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--text-3);
}
.play-matchup-val {
  font-size: 13.5px; font-weight: 600; color: var(--text);
}
.play-start-btn {
  border-radius: 999px !important; padding: 13px 28px !important; font-size: 14.5px !important;
  box-shadow: 0 3px 0 var(--accent-shadow) !important;
}
@media (max-width: 640px) {
  .play-setup-card { padding: 20px; border-radius: 22px; }
  .bots-grid { grid-template-columns: repeat(auto-fit, minmax(95px, 1fr)); }
  .tc-grid { grid-template-columns: repeat(2, 1fr); }
  .play-setup-footer { flex-direction: column; align-items: stretch; }
  .play-start-btn { width: 100%; justify-content: center; }
}

/* Play HUD inside Workspace */
.play-player-strip {
  display: flex; align-items: center; justify-content: space-between; padding: 10px 14px;
  background: var(--surface-2); border-radius: var(--r-sm); margin: 6px 0; border: 1px solid var(--line-2);
}
.play-player-info { display: flex; align-items: center; gap: 10px; }
.play-player-avatar { font-size: 20px; line-height: 1; }
.play-player-name { font-size: 13.5px; font-weight: 700; color: var(--text); display: flex; align-items: center; gap: 6px; }
.play-player-status { font-size: 11px; color: var(--accent-text); font-style: italic; }

.chess-clock {
  font: 700 18px var(--font-mono); padding: 5px 12px; border-radius: 6px;
  background: #111; color: #eee; border: 1px solid var(--line); letter-spacing: .05em;
  transition: all .15s;
}
.chess-clock.active {
  background: #252219; color: var(--accent); border-color: var(--accent);
  box-shadow: 0 0 10px rgba(224,176,74,.25);
}
.chess-clock.danger {
  background: #2d1314; color: var(--bad); border-color: var(--bad);
  animation: engPulse 1s infinite;
}

.mat-diff {
  font: 700 11px var(--font-mono); padding: 1px 6px; border-radius: 4px;
  background: var(--surface-3); color: var(--text-2); margin-left: 6px;
}

.play-action-bar {
  display: flex; gap: 8px; margin: 10px 0 14px; flex-wrap: wrap;
}

/* PGN Studio */
.pgn-studio { max-width: 960px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
.pgn-input-box {
  width: 100%; min-height: 140px; padding: 12px; border-radius: var(--r-sm);
  background: var(--surface); color: var(--text); border: 1px solid var(--line);
  font: 500 12.5px var(--font-mono); line-height: 1.5; resize: vertical;
}
.sample-games-row {
  display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin: 8px 0;
}
.pgn-meta-banner {
  padding: 14px 18px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
}
.pgn-meta-names { font-size: 16px; font-weight: 700; color: var(--text); }
.pgn-meta-sub { font-size: 12px; color: var(--text-3); margin-top: 2px; }

/* ── Chess.com-Style On-Board Move Badges, Callout Pill & Blindfold Mode ── */
.cb-badges {
  position: absolute; inset: 0; pointer-events: none; z-index: 25;
}
.cb-badge-cell {
  position: absolute; top: 0; left: 0; width: 12.5%; height: 12.5%;
  pointer-events: none;
}
.cb-badge-sq-ring {
  position: absolute; inset: 0;
  box-shadow: inset 0 0 0 3.5px var(--cls-color, #81b64c);
  background: color-mix(in srgb, var(--cls-color, #81b64c) 24%, transparent);
  pointer-events: none;
}
.cb-move-badge {
  position: absolute; top: -6px; right: -6px; z-index: 3;
  min-width: 26px; height: 26px; padding: 0 5px;
  border-radius: 999px;
  display: inline-flex; align-items: center; justify-content: center;
  font: 800 12px/1 var(--font-sans); color: #ffffff;
  border: 2.5px solid #21201d;
  box-shadow: 0 3px 8px rgba(0, 0, 0, .6);
  animation: badgePop .24s cubic-bezier(.18, 1.35, .4, 1) both;
  letter-spacing: -.02em;
}
.cb-move-badge.edge-top { top: 2px; }
.cb-move-badge.edge-right { right: 2px; }
.cb-move-badge.cls-inaccuracy { color: #1a1712; }

.cb-move-callout {
  position: absolute; z-index: 4;
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3.5px 10px 3.5px 5px;
  border-radius: 999px;
  background: #1b1a17;
  border: 2px solid var(--cls-color, #81b64c);
  color: #ffffff;
  font: 700 11.5px/1.1 var(--font-sans);
  white-space: nowrap;
  box-shadow: 0 6px 16px rgba(0, 0, 0, .65);
  animation: calloutPop .22s cubic-bezier(.18, 1.25, .4, 1) both;
  pointer-events: none;
}
.cb-move-callout::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  border-width: 6px 6px 0 6px;
  border-style: solid;
  border-color: var(--cls-color, #81b64c) transparent transparent transparent;
}
.cb-move-callout.align-left::after { left: 22px; transform: none; }
.cb-move-callout.align-right::after { left: auto; right: 22px; transform: none; }
.cb-move-callout.pos-top { bottom: calc(100% - 2px); }
.cb-move-callout.pos-top-edge { top: -22px; }
.cb-move-callout.pos-bottom { top: calc(100% + 6px); }
.cb-move-callout.align-center { left: 50%; transform: translateX(-50%); }
.cb-move-callout.align-left { left: -2px; }
.cb-move-callout.align-right { right: -2px; }
.cb-mc-sym {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 18px; height: 18px; padding: 0 4px;
  border-radius: 999px;
  background: var(--cls-color, #81b64c);
  color: #ffffff; font: 800 10.5px/1 var(--font-sans);
}
.cb-move-callout.cls-inaccuracy .cb-mc-sym { color: #1a1712; }
.cb-mc-lbl { letter-spacing: -.01em; }

@keyframes badgePop {
  0% { transform: scale(.3) rotate(-14deg); opacity: 0; }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}
@keyframes calloutPop {
  0% { opacity: 0; filter: brightness(1.2); }
  100% { opacity: 1; filter: none; }
}
.cb.cb-semi-blindfold .pc svg {
  opacity: .16; filter: grayscale(1) contrast(.5);
}
.cb.cb-full-blindfold .pc svg {
  opacity: 0;
}

/* ── Move Classification Chips & Game Review Studio ────────── */
.cls-tag {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 18px; height: 16px; padding: 0 5px; margin-left: 4px;
  border-radius: 4px; font: 700 10px/1 var(--font-sans); color: #fff;
  vertical-align: middle;
}
.cls-brilliant  { background: #1baca6; }
.cls-great      { background: #5c8bb0; }
.cls-best       { background: #81b64c; }
.cls-excellent  { background: #96bc4b; }
.cls-good       { background: #7c9d61; }
.cls-book       { background: #a88865; }
.cls-inaccuracy { background: #f7c631; color: #1a1712; }
.cls-mistake    { background: #e6912c; }
.cls-miss       { background: #e06c4f; }
.cls-blunder    { background: #ca3431; }

.review-report-card {
  margin: 10px 0 12px; padding: 14px; border-radius: 10px;
  background: var(--surface-2); border: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 12px;
}
.review-acc-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px;
}
.review-acc-col {
  padding: 10px 12px; border-radius: 8px; background: var(--surface);
  border: 1px solid var(--line); display: flex; flex-direction: column; gap: 2px;
}
.review-acc-val {
  font: 700 22px/1.15 var(--font-mono); color: var(--text);
}
.review-elo-pill {
  font-size: 11px; color: var(--text-3); font-family: var(--font-mono);
}
.review-elo-pill b { color: var(--accent-text); }

.eval-graph-wrap {
  position: relative; height: 56px; border-radius: 6px; overflow: hidden;
  background: var(--surface); border: 1px solid var(--line);
}
.eval-graph-wrap svg { width: 100%; height: 100%; display: block; }

.cls-counts-table {
  display: flex; flex-direction: column; gap: 4px; padding-top: 4px;
}
.cls-count-row {
  display: grid; grid-template-columns: 32px 1fr 32px; align-items: center;
  font-size: 12px; padding: 3px 4px; border-radius: 5px;
}
.cls-count-row:nth-child(odd) { background: rgba(255,255,255,.015); }
.cls-count-row .w-val, .cls-count-row .b-val {
  font: 600 12px var(--font-mono); text-align: center;
}
.cls-count-row .cls-label {
  display: flex; align-items: center; justify-content: center; gap: 6px;
  color: var(--text-2); font-weight: 500;
}

.coach-verdict-box {
  padding: 10px 12px; border-radius: 8px; background: var(--surface-2);
  border: 1px solid var(--line); border-left: 3px solid var(--accent);
  margin: 8px 0;
}
.coach-verdict-head {
  display: flex; align-items: center; gap: 8px; margin-bottom: 4px; font-size: 12.5px;
}

/* ── Minimalist Academy Hub & 5-Pillar Skill Radar ─────────── */
.academy-page {
  display: flex; flex-direction: column; gap: 24px;
}
.academy-hero {
  display: grid; grid-template-columns: 1fr 240px; gap: 28px;
  padding: 28px; border-radius: var(--r-lg);
  background: var(--surface); border: 1px solid var(--line);
  align-items: center;
}
@media (max-width: 900px) {
  .academy-hero { grid-template-columns: 1fr; }
}
.academy-title-badge, .title-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px; border-radius: 6px;
  background: var(--surface-2); border: 1px solid var(--line-2);
  color: var(--accent-text); font: 600 11.5px/1.2 var(--font-mono);
  margin-bottom: 10px; text-transform: uppercase; letter-spacing: .04em;
}
.study-plan-row {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px;
  margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--line);
}
@media (max-width: 760px) {
  .study-plan-row { grid-template-columns: 1fr; }
}
.study-plan-card {
  display: flex; flex-direction: column; gap: 3px;
  padding: 12px 14px; border-radius: 8px;
  background: var(--surface-2); border: 1px solid var(--line);
  transition: border-color .14s, background .14s;
}
.study-plan-card:hover {
  border-color: var(--accent); background: var(--surface-3);
}
.study-plan-card .sp-k {
  font-size: 10.5px; font-weight: 600; text-transform: uppercase;
  letter-spacing: .06em; color: var(--text-3);
}
.study-plan-card b {
  font-size: 13.5px; font-weight: 600; color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.radar-card {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 16px 12px; border-radius: 10px;
  background: var(--surface-2); border: 1px solid var(--line);
}

.pillar-tabs {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px;
}
@media (max-width: 820px) {
  .pillar-tabs { grid-template-columns: repeat(2, 1fr); }
}
.pillar-tab {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 11px 14px; border-radius: 8px;
  background: var(--surface); border: 1px solid var(--line);
  cursor: pointer; text-align: left; font-size: 13px; font-weight: 500;
  color: var(--text-2); transition: border-color .14s, background .14s, color .14s;
}
.pillar-tab:hover {
  border-color: var(--line-2); color: var(--text); background: var(--surface-2);
}
.pillar-tab.active, .pillar-tab.on {
  border-color: var(--accent); background: var(--surface-2); color: var(--text); font-weight: 600;
}
.pillar-tab .p-elo {
  font: 600 11.5px var(--font-mono); color: var(--text-3);
  padding: 2px 6px; border-radius: 4px; background: var(--surface-3);
}
.pillar-tab.active .p-elo {
  color: var(--accent-text); background: var(--accent-soft);
}

.tier-timeline {
  display: flex; flex-direction: column; gap: 14px;
}
.tier-card {
  padding: 18px 20px; border-radius: 10px;
  background: var(--surface); border: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 12px;
}
.tier-card-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; padding-bottom: 10px; border-bottom: 1px solid var(--line);
}
.tier-card-title {
  display: flex; align-items: center; gap: 10px;
}
.tier-card-title h3 {
  font-size: 15px; font-weight: 600; color: var(--text); margin: 0;
}
.tier-items-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 8px;
}
.tier-item-link {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 13px; border-radius: 8px;
  background: var(--surface-2); border: 1px solid var(--line);
  transition: border-color .14s, background .14s;
}
.tier-item-link:hover {
  border-color: var(--line-2); background: var(--surface-3);
}
.tier-item-link.done {
  border-color: color-mix(in srgb, var(--good) 40%, var(--line));
}
.tier-item-link > div {
  display: flex; flex-direction: column; gap: 2px; min-width: 0;
}
.tier-item-link .ti-type {
  font-size: 10.5px; color: var(--text-3); font-weight: 500;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.tier-item-link b {
  font-size: 13px; font-weight: 500; color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

/* ── Coordinate Speed Drill HUD ────────────────────────────── */
.coord-target-banner {
  padding: 20px; border-radius: 10px; background: var(--surface-2);
  border: 1px solid var(--line); margin-bottom: 12px; text-align: center;
}
.coord-target-sq {
  font: 700 44px/1.1 var(--font-mono); color: var(--accent-text);
  letter-spacing: -.02em; margin: 6px 0;
}

/* ── Topbar User Chip & Authentication Page ────────────────── */
.user-chip {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  height: 36px; padding: 0 12px; border-radius: 999px; flex-shrink: 0;
  border: 1px solid var(--line); background: var(--surface);
  color: var(--text-dim); font-size: 12.5px; font-weight: 600; line-height: 1;
  transition: all .15s var(--ease); text-decoration: none; white-space: nowrap;
}
.user-chip:hover { color: var(--text); border-color: var(--line-2); background: var(--surface-2); }
.user-chip.active { border-color: var(--accent); color: var(--text); background: var(--accent-soft); }
.user-chip.logged-in { padding-left: 6px; padding-right: 10px; }
.user-chip svg { width: 15px; height: 15px; color: var(--text-dim); flex-shrink: 0; }
.uc-av {
  width: 24px; height: 24px; border-radius: 50%; flex-shrink: 0;
  background: var(--accent-soft); border: 1px solid var(--accent);
  color: var(--accent-text); display: inline-flex; align-items: center; justify-content: center;
  font-size: 13px; line-height: 1;
}
.uc-name { color: var(--text); font-weight: 600; max-width: 110px; overflow: hidden; text-overflow: ellipsis; }
.uc-elo {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  color: var(--accent-text); background: var(--surface-2);
  padding: 2px 6px; border-radius: 99px; border: 1px solid var(--line);
}

.auth-page { max-width: 1080px; margin: 0 auto; padding: 8px 0 40px; }
.auth-split {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 28px; align-items: start;
}
@media (max-width: 860px) {
  .auth-split { grid-template-columns: 1fr; }
  .user-chip { height: 34px; padding: 0 10px; }
  .uc-elo { display: none; }
}
@media (max-width: 520px) {
  .user-chip { width: 34px; height: 34px; padding: 0; justify-content: center; }
  .user-chip.logged-in { padding: 0; }
  .user-chip > span:not(.uc-av),
  .uc-name { display: none; }
}

.auth-showcase {
  display: flex; flex-direction: column; gap: 22px; padding: 8px 4px;
}
.auth-brand-pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 4px 12px 4px 6px; border-radius: 99px;
  background: var(--surface); border: 1px solid var(--line);
  font-size: 12px; font-weight: 600; color: var(--text-dim); margin-bottom: 14px;
}
.auth-brand-pill .brand-mark { width: 22px; height: 22px; border-radius: 6px; }
.auth-showcase-top h1 {
  font-size: clamp(26px, 3.2vw, 34px); font-weight: 700;
  letter-spacing: -.025em; line-height: 1.15; margin-bottom: 10px; color: var(--text);
}
.auth-showcase-top .lede {
  font-size: 14px; line-height: 1.6; color: var(--text-dim); max-width: 52ch;
}

.auth-features { display: flex; flex-direction: column; gap: 12px; }
.auth-feat {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 13px 15px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line);
}
.af-ic {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--accent-soft); color: var(--accent-text);
  display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.auth-feat b { display: block; font-size: 13.5px; color: var(--text); margin-bottom: 2px; }
.auth-feat p { font-size: 12.5px; color: var(--text-dim); line-height: 1.45; margin: 0; }

.auth-guest-banner {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 12px 14px; border-radius: var(--radius);
  background: var(--good-soft); border: 1px solid rgba(16, 185, 129, 0.35);
  color: var(--text); font-size: 12.5px;
}
.auth-guest-banner > span { color: var(--good); margin-top: 2px; }
.auth-guest-banner b { display: block; color: var(--good); margin-bottom: 2px; }
.auth-guest-banner p { margin: 0; color: var(--text-dim); }

.auth-demo-section {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 14px;
}
.auth-demo-label {
  display: block; font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-faint); margin-bottom: 10px;
}
.auth-demo-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (max-width: 520px) { .auth-demo-grid { grid-template-columns: 1fr; } }
.auth-demo-btn {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px;
  border-radius: 9px; border: 1px solid var(--line); background: var(--bg-elev);
  text-align: left; transition: all .15s var(--ease); cursor: pointer;
}
.auth-demo-btn:hover { border-color: var(--accent); background: var(--surface-2); transform: translateY(-1px); }
.ad-av {
  width: 34px; height: 34px; border-radius: 9px; background: var(--accent-soft);
  color: var(--accent-text); display: inline-flex; align-items: center; justify-content: center;
  font-size: 18px; flex-shrink: 0;
}
.auth-demo-btn b { display: block; font-size: 12.5px; color: var(--text); }
.auth-demo-btn small { display: block; font-size: 11px; color: var(--text-dim); font-family: var(--font-mono); }

.auth-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 26px; box-shadow: var(--shadow);
}
.auth-tabs { margin-bottom: 20px; }
.auth-form-head { margin-bottom: 18px; }
.auth-form-head h2 { font-size: 20px; font-weight: 700; letter-spacing: -.015em; margin-bottom: 4px; }
.auth-form-head p { font-size: 13px; color: var(--text-dim); margin: 0; }

.auth-alert {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 12px; border-radius: 8px; font-size: 12.5px; font-weight: 500;
  margin-bottom: 16px; border: 1px solid var(--line);
}
.auth-alert.bad { background: var(--bad-soft); border-color: rgba(244, 63, 94, 0.35); color: var(--bad); }
.auth-alert.good { background: var(--good-soft); border-color: rgba(16, 185, 129, 0.35); color: var(--good); }

.auth-form { display: flex; flex-direction: column; gap: 14px; }
.auth-field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 560px) { .auth-field-row { grid-template-columns: 1fr; } }
.auth-field { display: flex; flex-direction: column; gap: 6px; }
.auth-field > span { font-size: 12px; font-weight: 600; color: var(--text-dim); }
.auth-field > input, .auth-select {
  width: 100%; height: 38px; padding: 0 12px;
  border-radius: 8px; border: 1px solid var(--line-2);
  background: var(--bg-elev); color: var(--text); font-size: 13.5px;
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
}
.auth-input-wrap {
  position: relative; display: flex; align-items: center;
}
.auth-input-wrap > svg {
  position: absolute; left: 11px; color: var(--text-faint); pointer-events: none;
}
.auth-input-wrap > input {
  width: 100%; height: 38px; padding: 0 12px 0 34px;
  border-radius: 8px; border: 1px solid var(--line-2);
  background: var(--bg-elev); color: var(--text); font-size: 13.5px;
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
}
.auth-field > input:focus, .auth-input-wrap > input:focus, .auth-select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.auth-pass-toggle {
  position: absolute; right: 7px; height: 24px; padding: 0 8px;
  border-radius: 5px; font-size: 11px; font-weight: 600;
  color: var(--text-dim); background: var(--surface-2); border: 1px solid var(--line);
}
.auth-pass-toggle:hover { color: var(--text); }
.auth-link-btn {
  font-size: 11.5px; font-weight: 500; color: var(--accent-text);
  background: none; border: none; padding: 0; cursor: pointer; text-decoration: none;
}
.auth-link-btn:hover { text-decoration: underline; }

.avatar-picker { display: flex; gap: 6px; flex-wrap: wrap; }
.avatar-opt {
  width: 36px; height: 36px; border-radius: 8px;
  border: 1px solid var(--line-2); background: var(--bg-elev);
  font-size: 18px; display: inline-flex; align-items: center; justify-content: center;
  transition: all .14s var(--ease); cursor: pointer;
}
.avatar-opt:hover { border-color: var(--text-dim); }
.avatar-opt.on {
  border-color: var(--accent); background: var(--accent-soft);
  color: var(--accent-text); box-shadow: 0 0 0 2px var(--accent-soft);
}

.auth-submit { width: 100%; justify-content: center; margin-top: 4px; }
.auth-divider {
  position: relative; text-align: center; margin: 18px 0 14px;
}
.auth-divider::before {
  content: ''; position: absolute; left: 0; right: 0; top: 50%;
  height: 1px; background: var(--line);
}
.auth-divider span {
  position: relative; background: var(--surface); padding: 0 10px;
  font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--text-faint);
}
.auth-alt-actions { display: flex; flex-direction: column; gap: 8px; }

/* ── Logged-In Player Profile Dashboard ────────────────────── */
.auth-profile-shell { display: flex; flex-direction: column; gap: 20px; }
.auth-profile-hero {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 22px 24px; border-radius: var(--radius-lg);
  background: var(--surface); border: 1px solid var(--line); flex-wrap: wrap;
}
.auth-profile-ident { display: flex; align-items: center; gap: 16px; }
.auth-avatar-lg {
  width: 60px; height: 60px; border-radius: 16px;
  background: var(--accent-soft); border: 1px solid rgba(56, 189, 248, 0.35);
  color: var(--accent-text); display: inline-flex; align-items: center; justify-content: center;
  font-size: 30px; flex-shrink: 0;
}
.auth-badges-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 6px; }
.auth-profile-ident h1 { font-size: 22px; font-weight: 700; margin: 0 0 2px; }
.auth-profile-ident p { margin: 0; font-size: 13px; }
.auth-hero-actions { display: flex; align-items: center; gap: 10px; }

.auth-stats-strip {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
}
@media (max-width: 760px) { .auth-stats-strip { grid-template-columns: repeat(2, 1fr); } }
.auth-stat-box {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 14px 16px;
}
.as-val { display: block; font: 700 20px/1.2 var(--font-mono); color: var(--text); margin-bottom: 4px; }
.as-lbl { display: block; font-size: 12px; color: var(--text-dim); }

.auth-profile-grid {
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 20px; align-items: start;
}
@media (max-width: 860px) { .auth-profile-grid { grid-template-columns: 1fr; } }
.auth-card h2 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }

.pillar-bars { display: flex; flex-direction: column; gap: 12px; margin-top: 12px; }
.pbar-row { display: flex; flex-direction: column; gap: 5px; }
.pbar-top { display: flex; justify-content: space-between; font-size: 12.5px; color: var(--text-dim); }
.pbar-top b { color: var(--text); }

.account-switch-list { display: flex; flex-direction: column; gap: 8px; }
.account-switch-item {
  display: flex; align-items: center; gap: 12px; padding: 10px 12px;
  border-radius: 9px; border: 1px solid var(--line); background: var(--bg-elev);
  text-align: left; width: 100%; transition: all .14s var(--ease); cursor: pointer;
}
.account-switch-item:hover { border-color: var(--accent); background: var(--surface-2); }
.as-av {
  width: 32px; height: 32px; border-radius: 8px; background: var(--accent-soft);
  color: var(--accent-text); display: inline-flex; align-items: center; justify-content: center;
  font-size: 17px; flex-shrink: 0;
}
.as-info { flex: 1; min-width: 0; }
.as-info b { display: block; font-size: 13px; color: var(--text); }
.as-info small { display: block; font-size: 11px; color: var(--text-dim); font-family: var(--font-mono); }

/* ── Chess Basics Quick Reference Cards ────────────────────── */
.basics-ref-grid {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 16px;
}
@media (max-width: 860px) { .basics-ref-grid { grid-template-columns: 1fr; } }
.basics-ref-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px 18px;
}
.piece-val-chips {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px;
}
.pv-chip {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 11px; border-radius: 8px;
  background: var(--bg-elev); border: 1px solid var(--line);
  font-size: 12.5px; color: var(--text); text-decoration: none;
  transition: all .14s var(--ease);
}
.pv-chip:hover { border-color: var(--accent); background: var(--surface-2); transform: translateY(-1px); }
.pv-chip b { font-weight: 600; color: var(--text); }
.pv-chip span {
  font-family: var(--font-mono); font-size: 11px; color: var(--accent-text);
  background: var(--surface-2); padding: 1px 6px; border-radius: 99px;
}

/* ── Custom Hand-Crafted SVG Doodles for Chess Basics ──────── */
.tier-item-link.basics-stage-card {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  gap: 13px;
  padding: 11px 14px;
  border-radius: 14px;
}
.basics-stage-card .basics-stage-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 2px;
  min-width: 0;
  flex: 1;
  text-align: left;
}
.basics-stage-card .basics-stage-text b {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.25;
}
.basics-stage-card .basics-stage-text span {
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}
.basics-stage-card > .chip {
  margin-left: auto;
  flex-shrink: 0;
}
.basics-doodle-box {
  width: 46px; height: 46px; border-radius: 13px;
  background: color-mix(in srgb, var(--doodle-color, var(--accent)) 18%, #1e1d1a);
  border: 1.5px solid color-mix(in srgb, var(--doodle-color, var(--accent)) 45%, transparent);
  color: var(--doodle-color, var(--accent-text));
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 3px 8px rgba(0, 0, 0, .28), inset 0 1px 0 rgba(255, 255, 255, .08);
  transition: transform .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}
.basics-doodle-box.sm {
  width: 34px; height: 34px; border-radius: 10px;
}
.basics-doodle {
  width: 30px; height: 30px; display: block; flex-shrink: 0;
}
.basics-doodle-box.sm .basics-doodle {
  width: 20px; height: 20px;
}
.tier-item-link:hover .basics-doodle-box,
.pillar-card:hover .basics-doodle-box,
.acad-lesson-card:hover .basics-doodle-box {
  transform: scale(1.06) rotate(-2deg);
  border-color: var(--doodle-color, var(--accent));
  background: color-mix(in srgb, var(--doodle-color, var(--accent)) 26%, #1e1d1a);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

/* ── UI/UX Pro Max: Guided Hubs, Progressive Disclosure & Bento Grid ── */

/* Contextual Hub Sub-Navigation (Apple Segmented Pill Bar) */
.hub-subnav {
  display: inline-flex; align-items: center; gap: 6px; flex-wrap: wrap;
  padding: 6px; margin-bottom: 20px; max-width: 100%;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}
.hub-subnav-title {
  font: 700 11px/1 var(--font-mono); text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--text-faint);
  padding: 0 10px;
}
.hub-subnav-links {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
}
.hub-subnav-pill,
.hub-subnav-item {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 8px 15px; border-radius: 999px;
  font-size: 13px; font-weight: 600; color: var(--text-dim);
  background: transparent; text-decoration: none; border: 1px solid transparent;
  white-space: nowrap; flex-shrink: 0;
  transition: all .16s var(--ease);
}
.hub-subnav-pill:hover,
.hub-subnav-item:hover {
  color: var(--text); background: var(--surface-2);
}
.hub-subnav-pill.on,
.hub-subnav-item.on {
  color: #ffffff; background: var(--accent);
  border-color: var(--accent);
}
.hub-subnav-pill small,
.hub-subnav-item small {
  font: 600 11px/1 var(--font-mono); color: var(--text-faint);
}
.hub-subnav-pill.on small,
.hub-subnav-item.on small { color: #ffffff; opacity: 0.9; }
@media (max-width: 760px) {
  .hub-subnav {
    display: flex; flex-wrap: nowrap; overflow-x: auto;
    width: 100%; border-radius: 16px; padding: 5px;
    scrollbar-width: none; -ms-overflow-style: none;
  }
  .hub-subnav::-webkit-scrollbar { display: none; }
  .hub-subnav-pill,
  .hub-subnav-item {
    padding: 8px 13px; font-size: 12.5px; border-radius: 12px;
  }
}

/* Defining Home Hero Showcase + Player ELO Profile + Spotlight Board (Solid Chess.com Style) */
.home-hero {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 22px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 26px 28px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
@media (max-width: 960px) {
  .home-hero { grid-template-columns: 1fr; padding: 22px; border-radius: 24px; }
}
.hh-main {
  display: flex; flex-direction: column; justify-content: center; gap: 16px;
}
.hh-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font: 700 11px/1 var(--font-mono); text-transform: uppercase;
  letter-spacing: 0.09em; color: var(--accent-text);
}
.hh-brand-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
}
.hh-title {
  font-size: clamp(25px, 3vw, 35px); font-weight: 700;
  letter-spacing: -0.03em; line-height: 1.14; margin: -4px 0 0;
  color: var(--text);
}
.hh-sub {
  font-size: 14.5px; color: var(--text-dim); line-height: 1.5;
  margin: -6px 0 0; max-width: 580px;
}
.hh-actions {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.hh-cta-main {
  box-shadow: 0 3px 0 var(--accent-shadow);
}

/* Personal Player Profile & ELO Milestone Banner inside Hero */
.hh-profile-strip {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  border-radius: 18px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
}
@media (max-width: 680px) {
  .hh-profile-strip { grid-template-columns: 1fr; gap: 10px; }
}
.hh-rank-badge {
  display: flex; align-items: center; gap: 11px;
}
.hh-rank-emblem {
  width: 38px; height: 38px; border-radius: 12px;
  background: var(--accent-soft); border: 1px solid var(--accent);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 18px; flex-shrink: 0;
}
.hh-rank-lbl {
  display: block; font: 700 10px/1 var(--font-mono);
  text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--text-faint); margin-bottom: 4px;
}
.hh-rank-badge b,
.hh-milestone b { font-size: 13.5px; font-weight: 700; color: var(--text); }
.hh-rank-badge small,
.hh-milestone small { font-weight: 500; font-size: 11.5px; color: var(--text-dim); }
.hh-milestone {
  display: flex; flex-direction: column; justify-content: center;
  padding: 0 14px;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}
@media (max-width: 680px) {
  .hh-milestone { padding: 8px 0; border-left: none; border-right: none; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
}
.hh-streak-box {
  display: flex; align-items: center; justify-content: flex-end;
}
@media (max-width: 680px) {
  .hh-streak-box .btn { width: 100%; }
}

/* Right Column: Spotlight Board Card */
.hh-spotlight {
  display: flex; flex-direction: column; justify-content: flex-start; gap: 16px;
  padding: 18px 20px; border-radius: 22px;
  background: var(--bg-elev); border: 2px solid var(--line-2);
  text-decoration: none; color: var(--text);
  transition: transform .16s var(--ease), border-color .16s var(--ease);
}
.hh-spotlight:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}
.hh-spot-top {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding-bottom: 12px; border-bottom: 1px solid var(--line);
}
.hh-spot-tag {
  font: 700 10.5px/1 var(--font-mono); text-transform: uppercase;
  letter-spacing: 0.08em; color: #ffffff;
  background: var(--accent); padding: 6px 12px; border-radius: 999px;
}
.hh-spot-body {
  display: flex; align-items: center; gap: 18px;
}
@media (max-width: 480px) {
  .hh-spot-body { flex-direction: column; align-items: flex-start; }
}
.hh-spot-board {
  width: 148px; height: 148px; flex-shrink: 0;
  border-radius: 14px; overflow: hidden;
  border: 2px solid var(--line-2);
  box-shadow: var(--shadow-sm);
}
.hh-spot-board .mini { width: 100%; height: 100%; display: block; border-radius: 0; }
.hh-spot-info {
  display: flex; flex-direction: column; justify-content: center; gap: 6px; min-width: 0; flex: 1;
}
.hh-spot-track {
  font: 600 11.5px/1 var(--font-mono); color: var(--text-faint);
}
.hh-spot-info h3 {
  font-size: 19px; font-weight: 700; margin: 0; line-height: 1.22; color: var(--text);
}
.hh-spot-info p {
  font-size: 13px; color: var(--text-dim); line-height: 1.45; margin: 0;
}
.hh-spot-cta {
  display: inline-flex; align-items: center; gap: 6px;
  align-self: flex-start;
  font-size: 12.5px; font-weight: 700; color: #ffffff;
  background: var(--accent);
  padding: 7px 14px; border-radius: 10px;
  box-shadow: 0 2px 0 var(--accent-shadow);
  margin-top: 6px;
}

/* Integrated Curriculum Path + 3-Step Session Block */
.home-path-block {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 28px; padding: 24px 26px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

/* Interactive Skill-Level Switcher */
.journey-switcher {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
}
@media (max-width: 820px) { .journey-switcher { grid-template-columns: 1fr; } }
.journey-tab {
  display: flex; flex-direction: column; align-items: flex-start; gap: 4px;
  padding: 15px 18px; border-radius: 20px;
  background: var(--bg-elev); border: 2px solid var(--line);
  text-align: left; cursor: pointer;
  transition: all .16s var(--ease);
}
.journey-tab:hover {
  border-color: var(--line-2); background: var(--surface-2);
  transform: translateY(-1px);
}
.journey-tab.on {
  background: var(--surface-2); border-color: var(--accent);
}
.jt-k,
.jt-badge {
  font: 700 10.5px/1 var(--font-mono); text-transform: uppercase;
  letter-spacing: 0.07em; color: var(--text-faint);
}
.journey-tab.on .jt-k,
.journey-tab.on .jt-badge { color: var(--accent-text); }
.journey-tab b { font-size: 14.5px; font-weight: 700; color: var(--text); }
.journey-tab small,
.journey-tab span:not(.jt-badge) { font-size: 12px; color: var(--text-dim); }

/* 3-Step Guided Session Cards (With Mini-Boards) */
.session-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
}
@media (max-width: 900px) { .session-grid { grid-template-columns: 1fr; } }
.session-card {
  display: flex; flex-direction: column; justify-content: flex-start; gap: 14px;
  padding: 18px 20px; border-radius: 24px;
  background: var(--bg-elev); border: 2px solid var(--line);
  text-decoration: none; color: var(--text);
  transition: transform .16s var(--ease), border-color .16s var(--ease);
}
.session-card:hover {
  transform: translateY(-2px); border-color: var(--accent);
}
.session-card.primary-step,
.session-card.featured {
  border-color: var(--accent);
  background: var(--surface-2);
}
.sc-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.sc-step {
  font: 700 11px/1 var(--font-mono); text-transform: uppercase;
  letter-spacing: 0.07em; color: #ffffff;
  background: var(--accent); padding: 5px 10px; border-radius: 999px;
}
.sc-body {
  display: flex; align-items: center; gap: 14px;
}
.sc-thumb {
  width: 72px; height: 72px; flex-shrink: 0;
  border-radius: 14px; overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
}
.sc-thumb .mini { width: 100%; height: 100%; border-radius: 0; }
.sc-info { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.session-card h3 {
  font-size: 15.5px; font-weight: 700; margin: 0; line-height: 1.25;
}
.session-card p {
  font-size: 12.5px; color: var(--text-dim); line-height: 1.35; margin: 0;
}
.sc-cta {
  display: inline-flex; align-items: center; justify-content: flex-end; gap: 6px;
  font-size: 12.5px; font-weight: 700; color: var(--accent-text);
  padding-top: 10px; border-top: 1px solid var(--line);
  margin-top: auto;
}

/* 4-Card Bento Hub (Zero Prose — 2x2 Visual Action Pill Grid) */
.bento-hub-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px;
}
@media (max-width: 820px) { .bento-hub-grid { grid-template-columns: 1fr; } }
.bento-card {
  display: flex; flex-direction: column; justify-content: flex-start; gap: 16px;
  padding: 22px 24px; border-radius: 26px;
  background: var(--surface); border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: border-color .16s var(--ease), transform .16s var(--ease);
}
.bento-card:hover { border-color: var(--line-2); }
.bento-head,
.bc-head { display: flex; align-items: center; gap: 13px; }
.bento-icon,
.pillar-ic {
  width: 44px; height: 44px; border-radius: 14px;
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.bento-icon.emerald, .pillar-ic.emerald { background: #364229; color: #81b64c; border: 1px solid #4d6237; }
.bento-icon.amber,   .pillar-ic.amber   { background: #463820; color: #f7c631; border: 1px solid #634d28; }
.bento-icon.sky,     .pillar-ic.sky     { background: #273947; color: #5c8bb0; border: 1px solid #365066; }
.bento-icon.purple,  .pillar-ic.purple  { background: #3b2d47; color: #b588e0; border: 1px solid #523d63; }
.bc-kicker {
  display: block; font: 700 10.5px/1 var(--font-mono);
  text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--text-faint); margin-bottom: 3px;
}
.bento-head h3,
.bc-head h3 { font-size: 16.5px; font-weight: 700; margin: 0; line-height: 1.2; }
.bento-links,
.bc-links {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px;
}
@media (max-width: 480px) { .bc-links { grid-template-columns: 1fr; } }
.bento-link,
.bc-pill {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 12px 14px; border-radius: 16px;
  background: var(--bg-elev); border: 1px solid var(--line);
  text-decoration: none; color: var(--text);
  transition: all .16s var(--ease);
}
.bento-link:hover,
.bc-pill:hover {
  border-color: var(--accent); background: var(--surface-2);
  transform: translateY(-1px);
}
.bc-pill b {
  font-size: 13px; font-weight: 600; color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.bc-pill:hover b { color: var(--accent-text); }
.bc-pill span {
  font: 600 11px/1 var(--font-mono); color: var(--text-dim);
  background: var(--surface); border: 1px solid var(--line);
  padding: 4px 8px; border-radius: 999px; flex-shrink: 0;
}

/* Compact Progress Summary Strip */
.home-stats-strip {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px;
  margin-top: 22px;
}
@media (max-width: 960px) { .home-stats-strip { grid-template-columns: repeat(2, 1fr); } }
.hss-item {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 20px; padding: 14px 16px;
  display: flex; flex-direction: column; gap: 6px;
  box-shadow: var(--shadow-sm);
}
.hss-k,
.hss-lbl { font-size: 11.5px; color: var(--text-dim); font-weight: 600; }
.hss-item b { font: 700 14px/1.2 var(--font-mono); color: var(--text); }
.hss-item b small { font-weight: 500; font-size: 11.5px; color: var(--text-dim); }

/* Friendly Starter Filter Bar (Openings & Basics Segmented Views) */
.starter-filter-bar {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px; margin-bottom: 20px;
}
.starter-pill {
  display: flex; flex-direction: column; align-items: flex-start; gap: 4px;
  padding: 13px 16px; border-radius: 18px;
  background: var(--surface); border: 1px solid var(--line);
  text-align: left; cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all .16s var(--ease);
}
.starter-pill:hover {
  border-color: var(--line-2); background: var(--surface-2);
  transform: translateY(-1px);
}
.starter-pill.on {
  background: var(--accent-soft); border-color: var(--accent);
}
.starter-pill b { font-size: 13px; font-weight: 700; color: var(--text); }
.starter-pill.on b { color: var(--accent-text); }
.starter-pill small { font-size: 11.5px; color: var(--text-dim); line-height: 1.3; }

/* Collapsible Chapter Drawer for Practice Studies */
.study-drawer { position: relative; }
.study-drawer summary {
  list-style: none; cursor: pointer;
  font-size: 12px; font-weight: 600; color: var(--text-dim);
  padding: 6px 12px; border-radius: 999px;
  background: var(--bg-elev); border: 1px solid var(--line);
  user-select: none; transition: all .14s var(--ease);
}
.study-drawer summary::-webkit-details-marker { display: none; }
.study-drawer summary::after { content: ' ▾'; font-size: 11px; }
.study-drawer[open] summary {
  color: var(--accent-text); border-color: var(--accent); background: var(--accent-soft);
}
.study-drawer[open] summary::after { content: ' ▴'; }
.study-drawer-list {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-top: 10px; padding: 12px;
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: 16px;
}

/* Clean Tactics Filter Bar & Theme Dropdown */
.tac-filter-bar {
  display: flex; flex-direction: column; gap: 12px;
  padding: 18px 20px; margin-bottom: 20px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow-sm);
}
.tac-filter-row {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap;
}
.tac-theme-select {
  padding: 8px 14px; border-radius: 999px;
  background: var(--bg-elev); border: 1px solid var(--line-2);
  color: var(--text); font-size: 12.5px; font-weight: 600;
  cursor: pointer; max-width: 260px;
}
.tac-theme-select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

/* ==========================================================================
   Comprehensive Mobile & Small-Viewport Polish (All Pages & Board Workspaces)
   ========================================================================== */

/* Prevent horizontal overflow from any child container across all viewports */
html, body {
  max-width: 100%;
  overflow-x: hidden;
}

/* Safe responsive minimums for multi-column grids */
.curriculum-grid {
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
}
.lib-grid {
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 310px), 1fr));
}
.game-grid {
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 310px), 1fr));
}
.pillars-grid {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
}
.tier-items-grid {
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr));
}

/* Ensure action rows & segmented bars wrap or scroll instead of overflowing */
.dc-actions,
.res-actions,
.foot-actions {
  flex-wrap: wrap;
}
.side-pick.analysis-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.side-pick.analysis-actions .btn {
  flex: 1 1 auto;
  justify-content: center;
}
.seg {
  max-width: 100%;
  overflow-x: auto;
  scrollbar-width: none;
}
.seg::-webkit-scrollbar { display: none; }
.db-tabs {
  overflow-x: auto;
  scrollbar-width: none;
}
.db-tabs::-webkit-scrollbar { display: none; }
.db-tab-btn {
  white-space: nowrap;
  flex-shrink: 0;
}

/* Settings modal text-row layout */
.text-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  flex-wrap: wrap;
}
.text-row > span {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1 1 180px;
}
.text-row > span b { font-size: 14px; font-weight: 500; }
.text-row > span em { font-style: normal; font-size: 12px; color: var(--text-3); }

/* Keep board container overflow visible for top-rank move badges while clipping squares cleanly */
.cb {
  overflow: visible;
}
.cb-squares {
  border-radius: 10px;
  overflow: hidden;
}

/* Practice study card drawer expansion */
.practice-study-card .study-drawer[open] {
  width: 100%;
  flex-basis: 100%;
}

/* ── Tablet & Mobile Breakpoint (<= 860px) ── */
@media (max-width: 860px) {
  /* Make sure 5th item in 2-column home stats strip spans full width cleanly */
  .home-stats-strip .hss-item:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }

  /* Hub subnav sticky offset and touch scrolling */
  .hub-subnav {
    margin: -6px 0 14px;
    padding: 5px;
    border-radius: 16px;
    max-width: 100%;
  }
  .hub-tab {
    padding: 8px 13px;
    font-size: 12.5px;
  }

  /* Daily Puzzle Banner on Tactics page */
  .daily-puzzle-banner {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    padding: 16px;
    border-radius: 20px;
  }
  .daily-puzzle-banner > div:last-child {
    width: 100%;
  }
  .daily-puzzle-banner > div:last-child .btn {
    flex: 1 1 auto;
    justify-content: center;
  }

  /* Tactics filter bar on mobile */
  .tac-filter-bar {
    padding: 14px;
    border-radius: 18px;
    gap: 10px;
  }
  .tac-filter-row {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }
  .tac-search-field {
    width: 100%;
    min-width: 0 !important;
  }
  .tac-filter-bar .chips {
    width: 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: none;
  }
  .tac-filter-bar .chips::-webkit-scrollbar { display: none; }
  .tac-filter-bar .chip-btn {
    flex-shrink: 0;
  }
  .tac-theme-select-wrap {
    width: 100%;
    justify-content: space-between;
  }
  .tac-theme-select {
    flex: 1;
    max-width: none;
    min-width: 0;
  }
}

/* ── Mobile Phone Breakpoint (<= 720px) ── */
@media (max-width: 720px) {
  /* Starter filter bar: horizontal swipeable pills so 7 opening categories don't stack into 4 tall rows */
  .starter-filter-bar {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 8px;
    margin: 0 -12px 16px;
    padding: 2px 12px 6px;
    scrollbar-width: none;
  }
  .starter-filter-bar::-webkit-scrollbar { display: none; }
  .starter-pill {
    flex: 0 0 auto;
    min-width: 138px;
    padding: 11px 14px;
    border-radius: 16px;
  }
  .basics-page .starter-filter-bar {
    margin: 0 0 16px;
    padding: 0 0 4px;
  }
  .basics-page .starter-pill {
    flex: 1 1 0;
    min-width: 115px;
    padding: 10px 12px;
  }

  /* Toolbar search + horizontal filter chips */
  .toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-bottom: 18px;
  }
  .field.search {
    min-width: 0;
    width: 100%;
  }
  .toolbar .chips {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: none;
  }
  .toolbar .chips::-webkit-scrollbar { display: none; }
  .toolbar .chip-btn {
    flex-shrink: 0;
  }

  /* Library section header */
  .lib-part-head {
    flex-wrap: wrap;
    gap: 10px;
  }
  .lib-part-head .bar {
    display: none;
  }

  /* Home Hero & Spotlight Card on Mobile */
  .home-hero {
    padding: 18px 16px;
    gap: 18px;
    border-radius: 22px;
    margin-bottom: 18px;
  }
  .hh-copy h1 {
    font-size: 24px;
  }
  .hh-sub {
    font-size: 13.5px;
  }
  .hh-actions {
    width: 100%;
    gap: 8px;
  }
  .hh-actions .btn {
    flex: 1 1 calc(50% - 4px);
    justify-content: center;
    padding: 10px 12px;
    font-size: 13px;
  }
  .hh-actions .btn.lg {
    flex: 1 1 100%;
    padding: 12px 16px;
    font-size: 14px;
  }
  .hh-profile-strip {
    padding: 12px 14px;
    gap: 10px;
    border-radius: 18px;
  }
  .hh-streak-box {
    width: 100%;
    margin-left: 0;
  }
  .hh-streak-box .btn {
    width: 100%;
    justify-content: center;
  }
  .hh-spotlight {
    padding: 14px;
    border-radius: 20px;
  }
  .hh-spot-body {
    flex-direction: row !important;
    align-items: center !important;
    gap: 14px;
  }
  .hh-spot-board {
    width: 104px !important;
    height: 104px !important;
  }

  /* Home Path Block & Bento Grid on Mobile */
  .home-path-block {
    padding: 18px 16px;
    border-radius: 22px;
    margin-bottom: 18px;
  }
  .journey-tab {
    padding: 12px 14px;
    border-radius: 16px;
  }
  .session-card {
    padding: 14px;
    border-radius: 18px;
  }
  .bento-card {
    padding: 16px;
    border-radius: 20px;
    gap: 12px;
  }
  .bc-links {
    gap: 8px;
  }
  .bc-pill {
    padding: 9px 10px;
    border-radius: 12px;
  }
  .bc-pill b {
    font-size: 12px;
  }
  .bc-pill span {
    font-size: 10px;
    padding: 3px 6px;
  }

  /* Academy & Basics Tier Cards on Mobile */
  .academy-hero {
    padding: 18px 16px;
    border-radius: 20px;
    gap: 16px;
  }
  .tier-card {
    padding: 14px;
    border-radius: 18px;
  }
  .tier-card-head {
    margin-bottom: 10px;
  }
  .basics-stage-card {
    padding: 11px 12px !important;
    gap: 10px !important;
  }
  .basics-doodle-box {
    width: 42px;
    height: 42px;
    border-radius: 11px;
  }
  .basics-doodle {
    width: 26px;
    height: 26px;
  }

  /* Play Setup & PGN Studio on Mobile */
  .play-setup-card {
    padding: 16px;
    gap: 18px;
    border-radius: 18px;
  }
  .play-action-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }
  .play-action-bar .btn {
    flex: 1 1 auto;
    justify-content: center;
  }
  .pgn-meta-banner {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .pgn-meta-banner > div:last-child {
    width: 100%;
  }
  .pgn-meta-banner > div:last-child .btn {
    flex: 1 1 auto;
    justify-content: center;
  }

  /* Workspace Panel Footers & Modals on Mobile */
  .pf {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
  .foot-actions {
    width: 100%;
    display: flex;
    gap: 8px;
  }
  .foot-actions .btn {
    flex: 1 1 0;
    justify-content: center;
  }
  .modal-head {
    padding: 14px 16px;
  }
  .modal-body {
    padding: 12px 16px 20px;
  }
  .text-row input.fen-input {
    max-width: 100% !important;
    width: 100%;
  }
}

/* ── Compact Phone Breakpoint (<= 540px) ── */
@media (max-width: 540px) {
  /* Scale on-board move badges & callouts proportionally to mobile board squares (~42px) */
  .cb-move-badge {
    width: 21px;
    height: 21px;
    font-size: 10px;
    top: -5px;
    right: -5px;
    border-width: 2px;
  }
  .cb-move-callout {
    padding: 2.5px 7px 2.5px 4px;
    gap: 4px;
    font-size: 10px;
    bottom: calc(100% + 2px);
    border-width: 1.5px;
  }
  .cb-mc-icon {
    width: 15px;
    height: 15px;
    font-size: 9px;
  }

  /* Compact curriculum & opening cards on phones */
  .curr-card,
  .op-card,
  .game-card {
    padding: 12px;
    gap: 12px;
    border-radius: 16px;
  }
  .curr-thumb,
  .op-card .mb,
  .game-card .mb {
    width: 68px !important;
    height: 68px !important;
    border-radius: 10px;
  }
  .curr-body h3 {
    font-size: 14px;
  }
  .curr-body p {
    font-size: 12px;
  }
  .curr-card-foot .btn.primary {
    flex: 1 1 auto;
    justify-content: center;
  }
  .curr-card-foot .study-drawer {
    flex: 1 1 auto;
  }
  .curr-card-foot .study-drawer summary {
    text-align: center;
  }

  /* Auth & Profile mobile refinements */
  .auth-card {
    padding: 18px 14px;
    border-radius: 18px;
  }
  .auth-showcase {
    padding: 18px 14px;
    border-radius: 18px;
  }
  .auth-tabs .seg-i {
    font-size: 12px;
    padding: 8px 6px;
  }
  .coord-target-sq {
    font-size: 42px;
  }
}

/* ── Extra-Small Phone Breakpoint (<= 380px) ── */
@media (max-width: 380px) {
  .brand-text b {
    font-size: 13px;
  }
  .user-chip span:not(.uc-av) {
    display: none;
  }
  .user-chip {
    padding: 0 8px;
  }
  .bc-links {
    grid-template-columns: 1fr;
  }
  .hh-spot-board {
    width: 86px !important;
    height: 86px !important;
  }
}