/* Chess Coach — warm dark theme, mobile-first.
   Semantic colors are sacred: green = good/advantage, red = bad/loss, amber = warning. */

:root {
  --bg: #14171d;
  --bg-2: #1b1f27;
  --card: #20242e;
  --card-2: #262b36;
  --line: #333a47;
  --line-soft: #2a303b;
  --ink: #eef1f6;
  --ink-dim: #aab2c0;
  --ink-faint: #7c8698;

  --accent: #e0a44c;       /* warm amber-gold — brand */
  --accent-ink: #241a09;
  --accent-soft: #4a3a1c;

  --good: #4fbe7c;         /* advantage / best move */
  --good-soft: #1e3a2a;
  --bad: #e0655b;          /* disadvantage */
  --bad-soft: #3a211e;
  --warn: #e3b341;

  --sq-light: #e9d7b8;
  --sq-dark: #9a7b52;
  --sq-light-sel: #f4e08a;
  --sq-dark-sel: #c9a94f;

  --arrow: #4fbe7c;
  --arrow-2: #e0a44c;

  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 6px 20px rgba(0,0,0,.34);

  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: radial-gradient(1200px 600px at 50% -10%, #1c2130 0%, var(--bg) 60%) fixed;
  color: var(--ink);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  padding-bottom: calc(var(--safe-b) + 12px);
}

/* ---------- header ---------- */
.app-header {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px;
  padding: calc(var(--safe-t) + 10px) calc(var(--safe-r) + 14px) 10px calc(var(--safe-l) + 14px);
  background: linear-gradient(180deg, var(--bg-2) 0%, rgba(27,31,39,.86) 100%);
  border-bottom: 1px solid var(--line-soft);
  backdrop-filter: blur(8px);
}
.brand { display: flex; align-items: center; gap: 9px; }
.brand-mark {
  font-size: 22px; color: var(--accent);
  filter: drop-shadow(0 1px 0 rgba(0,0,0,.4));
}
.app-header h1 { font-size: 17px; margin: 0; letter-spacing: .2px; font-weight: 650; }
.engine-pill {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 11.5px; color: var(--ink-dim);
  background: var(--card); border: 1px solid var(--line-soft);
  padding: 5px 10px; border-radius: 999px;
}
.engine-pill .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--warn); box-shadow: 0 0 0 3px rgba(227,179,65,.14);
  transition: background .3s;
}
.engine-pill.ready .dot { background: var(--good); box-shadow: 0 0 0 3px rgba(79,190,124,.16); }
.engine-pill.err .dot { background: var(--bad); }

/* ---------- step rail ---------- */
.steps {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 6px; max-width: 960px; margin: 12px auto 0;
  padding: 0 calc(var(--safe-r) + 14px) 0 calc(var(--safe-l) + 14px);
}
.step {
  appearance: none; cursor: default;
  display: flex; align-items: center; justify-content: center; gap: 6px;
  font-size: 12px; color: var(--ink-faint);
  background: var(--card); border: 1px solid var(--line-soft);
  border-radius: 999px; padding: 7px 4px; min-height: 34px;
  transition: all .2s;
}
.step b {
  display: inline-grid; place-items: center;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--line); color: var(--ink-dim); font-size: 11px;
}
.step.active { color: var(--ink); border-color: var(--accent-soft); background: var(--card-2); }
.step.active b { background: var(--accent); color: var(--accent-ink); }
.step.done { color: var(--ink-dim); }
.step.done b { background: var(--good); color: #062015; }

/* ---------- layout ---------- */
.app-main {
  max-width: 960px; margin: 0 auto;
  padding: 14px calc(var(--safe-r) + 14px) 24px calc(var(--safe-l) + 14px);
}
.card {
  background: var(--card); border: 1px solid var(--line-soft);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 16px; margin-top: 14px;
}
.stage[hidden] { display: none; }
.lede { margin: 0 0 14px; font-size: 15px; color: var(--ink); }
.lede b { color: #fff; }
.hint { margin: 12px 0 0; font-size: 12.5px; color: var(--ink-faint); }
.warn {
  margin: 12px 0 0; font-size: 13px; color: var(--warn);
  background: rgba(227,179,65,.08); border: 1px solid rgba(227,179,65,.25);
  border-radius: var(--radius-sm); padding: 9px 11px;
}

/* ---------- buttons ---------- */
.btn {
  appearance: none; cursor: pointer; user-select: none;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 14px; font-weight: 600; line-height: 1;
  border-radius: var(--radius-sm); padding: 12px 16px; min-height: 44px;
  border: 1px solid var(--line); background: var(--card-2); color: var(--ink);
  transition: transform .06s ease, background .18s, border-color .18s, opacity .18s;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.btn-primary:hover { background: #ecb35e; }
.btn-ghost { background: var(--card-2); }
.btn-ghost:hover { border-color: var(--line); background: #2b3140; }
.btn-link { background: transparent; border-color: transparent; color: var(--accent); min-height: 36px; padding: 8px; }
.btn-big { font-size: 16px; padding: 16px 20px; min-height: 54px; }
.capture-actions { display: flex; flex-direction: column; gap: 10px; }
.capture-actions .btn { width: 100%; }
.demo-row { text-align: center; margin-top: 6px; }
.row-actions {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px;
}
.row-actions .btn { flex: 1 1 auto; }
.row-actions .btn-primary { flex: 2 1 auto; }

/* ---------- corners stage ---------- */
.corner-wrap { position: relative; width: 100%; border-radius: var(--radius-sm); overflow: hidden; background: #0d0f14; }
.corner-canvas { display: block; width: 100%; touch-action: none; }
.corner-badge {
  position: absolute; left: 10px; top: 10px;
  background: rgba(20,23,29,.82); border: 1px solid var(--line);
  color: var(--ink); font-size: 12.5px; font-weight: 600;
  padding: 6px 11px; border-radius: 999px; pointer-events: none;
}
.corner-order { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px; }
.corner-order span {
  font-size: 11px; color: var(--ink-faint);
  border: 1px dashed var(--line); border-radius: 999px; padding: 4px 9px;
}
.corner-order span.set { color: var(--good); border-style: solid; border-color: var(--good-soft); }

/* ---------- board editor / result ---------- */
.orient-toggle, .side-move {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin: 0 0 14px; font-size: 13px; color: var(--ink-dim);
}
.side-move { margin: 14px 0 0; }
.seg {
  display: inline-flex; background: var(--bg-2); border: 1px solid var(--line-soft);
  border-radius: 999px; padding: 3px; gap: 3px;
}
.seg button {
  appearance: none; cursor: pointer; border: none; background: transparent;
  color: var(--ink-dim); font-size: 12.5px; font-weight: 600;
  padding: 7px 12px; border-radius: 999px; min-height: 34px;
}
.seg button.active { background: var(--accent); color: var(--accent-ink); }

.editor-grid, .result-grid {
  display: grid; grid-template-columns: 1fr; gap: 16px;
}

.board-frame {
  position: relative;
  --pad: 18px;
  padding: var(--pad) var(--pad) var(--pad) var(--pad);
  background: linear-gradient(160deg, #3a2f1f, #2a2213);
  border: 1px solid #1c160c; border-radius: 12px;
  box-shadow: inset 0 0 0 2px rgba(0,0,0,.28), var(--shadow);
}
.chessboard {
  position: relative;
  display: grid; grid-template-columns: repeat(8, 1fr); grid-template-rows: repeat(8, 1fr);
  aspect-ratio: 1 / 1; width: 100%;
  border-radius: 4px; overflow: hidden;
  touch-action: manipulation;
}
.sq {
  position: relative;
  display: grid; place-items: center;
  font-size: min(8.4vw, 40px); line-height: 1;
  user-select: none; cursor: pointer;
}
.result-grid .sq, .board-frame.readonly .sq { cursor: default; }
.sq.light { background: var(--sq-light); }
.sq.dark  { background: var(--sq-dark); }
.sq.sel.light { background: var(--sq-light-sel); }
.sq.sel.dark  { background: var(--sq-dark-sel); }
.sq .pc {
  filter: drop-shadow(0 1px 1px rgba(0,0,0,.35));
  pointer-events: none;
}
.sq .pc.w { color: #fbfbfa; text-shadow: 0 0 1px #000, 0 1px 2px rgba(0,0,0,.5); }
.sq .pc.b { color: #1c1c1c; text-shadow: 0 0 1px rgba(255,255,255,.25); }
.sq.hl-from { box-shadow: inset 0 0 0 3px var(--good); }
.sq.hl-to   { box-shadow: inset 0 0 0 3px var(--arrow-2); }

/* rank/file labels */
.rank-labels, .file-labels {
  position: absolute; display: grid; color: var(--accent);
  font-size: 10px; font-weight: 700; pointer-events: none; opacity: .8;
}
.rank-labels {
  left: 3px; top: var(--pad); bottom: var(--pad);
  grid-template-rows: repeat(8, 1fr); align-items: center; justify-items: center; width: 14px;
}
.file-labels {
  bottom: 2px; left: var(--pad); right: var(--pad);
  grid-template-columns: repeat(8, 1fr); align-items: center; justify-items: center; height: 14px;
}

/* arrows overlay */
.arrows {
  position: absolute; inset: var(--pad);
  width: calc(100% - 2*var(--pad)); height: calc(100% - 2*var(--pad));
  pointer-events: none; overflow: visible;
}

/* warp peek + palette */
.warp-peek { display: flex; align-items: center; gap: 10px; margin-top: 10px; font-size: 12px; color: var(--ink-faint); }
.warp-thumb { width: 96px; height: 96px; border-radius: 8px; border: 1px solid var(--line); background: #0d0f14; image-rendering: auto; }

.palette-col { }
.palette { display: flex; flex-direction: column; gap: 10px; }
.palette-group { }
.palette-title { font-size: 11px; color: var(--ink-faint); margin-bottom: 5px; text-transform: uppercase; letter-spacing: .5px; }
.palette-row { display: flex; gap: 6px; }
.pal {
  appearance: none; cursor: pointer;
  flex: 1 1 0; min-width: 0; aspect-ratio: 1 / 1; max-width: 52px;
  display: grid; place-items: center;
  font-size: 26px; line-height: 1;
  background: var(--card-2); border: 1px solid var(--line); border-radius: 10px;
  transition: border-color .15s, transform .06s, background .15s;
}
.pal:active { transform: translateY(1px); }
.pal.sel { border-color: var(--accent); background: var(--accent-soft); box-shadow: 0 0 0 2px rgba(224,164,76,.25); }
.pal.w { color: #fbfbfa; text-shadow: 0 0 1px #000, 0 1px 2px rgba(0,0,0,.5); }
.pal.b { color: #1c1c1c; text-shadow: 0 0 1px rgba(255,255,255,.3); }
.empty-pal {
  font-size: 13px; font-weight: 700; color: var(--ink-dim);
  padding: 12px; aspect-ratio: auto; max-width: none; width: 100%;
}
.empty-pal.sel { border-color: var(--accent); background: var(--accent-soft); color: var(--ink); }

/* advanced */
.adv { margin-top: 14px; border-top: 1px solid var(--line-soft); padding-top: 10px; }
.adv summary { cursor: pointer; font-size: 13px; color: var(--ink-dim); }
.castle-row { display: flex; flex-wrap: wrap; gap: 10px 16px; margin-top: 10px; font-size: 13px; }
.castle-row label { display: inline-flex; align-items: center; gap: 6px; }
.fen-line { word-break: break-all; }
.fen-line code { color: var(--ink-dim); font-size: 11.5px; }

/* ---------- result ---------- */
.result-head { display: flex; align-items: center; gap: 12px; margin-bottom: 4px; }
.eval-badge {
  font-size: 20px; font-weight: 800; letter-spacing: .3px;
  padding: 8px 14px; border-radius: 10px; min-width: 74px; text-align: center;
  background: var(--card-2); border: 1px solid var(--line); color: var(--ink);
}
.eval-badge.good { color: var(--good); border-color: var(--good-soft); background: var(--good-soft); }
.eval-badge.bad  { color: var(--bad);  border-color: var(--bad-soft);  background: var(--bad-soft); }
.eval-badge.mate { color: #fff; background: linear-gradient(120deg,#7a4dd0,#b04dd0); border-color: transparent; }
.turn-note { font-size: 13px; color: var(--ink-dim); }

.moves-col h2 { font-size: 14px; margin: 4px 0 10px; color: var(--ink-dim); font-weight: 650; }
.movelist { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.movelist li {
  display: grid; grid-template-columns: 26px 1fr auto; align-items: center; gap: 10px;
  background: var(--card-2); border: 1px solid var(--line-soft); border-radius: 10px;
  padding: 10px 12px; cursor: pointer; transition: border-color .15s, background .15s;
}
.movelist li:hover { border-color: var(--line); }
.movelist li.top { border-color: var(--good-soft); background: linear-gradient(90deg, rgba(79,190,124,.10), var(--card-2) 60%); }
.movelist li.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent-soft) inset; }
.mv-rank { font-size: 12px; font-weight: 800; color: var(--ink-faint); text-align: center; }
.movelist li.top .mv-rank { color: var(--good); }
.mv-san { font-size: 16px; font-weight: 700; letter-spacing: .3px; }
.mv-san .pieceico { margin-right: 3px; }
.mv-eval { font-size: 13px; font-weight: 700; color: var(--ink-dim); font-variant-numeric: tabular-nums; }
.mv-line { grid-column: 1 / -1; font-size: 11.5px; color: var(--ink-faint); margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.strength-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 14px; font-size: 13px; color: var(--ink-dim); }
.strength-row select {
  appearance: none; background: var(--card-2); color: var(--ink);
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; font-size: 13px;
}
.depth-line { margin-top: 10px; font-size: 12px; color: var(--ink-faint); }
.think-bar { height: 5px; background: var(--bg-2); border-radius: 999px; overflow: hidden; margin-top: 6px; border: 1px solid var(--line-soft); }
.think-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--good)); transition: width .25s; }

/* ---------- toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: calc(var(--safe-b) + 18px); transform: translateX(-50%);
  background: #2b3140; color: var(--ink); border: 1px solid var(--line);
  padding: 11px 16px; border-radius: 999px; font-size: 13px; z-index: 50;
  box-shadow: var(--shadow); max-width: 90vw; text-align: center;
}
.toast[hidden] { display: none; }

/* ---------- setup banner (honest positioning) ---------- */
.setup-banner {
  display: flex; flex-direction: column; gap: 6px;
  background: rgba(224,164,76,.08); border: 1px solid rgba(224,164,76,.22);
  border-radius: var(--radius-sm); padding: 11px 13px; margin: 0 0 12px;
}
.setup-banner p { margin: 0; font-size: 13px; color: var(--ink-dim); }
.setup-banner b { color: var(--ink); }
.setup-tag {
  align-self: flex-start; font-size: 10.5px; font-weight: 800; letter-spacing: .6px;
  text-transform: uppercase; color: var(--accent-ink); background: var(--accent);
  padding: 3px 8px; border-radius: 999px;
}
.nowrap { white-space: nowrap; }

/* ---------- edit tools ---------- */
.edit-tools { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.btn-sm { min-height: 38px; padding: 9px 13px; font-size: 13px; flex: 1 1 auto; }

/* ---------- pre-analysis check summary ---------- */
.check-summary {
  margin-top: 14px; background: var(--bg-2); border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm); padding: 10px 12px;
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px 16px;
}
.check-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; font-size: 12.5px; color: var(--ink-faint); }
.check-row b { font-weight: 700; color: var(--ink-dim); font-size: 12.5px; }
.check-row b.ok { color: var(--good); }
.check-row b.no { color: var(--bad); }
.check-fix {
  grid-column: 1 / -1; margin: 4px 0 0; font-size: 12.5px; color: var(--warn);
  border-top: 1px solid var(--line-soft); padding-top: 8px;
}
.check-fix[hidden] { display: none; }

/* ---------- footer / about ---------- */
.app-footer { margin-top: 18px; }
.about { color: var(--ink-faint); }
.about summary { cursor: pointer; font-size: 12.5px; color: var(--ink-faint); text-align: center; list-style: none; }
.about summary::-webkit-details-marker { display: none; }
.about summary::after { content: " ▾"; }
.about[open] summary::after { content: " ▴"; }
.about p { font-size: 12px; color: var(--ink-faint); line-height: 1.55; margin: 10px 2px; }
.about a { color: var(--accent); }

/* ---------- responsive: two columns on wider screens ---------- */
@media (min-width: 720px) {
  .capture-actions { flex-direction: row; }
  .editor-grid { grid-template-columns: minmax(0, 1.35fr) minmax(180px, .8fr); align-items: start; }
  .result-grid { grid-template-columns: minmax(0, 1.2fr) minmax(240px, 1fr); align-items: start; }
  .sq { font-size: min(4.4vw, 44px); }
  .pal { font-size: 28px; }
}
@media (min-width: 720px) and (max-width: 980px) {
  .sq { font-size: 40px; }
}