/* Chess Weakness Drill — Treasures design language translated to a chessboard.
   Palette: paper #faf6ee / ink #2a2019 / vermillion #a83a28 / gold #b08d2f. */
:root {
  --paper: #faf6ee;
  --paper-card: #fffdf7;
  --ink: #2a2019;
  --ink-soft: #5a4c3e;
  --vermillion: #a83a28;
  --gold: #b08d2f;
  --gold-bright: #c9a227;
  --line: #ddd2ba;
  --sq-light: #f1e7d0;
  --sq-dark: #9c7c53;
  --sq-light-sel: #e8d194;
  --sq-dark-sel: #c2a054;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: Georgia, 'Times New Roman', serif;
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
}
.page { max-width: 560px; margin: 0 auto; padding: 20px 14px 40px; }

/* ---------- header ---------- */
.site-header { text-align: center; padding: 10px 0 4px; }
.brand-mark { font-size: 40px; color: var(--vermillion); line-height: 1; }
.site-header h1 {
  font-size: 30px; margin: 6px 0 2px; letter-spacing: .02em; font-weight: 700;
}
.tagline { margin: 0; color: var(--ink-soft); font-size: 15px; }
.gold-rule {
  height: 3px; margin: 14px auto 4px; max-width: 420px;
  background: linear-gradient(90deg, transparent, var(--gold) 20%, var(--gold) 80%, transparent);
}

/* ---------- status strip ---------- */
.status-strip {
  display: flex; justify-content: space-between; align-items: center;
  margin: 14px 2px 6px; font-size: 15px;
}
.streak-chip {
  border: 1px solid var(--gold); color: var(--gold); border-radius: 999px;
  padding: 1px 10px; font-size: 13px; background: #fdf6dd;
}
.progress-row {
  display: flex; justify-content: space-between; align-items: center; margin: 0 2px 10px;
}
.progress-text { font-size: 14px; color: var(--ink-soft); letter-spacing: .04em; }
.progress-dots .dot {
  display: inline-block; width: 11px; height: 11px; border-radius: 50%;
  border: 2px solid var(--ink-soft); margin-left: 6px; vertical-align: middle;
}
.progress-dots .dot.current { border-color: var(--vermillion); background: #f0c9c0; }
.progress-dots .dot.done-clean { background: var(--gold); border-color: var(--gold); }
.progress-dots .dot.done-helped { background: var(--vermillion); border-color: var(--vermillion); }

/* ---------- board card ---------- */
.board-card {
  background: var(--paper-card); border: 1px solid var(--line);
  border-radius: 10px; padding: 14px 12px 16px;
  box-shadow: 0 2px 10px rgba(42, 32, 25, .07);
}
.board-head {
  display: flex; justify-content: space-between; align-items: center; gap: 8px;
  margin-bottom: 10px; flex-wrap: wrap;
}
.turn-label { font-size: 18px; font-weight: 700; }
.meta-chips { display: flex; gap: 6px; }
.chip {
  font-size: 12.5px; border-radius: 999px; padding: 1px 9px; white-space: nowrap;
}
.chip-rating { background: #efe7d2; color: var(--ink-soft); border: 1px solid var(--line); }
.chip-focus { background: var(--vermillion); color: #fff; }

.board-wrap { position: relative; width: min(100%, 440px); margin: 0 auto; }
.board {
  display: grid; grid-template-columns: repeat(8, 1fr);
  width: 100%; aspect-ratio: 1 / 1;
  border: 3px solid var(--ink); border-radius: 4px; overflow: hidden;
  touch-action: manipulation; user-select: none; -webkit-user-select: none;
}
.sq {
  position: relative; aspect-ratio: 1 / 1;
  display: flex; align-items: center; justify-content: center;
  font-size: min(9.6vw, 46px); line-height: 1; cursor: default;
}
.sq.light { background: var(--sq-light); }
.sq.dark { background: var(--sq-dark); }
.sq.own { cursor: pointer; }
.sq.selected.light { background: var(--sq-light-sel); }
.sq.selected.dark { background: var(--sq-dark-sel); }
.sq.lastmove::after {
  content: ''; position: absolute; inset: 0; background: rgba(201, 162, 39, .38);
}
.sq .piece { position: relative; z-index: 2; pointer-events: none; }
.sq .piece.w { color: #fdfaf2; text-shadow: 0 0 2px #2a2019, 1px 1px 1px #2a2019, -1px -1px 1px #2a2019, 1px -1px 1px #2a2019, -1px 1px 1px #2a2019; }
.sq .piece.b { color: #241a12; text-shadow: 0 1px 1px rgba(250,246,238,.35); }
.sq .coord {
  position: absolute; z-index: 3; font-size: 10px; font-family: Georgia, serif;
  color: var(--gold); font-weight: 700; pointer-events: none;
}
.sq .coord.rank { top: 2px; left: 3px; }
.sq .coord.file { bottom: 1px; right: 3px; }
.sq.dark .coord { color: #f1e7d0; }
.sq.target::before {
  content: ''; position: absolute; z-index: 1; width: 30%; height: 30%;
  border-radius: 50%; background: rgba(42, 32, 25, .35);
}
.sq.target.capture::before {
  width: 88%; height: 88%; background: transparent;
  border: calc(min(9.6vw, 46px) * .09) solid rgba(168, 58, 40, .75); border-radius: 50%;
}
.sq.hint-from { box-shadow: inset 0 0 0 4px var(--gold-bright); }
.sq.hint-to { box-shadow: inset 0 0 0 4px var(--vermillion); }
.sq.incheck { background: #d98a76 !important; }
.board.shake { animation: shake .32s ease-in-out; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}
.board.flash-good { animation: flashgood .5s ease-in-out; }
@keyframes flashgood {
  0% { box-shadow: 0 0 0 0 rgba(201, 162, 39, 0); }
  35% { box-shadow: 0 0 0 6px rgba(201, 162, 39, .75); }
  100% { box-shadow: 0 0 0 0 rgba(201, 162, 39, 0); }
}

/* promotion picker */
.promo-picker {
  position: absolute; inset: 0; z-index: 5;
  background: rgba(42, 32, 25, .55);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  border-radius: 4px;
}
.promo-picker[hidden] { display: none; }
.promo-picker p { color: var(--paper); margin: 0 0 10px; font-size: 17px; }
.promo-btns { display: flex; gap: 8px; }
.promo-btns button {
  width: 62px; height: 62px; font-size: 42px; line-height: 1;
  background: var(--sq-light); border: 2px solid var(--gold); border-radius: 8px;
  color: var(--ink); cursor: pointer;
}

/* feedback + controls */
.feedback {
  min-height: 26px; text-align: center; font-size: 16.5px; margin: 12px 4px 4px;
}
.feedback.good { color: var(--gold); font-weight: 700; }
.feedback.bad { color: var(--vermillion); font-weight: 700; }
.controls {
  display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-top: 8px;
}
.btn {
  font-family: inherit; font-size: 15.5px; padding: 10px 16px; min-height: 46px;
  border-radius: 8px; cursor: pointer;
}
.btn-sub { background: #fff; color: var(--ink); border: 1.5px solid var(--ink-soft); }
.btn-sub:active { background: #efe7d2; }
.btn-main { background: var(--vermillion); color: #fff; border: 1.5px solid var(--vermillion); font-weight: 700; }
.btn-main:active { background: #8e3122; }
.btn[disabled] { opacity: .45; cursor: default; }

/* ---------- weak points ---------- */
.weak-card, .about-card, .results-card {
  background: var(--paper-card); border: 1px solid var(--line);
  border-radius: 10px; padding: 14px 16px; margin-top: 14px;
  box-shadow: 0 2px 10px rgba(42, 32, 25, .05);
}
.weak-card h2, .about-card h2, .results-card h2 { margin: 2px 0 6px; font-size: 20px; }
.weak-note { margin: 0 0 8px; color: var(--ink-soft); font-size: 14px; }
.weak-list { list-style: none; margin: 0; padding: 0; }
.weak-list li {
  display: flex; justify-content: space-between; padding: 6px 2px;
  border-top: 1px solid var(--line); font-size: 15.5px;
}
.weak-list li:first-child { border-top: none; }
.weak-list .misses { color: var(--vermillion); font-weight: 700; }

/* ---------- ad slot ---------- */
.ad-slot { margin: 18px auto 4px; min-height: 90px; text-align: center; }

/* ---------- about / footer ---------- */
.about-card p { margin: 6px 0; font-size: 15px; }
.credit { color: var(--ink-soft); font-size: 13px; }
.site-footer { text-align: center; margin-top: 22px; color: var(--ink-soft); font-size: 13.5px; }
.site-footer p { margin: 2px 0; }

/* ---------- results ---------- */
.results-streak { color: var(--gold); font-weight: 700; font-size: 17px; margin: 2px 0 10px; }
.results-list { list-style: none; margin: 0; padding: 0; }
.results-list li {
  display: flex; justify-content: space-between; gap: 10px; align-items: baseline;
  padding: 8px 2px; border-top: 1px solid var(--line); font-size: 15.5px;
}
.results-list li:first-child { border-top: none; }
.results-list .r-tags { color: var(--ink-soft); font-size: 13.5px; }
.result-badge { font-weight: 700; white-space: nowrap; }
.result-badge.clean { color: var(--gold); }
.result-badge.helped { color: var(--ink-soft); }
.result-badge.missed { color: var(--vermillion); }
.results-weak { margin-top: 10px; font-size: 15px; }
.results-weak strong { color: var(--vermillion); }
.come-back { color: var(--ink-soft); margin-bottom: 2px; }