/* House tokens: paper #f7f6f2, surface white, ink #16181d, line #e5e2d9,
   dim #66707c, accent #e8590c, ok #1a7f4e. Light mode only. */

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --paper: #f7f6f2;
  --ink: #16181d;
  --line: #e5e2d9;
  --dim: #66707c;
  --accent: #e8590c;
  --ok: #1a7f4e;
  --sq-light: #efe9db;
  --sq-dark: #b9ae95;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.mono, .eyebrow, .wordmark, .move, .move-num, #elo-out {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

nav {
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.wordmark {
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.15em;
}
.accent { color: var(--accent); }
.nav-right { display: flex; gap: 10px; }

.wrap {
  flex: 1;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(280px, 1fr);
  gap: 24px;
  align-items: start;
}
@media (max-width: 880px) {
  .wrap { grid-template-columns: 1fr; }
}

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
}

.eyebrow {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--dim);
}

.dim { color: var(--dim); font-size: 16px; line-height: 1.5; }

/* ---- board ---- */
.board-col { display: flex; flex-direction: column; gap: 16px; }
.board-row { display: flex; gap: 10px; align-items: stretch; }

#board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  width: min(88vw, 560px);
  aspect-ratio: 1;
  border: 2px solid var(--ink);
  border-radius: 6px;
  overflow: hidden;
}
.board-wrap { position: relative; }

.sq {
  border: none;
  font-size: clamp(22px, 5.2vw, 44px);
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
}
.sq.light { background: var(--sq-light); }
.sq.dark { background: var(--sq-dark); }
.sq.last { box-shadow: inset 0 0 0 100vmax rgba(232, 89, 12, 0.18); }
.sq.sel { box-shadow: inset 0 0 0 3px var(--accent); }
.sq.dot::after {
  content: "";
  width: 22%;
  height: 22%;
  border-radius: 50%;
  background: rgba(22, 24, 29, 0.25);
  position: absolute;
}
.sq { position: relative; }
.sq.cap { box-shadow: inset 0 0 0 3px rgba(232, 89, 12, 0.55); }
.sq[data-color="w"] { color: #fff; text-shadow: 0 0 2px #16181d, 0 0 2px #16181d, 0 1px 1px #16181d; }
.sq[data-color="b"] { color: #16181d; }

#evalbar {
  width: 14px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: #16181d;
  display: flex;
  flex-direction: column-reverse;
  overflow: hidden;
}
#evalbar-white {
  background: #fff;
  height: 50%;
  transition: height 0.4s ease;
}

#promo {
  position: absolute;
  inset: 0;
  background: rgba(247, 246, 242, 0.88);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}
#promo.hidden { display: none; }
#promo button {
  font-size: 40px;
  width: 64px;
  height: 64px;
  background: #fff;
  border: 2px solid var(--ink);
  border-radius: 12px;
  cursor: pointer;
}
#promo button:hover { border-color: var(--accent); }

/* ---- controls ---- */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.elo-ctl { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 220px; }
.elo-ctl input[type="range"] { flex: 1; accent-color: var(--accent); }
#elo-out { font-weight: 700; font-size: 16px; min-width: 4ch; text-align: right; }

.btn {
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 16px;
  cursor: pointer;
  border: 1px solid transparent;
  background: none;
  font-family: inherit;
  align-self: center;
  white-space: nowrap;
}
.btn.primary { background: var(--ink); color: #fff; }
.btn.ghost { border-color: var(--line); color: var(--dim); background: #fff; }
.btn.ghost:hover { border-color: var(--accent); color: var(--ink); }
.btn.tiny { padding: 4px 10px; font-size: 13px; border: 1px solid var(--line); color: var(--dim); background: #fff; }
.btn.tiny:hover { border-color: var(--accent); color: var(--ink); }
.btn:disabled { opacity: 0.4; cursor: default; }

.input {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 16px;
  font-family: inherit;
  background: #fff;
  color: var(--ink);
}

/* ---- side column ---- */
.side-col { display: flex; flex-direction: column; gap: 16px; min-width: 0; }

.status { font-size: 16px; line-height: 1.4; margin-bottom: 8px; }

.replay { display: flex; gap: 6px; margin-bottom: 8px; }

#moves {
  max-height: 220px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.move-row { display: flex; gap: 6px; align-items: baseline; }
.move-num { color: var(--dim); font-size: 14px; width: 3ch; text-align: right; }
.move {
  border: none;
  background: none;
  font-size: 15px;
  padding: 2px 6px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--ink);
}
.move:hover { background: var(--paper); }
.move.cur { background: var(--ink); color: #fff; }
.move.blunder { color: var(--accent); font-weight: 700; }
.move.dubious { color: var(--accent); }

/* ---- graph ---- */
#graph { width: 100%; height: 60px; display: block; margin: 10px 0; }
.g-bg { fill: var(--paper); }
.g-mid { stroke: var(--line); stroke-width: 1; }
.g-line { stroke: var(--ink); stroke-width: 1.5; fill: none; }
.g-mark { fill: #fff; stroke: var(--accent); stroke-width: 2; cursor: pointer; }
.g-mark.g-bad { fill: var(--accent); }
.g-cur { stroke: var(--accent); stroke-width: 1; }

.moment { display: flex; align-items: center; justify-content: space-between; padding: 4px 0; border-top: 1px solid var(--line); }
.moment:first-child { border-top: none; }

.coach-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
#coach-out p { font-size: 16px; line-height: 1.55; margin-bottom: 8px; }

/* ---- footer / dialogs ---- */
footer {
  border-top: 1px solid var(--line);
  padding: 14px 24px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  color: var(--dim);
  font-size: 13px;
}
footer a { color: var(--dim); }

dialog {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
  max-width: 440px;
  width: calc(100vw - 48px);
}
dialog::backdrop { background: rgba(22, 24, 29, 0.35); }
dialog h2 { font-size: 22px; font-weight: 700; margin-bottom: 8px; }
dialog label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 600; margin-top: 14px; }
dialog .dim { margin-bottom: 4px; font-size: 14px; }
.note { color: var(--accent); font-size: 14px; min-height: 1em; }
.dlg-row { display: flex; gap: 10px; margin-top: 18px; }

.arch-row {
  width: 100%;
  display: flex;
  gap: 12px;
  align-items: baseline;
  justify-content: space-between;
  background: none;
  border: none;
  border-top: 1px solid var(--line);
  padding: 10px 2px;
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  text-align: left;
}
.arch-row:first-child { border-top: none; }
.arch-row:hover { color: var(--accent); }
.arch-row .mono { font-weight: 700; }

.hidden { display: none; }