/* Best Move – simple, light styling. */
:root {
  --bg: #f4f2ee;
  --fg: #222;
  --muted: #6b6760;
  --card: #fff;
  --line: #ddd8cf;
  --accent: #96644b;      /* the board's dark square colour */
  --accent-dark: #6f4835;
  --mine: #2f6fd6;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent-dark); }
[hidden] { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }

/* Header */
.top { background: #222; color: #eee; }
.top-inner {
  max-width: 1100px; margin: 0 auto; padding: .6rem 1rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}
.brand { color: #fff; font-weight: 700; font-size: 1.25rem; text-decoration: none; letter-spacing: .02em; }
.top nav { display: flex; gap: 1rem; flex-wrap: wrap; }
.top nav a { color: #ddd; text-decoration: none; font-size: .95rem; }
.top nav a:hover { color: #fff; text-decoration: underline; }
.top nav a.home { color: #c9a48f; }

main { max-width: 1100px; margin: 0 auto; padding: 1rem; }
main.narrow { max-width: 700px; }
h1 { font-size: 1.4rem; margin: .2rem 0 .4rem; }
h2 { font-size: 1.2rem; margin: 0 0 .3rem; }
h3 { font-size: 1rem; margin: 1rem 0 .4rem; }
.loading { color: var(--muted); }
.note { background: #fff6d8; border: 1px solid #ecd98f; padding: .4rem .7rem; border-radius: 6px; margin: .3rem 0 .6rem; }

/* Progress strip */
.strip { display: flex; gap: .4rem; align-items: stretch; flex-wrap: wrap; margin: .5rem 0 1rem; }
.step {
  min-width: 3.4rem; padding: .25rem .5rem; border: 2px solid var(--line); border-radius: 8px;
  background: var(--card); cursor: pointer; display: flex; flex-direction: column; align-items: center;
  font: inherit; color: var(--fg); line-height: 1.15;
}
.step-n { font-size: .72rem; color: var(--muted); }
.step-s { font-weight: 700; }
.step.current { border-color: #222; }
.strip-total { margin-left: auto; align-self: center; font-weight: 700; font-size: 1.1rem; }

/* Layout: board + panel */
.play { display: grid; grid-template-columns: minmax(0, 560px) minmax(0, 1fr); gap: 1.5rem; align-items: start; }
.board-wrap { position: relative; width: 100%; }
.board { width: 100%; aspect-ratio: 1 / 1; user-select: none; -webkit-user-select: none; -webkit-tap-highlight-color: transparent; }
.board-svg { display: block; width: 100%; height: auto; touch-action: manipulation; }
.board-svg rect[data-sq] { cursor: pointer; }

/* Pieces: same rules as the site's SVG boards (svg.rs) */
.board-svg .pieces, .board-svg .arrows, .board-svg .dest, .board-svg .hl { pointer-events: none; }
.pc path:nth-child(1), .pc path:nth-child(3) { fill: none; stroke: white; }
.pc path:nth-child(2) { stroke: gray; fill: black; }
.pc path:nth-child(1) { stroke-width: 3; }
.pc path { stroke-linecap: round; }
.pc.w { filter: invert(); }
.piece-icon { width: 40px; height: 40px; display: block; }

.coord { fill: white; font-weight: bold; font-size: 9px; font-family: system-ui, sans-serif; pointer-events: none; }
.hl-from { fill: rgba(255, 230, 80, .55); }
.dest.dot { fill: rgba(20, 20, 20, .35); }
.dest.ring { fill: none; stroke: rgba(20, 20, 20, .4); stroke-width: 4; }
.dest.dot.picked { fill: var(--mine); }
.dest.ring.picked { stroke: var(--mine); }
.arrow { stroke: rgba(0, 0, 0, .35); stroke-width: .6; stroke-linejoin: round; }
.ar-mine { fill: rgba(47, 111, 214, .8); }
.ar-mine-done { fill: rgba(47, 111, 214, .75); }
.ar-best { fill: rgba(30, 160, 60, .88); }
.ar-played { fill: rgba(210, 50, 40, .7); }

.legend { display: flex; flex-wrap: wrap; gap: .3rem 1rem; font-size: .85rem; color: var(--muted); margin-top: .4rem; }
.lg { display: inline-block; width: 1.4em; height: .45em; border-radius: 2px; margin-right: .35em; vertical-align: middle; }
.lg-best { background: rgb(30, 160, 60); }
.lg-mine { background: var(--mine); }
.lg-played { background: rgb(210, 50, 40); }

/* Promotion picker */
.picker {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  background: var(--card); border-radius: 10px; padding: .6rem .8rem; box-shadow: 0 6px 24px rgba(0,0,0,.35);
  text-align: center; z-index: 5;
}
.picker-title { font-weight: 700; margin-bottom: .4rem; }
.picker-row { display: flex; gap: .4rem; }
.picker-btn {
  border: 2px solid var(--line); border-radius: 8px; background: rgb(170,170,170); padding: .2rem;
  cursor: pointer; display: flex; flex-direction: column; align-items: center; font: inherit; font-size: .8rem;
}
.picker-btn.on { border-color: var(--mine); background: #cfe0fb; }
.picker-close { margin-top: .5rem; font: inherit; padding: .25rem .9rem; border-radius: 6px; border: 1px solid var(--line); background: #f3f3f3; cursor: pointer; }

/* Panel */
.panel { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1rem 1.1rem; min-width: 0; }
.to-move { margin: 0 0 .3rem; font-weight: 600; }
.to-move::before { content: ""; display: inline-block; width: .8em; height: .8em; border-radius: 50%; border: 1px solid #555; margin-right: .45em; vertical-align: -.05em; }
.tm-w::before { background: #fff; }
.tm-b::before { background: #222; }
.sel-label { margin-top: .8rem; }
.chips { display: flex; flex-wrap: wrap; gap: .4rem; min-height: 2rem; align-items: center; }
.chip {
  display: inline-flex; align-items: center; gap: .3rem; background: #e7eefb; border: 1px solid #b9cbee;
  border-radius: 999px; padding: .15rem .3rem .15rem .7rem; font-weight: 600;
}
.chip-score { font-weight: 400; font-size: .85rem; padding-right: .4rem; }
.chip-x { border: 0; background: transparent; font-size: 1.1rem; line-height: 1; cursor: pointer; color: #555; padding: .1rem .35rem; border-radius: 999px; }
.chip-x:hover { background: rgba(0,0,0,.1); }
.actions { display: flex; gap: .5rem; margin: 1rem 0 .2rem; }
.btn {
  font: inherit; font-weight: 600; padding: .5rem 1.2rem; border-radius: 8px; border: 1px solid var(--line);
  background: #f6f6f6; cursor: pointer; color: var(--fg);
}
.btn.primary { background: var(--accent); border-color: var(--accent-dark); color: #fff; }
.btn.primary:hover:not(:disabled) { background: var(--accent-dark); }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* Reveal */
.reveal { border-top: 1px solid var(--line); margin-top: 1rem; padding-top: .8rem; }
.big-score { display: flex; align-items: baseline; gap: .4rem; }
.big-num { font-size: 2.6rem; font-weight: 800; line-height: 1; }
.big-of { color: var(--muted); font-weight: 600; }
.verdict { margin: .3rem 0 .6rem; }
.best-line, .game-line, .credit { margin: .3rem 0; }
.credit { font-size: .9rem; color: var(--muted); }
.moves-head { margin-bottom: 0; }
.move-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(5.6rem, 1fr)); gap: .3rem;
  max-height: 22rem; overflow-y: auto; padding: 2px; margin-top: .4rem;
}
.mv {
  border-radius: 6px; padding: .2rem .4rem; display: grid; grid-template-columns: 1fr auto;
  font-size: .85rem; line-height: 1.25; border: 2px solid transparent;
}
.mv.mine { border-color: #1d3f7a; }
.mv-san { font-weight: 700; }
.mv-score { font-weight: 700; text-align: right; }
.mv-eval { grid-column: 1 / -1; color: #333; font-size: .78rem; font-variant-numeric: tabular-nums; }
.mv-tag { grid-column: 1 / -1; font-size: .7rem; text-transform: uppercase; letter-spacing: .04em; color: #333; }

/* Summary */
.summary { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1rem 1.1rem; margin-top: 1.5rem; }
.sum-total-line { font-size: 1.2rem; margin: .2rem 0 .6rem; }
.share { background: #f6f4f0; border: 1px solid var(--line); border-radius: 6px; padding: .6rem .8rem; white-space: pre-wrap; font-size: .95rem; margin: 0 0 .7rem; }
.copy-status { margin-left: .6rem; color: var(--muted); }

/* How to play */
.how { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: .6rem 1rem; margin-top: 1.5rem; }
.how summary { cursor: pointer; font-weight: 700; }
.how ul { margin: .6rem 0 .2rem; padding-left: 1.2rem; }
.how li { margin: .3rem 0; }

/* Archive */
.days { list-style: none; padding: 0; margin: 1rem 0; }
.day-row { display: flex; align-items: center; gap: .7rem; background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: .6rem .9rem; margin-bottom: .4rem; }
.day-link { font-weight: 700; font-variant-numeric: tabular-nums; }
.day-res { margin-left: auto; }
.day-res.done { font-weight: 700; }
.tag { font-size: .72rem; background: #222; color: #fff; border-radius: 4px; padding: .05rem .4rem; text-transform: uppercase; }

.foot { max-width: 1100px; margin: 1rem auto 2rem; padding: 0 1rem; font-size: .85rem; color: var(--muted); }

@media (max-width: 820px) {
  .play { grid-template-columns: minmax(0, 1fr); gap: 1rem; }
  main { padding: .7rem; }
  .board-col { margin: 0 -.3rem; }
  .panel { padding: .8rem; }
  .top nav { gap: .7rem; }
}