/* Marble Run: a warm wooden toy on soft lilac. Deliberately no dark green or teal. */
:root {
  --bg: #f8f6fc;
  --card: #ffffff;
  --ink: #2c2638;
  --ink-2: #605873;
  --rule: #e4def0;
  --accent: #5b4fb0;        /* white text on this is 7:1 */
  --accent-ink: #ffffff;
  --accent-soft: #ebe7fa;
  --focus: #5b4fb0;
  --shadow: 0 1px 2px rgb(44 38 56 / .06), 0 8px 24px rgb(44 38 56 / .07);
  --font: 'Atkinson Hyperlegible', system-ui, -apple-system, 'Segoe UI', sans-serif;
  /* board (read by the canvas) */
  --board: #fffaf4;
  --dot: #eadfd2;
  --tray-band: #f1e6f3;
  --wood: #e8c49c;
  --wood-edge: #b88d63;
  --post: #b9b0c6;
  --peach: #f3b48f;
  --lilac: #a99be8;
  --sky: #8fbde4;
  --plum: #9b7fc4;
  --lift: #b6a9e0;
  --sel: #5b4fb0;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17151d;
    --card: #221f2a;
    --ink: #f1eef8;
    --ink-2: #c7c0d6;
    --rule: #3a3547;
    --accent: #b9aef5;
    --accent-ink: #1b1630;
    --accent-soft: #332d4a;
    --focus: #b9aef5;
    --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 8px 24px rgb(0 0 0 / .3);
    --board: #221e2b;
    --dot: #37314a;
    --tray-band: #2c2538;
    --wood: #c9a176;
    --wood-edge: #8c6a49;
    --post: #6f6784;
    --peach: #d99a78;
    --lilac: #9486d6;
    --sky: #6f9fcb;
    --plum: #8c73b6;
    --lift: #6d62a0;
    --sel: #b9aef5;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 1.0625rem/1.55 var(--font);
  padding-inline: clamp(16px, 3vw, 32px);
}
a { color: inherit; text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 6px; }
[hidden] { display: none !important; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; margin: 0; }

.top { max-width: 1180px; margin: 0 auto; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; padding-block: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.25rem; }
.brand img { border-radius: 9px; }
.home-link { text-decoration: none; font-weight: 700; font-size: .95rem; padding: 8px 14px; border: 1px solid var(--rule); border-radius: 999px; background: var(--card); white-space: nowrap; }

main { max-width: 1180px; margin: 0 auto; display: grid; gap: 14px; padding-bottom: 28px; }
.lead { margin: 4px 0 0; font-size: clamp(1.05rem, 2.2vw, 1.2rem); max-width: 70ch; }
.hint { margin: 0; padding: 10px 14px; border-radius: 12px; background: var(--accent-soft); max-width: 70ch; }
.card { background: var(--card); border: 1px solid var(--rule); border-radius: 18px; padding: 18px 20px; box-shadow: var(--shadow); }
.help { margin: 4px 0 12px; color: var(--ink-2); font-size: .95rem; }

.btn {
  font: 700 1rem/1.2 var(--font); color: var(--ink); background: var(--card);
  border: 2px solid var(--rule); border-radius: 12px; padding: 10px 14px; min-height: 48px; cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: .45; cursor: default; border-color: var(--rule); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.quiet { color: var(--ink-2); }
.btn.toggle[aria-pressed="true"] { background: var(--accent-soft); border-color: var(--accent); }
.btn .ico { display: inline-block; width: 1.1em; margin-inline-end: 6px; }
#sound[aria-pressed="false"] .ico::before { content: '🔇'; }
#sound[aria-pressed="true"] .ico::before { content: '🔔'; }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; }
input[type=text] {
  font: 400 1.05rem/1.3 var(--font); color: var(--ink); background: var(--bg);
  border: 2px solid var(--rule); border-radius: 12px; padding: 9px 12px; min-height: 48px; width: min(260px, 100%);
}
input:focus { border-color: var(--accent); outline: none; }
label > span { display: block; font-weight: 700; font-size: .92rem; margin-bottom: 4px; }

/* controls above the board */
.controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.controls .sep { width: 1px; align-self: stretch; background: var(--rule); margin-inline: 2px; }
.count { color: var(--ink-2); font-size: .95rem; font-variant-numeric: tabular-nums; margin-inline-start: auto; white-space: nowrap; }

/* tray + board */
.stage { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 16px; align-items: start; }
.tray { background: var(--card); border: 1px solid var(--rule); border-radius: 18px; padding: 14px; box-shadow: var(--shadow); }
.tray h2 { margin: 0; font-size: 1.05rem; }
.tray-list { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.piece-btn {
  display: grid; justify-items: center; gap: 2px; padding: 8px 4px; min-height: 76px;
  font: 700 .85rem/1.15 var(--font); color: var(--ink); text-align: center;
  background: var(--bg); border: 2px solid var(--rule); border-radius: 14px; cursor: grab;
  touch-action: pan-x; user-select: none; -webkit-user-select: none;
}
.piece-btn:hover { border-color: var(--accent); }
.piece-btn svg { width: 40px; height: 40px; }
.board-wrap { position: relative; display: flex; justify-content: center; }
#board {
  display: block; border-radius: 16px; border: 1px solid var(--rule); box-shadow: var(--shadow);
  touch-action: none; background: var(--board); cursor: default;
}
#board:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.keys { margin: 0; color: var(--ink-2); font-size: .88rem; }

/* toolbar for the chosen piece, floating near it */
.sel {
  position: absolute; z-index: 5; display: flex; gap: 6px; padding: 6px; border-radius: 14px;
  background: var(--card); border: 1px solid var(--rule); box-shadow: 0 6px 24px rgb(0 0 0 / .18);
}
.sel button {
  font: 700 1rem/1 var(--font); color: var(--ink); background: var(--bg); border: 2px solid var(--rule);
  border-radius: 10px; min-width: 44px; min-height: 44px; padding: 0 10px; cursor: pointer;
}
.sel button:hover { border-color: var(--accent); }
.sel .danger { color: #a33a52; }
@media (prefers-color-scheme: dark) { .sel .danger { color: #f2a1b6; } }

/* builds panel */
.panel summary { font-weight: 700; font-size: 1.1rem; cursor: pointer; min-height: 32px; }
.panel h3 { margin: 16px 0 8px; font-size: 1rem; }
.saves { list-style: none; margin: 0 0 12px; padding: 0; display: grid; gap: 8px; }
.saves li { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; padding: 8px 10px; border: 1px solid var(--rule); border-radius: 12px; }
.saves .name { font-weight: 700; flex: 1 1 10rem; overflow-wrap: anywhere; }
.saves .btn { min-height: 40px; padding: 6px 12px; }
.saves .none { color: var(--ink-2); border: 0; padding: 0; }
.msg { min-height: 1.4em; margin: 6px 0 0; font-weight: 700; }

.foot { max-width: 1180px; margin: 0 auto; padding-block: 18px 32px; color: var(--ink-2); font-size: .92rem; border-top: 1px solid var(--rule); }
.foot p { margin: 0 0 8px; }

.toast {
  position: fixed; left: 50%; bottom: calc(18px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%);
  background: var(--ink); color: var(--bg); padding: 12px 16px; border-radius: 14px; display: flex; gap: 14px; align-items: center;
  box-shadow: var(--shadow); z-index: 30; max-width: calc(100vw - 32px); font-weight: 700;
}
.toast-btn { font: 700 1rem var(--font); background: transparent; color: var(--accent-soft); border: 2px solid currentColor; border-radius: 10px; padding: 4px 12px; cursor: pointer; min-height: 40px; }

/* phones and narrow windows: board first, pieces in a row underneath */
@media (max-width: 760px) {
  .stage { grid-template-columns: minmax(0, 1fr); }
  .tray { order: 2; padding: 10px; }
  .tray .help { margin-bottom: 8px; }
  .tray-list { display: flex; overflow-x: auto; gap: 8px; padding-bottom: 4px; scroll-snap-type: x proximity; }
  .piece-btn { flex: 0 0 84px; scroll-snap-align: start; }
  .count { margin-inline-start: 0; flex-basis: 100%; }
  .controls .sep { display: none; }
  .controls .btn { padding: 8px 12px; min-height: 44px; font-size: .95rem; }
  .keys { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

/* English | العربية */
:root[lang="ar"] { --font: 'IBM Plex Sans Arabic', 'Atkinson Hyperlegible', system-ui, -apple-system, 'Segoe UI', sans-serif; }
.fb-lang { order: -1; flex-basis: 100%; display: flex; justify-content: flex-end; align-items: center; gap: 4px; font-size: .95rem; color: var(--rule); }
.fb-lang button { font: inherit; font-weight: 700; color: var(--ink-2); background: none; border: 0; border-radius: 999px; padding: 4px 12px; min-height: 36px; cursor: pointer; }
.fb-lang button[lang="ar"] { font-family: 'IBM Plex Sans Arabic', system-ui, sans-serif; font-size: 1.05rem; }
.fb-lang button[lang="en"] { font-family: 'Atkinson Hyperlegible', system-ui, sans-serif; }
.fb-lang button[aria-pressed="true"] { color: var(--ink); background: color-mix(in oklab, var(--accent) 16%, transparent); }
.fb-lang button:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.fb-suggest { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 16px; margin: 0 0 4px; padding: 12px 16px; border: 1px solid var(--rule); border-radius: 14px; background: var(--card); }
.fb-suggest p { margin: 0; display: flex; flex-wrap: wrap; gap: 4px 14px; align-items: baseline; }
.fb-suggest [lang="ar"] { font-family: 'IBM Plex Sans Arabic', system-ui, sans-serif; font-weight: 700; }
.fb-suggest [lang="en"] { font-family: 'Atkinson Hyperlegible', system-ui, sans-serif; color: var(--ink-2); }
.fb-suggest-acts { display: flex; flex-wrap: wrap; gap: 8px; }
.fb-suggest button { font-weight: 700; padding: 8px 16px; border-radius: 999px; cursor: pointer; min-height: 40px; }
.fb-suggest .fb-ar { background: var(--accent); color: var(--accent-ink); border: 0; font-family: 'IBM Plex Sans Arabic', system-ui, sans-serif; }
.fb-suggest .fb-en { background: transparent; color: var(--ink); border: 2px solid var(--rule); }