:root, :root[data-theme="classic"] {
  --bg: #0f1720;
  --panel: #16212d;
  --grid: #1c2a38;
  --text: #e6edf3;
  --muted: #8ea0b2;
  --snake: #3fd17a;
  --snake-double: #f5c542;
  --head: #9ef0b9;
  --food: #ff5d73;
  --accent: #3fd17a;
  --on-accent: #062312;
  --line: #243444;
  --wall: #6b7c8f;
  --power-slow: #5aa9ff;
  --power-double: #f5c542;
  --power-shrink: #c38bff;
  --power-ink: #0f1720;
  --scrim: rgba(15, 23, 32, 0.84);
  color-scheme: dark;
}
:root[data-theme="neon"] {
  --bg: #07060d;
  --panel: #0e0c1a;
  --grid: #151229;
  --text: #f4f1ff;
  --muted: #9d97c2;
  --snake: #00e5ff;
  --snake-double: #ffe600;
  --head: #b8fbff;
  --food: #ff2fb2;
  --accent: #ff2fb2;
  --on-accent: #12000b;
  --line: #2a2550;
  --wall: #5b4dd6;
  --power-slow: #00e5ff;
  --power-double: #ffe600;
  --power-shrink: #9dff00;
  --power-ink: #07060d;
  --scrim: rgba(7, 6, 13, 0.86);
  color-scheme: dark;
}
:root[data-theme="paper"] {
  --bg: #f4f1ea;
  --panel: #fffdf8;
  --grid: #efe9dc;
  --text: #1f2a24;
  --muted: #5d6b63;
  --snake: #2f7d4f;
  --snake-double: #b7791f;
  --head: #174d2f;
  --food: #c8392b;
  --accent: #2f7d4f;
  --on-accent: #ffffff;
  --line: #ddd5c4;
  --wall: #7a6f5d;
  --power-slow: #2b6cb0;
  --power-double: #b7791f;
  --power-shrink: #7b4fb3;
  --power-ink: #ffffff;
  --scrim: rgba(244, 241, 234, 0.88);
  color-scheme: light;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--text); font: 16px/1.4 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
body { display: grid; justify-items: center; padding: 16px; }
.game { width: min(480px, 100%); display: grid; gap: 12px; }
.bar { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.bar h1 { margin: 0; font-size: 24px; letter-spacing: 0.02em; white-space: nowrap; }
.tag { font-size: 13px; font-weight: 600; color: var(--muted); vertical-align: middle; }
.replay-tag { color: var(--on-accent); background: var(--accent); border-radius: 999px; padding: 2px 8px; }
.scores { margin: 0; display: flex; gap: 16px; color: var(--muted); }
.scores strong { color: var(--text); font-variant-numeric: tabular-nums; }
.lvl, .effect { transition: color 0.3s; }
.lvl.up, .lvl.up strong, .effect.up { color: var(--head); }
.effect { margin: -4px 0 0; font-size: 14px; font-weight: 600; color: var(--accent); }
.board-wrap { position: relative; aspect-ratio: 1; border-radius: 12px; overflow: hidden; background: var(--panel); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25); }
canvas { width: 100%; height: 100%; display: block; touch-action: none; }
.overlay { position: absolute; inset: 0; display: grid; place-content: center; justify-items: center; gap: 8px; padding: 16px; background: var(--scrim); text-align: center; overflow-y: auto; }
.overlay .title { margin: 0; font-size: 32px; font-weight: 700; }
.overlay .hint { margin: 0; color: var(--muted); max-width: 340px; }
.actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 8px; }
.actions button { min-height: 44px; padding: 10px 24px; border: 0; border-radius: 999px; background: var(--accent); color: var(--on-accent); font: 600 17px/1 inherit; cursor: pointer; }
.actions .quiet, .name-form:not([hidden]) ~ .actions #start, #watch:not([hidden]) ~ #start { background: transparent; color: var(--text); box-shadow: inset 0 0 0 1px var(--line); }
.name-form, .share-box { display: grid; gap: 6px; width: min(300px, 100%); margin-top: 4px; text-align: left; }
.name-form label, .share-box label { font-size: 14px; color: var(--muted); }
.name-row { display: flex; gap: 8px; }
.name-row input, .share-box input { flex: 1; min-width: 0; min-height: 44px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--text); font: 16px/1.2 inherit; }
.share-box input { font-size: 13px; }
.name-row button { min-height: 44px; padding: 0 18px; border: 0; border-radius: 10px; background: var(--accent); color: var(--on-accent); font: 600 16px/1 inherit; cursor: pointer; }
button:focus-visible, input:focus-visible, a:focus-visible { outline: 3px solid var(--head); outline-offset: 2px; }
.speeds, .themes { display: inline-flex; padding: 3px; gap: 2px; border-radius: 999px; background: var(--bg); box-shadow: inset 0 0 0 1px var(--line); }
.speeds { margin-top: 4px; }
.speeds button, .themes button { min-height: 36px; min-width: 72px; padding: 0 14px; border: 0; border-radius: 999px; background: transparent; color: var(--muted); font: 600 14px/1 inherit; cursor: pointer; }
.speeds button[aria-pressed="true"], .themes button[aria-pressed="true"] { background: var(--panel); color: var(--text); box-shadow: inset 0 0 0 1px var(--accent); }
.pad { display: none; grid-template-columns: repeat(3, 64px); grid-template-rows: repeat(2, 56px); justify-content: center; gap: 8px; }
.pad button { border: 0; border-radius: 12px; background: var(--panel); color: var(--text); font-size: 20px; }
.pad [data-dir="up"] { grid-column: 2; grid-row: 1; }
.pad [data-dir="left"] { grid-column: 1; grid-row: 2; }
.pad [data-dir="down"] { grid-column: 2; grid-row: 2; }
.pad [data-dir="right"] { grid-column: 3; grid-row: 2; }
.panel { background: var(--panel); border-radius: 12px; padding: 12px 16px; }
.panel h2 { margin: 0 0 8px; font-size: 16px; }
.theme-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.theme-row h2 { margin: 0; }
.power-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-size: 14px; }
.power-list li { display: flex; gap: 10px; align-items: baseline; }
.power-list strong { margin-right: 4px; }
.gem { position: relative; flex: none; display: inline-grid; place-items: center; width: 22px; height: 22px; font-size: 12px; font-weight: 700; color: var(--power-ink); }
.gem::before { content: ""; position: absolute; inset: 3px; transform: rotate(45deg); border-radius: 3px; background: var(--gem); z-index: 0; }
.gem { isolation: isolate; } .gem::before { z-index: -1; }
.gem-slow { --gem: var(--power-slow); } .gem-double { --gem: var(--power-double); } .gem-shrink { --gem: var(--power-shrink); }
.note { margin: 8px 0 0; color: var(--muted); font-size: 13px; }
.leaders .empty { margin: 0; color: var(--muted); font-size: 14px; }
.leader-list { list-style: none; margin: 0; padding: 0; display: grid; }
.leader-list li { display: grid; grid-template-columns: 28px minmax(0, 1fr) auto auto; grid-template-areas: "rank who points watch" "rank meta meta watch"; column-gap: 8px; align-items: center; padding: 6px 0; border-top: 1px solid var(--line); }
.leader-list li:first-child { border-top: 0; }
.leader-list .rank { grid-area: rank; color: var(--muted); font-variant-numeric: tabular-nums; }
.leader-list .who { grid-area: who; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.leader-list .points { grid-area: points; font-weight: 700; font-variant-numeric: tabular-nums; }
.leader-list .meta { grid-area: meta; color: var(--muted); font-size: 13px; }
.leader-list .watch { grid-area: watch; display: inline-grid; place-items: center; min-height: 36px; padding: 0 12px; border-radius: 999px; color: var(--text); text-decoration: none; font-size: 14px; font-weight: 600; box-shadow: inset 0 0 0 1px var(--line); }
.leader-list .fresh .who, .leader-list .fresh .points { color: var(--accent); }
.foot { color: var(--muted); font-size: 13px; text-align: center; }
@media (pointer: coarse) { .pad { display: grid; } }
@media (max-width: 420px) { .scores { gap: 10px; font-size: 15px; } .speeds button, .themes button { min-width: 0; } }