:root {
  --bg: #0f1115;
  --panel: #181c22;
  --panel2: #1f242d;
  --ink: #f2f4f8;
  --muted: #9aa3b2;
  --accent: #ff5c5c;
  --accent2: #ffd166;
  --good: #4ade80;
  --bad: #f87171;
  --line: #2a303b;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
}
header {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 8px; padding: 12px 20px; border-bottom: 1px solid var(--line);
  background: var(--panel);
}
header h1 { margin: 0; font-size: 1.5rem; }
nav { display: flex; gap: 8px; }
main { max-width: 920px; margin: 0 auto; padding: 20px 16px 40px; }
footer { max-width: 920px; margin: 0 auto; padding: 0 16px 24px; color: var(--muted); font-size: 0.85rem; }

.screen { display: none; }
.screen.active { display: block; }
h2 { margin-top: 4px; }
.tagline { font-size: 1.15rem; }
.how { max-width: 640px; }
.fine { color: var(--muted); font-size: 0.92rem; }
.notice {
  background: #2a2113; border: 1px solid var(--accent2); border-radius: 12px;
  padding: 12px 16px; margin: 12px 0;
}

.btn {
  background: var(--panel2); color: var(--ink);
  border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 16px; font-size: 1rem; cursor: pointer;
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 700; }
.btn.big { font-size: 1.1rem; padding: 14px 22px; }
.btn.small { padding: 6px 10px; font-size: 0.9rem; }
.btn.danger { border-color: var(--bad); color: var(--bad); }
.btn:disabled { opacity: 0.45; cursor: default; }

.level-pick { display: flex; flex-wrap: wrap; gap: 12px; margin: 18px 0; }
.level-card {
  flex: 1 1 260px; text-align: left; cursor: pointer;
  background: var(--panel); border: 2px solid var(--line); border-radius: 14px;
  padding: 16px; color: var(--ink); font-family: inherit;
  display: flex; flex-direction: column; gap: 4px;
}
.level-card:hover, .level-card.selected { border-color: var(--accent2); }
.level-num { font-size: 0.85rem; color: var(--accent2); font-weight: 700; text-transform: uppercase; letter-spacing: 1px; }
.level-name { font-size: 1.2rem; font-weight: 700; }
.level-desc { color: var(--muted); font-size: 0.95rem; }

.home-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0; }

.level-tabs { display: flex; gap: 8px; margin: 12px 0; }
.tab-btn {
  background: var(--panel2); color: var(--ink); border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 14px; cursor: pointer; font-size: 0.95rem;
}
.tab-btn.active { border-color: var(--accent2); color: var(--accent2); }

.three-slot {
  background: #0a0d12; border: 1px solid var(--line); border-radius: 14px;
  min-height: 380px; margin: 12px 0; overflow: hidden; position: relative;
}
#three-wrap { position: relative; height: 100%; }
#three-canvas { display: block; width: 100%; height: 380px; touch-action: none; cursor: grab; }
#three-canvas:active { cursor: grabbing; }
.three-controls { position: absolute; top: 10px; left: 10px; display: flex; gap: 6px; }
.finger-btns { position: absolute; top: 10px; right: 10px; display: flex; flex-wrap: wrap; gap: 6px; max-width: 260px; justify-content: flex-end; }
.finger-btns button {
  background: rgba(31,36,45,.9); color: var(--ink); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 10px; cursor: pointer; font-size: 0.85rem;
}
.finger-btns button.lit { border-color: var(--accent2); color: var(--accent2); }
.three-caption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 10px 14px;
  background: linear-gradient(transparent, rgba(0,0,0,.75)); text-align: center;
}
#three-sign-name { font-size: 1.25rem; font-weight: 700; }
#three-sign-cue { color: var(--muted); font-size: 0.95rem; }

.sign-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; margin-top: 12px; }
.sign-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 12px; cursor: pointer; text-align: left; color: var(--ink); font-family: inherit;
}
.sign-card:hover, .sign-card.selected { border-color: var(--accent2); }
.sign-card .sc-name { font-weight: 700; font-size: 1.05rem; }
.sign-card .sc-cue { color: var(--muted); font-size: 0.88rem; }
.sign-card .sc-meta { font-size: 0.8rem; color: var(--accent2); margin-top: 4px; }

.calib-layout { display: flex; flex-wrap: wrap; gap: 16px; }
.calib-preview { flex: 1 1 320px; position: relative; }
.calib-preview video, .calib-preview canvas { width: 100%; border-radius: 12px; display: block; background: #000; }
.calib-preview canvas { position: absolute; top: 0; left: 0; }
.calib-list { flex: 1 1 280px; }
.calib-list ul { list-style: none; padding: 0; margin: 8px 0; }
.calib-list li {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; margin-bottom: 6px;
  cursor: pointer; background: var(--panel);
}
.calib-list li.current { border-color: var(--accent2); }
.calib-list li.done { border-color: var(--good); }
.calib-list li .dots { color: var(--accent2); font-weight: 700; }
.calib-list li.done .dots { color: var(--good); }
.calib-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.status-line { min-height: 1.4em; color: var(--muted); }
.status-line.good { color: var(--good); }
.status-line.bad { color: var(--bad); }

.game-top { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; }
.game-meta { font-size: 1.05rem; }
#game-timer { font-weight: 700; color: var(--accent2); margin-left: 8px; }
.letters { display: flex; gap: 6px; }
.letters span {
  width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center;
  border: 2px solid var(--line); border-radius: 8px; font-weight: 800; color: var(--muted);
}
.letters span.lit { background: var(--accent); border-color: var(--accent); color: #fff; }
.banner {
  text-align: center; font-size: 1.6rem; font-weight: 800; letter-spacing: 2px;
  padding: 12px; border-radius: 12px; margin: 12px 0; background: var(--panel);
}
.banner.watch { color: var(--accent2); }
.banner.copy { color: var(--good); background: #12291a; }
.banner.fail { color: #fff; background: var(--accent); }
.game-sign-name { font-size: 1.4rem; font-weight: 700; text-align: center; }
.ticks { display: flex; gap: 8px; justify-content: center; margin: 8px 0; flex-wrap: wrap; }
.ticks span {
  min-width: 30px; height: 30px; padding: 0 6px; display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--line); border-radius: 8px; color: var(--muted); font-size: 0.9rem;
}
.ticks span.done { background: var(--good); color: #06210f; border-color: var(--good); font-weight: 700; }
.ticks span.current { border-color: var(--accent2); color: var(--accent2); }
.game-preview { position: relative; max-width: 420px; margin: 12px auto 0; }
.game-preview video, .game-preview canvas { width: 100%; border-radius: 12px; display: block; background: #000; }
.game-preview canvas { position: absolute; top: 0; left: 0; }

.score-card { display: flex; gap: 16px; flex-wrap: wrap; margin: 16px 0; }
.score-card > div {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 20px; text-align: center; flex: 1 1 140px;
}
.score-num { display: block; font-size: 2rem; font-weight: 800; color: var(--accent2); }
.score-label { color: var(--muted); font-size: 0.9rem; }
.save-score { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px; margin: 12px 0; }
.save-score input, #board-code, #challenge-link {
  background: var(--panel2); color: var(--ink); border: 1px solid var(--line);
  border-radius: 8px; padding: 10px; font-size: 1rem;
}
#challenge-link { width: min(420px, 90%); }
.challenge-out { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-top: 14px; }
.challenge-code { font-size: 1.6rem; font-weight: 800; color: var(--accent2); letter-spacing: 2px; }
#board-out table { width: 100%; border-collapse: collapse; margin-top: 10px; }
#board-out td, #board-out th { border-bottom: 1px solid var(--line); padding: 8px 6px; text-align: left; }
#board-out td.num { text-align: right; }