:root {
  --bg: #09111f;
  --bg-glow: #162c42;
  --panel: rgba(20, 33, 51, 0.82);
  --panel-alt: rgba(34, 51, 73, 0.7);
  --board: #07101c;
  --text: #eff7ff;
  --muted: #8da2ba;
  --accent: #00bbff;
  --accent-2: #62ddff;
  --line: rgba(160, 214, 255, 0.18);
  --grid: rgba(255, 255, 255, 0.065);
  --shadow: rgba(0, 0, 0, 0.42);
  --radius: 18px;
}

html[data-appearance="light"] {
  --bg: #e8f0f5;
  --bg-glow: #c5e2e9;
  --panel: rgba(255, 255, 255, 0.78);
  --panel-alt: rgba(226, 237, 243, 0.88);
  --board: #d9e8ee;
  --text: #142538;
  --muted: #5e7487;
  --line: rgba(28, 70, 97, 0.16);
  --grid: rgba(34, 73, 94, 0.1);
  --shadow: rgba(35, 64, 80, 0.18);
}

@media (prefers-color-scheme: light) {
  html[data-appearance="auto"] {
    --bg: #e8f0f5;
    --bg-glow: #c5e2e9;
    --panel: rgba(255, 255, 255, 0.78);
    --panel-alt: rgba(226, 237, 243, 0.88);
    --board: #d9e8ee;
    --text: #142538;
    --muted: #5e7487;
    --line: rgba(28, 70, 97, 0.16);
    --grid: rgba(34, 73, 94, 0.1);
    --shadow: rgba(35, 64, 80, 0.18);
  }
}

html[data-ui="neon"] { --accent: #00bbff; --accent-2: #62ddff; --bg-glow: #123b61; }

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: start center;
  padding: 22px;
  background: radial-gradient(circle at 50% -10%, var(--bg-glow) 0%, var(--bg) 52%);
  color: var(--text);
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  transition: background 0.35s ease, color 0.35s ease;
}

.game-shell {
  width: min(880px, 100%);
  padding: 24px;
  border-radius: 24px;
  background: var(--panel);
  box-shadow: 0 20px 50px var(--shadow);
  border: 1px solid var(--line);
  backdrop-filter: blur(22px);
  animation: rise-in 0.6s ease both;
}

.topbar, .mode-bar, .game-layout, .footer-hint { display: flex; }
.topbar { align-items: center; justify-content: space-between; margin-bottom: 28px; }
.brand-lockup { display: flex; align-items: center; gap: 12px; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; border: 1px solid var(--accent); color: var(--accent); font-size: 1.7rem; font-weight: 900; box-shadow: 0 0 16px color-mix(in srgb, var(--accent) 30%, transparent); }
.eyebrow, .panel-heading, .mode-label, .footer-hint, .appearance-state { margin: 0; color: var(--muted); font-size: 0.66rem; letter-spacing: 0.16em; font-weight: 700; }
h1 { margin: 2px 0 0; letter-spacing: 0.12em; font-size: 2rem; line-height: 1; }
.top-actions { display: flex; gap: 8px; }
.icon-btn, .mode-btn, .touch-btn { border: 1px solid var(--line); color: var(--text); background: var(--panel-alt); cursor: pointer; transition: 0.18s ease; }
.icon-btn { display: inline-grid; place-items: center; width: 40px; height: 40px; padding: 0; border-radius: 50%; font-size: 1.15rem; line-height: 1; }
.icon-btn:hover, .mode-btn:hover, .touch-btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.mode-bar { align-items: center; gap: 14px; margin: 24px 0 18px; padding: 8px; border-bottom: 1px solid var(--line); }
.mode-switcher { display: flex; gap: 5px; flex: 1; }
.mode-btn { padding: 7px 12px; border-radius: 7px; font-size: 0.72rem; }
.mode-btn.is-active { background: var(--accent); color: var(--bg); border-color: var(--accent); font-weight: 700; }
.appearance-state { color: var(--accent); }
.game-layout { justify-content: center; align-items: flex-start; gap: 30px; }

.side-panel { width: 300px; display: flex; flex-direction: column; gap: 12px; }
.panel-heading { display: flex; justify-content: space-between; align-items: center; }
.live-dot { color: var(--accent); font-size: 0.58rem; }
.live-dot::before { content: ""; display: inline-block; width: 6px; height: 6px; margin-right: 5px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; }
.stat-box, .next-box { background: var(--panel-alt); border: 1px solid var(--line); border-radius: 12px; }
.stat-box { padding: 11px 8px; text-align: center; }
.stat-box span { display: block; color: var(--muted); font-size: 0.67rem; }
.stat-box strong { display: block; margin-top: 5px; color: var(--text); font-size: 1.2rem; }
.next-box { padding: 13px; }
#next { display: block; width: 120px; height: 120px; margin: 12px auto 2px; background: var(--board); border: 1px solid var(--line); border-radius: 10px; }
.mini-key { padding: 3px 6px; border: 1px solid var(--line); border-radius: 4px; font-size: 0.55rem; }
.primary-btn { display: flex; align-items: center; justify-content: space-between; padding: 13px 15px; border: 0; border-radius: 11px; background: var(--accent); color: var(--bg); font-weight: 800; cursor: pointer; }
.primary-btn b { font-size: 1.1rem; }
.primary-btn:hover { filter: brightness(1.1); transform: translateY(-1px); }
.audio-note { margin: 2px 0 0; color: var(--muted); text-align: center; font-size: 0.72rem; }
.ad-slot { display: flex; justify-content: center; overflow: hidden; }
.ad-pc { width: 300px; min-height: 250px; margin-top: 8px; border: 1px solid var(--line); border-radius: 10px; background: rgba(3, 12, 24, 0.3); }
.ad-sp { display: none; width: 320px; min-height: 50px; margin: 18px auto 0; }
.board-wrap { width: 300px; }
.board-header { display: flex; justify-content: space-between; padding: 0 2px 8px; color: var(--muted); font-size: 0.65rem; letter-spacing: 0.16em; font-weight: 700; }
#pause-label { color: var(--accent); }
.board-stage { position: relative; width: 300px; }
#board { display: block; width: 300px; height: 600px; background: var(--board); border: 2px solid var(--line); border-radius: 12px; box-shadow: 0 0 24px color-mix(in srgb, var(--accent) 12%, transparent), inset 0 0 18px rgba(255,255,255,0.04); }
.game-over-panel { position: absolute; inset: 2px; display: grid; place-content: center; justify-items: center; gap: 12px; border-radius: 10px; background: linear-gradient(180deg, rgba(4, 17, 31, 0.82), rgba(4, 12, 24, 0.96)); color: var(--text); text-align: center; backdrop-filter: blur(5px); }
.game-over-panel[hidden] { display: none; }
.game-over-kicker { color: var(--accent); font-size: 0.68rem; font-weight: 800; letter-spacing: 0.28em; }
.game-over-panel strong { color: var(--accent); font-size: clamp(1.8rem, 7vw, 2.55rem); letter-spacing: 0.12em; text-shadow: 0 0 18px color-mix(in srgb, var(--accent) 75%, transparent); }
.game-over-score { color: var(--muted); font-size: 0.75rem; letter-spacing: 0.16em; }.game-over-score b { margin-left: 6px; color: var(--text); font-size: 1.15rem; }
.game-over-panel button { min-width: 150px; padding: 11px 15px; border: 1px solid var(--accent); border-radius: 8px; background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); font-weight: 800; cursor: pointer; }.game-over-panel button b { margin-left: 16px; }
.touch-controls { display: none; grid-template-columns: repeat(5, 1fr); gap: 6px; margin-top: 10px; }
.touch-btn { min-height: 42px; border-radius: 8px; font-size: 1.2rem; touch-action: manipulation; }
.touch-rotate { color: var(--accent); }.touch-drop { font-size: 0.65rem; letter-spacing: 0.08em; }
.footer-hint { justify-content: center; gap: 22px; margin-top: 22px; }
.controls-dialog { width: min(360px, calc(100vw - 32px)); padding: 22px; border: 1px solid var(--accent); border-radius: 16px; background: #0b1b2d; color: var(--text); box-shadow: 0 0 35px color-mix(in srgb, var(--accent) 24%, transparent); }
.controls-dialog::backdrop { background: rgba(0, 8, 18, 0.72); backdrop-filter: blur(4px); }
.dialog-head { display: flex; justify-content: space-between; color: var(--accent); font-size: 0.68rem; font-weight: 800; letter-spacing: 0.2em; }.dialog-close { border: 0; background: none; color: var(--muted); font-size: 1.6rem; line-height: 1; cursor: pointer; }.controls-dialog h2 { margin: 18px 0; font-size: 1.55rem; }.control-list { display: grid; gap: 11px; }.control-list div { display: flex; align-items: center; gap: 8px; color: var(--muted); }.control-list div span { margin-left: 5px; }.control-list kbd { min-width: 32px; padding: 5px 8px; border: 1px solid var(--line); border-bottom: 2px solid var(--accent); border-radius: 5px; color: var(--text); text-align: center; font: 700 0.7rem "Trebuchet MS", sans-serif; }

html[data-ui="neon"] .game-shell { box-shadow: 0 0 30px color-mix(in srgb, var(--accent) 15%, transparent), 0 20px 50px var(--shadow); }
html[data-ui="neon"] .icon-btn, html[data-ui="neon"] .mode-btn, html[data-ui="neon"] .stat-box, html[data-ui="neon"] .next-box { box-shadow: 0 0 12px color-mix(in srgb, var(--accent) 18%, transparent); }

@keyframes rise-in { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 680px) {
  body { padding: 10px; place-items: start center; }
  .game-shell { padding: 17px 12px 14px; border-radius: 18px; }
  .mode-bar { gap: 8px; margin: 18px 0 14px; overflow-x: auto; }
  .mode-switcher { min-width: max-content; }
  .mode-label { display: none; }
  .game-layout { flex-direction: column-reverse; align-items: center; gap: 15px; }
  .side-panel { width: 100%; max-width: 300px; }
  .ad-pc { display: none; }
  .ad-sp { display: flex; max-width: 100%; }
  .board-wrap, .board-stage, #board { width: min(86vw, 300px); }
  #board { height: auto; aspect-ratio: 1 / 2; }
  .touch-controls { display: grid; }
  .footer-hint { display: none; }
}