:root {
  color-scheme: dark;
  --bg: #09090b;
  --panel: #151518;
  --panel-2: #1b1b20;
  --line: #2b2b31;
  --text: #f5f5f7;
  --muted: #9a9aa3;
  --accent: #f59e0b;
  --accent-2: #fb7185;
  --shadow: 0 18px 60px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: radial-gradient(circle at top, #1b1621 0, var(--bg) 36%); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: var(--text); }
body { padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom); }
button, select, input { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }

.app-shell { width: min(100%, 720px); margin: 0 auto; padding: 20px 16px 26px; }
.topbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.eyebrow { margin: 0 0 2px; font-size: .69rem; letter-spacing: .18em; color: var(--accent); font-weight: 800; }
h1 { margin: 0; font-size: 2rem; line-height: 1; letter-spacing: -.05em; }

.card { border: 1px solid var(--line); background: linear-gradient(145deg, rgba(29,29,34,.96), rgba(18,18,21,.96)); border-radius: 22px; box-shadow: var(--shadow); }
.tempo-card { padding: 26px 18px 18px; text-align: center; }
.tempo-display { font-size: clamp(5rem, 20vw, 8.5rem); line-height: .82; font-weight: 900; letter-spacing: -.08em; font-variant-numeric: tabular-nums; }
.tempo-label { margin-top: 10px; font-size: .78rem; letter-spacing: .18em; color: var(--muted); font-weight: 800; }

.beat-lights { display: flex; justify-content: center; gap: 10px; margin: 22px 0 18px; min-height: 14px; }
.beat-light { width: 12px; height: 12px; border-radius: 999px; background: #323239; transition: transform .08s ease, background .08s ease, box-shadow .08s ease; }
.beat-light.active { transform: scale(1.35); background: var(--accent); box-shadow: 0 0 18px rgba(245,158,11,.85); }
.beat-light.accent.active { background: var(--accent-2); box-shadow: 0 0 18px rgba(251,113,133,.85); }

input[type="range"] { width: 100%; accent-color: var(--accent); }
.tempo-slider { margin: 4px 0 16px; }
.tempo-actions { display: grid; grid-template-columns: 1fr 1fr 1.4fr 1fr 1fr; gap: 8px; }
.small-btn, .tap-btn, .sound-chip, .toggle, .preset, .icon-btn { border: 1px solid var(--line); color: var(--text); background: var(--panel-2); cursor: pointer; }
.small-btn, .tap-btn { min-height: 48px; border-radius: 14px; font-weight: 800; }
.tap-btn { background: rgba(245,158,11,.12); color: #ffc85c; border-color: rgba(245,158,11,.32); letter-spacing: .08em; }
.small-btn:active, .tap-btn:active, .preset:active, .sound-chip:active, .icon-btn:active { transform: scale(.97); }

.controls-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 12px 0; }
.control-card { padding: 16px; box-shadow: none; }
.control-card label, .label-row span { font-size: .78rem; color: var(--muted); font-weight: 700; }
.control-card select { margin-top: 8px; width: 100%; border-radius: 12px; border: 1px solid var(--line); background: #111114; color: var(--text); padding: 11px; }
.label-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }

.sound-card, .presets-card { padding: 18px; margin-top: 12px; box-shadow: none; }
.sound-header, .preset-header { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.section-title { margin: 0; font-size: .96rem; font-weight: 850; }
.section-copy { margin: 4px 0 0; color: var(--muted); font-size: .78rem; }
.toggle, .sound-chip { border-radius: 999px; padding: 9px 13px; font-size: .78rem; font-weight: 800; }
.toggle.active, .sound-chip.active { background: var(--accent); color: #18120a; border-color: transparent; }
.sound-options { display: flex; gap: 8px; margin-top: 16px; flex-wrap: wrap; }

.preset-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 16px; }
.preset { text-align: left; padding: 14px; border-radius: 16px; }
.preset strong, .preset span { display: block; }
.preset strong { margin-bottom: 4px; }
.preset span { color: var(--muted); font-size: .76rem; }

.session-row { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 14px; margin-top: 18px; }
.session-stat { justify-self: start; }
.session-label { display: block; font-size: .7rem; color: var(--muted); margin-bottom: 3px; }
.session-stat strong { font-variant-numeric: tabular-nums; }
.play-btn { width: 146px; height: 64px; border: none; border-radius: 20px; background: linear-gradient(135deg, var(--accent), #f97316); color: #1b1207; font-weight: 950; letter-spacing: .06em; display: flex; align-items: center; justify-content: center; gap: 10px; cursor: pointer; box-shadow: 0 15px 40px rgba(245,158,11,.22); }
.play-btn.playing { background: linear-gradient(135deg, #fb7185, #ef4444); color: #fff; }
.icon-btn { width: 44px; height: 44px; border-radius: 14px; font-size: 1.1rem; justify-self: end; }
.icon-btn.active { color: var(--accent); border-color: rgba(245,158,11,.5); background: rgba(245,158,11,.1); }
.shortcut-hint { text-align: center; color: #66666f; font-size: .7rem; margin: 18px 0 0; }

@media (max-width: 520px) {
  .controls-grid { grid-template-columns: 1fr; }
  .preset-grid { grid-template-columns: 1fr; }
  .app-shell { padding-left: 12px; padding-right: 12px; }
  .tempo-actions { gap: 6px; }
  .small-btn, .tap-btn { min-height: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}