/* ── AirKeys — dark night-sky aesthetic ─────────────────────────── */
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

:root {
  --ink: #eef2ff;
  --dim: #8b93b8;
  --bg0: #04050f;
  --bg1: #0b1026;
  --cyan: #38bdf8;
  --gold: #fbbf24;
  --glass: rgba(18, 24, 52, 0.72);
  --line: rgba(130, 150, 220, 0.16);
}

html, body { height: 100%; overflow: hidden; }
body {
  font-family: ui-rounded, -apple-system, 'SF Pro Rounded', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg0);
  color: var(--ink);
  user-select: none;
}

#stage {
  position: fixed; inset: 0;
  width: 100vw; height: 100vh;
  display: block;
  background: var(--bg0);
}

.hidden { display: none !important; }
.dim { color: var(--dim); }
.small { font-size: 12px; }

/* ── screens ────────────────────────────────────────────────────── */
.screen {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  overflow-y: auto;
  z-index: 10;
}

#screen-menu {
  background:
    radial-gradient(1100px 500px at 80% -10%, rgba(56, 90, 220, 0.22), transparent 60%),
    radial-gradient(900px 500px at 10% 40%, rgba(140, 60, 200, 0.14), transparent 60%),
    radial-gradient(2px 2px at 20% 30%, rgba(255,255,255,.7), transparent 40%),
    radial-gradient(2px 2px at 70% 20%, rgba(255,255,255,.6), transparent 40%),
    radial-gradient(1.5px 1.5px at 40% 70%, rgba(255,255,255,.5), transparent 40%),
    radial-gradient(2px 2px at 90% 60%, rgba(255,255,255,.55), transparent 40%),
    radial-gradient(1.5px 1.5px at 55% 15%, rgba(255,255,255,.5), transparent 40%),
    radial-gradient(2px 2px at 15% 85%, rgba(255,255,255,.4), transparent 40%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
}

.menu-inner {
  width: min(1060px, 94vw);
  padding: 42px 0 32px;
  margin: auto;
}

.brand h1 {
  font-size: clamp(44px, 7vw, 76px);
  font-weight: 800;
  letter-spacing: 0.06em;
  background: linear-gradient(95deg, #7dd3fc 0%, #38bdf8 35%, #c4b5fd 70%, #fbbf24 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 26px rgba(56, 189, 248, 0.35));
}
.brand h1 span { font-weight: 300; }
.tagline { color: var(--dim); margin: 6px 2px 26px; font-size: 15px; }

.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.chip {
  padding: 7px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--dim);
  font-size: 13px; font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.chip:hover { color: var(--ink); border-color: rgba(130, 150, 220, 0.4); }
.chip.on { background: rgba(56, 189, 248, 0.16); color: #aee6ff; border-color: rgba(56, 189, 248, 0.55); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(232px, 1fr));
  gap: 14px;
}

.card {
  position: relative;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px 16px 14px;
  backdrop-filter: blur(8px);
  transition: transform 0.16s, border-color 0.16s, box-shadow 0.16s;
}
.card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 60%, transparent);
  box-shadow: 0 12px 38px -14px color-mix(in srgb, var(--accent) 55%, transparent);
}
.card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.genre-tag {
  font-size: 10.5px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  padding: 3px 9px; border-radius: 999px;
}
.card h3 { font-size: 17.5px; margin-bottom: 2px; }
.artist { color: var(--dim); font-size: 12.5px; margin-bottom: 12px; }
.card-meta {
  display: flex; justify-content: space-between;
  color: var(--dim); font-size: 12px; margin-bottom: 12px;
}
.dots { color: var(--accent); letter-spacing: 2px; font-size: 10px; }
.card-actions { display: flex; gap: 8px; }
.card-actions .preview {
  width: 38px; border-radius: 11px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  color: var(--ink); cursor: pointer; font-size: 13px;
}
.card-actions .preview:hover { background: rgba(255, 255, 255, 0.12); }
.card-actions .play {
  flex: 1; padding: 9px 0;
  border-radius: 11px; border: none;
  background: linear-gradient(120deg, color-mix(in srgb, var(--accent) 80%, #fff 0%), var(--accent));
  color: #0a0f1e; font-weight: 800; letter-spacing: 0.08em; font-size: 13px;
  cursor: pointer;
  transition: filter 0.15s, transform 0.1s;
}
.card-actions .play:hover { filter: brightness(1.15); }
.card-actions .play:active { transform: scale(0.97); }

.best-badge {
  font-size: 13px; font-weight: 800;
  width: 26px; height: 26px; border-radius: 8px;
  display: grid; place-items: center;
}

.menu-foot { display: flex; gap: 10px; margin-top: 26px; flex-wrap: wrap; }

/* ── buttons / panels ───────────────────────────────────────────── */
.btn {
  padding: 12px 22px;
  border-radius: 13px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.07);
  color: var(--ink);
  font-size: 14.5px; font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}
.btn:hover { background: rgba(255, 255, 255, 0.13); }
.btn.glow {
  background: linear-gradient(120deg, #38bdf8, #818cf8);
  border: none; color: #061021;
  box-shadow: 0 6px 30px -8px rgba(86, 140, 250, 0.7);
}
.btn.glow:hover { filter: brightness(1.12); }
.btn.ghost { background: transparent; }
.btn.ghost:hover { background: rgba(255, 255, 255, 0.07); }
.small-btn { padding: 7px 14px; font-size: 12.5px; }
.btn-col { display: flex; flex-direction: column; gap: 10px; margin-top: 22px; }

.overlay {
  position: fixed; inset: 0; z-index: 40;
  background: rgba(3, 5, 14, 0.72);
  backdrop-filter: blur(7px);
  display: flex; align-items: center; justify-content: center;
}
.panel {
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 34px 38px;
  width: min(420px, 92vw);
  max-height: 88vh; overflow-y: auto;
  text-align: center;
  box-shadow: 0 30px 90px -30px rgba(0, 0, 0, 0.9);
}
.panel.wide { width: min(560px, 94vw); text-align: left; }
.panel h2 { margin-bottom: 14px; font-size: 24px; }
.panel.wide h2 { margin-bottom: 20px; }

/* ── warmup ─────────────────────────────────────────────────────── */
#screen-warmup { z-index: 12; pointer-events: none; }
.warm-card {
  pointer-events: auto;
  background: rgba(8, 12, 30, 0.62);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 30px 38px;
  text-align: center;
  width: min(430px, 92vw);
  backdrop-filter: blur(6px);
}
.warm-icon { font-size: 54px; margin-bottom: 12px; animation: bob 1.6s ease-in-out infinite; }
@keyframes bob { 50% { transform: translateY(-7px); } }
.warm-card h2 { font-size: 21px; margin-bottom: 8px; }
.warm-card .dim { margin-bottom: 8px; }
.warm-card .btn { margin-top: 14px; }

/* ── HUD ────────────────────────────────────────────────────────── */
#hud, #free-hud { position: fixed; inset: 0; z-index: 20; pointer-events: none; }
#progress {
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: rgba(255, 255, 255, 0.07);
}
#progress i {
  display: block; height: 100%; width: 0%;
  background: linear-gradient(90deg, #38bdf8, #a78bfa);
  box-shadow: 0 0 12px rgba(99, 160, 255, 0.8);
  transition: width 0.2s linear;
}
.hud-row {
  position: absolute; top: 10px; left: 0; right: 0;
  display: flex; justify-content: space-between; align-items: center;
  padding: 4px 18px;
  font-size: 13.5px; color: var(--dim);
}
.hud-right { display: flex; align-items: center; gap: 16px; pointer-events: auto; }
#hud-score { font-size: 19px; font-weight: 800; color: var(--ink); min-width: 70px; text-align: right; }
#hud-acc { font-variant-numeric: tabular-nums; }
#btn-pause, #free-exit {
  pointer-events: auto;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--line);
  color: var(--ink);
  width: 36px; height: 36px; border-radius: 10px;
  cursor: pointer; font-size: 14px;
}
#free-exit { width: auto; }
#btn-pause:hover { background: rgba(255, 255, 255, 0.16); }

#combo {
  position: absolute; top: 13%; left: 0; right: 0;
  text-align: center;
  font-size: 64px; font-weight: 800;
  color: rgba(255, 255, 255, 0.92);
  text-shadow: 0 0 30px rgba(120, 180, 255, 0.65);
}
#combo.fire { color: #ffd166; text-shadow: 0 0 36px rgba(255, 170, 60, 0.9); }
#combo.pop { animation: pop 0.18s ease-out; }
@keyframes pop { 0% { transform: scale(1.28); } 100% { transform: scale(1); } }

#judge {
  position: absolute; top: 26%; left: 0; right: 0;
  text-align: center;
  font-size: 30px; font-weight: 800; letter-spacing: 0.14em;
  opacity: 0;
  transition: opacity 0.12s;
}
#judge.show { opacity: 1; animation: judgepop 0.42s ease-out; }
#judge.perfect { color: #7ff7d4; text-shadow: 0 0 26px rgba(60, 255, 190, 0.8); }
#judge.great { color: #7cc7ff; text-shadow: 0 0 22px rgba(80, 170, 255, 0.8); }
#judge.good { color: #c9b8ff; text-shadow: 0 0 18px rgba(170, 140, 255, 0.7); }
#judge.miss { color: #ff7b8a; text-shadow: 0 0 18px rgba(255, 80, 110, 0.7); }
@keyframes judgepop {
  0% { transform: scale(0.7) translateY(8px); }
  35% { transform: scale(1.12) translateY(0); }
  100% { transform: scale(1); }
}

.free-note {
  font-size: 22px; font-weight: 800; color: #aee6ff;
  min-width: 54px; text-align: center;
  text-shadow: 0 0 18px rgba(56, 189, 248, 0.8);
}
.free-note.pop { animation: pop 0.16s ease-out; }

/* ── results ────────────────────────────────────────────────────── */
#screen-results { z-index: 30; background: rgba(3, 5, 14, 0.55); backdrop-filter: blur(5px); }
.results #res-grade {
  font-size: 110px; font-weight: 900; line-height: 1.05;
  margin: 6px 0 2px;
}
.grade-S { color: #ffd700; text-shadow: 0 0 46px rgba(255, 200, 40, 0.75); }
.grade-A { color: #4ade80; text-shadow: 0 0 38px rgba(74, 222, 128, 0.6); }
.grade-B { color: #38bdf8; text-shadow: 0 0 34px rgba(56, 189, 248, 0.6); }
.grade-C { color: #fb923c; text-shadow: 0 0 30px rgba(251, 146, 60, 0.55); }
.grade-D { color: #f87171; text-shadow: 0 0 30px rgba(248, 113, 113, 0.55); }
.best-badge.grade-S { background: rgba(255, 215, 0, 0.14); }
.best-badge.grade-A { background: rgba(74, 222, 128, 0.13); }
.best-badge.grade-B { background: rgba(56, 189, 248, 0.13); }
.best-badge.grade-C { background: rgba(251, 146, 60, 0.13); }
.best-badge.grade-D { background: rgba(248, 113, 113, 0.13); }

.best-pill {
  display: inline-block;
  margin: 4px auto 0;
  padding: 5px 14px; border-radius: 999px;
  background: rgba(255, 215, 0, 0.14);
  border: 1px solid rgba(255, 215, 0, 0.45);
  color: #ffe177; font-weight: 800; font-size: 12.5px; letter-spacing: 0.08em;
}
.res-stats {
  display: flex; justify-content: center; gap: 30px;
  margin: 20px 0 12px;
}
.res-stats label { display: block; color: var(--dim); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; }
.res-stats span { font-size: 23px; font-weight: 800; }
.res-counts { display: flex; justify-content: center; gap: 14px; font-size: 12.5px; font-weight: 600; flex-wrap: wrap; }
.res-counts .perfect { color: #7ff7d4; }
.res-counts .great { color: #7cc7ff; }
.res-counts .good { color: #c9b8ff; }
.res-counts .missc { color: #ff7b8a; }

/* ── settings ───────────────────────────────────────────────────── */
.set-row {
  display: flex; justify-content: space-between; align-items: center;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(130, 150, 220, 0.1);
}
.set-row label { font-size: 14.5px; font-weight: 600; }
.set-row label small { display: block; color: var(--dim); font-weight: 400; font-size: 11.5px; margin-top: 2px; }
.set-row select {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 8px 10px; border-radius: 10px;
  font-family: inherit; font-size: 13px;
}
.slider-wrap { display: flex; align-items: center; gap: 10px; }
.slider-wrap input[type=range] { width: 130px; accent-color: #38bdf8; }
.slider-val { color: var(--dim); font-size: 12.5px; min-width: 48px; text-align: right; font-variant-numeric: tabular-nums; }
.toggle {
  width: 46px; height: 26px; border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.08);
  position: relative; cursor: pointer;
  transition: background 0.18s;
}
.toggle::after {
  content: '';
  position: absolute; top: 2.5px; left: 3px;
  width: 19px; height: 19px; border-radius: 50%;
  background: #fff;
  transition: transform 0.18s;
}
.toggle.on { background: linear-gradient(120deg, #38bdf8, #818cf8); border-color: transparent; }
.toggle.on::after { transform: translateX(19px); }
#settings-body .btn { margin-top: 16px; width: 100%; }
#settings-close, #howto-close { margin-top: 20px; width: 100%; }

.howto-body p { margin-bottom: 13px; font-size: 14.5px; line-height: 1.55; color: #c7cdea; }
.howto-body b { color: var(--ink); }

/* ── toast ──────────────────────────────────────────────────────── */
#toast {
  position: fixed; bottom: 26px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(15, 20, 45, 0.95);
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 12px 22px; border-radius: 14px;
  font-size: 14px; font-weight: 600;
  opacity: 0; pointer-events: none;
  transition: all 0.25s;
  z-index: 100;
  max-width: 90vw;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 640px) {
  .panel { padding: 26px 22px; }
  #combo { font-size: 48px; }
  .res-stats { gap: 18px; }
}