:root{
  --bg:#0D0B1E;
  --ink:#F3F0FF;
  --muted:#9A94C2;
  --gold:#FFD166;
  --paper:#FFFFFF;
  --paper-ink:#1B1736;
  --paper-muted:#625C88;
  --font:"Rubik", "Segoe UI", system-ui, sans-serif;
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{background:var(--bg)}
body{margin:0;color:var(--ink);font:16px/1.35 var(--font);padding-inline:8px;padding-block:6px 8px;-webkit-tap-highlight-color:transparent;overscroll-behavior:none;
  background:radial-gradient(110% 70% at 50% 20%,#241D52 0%,#07060F 80%) fixed,var(--bg)}
.app{max-width:760px;margin-inline:auto;width:100%;height:calc(100vh - 14px);height:calc(100dvh - 14px);min-height:420px;display:grid;grid-template-rows:auto 1fr;grid-template-columns:minmax(0,1fr);gap:6px}
.bar{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:44px}
.back{color:var(--muted);text-decoration:none;font-weight:600;font-size:15px;white-space:nowrap}
.back:hover{color:var(--ink)}
.title{margin:0;font-weight:800;font-size:clamp(1.25rem,4vw,1.9rem);white-space:nowrap}
.title span{color:#FF4D6D}
.icon-btn{width:42px;height:42px;border-radius:12px;border:0;background:rgba(255,255,255,.1);color:var(--ink);display:grid;place-items:center;cursor:pointer;padding:0;font-size:20px}
button{font:inherit;cursor:pointer}
.btn{border:0;border-radius:12px;background:#ECE9F8;color:var(--paper-ink);font-weight:700;padding:10px 18px;box-shadow:0 4px 0 rgba(0,0,0,.2)}
.btn:active{translate:0 3px;box-shadow:0 1px 0 rgba(0,0,0,.2)}
.btn.primary{background:var(--gold);color:#3D2B00;box-shadow:0 4px 0 #B8902A}
.btn.big{font-size:1.15rem;padding:12px 26px;width:100%}
:focus-visible{outline:3px solid var(--gold);outline-offset:3px}

.stage{position:relative;min-height:0;touch-action:none;user-select:none;-webkit-user-select:none}
canvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none}

.overlay{position:fixed;inset:0;z-index:20;display:grid;place-items:center;padding:16px;background:rgba(5,4,12,.82);overflow-y:auto}
.overlay[hidden]{display:none}
.sheet{width:100%;max-width:480px;background:var(--paper);color:var(--paper-ink);border-radius:22px;padding:20px 22px;display:grid;gap:12px;box-shadow:0 20px 50px rgba(0,0,0,.5)}
.sheet.center{text-align:center;justify-items:center}
.sheet h2{margin:0;font-size:1.6rem}
.help{margin:0;font-size:13.5px;color:var(--paper-muted);line-height:1.6}
.help b{color:var(--paper-ink)}
kbd{display:inline-block;min-width:22px;text-align:center;font:800 12px var(--font);background:#1B1736;color:#fff;border-radius:6px;padding:2px 5px}
.seg{display:flex;gap:6px}
.seg button{flex:1;border:2px solid #E4E1F2;border-radius:12px;background:#fff;color:var(--paper-ink);font-weight:800;padding:8px 4px}
.seg button[aria-checked="true"]{border-color:#7B5CFF;background:#F1EDFF}
.songs{display:grid;gap:8px}
.song{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:10px;border:2px solid #E4E1F2;border-radius:14px;background:#fff;color:var(--paper-ink);padding:10px 12px;text-align:left}
.song:hover{border-color:#7B5CFF}
.song .ic{font-size:26px}
.song b{display:block;font-size:1.02rem}
.song small{color:var(--paper-muted);font-size:12.5px}
.song .best{font-weight:800;font-size:1.2rem;color:#7B5CFF;min-width:2ch;text-align:center}
.grade{font-size:72px;font-weight:800;line-height:1;color:#7B5CFF}
.end-title{margin:0;font-weight:800;font-size:1.4rem}
.lead{margin:0;color:var(--paper-muted);font-weight:700}
.lead:empty{display:none}
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;width:100%}
.stats div{background:#F3F1FB;border-radius:12px;padding:8px 4px;display:grid;gap:2px}
.stats small{font-size:11px;color:var(--paper-muted);text-transform:uppercase;letter-spacing:.05em}
.stats b{font-size:1.15rem;font-variant-numeric:tabular-nums}

@media (max-width:640px){
  .back-tx{display:none}
  .back{font-size:20px}
  .stats{grid-template-columns:repeat(2,minmax(0,1fr))}
}