:root{
  --bg:#08080a;
  --bg2:#0d0d12;
  --panel:#121216;
  --panel2:#17171d;
  --line:#26262e;
  --fg:#f3f3f5;
  --mut:#9a9aa6;
  --mut2:#6c6c78;
  --red:#c4122f;
  --red2:#e11d3a;
  --gold:#d8b15a;
  --ok:#36c46b;
  --rad:16px;
  --shadow:0 18px 50px -18px rgba(0,0,0,.8);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:
    radial-gradient(1100px 600px at 50% -8%, #1a1218 0%, transparent 60%),
    radial-gradient(800px 500px at 92% 0%, #141019 0%, transparent 55%),
    var(--bg);
  color:var(--fg);
  font:16px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
  padding:max(16px,env(safe-area-inset-top)) 16px max(28px,env(safe-area-inset-bottom));
}
.wrap{max-width:760px;margin:0 auto}

/* header */
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:6px 2px 0}
.brand{display:flex;align-items:center;gap:11px}
.logo{width:30px;height:30px;border-radius:9px;flex:none;
  background:
    radial-gradient(circle at 50% 50%, #fff 0 5px, transparent 6px),
    radial-gradient(circle at 50% 50%, var(--red) 0 13px, transparent 14px),
    #0a0a0c;
  box-shadow:inset 0 0 0 1px #2a2a32;}
.brandname{font-weight:800;letter-spacing:.16em;font-size:15px}
.privacy{display:flex;align-items:center;gap:7px;font-size:12.5px;color:var(--mut);
  background:var(--panel);border:1px solid var(--line);padding:7px 11px;border-radius:999px}
.privacy .dot{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 10px var(--ok)}

/* hero */
.hero{padding:34px 4px 22px}
.hero h1{font-size:clamp(28px,7vw,46px);line-height:1.04;margin:0 0 14px;font-weight:850;letter-spacing:-.02em}
.hero h1 em{font-style:normal;color:var(--red2);
  background:linear-gradient(180deg,#ff3656,#c4122f);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero .sub{color:var(--mut);font-size:16px;max-width:62ch;margin:0}
.hero .sub strong{color:#e7e7ea}

/* dropzone */
.dropzone{margin-top:6px;border:1.5px dashed #34343e;border-radius:var(--rad);
  background:linear-gradient(180deg,var(--panel),#0e0e12);
  padding:40px 20px;text-align:center;cursor:pointer;transition:.18s;outline:none}
.dropzone:hover,.dropzone:focus-visible{border-color:var(--red);background:linear-gradient(180deg,#16121a,#0e0e12)}
.dropzone.drag{border-color:var(--red2);background:#1b1320;transform:scale(1.005)}
.drop-icon{font-size:34px;color:var(--red2);line-height:1}
.drop-title{font-size:19px;font-weight:750;margin-top:10px}
.drop-hint{color:var(--mut);margin-top:6px;font-size:14.5px}
.drop-hint .link{color:var(--red2);text-decoration:underline;text-underline-offset:3px}
.drop-note{color:var(--mut2);margin-top:12px;font-size:12.5px}

/* status */
.status{margin-top:16px;padding:13px 16px;border-radius:12px;font-size:14px;
  border:1px solid var(--line);background:var(--panel)}
.status.err{border-color:#5a1a22;background:#1d1013;color:#ffb9c2}
.status.work{border-color:#2c2c36}
.status .spin{display:inline-block;width:13px;height:13px;border:2px solid #3a3a44;border-top-color:var(--red2);
  border-radius:50%;animation:sp .7s linear infinite;vertical-align:-2px;margin-right:9px}
@keyframes sp{to{transform:rotate(360deg)}}

/* studio */
.studio{margin-top:18px}
.track{display:flex;align-items:center;justify-content:space-between;gap:12px;
  background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:13px 15px}
.track-name{font-weight:700;font-size:15px;word-break:break-word}
.track-info{color:var(--mut);font-size:12.5px;margin-top:2px}

.presets{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.preset{appearance:none;border:1px solid var(--line);background:var(--panel);color:var(--mut);
  padding:9px 14px;border-radius:999px;font-size:13.5px;font-weight:600;cursor:pointer;transition:.15s}
.preset:hover{color:var(--fg);border-color:#3a3a46}
.preset.on{background:linear-gradient(180deg,#e11d3a,#a50f27);color:#fff;border-color:transparent;box-shadow:0 6px 18px -8px var(--red)}

.controls{margin-top:18px;display:grid;grid-template-columns:1fr 1fr;gap:16px 22px;
  background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px}
@media(max-width:560px){.controls{grid-template-columns:1fr;gap:15px}}
.ctrl label{display:flex;align-items:baseline;justify-content:space-between;gap:10px;font-size:13.5px;font-weight:650;margin-bottom:9px}
.ctrl label .hint{color:var(--mut2);font-weight:500;font-size:11.5px;text-align:right}
.space-ctrl{grid-column:1/-1}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.seg button{appearance:none;background:transparent;color:var(--mut);border:none;padding:9px 18px;font-size:13.5px;font-weight:600;cursor:pointer}
.seg button.on{background:var(--red);color:#fff}

input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:6px;border-radius:6px;
  background:linear-gradient(90deg,var(--red) 0%,var(--red) 50%,#2a2a32 50%);outline:none;cursor:pointer}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;border-radius:50%;
  background:#fff;border:3px solid var(--red2);box-shadow:0 2px 8px rgba(0,0,0,.5);cursor:pointer}
input[type=range]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:#fff;border:3px solid var(--red2);cursor:pointer}

.render-row{display:flex;align-items:center;gap:14px;margin-top:18px;flex-wrap:wrap}
.render-state{color:var(--mut);font-size:13px}
.render-state.warn{color:var(--gold)}

/* buttons */
.primary{appearance:none;border:none;cursor:pointer;border-radius:12px;font-weight:750;font-size:15px;
  padding:14px 22px;color:#fff;background:linear-gradient(180deg,#e11d3a,#a50f27);
  box-shadow:0 10px 26px -10px var(--red);transition:.15s}
.primary:hover{filter:brightness(1.06)}
.primary:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;filter:none}
.ghost{appearance:none;border:1px solid var(--line);background:var(--panel2);color:var(--fg);
  cursor:pointer;border-radius:12px;font-weight:650;font-size:14.5px;padding:13px 20px;transition:.15s}
.ghost:hover{border-color:#3a3a46}
.ghost.small{padding:8px 13px;font-size:12.5px;border-radius:9px;flex:none}
.tag{display:block;font-weight:500;font-size:11px;opacity:.85;margin-top:2px}

/* player */
.player{margin-top:20px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px}
.spectrum{width:100%;height:64px;display:block;border-radius:9px;background:#0c0c10;margin-bottom:14px}
.ab{display:flex;gap:8px;margin-bottom:14px}
.ab-btn{flex:1;appearance:none;border:1px solid var(--line);background:var(--panel2);color:var(--mut);
  padding:10px;border-radius:10px;font-weight:650;font-size:13.5px;cursor:pointer;transition:.12s}
.ab-btn.on{background:#fff;color:#0a0a0c;border-color:#fff}
.ab-btn#abB.on{background:linear-gradient(180deg,#e11d3a,#a50f27);color:#fff}
.transport{display:flex;align-items:center;gap:12px}
.play{flex:none;width:46px;height:46px;border-radius:50%;border:none;cursor:pointer;color:#fff;font-size:16px;
  background:linear-gradient(180deg,#2a2a32,#1a1a20);box-shadow:inset 0 0 0 1px #3a3a44}
.play.playing{background:linear-gradient(180deg,#e11d3a,#a50f27)}
.transport .time{flex:none;color:var(--mut);font-size:12.5px;font-variant-numeric:tabular-nums;min-width:84px;text-align:right}
.compare-note{color:var(--mut2);font-size:12px;margin-top:12px;text-align:center}

/* export */
.export{margin-top:18px;background:linear-gradient(180deg,#15101a,#0e0e12);border:1px solid #2e2230;border-radius:14px;padding:18px}
.export-title{font-weight:750;font-size:15px;margin-bottom:13px}
.export-btns{display:flex;gap:10px;flex-wrap:wrap}
.export-btns .primary,.export-btns .ghost{flex:1;min-width:150px}
.export-state{color:var(--mut);font-size:13px;margin-top:12px;min-height:18px}
.export-state.ok{color:var(--ok)}
.car-tip{color:var(--mut);font-size:12.5px;margin-top:14px;line-height:1.55;border-top:1px solid var(--line);padding-top:13px}
.car-tip strong{color:#e7e7ea}

/* how / footer */
.how{margin-top:26px;border:1px solid var(--line);border-radius:12px;background:var(--panel);overflow:hidden}
.how summary{cursor:pointer;padding:15px 17px;font-weight:650;font-size:14px;list-style:none}
.how summary::-webkit-details-marker{display:none}
.how summary::before{content:"›";display:inline-block;margin-right:10px;color:var(--red2);transition:.2s;font-weight:800}
.how[open] summary::before{transform:rotate(90deg)}
.how-body{padding:0 17px 17px;color:var(--mut);font-size:13.5px;line-height:1.65}
.how-body p{margin:0 0 12px}
.how-body strong{color:#e7e7ea}
.how-body em{color:var(--fg);font-style:normal;font-weight:600}

.foot{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;
  color:var(--mut2);font-size:12px;margin-top:30px;text-align:center}
.foot .sep{opacity:.5}