/* =========================================================
   AudioSwap — design tokens
   Change the palette here and the whole app follows.
   ========================================================= */
:root{
  --bg:#0B0D10;
  --bg-2:#0F1318;
  --surface:#141920;
  --surface-2:#1A212A;
  --line:#252D38;
  --line-soft:#1D242D;
  --text:#EEF2F7;
  --text-2:#A7B2C0;
  --text-3:#6F7C8C;
  --accent:#6C5CE7;
  --accent-2:#00D4B8;
  --accent-soft:rgba(108,92,231,.14);
  --danger:#FF6B6B;
  --grad:linear-gradient(120deg,var(--accent),var(--accent-2));
  --r-sm:8px; --r:14px; --r-lg:20px; --r-xl:28px;
  --shadow:0 18px 50px -20px rgba(0,0,0,.75);
  --ring:0 0 0 3px rgba(108,92,231,.45);
  --wrap:1180px;
  --font:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--text);font-family:var(--font);
  font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(900px 420px at 12% -8%,rgba(108,92,231,.16),transparent 60%),
    radial-gradient(760px 380px at 92% 4%,rgba(0,212,184,.10),transparent 60%);
  background-attachment:fixed;
}
h1,h2,h3,h4{margin:0;line-height:1.18;letter-spacing:-.02em;font-weight:700}
p{margin:0}
button,input,select{font:inherit;color:inherit}
.wrap{width:min(100% - 40px,var(--wrap));margin-inline:auto}
.muted{color:var(--text-3)}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
[hidden]{display:none !important}

.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:#fff;padding:10px 16px;border-radius:0 0 var(--r-sm) 0;z-index:99}
.skip:focus{left:0}
:focus-visible{outline:none;box-shadow:var(--ring);border-radius:var(--r-sm)}

/* ---------------- top bar ---------------- */
.topbar{position:sticky;top:0;z-index:40;background:rgba(11,13,16,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--line-soft)}
.topbar__in{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text)}
.brand__mark{display:grid;place-items:center}
.brand__text{font-weight:500;font-size:18px;letter-spacing:-.02em}
.brand__text b{font-weight:700}
.topbar__right{display:flex;align-items:center;gap:12px}
.pill{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:500;color:var(--accent-2);
  background:rgba(0,212,184,.09);border:1px solid rgba(0,212,184,.22);padding:6px 12px;border-radius:999px}

/* ---------------- buttons ---------------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;
  border:1px solid transparent;border-radius:var(--r);padding:12px 22px;font-weight:600;font-size:14px;
  text-decoration:none;transition:transform .15s,filter .15s,background .2s,border-color .2s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--grad);color:#08090B;box-shadow:0 10px 30px -12px rgba(108,92,231,.9)}
.btn--primary:hover{filter:brightness(1.08)}
.btn--ghost{background:var(--surface);border-color:var(--line);color:var(--text-2)}
.btn--ghost:hover{border-color:var(--accent);color:var(--text)}
.btn--lg{padding:15px 30px;font-size:15px;border-radius:var(--r-lg)}
.btn--sm{padding:9px 16px;font-size:13px;border-radius:10px}
.btn--block{width:100%}
.btn:disabled{opacity:.42;cursor:not-allowed;filter:grayscale(.6)}
.linkbtn{background:none;border:0;padding:0;color:var(--accent-2);font-size:12.5px;font-weight:600;cursor:pointer;text-decoration:underline;text-underline-offset:3px}
.iconbtn{display:grid;place-items:center;width:38px;height:38px;border-radius:50%;border:1px solid var(--line);
  background:var(--surface-2);color:var(--text);cursor:pointer;flex:none}
.iconbtn:hover{border-color:var(--accent)}

/* ---------------- stage / hero ---------------- */
.stage{padding:44px 0 72px}
.hero{max-width:720px;margin-bottom:38px}
.eyebrow{font-size:12px;font-weight:700;letter-spacing:.13em;text-transform:uppercase;color:var(--accent-2);margin-bottom:14px}
h1{font-size:clamp(30px,5.2vw,50px);margin-bottom:16px}
h2{font-size:clamp(22px,3vw,30px)}
.lead{color:var(--text-2);font-size:clamp(15px,1.6vw,17px);max-width:62ch}

/* ---------------- dropzones ---------------- */
.dropgrid{display:grid;grid-template-columns:1fr auto 1fr;gap:18px;align-items:stretch}
.swapicon{align-self:center;display:grid;place-items:center;width:44px;height:44px;border-radius:50%;
  background:var(--surface);border:1px solid var(--line);color:var(--accent)}
.drop{position:relative;background:var(--surface);border:1.5px dashed var(--line);border-radius:var(--r-xl);
  padding:34px 28px;text-align:center;cursor:pointer;transition:border-color .2s,background .2s,transform .2s}
.drop:hover,.drop:focus-visible{border-color:var(--accent);background:var(--surface-2)}
.drop.is-over{border-color:var(--accent-2);background:rgba(0,212,184,.06);transform:scale(1.01)}
.drop.is-set{border-style:solid;border-color:rgba(0,212,184,.4);background:linear-gradient(180deg,rgba(0,212,184,.06),transparent)}
.drop.is-set .drop__cta,.drop.is-set p{display:none}
.drop__icon{width:58px;height:58px;margin:0 auto 16px;display:grid;place-items:center;border-radius:18px;
  background:var(--accent-soft);color:var(--accent)}
.drop--music .drop__icon{background:rgba(0,212,184,.12);color:var(--accent-2)}
.drop h3{font-size:18px;margin-bottom:8px}
.drop p{color:var(--text-3);font-size:13.5px;max-width:34ch;margin:0 auto}
.drop__cta{display:inline-block;margin-top:18px;padding:10px 20px;border-radius:12px;background:var(--surface-2);
  border:1px solid var(--line);font-size:13.5px;font-weight:600;color:var(--text-2)}
.drop__done{margin-top:14px;display:grid;gap:5px;justify-items:center}
.drop__name{font-size:14px;word-break:break-all;max-width:90%}
.drop__meta{font-size:12.5px;color:var(--text-3)}

.startrow{margin-top:30px;display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center}
.hint{color:var(--text-3);font-size:13px;max-width:58ch}
.hint--sm{font-size:12px;text-align:center;margin-top:4px}

.trust{list-style:none;margin:52px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.trust li{background:var(--surface);border:1px solid var(--line-soft);border-radius:var(--r);padding:18px 20px;
  color:var(--text-3);font-size:13.5px}
.trust b{color:var(--text);font-weight:600;display:block;margin-bottom:3px}

/* ---------------- editor layout ---------------- */
.edithead{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:26px}
.editor{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(300px,1fr);gap:20px;align-items:start}
.panel{background:var(--surface);border:1px solid var(--line-soft);border-radius:var(--r-xl);padding:20px}
.panel--side{position:sticky;top:84px;display:grid;gap:22px}

.player{background:#000;border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line)}
.player video,.player img{display:block;width:100%;max-height:46vh;background:#000;object-fit:contain}
.or{color:var(--accent-2);font-weight:500}
.lenreadout{font-size:12.5px;color:var(--text-3);padding:9px 12px;border-radius:10px;
  background:rgba(0,212,184,.07);border:1px solid rgba(0,212,184,.2)}
.lenreadout b{color:var(--accent-2);font-weight:700;font-variant-numeric:tabular-nums}
.player__bar{display:flex;align-items:center;gap:14px;padding:10px 12px;background:var(--surface-2);border-top:1px solid var(--line)}
.tc{font-size:13px;color:var(--text-3);font-variant-numeric:tabular-nums}
.tc b{color:var(--text);font-weight:600}
.mutebox{margin-left:auto;display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--text-3);cursor:pointer}

/* ---------------- timelines ---------------- */
.track{margin-top:24px}
.track__head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:10px;flex-wrap:wrap}
.track__head h4{font-size:14px;font-weight:600}
.track__val{font-size:12.5px;color:var(--text-3);font-variant-numeric:tabular-nums}
.track__val b{color:var(--accent-2);font-weight:600}
.track__foot{display:flex;justify-content:space-between;gap:10px;margin-top:8px;font-size:11.5px;color:var(--text-3);font-variant-numeric:tabular-nums}

.timeline{position:relative;height:74px;border-radius:12px;background:var(--surface-2);border:1px solid var(--line);
  overflow:hidden;touch-action:none;user-select:none;cursor:pointer}
.film{position:absolute;inset:0;display:flex}
.film canvas,.film img{flex:1 1 0;min-width:0;height:100%;object-fit:cover;opacity:.85}
.film.is-empty{background:repeating-linear-gradient(90deg,#1A212A 0 26px,#1E2630 26px 52px)}
.dim{position:absolute;top:0;bottom:0;background:rgba(8,10,13,.72);backdrop-filter:saturate(.4) blur(1px)}
.dim--l{left:0}.dim--r{right:0}
.sel{position:absolute;top:0;bottom:0;border-top:2px solid var(--accent);border-bottom:2px solid var(--accent);pointer-events:none}
.playhead{position:absolute;top:0;bottom:0;width:2px;background:#fff;box-shadow:0 0 8px rgba(255,255,255,.8);pointer-events:none;transform:translateX(-1px)}
.handle{position:absolute;top:0;bottom:0;width:16px;border:0;padding:0;background:var(--accent);cursor:ew-resize;
  display:grid;place-items:center;z-index:3;transition:background .15s}
.handle:hover{background:#8574f0}
.handle i{display:block;width:2px;height:20px;border-radius:2px;background:rgba(11,13,16,.65);
  box-shadow:4px 0 0 rgba(11,13,16,.65),-4px 0 0 rgba(11,13,16,.65)}
.handle--l{border-radius:12px 0 0 12px}
.handle--r{border-radius:0 12px 12px 0}
.handle--m{background:var(--accent-2);border-radius:4px;width:14px}
.handle--m:hover{background:#2ee9d0}

.timeline--wave{height:74px;cursor:pointer}
.timeline--wave canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.mzone{position:absolute;top:0;bottom:0;background:rgba(0,212,184,.16);border-left:2px solid var(--accent-2);
  border-right:2px solid var(--accent-2);pointer-events:none}

/* ---------------- controls ---------------- */
.group{display:grid;gap:16px}
.group h4{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--text-3);font-weight:700}
.group--go{gap:10px;padding-top:18px;border-top:1px solid var(--line-soft)}
.ctl{display:grid;gap:8px}
.ctl label{display:flex;justify-content:space-between;align-items:baseline;gap:10px;font-size:13.5px;font-weight:500;color:var(--text-2)}
.ctl output{color:var(--accent-2);font-weight:600;font-size:13px;font-variant-numeric:tabular-nums}
.ctl__hint{font-size:12px;color:var(--text-3);line-height:1.5}
.ctl--split{grid-template-columns:1fr 1fr;gap:16px}
.ctl--split>div{display:grid;gap:8px}

input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:5px;border-radius:99px;
  background:var(--line);outline:none;cursor:pointer}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:17px;height:17px;border-radius:50%;
  background:var(--accent-2);border:3px solid var(--bg);box-shadow:0 0 0 1px var(--accent-2);cursor:grab}
input[type=range]::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:var(--accent-2);
  border:3px solid var(--bg);box-shadow:0 0 0 1px var(--accent-2);cursor:grab}

select{width:100%;background:var(--surface-2);border:1px solid var(--line);border-radius:10px;padding:11px 12px;
  font-size:13.5px;color:var(--text);cursor:pointer;appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236F7C8C' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 10px center;background-size:16px;padding-right:34px}
select:hover{border-color:var(--accent)}
.check{display:flex;align-items:flex-start;gap:9px;font-size:13px;color:var(--text-2);cursor:pointer}
input[type=checkbox]{accent-color:var(--accent-2);width:15px;height:15px;cursor:pointer;flex:none;margin-top:1px}

/* ---------------- result ---------------- */
.result{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(280px,1fr);gap:20px;align-items:start}
.result__player{background:#000;border-radius:var(--r-xl);overflow:hidden;border:1px solid var(--line)}
.result__player video{display:block;width:100%;max-height:58vh}
.result__player audio{display:block;width:100%;padding:18px;background:var(--surface)}
.result__side{background:var(--surface);border:1px solid var(--line-soft);border-radius:var(--r-xl);padding:22px;display:grid;gap:12px}
.facts{margin:0 0 6px;display:grid;gap:10px}
.facts>div{display:flex;justify-content:space-between;gap:12px;padding-bottom:10px;border-bottom:1px solid var(--line-soft)}
.facts dt{color:var(--text-3);font-size:13px}
.facts dd{margin:0;font-size:13px;font-weight:600;text-align:right;word-break:break-all}

/* ---------------- overlay ---------------- */
.overlay{position:fixed;inset:0;z-index:80;display:grid;place-items:center;padding:24px;
  background:rgba(6,8,10,.82);backdrop-filter:blur(8px)}
.ovcard{width:min(100%,420px);background:var(--surface);border:1px solid var(--line);border-radius:var(--r-xl);
  padding:32px 28px;text-align:center;box-shadow:var(--shadow);display:grid;gap:12px;justify-items:center}
.ring{--p:0;width:104px;height:104px;border-radius:50%;display:grid;place-items:center;
  background:conic-gradient(var(--accent-2) calc(var(--p)*1%),var(--line) 0);position:relative}
.ring::after{content:"";position:absolute;inset:9px;border-radius:50%;background:var(--surface)}
.ring span{position:relative;z-index:1;font-size:20px;font-weight:700;font-variant-numeric:tabular-nums}
.ovcard h3{font-size:19px}
.ovcard p{color:var(--text-2);font-size:13.5px;min-height:2.6em}
.loglet{width:100%;text-align:left}
.loglet summary{font-size:12px;color:var(--text-3);cursor:pointer}
.loglet pre{max-height:150px;overflow:auto;background:var(--bg-2);border:1px solid var(--line-soft);border-radius:10px;
  padding:10px;font-size:11px;color:var(--text-3);white-space:pre-wrap;word-break:break-all;margin:8px 0 0}

.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%);z-index:90;max-width:min(92vw,520px);
  background:var(--surface-2);border:1px solid var(--danger);color:var(--text);padding:13px 20px;border-radius:14px;
  font-size:13.5px;box-shadow:var(--shadow)}

/* ---------------- footer ---------------- */
.foot{border-top:1px solid var(--line-soft);padding:30px 0 44px;margin-top:20px}
.foot__in{display:grid;gap:8px;max-width:78ch}
.foot p{font-size:12.5px;color:var(--text-3)}

/* ---------------- responsive ---------------- */
@media (max-width:1000px){
  .editor,.result{grid-template-columns:1fr}
  .panel--side{position:static}
}
@media (max-width:760px){
  .dropgrid{grid-template-columns:1fr}
  .swapicon{transform:rotate(90deg);justify-self:center}
  .trust{grid-template-columns:1fr}
  .pill{display:none}
  .stage{padding:30px 0 56px}
  .player video{max-height:38vh}
  .track__foot .muted{display:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}