:root{--bg:#fff;--fg:#1b1f24;--mut:#5b6672;--line:#e3e7ec;--acc:#2563eb;--accfg:#fff;--card:#f6f8fa}
@media(prefers-color-scheme:dark){:root{--bg:#0f1318;--fg:#e8ecf0;--mut:#9aa6b2;--line:#27303a;--acc:#5b8def;--accfg:#0b1020;--card:#171d24}}
*{box-sizing:border-box}body{margin:0;font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--fg)}
header,main,footer{max-width:760px;margin:0 auto;padding:0 16px}
header{display:flex;justify-content:space-between;align-items:center;padding-top:16px;padding-bottom:8px}
header a.logo{font-weight:700;color:var(--fg);text-decoration:none}
nav a{color:var(--mut);margin-left:14px;text-decoration:none;font-size:14px}
h1{font-size:30px;line-height:1.2;margin:24px 0 8px}h2{font-size:20px;margin:32px 0 8px}
p.lead{color:var(--mut);margin-top:0}
.drop{border:2px dashed var(--line);border-radius:14px;background:var(--card);padding:36px 16px;text-align:center;margin:20px 0}
.drop.over{border-color:var(--acc)}
button,.btn{background:var(--acc);color:var(--accfg);border:0;border-radius:10px;padding:10px 18px;font:inherit;font-weight:600;cursor:pointer;text-decoration:none;display:inline-block}
button.sec{background:transparent;color:var(--acc);border:1px solid var(--acc)}
.opts{display:flex;gap:16px;flex-wrap:wrap;justify-content:center;margin:14px 0 0;font-size:14px;color:var(--mut)}
select,input[type=range]{font:inherit}
ul.files{list-style:none;padding:0;margin:0}
ul.files li{display:flex;gap:10px;align-items:center;justify-content:space-between;border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin:8px 0;font-size:14px;word-break:break-all}
.err{color:#d03b3b}.ok{color:#1c8a4a}
details{border-bottom:1px solid var(--line);padding:10px 0}summary{cursor:pointer;font-weight:600}
footer{padding:32px 16px 48px;color:var(--mut);font-size:14px;border-top:1px solid var(--line);margin-top:48px}
footer a{color:var(--mut);margin-right:14px}
.ad{min-height:0}