:root{--bg:#0b0d1a;--card:rgba(255,255,255,.055);--line:rgba(255,255,255,.1);--fg:#f1f3ff;--mut:#9ba1c7;--a:#7c5cff;--b:#22d3ee;--in:#11142a}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-height:100vh;color:var(--fg);font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.5;
 background:radial-gradient(900px 500px at 10% -10%,rgba(124,92,255,.28),transparent 60%),radial-gradient(800px 500px at 100% 0,rgba(34,211,238,.18),transparent 55%),var(--bg);background-attachment:fixed}
main{max-width:760px;margin:auto;padding:0 18px 60px}
.nav{position:sticky;top:0;z-index:5;display:flex;gap:6px;justify-content:center;padding:12px 0;margin:0 -18px 18px;background:rgba(11,13,26,.72);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav a{color:var(--mut);text-decoration:none;font-weight:600;font-size:14px;padding:8px 16px;border-radius:999px;transition:.2s}
.nav a:hover{color:var(--fg);background:var(--card)}
.nav a.on{color:#fff;background:linear-gradient(135deg,var(--a),var(--b));box-shadow:0 6px 20px rgba(124,92,255,.35)}
h1{margin:8px 0 4px;font-size:clamp(28px,6vw,40px);letter-spacing:-.02em;background:linear-gradient(135deg,#fff,#b9a8ff 55%,var(--b));-webkit-background-clip:text;background-clip:text;color:transparent}
h2{font-size:17px;margin:0 0 12px}
.sub,.hint{color:var(--mut);font-size:14px;margin:4px 0 0}
.hint{margin:10px 0}
section{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:20px;margin:18px 0;backdrop-filter:blur(8px);box-shadow:0 10px 40px rgba(0,0,0,.25);animation:up .5s ease both}
@keyframes up{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
video{width:100%;margin:14px 0;border-radius:14px;background:#000;max-height:60vh;border:1px solid var(--line)}
label{display:block;margin:14px 0 0;font-size:13px;font-weight:600;color:var(--mut)}
select,input[type=number],input[type=text]{display:block;width:100%;margin-top:6px;background:var(--in);color:var(--fg);border:1px solid var(--line);border-radius:12px;padding:11px 12px;font-size:15px;outline:none;transition:.2s}
select:focus,input:focus{border-color:var(--a);box-shadow:0 0 0 3px rgba(124,92,255,.25)}
input[type=file]{display:block;width:100%;margin-top:6px;color:var(--mut);font-size:14px;background:var(--in);border:1.5px dashed var(--line);border-radius:14px;padding:14px}
input[type=file]::file-selector-button{background:linear-gradient(135deg,var(--a),var(--b));color:#fff;border:0;border-radius:10px;padding:8px 14px;margin-right:12px;font-weight:600;cursor:pointer}
input[type=checkbox]{accent-color:var(--a);width:17px;height:17px;vertical-align:middle}
button,#dl{display:inline-block;margin-top:16px;background:linear-gradient(135deg,var(--a),var(--b));color:#fff;border:0;padding:12px 22px;border-radius:12px;font-size:15px;font-weight:700;cursor:pointer;text-decoration:none;box-shadow:0 8px 24px rgba(124,92,255,.35);transition:.2s}
button:hover:not(:disabled),#dl:hover{transform:translateY(-2px);filter:brightness(1.1)}
button:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}
.ghost{background:transparent;border:1px solid var(--a);box-shadow:none;color:var(--fg)}
#dl{background:linear-gradient(135deg,#10b981,#22d3ee);box-shadow:0 8px 24px rgba(16,185,129,.35)}
.row{display:flex;gap:8px;align-items:center;background:var(--in);border:1px solid var(--line);padding:12px;border-radius:14px;margin:10px 0;flex-wrap:wrap}
.row .t{flex:1 1 100%;font-size:14px}
.row input[type=number]{width:90px;margin:0;padding:8px}
.status{margin-top:12px;font-size:14px;color:var(--b);min-height:1em}
a{color:var(--b)}
@media(max-width:480px){section{padding:16px;border-radius:16px}button,#dl{width:100%;text-align:center}.nav a{padding:8px 12px}}