:root{--bg:#070b16;--bg-2:#0f172a;--card:#111827b8;--card-border:#94a3b81f;--accent:#6366f1;--accent-2:#22d3ee;--text:#e5e7eb;--muted:#94a3b8;--success:#34d399;--danger:#f87171;--radius:16px;--shadow:0 20px 60px #00000073}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:radial-gradient(1200px 600px at 10% -10%, #6366f140, transparent 60%), radial-gradient(900px 500px at 100% 0%, #22d3ee2e, transparent 60%), linear-gradient(180deg, var(--bg), var(--bg-2));min-height:100vh;color:var(--text);-webkit-font-smoothing:antialiased;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.app{max-width:980px;margin:0 auto;padding:40px 20px 60px}.hero{text-align:center;margin-bottom:32px}.badge{color:#c7d2fe;letter-spacing:.3px;background:#6366f126;border:1px solid #6366f159;border-radius:999px;margin-bottom:16px;padding:6px 14px;font-size:13px;font-weight:600;display:inline-block}[data-theme=light]{--bg:#f8fafc;--bg-2:#e2e8f0;--card:#ffffffd1;--card-border:#0f172a1a;--accent:#4f46e5;--accent-2:#0891b2;--text:#0f172a;--muted:#475569;--shadow:0 20px 60px #0f172a1f}[data-theme=midnight]{--bg:#020617;--bg-2:#0f172a;--card:#0f172abf;--card-border:#38bdf82e;--accent:#38bdf8;--accent-2:#818cf8;--text:#e0f2fe;--muted:#7dd3fc;--shadow:0 20px 60px #02061799}[data-theme=sunset]{--bg:#1a0b14;--bg-2:#2a1220;--card:#2a1220bf;--card-border:#fb923c33;--accent:#fb923c;--accent-2:#f472b6;--text:#fff1f2;--muted:#fda4af;--shadow:0 20px 60px #1a0b1499}[data-theme=forest]{--bg:#052014;--bg-2:#0a2f1f;--card:#0a2f1fbf;--card-border:#34d39933;--accent:#34d399;--accent-2:#a3e635;--text:#ecfdf5;--muted:#6ee7b7;--shadow:0 20px 60px #05201499}.theme-switcher{z-index:60;background:var(--card);border:1px solid var(--card-border);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);max-width:calc(100vw - 32px);box-shadow:var(--shadow);border-radius:14px;flex-wrap:wrap;align-items:center;gap:8px;padding:8px 12px;display:flex;position:fixed;top:16px;right:16px}.theme-switcher .theme-label{color:var(--muted);margin-right:2px;font-size:12px;font-weight:600}.theme-switcher label{color:var(--text);cursor:pointer;border-radius:6px;align-items:center;gap:5px;padding:2px 4px;font-size:12px;display:inline-flex}.theme-switcher label:hover{background:#94a3b814}.theme-switcher input[type=radio]{accent-color:var(--accent);cursor:pointer}@media (width<=600px){.theme-switcher{gap:6px;padding:6px 8px;top:10px;right:10px}.theme-switcher .theme-label{display:none}.theme-switcher label{font-size:11px}}.hero h1{background:linear-gradient(120deg, var(--text), var(--accent), var(--accent-2));color:#0000;-webkit-background-clip:text;background-clip:text;margin:0 0 12px;font-size:clamp(2rem,5vw,3rem);font-weight:800}.subtitle{color:var(--muted);max-width:640px;margin:0 auto;font-size:1.05rem;line-height:1.6}.card{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);box-shadow:var(--shadow);margin-bottom:20px;padding:24px}.pickers{flex-wrap:wrap;gap:12px;margin-bottom:18px;display:flex}.btn{color:var(--text);cursor:pointer;background:#1e293bcc;border:1px solid #94a3b82e;border-radius:12px;align-items:center;gap:8px;padding:11px 18px;font-size:14px;font-weight:600;transition:transform .15s,background .15s,border-color .15s,box-shadow .15s;display:inline-flex}.btn:hover:not(:disabled){border-color:#6366f180;transform:translateY(-1px);box-shadow:0 8px 24px #6366f133}.btn:active:not(:disabled){transform:translateY(0)}.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-icon{font-size:16px}.btn-primary{background:linear-gradient(135deg, var(--accent), #4f46e5);color:#fff;border-color:#0000}.btn-primary:hover:not(:disabled){box-shadow:0 10px 28px #6366f173}.btn-secondary{background:#1e293bcc}.btn-ghost{background:0 0;border-color:#94a3b840}.btn-ghost:hover:not(:disabled){background:#94a3b814}.dropzone{text-align:center;color:var(--muted);cursor:pointer;border:2px dashed #94a3b840;border-radius:14px;margin-bottom:18px;padding:36px 20px;transition:border-color .2s,background .2s,transform .2s}.dropzone:hover{border-color:#6366f180}.dropzone.dragover{border-color:var(--accent);background:#6366f114;transform:scale(1.01)}.drop-icon{margin-bottom:8px;font-size:34px}.drop-title{color:var(--text);margin:0 0 4px;font-weight:600}.drop-hint{color:var(--muted);margin:0;font-size:13px}.options{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:18px;display:flex}.quality-label{color:var(--muted);align-items:center;gap:8px;font-size:14px;display:flex}input[type=number]{width:80px;color:var(--text);background:#0f172acc;border:1px solid #94a3b833;border-radius:10px;padding:8px 10px;font-size:14px}input[type=number]:focus{border-color:var(--accent);outline:none}.progress-wrap{align-items:center;gap:12px;margin-bottom:18px;display:flex}progress{appearance:none;border-radius:999px;flex:1;height:10px;overflow:hidden}progress::-webkit-progress-bar{background:#94a3b826;border-radius:999px}progress::-webkit-progress-value{background:linear-gradient(90deg, var(--accent), var(--accent-2));border-radius:999px}progress::-moz-progress-bar{background:linear-gradient(90deg, var(--accent), var(--accent-2));border-radius:999px}#progressText{color:var(--muted);text-align:right;min-width:60px;font-size:13px}.file-list-wrap h2,.converter h2{color:var(--text);margin:16px 0 8px;font-size:1rem}.file-list{max-height:160px;color:var(--muted);background:#0f172a99;border:1px solid #94a3b81f;border-radius:10px;padding:10px 12px;font-size:13px;line-height:1.7;overflow:auto}.file-list .file-item{justify-content:space-between;gap:8px;display:flex}.file-list .file-item span{color:var(--text)}.download-link{color:var(--accent-2);font-size:12px;font-weight:600;text-decoration:none}.download-link:hover{text-decoration:underline}textarea{width:100%;color:var(--text);resize:vertical;background:#0f172a99;border:1px solid #94a3b81f;border-radius:10px;padding:12px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px;line-height:1.6}.features h2{margin-top:0}.feature-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-top:14px;display:grid}.feature{background:#0f172a80;border:1px solid #94a3b81a;border-radius:12px;padding:16px;transition:transform .2s,border-color .2s}.feature:hover{border-color:#6366f159;transform:translateY(-2px)}.feature span{font-size:24px}.feature h3{margin:8px 0 4px;font-size:15px}.feature p{color:var(--muted);margin:0;font-size:13px;line-height:1.5}.privacy p{color:var(--muted);line-height:1.7}.privacy strong{color:var(--text)}footer{color:var(--muted);text-align:center;margin-top:24px;font-size:13px}@media (width<=600px){.app{padding:24px 14px 40px}.options{flex-direction:column;align-items:stretch}.btn{justify-content:center}.quality-label{justify-content:space-between}}