:root{color-scheme:dark;--bg: #0f1115;--card: #171a21;--text: #e8eaed;--muted: #9aa0a6;--accent: #4c8bf5;--border: #2a2f3a;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}.app{max-width:1100px;margin:0 auto;padding:1.5rem}header h1{margin:0 0 .25rem;font-size:1.6rem}.subtitle{margin:0 0 1rem;color:var(--muted)}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1rem 1.25rem;margin-bottom:1rem}.row{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center;margin-bottom:.75rem}.row.between{justify-content:space-between}.btn{display:inline-flex;align-items:center;gap:.35rem;padding:.55rem .9rem;border-radius:8px;border:1px solid var(--border);background:#222733;color:var(--text);cursor:pointer;font:inherit}.btn.primary{background:var(--accent);border-color:transparent;color:#fff}.btn:disabled{opacity:.45;cursor:not-allowed}.muted{color:var(--muted)}.hint{margin:0;font-size:.9rem;color:var(--muted)}.hint a{color:var(--accent)}.preview-wrap{position:relative;background:#0b0d10;border-radius:8px;overflow:hidden;min-height:200px;display:flex;align-items:center;justify-content:center}#preview{max-width:100%;height:auto;display:block}#preview-label{position:absolute;left:.75rem;bottom:.5rem;margin:0;font-size:.85rem;text-shadow:0 1px 4px #000}.sliders label{display:flex;align-items:center;gap:.5rem;width:100%}.sliders input[type=range]{flex:1}.video-controls{margin-top:.75rem}.video-controls input[type=range]{flex:1}.progress-wrap{margin-bottom:.75rem}.progress-wrap progress{width:100%;height:8px}#progress-label{margin:.35rem 0 0;font-size:.85rem}h2{margin:0;font-size:1.1rem}#file-list{list-style:none;margin:0;padding:0;max-height:240px;overflow:auto}#file-list li{display:flex;align-items:center;gap:.5rem;margin-bottom:.35rem}.file-item{flex:1;text-align:left;background:#222733;border:1px solid var(--border);color:var(--text);border-radius:6px;padding:.45rem .65rem;cursor:pointer;font:inherit}.file-item.active{border-color:var(--accent)}.error{color:#f28b82;font-size:.85rem}