:root{--bg:#f5f7fa;--card:#ffffff;--border:#e5e7eb;--text:#1f2937;--muted:#6b7280;--accent:#2563eb;--accent-soft:#eff4ff;--green:#16a34a;--amber:#d97706;--red:#dc2626}
*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
.container{max-width:1200px;margin:0 auto;padding:24px 20px 60px}
a{color:var(--accent);text-decoration:none}
.top{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px;flex-wrap:wrap}
.top h1{font-size:22px;margin:0;color:var(--text)}.top h1 .sub{font-size:13px;color:var(--muted);font-weight:400}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px;margin-bottom:18px;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.card h2{margin:0 0 14px;font-size:15px;color:var(--text)}
.upload-zone{border:2px dashed var(--border);border-radius:12px;padding:28px;text-align:center;cursor:pointer;transition:.15s;background:#fff}
.upload-zone:hover{border-color:var(--accent)}
.upload-zone.drag{border-color:var(--accent);background:var(--accent-soft)}
.upload-zone .big{font-size:15px}.upload-zone .hint{font-size:12px;color:var(--muted);margin-top:6px}
.form-row{margin-bottom:14px}
.form-row label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}
.form-row input[type=text]{width:100%;padding:9px 12px;border-radius:8px;border:1px solid var(--border);background:#fff;color:var(--text);font-size:14px}
.form-row input:focus{outline:none;border-color:var(--accent)}
.progress{height:6px;background:var(--border);border-radius:3px;overflow:hidden;margin-top:12px;display:none}
.progress .bar{height:100%;width:0;background:var(--accent);transition:width .2s}
.list{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.vitem{border:1px solid var(--border);border-radius:10px;padding:12px;cursor:pointer;transition:.15s;position:relative;background:#fff}
.vitem:hover{border-color:var(--accent);box-shadow:0 2px 8px rgba(37,99,235,.08)}
.vitem.active{border-color:var(--accent);background:var(--accent-soft)}
.vitem .name{font-size:14px;font-weight:600;word-break:break-all;margin-bottom:6px;color:var(--text)}
.badge{display:inline-block;padding:2px 10px;border-radius:999px;font-size:11px;border:1px solid var(--border);background:#f9fafb}
.badge.pending{color:var(--muted)}.badge.processing{color:var(--amber);border-color:rgba(217,119,6,.35);background:#fff7ed}.badge.done{color:var(--green);border-color:rgba(22,163,74,.35);background:#f0fdf4}.badge.error{color:var(--red);border-color:rgba(220,38,38,.35);background:#fef2f2}
.player-wrap{display:flex;gap:16px;flex-wrap:wrap}
.video-box{flex:1;min-width:320px}.video-box video{width:100%;border-radius:12px;background:#000;aspect-ratio:16/9}
.chapter-box{width:300px;max-width:100%}
.chapter-box h3{margin:0 0 10px;font-size:14px;color:var(--muted)}
.chapter-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:8px;cursor:pointer;margin-bottom:6px;border:1px solid transparent}
.chapter-item:hover{background:#f3f4f6}
.chapter-item.active{background:var(--accent-soft);border-color:var(--accent)}
.chapter-item .no{flex-shrink:0;min-width:28px;height:28px;padding:0 8px;border-radius:6px;background:#f3f4f6;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;white-space:nowrap;color:var(--accent)}
.chapter-item .t{flex:1;font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text)}
.chapter-item .tm{font-size:11px;color:var(--muted);flex-shrink:0}
.empty{color:var(--muted);padding:30px 0;text-align:center;font-size:13px}
.btn{padding:7px 14px;border-radius:8px;border:1px solid var(--border);background:#fff;color:var(--text);cursor:pointer;font-size:13px}
.btn:hover{border-color:var(--accent);color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{color:#fff;opacity:.9}
.btn.danger{color:var(--red)}.btn.danger:hover{border-color:var(--red);color:var(--red)}
.btn.sm{font-size:12px;padding:4px 10px}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.actions{margin-top:10px;display:flex;gap:8px;flex-wrap:wrap}
.actions .btn{font-size:12px;padding:4px 10px}
@media(max-width:800px){.chapter-box{width:100%}}