:root{--bg: #f4f5fb;--card: #ffffff;--ink: #1c2033;--muted: #6b7089;--line: #e4e6f0;--brand: #4f46e5;--brand-2: #7c3aed;--danger: #dc2626;--ok: #16a34a;--chip: #eef0ff;--shadow: 0 10px 30px rgba(30, 34, 70, .08);--radius: 16px}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%}body{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Segoe UI,Roboto,sans-serif;color:var(--ink);background:radial-gradient(1200px 500px at 80% -10%,rgba(124,58,237,.12),transparent 60%),radial-gradient(900px 400px at -10% 0%,rgba(79,70,229,.12),transparent 55%),var(--bg);line-height:1.55}.app{max-width:1080px;margin:0 auto;padding:28px 20px 48px}.hero{margin-bottom:22px}.hero-inner{display:flex;gap:16px;align-items:center}.logo{font-size:40px}h1{margin:0;font-size:26px;letter-spacing:.2px}.sub{margin:4px 0 0;color:var(--muted);max-width:640px}main{display:flex;flex-direction:column;gap:18px}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.muted{color:var(--muted)}.small{font-size:12.5px}b{font-weight:600}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid transparent;border-radius:10px;padding:9px 16px;font-size:14px;font-weight:600;cursor:pointer;background:#eef0f7;color:var(--ink);transition:transform .06s ease,background .15s ease,opacity .15s ease;-webkit-user-select:none;user-select:none}.btn:hover:not(:disabled){filter:brightness(.97)}.btn:active:not(:disabled){transform:translateY(1px)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff}.btn.danger{background:#fee2e2;color:var(--danger)}.btn.ghost{background:transparent;border-color:var(--line)}.btn.small{padding:6px 12px;font-size:13px;border-radius:8px}.btn.big{padding:12px 22px;font-size:15px}.dropzone{text-align:center;padding:64px 24px;border:2px dashed #c9cde4;background:#ffffffb3}.dropzone h2{margin:6px 0 4px}.drop-icon{font-size:54px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:18px;align-items:start}.file-row{display:flex;align-items:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}.file-name{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:46%}.preview{width:100%;max-height:62vh;background:#000;border-radius:12px;display:block}.timeline-actions{display:flex;align-items:center;gap:10px;margin-top:14px;flex-wrap:wrap}.now{font-variant-numeric:tabular-nums;background:var(--chip);border-radius:8px;padding:5px 10px;font-size:13px;font-weight:600;margin-right:auto}.timeline-wrap{margin-top:14px}.timeline{position:relative;height:22px;background:#e9ebf4;border-radius:12px;cursor:pointer;touch-action:none}.timeline.disabled{cursor:not-allowed}.timeline-played{position:absolute;left:0;top:0;bottom:0;border-radius:12px;background:linear-gradient(90deg,#a5b4fc,#6366f1);opacity:.5;pointer-events:none}.timeline-now{position:absolute;top:-4px;bottom:-4px;width:2px;background:var(--brand);border-radius:2px;pointer-events:none}.cut-marker{position:absolute;top:-7px;width:20px;height:20px;transform:translate(-50%);background:transparent;border:0;cursor:grab;padding:0;margin-left:0;touch-action:none}.cut-marker:active{cursor:grabbing}.cut-marker-dot{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:13px;height:13px;border-radius:50%;background:#fff;border:3px solid var(--danger);box-shadow:0 1px 4px #00000059;pointer-events:none}.cut-marker:focus-visible{outline:2px solid var(--brand);border-radius:50%}.timeline-times{display:flex;justify-content:space-between;margin-top:4px;font-size:11.5px;color:var(--muted);font-variant-numeric:tabular-nums}.hint{margin-top:10px}.segments{margin-top:16px}.seg-label{font-size:13px;font-weight:600;margin-bottom:8px}.seg-chips{display:flex;flex-wrap:wrap;gap:8px}.seg-chip{border:1px solid var(--line);background:var(--chip);border-radius:10px;padding:7px 12px;display:flex;flex-direction:column;min-width:120px}.seg-idx{font-weight:600;font-size:13px}.side-col h2{margin:0 0 12px;font-size:17px}.mode-group{display:flex;flex-direction:column;gap:8px}.mode{display:flex;gap:10px;align-items:flex-start;border:1.5px solid var(--line);border-radius:12px;padding:11px 12px;cursor:pointer;transition:border-color .15s ease,background .15s ease}.mode.active{border-color:var(--brand);background:#f4f5ff}.mode input{margin-top:4px;accent-color:var(--brand)}.mode b,.mode 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var(--line);border-radius:14px;padding:12px;display:flex;flex-direction:column;gap:10px;background:#fbfbfe}.result-card video{width:100%;max-height:220px;background:#000;border-radius:10px}.result-meta{display:flex;justify-content:space-between;align-items:center;gap:8px}.result-name{font-weight:600;font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.footer{margin-top:28px;text-align:center}@media (max-width: 860px){.workspace{grid-template-columns:1fr}.file-name{max-width:100%}}.taskbar{display:flex;gap:10px;padding:10px}.tab{flex:1;border:1px solid var(--line);background:#f7f8fc;border-radius:12px;padding:10px 16px;font-size:15px;font-weight:600;cursor:pointer;color:var(--muted);transition:all .15s ease}.tab.active{background:linear-gradient(135deg,var(--brand),var(--brand-2));border-color:transparent;color:#fff}.tab:disabled{opacity:.5;cursor:not-allowed}.speed-note{margin-top:12px;background:#eef2ff;border-radius:10px;padding:10px 12px}.field-label{display:block;font-size:13px;font-weight:600;margin:4px 0 6px}.target-row{display:flex;align-items:center;gap:10px}.text-input{flex:1;border:1.5px solid var(--line);border-radius:10px;padding:10px 12px;font-size:16px;font-variant-numeric:tabular-nums;outline:none;transition:border-color .15s ease;min-width:0}.text-input:focus{border-color:var(--brand)}.text-input:disabled{background:#f2f3f8}.ratio-preview{margin-top:12px;font-size:14px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}.ratio-badge{background:var(--chip);color:var(--brand);border-radius:999px;padding:3px 10px;font-size:12.5px;font-weight:600}.preset-row{margin-top:10px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}.chip-btn{border:1px solid var(--line);background:#fff;border-radius:999px;padding:5px 12px;font-size:12.5px;cursor:pointer;color:var(--ink)}.chip-btn:hover:not(:disabled){border-color:var(--brand);color:var(--brand)}.chip-btn:disabled{opacity:.5;cursor:not-allowed}.field-error{margin-top:8px;color:var(--danger);background:#fee2e2;border-radius:8px;padding:6px 10px}