:root{--c-bg:#f1f5f9;--c-card:#fff;--c-border:#e2e8f0;--c-text:#0f172a;--c-muted:#64748b;--c-primary:#2563eb;--c-primary-dark:#1d4ed8;--c-a5:#059669;--c-a4:#2563eb;--c-skip:#94a3b8;--c-merged:#7c3aed;--c-danger:#dc2626;--radius:10px;--shadow:0 1px 3px #0f172a14, 0 1px 2px #0f172a0a;--shadow-lg:0 18px 48px #0f172a40}*{box-sizing:border-box}[hidden]{display:none!important}html,body{margin:0;padding:0}body{background:var(--c-bg);color:var(--c-text);flex-direction:column;min-height:100vh;font-family:Segoe UI,PingFang SC,Microsoft YaHei,Noto Sans SC,sans-serif;font-size:15px;line-height:1.6;display:flex}body.modal-open{overflow:hidden}.app-header{color:#fff;background:linear-gradient(135deg,#1e3a8a 0%,#2563eb 100%);padding:28px 24px}.app-header-inner{width:min(1600px,100% - 40px);margin:0 auto}.app-header h1{letter-spacing:.5px;margin:0 0 4px;font-size:26px}.app-header p{opacity:.85;margin:0;font-size:13.5px}.app-main{flex-direction:column;flex:1;gap:20px;width:min(1600px,100% - 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var(--c-border);color:var(--c-text);cursor:pointer;background:#fff;border-radius:8px;padding:9px 18px;font-size:14px;font-weight:500;transition:background .15s,border-color .15s,color .15s}.btn:hover:not(:disabled){background:#f8fafc;border-color:#cbd5e1}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--c-primary);border-color:var(--c-primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--c-primary-dark);border-color:var(--c-primary-dark)}.status-bar{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);box-shadow:var(--shadow);color:var(--c-muted);align-items:center;min-height:44px;margin:0;padding:8px 16px;font-size:13.5px;display:flex}.hint{color:var(--c-muted);border:1px solid var(--c-border);background:#f8fafc;border-radius:8px;margin:10px 0 0;padding:8px 12px;font-size:13px}.file-list{grid-template-columns:repeat(auto-fill,minmax(min(100%,320px),1fr));gap:12px;margin:14px 0 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var(--c-primary);outline-offset:2px}.file-item.is-dragging,.thumb.is-dragging{opacity:.3;filter:grayscale(.5);border-style:dashed;border-color:#94a3b8}.file-item.is-drop-before,.file-item.is-drop-after,.thumb.is-drop-before,.thumb.is-drop-after{background:#eff6ff;border-color:#93c5fd;transition:box-shadow .12s,background .12s,border-color .12s}.file-item.is-drop-before,.thumb.is-drop-before{box-shadow:0 0 0 2px #2563eb59, inset 0 5px 0 -1px var(--c-primary)}.file-item.is-drop-after,.thumb.is-drop-after{box-shadow:0 0 0 2px #2563eb59, inset 0 -5px 0 -1px var(--c-primary)}.file-item.is-drop-before:before,.file-item.is-drop-after:after,.thumb.is-drop-before:before,.thumb.is-drop-after:after{content:"";background:var(--c-primary);color:#fff;z-index:3;pointer-events:none;border-radius:50%;justify-content:center;align-items:center;width:24px;height:24px;font-size:11px;font-weight:700;line-height:1;display:flex;position:absolute;left:50%;transform:translate(-50%);box-shadow:0 2px 8px 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