:root{--bg-deep: #f6f8fa;--bg-surface: #ffffff;--bg-elevated: #eef2f5;--bg-input: #f6f8fa;--bg-hover: #edf1f4;--border: #dce2e8;--border-subtle: #e6ebef;--border-hover: #c8d0d8;--border-focus: #0891b2;--accent: #0891b2;--accent-dim: #0e7490;--accent-glow: rgba(8, 145, 178, .1);--violet: #7c5cfc;--violet-dim: rgba(124, 92, 252, .1);--blue: #3b82f6;--blue-dim: rgba(59, 130, 246, .08);--green: #22c55e;--green-dim: rgba(34, 197, 94, .08);--red: #ef4444;--red-dim: rgba(239, 68, 68, .08);--orange: #f59e0b;--text-primary: #1a1a1a;--text-secondary: #64748b;--text-dim: #94a3b8;--text-inverse: #ffffff;--font-body: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;--font-mono: "IBM Plex Mono", "Fira Code", monospace;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 100px;--shadow-card: 0 1px 3px rgba(0, 0, 0, .04), 0 1px 2px rgba(0, 0, 0, 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var(--ease-out)}.lightbox-close{position:absolute;top:20px;right:24px;color:var(--text-secondary);font-size:28px;cursor:pointer;background:none;border:none;transition:color .2s}.lightbox-close:hover{color:var(--text-primary)}input[type=checkbox]{accent-color:var(--accent);width:16px;height:16px;cursor:pointer}select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%2394a3b8' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px!important}.upload-layout{display:flex;gap:0;height:calc(100vh - 80px);margin:-24px -32px}.upload-left-panel{width:320px;min-width:320px;border-right:1px solid var(--border);background:var(--bg-surface);padding:20px 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transparent;margin-bottom:4px}.upload-session-card:hover{background:var(--bg-hover);border-color:var(--border)}.upload-session-card--selected{background:var(--accent-glow);border-color:var(--accent);box-shadow:var(--shadow-glow-accent)}.upload-session-card--selected:hover{background:var(--accent-glow);border-color:var(--accent)}.upload-session-thumb{width:52px;height:52px;border-radius:var(--radius-sm);object-fit:cover;flex-shrink:0;border:1px solid var(--border)}.upload-session-thumb--empty{background:var(--bg-elevated);display:flex;align-items:center;justify-content:center;color:var(--text-dim);font-size:.6rem}.upload-right-wrapper{flex:1;display:flex;flex-direction:column;overflow:hidden;background:var(--bg-deep)}.upload-right-panel{flex:1;overflow-y:auto;padding:24px 32px}.upload-sticky-footer{flex-shrink:0;padding:16px 32px;background:var(--bg-surface);border-top:1px solid var(--border);box-shadow:0 -4px 16px #0000000a}.upload-sticky-footer 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