:root{--bg-primary: #ffffff;--bg-secondary: #f8fafc;--bg-tertiary: #f1f5f9;--bg-elevated: #ffffff;--text-primary: #1e293b;--text-secondary: #475569;--text-muted: #94a3b8;--accent-primary: #23a8d5;--accent-primary-hover: #1a8fb8;--accent-secondary: #00597a;--accent-gold: #f59e0b;--accent-gold-hover: #d97706;--accent-navy: #073445;--border-color: #e2e8f0;--border-subtle: #f1f5f9;--success: #22c55e;--warning: #f59e0b;--error: #ef4444;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06);--shadow-md: 0 4px 16px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .12);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--sidebar-width: 540px;--toolbar-height: 48px;--resizer-width: 5px;--sidebar-min-width: 200px;--sidebar-max-width: 600px;--font-sans: "Plus Jakarta Sans", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, 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#e05252)}.btn-icon-small{width:24px;height:24px;background:transparent;border:none;color:var(--text-secondary);cursor:pointer;font-size:1.2rem;line-height:1}.btn-icon-small:hover{color:var(--text-primary)}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);display:flex;align-items:center;gap:12px;padding:14px 20px;background:var(--bg-elevated);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:1000;animation:slideUp .3s ease}.toast.error{border:1px solid var(--error)}.toast.info{border:1px solid var(--accent-primary);max-width:480px}.toast.warning{border:1px solid var(--warning);bottom:80px}.toast-action-link{color:var(--accent-primary);font-weight:600;text-decoration:none;white-space:nowrap}.toast-action-link:hover{text-decoration:underline}@keyframes slideUp{0%{opacity:0;transform:translate(-50%) translateY(20px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.drop-zone{border:2px dashed var(--border-color);border-radius:var(--radius-lg);padding:60px 40px;cursor:pointer;transition:all .3s ease;background:var(--bg-secondary)}.drop-zone:hover,.drop-zone.drag-over{border-color:var(--accent-primary);background:var(--bg-tertiary);transform:translateY(-2px);box-shadow:var(--shadow-md),0 0 40px 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