:root {
            /* Algebra Domain / Rose Theme override */
            --color-rose: #f43f5e;
            --color-rose-glow: rgba(244, 63, 94, 0.35);
            --color-accent: #f43f5e;
            --color-accent-glow: rgba(244, 63, 94, 0.35);

            --color-func: #10b981;
            /* Emerald for function */
            --color-rel: #f43f5e;
            /* Rose for relation */
            --color-domain: #38bdf8;
            /* Cyan for domain */
            --color-range: #a855f7;
            /* Purple for range */
        }

        /* Highlight active menu item */
        .sidebar-drawer .syllabus-item.active a {
            background: var(--color-rose) !important;
            box-shadow: 0 4px 20px var(--color-rose-glow) !important;
            color: var(--bg-color) !important;
        }

        .sidebar-drawer .syllabus-item.active a .syllabus-title {
            color: var(--bg-color) !important;
        }

        .sidebar-drawer .syllabus-item.active a .syllabus-desc {
            color: rgba(0, 0, 0, 0.6) !important;
        }

        section {
            margin-bottom: 6rem;
            scroll-margin-top: 2rem;
        }

        .section-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 1.75rem;
        }

        .section-tag {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.8rem;
            color: var(--color-rose);
            background: rgba(244, 63, 94, 0.1);
            padding: 4px 10px;
            border-radius: 6px;
            border: 1px solid rgba(244, 63, 94, 0.2);
            text-shadow: 0 0 5px var(--color-rose-glow);
        }

        .section-header h2 {
            font-size: 1.75rem;
            font-weight: 700;
        }

        .section-intro {
            color: var(--text-muted);
            margin-bottom: 2rem;
            line-height: 1.6;
            font-size: 1rem;
            max-width: 850px;
        }

        /* Status Banner */
        .status-banner {
            padding: 0.75rem 1rem;
            border-radius: 10px;
            font-size: 0.9rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-top: 1rem;
            animation: fadeIn 0.3s ease;
        }

        .status-banner.success {
            background: rgba(16, 185, 129, 0.1);
            color: #10b981;
            border: 1px solid rgba(16, 185, 129, 0.2);
        }

        .status-banner.error {
            background: rgba(244, 63, 94, 0.1);
            color: #f43f5e;
            border: 1px solid rgba(244, 63, 94, 0.2);
        }

        .btn-preset-group {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 1.5rem;
        }

        .btn-preset {
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid var(--card-border);
            color: var(--text-muted);
            padding: 8px 12px;
            border-radius: 8px;
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.85rem;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition-speed) ease;
        }

        .btn-preset:hover {
            color: var(--text-color);
            background: rgba(255, 255, 255, 0.05);
        }

        .btn-preset.active {
            background: rgba(244, 63, 94, 0.15);
            color: var(--color-rose);
            border-color: rgba(244, 63, 94, 0.3);
        }

        .panel-hint {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-top: 1.25rem;
            padding: 0.85rem 1rem;
            background: rgba(255, 255, 255, 0.02);
            border-radius: 10px;
            border: 1px solid var(--card-border);
        }

        .panel-hint svg {
            width: 18px;
            height: 18px;
            fill: var(--color-rose);
            flex-shrink: 0;
        }

        .panel-hint span {
            font-size: 1.0rem;
            color: #ffffff;
            line-height: 1.65;
        }