/* Extracted from guides/reference-tracks-guide.html — keep in sync if structure changes. */
        .reference-hero {
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(139, 92, 246, 0.05));
            border-bottom: 1px solid var(--border-color);
            padding: 4rem 0;
            text-align: center;
            position: relative;
            z-index: 2;
        }

        .reference-hero h1 {
            font-size: 2.5rem;
            margin-bottom: 0.5rem;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .reference-hero p {
            color: var(--muted-text);
            font-size: 1.1rem;
        }

        .section-card {
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(139, 92, 246, 0.05));
            border: 2px solid var(--border-color);
            padding: 2rem;
            margin-bottom: 2rem;
            border-radius: 12px;
            transition: var(--transition);
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        .section-card:hover {
            border-color: var(--primary-color);
            box-shadow: 0 6px 12px rgba(0, 212, 255, 0.2);
        }

        .section-card h3 { color: var(--primary-color); margin-bottom: 1.5rem; font-size: 1.8rem; padding-bottom: 0.75rem; border-bottom: 3px solid var(--primary-color); display: inline-block; width: 100%; }
        .section-card h4 { color: var(--primary-color); margin-top: 2rem; margin-bottom: 1rem; font-size: 1.3rem; padding-left: 0.5rem; border-left: 4px solid var(--secondary-color); }
        .section-card p { color: var(--muted-text); line-height: 1.8; margin-bottom: 1.2rem; }
        .section-card ul { color: var(--muted-text); line-height: 2; margin-left: 1.5rem; }
        .section-card li { margin-bottom: 1rem; padding-left: 0.5rem; }
        .section-card li::marker { color: var(--primary-color); font-weight: bold; }

        .tips-box {
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(139, 92, 246, 0.1));
            border-left: 5px solid var(--primary-color);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 2rem 0;
            box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
        }

        .tips-box strong { color: var(--primary-color); font-size: 1.05rem; }

        .parameter-box {
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(139, 92, 246, 0.1));
            border-left: 5px solid var(--accent-purple);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 2rem 0;
            box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
        }

        .parameter-box strong { color: var(--accent-purple); font-size: 1.05rem; }

        .back-link { margin-bottom: 2rem; }
        .back-link a { color: var(--primary-color); text-decoration: none; display: inline-flex; align-items: center; gap: 5px; font-weight: 500; transition: var(--transition); }
        .back-link a:hover { color: var(--secondary-color); }

        @media (max-width: 768px) { .reference-hero h1 { font-size: 1.8rem; } }

        .toc-nav { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1rem; margin: 2rem 0 3rem; padding: 0; }
        .toc-item { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 1.2rem 0.8rem; background: linear-gradient(135deg, rgba(0, 212, 255, 0.06), rgba(139, 92, 246, 0.06)); border: 1px solid var(--border-color); border-radius: 10px; text-decoration: none; color: var(--muted-text); transition: var(--transition); font-size: 0.85rem; line-height: 1.3; }
        .toc-item:hover { border-color: var(--primary-color); transform: translateY(-4px); box-shadow: 0 8px 20px rgba(0, 212, 255, 0.15); color: var(--primary-color); }
        .toc-icon { font-size: 2rem; margin-bottom: 0.5rem; display: block; }
        @media (max-width: 480px) { .toc-nav { grid-template-columns: repeat(2, 1fr); } }