.ref-container {
            max-width: 860px;
            margin: 0 auto;
            padding: 24px;
        }

        .ref-intro {
            background: var(--card-bg);
            border-radius: 16px;
            padding: 24px;
            box-shadow: 0 4px 12px var(--shadow);
            margin-bottom: 24px;
            text-align: justify;
        }

        .ref-intro h2 {
            font-size: 20px;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 12px;
        }

        .ref-intro p {
            font-size: 15px;
            line-height: 1.9;
            color: var(--text-color);
            opacity: 0.9;
            margin: 0;
        }

        .ref-section {
            margin-bottom: 28px;
        }

        .ref-section-title {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 14px;
            padding-right: 4px;
        }

        .ref-section-title i {
            font-size: 20px;
        }

        .ref-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 14px;
        }

        @media (min-width: 640px) {
            .ref-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        .ref-card {
            background: var(--card-bg);
            border-radius: 14px;
            padding: 18px;
            box-shadow: 0 3px 10px var(--shadow);
            display: flex;
            flex-direction: column;
            gap: 8px;
            transition: transform 0.15s ease, box-shadow 0.15s ease;
        }

        .ref-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px var(--shadow);
        }

        .ref-card-name {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-color);
        }

        .ref-card-url {
            font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
            font-size: 12.5px;
            color: var(--primary-color);
            direction: ltr;
            text-align: left;
            word-break: break-all;
            background: rgba(127, 127, 127, 0.08);
            padding: 6px 8px;
            border-radius: 8px;
        }

        .ref-card-desc {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-color);
            opacity: 0.85;
            margin: 0;
            text-align: justify;
        }

        .ref-card-link {
            align-self: flex-start;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 4px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary-color);
            text-decoration: none;
        }

        .ref-card-link:hover {
            text-decoration: underline;
        }

        .ref-note {
            background: var(--card-bg);
            border-radius: 14px;
            padding: 18px;
            box-shadow: 0 3px 10px var(--shadow);
            font-size: 13.5px;
            line-height: 1.8;
            color: var(--text-color);
            opacity: 0.85;
            text-align: justify;
            margin-top: 8px;
        }