/* ============================================================
           关于我们
           ============================================================ */
        .about-header {
            text-align: center;
        }
        .about-header h1 {
            font-size: 32px;
            font-weight: 700;
            color: #1a202c;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            margin-bottom: 8px;
        }
        .about-header h1 i {
            color: #4a6cf7;
            background: rgba(74, 108, 247, 0.10);
            padding: 8px 12px;
            border-radius: 12px;
        }
        .about-header p {
            font-size: 16px;
            color: #718096;
        }

        .about-section {
            background: #ffffff;
            border-radius: 16px;
            border: 1px solid #eef2f6;
            padding: 28px 32px;
            margin-bottom: 20px;
            box-shadow: 0 1px 4px rgba(0,0,0,0.02);
        }
        .about-section .section-title {
            font-size: 20px;
            font-weight: 600;
            color: #1a202c;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .about-section .section-title i {
            color: #4a6cf7;
        }
        .about-section .section-content {
            font-size: 15px;
            color: #4a5568;
            line-height: 1.9;
        }
        .about-section .section-content p {
            margin-bottom: 10px;
        }
        .about-section .section-content ul {
            padding-left: 22px;
            margin: 8px 0;
            list-style: disc;
        }
        .about-section .section-content ul li {
            margin-bottom: 6px;
        }

        .stats-grid-about {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 14px;
            margin-top: 12px;
        }
        @media (max-width: 768px) {
            .stats-grid-about { grid-template-columns: repeat(2, 1fr); }
        }
        .stat-card-about {
            background: #f7fafc;
            border-radius: 12px;
            padding: 20px 12px;
            text-align: center;
            border: 1px solid #edf2f7;
            transition: all 0.25s ease;
        }
        .stat-card-about:hover {
            border-color: #4a6cf7;
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(74,108,247,0.06);
        }
        .stat-card-about .stat-icon {
            font-size: 26px;
            color: #4a6cf7;
            display: block;
            margin-bottom: 6px;
        }
        .stat-card-about .stat-number {
            font-size: 26px;
            font-weight: 700;
            color: #4a6cf7;
            display: block;
        }
        .stat-card-about .stat-label {
            font-size: 13px;
            color: #718096;
            margin-top: 4px;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin-top: 8px;
        }
        @media (max-width: 768px) {
            .feature-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 480px) {
            .feature-grid { grid-template-columns: 1fr; }
        }
        .feature-item {
            background: #f7fafc;
            border-radius: 12px;
            padding: 20px 16px;
            text-align: center;
            border: 1px solid #edf2f7;
            transition: all 0.25s ease;
        }
        .feature-item:hover {
            border-color: #4a6cf7;
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(74,108,247,0.06);
        }
        .feature-item .feature-icon {
            font-size: 36px;
            color: #4a6cf7;
            display: block;
            margin-bottom: 8px;
        }
        .feature-item .feature-title {
            font-size: 15px;
            font-weight: 600;
            color: #1a202c;
        }
        .feature-item .feature-desc {
            font-size: 13px;
            color: #718096;
            margin-top: 4px;
        }

        /* ============================================================
           API 接口推广区块
           ============================================================ */
        .api-promo {
            background: linear-gradient(135deg, #4a6cf7 0%, #7c3aed 50%, #a855f7 100%);
            border-radius: 16px;
            padding: 32px 36px;
            color: #fff;
            margin-bottom: 20px;
            position: relative;
            overflow: hidden;
            box-shadow: 0 12px 40px rgba(74, 108, 247, 0.25);
        }
        .api-promo::before {
            content: '';
            position: absolute;
            top: -50%; right: -10%;
            width: 400px; height: 400px;
            background: radial-gradient(circle, rgba(255,255,255,0.15), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .api-promo::after {
            content: '';
            position: absolute;
            bottom: -60%; left: -10%;
            width: 300px; height: 300px;
            background: radial-gradient(circle, rgba(255,255,255,0.1), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .api-promo-inner {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }
        .api-promo h2 {
            font-size: 26px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .api-promo p {
            font-size: 15px;
            color: rgba(255,255,255,0.9);
            margin: 0;
            line-height: 1.7;
            max-width: 560px;
        }
        .api-promo .api-tags {
            display: flex;
            gap: 8px;
            margin-top: 14px;
            flex-wrap: wrap;
        }
        .api-promo .api-tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: rgba(255,255,255,0.18);
            color: #fff;
            padding: 4px 14px;
            border-radius: 30px;
            font-size: 12px;
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255,255,255,0.2);
        }
        .api-promo .api-btn-group {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .api-promo .api-btn {
            padding: 12px 28px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            font-size: 14px;
            transition: all 0.25s;
            white-space: nowrap;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .api-promo .api-btn-primary {
            background: #fff;
            color: #4a6cf7;
            box-shadow: 0 4px 16px rgba(0,0,0,0.1);
        }
        .api-promo .api-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(0,0,0,0.2);
            color: #3a5cd9;
        }
        .api-promo .api-btn-outline {
            background: rgba(255,255,255,0.15);
            color: #fff;
            border: 1px solid rgba(255,255,255,0.3);
            backdrop-filter: blur(4px);
        }
        .api-promo .api-btn-outline:hover {
            background: rgba(255,255,255,0.25);
            color: #fff;
        }

        .api-features {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 12px;
            margin-top: 18px;
        }
        @media (max-width: 900px) {
            .api-features { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 480px) {
            .api-features { grid-template-columns: 1fr; }
        }
        .api-feature {
            background: rgba(255,255,255,0.12);
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255,255,255,0.18);
            border-radius: 10px;
            padding: 12px 14px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .api-feature i {
            font-size: 22px;
            color: #fff;
            opacity: 0.9;
            flex-shrink: 0;
        }
        .api-feature .api-feature-text strong {
            display: block;
            font-size: 13px;
            color: #fff;
            font-weight: 600;
        }
        .api-feature .api-feature-text span {
            display: block;
            font-size: 11px;
            color: rgba(255,255,255,0.75);
            margin-top: 1px;
        }

        /* ============================================================
           联系方式
           ============================================================ */
        .contact-info {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-top: 8px;
        }
        .contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
            background: #f7fafc;
            padding: 12px 20px;
            border-radius: 10px;
            border: 1px solid #edf2f7;
            transition: all 0.25s;
        }
        .contact-item:hover {
            border-color: #4a6cf7;
            background: #f0f5ff;
        }
        .contact-item i {
            font-size: 20px;
            color: #4a6cf7;
        }
        .contact-item span {
            font-size: 14px;
            color: #4a5568;
        }
        .contact-item a {
            color: #4a6cf7;
            text-decoration: none;
        }
        .contact-item a:hover {
            text-decoration: underline;
        }
        @media (max-width: 768px) {
            /* 手机端：隐藏整个 navbar 行 */
            .header-banner .dh-navbar {
                display: none !important;
            }
            /* 让 .header-banner 不再留底部空白 */
            .header-banner {
                padding-bottom: 0 !important;
            }
        }
        /* 深色模式 */
        body.dark-mode .about-header h1 { color: #e2e8f0; }
        body.dark-mode .about-header p { color: #a0aec0; }
        body.dark-mode .about-section { background: #16213e; border-color: #2a3a5a; }
        body.dark-mode .about-section .section-title { color: #e2e8f0; }
        body.dark-mode .about-section .section-content { color: #cbd5e0; }
        body.dark-mode .stat-card-about { background: #1a2a4a; border-color: #2a3a5a; }
        body.dark-mode .stat-card-about .stat-label { color: #a0aec0; }
        body.dark-mode .feature-item { background: #1a2a4a; border-color: #2a3a5a; }
        body.dark-mode .feature-item .feature-title { color: #e2e8f0; }
        body.dark-mode .feature-item .feature-desc { color: #a0aec0; }
        body.dark-mode .contact-item { background: #1a2a4a; border-color: #2a3a5a; }
        body.dark-mode .contact-item span { color: #cbd5e0; }

        @media (max-width: 768px) {
            .about-header h1 { font-size: 26px; }
            .about-section { padding: 20px 18px; }
            .about-section .section-title { font-size: 17px; }
            .api-promo { padding: 24px 20px; }
            .api-promo h2 { font-size: 20px; }
            .api-promo p { font-size: 14px; }
            .api-promo .api-btn { padding: 10px 20px; font-size: 13px; }
            .contact-info { flex-direction: column; gap: 10px; }
        }