:root {
            --primary: #1d4ed8;
            --primary-dark: #1e40af;
            --primary-light: #eff6ff;
            --wecom: #07c160;
            --feishu: #0284c7;
            --dingtalk: #0089FF;
            --ad: #6366f1;
            --gray-50: #f8fafc;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-400: #9ca3af;
            --gray-500: #6b7280;
            --gray-600: #4b5563;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --gray-900: #111827;
            --white: #ffffff;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.06);
            --shadow-lg: 0 12px 28px -4px rgba(0,0,0,0.08);
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 16px;
            --transition: all 0.2s ease;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: var(--gray-800);
            background: var(--white);
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        .container {
            width: 100%;
            max-width: 1560px;
            margin: 0 auto;
            padding: 0 40px;
        }

        /* 导航 */
        .header {
            background: var(--white);
            border-bottom: 1px solid var(--gray-100);
            position: sticky;
            top: 0;
            z-index: 100;
            height: 64px;
            display: flex;
            align-items: center;
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            color: var(--gray-900);
            font-weight: 700;
            font-size: 17px;
            letter-spacing: -0.2px;
        }
        .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--white);
            font-size: 13px;
            font-weight: 700;
        }
        .header-right {
            display: flex;
            align-items: center;
            gap: 28px;
        }
        .header-nav {
            display: flex;
            gap: 24px;
        }
        .header-nav a {
            color: var(--gray-500);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: var(--transition);
        }
        .header-nav a:hover { color: var(--gray-900); }
        .header-phone {
            color: var(--primary);
            font-weight: 600;
            font-size: 15px;
            text-decoration: none;
        }

        /* Hero */
        .hero {
            padding: 72px 0 64px;
            text-align: center;
        }
        .hero-label {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 1.5px;
            text-transform: uppercase;
            color: var(--primary);
            background: var(--primary-light);
            padding: 5px 14px;
            border-radius: 20px;
            margin-bottom: 28px;
        }
        .hero h1 {
            font-size: 46px;
            font-weight: 800;
            color: var(--gray-900);
            letter-spacing: -1px;
            line-height: 1.15;
            margin-bottom: 16px;
        }
        .hero-desc {
            font-size: 17px;
            color: var(--gray-500);
            max-width: 620px;
            margin: 0 auto 40px;
            line-height: 1.7;
        }
        .hero-platforms {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 16px;
            margin-bottom: 36px;
        }
        .hero-platform-dot {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--white);
            border: 1px solid var(--gray-200);
            transition: var(--transition);
        }
        .hero-platform-dot img {
            width: 22px;
            height: 22px;
            object-fit: contain;
        }
        .hero-platform-plus {
            font-size: 16px;
            color: var(--gray-300);
            font-weight: 300;
        }
        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 14px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 12px 26px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            text-decoration: none;
            cursor: pointer;
            transition: var(--transition);
            border: 2px solid transparent;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--white);
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
        }
        .btn-outline {
            background: transparent;
            border-color: var(--gray-300);
            color: var(--gray-700);
        }
        .btn-outline:hover {
            background: var(--gray-50);
            border-color: var(--gray-400);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 13px;
            border-radius: var(--radius-md);
        }

        /* 通用板块 */
        .section {
            padding: 80px 0;
        }
        .section-gray {
            background: var(--gray-50);
        }
        .section-header {
            margin-bottom: 52px;
        }
        .section-header-center {
            text-align: center;
        }
        .section-label {
            display: inline-block;
            font-size: 11px;
            font-weight: 700;
            letter-spacing: 1.2px;
            text-transform: uppercase;
            color: var(--primary);
            margin-bottom: 14px;
        }
        .section-title {
            font-size: 30px;
            font-weight: 800;
            color: var(--gray-900);
            letter-spacing: -0.5px;
            margin-bottom: 10px;
        }
        .section-subtitle {
            font-size: 15px;
            color: var(--gray-500);
            max-width: 560px;
            line-height: 1.6;
        }
        .section-subtitle-center {
            margin: 0 auto;
        }

        /* 核心优势 */
        .advantages-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .advantage-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            border: 1px solid var(--gray-100);
            transition: var(--transition);
        }
        .advantage-card:hover {
            border-color: var(--gray-200);
            box-shadow: var(--shadow-lg);
        }
        .advantage-card .ac-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 20px;
            margin-bottom: 20px;
        }
        .advantage-card h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--gray-900);
            margin-bottom: 10px;
            letter-spacing: -0.2px;
        }
        .advantage-card p {
            font-size: 14px;
            color: var(--gray-500);
            line-height: 1.7;
        }

        /* 架构图 - 横向四列撑满 */
        .architecture-horizontal {
            display: grid;
            grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
            align-items: center;
            gap: 0;
        }
        .arch-item {
            background: var(--white);
            border: 1px solid var(--gray-100);
            border-radius: var(--radius-lg);
            padding: 28px 20px;
            text-align: center;
        }
        .arch-item h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--gray-900);
            margin-bottom: 6px;
        }
        .arch-item p {
            font-size: 14px;
            color: var(--gray-500);
            line-height: 1.5;
        }
        .arch-item-im { border-left: 3px solid var(--primary); }
        .arch-item-idaas { border-left: 3px solid #10b981; }
        .arch-item-ldap { border-left: 3px solid var(--ad); }
        .arch-item-nas { border-left: 3px solid var(--primary); background: var(--primary-light); }
        .arch-arrow-h {
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--gray-300);
            padding: 0 16px;
        }

        /* LDAP/AD + 账号源 */
        .tech-requirements {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-top: 40px;
        }
        .tech-req-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 28px;
            border: 1px solid var(--gray-100);
        }
        .tech-req-card h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--gray-900);
            margin-bottom: 12px;
        }
        .tech-req-card ul {
            list-style: none;
            font-size: 14px;
            color: var(--gray-600);
        }
        .tech-req-card ul li {
            padding: 5px 0;
            padding-left: 18px;
            position: relative;
            line-height: 1.6;
        }
        .tech-req-card ul li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 11px;
            width: 5px;
            height: 5px;
            border-radius: 50%;
            background: var(--gray-300);
        }

        /* 技术对比表 */
        .tech-table-wrap {
            margin-top: 40px;
            overflow-x: auto;
        }
        .tech-table {
            width: 100%;
            border-collapse: collapse;
            background: var(--white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--gray-100);
        }
        .tech-table thead th {
            background: var(--gray-900);
            color: var(--white);
            padding: 14px 20px;
            text-align: left;
            font-weight: 600;
            font-size: 13px;
            letter-spacing: 0.3px;
        }
        .tech-table tbody td {
            padding: 13px 20px;
            border-bottom: 1px solid var(--gray-50);
            font-size: 14px;
            color: var(--gray-600);
        }
        .tech-table tbody tr:last-child td { border-bottom: none; }
        .tech-table .col-feature {
            font-weight: 600;
            color: var(--gray-800);
            background: var(--gray-50);
            width: 180px;
        }
        .tech-table .col-advantage {
            color: #059669;
            font-weight: 500;
        }

        /* 三平台卡片 - 强化版 */
        .platform-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .platform-card {
            background: var(--white);
            border-radius: var(--radius-xl);
            padding: 36px 32px 28px;
            border: 1px solid var(--gray-200);
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            box-shadow: var(--shadow-sm);
        }
        .platform-card:hover {
            border-color: transparent;
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .platform-card .pc-icon {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }
        .platform-card .pc-icon img {
            width: 24px;
            height: 24px;
            object-fit: contain;
            filter: brightness(0) invert(1);
        }
        .pc-wecom .pc-icon { background: var(--wecom); }
        .pc-feishu .pc-icon { background: var(--feishu); }
        .pc-dingtalk .pc-icon { background: var(--dingtalk); }
        .platform-card h3 {
            font-size: 21px;
            font-weight: 700;
            margin-bottom: 6px;
            letter-spacing: -0.2px;
        }
        .platform-card .pc-tagline {
            font-size: 14px;
            color: var(--gray-500);
            margin-bottom: 18px;
            line-height: 1.5;
        }
        .platform-card .pc-points {
            list-style: none;
            font-size: 14px;
            color: var(--gray-600);
            margin-bottom: 24px;
            flex: 1;
        }
        .platform-card .pc-points li {
            padding: 5px 0;
            padding-left: 18px;
            position: relative;
            line-height: 1.5;
        }
        .platform-card .pc-points li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 11px;
            width: 5px;
            height: 5px;
            border-radius: 50%;
            background: var(--gray-300);
        }
        .pc-arrow {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
        }
        .pc-wecom .pc-arrow { color: var(--wecom); }
        .pc-feishu .pc-arrow { color: var(--feishu); }
        .pc-dingtalk .pc-arrow { color: var(--dingtalk); }

        /* 试用提示条 */
        .trial-banner {
            background: var(--primary-light);
            border: 1px solid #dbeafe;
            border-radius: var(--radius-lg);
            padding: 22px 28px;
            text-align: center;
            margin-top: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }
        .trial-banner .tb-text {
            font-size: 16px;
            font-weight: 600;
            color: var(--primary);
        }
        .trial-banner .tb-text i {
            margin-right: 6px;
        }

        /* FAQ */
        .faq-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }
        .faq-item {
            background: var(--white);
            border: 1px solid var(--gray-100);
            border-radius: var(--radius-md);
            padding: 18px 20px;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--gray-200);
            box-shadow: var(--shadow-sm);
        }
        .faq-item .faq-q {
            font-size: 14px;
            font-weight: 600;
            color: var(--gray-900);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .faq-item .faq-a {
            font-size: 13px;
            color: var(--gray-500);
            line-height: 1.6;
        }

        /* CTA */
        .cta {
            background: var(--gray-900);
            text-align: center;
            padding: 72px 0;
        }
        .cta h3 {
            font-size: 30px;
            font-weight: 800;
            color: var(--white);
            letter-spacing: -0.5px;
            margin-bottom: 10px;
        }
        .cta p {
            font-size: 15px;
            color: var(--gray-400);
            max-width: 500px;
            margin: 0 auto 32px;
            line-height: 1.6;
        }
        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 14px;
            flex-wrap: wrap;
        }
        .btn-white {
            background: var(--white);
            color: var(--primary);
            border-color: var(--white);
        }
        .btn-white:hover { background: var(--gray-100); }
        .btn-ghost {
            background: transparent;
            color: var(--white);
            border-color: var(--gray-600);
        }
        .btn-ghost:hover { border-color: var(--gray-400); background: rgba(255,255,255,0.03); }

        /* 页脚 */
        .footer {
            background: var(--gray-50);
            text-align: center;
            padding: 32px 0;
            color: var(--gray-400);
            font-size: 13px;
            border-top: 1px solid var(--gray-100);
        }

        /* 响应式 */
        @media (max-width: 1200px) {
            .faq-grid { grid-template-columns: repeat(2, 1fr); }
            .architecture-horizontal { gap: 0; }
            .arch-arrow-h { padding: 0 8px; font-size: 18px; }
            .arch-item { padding: 22px 16px; }
        }
        @media (max-width: 1024px) {
            .advantages-grid { grid-template-columns: 1fr; }
            .platform-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
            .tech-requirements { grid-template-columns: 1fr; }
            .faq-grid { grid-template-columns: 1fr; max-width: 600px; margin: 0 auto; }
            .architecture-horizontal {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .arch-arrow-h { transform: rotate(90deg); padding: 4px 0; }
        }
        @media (max-width: 768px) {
            .container { padding: 0 20px; }
            .hero { padding: 56px 0 48px; }
            .hero h1 { font-size: 32px; letter-spacing: -0.5px; }
            .hero-desc { font-size: 15px; }
            .section { padding: 60px 0; }
            .section-title { font-size: 26px; }
            .advantage-card { padding: 28px 24px; }
            .platform-card { padding: 28px 24px 24px; }
            .platform-card h3 { font-size: 19px; }
            .cta { padding: 56px 24px; }
            .cta h3 { font-size: 26px; }
            .header-right { gap: 16px; }
            .header-nav { display: none; }
            .trial-banner { flex-direction: column; text-align: center; }
        }