/* roulang page: index */
:root {
            --primary: #0B4F6C;
            --primary-dark: #083D53;
            --primary-deeper: #072F40;
            --primary-light: #0E6385;
            --accent: #D4A373;
            --accent-dark: #C08B5C;
            --accent-light: #E0B98A;
            --surface: #F8FAFC;
            --card: #FFFFFF;
            --card-light: #F1F5F9;
            --footer-bg: #1E293B;
            --footer-text: #CBD5E1;
            --nav-text: #334155;
            --body-text: #475569;
            --heading-text: #1E293B;
            --border-light: #E2E8F0;
            --border-subtle: #F1F5F9;
            --radius-card: 12px;
            --radius-btn: 8px;
            --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 10px 15px -3px rgba(0, 0, 0, 0.08);
            --shadow-card-hover: 0 10px 25px -5px rgba(0, 0, 0, 0.12), 0 18px 30px -8px rgba(0, 0, 0, 0.10);
            --shadow-card-lg: 0 8px 16px -4px rgba(0, 0, 0, 0.06), 0 16px 24px -6px rgba(0, 0, 0, 0.09);
            --transition-smooth: 0.3s ease;
            --transition-fast: 0.2s ease;
            --container-max: 1280px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            margin: 0;
            padding: 0;
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Noto Sans SC', 'system-ui', sans-serif;
            font-size: 1.125rem;
            line-height: 1.7;
            color: var(--body-text);
            background-color: var(--surface);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        input {
            font-family: inherit;
        }

        /* 容器 */
        .container-custom {
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }
        @media (min-width: 640px) {
            .container-custom {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }
        @media (min-width: 1024px) {
            .container-custom {
                padding-left: 3rem;
                padding-right: 3rem;
            }
        }

        /* 导航栏 */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
            transition: box-shadow var(--transition-fast);
        }
        .site-header.scrolled {
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        @media (min-width: 640px) {
            .nav-inner {
                padding: 0 2rem;
            }
        }
        @media (min-width: 1024px) {
            .nav-inner {
                padding: 0 3rem;
            }
        }
        .nav-logo {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            transition: color var(--transition-fast);
            text-decoration: none;
        }
        .nav-logo:hover {
            color: var(--primary-dark);
        }
        .nav-logo-icon {
            width: 34px;
            height: 34px;
            border-radius: 8px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .nav-links {
            display: none;
            align-items: center;
            gap: 0.25rem;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        @media (min-width: 1024px) {
            .nav-links {
                display: flex;
            }
        }
        .nav-links a {
            display: inline-block;
            padding: 0.5rem 1rem;
            color: var(--nav-text);
            font-size: 0.95rem;
            font-weight: 500;
            border-radius: 6px;
            transition: color var(--transition-fast), background var(--transition-fast);
            position: relative;
            text-decoration: none;
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: var(--primary);
            background: rgba(11, 79, 108, 0.04);
        }
        .nav-links a.nav-active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav-links a.nav-active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 2px;
            background: var(--primary);
            border-radius: 1px;
        }
        .nav-cta-btn {
            display: none;
            background: var(--primary);
            color: #fff !important;
            padding: 0.6rem 1.5rem !important;
            border-radius: var(--radius-btn) !important;
            font-weight: 600 !important;
            font-size: 0.9rem !important;
            transition: all var(--transition-fast) !important;
            box-shadow: var(--shadow-card);
            white-space: nowrap;
            text-decoration: none;
        }
        @media (min-width: 1024px) {
            .nav-cta-btn {
                display: inline-block;
            }
        }
        .nav-cta-btn:hover {
            background: var(--primary-deeper) !important;
            box-shadow: 0 6px 20px rgba(11, 79, 108, 0.30) !important;
            transform: translateY(-1px);
        }

        /* 汉堡菜单 */
        .hamburger {
            display: flex;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 8px;
            z-index: 60;
            background: none;
            border: none;
            outline: none;
        }
        @media (min-width: 1024px) {
            .hamburger {
                display: none;
            }
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--nav-text);
            border-radius: 2px;
            transition: all var(--transition-fast);
        }
        .hamburger.open span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.open span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* 移动端菜单 */
        .mobile-menu {
            display: none;
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            bottom: 0;
            background: #fff;
            z-index: 45;
            padding: 1.5rem;
            flex-direction: column;
            gap: 0.5rem;
            overflow-y: auto;
        }
        .mobile-menu.open {
            display: flex;
        }
        @media (min-width: 1024px) {
            .mobile-menu {
                display: none !important;
            }
        }
        .mobile-menu a {
            display: block;
            padding: 0.85rem 1.2rem;
            font-size: 1.1rem;
            font-weight: 500;
            color: var(--nav-text);
            border-radius: 8px;
            transition: all var(--transition-fast);
            text-decoration: none;
        }
        .mobile-menu a:hover {
            background: rgba(11, 79, 108, 0.05);
            color: var(--primary);
        }
        .mobile-menu .mobile-cta {
            background: var(--primary);
            color: #fff !important;
            text-align: center;
            border-radius: var(--radius-btn);
            font-weight: 600;
            margin-top: 0.5rem;
        }
        .mobile-menu .mobile-cta:hover {
            background: var(--primary-deeper) !important;
            color: #fff !important;
        }

        /* Hero 哈希点阵纹理 */
        .hero-bg-pattern {
            position: absolute;
            inset: 0;
            pointer-events: none;
            background-image: radial-gradient(circle, rgba(255, 255, 255, 0.07) 1px, transparent 1px);
            background-size: 20px 20px;
            z-index: 1;
        }
        @media (min-width: 768px) {
            .hero-bg-pattern {
                background-size: 24px 24px;
            }
        }

        /* 卡片悬停上浮 */
        .card-hover-lift {
            transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
        }
        .card-hover-lift:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
        }
        @media (max-width: 639px) {
            .card-hover-lift:hover {
                transform: none;
                box-shadow: var(--shadow-card);
            }
        }

        /* 案例卡片竖线 */
        .case-card {
            border-left: 4px solid var(--accent);
            padding-left: 1.5rem;
            transition: all var(--transition-smooth);
        }
        .case-card:hover {
            border-left-color: var(--primary);
            background: #fff;
            box-shadow: var(--shadow-card);
        }

        /* FAQ 手风琴 */
        .faq-item {
            border-bottom: 1px solid var(--border-subtle);
            overflow: hidden;
        }
        .faq-item summary {
            list-style: none;
            cursor: pointer;
            padding: 1.25rem 0;
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--heading-text);
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            transition: color var(--transition-fast);
            outline: none;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary:hover {
            color: var(--primary);
        }
        .faq-item summary .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--card-light);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-fast);
            font-size: 0.75rem;
            color: var(--primary);
        }
        .faq-item[open] summary .faq-icon {
            background: var(--primary);
            color: #fff;
            transform: rotate(45deg);
        }
        .faq-item .faq-answer {
            padding: 0 0 1.25rem 0;
            color: var(--body-text);
            line-height: 1.8;
        }

        /* 价格卡片高亮 */
        .pricing-highlight {
            position: relative;
            border: 2px solid var(--accent);
            box-shadow: var(--shadow-card-lg);
        }
        .pricing-highlight::before {
            content: '最受欢迎';
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--accent);
            color: #fff;
            font-size: 0.8rem;
            font-weight: 600;
            padding: 0.3rem 1.2rem;
            border-radius: 20px;
            letter-spacing: 0.03em;
            white-space: nowrap;
            z-index: 2;
        }

        /* 数据指标 */
        .stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.1;
        }
        @media (min-width: 768px) {
            .stat-number {
                font-size: 3rem;
            }
        }

        /* 按钮系统 */
        .btn-primary {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            padding: 0.75rem 2rem;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition-fast);
            box-shadow: 0 2px 8px rgba(11, 79, 108, 0.18);
            border: none;
            cursor: pointer;
            text-align: center;
            text-decoration: none;
            white-space: nowrap;
        }
        .btn-primary:hover {
            background: var(--primary-deeper);
            box-shadow: 0 6px 20px rgba(11, 79, 108, 0.30);
            transform: translateY(-1px);
            color: #fff;
        }
        .btn-secondary {
            display: inline-block;
            background: transparent;
            color: var(--primary);
            padding: 0.7rem 1.9rem;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition-fast);
            border: 2px solid var(--primary);
            cursor: pointer;
            text-align: center;
            text-decoration: none;
            white-space: nowrap;
        }
        .btn-secondary:hover {
            background: rgba(11, 79, 108, 0.08);
            color: var(--primary-dark);
            border-color: var(--primary-dark);
        }
        .btn-white {
            display: inline-block;
            background: #fff;
            color: var(--primary);
            padding: 0.75rem 2rem;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition-fast);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.10);
            border: none;
            cursor: pointer;
            text-align: center;
            text-decoration: none;
            white-space: nowrap;
        }
        .btn-white:hover {
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.18);
            transform: translateY(-1px);
            color: var(--primary-dark);
        }
        .btn-outline-white {
            display: inline-block;
            background: transparent;
            color: #fff;
            padding: 0.7rem 1.9rem;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition-fast);
            border: 2px solid rgba(255, 255, 255, 0.7);
            cursor: pointer;
            text-align: center;
            text-decoration: none;
            white-space: nowrap;
        }
        .btn-outline-white:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            color: #fff;
        }

        /* 图片灰度悬停 */
        .img-grayscale {
            filter: grayscale(100%);
            transition: filter var(--transition-smooth);
            opacity: 0.7;
        }
        .img-grayscale:hover {
            filter: grayscale(0%);
            opacity: 1;
        }

        /* 表单输入 */
        .form-input {
            width: 100%;
            padding: 0.85rem 1.2rem;
            border: 2px solid var(--border-light);
            border-radius: var(--radius-btn);
            font-size: 1rem;
            transition: all var(--transition-fast);
            background: #fff;
            color: var(--heading-text);
            outline: none;
        }
        .form-input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(11, 79, 108, 0.08);
        }

        /* 场景卡片 */
        .usecase-card {
            background: var(--card-light);
            border-radius: var(--radius-card);
            padding: 2rem;
            transition: all var(--transition-smooth);
            border: 1px solid transparent;
            text-align: center;
        }
        .usecase-card:hover {
            background: #fff;
            box-shadow: var(--shadow-card);
            border-color: var(--border-light);
        }
        .usecase-icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            background: linear-gradient(135deg, rgba(11, 79, 108, 0.08), rgba(11, 79, 108, 0.03));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
            font-size: 1.5rem;
            color: var(--primary);
        }

        /* 页脚链接 */
        .footer-link {
            color: var(--footer-text);
            transition: color var(--transition-fast);
            text-decoration: none;
        }
        .footer-link:hover {
            color: #fff;
        }