/* roulang page: index */
:root {
            --primary: #0F766E;
            --primary-dark: #115E59;
            --primary-light: #CCFBF1;
            --accent: #F97316;
            --accent-hover: #EA580C;
            --dark: #0F172A;
            --dark-surface: #1E293B;
            --text-main: #0F172A;
            --text-muted: #475569;
            --bg-light: #F8FAFC;
            --bg-white: #FFFFFF;
            --border-color: #E2E8F0;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
            --radius-md: 10px;
            --radius-lg: 16px;
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--bg-white);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        ul, ol {
            list-style: none;
        }

        .container {
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 顶部通栏工具条 */
        .top-bar {
            background-color: var(--dark);
            color: #94A3B8;
            font-size: 0.8125rem;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .top-bar-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .top-bar-links a {
            color: #CBD5E1;
            margin-left: 20px;
        }
        .top-bar-links a:hover {
            color: #FFFFFF;
        }

        /* 导航头 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.02em;
        }
        .brand-logo svg {
            width: 32px;
            height: 32px;
            fill: var(--primary);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 28px;
        }
        .nav-link {
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-muted);
            padding: 8px 0;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        /* 按钮系统 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 10px 22px;
            border-radius: var(--radius-md);
            cursor: pointer;
            border: 1px solid transparent;
            transition: var(--transition);
            text-align: center;
        }
        .btn-primary {
            background-color: var(--primary);
            color: #FFFFFF;
        }
        .btn-primary:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(15, 118, 110, 0.25);
        }
        .btn-accent {
            background-color: var(--accent);
            color: #FFFFFF;
        }
        .btn-accent:hover {
            background-color: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
        }
        .btn-outline {
            background-color: transparent;
            border-color: var(--border-color);
            color: var(--text-main);
        }
        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background-color: var(--primary-light);
        }
        .btn-lg {
            padding: 14px 32px;
            font-size: 1.05rem;
            border-radius: var(--radius-lg);
        }

        /* 板块公用 */
        .section-padding {
            padding: 80px 0;
        }
        .section-header {
            margin-bottom: 48px;
        }
        .section-header.text-center {
            text-align: center;
            max-width: 760px;
            margin-left: auto;
            margin-right: auto;
        }
        .section-tag {
            display: inline-block;
            font-size: 0.8125rem;
            font-weight: 700;
            color: var(--primary);
            background-color: var(--primary-light);
            padding: 4px 12px;
            border-radius: 9999px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 12px;
        }
        .section-title {
            font-size: 2.15rem;
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-main);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* 1. 斜切首屏 (Hero) */
        .hero-section {
            position: relative;
            background: linear-gradient(135deg, #092C28 0%, #0F766E 50%, #115E59 100%);
            color: #FFFFFF;
            padding: 100px 0 140px;
            clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
            overflow: hidden;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('/assets/images/c9cf0b8fcf913cec.jpg') center/cover no-repeat;
            opacity: 0.12;
            pointer-events: none;
        }
        .hero-grid {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            gap: 40px;
            align-items: center;
        }
        .hero-content h1 {
            font-size: 3.1rem;
            font-weight: 900;
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -0.03em;
        }
        .hero-content h1 span {
            color: #FED7AA;
        }
        .hero-desc {
            font-size: 1.125rem;
            color: #E2E8F0;
            line-height: 1.75;
            margin-bottom: 32px;
        }
        .hero-preview-card {
            background: rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(16px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
        }
        .preview-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid rgba(255,255,255,0.15);
            padding-bottom: 14px;
            margin-bottom: 16px;
        }
        .status-badge {
            font-size: 0.75rem;
            background: #22C55E;
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-weight: 600;
        }
        .preview-stats-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px;
            margin-bottom: 16px;
        }
        .stat-box {
            background: rgba(15, 23, 42, 0.4);
            padding: 14px;
            border-radius: var(--radius-md);
        }
        .stat-box .num {
            font-size: 1.4rem;
            font-weight: 800;
            color: #38BDF8;
        }
        .stat-box .lbl {
            font-size: 0.8rem;
            color: #94A3B8;
        }

        /* 2. 运营痛点透视区 */
        .pain-points-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .pain-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            position: relative;
            transition: var(--transition);
        }
        .pain-card:hover {
            border-color: #CBD5E1;
            box-shadow: var(--shadow-xl);
            transform: translateY(-4px);
        }
        .pain-tag {
            color: #EF4444;
            background: #FEE2E2;
            font-size: 0.8rem;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 4px;
            display: inline-block;
            margin-bottom: 16px;
        }
        .pain-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .pain-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 20px;
        }
        .pain-solution-box {
            background: var(--bg-light);
            border-left: 3px solid var(--primary);
            padding: 12px;
            font-size: 0.875rem;
            color: var(--primary-dark);
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            font-weight: 500;
        }

        /* 3. 架构与认证 */
        .arch-section {
            background-color: var(--bg-light);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .arch-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .arch-matrix-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
            margin-top: 24px;
        }
        .arch-item {
            display: flex;
            gap: 16px;
            background: #FFFFFF;
            padding: 16px 20px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
        }
        .arch-icon {
            width: 44px;
            height: 44px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            flex-shrink: 0;
            font-weight: 800;
            font-size: 1.1rem;
        }
        .arch-text h4 {
            font-size: 1.05rem;
            margin-bottom: 4px;
        }
        .arch-text p {
            font-size: 0.875rem;
            color: var(--text-muted);
        }

        /* 4. 核心优势 6卡片网格 */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-box {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            transition: var(--transition);
        }
        .feature-box:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-xl);
            transform: translateY(-4px);
        }
        .feature-icon-circle {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            background: #F0FDFA;
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.35rem;
            font-weight: bold;
            margin-bottom: 20px;
            border: 1px solid #CCFBF1;
        }
        .feature-box h3 {
            font-size: 1.25rem;
            margin-bottom: 12px;
            font-weight: 700;
        }
        .feature-box p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.65;
        }

        /* 5. 热门解决方案 3卡片 */
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .solution-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            box-shadow: var(--shadow-sm);
        }
        .solution-img-wrap {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .solution-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .solution-card:hover .solution-img-wrap img {
            transform: scale(1.05);
        }
        .solution-content {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .solution-content h3 {
            font-size: 1.25rem;
            margin-bottom: 10px;
        }
        .solution-content p {
            color: var(--text-muted);
            font-size: 0.925rem;
            margin-bottom: 20px;
            flex: 1;
        }
        .solution-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .solution-tag-item {
            font-size: 0.75rem;
            background: var(--bg-light);
            color: var(--text-muted);
            padding: 4px 8px;
            border-radius: 4px;
            border: 1px solid var(--border-color);
        }

        /* 6. 深色 IoT 硬件生态联动 */
        .iot-section {
            background-color: var(--dark);
            color: #FFFFFF;
            position: relative;
            overflow: hidden;
        }
        .iot-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/bd7c0fa155b283ec.jpg') center/cover no-repeat;
            opacity: 0.08;
        }
        .iot-grid {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 40px;
        }
        .iot-card {
            background: var(--dark-surface);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
        }
        .iot-card h4 {
            font-size: 1.15rem;
            margin: 16px 0 8px;
            color: #38BDF8;
        }
        .iot-card p {
            color: #94A3B8;
            font-size: 0.875rem;
            line-height: 1.6;
        }

        /* 7. 实施方法与步骤 */
        .steps-wrapper {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 16px;
            position: relative;
        }
        .step-item {
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px 16px;
            text-align: center;
            position: relative;
        }
        .step-num {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary);
            color: #FFFFFF;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .step-item h4 {
            font-size: 1.05rem;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.8125rem;
            color: var(--text-muted);
        }

        /* 8. 关键业务指标 */
        .metrics-banner {
            background: linear-gradient(90deg, #115E59 0%, #0F766E 100%);
            color: #FFFFFF;
            padding: 48px 0;
        }
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .metric-item .val {
            font-size: 2.8rem;
            font-weight: 900;
            letter-spacing: -0.02em;
            color: #FED7AA;
            margin-bottom: 4px;
        }
        .metric-item .label {
            font-size: 1rem;
            color: #E2E8F0;
            font-weight: 500;
        }

        /* 9. 客户评价与口碑 */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .testi-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 28px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .testi-text {
            font-size: 0.95rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 24px;
            font-style: italic;
        }
        .testi-author {
            display: flex;
            align-items: center;
            gap: 14px;
            border-top: 1px solid var(--border-color);
            padding-top: 16px;
        }
        .avatar-circle {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }
        .author-info h5 {
            font-size: 0.95rem;
            font-weight: 700;
        }
        .author-info span {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* 10. 资讯精选 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .news-card {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: #FFFFFF;
        }
        .news-card-img {
            height: 180px;
            overflow: hidden;
        }
        .news-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .news-card-body {
            padding: 20px;
        }
        .news-date {
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-bottom: 8px;
        }
        .news-card-body h4 {
            font-size: 1.1rem;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .news-card-body p {
            font-size: 0.875rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 11. FAQ 手风琴 */
        .faq-list {
            max-width: 880px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            background: #FFFFFF;
        }
        .faq-question {
            padding: 20px 24px;
            font-size: 1.05rem;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            user-select: none;
            background: #FFFFFF;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-icon {
            font-size: 1.25rem;
            transition: transform 0.2s ease;
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            background: var(--bg-light);
            border-top: 1px solid transparent;
        }
        .faq-item.active .faq-answer {
            border-top-color: var(--border-color);
        }
        .faq-answer-inner {
            padding: 20px 24px;
            font-size: 0.95rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* 12. 转化收口区 */
        .cta-box-wrapper {
            background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
            border-radius: var(--radius-lg);
            padding: 60px 40px;
            color: #FFFFFF;
            text-align: center;
            box-shadow: var(--shadow-xl);
            position: relative;
            overflow: hidden;
        }
        .cta-box-wrapper h2 {
            font-size: 2.25rem;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .cta-box-wrapper p {
            color: #94A3B8;
            font-size: 1.05rem;
            max-width: 680px;
            margin: 0 auto 32px;
        }
        .cta-form {
            display: flex;
            gap: 12px;
            max-width: 520px;
            margin: 0 auto;
        }
        .cta-form input {
            flex: 1;
            padding: 14px 18px;
            border-radius: var(--radius-md);
            border: 1px solid rgba(255,255,255,0.2);
            background: rgba(255,255,255,0.05);
            color: #FFFFFF;
            font-size: 0.95rem;
            outline: none;
        }
        .cta-form input:focus {
            border-color: var(--accent);
        }

        /* 页脚 */
        .site-footer {
            background-color: #0B1120;
            color: #94A3B8;
            padding: 64px 0 32px;
            border-top: 1px solid rgba(255,255,255,0.05);
            font-size: 0.9rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 48px;
        }
        .footer-brand h4 {
            color: #FFFFFF;
            font-size: 1.3rem;
            margin-bottom: 16px;
            font-weight: 800;
        }
        .footer-brand p {
            line-height: 1.7;
            margin-bottom: 20px;
        }
        .footer-col h5 {
            color: #FFFFFF;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 20px;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-col a:hover {
            color: #FFFFFF;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.8125rem;
        }

        /* 移动端菜单抽屉 */
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
        }
        .mobile-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background-color: var(--text-main);
            margin: 5px 0;
            transition: var(--transition);
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
            }
            .pain-points-grid,
            .features-grid,
            .solutions-grid,
            .testimonials-grid,
            .news-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .iot-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-wrapper {
                grid-template-columns: repeat(3, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .top-bar {
                display: none;
            }
            .nav-menu {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                background: #FFFFFF;
                flex-direction: column;
                padding: 24px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-xl);
                gap: 16px;
            }
            .nav-menu.show {
                display: flex;
            }
            .mobile-toggle {
                display: block;
            }
            .nav-actions {
                display: none;
            }
            .hero-content h1 {
                font-size: 2.2rem;
            }
            .hero-section {
                padding: 60px 0 100px;
                clip-path: polygon(0 0, 100% 0, 100% 96%, 0 100%);
            }
            .pain-points-grid,
            .features-grid,
            .solutions-grid,
            .testimonials-grid,
            .news-grid,
            .iot-grid,
            .steps-wrapper,
            .arch-grid,
            .metrics-grid {
                grid-template-columns: 1fr;
            }
            .cta-form {
                flex-direction: column;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 12px;
                text-align: center;
            }
        }