/* roulang page: index */
*,
        ::before,
        ::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        :root {
            --primary: #E8453C;
            --accent: #F0A500;
            --dark: #1A1A2E;
            --text-body: #3A3A4A;
            --text-muted: #6B6B78;
            --bg: #F9F9FB;
            --card-bg: #FFFFFF;
            --white: #FFFFFF;
            --border-light: #E8E8ED;
            --gradient-main: linear-gradient(135deg, #E8453C 0%, #F0A500 100%);
            --gradient-dark: linear-gradient(135deg, #E8453C 0%, #1A1A2E 100%);
            --gradient-hero-overlay: linear-gradient(225deg, rgba(232, 69, 60, 0.45) 0%, rgba(240, 165, 0, 0.1) 100%);
            --radius-card: 24px;
            --radius-btn: 8px;
            --radius-badge: 20px;
            --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.04);
            --shadow-card-hover: 0 20px 40px rgba(232, 69, 60, 0.08), 0 8px 24px rgba(26, 26, 46, 0.1);
            --transition-smooth: all 0.35s cubic-bezier(0.25, 0.8, 0.25, 1.2);
            --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --font-mono: 'SF Mono', 'DIN Alternate', 'Montserrat', 'Cascadia Code', ui-monospace, SFMono-Regular, monospace;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background-color: var(--bg);
            color: var(--text-body);
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
        }

        .container {
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* 导航栏 */
        .site-header {
            position: sticky;
            top: 0;
            background-color: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            z-index: 999;
            height: 72px;
            display: flex;
            align-items: center;
            border-bottom: 1px solid rgba(26, 26, 46, 0.05);
            transition: box-shadow 0.25s;
        }

        .site-header.scrolled {
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05);
        }

        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 1.8rem;
            letter-spacing: -0.4px;
            color: var(--dark);
        }

        .logo-icon {
            font-size: 2.2rem;
            color: var(--primary);
            display: flex;
        }

        .nav-list {
            display: flex;
            gap: 38px;
            list-style: none;
            font-weight: 500;
            color: var(--dark);
        }

        .nav-list a {
            position: relative;
            font-size: 0.98rem;
            letter-spacing: 0.2px;
            transition: color 0.25s;
            padding: 4px 0;
        }

        .nav-list a::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -3px;
            width: 0;
            height: 2.5px;
            background-color: var(--primary);
            transition: width 0.3s;
        }

        .nav-list a:hover {
            color: var(--primary);
        }

        .nav-list a:hover::after {
            width: 100%;
        }

        .nav-cta-mobile,
        .mobile-toggle {
            display: none;
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 72px;
            left: 0;
            width: 100%;
            height: calc(100vh - 72px);
            background: linear-gradient(160deg, #fff 0%, #F9F9FB 100%);
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 42px;
            z-index: 1000;
            font-size: 1.4rem;
            font-weight: 600;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s, visibility 0.3s;
        }

        .mobile-menu.open {
            opacity: 1;
            visibility: visible;
            display: flex;
        }

        .mobile-menu a {
            color: var(--dark);
            transition: color 0.2s;
        }
        .mobile-menu a:hover {
            color: var(--primary);
        }

        @media(max-width:1024px) {
            .nav-list {
                gap: 20px;
            }
        }

        @media(max-width:768px) {
            .nav-list {
                display: none;
            }
            .mobile-toggle {
                display: flex;
                align-items: center;
                background: transparent;
                border: none;
                font-size: 1.6rem;
                color: var(--dark);
                cursor: pointer;
                padding: 6px;
            }
        }

        /* 按钮全局 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            border-radius: var(--radius-btn);
            transition: var(--transition-smooth);
            cursor: pointer;
            font-size: 0.95rem;
            padding: 12px 28px;
            border: 1px solid transparent;
            letter-spacing: 0.25px;
        }

        .btn-primary {
            background: var(--gradient-main);
            color: var(--white);
            box-shadow: 0 8px 18px rgba(232, 69, 60, 0.22);
            border: none;
        }

        .btn-primary:hover {
            background: linear-gradient(135deg, #c73b33 0%, #e09000 100%);
            transform: scale(1.02);
            box-shadow: 0 14px 28px rgba(232, 69, 60, 0.34);
        }

        .btn-outline {
            background: transparent;
            border: 1.5px solid var(--primary);
            color: var(--primary);
        }

        .btn-outline:hover {
            background: var(--primary);
            color: white;
        }

        .btn-white-outline {
            background: transparent;
            border: 1.5px solid white;
            color: white;
        }
        .btn-white-outline:hover {
            background: white;
            color: var(--primary);
        }

        /* hero 区块 */
        .hero {
            padding: 70px 0 90px;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .hero-content h1 {
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.2;
            color: var(--dark);
            letter-spacing: -0.8px;
            margin-bottom: 20px;
            word-break: break-word;
        }

        .hero-content .subtitle {
            font-size: 1.15rem;
            color: var(--text-muted);
            margin-bottom: 36px;
            max-width: 85%;
            line-height: 1.6;
        }

        .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            margin-bottom: 48px;
        }

        .badge-row {
            display: flex;
            gap: 28px;
            flex-wrap: wrap;
            margin-top: 12px;
        }

        .stat-badge {
            display: flex;
            align-items: center;
            gap: 8px;
            border: 1px solid rgba(240, 165, 0, 0.5);
            background-color: rgba(240, 165, 0, 0.04);
            border-radius: 40px;
            padding: 6px 20px 6px 12px;
            font-weight: 500;
        }

        .stat-number {
            font-family: var(--font-mono);
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent);
            letter-spacing: -0.5px;
        }

        .stat-label {
            font-size: 0.9rem;
            color: var(--dark);
        }

        .hero-image-container {
            position: relative;
            border-radius: 32px;
            overflow: hidden;
            background: var(--gradient-hero-overlay);
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 28px 56px rgba(26, 26, 46, 0.12);
        }

        .hero-image-container img {
            width: 100%;
            height: auto;
            display: block;
        }

        .hero-overlay-gradient {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(225deg, rgba(232,69,60,0.3) 0%, rgba(0,0,0,0) 55%);
            pointer-events: none;
        }

        @media(max-width:1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .hero-content .subtitle {
                max-width: 100%;
            }
            .badge-row {
                justify-content: center;
            }
            .btn-group {
                justify-content: center;
            }
            .hero-content h1 {
                word-break: break-word;
            }
        }

        @media(max-width:768px) {
            .hero-content h1 {
                font-size: 2.3rem;
            }
            .hero {
                padding: 40px 0 60px;
            }
            .stat-number {
                font-size: 1.8rem;
            }
        }

        /* 板块通用标题 */
        .section-heading {
            text-align: center;
            margin-bottom: 62px;
        }

        .section-heading h2 {
            font-size: 2.4rem;
            font-weight: 750;
            color: var(--dark);
            margin-bottom: 14px;
            letter-spacing: -0.5px;
        }

        .section-heading .divider {
            width: 60px;
            height: 4px;
            background: var(--gradient-main);
            margin: 14px auto 16px;
            border-radius: 4px;
        }

        .section-desc {
            color: var(--text-muted);
            font-size: 1.1rem;
            max-width: 540px;
            margin: 0 auto;
        }

        /*亮点*/
        .highlights {
            padding: 90px 0;
            background-color: var(--card-bg);
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
        }

        .highlights-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .highlight-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            padding: 32px 24px;
            box-shadow: var(--shadow-card);
            transition: var(--transition-smooth);
            display: flex;
            flex-direction: column;
        }

        .highlight-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-card-hover);
        }

        .hl-icon {
            width: 52px;
            height: 52px;
            background: rgba(240,165,0,0.08);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 22px;
            color: var(--primary);
            font-size: 1.8rem;
        }

        .highlight-title {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 10px;
        }

        .highlight-desc {
            color: var(--text-muted);
            margin-bottom: 28px;
            flex: 1;
        }

        .highlight-metric {
            font-family: var(--font-mono);
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--accent);
        }

        @media(max-width:1024px) {
            .highlights-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media(max-width:768px) {
            .highlights-grid {
                grid-template-columns: 1fr;
            }
        }

        /* 案例 */    
        .cases {
            padding: 90px 0;
        }

        .cases-masonry {
            column-count: 3;
            column-gap: 26px;
        }

        .case-card {
            background: var(--white);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: 0 6px 20px rgba(0,0,0,0.03);
            margin-bottom: 30px;
            display: inline-block;
            width: 100%;
            transition: var(--transition-smooth);
            break-inside: avoid;
        }

        .case-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-card-hover);
        }

        .case-img {
            width: 100%;
            border-top-left-radius: var(--radius-card);
            border-top-right-radius: var(--radius-card);
        }

        .case-body {
            padding: 22px 20px 20px;
        }

        .case-tag {
            display: inline-block;
            background: rgba(232,69,60,0.13);
            color: var(--primary);
            font-size: 0.8rem;
            font-weight: 700;
            padding: 4px 14px;
            border-radius: 40px;
            margin-bottom: 14px;
        }

        .case-body h3 {
            font-size: 1.2rem;
            margin-bottom: 8px;
            color: var(--dark);
        }

        @media(max-width:1024px) {
            .cases-masonry {
                column-count: 2;
            }
        }
        @media(max-width:768px) {
            .cases-masonry {
                column-count: 1;
            }
        }

        /*对比*/
        .compare {
            padding: 90px 0;
            background: var(--bg);
        }

        .compare-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            align-items: start;
        }

        .plan-card {
            background: white;
            border-radius: var(--radius-card);
            padding: 36px 28px;
            box-shadow: 0 8px 28px rgba(0,0,0,0.03);
            transition: var(--transition-smooth);
            border: 1px solid transparent;
        }

        .plan-card.popular {
            background: var(--gradient-main);
            color: white;
            box-shadow: 0 24px 44px rgba(232,69,60,0.24);
        }

        .plan-card h3 {
            font-size: 1.6rem;
            margin-bottom: 28px;
        }

        .plan-feature {
            display: flex;
            align-items: center;
            margin: 14px 0;
            gap: 10px;
        }
        .popular h3, .popular .plan-feature {
            color: white;
        }

        @media(max-width:1024px) {
            .compare-grid {
                grid-template-columns: 1fr;
                max-width: 480px;
                margin: 0 auto;
            }
        }

        /* FAQ */    
        .faq {
            padding: 90px 0;
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: white;
            border-radius: 16px;
            margin-bottom: 20px;
            box-shadow: 0 6px 18px rgba(0,0,0,0.03);
        }

        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 22px 26px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 700;
            cursor: pointer;
            color: var(--dark);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.45s ease;
            padding: 0 26px;
        }
        .faq-item.active .faq-answer {
            padding: 0 26px 22px;
            max-height: 220px;
        }

        @media(max-width:768px) {
            .faq-question { 
                font-size: 0.98rem;
            }
        }

        /* CTA */    
        .cta-block {
            margin: 50px 0 80px;
        }
        .cta-card {
            background: linear-gradient(125deg, #E8453C 0%, #1A1A2E 100%);
            border-radius: 36px;
            padding: 74px 24px;
            text-align: center;
            color: white;
        }

        .footer {
            background: var(--dark);
            color: #b0b0c0;
            padding: 60px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.2fr 1.2fr;
            gap: 36px;
        }

        @media(max-width:768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }

        .footer a:hover toxicity {
            color: var(--accent);
        }