/* roulang page: index */
:root {
            --color-brand-blue: #2563EB;
            --color-brand-blue-hover: #1D4ED8;
            --color-brand-orange: #FF6B35;
            --color-brand-orange-hover: #E55A2B;
            --color-bg-light: #F1F5F9;
            --color-bg-white: #FFFFFF;
            --color-text-primary: #0F172A;
            --color-text-secondary: #1E293B;
            --color-text-body: #475569;
            --color-text-muted: #94A3B8;
            --color-text-tag: #64748B;
            --color-border-light: #E2E8F0;
            --font-stack: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            --nav-height-desktop: 72px;
            --nav-height-mobile: 60px;
            --container-max: 1200px;
            --transition-fast: 0.2s ease;
            --transition-normal: 0.25s ease;
            --transition-slow: 0.35s ease;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height-desktop);
        }

        body {
            font-family: var(--font-stack);
            line-height: 1.65;
            color: var(--color-text-body);
            background-color: var(--color-bg-white);
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--color-brand-blue);
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-brand-blue-hover);
        }

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

        button {
            font-family: var(--font-stack);
            cursor: pointer;
            border: none;
            outline: none;
        }
        button:focus-visible,
        a:focus-visible {
            outline: 2px solid var(--color-brand-blue);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .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: 2.5rem;
                padding-right: 2.5rem;
            }
        }

        /* 导航 */
        .site-nav {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--color-bg-white);
            height: var(--nav-height-mobile);
            transition: box-shadow var(--transition-normal);
            display: flex;
            align-items: center;
        }
        .site-nav.scrolled {
            box-shadow: 0 1px 0 #E2E8F0, 0 2px 8px rgba(0, 0, 0, 0.06);
        }
        @media (min-width: 1024px) {
            .site-nav {
                height: var(--nav-height-desktop);
            }
        }
        .site-nav .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        @media (min-width: 640px) {
            .site-nav .nav-inner {
                padding: 0 2rem;
            }
        }
        @media (min-width: 1024px) {
            .site-nav .nav-inner {
                padding: 0 2.5rem;
            }
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--color-text-primary);
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-logo:hover {
            color: var(--color-brand-blue);
        }
        .nav-logo .logo-icon {
            width: 28px;
            height: 28px;
            flex-shrink: 0;
        }

        .nav-links-desktop {
            display: none;
            align-items: center;
            gap: 6px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        @media (min-width: 1024px) {
            .nav-links-desktop {
                display: flex;
            }
        }
        .nav-links-desktop li a {
            display: inline-block;
            padding: 8px 18px;
            border-radius: 20px;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--color-text-body);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .nav-links-desktop li a:hover {
            background-color: #EBF2FF;
            color: var(--color-brand-blue);
        }
        .nav-links-desktop li a.nav-active {
            background-color: rgba(37, 99, 235, 0.12);
            color: var(--color-brand-blue);
            font-weight: 600;
        }

        .nav-cta-desktop {
            display: none;
            padding: 10px 22px;
            border-radius: 8px;
            background-color: var(--color-brand-orange);
            color: #fff;
            font-weight: 600;
            font-size: 0.875rem;
            white-space: nowrap;
            transition: background-color var(--transition-fast), transform var(--transition-fast);
        }
        .nav-cta-desktop:hover {
            background-color: var(--color-brand-orange-hover);
            color: #fff;
            transform: scale(1.03);
        }
        @media (min-width: 1024px) {
            .nav-cta-desktop {
                display: inline-block;
            }
        }

        /* 汉堡菜单按钮 */
        .hamburger-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 0;
            flex-direction: column;
            gap: 5px;
            z-index: 1100;
        }
        @media (min-width: 1024px) {
            .hamburger-btn {
                display: none;
            }
        }
        .hamburger-btn span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-text-primary);
            border-radius: 2px;
            transition: all var(--transition-normal);
        }
        .hamburger-btn.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger-btn.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger-btn.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* 移动端导航面板 */
        .mobile-nav-panel {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background: #fff;
            z-index: 1050;
            transform: translateY(-100%);
            transition: transform var(--transition-slow);
            display: flex;
            flex-direction: column;
            padding-top: 80px;
            overflow-y: auto;
        }
        .mobile-nav-panel.open {
            transform: translateY(0);
        }
        .mobile-nav-panel a {
            display: block;
            padding: 16px 24px;
            font-size: 1rem;
            font-weight: 500;
            color: var(--color-text-primary);
            border-bottom: 1px solid #f1f5f9;
            transition: all var(--transition-fast);
            text-decoration: none;
        }
        .mobile-nav-panel a:hover {
            background-color: #EBF2FF;
            color: var(--color-brand-blue);
        }
        .mobile-nav-panel .mobile-cta {
            margin: 24px auto 0;
            display: block;
            width: 80%;
            text-align: center;
            padding: 14px 28px;
            border-radius: 8px;
            background-color: var(--color-brand-orange);
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            transition: background-color var(--transition-fast);
            text-decoration: none;
        }
        .mobile-nav-panel .mobile-cta:hover {
            background-color: var(--color-brand-orange-hover);
            color: #fff;
        }

        /* Hero */
        .hero-section {
            min-height: auto;
            padding: 60px 0 40px;
        }
        @media (min-width: 1024px) {
            .hero-section {
                min-height: 70vh;
                padding: 80px 0 60px;
                display: flex;
                align-items: center;
            }
        }
        .hero-grid {
            display: flex;
            flex-direction: column;
            gap: 40px;
        }
        @media (min-width: 1024px) {
            .hero-grid {
                flex-direction: row;
                gap: 60px;
                align-items: center;
            }
            .hero-left {
                flex: 0 0 55%;
            }
            .hero-right {
                flex: 0 0 45%;
                position: relative;
            }
        }
        .hero-img-wrapper {
            position: relative;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }
        .hero-img-wrapper img {
            width: 100%;
            height: auto;
            min-height: 280px;
            object-fit: cover;
            border-radius: 12px;
        }
        @media (min-width: 1024px) {
            .hero-img-wrapper img {
                min-height: 420px;
            }
        }
        .hero-data-card {
            position: absolute;
            bottom: 16px;
            left: 16px;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-radius: 10px;
            padding: 14px 18px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
            font-size: 0.8rem;
            color: var(--color-text-secondary);
            font-weight: 600;
            z-index: 2;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .hero-data-card .pulse-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background-color: #10B981;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.5);
            }
            50% {
                box-shadow: 0 0 0 10px rgba(16, 185, 129, 0);
            }
        }
        .hero-bg-grid {
            position: absolute;
            inset: 0;
            pointer-events: none;
            z-index: 1;
            opacity: 0.06;
            background-image:
                linear-gradient(rgba(37, 99, 235, 0.5) 1px, transparent 1px),
                linear-gradient(90deg, rgba(37, 99, 235, 0.5) 1px, transparent 1px);
            background-size: 28px 28px;
            border-radius: 12px;
        }

        /* 亮点卡片 */
        .highlight-card {
            background: #fff;
            border-radius: 10px;
            padding: 28px 24px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
            transition: box-shadow var(--transition-normal), transform var(--transition-normal);
            text-align: center;
        }
        .highlight-card:hover {
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.10);
            transform: translateY(-4px);
        }
        .highlight-card .hl-number {
            font-size: 2.25rem;
            font-weight: 800;
            line-height: 1.1;
            letter-spacing: -0.01em;
            font-variant-numeric: tabular-nums;
            margin-bottom: 8px;
        }
        .highlight-card .hl-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--color-text-secondary);
            margin-bottom: 6px;
        }
        .highlight-card .hl-desc {
            font-size: 0.8125rem;
            color: var(--color-text-muted);
            line-height: 1.5;
        }

        /* 案例瀑布流 */
        .case-masonry {
            column-count: 1;
            column-gap: 20px;
        }
        @media (min-width: 768px) {
            .case-masonry {
                column-count: 2;
            }
        }
        @media (min-width: 1024px) {
            .case-masonry {
                column-count: 3;
                column-gap: 24px;
            }
        }
        .case-card {
            break-inside: avoid;
            margin-bottom: 20px;
            background: #fff;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            transition: box-shadow var(--transition-slow), transform var(--transition-slow);
        }
        @media (min-width: 1024px) {
            .case-card {
                margin-bottom: 24px;
            }
        }
        .case-card:hover {
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
        }
        .case-card:hover .case-cover-img {
            transform: scale(1.03);
        }
        .case-card .case-img-wrap {
            overflow: hidden;
            position: relative;
        }
        .case-card .case-cover-img {
            width: 100%;
            display: block;
            object-fit: cover;
            transition: transform 0.3s ease;
        }
        .case-card .case-body {
            padding: 18px;
        }
        .case-card .case-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--color-text-secondary);
            margin-bottom: 6px;
            line-height: 1.35;
        }
        .case-card .case-summary {
            font-size: 0.875rem;
            color: var(--color-text-muted);
            line-height: 1.5;
            margin-bottom: 10px;
        }
        .case-card .case-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }
        .case-tag {
            display: inline-block;
            padding: 3px 10px;
            border-radius: 4px;
            background: #F1F5F9;
            font-size: 0.75rem;
            color: #64748B;
            white-space: nowrap;
        }

        /* 方案对比 */
        .solution-compare {
            background-color: #F1F5F9;
            border-radius: 0;
        }
        .solution-col {
            background: #fff;
            border-radius: 10px;
            padding: 32px 28px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        }
        .solution-col h3 {
            text-align: center;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-text-secondary);
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 14px;
        }
        .solution-col h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 3px;
            background: var(--color-brand-blue);
            border-radius: 2px;
        }
        .solution-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .solution-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.9375rem;
            color: var(--color-text-body);
            line-height: 1.5;
        }
        .solution-list li .check-icon {
            flex-shrink: 0;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--color-brand-blue);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-top: 2px;
        }
        .solution-list li .check-icon svg {
            width: 11px;
            height: 11px;
        }
        .solution-divider-desktop {
            display: none;
        }
        @media (min-width: 1024px) {
            .solution-divider-desktop {
                display: block;
                width: 1px;
                background: #E2E8F0;
                align-self: stretch;
                flex-shrink: 0;
            }
        }
        .solution-divider-mobile {
            width: 100%;
            border-top: 2px dashed #E2E8F0;
            margin: 0;
        }
        @media (min-width: 1024px) {
            .solution-divider-mobile {
                display: none;
            }
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid #E2E8F0;
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-question {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 16px 0;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            color: var(--color-text-secondary);
            user-select: none;
            transition: color var(--transition-fast);
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
            font-family: var(--font-stack);
        }
        .faq-question:hover {
            color: var(--color-brand-blue);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            border: 2px solid var(--color-brand-blue);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-normal);
            position: relative;
        }
        .faq-icon::before,
        .faq-icon::after {
            content: '';
            position: absolute;
            background: var(--color-brand-blue);
            transition: transform var(--transition-normal);
        }
        .faq-icon::before {
            width: 8px;
            height: 2px;
            border-radius: 1px;
        }
        .faq-icon::after {
            width: 2px;
            height: 8px;
            border-radius: 1px;
        }
        .faq-item.open .faq-icon::after {
            transform: rotate(90deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow);
            padding-left: 30px;
            font-size: 0.875rem;
            color: var(--color-text-body);
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding-bottom: 16px;
        }

        /* CTA区块 */
        .cta-block {
            background: linear-gradient(180deg, #FFFFFF 0%, #EBF2FF 100%);
            padding: 80px 0;
            text-align: center;
        }
        @media (max-width: 767px) {
            .cta-block {
                padding: 60px 0;
            }
        }

        /* 页脚 */
        .site-footer a {
            color: #64748B;
            transition: color var(--transition-fast);
            font-size: 0.8125rem;
        }
        .site-footer a:hover {
            color: var(--color-brand-blue);
        }
        .footer-social-placeholder {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: #E2E8F0;
            color: #94A3B8;
            font-size: 0.875rem;
            transition: background var(--transition-fast), color var(--transition-fast);
        }
        .footer-social-placeholder:hover {
            background: #CBD5E1;
            color: #64748B;
        }

        /* 区块间距 */
        .section-gap-lg {
            padding-top: 80px;
            padding-bottom: 80px;
        }
        .section-gap-md {
            padding-top: 60px;
            padding-bottom: 60px;
        }
        @media (max-width: 767px) {
            .section-gap-lg {
                padding-top: 50px;
                padding-bottom: 50px;
            }
            .section-gap-md {
                padding-top: 40px;
                padding-bottom: 40px;
            }
        }

        @media (max-width: 767px) {
            html {
                scroll-padding-top: var(--nav-height-mobile);
            }
            .highlight-card .hl-number {
                font-size: 1.8rem;
            }
            .hero-data-card {
                font-size: 0.7rem;
                padding: 10px 14px;
                bottom: 10px;
                left: 10px;
            }
        }

@media (min-width: 640px) {
                    #highlights .container-custom>div:last-child {
                        grid-template-columns: repeat(2, 1fr);
                    }
                }
                @media (min-width: 1024px) {
                    #highlights .container-custom>div:last-child {
                        grid-template-columns: repeat(4, 1fr);
                        gap: 24px;
                    }
                }

@media (min-width: 1024px) {
                            #solutions .container-custom>div:last-child {
                                flex-direction: row !important;
                                gap: 0 !important;
                                align-items: stretch;
                            }
                        }

@media (min-width: 640px) {
                        .site-footer .container-custom>div:first-child {
                            grid-template-columns: repeat(2, 1fr);
                        }
                    }
                    @media (min-width: 1024px) {
                        .site-footer .container-custom>div:first-child {
                            grid-template-columns: repeat(4, 1fr);
                            gap: 40px;
                        }
                    }