/* roulang page: index */
:root {
            --bs-primary: #F15A24;
            --bs-primary-rgb: 241, 90, 36;
            --bs-body-color: #555555;
            --bs-border-radius: 8px;
            --bs-border-radius-lg: 12px;
            --bs-border-radius-xl: 16px;
            --bs-border-radius-2xl: 40px;
            --color-orange: #F15A24;
            --color-dark: #1E1E1E;
            --color-warm-bg: #FAFAF7;
            --color-card: #FFFFFF;
            --color-sky: #00A8CC;
            --color-gray: #555555;
            --color-light-gray: #888888;
            --color-border: #DDDDDD;
            --color-footer-bg: #1E1E1E;
            --color-footer-text: #BBBBBB;
            --shadow-card: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.03);
            --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
            --font-stack: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --spacing-section: 100px;
        }

        * {
            box-sizing: border-box;
        }

        body {
            font-family: var(--font-stack);
            background-color: var(--color-warm-bg);
            color: var(--color-gray);
            line-height: 1.6;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--color-dark);
            font-weight: 600;
            letter-spacing: -0.2px;
            margin-bottom: 0.75rem;
        }

        p {
            margin-bottom: 1rem;
            font-size: 15px;
            line-height: 24px;
        }

        a {
            text-decoration: none;
            color: var(--color-dark);
            transition: color 0.2s ease;
        }

        a:hover {
            color: var(--color-orange);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--bs-border-radius-lg);
        }

        button, .btn {
            font-weight: 500;
            letter-spacing: 0.3px;
            transition: all 0.25s ease;
            border-radius: 8px;
            padding: 0.6rem 1.8rem;
            font-size: 15px;
            text-transform: none;
        }

        .container-custom {
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        /* 浮动导航 Dock */
        .navigation-dock {
            position: fixed;
            top: 16px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 1050;
            width: 90%;
            max-width: 720px;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-radius: 40px;
            padding: 8px 16px;
            box-shadow: var(--shadow-card);
            display: flex;
            align-items: center;
            justify-content: space-between;
            border: 1px solid rgba(255,255,255,0.4);
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 6px;
            font-weight: 700;
            font-size: 18px;
            color: var(--color-dark);
            white-space: nowrap;
        }

        .nav-logo svg {
            width: 24px;
            height: 24px;
            fill: var(--color-orange);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 5px;
            list-style: none;
            margin: 0;
            padding: 0;
            flex-wrap: wrap;
            justify-content: center;
        }

        .nav-links li a {
            padding: 8px 12px;
            border-radius: 24px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-dark);
            transition: all 0.2s;
            white-space: nowrap;
        }

        .nav-links li a:hover, .nav-links li a.active {
            color: var(--color-orange);
            background: rgba(241,90,36,0.08);
        }

        .nav-cta-btn {
            background: var(--color-orange);
            color: white;
            border: none;
            border-radius: 36px;
            padding: 6px 18px;
            height: 36px;
            font-size: 14px;
            font-weight: 600;
            display: flex;
            align-items: center;
            white-space: nowrap;
            transition: all 0.25s;
        }

        .nav-cta-btn:hover {
            background: #e14a1a;
            color: white;
            box-shadow: 0 6px 20px rgba(241,90,36,0.3);
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--color-dark);
            padding: 4px;
        }

        /* Hero 双栏 */
        .hero-section {
            padding: 160px 0 120px;
            display: flex;
            align-items: center;
            gap: 48px;
        }

        .hero-left {
            flex: 0 0 55%;
        }

        .hero-right {
            flex: 0 0 45%;
            position: relative;
            height: 380px;
            border-radius: 16px;
            overflow: hidden;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            box-shadow: var(--shadow-card);
        }

        .hero-right::after {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 80px;
            height: 80px;
            background: rgba(241,90,36,0.18);
            clip-path: polygon(100% 0, 0 0, 100% 100%);
        }

        .hero-right .gradient-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(30,30,30,0.1) 0%, rgba(30,30,30,0) 100%);
        }

        .hero-title {
            font-size: 40px;
            line-height: 1.2;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .hero-title span {
            color: var(--color-orange);
        }

        .hero-subtitle {
            font-size: 18px;
            color: var(--color-gray);
            margin-bottom: 28px;
            max-width: 480px;
            line-height: 1.5;
        }

        .hero-stats {
            display: flex;
            gap: 32px;
            margin-top: 32px;
            flex-wrap: wrap;
        }

        .stat-item h3 {
            font-size: 28px;
            color: var(--color-sky);
            font-weight: 700;
            margin-bottom: 0;
        }

        .stat-item p {
            font-size: 12px;
            color: var(--color-light-gray);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin: 0;
        }

        .btn-primary-custom {
            background: var(--color-orange);
            border-color: var(--color-orange);
            color: white;
            border-radius: 8px;
            padding: 0.7rem 2rem;
        }

        .btn-primary-custom:hover {
            background: #e8551e;
            border-color: #e8551e;
            box-shadow: 0 6px 20px rgba(241,90,36,0.3);
            transform: translateY(-1px);
        }

        .btn-outline-custom {
            border: 1px solid var(--color-dark);
            color: var(--color-dark);
            background: transparent;
            border-radius: 8px;
            padding: 0.7rem 2rem;
        }

        .btn-outline-custom:hover {
            background: var(--color-dark);
            color: white;
            border-color: var(--color-dark);
        }

        /* 板块间距 */
        .section-padding {
            padding: 80px 0;
        }

        .section-title {
            font-size: 28px;
            margin-bottom: 12px;
            font-weight: 600;
        }

        .section-desc {
            color: var(--color-light-gray);
            max-width: 600px;
            margin-bottom: 48px;
        }

        /* 卡片统一样式 */
        .feature-card {
            background: var(--color-card);
            border-radius: 12px;
            padding: 32px 24px;
            box-shadow: var(--shadow-card);
            transition: all 0.25s;
            height: 100%;
            border: none;
        }

        .feature-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        .feature-icon {
            font-size: 36px;
            color: var(--color-orange);
            margin-bottom: 16px;
        }

        /* 案例瀑布流 */
        .cases-masonry {
            column-count: 3;
            column-gap: 20px;
        }

        .case-card {
            break-inside: avoid;
            margin-bottom: 20px;
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all 0.25s;
        }

        .case-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        .case-card img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.3s;
            border-radius: 12px 12px 0 0;
        }

        .case-card:hover img {
            transform: scale(1.03);
        }

        .case-info {
            padding: 16px;
        }

        .case-tag {
            font-size: 12px;
            color: var(--color-light-gray);
        }

        /* 方案对比卡 */
        .pricing-card {
            background: white;
            border-radius: 16px;
            padding: 32px 24px;
            box-shadow: var(--shadow-card);
            position: relative;
            height: 100%;
            border: 1px solid transparent;
        }

        .pricing-card.popular {
            border: 2px solid var(--color-orange);
        }

        .popular-badge {
            position: absolute;
            top: 16px;
            right: 16px;
            background: var(--color-orange);
            color: white;
            font-size: 12px;
            padding: 4px 12px;
            border-radius: 4px;
        }

        .pricing-feature {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
            font-size: 14px;
        }

        /* FAQ */
        .accordion-button {
            font-weight: 500;
            font-size: 16px;
            color: var(--color-dark);
            background: transparent;
            box-shadow: none;
            border: none;
            padding: 16px 0;
        }

        .accordion-button:not(.collapsed) {
            color: var(--color-orange);
            background: transparent;
        }

        .accordion-button::after {
            background-image: none;
            content: '+';
            font-size: 24px;
            color: var(--color-orange);
            font-weight: 400;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .accordion-button:not(.collapsed)::after {
            content: '×';
        }

        .accordion-item {
            border: none;
            border-bottom: 1px solid #EEEEEE;
            background: transparent;
        }

        /* 联系表单 */
        .contact-form-bg {
            background: #F5F5F2;
            border-radius: 12px;
            padding: 32px;
        }

        .form-control {
            border-radius: 6px;
            border: 1px solid #DDD;
            padding: 0.6rem 1rem;
            font-size: 15px;
        }

        .form-control:focus {
            border-color: var(--color-orange);
            box-shadow: 0 0 0 3px rgba(241,90,36,0.1);
        }

        /* 页脚 */
        .footer {
            background: var(--color-footer-bg);
            color: var(--color-footer-text);
            padding: 60px 0 30px;
        }

        .footer a {
            color: #BBBBBB;
            font-size: 14px;
        }

        .footer a:hover {
            color: white;
        }

        @media (max-width: 992px) {
            .hero-section {
                flex-direction: column;
                gap: 32px;
                padding-top: 140px;
                text-align: center;
            }
            .hero-left, .hero-right {
                flex: 1 1 auto;
                width: 100%;
            }
            .hero-right {
                height: 280px;
            }
            .cases-masonry {
                column-count: 2;
            }
            .nav-links {
                display: none;
            }
            .mobile-menu-toggle {
                display: block;
            }
        }

        @media (max-width: 768px) {
            .cases-masonry {
                column-count: 1;
            }
            .navigation-dock {
                width: 95%;
            }
            .hero-title {
                font-size: 32px;
            }
        }

        @media (max-width: 576px) {
            .hero-stats {
                justify-content: center;
                gap: 20px;
            }
            .section-padding {
                padding: 60px 0;
            }
            .hero-title {
                font-size: 28px;
            }
        }

        .btn-close-mobile {
            display: none;
        }