/* roulang page: index */
:root {
            --brand-orange: #FF4F1E;
            --brand-orange-deep: #E04418;
            --brand-ink: #0F172A;
            --soft-bg: #F1F5F9;
            --white: #FFFFFF;
            --text-secondary: #475569;
            --border-light: #E2E8F0;
            --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
            --radius-card: 12px;
            --radius-btn: 8px;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
            --transition-base: 0.25s ease;
        }

        * {
            box-sizing: border-box;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--soft-bg);
            color: var(--brand-ink);
            line-height: 1.6;
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
        }

        /* 导航栏 */
        .navbar {
            background-color: var(--white);
            height: 72px;
            box-shadow: none;
            border-bottom: 1px solid var(--border-light);
            padding: 0 24px;
            transition: var(--transition-base);
        }

        .navbar-brand {
            font-weight: 700;
            font-size: 24px;
            letter-spacing: -0.5px;
            color: var(--brand-ink) !important;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .brand-icon {
            color: var(--brand-orange);
            font-size: 28px;
            line-height: 1;
        }

        .navbar-nav .nav-link {
            color: var(--brand-ink) !important;
            font-weight: 500;
            margin: 0 12px;
            padding: 8px 4px !important;
            position: relative;
            transition: var(--transition-base);
            font-size: 16px;
        }

        .navbar-nav .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--brand-orange);
            transition: width 0.25s ease;
        }

        .navbar-nav .nav-link:hover {
            color: var(--brand-orange) !important;
        }

        .navbar-nav .nav-link:hover::after,
        .navbar-nav .nav-link.active::after {
            width: 100%;
        }

        .navbar-nav .nav-link.active {
            color: var(--brand-orange) !important;
            font-weight: 700;
        }

        .navbar-toggler {
            border: none;
            box-shadow: none;
        }

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(15, 23, 42, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        @media (max-width: 992px) {
            .navbar-collapse {
                background: var(--white);
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                box-shadow: var(--shadow-md);
                padding: 16px 24px;
                border-radius: 0 0 var(--radius-card) var(--radius-card);
                z-index: 100;
            }
            .navbar-nav {
                gap: 8px;
            }
            .navbar-nav .nav-link {
                padding: 12px 4px !important;
            }
        }

        /* 容器 */
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        section {
            padding: 80px 0;
        }

        /* Hero */
        .hero-section {
            background: linear-gradient(135deg, #F8FAFC 0%, #E2E8F0 100%);
            position: relative;
            overflow: hidden;
            min-height: 85vh;
            display: flex;
            align-items: center;
            padding: 0 0;
        }

        .hero-bg-image {
            position: absolute;
            right: -10%;
            top: 50%;
            transform: translateY(-50%);
            width: 55%;
            height: 90%;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: contain;
            background-repeat: no-repeat;
            background-position: center;
            opacity: 0.9;
            filter: drop-shadow(0 20px 40px rgba(0,0,0,0.15));
            z-index: 0;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 600px;
        }

        .hero-content h1 {
            font-size: 52px;
            font-weight: 700;
            letter-spacing: -0.5px;
            color: var(--brand-ink);
            line-height: 1.2;
            margin-bottom: 20px;
        }

        .hero-content .lead {
            font-size: 18px;
            color: #475569;
            margin-bottom: 32px;
            line-height: 1.7;
        }

        .btn-brand {
            background-color: var(--brand-orange);
            border: none;
            color: white;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            transition: var(--transition-base);
            font-size: 16px;
            box-shadow: 0 4px 12px rgba(255, 79, 30, 0.3);
        }

        .btn-brand:hover {
            background-color: var(--brand-orange-deep);
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255, 79, 30, 0.4);
        }

        .btn-outline-ink {
            border: 1.5px solid var(--brand-ink);
            background: transparent;
            color: var(--brand-ink);
            font-weight: 600;
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            transition: var(--transition-base);
            font-size: 16px;
        }

        .btn-outline-ink:hover {
            background-color: rgba(255, 79, 30, 0.08);
            border-color: var(--brand-orange);
            color: var(--brand-orange);
        }

        @media (max-width: 768px) {
            .hero-section {
                min-height: auto;
                padding: 48px 0;
            }
            .hero-content h1 {
                font-size: 36px;
            }
            .hero-bg-image {
                position: relative;
                right: auto;
                top: auto;
                transform: none;
                width: 100%;
                height: 250px;
                margin-top: 24px;
                opacity: 0.7;
            }
            section {
                padding: 64px 0;
            }
        }

        /* 板块标题 */
        .section-title h2 {
            font-size: 36px;
            font-weight: 700;
            color: var(--brand-ink);
            margin-bottom: 12px;
        }

        .section-title .divider {
            width: 60px;
            height: 4px;
            background: var(--brand-orange);
            margin: 16px auto 24px;
            border-radius: 2px;
        }

        .section-title p {
            color: var(--text-secondary);
            font-size: 18px;
            max-width: 700px;
            margin: 0 auto;
        }

        /* 卡片 */
        .card-custom {
            background: var(--white);
            border: none;
            border-radius: var(--radius-card);
            padding: 32px 24px;
            box-shadow: var(--shadow-sm);
            transition: all 0.25s ease;
            height: 100%;
            position: relative;
            overflow: hidden;
        }

        .card-custom::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: transparent;
            transition: background 0.25s ease;
        }

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

        .card-custom:hover::before {
            background: var(--brand-orange);
        }

        .card-icon {
            font-size: 40px;
            color: var(--brand-orange);
            margin-bottom: 20px;
            display: block;
        }

        .card-custom h3 {
            font-size: 22px;
            font-weight: 600;
            color: var(--brand-ink);
            margin-bottom: 12px;
        }

        .card-custom p {
            color: var(--text-secondary);
            font-size: 16px;
            line-height: 1.7;
        }

        .data-badge {
            background: rgba(255, 79, 30, 0.1);
            color: var(--brand-orange);
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 14px;
            display: inline-block;
            margin-bottom: 8px;
        }

        /* 案例卡片 */
        .case-card {
            background: var(--white);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition-base);
        }

        .case-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }

        .case-img {
            height: 160px;
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 700;
            font-size: 24px;
            background-color: #1E293B;
        }

        /* FAQ */
        .accordion-button {
            font-weight: 600;
            font-size: 18px;
            color: var(--brand-ink);
            background-color: var(--soft-bg);
            border: none;
            box-shadow: none;
            border-radius: var(--radius-card) !important;
            padding: 20px 24px;
        }

        .accordion-button:not(.collapsed) {
            background-color: var(--white);
            color: var(--brand-orange);
            box-shadow: none;
            border-bottom: 1px solid var(--border-light);
        }

        .accordion-button::after {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23FF4F1E'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
        }

        .accordion-body {
            font-size: 16px;
            color: var(--text-secondary);
            background: var(--white);
            padding: 20px 24px;
            line-height: 1.7;
        }

        /* 表单 */
        .form-control-custom {
            border-radius: var(--radius-btn);
            border: 1.5px solid var(--border-light);
            padding: 14px 18px;
            font-size: 16px;
            transition: 0.2s;
        }

        .form-control-custom:focus {
            border-color: var(--brand-orange);
            box-shadow: 0 0 0 3px rgba(255, 79, 30, 0.2);
        }

        /* Footer */
        .footer-dark {
            background: #0B1120;
            color: #CBD5E1;
            padding: 60px 0 30px;
        }

        .footer-dark a {
            color: #CBD5E1;
            text-decoration: none;
            transition: color 0.2s;
        }

        .footer-dark a:hover {
            color: var(--brand-orange);
        }

        .footer-logo {
            font-size: 28px;
            font-weight: 700;
            color: white;
        }