/* roulang page: index */
:root {
            --primary-red: #D32F2F;
            --primary-red-hover: #B71C1C;
            --titanium-black: #1A1A1A;
            --ice-white: #FAFAFA;
            --track-yellow: #FFB300;
            --track-yellow-hover: #E5A000;
            --body-text: #4A4A4A;
            --light-text: #8A8A8A;
            --border-light: #E5E5E5;
            --bg-light: #F5F5F7;
            --bg-footer: #111111;
            --radius-card: 12px;
            --radius-btn: 8px;
            --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --transition-base: 0.25s ease;
        }

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.6;
            color: var(--body-text);
            background-color: #FFFFFF;
            -webkit-font-smoothing: antialiased;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--titanium-black);
            font-weight: 600;
            line-height: 1.3;
        }

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

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

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

        /* 自定义 Bootstrap 覆盖 */
        .btn-primary-custom {
            background-color: var(--primary-red);
            border: none;
            color: #FFFFFF;
            font-weight: 600;
            border-radius: var(--radius-btn);
            padding: 14px 32px;
            transition: background-color var(--transition-base), box-shadow var(--transition-base);
            font-size: 16px;
        }

        .btn-primary-custom:hover {
            background-color: var(--primary-red-hover);
            box-shadow: 0 4px 14px rgba(211, 47, 47, 0.3);
            color: #FFFFFF;
        }

        .btn-secondary-custom {
            background: transparent;
            border: 1.5px solid var(--titanium-black);
            color: var(--titanium-black);
            font-weight: 600;
            border-radius: var(--radius-btn);
            padding: 14px 32px;
            transition: all var(--transition-base);
            font-size: 16px;
        }

        .btn-secondary-custom:hover {
            background-color: var(--titanium-black);
            color: #FFFFFF;
        }

        .btn-yellow-custom {
            background-color: var(--track-yellow);
            border: none;
            color: var(--titanium-black);
            font-weight: 700;
            border-radius: var(--radius-btn);
            padding: 16px 40px;
            transition: background-color var(--transition-base), box-shadow var(--transition-base);
            font-size: 18px;
        }

        .btn-yellow-custom:hover {
            background-color: var(--track-yellow-hover);
            box-shadow: 0 6px 18px rgba(255, 179, 0, 0.4);
            color: var(--titanium-black);
        }

        .btn-outline-white {
            background: transparent;
            border: 1.5px solid #FFFFFF;
            color: #FFFFFF;
            font-weight: 600;
            border-radius: var(--radius-btn);
            padding: 14px 32px;
            transition: all var(--transition-base);
        }

        .btn-outline-white:hover {
            background-color: #FFFFFF;
            color: var(--titanium-black);
        }

        .card-custom {
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            padding: 32px;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
            height: 100%;
        }

        .card-custom:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: transparent;
        }

        .section-padding {
            padding-top: 100px;
            padding-bottom: 100px;
        }

        .bg-light-gray {
            background-color: var(--bg-light);
        }

        .bg-deep-black {
            background-color: var(--titanium-black);
        }

        .bg-footer-dark {
            background-color: var(--bg-footer);
        }

        /* 导航栏 */
        .navbar-custom {
            background-color: #FFFFFF;
            box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
            border-bottom: 1px solid var(--border-light);
            height: 72px;
            padding: 0;
        }

        .navbar-brand-custom {
            font-weight: 700;
            font-size: 20px;
            color: var(--primary-red) !important;
            display: flex;
            align-items: center;
        }

        .navbar-brand-custom i {
            font-size: 1.8rem;
            margin-right: 8px;
            color: var(--primary-red);
        }

        .nav-link-custom {
            font-size: 15px;
            font-weight: 500;
            color: var(--body-text) !important;
            padding: 0 18px;
            position: relative;
            transition: color var(--transition-base);
        }

        .nav-link-custom:hover {
            color: var(--primary-red) !important;
        }

        .nav-link-custom::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            width: 0;
            height: 2px;
            background-color: var(--primary-red);
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }

        .nav-link-custom:hover::after {
            width: 100%;
        }

        .search-box {
            background-color: var(--bg-light);
            border-radius: 20px;
            padding: 6px 15px;
            display: flex;
            align-items: center;
            margin-right: 15px;
        }

        .search-box input {
            border: none;
            background: transparent;
            outline: none;
            font-size: 14px;
            width: 120px;
            padding-left: 5px;
        }

        .search-box i {
            color: var(--light-text);
            font-size: 14px;
        }

        .btn-consult-nav {
            font-size: 14px;
            padding: 8px 20px;
            background-color: var(--primary-red);
            color: #FFF;
            border-radius: 20px;
            font-weight: 600;
            border: none;
            transition: background var(--transition-base);
        }

        .btn-consult-nav:hover {
            background-color: var(--primary-red-hover);
        }

        /* Hero */
        #hero {
            height: 100vh;
            min-height: 600px;
            background: linear-gradient(90deg, rgba(0, 0, 0, 0.75) 0%, rgba(0, 0, 0, 0.15) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            display: flex;
            align-items: center;
            color: #FFFFFF;
        }

        .hero-title {
            font-size: 48px;
            line-height: 1.25;
            font-weight: 700;
            letter-spacing: -0.5px;
            color: #FFFFFF;
            max-width: 550px;
        }

        .hero-subtitle {
            font-size: 18px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.9);
            max-width: 480px;
            margin-top: 20px;
            margin-bottom: 35px;
        }

        /* 板块标题 */
        .section-title {
            font-size: 36px;
            line-height: 1.3;
            font-weight: 600;
            color: var(--titanium-black);
            margin-bottom: 16px;
        }

        .section-desc {
            font-size: 16px;
            color: var(--light-text);
            max-width: 640px;
            margin: 0 auto 50px;
        }

        /* 痛点 */
        .pain-item {
            display: flex;
            align-items: flex-start;
            background: #FFF;
            padding: 30px;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-sm);
            margin-bottom: 24px;
        }

        .pain-icon {
            font-size: 2.2rem;
            color: var(--primary-red);
            margin-right: 25px;
            flex-shrink: 0;
        }

        /* 解决方案非对称卡片 */
        .solution-grid {
            display: grid;
            grid-template-columns: 5fr 3fr;
            gap: 24px;
        }

        .solution-left {
            height: 420px;
        }

        .solution-right-stack {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .solution-right-item {
            height: 200px;
        }

        .card-link-arrow {
            font-weight: 600;
            color: var(--primary-red);
            display: inline-flex;
            align-items: center;
            margin-top: 12px;
        }

        .card-link-arrow i {
            transition: transform 0.2s ease;
            margin-left: 6px;
        }

        .card-link-arrow:hover i {
            transform: translateX(6px);
        }

        /* 数据成果 */
        .stat-number {
            font-size: 48px;
            font-weight: 700;
            color: var(--primary-red);
            line-height: 1.1;
        }

        .stat-label {
            font-size: 14px;
            color: var(--light-text);
            font-weight: 500;
            margin-top: 5px;
        }

        /* 证言 */
        .testimonial-card {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            padding: 40px;
            box-shadow: var(--shadow-sm);
            position: relative;
        }

        .quote-icon {
            font-size: 120px;
            color: var(--primary-red);
            opacity: 0.08;
            position: absolute;
            top: 5px;
            left: 20px;
            line-height: 1;
        }

        .testimonial-text {
            font-size: 18px;
            line-height: 1.6;
            font-style: italic;
            color: var(--titanium-black);
            position: relative;
        }

        .avatar-img {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            border: 2px solid var(--primary-red);
        }

        /* FAQ 手风琴 */
        .accordion-custom .accordion-button {
            font-weight: 600;
            font-size: 18px;
            color: var(--titanium-black);
            background: transparent;
            box-shadow: none;
            border: none;
            border-bottom: 1px solid var(--border-light);
            padding: 20px 0;
        }

        .accordion-custom .accordion-button:not(.collapsed) {
            background: transparent;
            color: var(--primary-red);
            box-shadow: none;
        }

        .accordion-custom .accordion-button::after {
            background-image: none;
            content: "+";
            font-size: 24px;
            font-weight: 300;
            color: var(--primary-red);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .accordion-custom .accordion-button:not(.collapsed)::after {
            content: "−";
        }

        .accordion-custom .accordion-body {
            padding: 0 0 20px 0;
            font-size: 15px;
            line-height: 1.6;
            color: #6A6A6A;
        }

        /* 最终CTA */
        .cta-title {
            color: #FFFFFF;
            font-size: 36px;
            font-weight: 600;
        }

        .cta-desc {
            color: rgba(255, 255, 255, 0.75);
            font-size: 16px;
            margin: 15px 0 30px;
        }

        /* 页脚 */
        .footer-heading {
            color: #FFFFFF;
            font-weight: 600;
            margin-bottom: 20px;
            font-size: 18px;
        }

        .footer-link {
            color: #999;
            font-size: 14px;
            margin-bottom: 10px;
            display: block;
            transition: color 0.2s;
        }

        .footer-link:hover {
            color: #FFFFFF;
        }

        .copyright {
            border-top: 1px solid #333;
            color: #666;
            font-size: 12px;
        }

        @media (max-width: 991px) {
            .solution-grid {
                grid-template-columns: 1fr;
            }
            .solution-left, .solution-right-item {
                height: auto;
            }
        }

        @media (max-width: 767px) {
            .hero-title {
                font-size: 32px;
                line-height: 1.2;
            }
            .section-title {
                font-size: 26px;
            }
            .section-padding {
                padding-top: 60px;
                padding-bottom: 60px;
            }
            .stat-number {
                font-size: 36px;
            }
            .navbar-custom {
                height: auto;
            }
        }