/* roulang page: index */
:root {
            --primary: #F15A24;
            --primary-hover: #D94E1E;
            --secondary: #2C2E33;
            --bg: #FAF8F5;
            --accent: #00A86B;
            --text-body: #4A4C52;
            --text-light: #8A8D93;
            --text-weak: #B0B3B8;
            --white: #FFFFFF;
            --border-light: #E5E3DF;
            --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
            --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-input: 6px;
            --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --transition: 0.2s ease;
            --spacing-section: 100px;
        }

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

        body {
            font-family: var(--font-family);
            background-color: var(--bg);
            color: var(--text-body);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--secondary);
            font-weight: 600;
            line-height: 1.3;
            margin-bottom: 0.75rem;
        }

        h1 {
            font-size: 36px;
            line-height: 48px;
            font-weight: 700;
            letter-spacing: -0.5px;
        }
        h2 {
            font-size: 28px;
            line-height: 38px;
            font-weight: 600;
            margin-bottom: 1rem;
        }
        h3 {
            font-size: 20px;
            line-height: 28px;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        h4 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

        p {
            margin-bottom: 1rem;
            color: var(--text-body);
        }
        .text-light {
            color: var(--text-light);
            font-size: 14px;
            line-height: 20px;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: var(--primary-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 16px;
            padding-right: 16px;
        }

        /* 覆盖 Bootstrap 默认 */
        .btn {
            border-radius: var(--radius-btn);
            font-weight: 500;
            transition: all var(--transition);
            padding: 10px 20px;
            font-size: 16px;
        }
        .btn-primary {
            background-color: var(--primary);
            border: none;
            color: var(--white);
        }
        .btn-primary:hover, .btn-primary:focus {
            background-color: var(--primary-hover);
            box-shadow: 0 4px 12px rgba(241, 90, 36, 0.3);
            transform: translateY(-2px);
            color: var(--white);
        }
        .btn-outline-secondary {
            background-color: transparent;
            border: 1.5px solid var(--secondary);
            color: var(--secondary);
        }
        .btn-outline-secondary:hover, .btn-outline-secondary:focus {
            background-color: var(--secondary);
            color: var(--white);
            transform: translateY(-2px);
        }
        .btn-outline-light {
            background: transparent;
            border: 1px solid var(--white);
            color: var(--white);
        }
        .btn-outline-light:hover {
            background: var(--white);
            color: var(--primary);
        }

        /* 导航栏 */
        .navbar {
            background-color: var(--bg);
            padding: 12px 0;
            transition: box-shadow 0.3s ease;
            font-family: var(--font-family);
        }
        .navbar.scrolled {
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            color: var(--secondary) !important;
            font-size: 1.4rem;
            letter-spacing: 0.5px;
        }
        .navbar-brand img {
            height: 36px;
            width: auto;
        }
        .nav-link {
            color: var(--secondary) !important;
            font-weight: 500;
            margin: 0 8px;
            transition: color 0.2s;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary) !important;
        }
        .nav-link.active::after {
            content: "";
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary);
        }
        .navbar-toggler {
            border: none;
            color: var(--primary);
            font-size: 1.5rem;
        }
        .navbar-toggler:focus {
            box-shadow: none;
        }
        .navbar .btn-sm {
            padding: 6px 14px;
            font-size: 14px;
        }
        @media (max-width: 992px) {
            .navbar .navbar-collapse {
                background: var(--bg);
                padding: 20px;
                border-radius: var(--radius-card);
                box-shadow: var(--shadow-md);
                margin-top: 10px;
            }
            .navbar .d-flex.align-items-center.gap-2 {
                flex-direction: column;
                margin-top: 15px;
                gap: 10px !important;
            }
        }

        /* 首屏 Hero */
        .hero-section {
            padding-top: 100px;
            padding-bottom: 40px;
            background: var(--bg);
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        .hero-image {
            position: relative;
            border-radius: var(--radius-card);
            overflow: hidden;
            height: 500px;
            box-shadow: var(--shadow-lg);
        }
        .hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            object-position: center 20%;
            filter: blur(0.5px) brightness(1.05);
            transform: scale(1.02);
        }
        .hero-image::after {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to right, rgba(250,248,245,0.8) 0%, rgba(250,248,245,0.2) 50%, transparent 100%);
            pointer-events: none;
        }
        @media (max-width: 768px) {
            .hero-image {
                height: 280px;
                margin-top: 30px;
            }
            h1 {
                font-size: 32px;
                line-height: 42px;
            }
        }

        /* 板块间距 */
        section {
            padding: var(--spacing-section) 0;
        }
        @media (max-width: 768px) {
            section {
                padding: 60px 0;
            }
        }

        /* 亮点卡片 */
        .feature-card {
            background: var(--white);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid transparent;
            transition: all 0.25s ease;
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary);
        }
        .feature-icon {
            font-size: 36px;
            color: var(--primary);
            margin-bottom: 16px;
            display: block;
        }

        /* 案例瀑布流 */
        .masonry-grid {
            column-count: 2;
            column-gap: 24px;
        }
        .masonry-item {
            break-inside: avoid;
            margin-bottom: 24px;
            background: var(--white);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: all 0.3s ease;
        }
        .masonry-item:hover {
            box-shadow: var(--shadow-md);
        }
        .masonry-item img {
            width: 100%;
            height: auto;
            object-fit: cover;
            transition: transform 0.3s ease;
        }
        .masonry-item:hover img {
            transform: scale(1.03);
        }
        .masonry-item .card-content {
            padding: 20px 24px 24px;
        }
        @media (max-width: 768px) {
            .masonry-grid {
                column-count: 1;
            }
        }

        /* 方案对比卡 */
        .plan-card {
            background: var(--white);
            border-radius: var(--radius-card);
            padding: 32px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px dashed var(--border-light);
            display: flex;
            flex-direction: column;
            height: 100%;
            transition: all 0.2s;
        }
        .plan-card.recommended {
            border: 2px solid var(--primary);
            box-shadow: var(--shadow-lg);
            transform: scale(1.02);
        }
        .plan-list {
            list-style: none;
            padding: 0;
            margin: 20px 0;
            flex: 1;
        }
        .plan-list li {
            padding: 8px 0;
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-body);
        }
        .plan-list i.fa-check-circle {
            color: var(--accent);
            font-size: 1.2rem;
        }
        @media (max-width: 768px) {
            .plan-card.recommended {
                transform: none;
            }
        }

        /* FAQ 手风琴 */
        .accordion-button {
            font-weight: 600;
            color: var(--secondary);
            background-color: transparent;
            box-shadow: none;
            border: none;
            padding: 16px 0;
            font-size: 18px;
            border-bottom: 1px solid var(--border-light);
            transition: all 0.3s;
        }
        .accordion-button:not(.collapsed) {
            background-color: #F5F2ED;
            color: var(--primary);
            box-shadow: none;
        }
        .accordion-button::after {
            background-image: none;
            content: "\f107";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            transition: transform 0.3s ease;
        }
        .accordion-button:not(.collapsed)::after {
            transform: rotate(180deg);
        }
        .accordion-body {
            padding: 16px 0;
            color: var(--text-body);
            line-height: 1.8;
        }

        /* CTA 横幅 */
        .cta-banner {
            background: linear-gradient(135deg, #2C2E33 0%, #F15A24 100%);
            padding: 120px 0;
            color: var(--white);
            text-align: center;
        }
        .cta-banner h2 {
            color: white;
            font-weight: 700;
        }
        .btn-light-custom {
            background: white;
            color: var(--primary);
            font-weight: 600;
            padding: 12px 32px;
            border-radius: var(--radius-btn);
            border: none;
            transition: all 0.2s;
        }
        .btn-light-custom:hover {
            background: #f0f0f0;
            transform: translateY(-2px);
        }

        /* 页脚 */
        footer {
            background: var(--secondary);
            color: var(--text-weak);
            padding: 60px 0 20px;
        }
        footer a {
            color: var(--text-weak);
            text-decoration: none;
            transition: color 0.2s;
        }
        footer a:hover {
            color: var(--white);
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            border: 1px solid var(--text-weak);
            margin-right: 8px;
            color: var(--text-weak);
            font-size: 18px;
            transition: all 0.2s;
        }
        .social-icons a:hover {
            border-color: var(--primary);
            color: var(--primary);
        }