/* roulang page: index */
:root {
            --deep-ink: #0A0E27;
            --electric-rose: #FF2D55;
            --cyan-glow: #00E5FF;
            --warm-bg: #F5F3F0;
            --card-white: #FFFFFF;
            --text-dark: #2D3340;
            --text-muted: #6B7280;
            --text-light-muted: #B0B7C3;
            --border-light: #E0DCD5;
            --zebra-stripe: #FAF9F7;
            --card-shadow: 0 1px 3px rgba(10,14,39,0.04), 0 6px 16px rgba(10,14,39,0.06);
            --card-shadow-hover: 0 4px 12px rgba(10,14,39,0.08), 0 12px 28px rgba(255,45,85,0.12);
            --card-radius-lg: 12px;
            --card-radius-sm: 8px;
            --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
            --font-mono: "Inter", "SF Pro Display", system-ui;
        }

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

        body {
            font-family: var(--font-sans);
            background-color: var(--warm-bg);
            color: var(--text-dark);
            line-height: 1.75;
            margin: 0;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        h1, h2, h3, h4, h5, h6 {
            font-weight: 600;
            line-height: 1.35;
            color: var(--deep-ink);
        }

        h1 {
            font-size: 3.2rem;
            font-weight: 700;
            letter-spacing: -0.5px;
            line-height: 1.2;
        }

        h2 {
            font-size: 2.2rem;
            font-weight: 600;
            margin-bottom: 1.5rem;
        }

        h3 {
            font-size: 1.3rem;
            font-weight: 600;
            line-height: 1.4;
        }

        p {
            font-size: 1rem;
            font-weight: 400;
            color: var(--text-dark);
            margin-bottom: 1.2rem;
        }

        .text-muted-custom {
            color: var(--text-muted) !important;
        }

        .container {
            max-width: 1140px;
            padding-left: 20px;
            padding-right: 20px;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s;
        }

        a:hover {
            color: var(--cyan-glow);
        }

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

        .btn {
            border-radius: var(--card-radius-sm);
            padding: 0.75rem 1.75rem;
            font-weight: 600;
            transition: all 0.25s ease;
            border: 2px solid transparent;
        }

        .btn-primary-custom {
            background-color: var(--electric-rose);
            border-color: var(--electric-rose);
            color: white;
        }

        .btn-primary-custom:hover,
        .btn-primary-custom:focus {
            background-color: #D61E44;
            border-color: #D61E44;
            color: white;
            box-shadow: 0 4px 12px rgba(255,45,85,0.4);
            transform: translateY(-2px);
        }

        .btn-outline-light-custom {
            border-color: #FFFFFF;
            color: #FFFFFF;
            background: transparent;
        }

        .btn-outline-dark-custom {
            border-color: var(--deep-ink);
            color: var(--deep-ink);
            background: transparent;
        }

        .btn-outline-light-custom:hover,
        .btn-outline-dark-custom:hover {
            opacity: 0.9;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }

        .btn-outline-light-custom:hover {
            background-color: rgba(255,255,255,0.1);
            border-color: white;
            color: white;
        }

        .btn-outline-dark-custom:hover {
            background-color: rgba(10,14,39,0.05);
            border-color: var(--deep-ink);
            color: var(--deep-ink);
        }

        /* 卡片化导航 */
        .navbar-xiaoai {
            background: rgba(10, 14, 39, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-radius: 16px;
            margin: 12px auto 0;
            width: calc(100% - 40px);
            max-width: 1140px;
            padding: 0.8rem 1.5rem;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1050;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            border: 1px solid rgba(255,255,255,0.1);
        }

        .navbar-brand-custom {
            font-size: 1.5rem;
            font-weight: 700;
            color: white !important;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .logo-icon {
            color: var(--cyan-glow);
            font-size: 1.8rem;
        }

        .nav-link-custom {
            color: rgba(255,255,255,0.8) !important;
            font-weight: 500;
            padding: 0.5rem 1rem !important;
            border-radius: 8px;
            background: rgba(255,255,255,0.05);
            margin: 0 0.2rem;
            transition: all 0.2s;
            font-size: 0.95rem;
        }

        .nav-link-custom:hover,
        .nav-link-custom.active {
            color: white !important;
            background: rgba(255,255,255,0.15);
        }

        .navbar-cta {
            background: var(--electric-rose);
            color: white !important;
            border-radius: 8px;
            padding: 0.5rem 1.2rem !important;
            font-weight: 600;
            margin-left: 1rem;
            transition: all 0.2s;
        }

        .navbar-cta:hover {
            background: #D61E44;
            color: white;
            transform: translateY(-1px);
        }

        .navbar-toggler {
            border: none;
            color: white;
            font-size: 1.5rem;
        }

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

        @media (max-width: 991px) {
            .navbar-collapse {
                background: rgba(10,14,39,0.95);
                backdrop-filter: blur(12px);
                border-radius: 16px;
                padding: 1rem;
                margin-top: 0.8rem;
            }
            .nav-link-custom {
                margin: 0.2rem 0;
            }
            .navbar-cta {
                margin-left: 0;
                margin-top: 0.5rem;
                text-align: center;
                display: block;
            }
        }

        /* Hero 双栏 */
        .hero-section {
            padding: 140px 0 80px;
            background: var(--deep-ink);
            margin-top: 0;
        }

        .hero-left h1 {
            color: white;
            margin-bottom: 1.2rem;
        }

        .hero-subtitle {
            font-size: 1.25rem;
            color: var(--text-light-muted);
            margin-bottom: 1.5rem;
        }

        .hero-desc {
            color: #B0B7C3;
            margin-bottom: 2rem;
            font-size: 1.05rem;
        }

        .hero-stats {
            display: flex;
            gap: 2rem;
            margin-top: 2.5rem;
        }

        .stat-item h3 {
            font-family: var(--font-mono);
            color: var(--cyan-glow);
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.2rem;
        }

        .stat-item p {
            color: var(--text-light-muted);
            font-size: 0.9rem;
            margin: 0;
        }

        .hero-right img {
            box-shadow: 0 20px 40px rgba(0,0,0,0.5);
            border-radius: var(--card-radius-lg);
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 2.5rem;
            }
            .hero-stats {
                flex-wrap: wrap;
                gap: 1rem;
            }
            .hero-right {
                margin-top: 2rem;
            }
        }

        /* 区块通用 */
        .section-padding {
            padding: 80px 0;
        }

        .section-title {
            margin-bottom: 3rem;
            text-align: center;
        }

        .section-title h2 {
            margin-bottom: 0.8rem;
        }

        .cyan-line {
            width: 60px;
            height: 3px;
            background: var(--cyan-glow);
            margin: 0.5rem auto 1rem;
        }

        /* 六宫格亮点 */
        .feature-card {
            background: var(--card-white);
            padding: 2rem 1.8rem;
            border-radius: var(--card-radius-lg);
            box-shadow: var(--card-shadow);
            transition: all 0.3s ease;
            height: 100%;
            text-align: left;
            border: 1px solid rgba(0,0,0,0.03);
        }

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

        .feature-icon {
            font-size: 2.2rem;
            color: var(--cyan-glow);
            margin-bottom: 1.2rem;
        }

        .feature-card h3 {
            margin-bottom: 0.6rem;
        }

        .feature-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* 案例瀑布 */
        .case-card {
            background: var(--card-white);
            border-radius: var(--card-radius-lg);
            overflow: hidden;
            box-shadow: var(--card-shadow);
            transition: all 0.3s ease;
            margin-bottom: 28px;
            break-inside: avoid;
        }

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

        .case-img-wrap {
            overflow: hidden;
        }

        .case-img-wrap img {
            transition: transform 0.4s ease;
            border-radius: 0;
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
        }

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

        .case-body {
            padding: 1.2rem 1.5rem;
        }

        .case-tag {
            background: var(--electric-rose);
            color: white;
            font-size: 0.7rem;
            padding: 0.2rem 0.8rem;
            border-radius: 20px;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 0.5rem;
        }

        .case-body h3 {
            font-size: 1.1rem;
        }

        .case-body p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin: 0;
        }

        .masonry-grid {
            column-count: 3;
            column-gap: 28px;
        }

        @media (max-width: 991px) {
            .masonry-grid {
                column-count: 2;
            }
        }

        @media (max-width: 576px) {
            .masonry-grid {
                column-count: 1;
            }
        }

        /* 方案对比表 */
        .pricing-table {
            background: var(--card-white);
            border-radius: var(--card-radius-lg);
            overflow: hidden;
            box-shadow: var(--card-shadow);
        }

        .table-header {
            background: var(--deep-ink);
            color: white;
            padding: 1.8rem;
            text-align: center;
        }

        .table-header h3 {
            color: white;
            margin: 0;
            font-size: 1.8rem;
        }

        .table-header .badge-recommend {
            background: var(--electric-rose);
            font-size: 0.8rem;
            padding: 0.3rem 1rem;
            border-radius: 20px;
            margin-top: 0.5rem;
        }

        .table-row {
            display: flex;
            padding: 1rem 1.8rem;
            border-bottom: 1px solid var(--border-light);
            align-items: center;
        }

        .table-row:nth-child(odd) {
            background: var(--zebra-stripe);
        }

        .table-col-left {
            width: 45%;
            font-weight: 500;
        }

        .table-col-right {
            width: 45%;
        }

        .vs-divider {
            width: 10%;
            text-align: center;
            font-weight: 700;
            color: var(--electric-rose);
        }

        @media (max-width: 768px) {
            .table-row {
                flex-direction: column;
                gap: 0.5rem;
            }
            .table-col-left,
            .table-col-right,
            .vs-divider {
                width: 100%;
                text-align: left;
            }
            .vs-divider {
                display: none;
            }
        }

        /* FAQ 手风琴 */
        .accordion-xiaoai .accordion-item {
            border: none;
            border-bottom: 1px solid var(--border-light);
            background: transparent;
        }

        .accordion-xiaoai .accordion-button {
            font-weight: 600;
            font-size: 1rem;
            color: var(--deep-ink);
            background: transparent;
            box-shadow: none;
            padding: 1.2rem 0;
            display: flex;
            align-items: center;
        }

        .accordion-xiaoai .accordion-button::before {
            content: '';
            width: 8px;
            height: 8px;
            background: var(--cyan-glow);
            border-radius: 50%;
            margin-right: 1rem;
            transition: background 0.2s;
        }

        .accordion-xiaoai .accordion-button:not(.collapsed)::before {
            background: var(--electric-rose);
        }

        .accordion-xiaoai .accordion-button:focus {
            border-color: transparent;
            box-shadow: none;
        }

        .accordion-xiaoai .accordion-body {
            padding: 0 0 1.2rem 2rem;
            color: var(--text-muted);
            line-height: 1.8;
        }

        /* CTA 深色区 */
        .cta-section {
            background: var(--deep-ink);
            padding: 80px 0;
        }

        .cta-section h2 {
            color: white;
        }

        .cta-section p {
            color: var(--text-light-muted);
        }

        .form-control-custom {
            background: white;
            border: 1px solid var(--border-light);
            border-radius: 8px;
            padding: 0.8rem 1rem;
            font-size: 1rem;
            transition: 0.2s;
        }

        .form-control-custom:focus {
            border-color: var(--cyan-glow);
            box-shadow: 0 0 0 2px rgba(0,229,255,0.25);
            outline: none;
        }

        /* 页脚 */
        .footer-section {
            background: var(--deep-ink);
            padding: 60px 0 30px;
            color: var(--text-light-muted);
        }

        .footer-section a {
            color: var(--text-light-muted);
        }

        .footer-section a:hover {
            color: var(--cyan-glow);
        }

        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
        }

        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            margin-top: 2rem;
            padding-top: 1.5rem;
            font-size: 0.9rem;
        }

        /* 图片通用 */
        .img-rounded {
            border-radius: var(--card-radius-lg);
        }