/* roulang page: index */
:root {
            --brand-primary: #12161a;
            --brand-accent: #e53935;
            --brand-accent-hover: #c62828;
            --brand-subtle: #242b35;
            --brand-light: #f8f9fa;
            --brand-dark: #0a0d10;
            --text-main: #1e293b;
            --text-muted: #64748b;
            --border-color: #e2e8f0;
            --card-radius: 12px;
            --transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #ffffff;
            line-height: 1.65;
            overflow-x: hidden;
        }

        /* 顶部导航定制 */
        .crow-navbar {
            background-color: rgba(10, 13, 16, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            transition: var(--transition-smooth);
        }
        .crow-navbar .navbar-brand {
            font-size: 1.45rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .crow-navbar .navbar-brand span {
            color: var(--brand-accent);
        }
        .crow-navbar .nav-link {
            color: #cbd5e1;
            font-weight: 500;
            padding: 0.5rem 1.1rem;
            transition: var(--transition-smooth);
        }
        .crow-navbar .nav-link:hover,
        .crow-navbar .nav-link.active {
            color: #ffffff;
            background-color: rgba(255, 255, 255, 0.06);
            border-radius: 6px;
        }

        /* 按钮与徽章 */
        .btn-brand {
            background-color: var(--brand-accent);
            color: #ffffff;
            font-weight: 600;
            border-radius: 6px;
            padding: 0.65rem 1.4rem;
            border: 1px solid var(--brand-accent);
            transition: var(--transition-smooth);
        }
        .btn-brand:hover {
            background-color: var(--brand-accent-hover);
            border-color: var(--brand-accent-hover);
            color: #ffffff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(229, 57, 53, 0.25);
        }
        .btn-outline-brand {
            background-color: transparent;
            color: #ffffff;
            font-weight: 600;
            border-radius: 6px;
            padding: 0.65rem 1.4rem;
            border: 1px solid rgba(255, 255, 255, 0.25);
            transition: var(--transition-smooth);
        }
        .btn-outline-brand:hover {
            background-color: rgba(255, 255, 255, 0.1);
            color: #ffffff;
            border-color: #ffffff;
        }
        .crow-badge {
            display: inline-block;
            padding: 0.35rem 0.75rem;
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.5px;
            border-radius: 4px;
            background-color: rgba(229, 57, 53, 0.12);
            color: var(--brand-accent);
            margin-bottom: 0.75rem;
        }

        /* Hero 区域：短视频种草拼团转化版式 */
        .hero-section {
            background: linear-gradient(135deg, #0a0d10 0%, #161c24 100%);
            color: #ffffff;
            padding: 5rem 0 4.5rem;
            position: relative;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }
        .hero-group-box {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--card-radius);
            padding: 1.5rem;
        }
        .avatar-group {
            display: flex;
            align-items: center;
        }
        .avatar-group img {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            border: 2px solid #161c24;
            margin-left: -10px;
        }
        .avatar-group img:first-child {
            margin-left: 0;
        }

        /* 板块通用基础 */
        .crow-section {
            padding: 4.5rem 0;
            position: relative;
        }
        .crow-section-alt {
            background-color: #f8fafc;
        }
        .section-header {
            margin-bottom: 3rem;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 0.75rem;
            color: #0f172a;
        }
        .section-desc {
            color: var(--text-muted);
            max-width: 760px;
            font-size: 1.05rem;
        }

        /* 卡片定制 */
        .crow-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--card-radius);
            padding: 1.75rem;
            height: 100%;
            transition: var(--transition-smooth);
        }
        .crow-card:hover {
            border-color: #cbd5e1;
            transform: translateY(-4px);
            box-shadow: 0 12px 28px rgba(0, 0, 0, 0.05);
        }
        .crow-icon-box {
            width: 48px;
            height: 48px;
            border-radius: 8px;
            background-color: #fff1f0;
            color: var(--brand-accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.35rem;
            margin-bottom: 1.25rem;
        }

        /* 资讯与内容列表 */
        .news-item {
            display: block;
            text-decoration: none;
            color: inherit;
            padding: 1.25rem;
            border-radius: var(--card-radius);
            background: #ffffff;
            border: 1px solid var(--border-color);
            margin-bottom: 1rem;
            transition: var(--transition-smooth);
        }
        .news-item:hover {
            border-color: var(--brand-accent);
            transform: translateX(4px);
        }

        /* 前后对比与结果展示 */
        .compare-box {
            background: #ffffff;
            border-radius: var(--card-radius);
            border: 1px solid var(--border-color);
            overflow: hidden;
        }
        .compare-header-before {
            background: #f1f5f9;
            color: #475569;
            padding: 1rem 1.5rem;
            font-weight: 700;
        }
        .compare-header-after {
            background: #fff1f0;
            color: var(--brand-accent);
            padding: 1rem 1.5rem;
            font-weight: 700;
        }

        /* 客户案例与指标条 */
        .metric-card {
            background: #0f172a;
            color: #ffffff;
            border-radius: var(--card-radius);
            padding: 2rem 1.5rem;
            text-align: center;
        }
        .metric-card .number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--brand-accent);
            line-height: 1.1;
            margin-bottom: 0.5rem;
        }

        /* 页脚 */
        .crow-footer {
            background-color: #0a0d10;
            color: #94a3b8;
            padding: 4rem 0 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .crow-footer h5 {
            color: #ffffff;
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 1.25rem;
        }
        .crow-footer ul {
            list-style: none;
            padding-left: 0;
            margin-bottom: 0;
        }
        .crow-footer ul li {
            margin-bottom: 0.65rem;
        }
        .crow-footer ul li a {
            color: #94a3b8;
            text-decoration: none;
            transition: var(--transition-smooth);
        }
        .crow-footer ul li a:hover {
            color: #ffffff;
        }
        .footer-bottom {
            margin-top: 3.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            font-size: 0.85rem;
        }

        @media (max-width: 768px) {
            .section-title { font-size: 1.6rem; }
            .hero-section { padding: 3.5rem 0; }
        }

/* roulang page: category1 */
:root {
        --brand-primary: #12161a;
        --brand-accent: #e53935;
        --brand-accent-hover: #c62828;
        --brand-subtle: #242b35;
        --brand-light: #f8f9fa;
        --brand-dark: #0a0d10;
        --text-main: #1e293b;
        --text-muted: #64748b;
        --border-color: #e2e8f0;
        --card-radius: 12px;
        --transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    body {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        color: var(--text-main);
        background-color: #ffffff;
        line-height: 1.65;
        overflow-x: hidden;
    }
    .crow-navbar {
        background-color: rgba(10, 13, 16, 0.95);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        transition: var(--transition-smooth);
    }
    .crow-navbar .navbar-brand {
        font-size: 1.45rem;
        font-weight: 800;
        color: #ffffff;
        letter-spacing: -0.5px;
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .crow-navbar .navbar-brand span {
        color: var(--brand-accent);
    }
    .crow-navbar .nav-link {
        color: #cbd5e1;
        font-weight: 500;
        padding: 0.5rem 1.1rem;
        transition: var(--transition-smooth);
    }
    .crow-navbar .nav-link:hover,
    .crow-navbar .nav-link.active {
        color: #ffffff;
        background-color: rgba(255, 255, 255, 0.06);
        border-radius: 6px;
    }
    .btn-brand {
        background-color: var(--brand-accent);
        color: #ffffff;
        font-weight: 600;
        border-radius: 6px;
        padding: 0.65rem 1.4rem;
        border: 1px solid var(--brand-accent);
        transition: var(--transition-smooth);
    }
    .btn-brand:hover {
        background-color: var(--brand-accent-hover);
        border-color: var(--brand-accent-hover);
        color: #ffffff;
        transform: translateY(-2px);
        box-shadow: 0 8px 20px rgba(229, 57, 53, 0.25);
    }
    .btn-outline-brand {
        background-color: transparent;
        color: #ffffff;
        font-weight: 600;
        border-radius: 6px;
        padding: 0.65rem 1.4rem;
        border: 1px solid rgba(255, 255, 255, 0.25);
        transition: var(--transition-smooth);
    }
    .btn-outline-brand:hover {
        background-color: rgba(255, 255, 255, 0.1);
        color: #ffffff;
        border-color: #ffffff;
    }
    .crow-badge {
        display: inline-block;
        padding: 0.35rem 0.75rem;
        font-size: 0.8rem;
        font-weight: 700;
        letter-spacing: 0.5px;
        border-radius: 4px;
        background-color: rgba(229, 57, 53, 0.12);
        color: var(--brand-accent);
        margin-bottom: 0.75rem;
    }
    .hero-whitepaper-section {
        background: linear-gradient(135deg, #0a0d10 0%, #161c24 100%);
        color: #ffffff;
        padding: 5rem 0 4.5rem;
        position: relative;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .whitepaper-cover-card {
        background: linear-gradient(145deg, #1e2530, #141920);
        border: 1px solid rgba(255, 255, 255, 0.15);
        border-radius: var(--card-radius);
        padding: 2.2rem;
        box-shadow: 0 20px 40px rgba(0,0,0,0.4);
        position: relative;
        overflow: hidden;
    }
    .whitepaper-cover-card::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 6px;
        height: 100%;
        background: var(--brand-accent);
    }
    .whitepaper-form-card {
        background: rgba(255, 255, 255, 0.04);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: var(--card-radius);
        padding: 2rem;
        backdrop-filter: blur(10px);
    }
    .crow-section {
        padding: 4.5rem 0;
        position: relative;
    }
    .crow-section-alt {
        background-color: #f8fafc;
    }
    .section-header {
        margin-bottom: 3rem;
    }
    .section-title {
        font-size: 2rem;
        font-weight: 800;
        letter-spacing: -0.5px;
        margin-bottom: 0.75rem;
        color: #0f172a;
    }
    .section-desc {
        color: var(--text-muted);
        max-width: 760px;
        font-size: 1.05rem;
    }
    .crow-card {
        background: #ffffff;
        border: 1px solid var(--border-color);
        border-radius: var(--card-radius);
        padding: 1.75rem;
        height: 100%;
        transition: var(--transition-smooth);
    }
    .crow-card:hover {
        border-color: #cbd5e1;
        transform: translateY(-4px);
        box-shadow: 0 12px 28px rgba(0, 0, 0, 0.05);
    }
    .crow-icon-box {
        width: 48px;
        height: 48px;
        border-radius: 8px;
        background-color: #fff1f0;
        color: var(--brand-accent);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.35rem;
        margin-bottom: 1.25rem;
    }
    .matrix-strip-card {
        background: #ffffff;
        border: 1px solid var(--border-color);
        border-radius: var(--card-radius);
        padding: 1.75rem;
        margin-bottom: 1.5rem;
        transition: var(--transition-smooth);
    }
    .matrix-strip-card:hover {
        border-color: var(--brand-accent);
        box-shadow: 0 8px 24px rgba(0,0,0,0.06);
    }
    .matrix-num {
        font-size: 2rem;
        font-weight: 800;
        color: rgba(229, 57, 53, 0.2);
        line-height: 1;
    }
    .spec-table-card {
        background: #ffffff;
        border: 1px solid var(--border-color);
        border-radius: var(--card-radius);
        overflow: hidden;
    }
    .spec-table-card th {
        background: #0f172a;
        color: #ffffff;
        padding: 1.2rem 1.5rem;
        font-weight: 600;
        border: none;
    }
    .spec-table-card td {
        padding: 1.2rem 1.5rem;
        border-bottom: 1px solid var(--border-color);
        vertical-align: middle;
    }
    .spec-table-card tr:last-child td {
        border-bottom: none;
    }
    .case-banner-card {
        background: #0f172a;
        color: #ffffff;
        border-radius: var(--card-radius);
        padding: 2.5rem;
    }
    .custom-accordion .accordion-item {
        border: 1px solid var(--border-color);
        border-radius: 8px !important;
        margin-bottom: 1rem;
        overflow: hidden;
    }
    .custom-accordion .accordion-button {
        font-weight: 600;
        color: var(--text-main);
        padding: 1.25rem 1.5rem;
        background-color: #ffffff;
    }
    .custom-accordion .accordion-button:not(.collapsed) {
        color: var(--brand-accent);
        background-color: #fff1f0;
        box-shadow: none;
    }
    .custom-accordion .accordion-button:focus {
        box-shadow: none;
        border-color: rgba(229, 57, 53, 0.2);
    }
    .crow-footer {
        background-color: #07090b;
        color: #94a3b8;
        padding: 4.5rem 0 2rem;
        border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .crow-footer h5 {
        color: #ffffff;
        font-size: 1.05rem;
        font-weight: 700;
        margin-bottom: 1.25rem;
    }
    .crow-footer ul {
        list-style: none;
        padding-left: 0;
        margin-bottom: 0;
    }
    .crow-footer ul li {
        margin-bottom: 0.65rem;
    }
    .crow-footer ul li a {
        color: #94a3b8;
        text-decoration: none;
        transition: var(--transition-smooth);
    }
    .crow-footer ul li a:hover {
        color: #ffffff;
        padding-left: 4px;
    }
    .footer-bottom {
        margin-top: 3.5rem;
        padding-top: 1.5rem;
        border-top: 1px solid rgba(255, 255, 255, 0.08);
    }