/* roulang page: index */
/* ============ 设计变量 ============ */
        :root {
            --primary: #3D7FB4;
            --primary-dark: #2B5F8A;
            --primary-tint: #DCEBF5;
            --accent: #E4A13E;
            --accent-hover: #CC8B2A;
            --accent-disabled: #F0D8A8;
            --bg-body: #F7FAFC;
            --bg-alt: #EDF3F8;
            --bg-card: #FFFFFF;
            --text-strong: #21303F;
            --text-body: #46596B;
            --text-weak: #889BA8;
            --nav-bg: #1B2A38;
            --nav-link: #E7EDF3;
            --nav-link-hover: #F0C060;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-input: 8px;
            --radius-badge: 999px;
            --shadow-card: 0 4px 20px rgba(40, 80, 100, 0.08);
            --shadow-card-hover: 0 10px 32px rgba(40, 80, 100, 0.14);
            --border-line: 1px solid rgba(40, 80, 100, 0.08);
            --section-padding: 90px 0;
        }

        /* ============ Reset & Base ============ */
        *, *::before, *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            font-size: 1rem;
            line-height: 1.6;
            color: var(--text-body);
            background-color: var(--bg-body);
            -webkit-font-smoothing: antialiased;
        }
        a {
            text-decoration: none;
            color: var(--primary);
            transition: color .2s ease;
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
        }
        ul {
            margin: 0;
            padding: 0;
            list-style: none;
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        .img-cover {
            width: 100%;
            object-fit: cover;
            display: block;
        }
        .section {
            padding: var(--section-padding);
        }
        .section-head {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
        }
        .section-tag {
            display: inline-block;
            padding: 4px 16px;
            border-radius: var(--radius-badge);
            background: var(--primary-tint);
            color: var(--primary-dark);
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 14px;
        }
        .section-head h2 {
            font-size: clamp(1.6rem, 3vw, 2.2rem);
            font-weight: 700;
            color: var(--text-strong);
            line-height: 1.3;
            margin-bottom: 12px;
        }
        .section-head p {
            font-size: 1rem;
            color: var(--text-body);
            line-height: 1.7;
        }

        /* ============ 按钮 ============ */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0 24px;
            height: 48px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 0.95rem;
            border: 1px solid transparent;
            transition: all .25s ease;
            cursor: pointer;
            line-height: 1.2;
        }
        .btn-accent {
            background: var(--accent);
            color: #1B2A38;
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
            color: #1B2A38;
            box-shadow: 0 4px 12px rgba(204, 139, 42, 0.25);
        }
        .btn-accent:active {
            background: #B5781F;
            border-color: #B5781F;
            transform: scale(0.98);
        }
        .btn-outline-primary {
            background: #fff;
            color: var(--primary);
            border: 1px solid var(--primary);
        }
        .btn-outline-primary:hover {
            background: var(--primary-tint);
            color: var(--primary-dark);
            border-color: var(--primary-dark);
        }
        .btn-outline-primary:active {
            background: var(--primary);
            color: #fff;
            transform: scale(0.98);
        }
        .btn-lg {
            height: 52px;
            padding: 0 32px;
            font-size: 1rem;
        }

        /* ============ 导航栏 ============ */
        .site-header {
            background: var(--nav-bg);
            min-height: 76px;
            position: sticky;
            top: 0;
            z-index: 1050;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
        }
        .site-header .navbar {
            padding: 0;
            min-height: 76px;
        }
        .site-header .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #FFFFFF;
            font-weight: 700;
            font-size: 1.4rem;
            line-height: 1;
            padding: 0;
        }
        .site-header .navbar-brand:hover {
            color: #FFFFFF;
        }
        .site-header .navbar-brand svg {
            flex-shrink: 0;
        }
        .navbar-nav {
            gap: 4px;
            align-items: center;
        }
        .navbar-nav .nav-link {
            color: var(--nav-link);
            font-weight: 400;
            font-size: 0.95rem;
            padding: 8px 14px;
            position: relative;
            letter-spacing: 0.3px;
        }
        .navbar-nav .nav-link::after {
            content: "";
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 0;
            height: 2px;
            background: var(--nav-link-hover);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform .3s ease;
        }
        .navbar-nav .nav-link:hover {
            color: var(--nav-link-hover);
        }
        .navbar-nav .nav-link:hover::after {
            transform: scaleX(1);
        }
        .navbar-nav .nav-link.active {
            color: var(--nav-link-hover);
            font-weight: 500;
        }
        .navbar-nav .nav-link.active::after {
            transform: scaleX(1);
        }
        .navbar-nav .btn-cta {
            margin-left: 16px;
            background: var(--accent);
            color: #1B2A38;
            padding: 8px 20px;
            border-radius: 6px;
            font-weight: 600;
            font-size: 0.9rem;
            border: none;
            line-height: 1.4;
            height: auto;
            transition: all .25s ease;
        }
        .navbar-nav .btn-cta:hover {
            background: var(--accent-hover);
            color: #1B2A38;
            box-shadow: 0 2px 8px rgba(228, 161, 62, 0.3);
        }
        .navbar-toggler {
            border: 1px solid rgba(255, 255, 255, 0.3);
            padding: 6px 10px;
        }
        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(228, 161, 62, 0.3);
        }
        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3e%3cpath stroke='rgba(231,237,243,0.9)' stroke-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* ============ Hero ============ */
        .hero-section {
            position: relative;
            background: #F7FAFC;
            padding: 72px 0 80px;
            overflow: hidden;
        }
        .hero-section::before {
            content: "";
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.jpg') center center / cover no-repeat;
            opacity: 0.06;
            z-index: 0;
        }
        .hero-section .container {
            position: relative;
            z-index: 1;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            border: 1px solid rgba(61, 127, 180, 0.15);
            border-radius: var(--radius-badge);
            padding: 6px 18px;
            font-size: 0.85rem;
            color: var(--primary-dark);
            font-weight: 500;
            margin-bottom: 20px;
            box-shadow: var(--shadow-card);
        }
        .hero-badge i {
            color: var(--accent);
        }
        .hero-title {
            font-size: clamp(2.2rem, 5vw, 3.6rem);
            font-weight: 800;
            line-height: 1.2;
            color: var(--text-strong);
            margin-bottom: 18px;
            letter-spacing: -0.5px;
        }
        .hero-subtitle {
            font-size: 1.15rem;
            line-height: 1.8;
            color: #46596B;
            max-width: 520px;
            margin-bottom: 28px;
        }
        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-bottom: 28px;
        }
        .hero-invite-card {
            background: #fff;
            border-radius: var(--radius-card);
            border: var(--border-line);
            box-shadow: var(--shadow-card);
            padding: 28px;
            max-width: 440px;
        }
        .invite-card-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-strong);
            margin-bottom: 6px;
        }
        .invite-card-sub {
            font-size: 0.9rem;
            color: var(--text-weak);
            margin-bottom: 16px;
        }
        .invite-rewards {
            display: flex;
            gap: 12px;
            margin-bottom: 20px;
        }
        .invite-reward-item {
            flex: 1;
            background: #F7FAFC;
            border-radius: 8px;
            padding: 12px 8px;
            text-align: center;
        }
        .invite-reward-item .reward-num {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary);
            display: block;
        }
        .invite-reward-item .reward-label {
            font-size: 0.75rem;
            color: var(--text-weak);
        }
        .progress-info {
            display: flex;
            justify-content: space-between;
            font-size: 0.85rem;
            color: var(--text-body);
            margin-bottom: 6px;
        }
        .progress-count {
            font-weight: 600;
            color: var(--primary-dark);
        }
        .progress-bar-wrap {
            height: 8px;
            background: #E9EFF4;
            border-radius: 999px;
            overflow: hidden;
            margin-bottom: 12px;
        }
        .progress-bar-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 999px;
            transition: width .6s ease;
        }
        .progress-hint {
            font-size: 0.8rem;
            color: var(--text-weak);
            margin: 0;
        }
        .hero-media {
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card-hover);
            position: relative;
        }
        .hero-media img {
            aspect-ratio: 4/3;
            width: 100%;
            object-fit: cover;
        }
        .hero-media-tag {
            position: absolute;
            bottom: 16px;
            left: 16px;
            background: rgba(27, 42, 56, 0.85);
            color: #fff;
            padding: 6px 16px;
            border-radius: 999px;
            font-size: 0.8rem;
            backdrop-filter: blur(4px);
        }

        /* ============ 会员权益 / 服务区 ============ */
        .services-section {
            background: #fff;
        }
        .feature-card {
            height: 100%;
            border-radius: var(--radius-card);
            border: var(--border-line);
            box-shadow: var(--shadow-card);
            background: var(--bg-card);
            padding: 32px 28px;
            transition: all .3s ease;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
            border-color: var(--primary-tint);
        }
        /* 卡片1：顶部居中大图标 */
        .card-center-icon {
            text-align: center;
        }
        .card-center-icon .feature-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: var(--primary-tint);
            margin: 0 auto 20px;
        }
        .card-center-icon .feature-icon i {
            font-size: 28px;
            color: var(--primary);
        }
        /* 卡片2：左侧圆形图标 */
        .card-horizontal {
            display: flex;
            align-items: flex-start;
            gap: 18px;
            text-align: left;
        }
        .card-horizontal .horiz-icon {
            flex-shrink: 0;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: rgba(228, 161, 62, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .card-horizontal .horiz-icon i {
            font-size: 24px;
            color: var(--accent-hover);
        }
        /* 卡片3：顶部图标 + 标题 + 正文 + 底部链接 */
        .card-bottom-link {
            text-align: left;
        }
        .card-bottom-link .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: 10px;
            background: #EDF3F8;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
        }
        .card-bottom-link .feature-icon i {
            font-size: 22px;
            color: var(--primary);
        }
        .feature-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-strong);
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-body);
            line-height: 1.7;
            margin-bottom: 0;
            flex-grow: 1;
        }
        .card-divider {
            height: 1px;
            background: rgba(40, 80, 100, 0.06);
            margin: 18px 0 14px;
        }
        .link-more {
            color: var(--accent-hover);
            font-size: 0.9rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap .2s ease;
        }
        .link-more:hover {
            color: var(--accent-hover);
            gap: 8px;
        }

        /* ============ 优势数据 ============ */
        .stats-section {
            background: linear-gradient(180deg, #EDF3F8 0%, #FFFFFF 100%);
            padding: 64px 0;
        }
        .stats-section .stat-num {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
            text-align: center;
        }
        .stats-section .stat-label {
            font-size: 0.875rem;
            color: #889BA8;
            text-align: center;
            margin-top: 8px;
        }

        /* ============ 价格对比 ============ */
        .pricing-section {
            background: #F7FAFC;
        }
        .pricing-card {
            border-radius: var(--radius-card);
            border: var(--border-line);
            background: #fff;
            box-shadow: var(--shadow-card);
            padding: 36px 32px;
            height: 100%;
            text-align: center;
            transition: all .3s ease;
            position: relative;
        }
        .pricing-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
        }
        .pricing-card.featured {
            border: 1px solid var(--accent);
            padding-top: 44px;
            box-shadow: 0 8px 30px rgba(228, 161, 62, 0.15);
        }
        .pricing-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-strong);
            margin-bottom: 14px;
        }
        .price {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--text-strong);
            line-height: 1.2;
            margin-bottom: 20px;
        }
        .price span {
            font-size: 0.95rem;
            font-weight: 400;
            color: var(--text-weak);
        }
        .pricing-card ul {
            text-align: left;
            margin-bottom: 24px;
            padding: 0;
        }
        .pricing-card ul li {
            padding: 7px 0 7px 24px;
            position: relative;
            font-size: 0.9rem;
            color: var(--text-body);
            line-height: 1.7;
        }
        .pricing-card ul li::before {
            content: "\F26B";
            font-family: 'bootstrap-icons';
            position: absolute;
            left: 0;
            top: 7px;
            color: var(--primary);
            font-size: 0.9rem;
        }
        .featured-tag {
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--accent);
            color: #1B2A38;
            font-size: 0.8rem;
            font-weight: 700;
            padding: 4px 20px;
            border-radius: 999px;
            white-space: nowrap;
            box-shadow: 0 2px 8px rgba(228, 161, 62, 0.3);
        }

        /* ============ 资讯区 ============ */
        .news-section {
            background: #fff;
        }
        .news-list-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 16px 0;
            border-bottom: 1px solid rgba(40, 80, 100, 0.06);
            transition: background .2s ease;
        }
        .news-list-item:last-child {
            border-bottom: none;
        }
        .news-date {
            flex-shrink: 0;
            background: #F0F5F9;
            color: var(--primary-dark);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            width: 72px;
            text-align: center;
        }
        .news-list-item a {
            color: var(--text-strong);
            font-size: 0.98rem;
            line-height: 1.5;
            flex: 1;
        }
        .news-list-item a:hover {
            color: var(--primary);
        }
        .news-list-item .news-arrow {
            color: var(--text-weak);
            font-size: 0.9rem;
            transition: transform .2s ease;
        }
        .news-list-item:hover .news-arrow {
            transform: translateX(4px);
            color: var(--accent-hover);
        }
        .sidebar-card {
            background: #F7FAFC;
            border-radius: var(--radius-card);
            padding: 28px;
            border: var(--border-line);
            margin-bottom: 24px;
        }
        .sidebar-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-strong);
            margin-bottom: 16px;
        }
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 8px;
        }
        .tag-cloud .badge {
            background: #fff;
            border: 1px solid rgba(40, 80, 100, 0.1);
            color: var(--text-body);
            font-size: 0.8rem;
            font-weight: 400;
            padding: 6px 14px;
            border-radius: 999px;
            transition: all .2s ease;
        }
        .tag-cloud .badge:hover {
            background: var(--primary-tint);
            border-color: var(--primary);
            color: var(--primary-dark);
        }
        .hot-list {
            counter-reset: hot;
        }
        .hot-list li {
            counter-increment: hot;
            padding: 10px 0;
            border-bottom: 1px solid rgba(40, 80, 100, 0.06);
            font-size: 0.9rem;
            color: var(--text-body);
            display: flex;
            align-items: baseline;
            gap: 10px;
        }
        .hot-list li:last-child {
            border-bottom: none;
        }
        .hot-list li::before {
            content: counter(hot, decimal-leading-zero);
            font-weight: 700;
            color: var(--accent-hover);
            font-size: 0.85rem;
            flex-shrink: 0;
        }

        /* ============ 开通入口 CTA ============ */
        .join-section {
            background: #F7FAFC;
        }
        .join-wrap {
            background: #fff;
            border-radius: 20px;
            border: var(--border-line);
            box-shadow: var(--shadow-card);
            padding: 56px 48px;
        }
        .join-title {
            font-size: clamp(1.6rem, 3vw, 2.1rem);
            font-weight: 700;
            color: var(--text-strong);
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .join-desc {
            font-size: 1rem;
            color: var(--text-body);
            line-height: 1.8;
            margin-bottom: 24px;
        }
        .join-info-item {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 12px;
            font-size: 0.92rem;
            color: var(--text-body);
        }
        .join-info-item i {
            color: var(--accent-hover);
            font-size: 1.1rem;
        }
        .join-form .form-label {
            font-size: 0.9rem;
            color: var(--text-body);
            font-weight: 500;
            margin-bottom: 6px;
        }
        .join-form .form-control,
        .join-form .form-select {
            height: 46px;
            border-radius: var(--radius-input);
            border: 1px solid rgba(40, 80, 100, 0.15);
            background: #fff;
            color: var(--text-strong);
            font-size: 0.95rem;
            padding: 0 14px;
            transition: all .2s ease;
        }
        .join-form .form-control:focus,
        .join-form .form-select:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 4px rgba(228, 161, 62, 0.12);
            outline: none;
        }
        .join-form textarea.form-control {
            height: auto;
            padding: 12px 14px;
            resize: vertical;
        }
        .join-form .form-control::placeholder {
            color: #A0B0BC;
        }
        .btn-submit {
            width: 100%;
            min-width: 200px;
            height: 48px;
            margin-top: 8px;
        }

        /* ============ FAQ ============ */
        .faq-section {
            background: #fff;
        }
        .faq-guide p {
            font-size: 0.95rem;
            color: var(--text-body);
            line-height: 1.7;
        }
        .faq-accordion .accordion-item {
            border: 1px solid rgba(40, 80, 100, 0.12);
            border-radius: 8px;
            margin-bottom: 12px;
            overflow: hidden;
            box-shadow: none;
        }
        .faq-accordion .accordion-button {
            background: #fff;
            color: var(--text-strong);
            font-weight: 600;
            font-size: 0.98rem;
            padding: 16px 20px;
            border: none;
            box-shadow: none;
        }
        .faq-accordion .accordion-button:not(.collapsed) {
            color: var(--primary);
            background: #fff;
            box-shadow: none;
        }
        .faq-accordion .accordion-button:focus {
            box-shadow: none;
            border-color: transparent;
        }
        .faq-accordion .accordion-button::after {
            background-image: url("data:image/svg+xml,%3csvg viewBox='0 0 16 16' fill='%2321303F' xmlns='http://www.w3.org/2000/svg'%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");
            transition: transform .3s ease;
        }
        .faq-accordion .accordion-button:not(.collapsed)::after {
            background-image: url("data:image/svg+xml,%3csvg viewBox='0 0 16 16' fill='%233D7FB4' xmlns='http://www.w3.org/2000/svg'%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");
        }
        .faq-accordion .accordion-body {
            background: #F7FAFC;
            border-radius: 4px;
            padding: 16px;
            font-size: 0.9rem;
            color: var(--text-body);
            line-height: 1.8;
        }

        /* ============ 页脚 ============ */
        .site-footer {
            background: var(--nav-bg);
            color: #C6D2DC;
            padding-top: 64px;
        }
        .site-footer h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 20px;
        }
        .site-footer p,
        .site-footer li {
            font-size: 0.9rem;
            color: #C6D2DC;
            line-height: 1.8;
        }
        .site-footer a {
            color: #C6D2DC;
            transition: color .2s ease;
        }
        .site-footer a:hover {
            color: #F0C060;
        }
        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-about {
            color: #5A6B7A;
            font-size: 0.875rem;
            line-height: 1.7;
        }
        .site-footer .footer-links li {
            margin-bottom: 8px;
        }
        .site-footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            margin-top: 48px;
            text-align: center;
            font-size: 0.8125rem;
            color: #5A6B7A;
        }

        /* ============ 响应式 ============ */
        @media (max-width: 991.98px) {
            .navbar-nav {
                gap: 0;
                padding: 12px 0;
                align-items: flex-start;
            }
            .navbar-nav .nav-link {
                padding: 10px 14px;
                width: 100%;
            }
            .navbar-nav .nav-link::after {
                display: none;
            }
            .navbar-nav .btn-cta {
                margin: 12px 14px 8px;
                width: calc(100% - 28px);
                justify-content: center;
            }
            .hero-section {
                padding: 56px 0 48px;
            }
            .hero-title {
                font-size: clamp(1.9rem, 4vw, 2.4rem);
            }
            .hero-media {
                margin-top: 32px;
            }
            .join-wrap {
                padding: 32px 24px;
            }
        }
        @media (max-width: 767.98px) {
            .section {
                padding: 48px 0;
            }
            .section-head {
                margin-bottom: 32px;
            }
            .hero-buttons .btn {
                width: 100%;
            }
            .stats-section .stat-num {
                font-size: 2rem;
            }
            .pricing-card {
                margin-bottom: 20px;
            }
            .sidebar-card {
                margin-top: 24px;
            }
            .join-wrap {
                padding: 24px 16px;
            }
        }
        @media (max-width: 575.98px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .hero-title {
                font-size: 1.7rem;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .invite-reward-item .reward-num {
                font-size: 1rem;
            }
            .news-list-item {
                flex-wrap: wrap;
                gap: 6px;
            }
            .news-date {
                width: auto;
            }
        }

/* roulang page: category1 */
:root {
  --primary: #3D7FB4;
  --primary-dark: #2B5F8A;
  --primary-tint: #DCEBF5;
  --accent: #E4A13E;
  --accent-hover: #CC8B2A;
  --accent-disabled: #F0D8A8;
  --bg-body: #F7FAFC;
  --bg-alt: #EDF3F8;
  --bg-card: #FFFFFF;
  --text-strong: #21303F;
  --text-body: #46596B;
  --text-weak: #889BA8;
  --nav-bg: #1B2A38;
  --nav-link: #E7EDF3;
  --nav-link-hover: #F0C060;
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-input: 8px;
  --radius-badge: 999px;
  --shadow-card: 0 4px 20px rgba(40, 80, 100, 0.08);
  --shadow-card-hover: 0 10px 32px rgba(40, 80, 100, 0.14);
  --border-line: 1px solid rgba(40, 80, 100, 0.08);
  --section-padding: 90px 0;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-body);
  background-color: var(--bg-body);
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: var(--primary);
  transition: color .2s ease;
}

a:hover {
  color: var(--primary-dark);
}

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

.img-cover {
  width: 100%;
  object-fit: cover;
  display: block;
}

.section {
  padding: var(--section-padding);
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-block;
  padding: 4px 16px;
  border-radius: var(--radius-badge);
  background: var(--primary-tint);
  color: var(--primary-dark);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 14px;
}

.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--text-strong);
  line-height: 1.3;
  margin-bottom: 12px;
}

.section-head p {
  font-size: 1rem;
  color: var(--text-body);
  line-height: 1.7;
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  height: 48px;
  border-radius: var(--radius-btn);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: all .25s ease;
  cursor: pointer;
  line-height: 1.2;
}

.btn-accent {
  background: var(--accent);
  color: #1B2A38;
  border-color: var(--accent);
}

.btn-accent:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #1B2A38;
  box-shadow: 0 4px 12px rgba(204, 139, 42, 0.25);
}

.btn-accent:active {
  background: #B5781F;
  border-color: #B5781F;
  transform: scale(0.98);
}

.btn-outline-primary {
  background: #fff;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn-outline-primary:hover {
  background: var(--primary-tint);
  color: var(--primary-dark);
  border-color: var(--primary-dark);
}

.btn-outline-primary:active {
  background: var(--primary);
  color: #fff;
  transform: scale(0.98);
}

.btn-lg {
  height: 52px;
  padding: 0 32px;
  font-size: 1rem;
}

/* ============ 导航栏 ============ */
.site-header {
  background: var(--nav-bg);
  min-height: 76px;
  position: sticky;
  top: 0;
  z-index: 1050;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.site-header .navbar {
  padding: 0;
  min-height: 76px;
}

.site-header .navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #FFFFFF;
  font-weight: 700;
  font-size: 1.4rem;
  line-height: 1;
  padding: 0;
}

.site-header .navbar-brand:hover {
  color: #FFFFFF;
}

.site-header .navbar-brand svg {
  flex-shrink: 0;
}

.navbar-nav {
  gap: 4px;
  align-items: center;
}

.navbar-nav .nav-link {
  color: var(--nav-link);
  font-weight: 400;
  font-size: 0.95rem;
  padding: 8px 14px;
  position: relative;
  letter-spacing: 0.3px;
}

.navbar-nav .nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 0;
  height: 2px;
  background: var(--nav-link-hover);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s ease;
}

.navbar-nav .nav-link:hover {
  color: var(--nav-link-hover);
}

.navbar-nav .nav-link:hover::after {
  transform: scaleX(1);
}

.navbar-nav .nav-link.active {
  color: var(--nav-link-hover);
  font-weight: 500;
}

.navbar-nav .nav-link.active::after {
  transform: scaleX(1);
}

.navbar-nav .btn-cta {
  background: var(--accent) !important;
  color: #1B2A38 !important;
  border: none;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 6px;
  padding: 8px 20px;
  height: auto;
  margin-left: 8px;
  transition: all .25s ease;
}

.navbar-nav .btn-cta:hover {
  background: var(--accent-hover) !important;
  color: #1B2A38 !important;
  box-shadow: 0 4px 12px rgba(204, 139, 42, 0.25);
}

.navbar-toggler {
  border: 1px solid rgba(255, 255, 255, 0.5);
  padding: 6px 10px;
}

.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3e%3cpath stroke='rgba(255, 255, 255, 0.8)' stroke-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
}

/* ============ 页脚 ============ */
.site-footer {
  background: var(--nav-bg);
  color: #C6D2DC;
  padding: 60px 0 0;
  margin-top: 60px;
}

.site-footer .footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #FFFFFF;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.site-footer .footer-brand svg {
  flex-shrink: 0;
}

.site-footer .footer-about {
  color: #5A6B7A;
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 260px;
  margin-bottom: 0;
}

.site-footer h4 {
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.site-footer .footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer .footer-links li {
  margin-bottom: 10px;
  font-size: 0.9rem;
  color: #C6D2DC;
}

.site-footer .footer-links a {
  color: #C6D2DC;
  transition: color .2s ease;
}

.site-footer .footer-links a:hover {
  color: var(--nav-link-hover);
}

.site-footer .footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 0;
  margin-top: 40px;
}

.site-footer .footer-bottom p {
  margin: 0;
  text-align: center;
  font-size: 0.8125rem;
  color: #5A6B7A;
}

/* ============ 分类页样式 ============ */
.page-hero {
  padding: 80px 0 60px;
  position: relative;
  background: linear-gradient(135deg, #EDF3F8 0%, #F7FAFC 100%);
  border-bottom: 1px solid rgba(40, 80, 100, 0.06);
}

.page-hero .page-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--text-strong);
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.page-hero .page-title span {
  color: var(--primary);
}

.page-hero .page-subtitle {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-body);
  max-width: 680px;
  margin-bottom: 0;
}

.hero-divider {
  width: 64px;
  height: 3px;
  background: var(--accent);
  border-radius: 3px;
  margin-top: 24px;
}

/* 标签筛选 */
.filter-bar {
  padding: 0 0 24px;
  margin-top: -12px;
}

.filter-bar .filter-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.filter-label {
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--radius-badge);
  background: var(--accent);
  color: #1B2A38;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: default;
  border: 1px solid var(--accent);
}

.filter-item {
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--radius-badge);
  background: #fff;
  border: 1px solid rgba(40, 80, 100, 0.15);
  color: var(--text-body);
  font-size: 0.85rem;
  cursor: default;
  transition: all .2s ease;
}

/* 内容卡片 */
.video-section {
  padding: 20px 0 60px;
}

.video-grid .card {
  border: var(--border-line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  background: var(--bg-card);
  transition: all .3s ease;
  overflow: hidden;
  height: 100%;
}

.video-grid .card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--primary-tint);
}

.video-grid .card-img-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
}

.video-grid .card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}

.video-grid .card:hover .card-img-wrap img {
  transform: scale(1.04);
}

.video-grid .card-img-wrap .play-badge {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: rgba(27, 42, 56, 0.85);
  color: #fff;
  font-size: 0.8rem;
  padding: 4px 12px;
  border-radius: var(--radius-badge);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.video-grid .card-body {
  padding: 20px;
}

.video-grid .card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-strong);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-grid .card-text {
  font-size: 0.9rem;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-grid .card-link {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.video-grid .card-link:hover {
  color: var(--accent-hover);
}

.video-grid .card-link i {
  font-size: 0.85rem;
  transition: transform .2s ease;
}

.video-grid .card-link:hover i {
  transform: translateX(4px);
}

/* 分页器 */
.pagination-wrap {
  padding: 40px 0 20px;
  text-align: center;
}

.pagination {
  justify-content: center;
  gap: 6px;
}

.pagination .page-link {
  border: 1px solid rgba(40, 80, 100, 0.12);
  border-radius: 8px;
  color: var(--text-body);
  font-size: 0.9rem;
  padding: 8px 14px;
  background: #fff;
  transition: all .2s ease;
  min-width: 40px;
  text-align: center;
}

.pagination .page-link:hover {
  background: var(--primary-tint);
  color: var(--primary-dark);
  border-color: var(--primary);
}

.pagination .page-item.active .page-link {
  background: var(--accent);
  border-color: var(--accent);
  color: #1B2A38;
  font-weight: 600;
}

.pagination .page-item.disabled .page-link {
  color: var(--text-weak);
  background: rgba(255, 255, 255, 0.6);
  border-color: rgba(40, 80, 100, 0.05);
  pointer-events: none;
  opacity: 0.6;
}

/* CTA 区块 */
.cta-section {
  padding: 70px 0;
  background: linear-gradient(135deg, #EDF3F8 0%, #F7FAFC 100%);
  border-top: 1px solid rgba(40, 80, 100, 0.06);
  border-bottom: 1px solid rgba(40, 80, 100, 0.06);
}

.cta-card {
  background: var(--nav-bg);
  border-radius: 16px;
  padding: 48px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(27, 42, 56, 0.2);
}

.cta-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--primary), var(--accent));
  opacity: 0.8;
}

.cta-card h2 {
  color: #fff;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 12px;
}

.cta-card p {
  color: #C6D2DC;
  font-size: 1rem;
  line-height: 1.7;
  max-width: 520px;
  margin: 0 auto 28px;
}

.cta-card .btn-accent {
  background: var(--accent);
}

.cta-card .btn-outline-light {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.5);
  color: #fff;
}

.cta-card .btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent);
  color: var(--nav-link-hover);
}

/* 响应式 */
@media (max-width: 992px) {
  .site-header .navbar-collapse {
    background: var(--nav-bg);
    padding: 16px 8px;
    border-radius: 0 0 12px 12px;
  }

  .site-header .navbar-nav {
    gap: 0;
    align-items: flex-start;
  }

  .site-header .navbar-nav .nav-link {
    padding: 10px 14px;
    color: var(--nav-link);
  }

  .site-header .navbar-nav .btn-cta {
    margin-left: 14px;
    margin-top: 8px;
    height: 42px;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 0.95rem;
  }

  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .section {
    --section-padding: 60px 0;
  }

  .page-hero {
    padding: 48px 0 40px;
  }

  .page-hero .page-subtitle {
    font-size: 1rem;
  }

  .video-section {
    padding: 0 0 40px;
  }
}

@media (max-width: 576px) {
  .container {
    padding-left: 14px;
    padding-right: 14px;
  }

  .cta-card {
    padding: 32px 24px;
  }

  .filter-wrap {
    justify-content: flex-start;
  }

  .pagination .page-link {
    padding: 8px 12px;
    min-width: 36px;
  }
}

/* 焦点访问性 */
a:focus-visible,
button:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.form-control:focus-visible,
input:focus-visible,
textarea:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(228, 161, 62, 0.12);
  outline: none;
}

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}