/* roulang page: index */
:root {
    --primary: #2D74B2;
    --primary-light: #E8F1F9;
    --primary-dark: #1B5987;
    --accent: #D9A05B;
    --bg: #F5F9FE;
    --card-bg: #FFFFFF;
    --text-dark: #1F2A38;
    --text-secondary: #445566;
    --text-muted: #8B9AAC;
    --border: #DFE7F0;
    --footer-bg: #1F2A38;
    --footer-text: #B7C4D2;
    --radius: 10px;
    --radius-sm: 6px;
    --shadow-card: 0 2px 10px rgba(31,56,88,0.06);
    --shadow-card-hover: 0 8px 24px rgba(31,56,88,0.10);
    --section-gap: 88px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text-dark);
    font-size: 16px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

button, input {
    font-family: inherit;
    font-size: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Header 双层导航 ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: #fff;
    border-bottom: 1px solid var(--border);
    transition: box-shadow 0.3s ease;
}

.site-header.scrolled {
    box-shadow: 0 4px 20px rgba(31,56,88,0.08);
}

.header-top {
    height: 68px;
    display: flex;
    align-items: center;
}

.header-top-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 20px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.brand-icon {
    width: 36px;
    height: 36px;
    background: var(--primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
    font-weight: 700;
}

.brand-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.brand-text em {
    font-style: normal;
    color: var(--primary);
}

.header-search {
    position: relative;
    width: 240px;
    flex-shrink: 0;
}

.header-search input {
    width: 100%;
    height: 38px;
    border: 1px solid #D5E0EC;
    border-radius: var(--radius-sm);
    padding: 0 36px 0 14px;
    font-size: 14px;
    background: #F8FBFE;
    color: var(--text-dark);
    transition: all 0.25s ease;
}

.header-search input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(45,116,178,0.15);
    background: #fff;
}

.header-search i {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 14px;
    pointer-events: none;
}

.header-cta {
    flex-shrink: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 44px;
    padding: 0 24px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.25s ease;
    text-decoration: none;
    gap: 8px;
}

.btn-sm {
    height: 36px;
    padding: 0 18px;
    font-size: 14px;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(45,116,178,0.25);
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(45,116,178,0.30);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-light {
    background: #fff;
    color: var(--primary);
    box-shadow: 0 4px 14px rgba(0,0,0,0.10);
}

.btn-light:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(217,160,91,0.35);
}

.mobile-toggle {
    display: none;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 18px;
    color: var(--text-dark);
    cursor: pointer;
    align-items: center;
    justify-content: center;
}

/* 第二行频道 Tabs */
.header-tabs {
    background: var(--bg);
    border-top: 1px solid var(--border);
    height: 48px;
    display: flex;
    align-items: center;
}

.tab-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    white-space: nowrap;
    padding: 0;
}

.tab-nav::-webkit-scrollbar {
    display: none;
}

.tab-item {
    padding: 6px 18px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    text-decoration: none;
}

.tab-item:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.tab-item.active {
    background: #fff;
    color: var(--primary);
    font-weight: 600;
    box-shadow: 0 1px 4px rgba(31,56,88,0.08);
    border-bottom: 2px solid var(--primary);
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    background: #fff;
    border-top: 1px solid var(--border);
    padding: 16px 24px;
    box-shadow: 0 8px 24px rgba(31,56,88,0.10);
}

.mobile-menu.open {
    display: block;
}

.mobile-menu .mobile-search {
    width: 100%;
    margin-bottom: 12px;
}

.mobile-menu .mobile-search input {
    width: 100%;
    height: 40px;
    border: 1px solid #D5E0EC;
    border-radius: var(--radius-sm);
    padding: 0 14px;
    font-size: 14px;
}

.mobile-menu .mobile-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 12px;
}

.mobile-menu .mobile-links a {
    padding: 10px 0;
    color: var(--text-dark);
    border-bottom: 1px solid var(--border);
    font-size: 15px;
}

.mobile-menu .mobile-links a:hover {
    color: var(--primary);
}

/* ===== Hero ===== */
.hero {
    min-height: 560px;
    max-height: 680px;
    background-image: url('/assets/images/backpic/back-1.png');
    background-size: cover;
    background-position: center;
    position: relative;
    display: flex;
    align-items: center;
    padding-top: 116px;
    !important;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(255,255,255,0.92) 15%, rgba(255,255,255,0.55) 60%, rgba(255,255,255,0.1) 100%);
}

.hero-inner {
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-content {
    max-width: 680px;
}

.hero-title {
    font-size: 36px;
    line-height: 1.35;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 28px;
    max-width: 560px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-badge {
    position: absolute;
    right: 30px;
    bottom: 30px;
    background: rgba(255,255,255,0.70);
    backdrop-filter: blur(8px);
    border-radius: var(--radius);
    padding: 16px 22px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.6);
    box-shadow: var(--shadow-card);
}

.hero-badge-number {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
}

.hero-badge-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ===== 通用板块 ===== */
.section {
    padding: var(--section-gap) 0;
}

.section-alt {
    background: #fff;
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 52px;
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    line-height: 1.4;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.7;
}

.section-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.2s ease;
}

.section-link:hover {
    gap: 10px;
    color: var(--primary-dark);
}

/* ===== 服务板块 ===== */
.service-grid {
    margin: 0 -12px;
}

.service-col {
    padding: 12px;
}

.service-col-offset {
    margin-top: 20px;
}

.service-card {
    background: var(--card-bg);
    border: 1px solid #E3EAF2;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: all 0.3s ease;
    height: 100%;
}

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

.service-card-image {
    height: 150px;
    overflow: hidden;
}

.service-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.service-card:hover .service-card-image img {
    transform: scale(1.05);
}

.service-card-body {
    padding: 20px;
}

.service-card-body h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.service-card-body p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 0;
}

/* ===== 数据区块 ===== */
.stats-section {
    background: rgba(45,116,178,0.08);
    padding: 64px 0;
}

.stats-row {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 32px;
}

.stat-item {
    text-align: center;
    flex: 1;
    min-width: 140px;
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* ===== 案例板块 ===== */
.cases-section {
    background: #fff;
}

.cases-layout {
    display: flex;
    gap: 32px;
    align-items: stretch;
}

.cases-main {
    flex: 0 0 48%;
}

.case-main-image {
    border-radius: var(--radius);
    overflow: hidden;
    height: 340px;
    position: relative;
}

.case-main-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.case-main-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(31,42,56,0.35));
}

.case-main-image .case-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    z-index: 2;
}

.case-side {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.case-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: all 0.25s ease;
    flex: 1;
}

.case-item:hover {
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
    background: #fff;
}

.case-item-tag {
    display: inline-block;
    font-size: 12px;
    background: var(--primary-light);
    color: var(--primary);
    padding: 2px 12px;
    border-radius: 999px;
    font-weight: 500;
    margin-bottom: 10px;
}

.case-item-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
    line-height: 1.5;
}

.case-item-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
}

.case-item-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap 0.2s ease;
}

.case-item-link:hover {
    gap: 8px;
}

/* ===== 解决方案 ===== */
.solution-row {
    display: flex;
    align-items: center;
    gap: 48px;
    margin-bottom: 64px;
}

.solution-row:last-child {
    margin-bottom: 0;
}

.solution-row.reverse {
    flex-direction: row-reverse;
}

.solution-media {
    flex: 1;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.solution-media img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.solution-media:hover img {
    transform: scale(1.03);
}

.solution-content {
    flex: 1;
}

.solution-content h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
    line-height: 1.4;
}

.solution-content p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 18px;
}

.solution-list {
    list-style: none;
    margin: 0 0 20px 0;
    padding: 0;
}

.solution-list li {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 6px 0 6px 24px;
    position: relative;
    line-height: 1.6;
}

.solution-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

/* ===== 最新资讯 ===== */
.news-section {
    background: var(--bg);
}

.news-section .section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 100%;
    margin-bottom: 40px;
}

.news-section .section-header .section-title {
    margin-bottom: 0;
}

.news-grid {
    margin: 0 -12px;
}

.news-col {
    padding: 12px;
}

.news-card-link {
    display: block;
    height: 100%;
    text-decoration: none;
    color: inherit;
}

.news-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.news-card-image {
    position: relative;
    height: 140px;
    overflow: hidden;
}

.news-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.news-card:hover .news-card-image img {
    transform: scale(1.05);
}

.news-date-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: var(--primary);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 4px;
}

.news-card-body {
    padding: 18px 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.tag {
    display: inline-block;
    font-size: 12px;
    background: var(--primary-light);
    color: var(--primary);
    padding: 2px 12px;
    border-radius: 999px;
    font-weight: 500;
    margin-bottom: 10px;
    align-self: flex-start;
}

.news-card-body h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    line-height: 1.5;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-body p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    flex: 1;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-muted);
    margin-top: auto;
}

.read-more {
    color: var(--primary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap 0.2s ease;
}

.news-card:hover .read-more {
    gap: 8px;
}

.empty-state {
    grid-column: 1 / -1;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    color: var(--text-muted);
    font-size: 15px;
    width: 100%;
    padding: 32px;
}

/* ===== FAQ ===== */
.faq-section {
    background: #fff;
}

.faq-layout {
    display: flex;
    gap: 48px;
}

.faq-sidebar {
    flex: 0 0 280px;
}

.faq-sidebar .section-title {
    text-align: left;
    margin-bottom: 12px;
}

.faq-sidebar p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.7;
}

.faq-list {
    flex: 1;
}

.accordion-item {
    border: 1px solid #E3EAF2;
    border-radius: 8px;
    margin-bottom: 10px;
    background: #fff;
    overflow: hidden;
    transition: all 0.3s ease;
}

.accordion-item.is-active {
    background: #F8FBFE;
    border-color: var(--primary-light);
    box-shadow: 0 4px 16px rgba(45,116,178,0.08);
}

.accordion-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    user-select: none;
}

.accordion-title .accordion-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--primary);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.accordion-item.is-active .accordion-icon {
    transform: rotate(45deg);
    background: var(--primary);
    color: #fff;
}

.accordion-content {
    padding: 0 20px 16px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    display: none;
}

.accordion-item.is-active .accordion-content {
    display: block;
}

/* ===== CTA ===== */
.cta-section {
    background: var(--primary);
    padding: 72px 0;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -60%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: rgba(255,255,255,0.06);
    border-radius: 50%;
}

.cta-inner {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.cta-inner h2 {
    font-size: 28px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.cta-inner p {
    font-size: 15px;
    color: rgba(255,255,255,0.85);
    margin-bottom: 28px;
    line-height: 1.7;
}

/* ===== 页脚 ===== */
.site-footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 64px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
}

.footer-brand {
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.footer-brand em {
    font-style: normal;
    color: var(--accent);
}

.footer-about-text {
    font-size: 14px;
    line-height: 1.7;
    color: var(--footer-text);
}

.footer-col h4 {
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 16px;
}

.footer-col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: var(--footer-text);
    font-size: 14px;
    transition: color 0.2s ease;
}

.footer-col ul li a:hover {
    color: #fff;
}

.footer-contact li {
    font-size: 14px;
    color: var(--footer-text);
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.10);
    padding: 20px 0;
    font-size: 13px;
    color: rgba(183,196,210,0.7);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.footer-bottom a {
    color: rgba(183,196,210,0.7);
}

.footer-bottom a:hover {
    color: #fff;
}

/* ===== 响应式 ===== */
@media screen and (max-width: 1024px) {
    .hero {
        min-height: 500px;
    }
    .hero-title {
        font-size: 30px;
    }
    .cases-layout {
        flex-direction: column;
    }
    .cases-main {
        flex: none;
    }
    .case-main-image {
        height: 260px;
    }
    .solution-row {
        gap: 32px;
    }
    .solution-media img {
        height: 240px;
    }
    .faq-layout {
        flex-direction: column;
    }
    .faq-sidebar {
        flex: none;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .stats-row {
        gap: 24px;
    }
    .stat-number {
        font-size: 38px;
    }
}

@media screen and (max-width: 768px) {
    .header-search {
        display: none;
    }
    .header-cta .btn-sm {
        display: none;
    }
    .mobile-toggle {
        display: flex;
    }
    .header-tabs {
        height: 44px;
    }
    .tab-nav {
        padding: 0 12px;
    }
    .hero {
        min-height: 460px;
        padding-top: 104px;
    }
    .hero::before {
        background: linear-gradient(90deg, rgba(255,255,255,0.94) 20%, rgba(255,255,255,0.70) 70%, rgba(255,255,255,0.4) 100%);
    }
    .hero-title {
        font-size: 28px;
    }
    .hero-subtitle {
        font-size: 15px;
    }
    .hero-badge {
        display: none;
    }
    .section {
        padding: 56px 0;
    }
    .section-title {
        font-size: 24px;
    }
    .service-grid {
        margin: 0;
    }
    .service-col {
        padding: 8px 0;
    }
    .service-col-offset {
        margin-top: 0;
    }
    .solution-row,
    .solution-row.reverse {
        flex-direction: column;
        gap: 24px;
    }
    .solution-media img {
        height: 200px;
    }
    .news-section .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    .news-col {
        padding: 8px 0;
    }
    .faq-layout {
        gap: 32px;
    }
    .cta-section {
        padding: 56px 0;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    .stats-row {
        flex-direction: row;
        flex-wrap: wrap;
    }
    .stat-item {
        flex: 0 0 50%;
    }
}

@media screen and (max-width: 640px) {
    .container {
        padding: 0 16px;
    }
    .brand-text {
        font-size: 18px;
    }
    .hero {
        min-height: 420px;
        padding-top: 96px;
    }
    .hero-title {
        font-size: 26px;
        line-height: 1.4;
    }
    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    .hero-actions .btn {
        width: 100%;
    }
    .stat-number {
        font-size: 32px;
    }
    .case-main-image {
        height: 200px;
    }
    .section-link {
        font-size: 13px;
    }
}

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #2D74B2;
            --primary-dark: #1B5987;
            --primary-light: #E8F1F9;
            --accent: #D9A05B;
            --bg-page: #F5F9FE;
            --bg-card: #FFFFFF;
            --text-dark: #1F2A38;
            --text-main: #445566;
            --text-weak: #8B9AAC;
            --border: #DFE7F0;
            --border-deep: #E3EAF2;
            --footer-bg: #1F2A38;
            --footer-text: #B7C4D2;
            --radius-card: 10px;
            --radius-btn: 6px;
            --radius-img: 10px;
            --shadow-card: 0 2px 10px rgba(31, 56, 88, 0.06);
            --shadow-hover: 0 8px 24px rgba(31, 56, 88, 0.10);
            --space-section: 88px;
            --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            background-color: var(--bg-page);
            color: var(--text-dark);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }

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

        button, input, select, textarea {
            font-family: inherit;
        }

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 44px;
            padding: 0 28px;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            line-height: 1;
            cursor: pointer;
            border: 1px solid transparent;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .btn-primary {
            background-color: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 2px 8px rgba(45, 116, 178, 0.2);
        }

        .btn-primary:hover {
            background-color: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(45, 116, 178, 0.28);
        }

        .btn-secondary {
            background-color: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }

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

        .btn-accent {
            background-color: #fff;
            color: var(--primary);
            border-color: #fff;
            box-shadow: 0 2px 10px rgba(31, 56, 88, 0.15);
        }

        .btn-accent:hover {
            background-color: var(--accent);
            border-color: var(--accent);
            color: #fff;
            box-shadow: 0 6px 20px rgba(217, 160, 91, 0.3);
            transform: translateY(-2px);
        }

        .btn-small {
            height: 36px;
            padding: 0 18px;
            font-size: 14px;
        }

        /* ===== Top Header (Layer 1) ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            background-color: #fff;
            border-bottom: 1px solid var(--border);
            transition: box-shadow 0.3s ease;
        }

        .site-header.scrolled {
            box-shadow: 0 4px 16px rgba(31, 56, 88, 0.08);
        }

        .header-top {
            height: 68px;
            display: flex;
            align-items: center;
        }

        .header-top-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            gap: 20px;
        }

        .brand-logo {
            display: inline-flex;
            align-items: baseline;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-dark);
            letter-spacing: 0.5px;
            line-height: 1.2;
            flex-shrink: 0;
        }

        .brand-logo em {
            font-style: normal;
            color: var(--primary);
            margin-left: 4px;
            font-weight: 700;
        }

        .brand-logo .logo-icon {
            width: 32px;
            height: 32px;
            background: var(--primary-light);
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-right: 8px;
            color: var(--primary);
            font-size: 15px;
            transform: translateY(2px);
        }

        .header-search {
            position: relative;
            width: 240px;
            flex-shrink: 0;
        }

        .header-search input {
            width: 100%;
            height: 38px;
            border: 1px solid #D5E0EC;
            border-radius: var(--radius-btn);
            padding: 0 38px 0 14px;
            font-size: 14px;
            background-color: #fff;
            color: var(--text-dark);
            outline: none;
            transition: border-color 0.2s, box-shadow 0.2s;
        }

        .header-search input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(45, 116, 178, 0.15);
        }

        .header-search input::placeholder {
            color: var(--text-weak);
        }

        .header-search .search-icon {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 14px;
            color: var(--text-weak);
            pointer-events: none;
        }

        .header-cta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .mobile-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border: 1px solid var(--border);
            background: #fff;
            border-radius: var(--radius-btn);
            color: var(--text-dark);
            font-size: 18px;
            cursor: pointer;
            align-items: center;
            justify-content: center;
            transition: all 0.2s;
        }

        .mobile-toggle:hover {
            background: var(--primary-light);
            border-color: var(--primary);
        }

        /* ===== Tab Nav (Layer 2) ===== */
        .tab-nav {
            height: 48px;
            background-color: var(--bg-page);
            border-top: 1px solid var(--border);
            display: flex;
            align-items: center;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }

        .tab-nav::-webkit-scrollbar {
            display: none;
        }

        .tab-nav {
            padding: 6px 24px;
            gap: 8px;
            white-space: nowrap;
        }

        .tab-item {
            display: inline-flex;
            align-items: center;
            padding: 6px 18px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-main);
            transition: all 0.2s;
            line-height: 1.4;
        }

        .tab-item:hover {
            background-color: var(--primary-light);
            color: var(--primary-dark);
        }

        .tab-item.active {
            background-color: #fff;
            color: var(--primary);
            font-weight: 600;
            box-shadow: 0 1px 4px rgba(31, 56, 88, 0.08);
            border: 1px solid var(--border-deep);
        }

        /* ===== Mobile Menu ===== */
        .mobile-menu {
            display: none;
            background-color: #fff;
            border-bottom: 1px solid var(--border);
            padding: 16px 24px;
        }

        .mobile-menu.open {
            display: block;
        }

        .mobile-menu .mobile-search {
            margin-bottom: 12px;
        }

        .mobile-menu .mobile-search input {
            width: 100%;
            height: 40px;
            border: 1px solid #D5E0EC;
            border-radius: var(--radius-btn);
            padding: 0 14px;
            font-size: 14px;
            outline: none;
        }

        .mobile-menu .mobile-search input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(45, 116, 178, 0.15);
        }

        .mobile-menu .mobile-menu-cta {
            display: flex;
            gap: 10px;
        }

        .mobile-menu .mobile-menu-cta .btn {
            flex: 1;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-bar {
            background: #fff;
            border-bottom: 1px solid var(--border);
            padding: 16px 0;
            margin-top: 116px;
        }

        .breadcrumb-inner {
            font-size: 13px;
            color: var(--text-weak);
        }

        .breadcrumb-inner a {
            color: var(--text-weak);
        }

        .breadcrumb-inner a:hover {
            color: var(--primary);
        }

        .breadcrumb-inner .sep {
            margin: 0 8px;
            color: #C6D2DE;
        }

        .breadcrumb-inner .current {
            color: var(--text-main);
        }

        /* ===== Banner / Page Hero ===== */
        .category-banner {
            position: relative;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            min-height: 360px;
            display: flex;
            align-items: center;
            padding: 72px 0;
            overflow: hidden;
        }

        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(245, 249, 254, 0.95) 10%, rgba(245, 249, 254, 0.75) 45%, rgba(245, 249, 254, 0.35) 100%);
        }

        .category-banner .container {
            position: relative;
            z-index: 2;
        }

        .category-banner-inner {
            max-width: 680px;
        }

        .category-banner .banner-tag {
            display: inline-block;
            background: rgba(255, 255, 255, 0.85);
            border: 1px solid var(--border-deep);
            border-radius: 999px;
            padding: 5px 16px;
            font-size: 13px;
            color: var(--primary);
            font-weight: 600;
            margin-bottom: 18px;
            backdrop-filter: blur(4px);
        }

        .category-banner h1 {
            font-size: 36px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-dark);
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }

        .category-banner h1 span {
            color: var(--primary);
        }

        .category-banner p {
            font-size: 16px;
            color: var(--text-main);
            line-height: 1.8;
            margin-bottom: 24px;
        }

        .banner-stats {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }

        .banner-stat {
            background: rgba(255, 255, 255, 0.7);
            border-radius: var(--radius-card);
            padding: 14px 22px;
            backdrop-filter: blur(6px);
            border: 1px solid rgba(255, 255, 255, 0.6);
            box-shadow: 0 2px 8px rgba(31, 56, 88, 0.06);
        }

        .banner-stat .num {
            font-size: 24px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
        }

        .banner-stat .label {
            font-size: 13px;
            color: var(--text-main);
            margin-top: 2px;
        }

        /* ===== Anchor Nav ===== */
        .anchor-nav-section {
            background: #fff;
            border-bottom: 1px solid var(--border);
            padding: 16px 0;
        }

        .anchor-nav-inner {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .anchor-nav-inner .nav-label {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-dark);
            margin-right: 4px;
        }

        .anchor-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 7px 18px;
            border-radius: 999px;
            border: 1px solid var(--border-deep);
            background: var(--bg-page);
            font-size: 14px;
            color: var(--text-main);
            transition: all 0.2s;
        }

        .anchor-link i {
            font-size: 12px;
            color: var(--primary);
        }

        .anchor-link:hover {
            background: var(--primary-light);
            border-color: var(--primary);
            color: var(--primary-dark);
        }

        /* ===== Section Base ===== */
        .section {
            padding: var(--space-section) 0;
        }

        .section-alt {
            background-color: #fff;
        }

        .section-header {
            margin-bottom: 42px;
            max-width: 720px;
        }

        .section-header h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.3;
            margin-bottom: 10px;
            letter-spacing: 0.3px;
        }

        .section-header h2 em {
            font-style: normal;
            color: var(--primary);
        }

        .section-header p {
            font-size: 16px;
            color: var(--text-main);
            line-height: 1.7;
        }

        /* ===== Text + Image Alternating ===== */
        .feature-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
            margin-bottom: 88px;
        }

        .feature-row:last-child {
            margin-bottom: 0;
        }

        .feature-row.reverse .feature-image {
            order: 2;
        }

        .feature-row.reverse .feature-content {
            order: 1;
        }

        .feature-image {
            border-radius: var(--radius-img);
            overflow: hidden;
            box-shadow: var(--shadow-hover);
            line-height: 0;
        }

        .feature-image img {
            width: 100%;
            height: 340px;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .feature-image:hover img {
            transform: scale(1.03);
        }

        .feature-content .feature-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            border-radius: 999px;
            padding: 4px 14px;
            margin-bottom: 16px;
        }

        .feature-content h3 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.4;
            margin-bottom: 14px;
        }

        .feature-content p {
            font-size: 16px;
            color: var(--text-main);
            line-height: 1.8;
            margin-bottom: 16px;
        }

        .feature-content .text-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 15px;
            font-weight: 600;
            color: var(--primary);
            transition: gap 0.2s;
        }

        .feature-content .text-link:hover {
            gap: 10px;
            color: var(--primary-dark);
        }

        /* ===== Checklist ===== */
        .check-list {
            list-style: none;
            margin: 20px 0 0;
            padding: 0;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }

        .check-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            background: var(--bg-page);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 14px 16px;
            font-size: 15px;
            color: var(--text-main);
            transition: border-color 0.2s, box-shadow 0.2s;
        }

        .check-list li:hover {
            border-color: var(--primary);
            box-shadow: 0 4px 12px rgba(45, 116, 178, 0.08);
        }

        .check-list li i {
            color: var(--primary);
            font-size: 15px;
            margin-top: 3px;
            flex-shrink: 0;
        }

        .check-list li strong {
            color: var(--text-dark);
            font-weight: 600;
            display: block;
            font-size: 15px;
            line-height: 1.5;
        }

        .check-list li span {
            font-size: 13px;
            color: var(--text-weak);
            line-height: 1.5;
            display: block;
            margin-top: 2px;
        }

        /* ===== Service Cards ===== */
        .service-cards-wrap {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .service-card {
            background: var(--bg-card);
            border: 1px solid var(--border-deep);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all 0.25s ease;
            display: flex;
            flex-direction: column;
        }

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

        .service-card .card-image {
            height: 170px;
            overflow: hidden;
            line-height: 0;
        }

        .service-card .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .service-card:hover .card-image img {
            transform: scale(1.05);
        }

        .service-card .card-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .service-card .card-body h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .service-card .card-body p {
            font-size: 14px;
            color: var(--text-main);
            line-height: 1.65;
            flex: 1;
            margin-bottom: 14px;
        }

        .service-card .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 5px;
            transition: gap 0.2s;
        }

        .service-card .card-link:hover {
            gap: 9px;
            color: var(--primary-dark);
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: #fff;
        }

        .faq-wrapper {
            display: grid;
            grid-template-columns: 320px 1fr;
            gap: 64px;
        }

        .faq-heading h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.3;
            margin-bottom: 12px;
        }

        .faq-heading p {
            font-size: 15px;
            color: var(--text-main);
            line-height: 1.7;
        }

        .custom-accordion {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .custom-accordion .accordion-item {
            border: 1px solid var(--border-deep);
            border-radius: var(--radius-card);
            margin-bottom: 12px;
            background: #fff;
            overflow: hidden;
            transition: border-color 0.2s;
        }

        .custom-accordion .accordion-item:hover {
            border-color: var(--primary);
        }

        .custom-accordion .accordion-title {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            background: transparent;
            cursor: pointer;
            position: relative;
            transition: background 0.2s;
        }

        .custom-accordion .accordion-title::after {
            content: '+';
            font-size: 22px;
            font-weight: 400;
            color: var(--primary);
            transition: transform 0.3s ease;
            line-height: 1;
        }

        .custom-accordion .accordion-item.is-active .accordion-title {
            background: var(--primary-light);
        }

        .custom-accordion .accordion-item.is-active .accordion-title::after {
            transform: rotate(45deg);
        }

        .custom-accordion .accordion-content {
            padding: 0 22px 20px;
            border-top: 0;
            background: var(--bg-page);
            font-size: 15px;
            color: var(--text-main);
            line-height: 1.75;
        }

        /* ===== CTA ===== */
        .cta-section {
            background-color: var(--primary);
            padding: 64px 0;
            text-align: center;
        }

        .cta-section h2 {
            font-size: 28px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }

        /* ===== Footer ===== */
        .site-footer {
            background-color: var(--footer-bg);
            color: var(--footer-text);
            padding: 56px 0 0;
            font-size: 14px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(183, 196, 210, 0.12);
        }

        .footer-brand {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }

        .footer-brand em {
            font-style: normal;
            color: var(--accent);
        }

        .footer-about-text {
            font-size: 14px;
            line-height: 1.75;
            color: var(--footer-text);
            max-width: 300px;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul li a {
            color: var(--footer-text);
            font-size: 14px;
            transition: color 0.2s, padding-left 0.2s;
        }

        .footer-col ul li a:hover {
            color: #fff;
            padding-left: 4px;
        }

        .footer-contact li {
            line-height: 1.6;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: var(--footer-text);
        }

        .footer-bottom a {
            color: var(--footer-text);
        }

        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .header-search {
                width: 180px;
            }

            .faq-wrapper {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .feature-row {
                gap: 36px;
                margin-bottom: 64px;
            }

            .service-cards-wrap {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }

            .category-banner {
                min-height: 320px;
                padding: 48px 0;
            }

            .category-banner h1 {
                font-size: 28px;
            }

            .category-banner p {
                font-size: 15px;
            }

            .feature-row {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .feature-row.reverse .feature-image {
                order: 0;
            }

            .feature-row.reverse .feature-content {
                order: 0;
            }

            .feature-image img {
                height: 240px;
            }

            .check-list {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }

            .header-top {
                height: 60px;
            }

            .breadcrumb-bar {
                margin-top: 108px;
            }

            .header-search {
                display: none;
            }

            .header-cta .btn {
                display: none;
            }

            .mobile-toggle {
                display: inline-flex;
            }
        }

        @media (max-width: 640px) {
            .tab-nav {
                height: 44px;
            }

            .tab-item {
                padding: 5px 14px;
                font-size: 14px;
            }

            .category-banner h1 {
                font-size: 26px;
            }

            .section-header h2 {
                font-size: 24px;
            }

            .feature-content h3 {
                font-size: 22px;
            }

            .service-cards-wrap {
                grid-template-columns: 1fr;
            }

            .banner-stat .num {
                font-size: 20px;
            }

            .banner-stats {
                gap: 12px;
            }

            .banner-stat {
                padding: 10px 16px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .anchor-nav-inner {
                gap: 8px;
            }

            .anchor-link {
                padding: 5px 12px;
                font-size: 13px;
            }

            .category-banner p {
                font-size: 14px;
            }
        }

/* roulang page: article */
:root {
            --primary: #2D74B2;
            --primary-dark: #1B5987;
            --primary-light: #E8F1F9;
            --accent: #D9A05B;
            --accent-dark: #c8904d;
            --bg: #F5F9FE;
            --card: #FFFFFF;
            --text: #1F2A38;
            --text-secondary: #445566;
            --text-muted: #8B9AAC;
            --border: #DFE7F0;
            --footer-bg: #1F2A38;
            --footer-text: #B7C4D2;
            --radius: 10px;
            --radius-sm: 6px;
            --shadow: 0 2px 10px rgba(31, 56, 88, 0.06);
            --shadow-hover: 0 8px 24px rgba(31, 56, 88, 0.10);
            --transition: 0.2s ease;
        }

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

        body {
            margin: 0;
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

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

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

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

        ul, ol {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .site-main {
            padding-top: 116px;
            min-height: 60vh;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 44px;
            padding: 0 24px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            border: none;
            transition: all var(--transition);
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(45, 116, 178, 0.25);
            color: #fff;
        }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 1.5px solid var(--primary);
        }

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

        .btn-sm {
            height: 36px;
            padding: 0 18px;
            font-size: 14px;
            border-radius: var(--radius-sm);
        }

        .btn-accent {
            background: var(--accent);
            color: #fff;
        }

        .btn-accent:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(217, 160, 91, 0.35);
            color: #fff;
        }

        .btn-lg {
            height: 48px;
            padding: 0 32px;
            font-size: 16px;
        }

        .text-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            transition: gap var(--transition);
        }

        .text-link:hover {
            gap: 14px;
            color: var(--primary-dark);
        }

        /* ===== 标签 ===== */
        .tag {
            display: inline-block;
            padding: 4px 14px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 999px;
            font-size: 13px;
            line-height: 1.4;
            font-weight: 600;
        }

        /* ===== Header 双层导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: #fff;
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }

        .site-header.scrolled {
            box-shadow: 0 4px 12px rgba(31, 56, 88, 0.08);
        }

        .header-top {
            height: 68px;
            border-bottom: 1px solid rgba(223, 231, 240, 0.6);
        }

        .header-top-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            gap: 20px;
        }

        .brand-logo {
            font-size: 22px;
            font-weight: 700;
            color: var(--text);
            letter-spacing: -0.5px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .brand-logo em {
            font-style: normal;
            color: var(--primary);
            font-weight: 700;
        }

        .header-search {
            position: relative;
            width: 240px;
            flex-shrink: 0;
        }

        .header-search input {
            width: 100%;
            height: 36px;
            padding: 0 40px 0 14px;
            border: 1px solid #D5E0EC;
            border-radius: var(--radius-sm);
            font-size: 14px;
            color: var(--text);
            background: #fff;
            transition: all var(--transition);
        }

        .header-search input::placeholder {
            color: var(--text-muted);
        }

        .header-search input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(45, 116, 178, 0.15);
        }

        .header-search button {
            position: absolute;
            right: 4px;
            top: 4px;
            height: 28px;
            width: 32px;
            border: none;
            background: transparent;
            color: var(--text-muted);
            cursor: pointer;
            font-size: 14px;
            border-radius: var(--radius-sm);
            transition: color var(--transition);
        }

        .header-search button:hover {
            color: var(--primary);
        }

        .header-top .btn {
            flex-shrink: 0;
        }

        .mobile-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            background: #fff;
            color: var(--text);
            font-size: 18px;
            cursor: pointer;
            align-items: center;
            justify-content: center;
            transition: all var(--transition);
        }

        .mobile-toggle:hover {
            background: var(--primary-light);
            border-color: var(--primary);
            color: var(--primary);
        }

        .header-bottom {
            height: 48px;
            background: var(--bg);
            display: flex;
            align-items: center;
            border-bottom: 1px solid rgba(223, 231, 240, 0.4);
        }

        .tab-nav {
            display: flex;
            gap: 8px;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
            align-items: center;
            height: 100%;
        }

        .tab-nav::-webkit-scrollbar {
            display: none;
        }

        .tab-item {
            display: inline-flex;
            align-items: center;
            padding: 7px 20px;
            border-radius: 999px;
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 600;
            white-space: nowrap;
            transition: all var(--transition);
            border: 1px solid transparent;
        }

        .tab-item:hover {
            background: var(--primary-light);
            color: var(--primary);
        }

        .tab-item.active {
            background: #fff;
            color: var(--primary);
            box-shadow: var(--shadow);
            border-color: var(--border);
            position: relative;
        }

        .tab-item.active::after {
            content: '';
            position: absolute;
            left: 20px;
            right: 20px;
            bottom: -16px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }

        /* 移动端下拉导航 */
        .mobile-nav {
            display: none;
            background: #fff;
            border-bottom: 1px solid var(--border);
            padding: 8px 0;
        }

        .mobile-nav.open {
            display: block;
        }

        .mobile-nav a {
            display: block;
            padding: 12px 24px;
            font-size: 15px;
            color: var(--text-secondary);
            border-bottom: 1px solid rgba(223, 231, 240, 0.4);
            transition: all var(--transition);
        }

        .mobile-nav a:last-child {
            border-bottom: none;
        }

        .mobile-nav a:hover,
        .mobile-nav a.active {
            background: var(--primary-light);
            color: var(--primary);
        }

        /* ===== 页面 Banner ===== */
        .page-banner {
            background-size: cover;
            background-position: center;
            padding: 48px 0 36px;
            position: relative;
        }

        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(255,255,255,0.94) 10%, rgba(255,255,255,0.72) 55%, rgba(255,255,255,0.30) 100%);
        }

        .page-banner .container {
            position: relative;
            z-index: 1;
        }

        .banner-inner {
            max-width: 840px;
        }

        .breadcrumb-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
        }

        .breadcrumb {
            font-size: 13px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 4px;
        }

        .breadcrumb a {
            color: var(--primary);
            transition: color var(--transition);
        }

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

        .breadcrumb .sep {
            margin: 0 6px;
            color: var(--border);
            font-size: 12px;
        }

        .breadcrumb-current {
            max-width: 260px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            color: var(--text-secondary);
            font-weight: 600;
        }

        .back-link {
            font-size: 13px;
            color: var(--text-secondary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition);
        }

        .back-link:hover {
            color: var(--primary);
            gap: 10px;
        }

        .banner-note {
            margin-top: 18px;
            font-size: 14px;
            color: var(--text-muted);
            border-left: 3px solid var(--primary);
            padding-left: 12px;
        }

        .banner-note strong {
            color: var(--text);
            font-weight: 600;
        }

        /* ===== 文章主体 ===== */
        .article-main {
            padding: 40px 0 64px;
        }

        .article-card {
            background: var(--card);
            border-radius: 12px;
            padding: 40px 48px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }

        .article-header {
            margin-bottom: 32px;
            padding-bottom: 24px;
            border-bottom: 1px solid var(--border);
        }

        .article-header h1 {
            font-size: 34px;
            font-weight: 700;
            line-height: 1.4;
            margin: 0 0 16px;
            color: var(--text);
            word-break: break-word;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            color: var(--text-muted);
            font-size: 14px;
        }

        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .article-meta i {
            font-size: 13px;
            color: var(--primary);
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 16px;
        }

        .article-content {
            font-size: 16px;
            line-height: 1.8;
            color: var(--text);
        }

        .article-content p {
            margin: 0 0 16px;
        }

        .article-content h2 {
            font-size: 28px;
            font-weight: 700;
            margin: 36px 0 16px;
            color: var(--text);
            line-height: 1.4;
        }

        .article-content h3 {
            font-size: 22px;
            font-weight: 600;
            margin: 28px 0 14px;
            color: var(--text);
            line-height: 1.4;
        }

        .article-content img {
            width: 100%;
            border-radius: 12px;
            margin: 20px 0;
            box-shadow: var(--shadow);
        }

        .article-content blockquote {
            border-left: 3px solid var(--primary);
            background: var(--primary-light);
            padding: 18px 22px;
            border-radius: 0 8px 8px 0;
            margin: 20px 0;
            color: var(--text-secondary);
            font-size: 15px;
        }

        .article-content code {
            background: var(--primary-light);
            padding: 3px 7px;
            border-radius: 4px;
            font-size: 14px;
            color: var(--primary-dark);
            font-family: "SF Mono", Consolas, monospace;
        }

        .article-content pre {
            background: var(--footer-bg);
            color: #E8F1F9;
            padding: 20px;
            border-radius: 8px;
            overflow-x: auto;
            margin: 20px 0;
            font-size: 14px;
            line-height: 1.7;
        }

        .article-content pre code {
            background: transparent;
            color: inherit;
            padding: 0;
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 14px;
        }

        .article-content th,
        .article-content td {
            padding: 12px 14px;
            border: 1px solid var(--border);
            text-align: left;
            line-height: 1.6;
        }

        .article-content th {
            background: var(--primary-light);
            color: var(--text);
            font-weight: 600;
        }

        .article-content ul,
        .article-content ol {
            padding-left: 20px;
            margin: 0 0 16px;
            line-height: 1.8;
        }

        .article-content li {
            margin-bottom: 6px;
        }

        .article-footer {
            margin-top: 32px;
            padding-top: 20px;
            border-top: 1px solid var(--border);
        }

        .copyright-note {
            font-size: 12px;
            color: var(--text-muted);
            margin: 16px 0 0;
            padding-top: 12px;
            border-top: 1px dashed var(--border);
        }

        /* 文章未找到 */
        .article-not-found {
            text-align: center;
            padding: 80px 24px;
        }

        .article-not-found i {
            font-size: 48px;
            color: var(--primary-light);
            margin-bottom: 16px;
        }

        .article-not-found p {
            font-size: 20px;
            font-weight: 600;
            color: var(--text);
            margin: 0 0 24px;
        }

        /* ===== 侧边栏 ===== */
        .article-sidebar {
            position: sticky;
            top: 130px;
            padding-left: 8px;
        }

        .side-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            margin-bottom: 20px;
        }

        .side-card h3 {
            font-size: 16px;
            font-weight: 600;
            margin: 0 0 16px;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--border);
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .side-card h3 i {
            color: var(--primary);
            font-size: 14px;
        }

        .side-info-list li {
            display: flex;
            justify-content: space-between;
            padding: 8px 0;
            font-size: 14px;
            border-bottom: 1px dashed rgba(223, 231, 240, 0.6);
        }

        .side-info-list li:last-child {
            border-bottom: none;
        }

        .side-info-list li span {
            color: var(--text-muted);
        }

        .side-info-list li strong {
            color: var(--text);
            font-weight: 600;
            max-width: 60%;
            text-align: right;
        }

        .side-list li {
            margin-bottom: 10px;
            font-size: 14px;
        }

        .side-list li:last-child {
            margin-bottom: 0;
        }

        .side-list a {
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 12px;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
        }

        .side-list a:hover {
            background: var(--primary-light);
            color: var(--primary);
            padding-left: 16px;
        }

        .side-list a i {
            font-size: 12px;
            color: var(--text-muted);
            width: 16px;
            text-align: center;
        }

        .side-list a:hover i {
            color: var(--primary);
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            background: var(--bg);
            padding: 64px 0;
            border-top: 1px solid rgba(223, 231, 240, 0.5);
        }

        .section-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 32px;
            flex-wrap: wrap;
            gap: 12px;
        }

        .section-header h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text);
            margin: 0;
            position: relative;
            padding-left: 14px;
        }

        .section-header h2::before {
            content: '';
            position: absolute;
            left: 0;
            top: 4px;
            bottom: 4px;
            width: 4px;
            border-radius: 2px;
            background: var(--primary);
        }

        .related-card {
            background: #fff;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: all var(--transition);
            display: block;
            height: 100%;
            margin-bottom: 20px;
        }

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

        .related-card img {
            width: 100%;
            height: 150px;
            object-fit: cover;
            display: block;
        }

        .related-card-body {
            padding: 20px;
        }

        .related-card-body .tag {
            font-size: 12px;
            padding: 3px 10px;
        }

        .related-card-body h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            margin: 10px 0 8px;
            line-height: 1.5;
        }

        .related-card-body p {
            font-size: 14px;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.6;
        }

        /* ===== CTA 联系区 ===== */
        .cta-section {
            background: var(--primary);
            padding: 64px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -40px;
            right: -40px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -60px;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
        }

        .cta-section .container {
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            color: #fff;
            font-size: 28px;
            font-weight: 700;
            margin: 0 0 12px;
        }

        .cta-section p {
            color: rgba(255, 255, 255, 0.9);
            font-size: 15px;
            max-width: 600px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }

        .cta-section .btn-accent {
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--footer-bg);
            color: var(--footer-text);
            padding: 56px 0 0;
            font-size: 14px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(183, 196, 210, 0.15);
        }

        .footer-col h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin: 0 0 16px;
        }

        .footer-brand {
            font-size: 22px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .footer-brand em {
            font-style: normal;
            color: var(--accent);
        }

        .footer-about-text {
            color: var(--footer-text);
            line-height: 1.7;
            margin: 0;
            max-width: 340px;
            font-size: 14px;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col a {
            color: var(--footer-text);
            transition: color var(--transition);
        }

        .footer-col a:hover {
            color: #fff;
        }

        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-contact i {
            color: var(--accent);
            font-size: 14px;
            width: 16px;
            text-align: center;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 0;
            flex-wrap: wrap;
            gap: 8px;
            color: rgba(183, 196, 210, 0.8);
            font-size: 13px;
        }

        .footer-bottom a {
            color: var(--footer-text);
        }

        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }

            .article-card {
                padding: 32px 28px;
            }
        }

        @media (max-width: 768px) {
            .header-top-inner {
                gap: 12px;
            }

            .header-search {
                width: 180px;
            }

            .article-card {
                padding: 28px 20px;
            }

            .article-header h1 {
                font-size: 28px;
            }

            .article-content h2 {
                font-size: 24px;
            }

            .article-content h3 {
                font-size: 20px;
            }

            .related-card-body h3 {
                font-size: 15px;
            }
        }

        @media (max-width: 640px) {
            .site-main {
                padding-top: 108px;
            }

            .header-top {
                height: 60px;
            }

            .header-top-inner {
                gap: 8px;
            }

            .brand-logo {
                font-size: 20px;
                flex: 1;
            }

            .header-search {
                display: none;
            }

            .header-top .btn {
                display: none;
            }

            .mobile-toggle {
                display: inline-flex;
            }

            .header-bottom {
                height: 44px;
            }

            .tab-item {
                padding: 6px 16px;
                font-size: 13px;
            }

            .tab-item.active::after {
                left: 16px;
                right: 16px;
                bottom: -14px;
            }

            .page-banner {
                padding: 32px 0 24px;
            }

            .breadcrumb-row {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }

            .breadcrumb-current {
                max-width: 200px;
            }

            .banner-note {
                font-size: 13px;
                margin-top: 12px;
            }

            .article-main {
                padding: 24px 0 48px;
            }

            .article-card {
                padding: 24px 16px;
                border-radius: 8px;
            }

            .article-meta {
                gap: 12px;
                font-size: 13px;
            }

            .article-sidebar {
                position: static;
                padding-left: 0;
                margin-top: 24px;
            }

            .side-card {
                padding: 20px;
            }

            .related-section {
                padding: 48px 0;
            }

            .section-header h2 {
                font-size: 24px;
            }

            .cta-section {
                padding: 48px 0;
            }

            .cta-section h2 {
                font-size: 24px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

/* roulang page: category2 */
:root {
  --primary: #2D74B2;
  --primary-light: #E8F1F9;
  --primary-dark: #1B5987;
  --accent: #D9A05B;
  --bg: #F5F9FE;
  --card-bg: #FFFFFF;
  --text-dark: #1F2A38;
  --text-body: #445566;
  --text-muted: #8B9AAC;
  --border: #DFE7F0;
  --footer-bg: #1F2A38;
  --footer-text: #B7C4D2;
  --radius: 10px;
  --radius-btn: 6px;
  --shadow-card: 0 2px 10px rgba(31, 56, 88, 0.06);
  --shadow-hover: 0 8px 24px rgba(31, 56, 88, 0.10);
  --transition: all 0.2s ease;
  --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 130px; }
body {
  font-family: var(--font-stack);
  background: var(--bg);
  color: var(--text-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
body.no-scroll { overflow: hidden; }
img { max-width: 100%; display: block; height: auto; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
ul, ol { padding: 0; list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; width: 100%; }
.section-pad { padding: 88px 0; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 28px;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  gap: 8px;
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(45, 116, 178, 0.20);
}
.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(45, 116, 178, 0.28);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  transform: translateY(-1px);
}
.btn-lg { height: 52px; padding: 0 36px; font-size: 16px; }
.btn-sm { height: 36px; padding: 0 18px; font-size: 14px; }
.btn-accent {
  background: #fff;
  color: var(--primary);
}
.btn-accent:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(217, 160, 91, 0.35);
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  box-shadow: 0 1px 0 var(--border);
  transition: box-shadow 0.25s ease;
}
.site-header.is-scrolled { box-shadow: 0 4px 16px rgba(31, 56, 88, 0.08); }
.header-top { background: #fff; border-bottom: 1px solid var(--border); }
.header-top-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 68px;
  position: relative;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.brand-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}
.brand-text {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-dark);
  letter-spacing: -0.3px;
  line-height: 1.2;
  white-space: nowrap;
}
.brand-text em {
  font-style: normal;
  color: var(--primary);
}
.header-search {
  flex: 1;
  max-width: 240px;
  margin-left: auto;
  position: relative;
}
.header-search input {
  width: 100%;
  height: 38px;
  border: 1px solid #D5E0EC;
  border-radius: var(--radius-btn);
  padding: 0 40px 0 14px;
  font-size: 14px;
  color: var(--text-dark);
  background: var(--bg);
  transition: var(--transition);
}
.header-search input:focus {
  outline: none;
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(45, 116, 178, 0.15);
}
.header-search input::placeholder { color: var(--text-muted); }
.header-search button {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 14px;
}
.header-search button:hover { color: var(--primary); }
.header-cta { flex-shrink: 0; }
.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  color: var(--text-dark);
  cursor: pointer;
  font-size: 18px;
  transition: var(--transition);
  flex-shrink: 0;
}
.menu-toggle:hover { background: var(--primary-light); color: var(--primary); }

.tab-nav {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  height: 48px;
}
.tab-nav-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 48px;
  overflow-x: auto;
  scrollbar-width: none;
}
.tab-nav-inner::-webkit-scrollbar { display: none; }
.tab-item {
  display: inline-flex;
  align-items: center;
  padding: 6px 18px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--text-body);
  text-decoration: none;
  white-space: nowrap;
  transition: var(--transition);
  border: 1px solid transparent;
}
.tab-item:hover {
  background: var(--primary-light);
  color: var(--primary);
}
.tab-item.active {
  background: #fff;
  color: var(--primary);
  font-weight: 600;
  border-color: var(--border);
  box-shadow: 0 2px 6px rgba(31, 56, 88, 0.05);
}
.tab-item:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Mobile drawer */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 280px;
  max-width: 85vw;
  background: #fff;
  z-index: 200;
  padding: 28px 24px;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  box-shadow: -8px 0 24px rgba(31, 56, 88, 0.15);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.mobile-drawer.open { transform: translateX(0); }
.drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(31, 42, 56, 0.4);
  z-index: 199;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}
.drawer-overlay.show { opacity: 1; visibility: visible; }
.mobile-drawer .drawer-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.mobile-drawer .drawer-brand em { font-style: normal; color: var(--primary); }
.mobile-drawer a {
  padding: 12px 14px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--text-body);
  text-decoration: none;
  transition: var(--transition);
}
.mobile-drawer a:hover,
.mobile-drawer a.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }

/* ===== Category Hero ===== */
.cat-hero {
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: center;
  background-image: linear-gradient(90deg, rgba(255,255,255,0.94) 15%, rgba(255,255,255,0.75) 55%, rgba(255,255,255,0.2) 100%), url('/assets/images/backpic/back-2.webp');
  background-size: cover;
  background-position: center;
  border-bottom: 1px solid var(--border);
}
.cat-hero-inner {
  padding: 72px 0;
  width: 100%;
}
.cat-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.85);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 18px;
  box-shadow: 0 2px 8px rgba(31,56,88,0.04);
}
.cat-hero h1 {
  font-size: 34px;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.35;
  margin: 0 0 16px;
  max-width: 680px;
}
.cat-hero p {
  font-size: 16px;
  color: var(--text-body);
  line-height: 1.8;
  max-width: 560px;
  margin-bottom: 28px;
}
.cat-hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ===== Layout ===== */
.cat-layout-wrap { padding: 56px 0 72px; }
.cat-anchor-col { margin-bottom: 32px; }
.cat-anchor-nav {
  position: sticky;
  top: 130px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-card);
}
.cat-anchor-nav h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.cat-anchor-nav a {
  display: block;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--text-body);
  text-decoration: none;
  transition: var(--transition);
  margin-bottom: 2px;
}
.cat-anchor-nav a:hover {
  background: var(--primary-light);
  color: var(--primary);
}
.cat-anchor-nav a.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}
.cat-anchor-nav a i {
  width: 18px;
  color: var(--primary);
  font-size: 12px;
  margin-right: 6px;
  opacity: 0.7;
}

/* ===== Section Head ===== */
.cat-content { padding-bottom: 8px; }
.cat-section {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-card);
}
.section-head {
  margin-bottom: 26px;
}
.section-head .section-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.section-head h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.4;
  margin: 0 0 8px;
}
.section-head p {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.7;
  max-width: 620px;
}

/* ===== Compare Grid ===== */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.compare-col {
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--border);
  background: #fdfdfd;
}
.compare-col.compare-good {
  border-top: 3px solid var(--primary);
  background: #fff;
}
.compare-col.compare-bad {
  border-top: 3px solid var(--accent);
  background: #FBF8F3;
}
.compare-col h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.compare-col h3 i {
  font-size: 16px;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  color: var(--primary);
}
.compare-bad h3 i { background: #F4E8D7; color: var(--accent); }
.compare-col li {
  position: relative;
  padding: 7px 0 7px 24px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-body);
}
.compare-good li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
  font-size: 14px;
}
.compare-bad li::before {
  content: "×";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
  font-size: 14px;
}

/* ===== Table ===== */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.spec-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  background: #fff;
}
.spec-table th {
  background: var(--primary-light);
  color: var(--text-dark);
  font-weight: 600;
  font-size: 14px;
  text-align: left;
  padding: 14px 18px;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}
.spec-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-body);
  vertical-align: top;
}
.spec-table tr:last-child td { border-bottom: none; }
.spec-table tbody tr:hover td { background: #F8FBFE; }
.spec-table .td-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
  padding: 2px 10px;
  border-radius: 999px;
}

/* ===== Stats Strip ===== */
.stats-strip {
  background: linear-gradient(135deg, rgba(45,116,178,0.06) 0%, rgba(217,160,91,0.06) 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 48px 0;
  margin: 8px 0 56px;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-item { padding: 8px; }
.stat-num {
  font-size: 46px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
  letter-spacing: -1px;
}
.stat-item:nth-child(2) .stat-num { color: var(--accent); }
.stat-label {
  font-size: 14px;
  color: var(--text-body);
  margin-top: 6px;
}

/* ===== Flow ===== */
.flow-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.flow-step {
  position: relative;
  background: #FBFDFE;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px 22px;
  transition: var(--transition);
}
.flow-step:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  border-color: #C5D8EA;
}
.flow-num {
  font-size: 40px;
  font-weight: 700;
  color: var(--primary);
  opacity: 0.2;
  line-height: 1;
  margin-bottom: 14px;
}
.flow-step h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 8px;
}
.flow-step p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
}
.flow-arrow {
  position: absolute;
  top: 50%;
  right: -14px;
  transform: translateY(-50%);
  color: var(--primary);
  font-size: 14px;
  z-index: 2;
  background: var(--bg);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== Audience ===== */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.audience-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  background: #fff;
  transition: var(--transition);
}
.audience-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}
.audience-card .audience-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin-bottom: 14px;
}
.audience-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 8px;
}
.audience-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-body);
}

/* ===== FAQ ===== */
.faq-list { max-width: 900px; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 10px;
  background: #fff;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.active {
  border-color: #C5D8EA;
  box-shadow: 0 4px 14px rgba(31,56,88,0.06);
}
.faq-question {
  width: 100%;
  background: transparent;
  border: none;
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dark);
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-question .faq-icon {
  position: relative;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
.faq-question .faq-icon::before,
.faq-question .faq-icon::after {
  content: '';
  position: absolute;
  background: var(--primary);
  border-radius: 2px;
  transition: transform 0.3s ease;
}
.faq-question .faq-icon::before {
  width: 18px;
  height: 2px;
  top: 8px;
  left: 0;
}
.faq-question .faq-icon::after {
  width: 2px;
  height: 18px;
  left: 8px;
  top: 0;
}
.faq-item.active .faq-icon::after { transform: scaleY(0); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.faq-item.active .faq-answer { max-height: 300px; }
.faq-answer p {
  padding: 0 20px 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
  border-top: 1px dashed var(--border);
  padding-top: 14px;
}

/* ===== Related ===== */
.related-section {
  padding: 56px 0 72px;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.related-card {
  display: block;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
}
.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.related-card .related-img {
  height: 150px;
  overflow: hidden;
}
.related-card .related-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.related-card:hover .related-img img { transform: scale(1.04); }
.related-card .related-body { padding: 20px 22px 22px; }
.related-card .related-tag {
  font-size: 12px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 2px 10px;
  border-radius: 999px;
  display: inline-block;
  margin-bottom: 8px;
  font-weight: 600;
}
.related-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
}
.related-card p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
  margin-bottom: 12px;
}
.related-card .related-link {
  font-size: 14px;
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.related-card .related-link i { transition: transform 0.2s; }
.related-card:hover .related-link i { transform: translateX(4px); }

/* ===== CTA ===== */
.cta-section {
  background: #2D74B2;
  padding: 64px 0;
  text-align: center;
}
.cta-section h2 {
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}
.cta-section p {
  font-size: 15px;
  color: rgba(255,255,255,0.85);
  max-width: 560px;
  margin: 0 auto 28px;
  line-height: 1.7;
}
.cta-section .btn-accent {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}
.cta-section .btn-accent:hover {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 24px rgba(0,0,0,0.18);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 56px 0 0;
  font-size: 14px;
  line-height: 1.7;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-brand i {
  width: 30px;
  height: 30px;
  background: var(--primary);
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: #fff;
}
.footer-brand em { font-style: normal; color: var(--accent); }
.footer-about-text {
  font-size: 14px;
  color: var(--footer-text);
  max-width: 300px;
  line-height: 1.8;
}
.footer-col h4 {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul a {
  color: var(--footer-text);
  text-decoration: none;
  transition: var(--transition);
}
.footer-col ul a:hover { color: #fff; }
.footer-contact { margin: 0; padding: 0; list-style: none; }
.footer-contact li { margin-bottom: 10px; }
.footer-contact a { color: var(--footer-text); text-decoration: none; }
.footer-contact a:hover { color: #fff; }
.footer-bottom {
  padding: 20px 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: rgba(183,196,210,0.7);
}
.footer-bottom a {
  color: rgba(183,196,210,0.8);
  text-decoration: none;
}
.footer-bottom a:hover { color: #fff; }

/* ===== Responsive ===== */
@media screen and (max-width: 1024px) and (min-width: 641px) {
  .cat-anchor-col { display: none; }
  .cat-content { width: 100%; }
  .flow-grid { grid-template-columns: repeat(2, 1fr); }
  .audience-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(4, 1fr); }
}

@media screen and (max-width: 640px) {
  .container { padding: 0 16px; }
  .section-pad { padding: 56px 0; }

  .header-top-inner { gap: 12px; }
  .header-search { display: none; }
  .header-cta { display: none; }
  .menu-toggle { display: flex; }
  .brand-text { font-size: 18px; }

  .tab-nav { height: 44px; }
  .tab-nav-inner { height: 44px; padding: 0 8px; gap: 6px; }
  .tab-item { padding: 5px 14px; font-size: 13px; }

  .cat-hero { min-height: 360px; }
  .cat-hero-inner { padding: 44px 0; }
  .cat-hero h1 { font-size: 26px; line-height: 1.4; }
  .cat-hero p { font-size: 15px; }
  .cat-hero-actions { flex-direction: column; width: 100%; }
  .cat-hero-actions .btn { width: 100%; }

  .cat-layout-wrap { padding: 32px 0 48px; }
  .cat-anchor-col { display: none; }

  .cat-section { padding: 24px 20px; margin-bottom: 20px; }
  .section-head h2 { font-size: 22px; }

  .compare-grid { grid-template-columns: 1fr; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .stat-num { font-size: 36px; }

  .flow-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .flow-step { padding: 20px 16px; }
  .flow-arrow { display: none; }
  .flow-num { font-size: 34px; }

  .audience-grid { grid-template-columns: 1fr; }

  .related-grid { grid-template-columns: 1fr; }
  .related-card .related-img { height: 130px; }

  .cta-section { padding: 48px 0; }
  .cta-section h2 { font-size: 24px; }
  .cta-section p { font-size: 14px; }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; justify-content: center; text-align: center; }
}

@media screen and (max-width: 360px) {
  .brand-text { font-size: 16px; }
  .brand-icon { width: 32px; height: 32px; font-size: 14px; }
  .flow-grid { grid-template-columns: 1fr; }
  .stats-grid { gap: 12px; }
}