/* roulang page: index */
:root {
    --primary: #5B9BD5;
    --primary-dark: #4A8BC5;
    --primary-light: #E8F0FE;
    --secondary: #2C3E50;
    --secondary-light: #3A5068;
    --accent: #F39C12;
    --accent-dark: #E67E22;
    --bg-light: #F5F7FA;
    --bg-white: #FFFFFF;
    --bg-section: #F9FAFB;
    --text-primary: #2C3E50;
    --text-secondary: #555555;
    --text-muted: #999999;
    --text-white: #FFFFFF;
    --border-light: #E5E9EF;
    --radius-card: 12px;
    --radius-btn: 8px;
    --radius-input: 6px;
    --shadow-card: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-card-hover: 0 8px 20px rgba(0,0,0,0.12);
    --shadow-nav: 0 2px 8px rgba(0,0,0,0.06);
    --font-h1: 32px;
    --font-h2: 26px;
    --font-h3: 20px;
    --font-body: 16px;
    --font-small: 14px;
    --spacing-section: 60px;
    --spacing-section-tablet: 40px;
    --spacing-section-mobile: 30px;
    --nav-height: 56px;
    --countdown-height: 60px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; font-size: var(--font-body); line-height: 1.7; color: var(--text-secondary); background: var(--bg-white); -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }
a:focus { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 2px; }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea, select { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--text-primary); font-weight: 600; }
h1 { font-size: var(--font-h1); font-weight: 700; }
h2 { font-size: var(--font-h2); font-weight: 600; }
h3 { font-size: var(--font-h3); font-weight: 600; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; width: 100%; }
.section { padding: var(--spacing-section) 0; }
.section-alt { background: var(--bg-section); }
.section-light { background: var(--bg-light); }
.text-center { text-align: center; }
.section-title { margin-bottom: 40px; }
.section-title h2 { position: relative; display: inline-block; }
.section-title h2::after { content: ''; display: block; width: 50px; height: 3px; background: var(--primary); margin: 12px auto 0; border-radius: 2px; }
.section-title p { color: var(--text-muted); margin-top: 10px; font-size: var(--font-small); }
/* Navigation */
header { position: sticky; top: 0; z-index: 1000; background: var(--bg-white); box-shadow: var(--shadow-nav); height: var(--nav-height); }
header .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.logo { font-size: 22px; font-weight: 700; color: var(--text-primary); letter-spacing: 0.5px; display: flex; align-items: center; gap: 6px; }
.logo span { color: var(--primary); }
.logo .logo-sub { font-size: 13px; font-weight: 400; color: var(--text-muted); letter-spacing: 0; }
nav.main-nav { display: flex; align-items: center; gap: 8px; }
nav.main-nav a { padding: 8px 16px; font-size: 15px; font-weight: 500; color: var(--text-secondary); border-radius: 6px; transition: all 0.2s; position: relative; }
nav.main-nav a:hover { color: var(--primary); background: var(--primary-light); }
nav.main-nav a.active { color: var(--primary); background: var(--primary-light); font-weight: 600; }
nav.main-nav a.active::after { content: ''; position: absolute; bottom: 2px; left: 16px; right: 16px; height: 2px; background: var(--primary); border-radius: 1px; }
.mobile-toggle { display: none; font-size: 24px; color: var(--text-primary); background: none; border: none; cursor: pointer; padding: 4px 8px; border-radius: 4px; transition: background 0.2s; }
.mobile-toggle:hover { background: var(--bg-light); }
.mobile-toggle:focus { outline: 2px solid var(--primary); }
/* Countdown Bar */
.countdown-bar { background: var(--secondary); color: var(--text-white); height: var(--countdown-height); display: flex; align-items: center; justify-content: center; text-align: center; font-size: 18px; font-weight: 500; letter-spacing: 1px; position: relative; z-index: 999; }
.countdown-bar .countdown-label { margin-right: 12px; opacity: 0.9; }
.countdown-bar .countdown-timer { font-family: 'Courier New', monospace; font-size: 22px; font-weight: 700; letter-spacing: 2px; background: rgba(255,255,255,0.12); padding: 4px 16px; border-radius: 4px; display: inline-flex; align-items: center; gap: 4px; }
.countdown-bar .countdown-timer .cd-sep { opacity: 0.5; margin: 0 2px; }
/* Hero */
.hero { position: relative; min-height: 520px; display: flex; align-items: center; justify-content: center; text-align: center; overflow: hidden; background: var(--secondary); }
.hero-bg { position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat; opacity: 0.45; transform: scale(1.05); transition: transform 8s ease; }
.hero:hover .hero-bg { transform: scale(1.0); }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(44,62,80,0.75) 0%, rgba(44,62,80,0.4) 100%); }
.hero-content { position: relative; z-index: 2; max-width: 800px; padding: 40px 20px; }
.hero-content h1 { font-size: 38px; font-weight: 700; color: var(--text-white); margin-bottom: 16px; text-shadow: 0 2px 12px rgba(0,0,0,0.25); letter-spacing: 1px; }
.hero-content .hero-sub { font-size: 20px; color: rgba(255,255,255,0.9); font-weight: 400; text-shadow: 0 1px 6px rgba(0,0,0,0.2); margin-bottom: 28px; }
.hero-content .hero-cta { display: inline-flex; gap: 16px; flex-wrap: wrap; justify-content: center; }
.hero-content .hero-cta .btn { padding: 14px 32px; font-size: 17px; font-weight: 600; border-radius: var(--radius-btn); transition: all 0.25s; cursor: pointer; border: none; }
.hero-content .hero-cta .btn-primary { background: var(--accent); color: var(--text-white); box-shadow: 0 4px 14px rgba(243,156,18,0.35); }
.hero-content .hero-cta .btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(243,156,18,0.45); }
.hero-content .hero-cta .btn-primary:active { transform: translateY(0) scale(0.98); }
.hero-content .hero-cta .btn-outline { background: transparent; color: var(--text-white); border: 2px solid rgba(255,255,255,0.7); }
.hero-content .hero-cta .btn-outline:hover { background: rgba(255,255,255,0.12); border-color: var(--text-white); transform: translateY(-2px); }
/* Highlights Grid */
.highlights-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 10px; }
.highlight-card { background: var(--bg-white); border-radius: var(--radius-card); box-shadow: var(--shadow-card); overflow: hidden; transition: all 0.3s; cursor: default; }
.highlight-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-4px); }
.highlight-card .card-img { height: 200px; overflow: hidden; background: var(--bg-light); }
.highlight-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.highlight-card:hover .card-img img { transform: scale(1.06); }
.highlight-card .card-body { padding: 20px 22px 24px; }
.highlight-card .card-body h3 { font-size: 18px; margin-bottom: 8px; color: var(--text-primary); }
.highlight-card .card-body p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.highlight-card.featured { grid-column: span 1; }
.highlight-card.featured .card-img { height: 240px; }
.highlight-card.tall { grid-row: span 2; }
.highlight-card.tall .card-img { height: 300px; }
/* Responsive highlights: on tablet+ */
@media (min-width: 1025px) {
    .highlights-grid { grid-template-columns: 1fr 1fr 1fr; grid-auto-rows: auto; }
    .highlight-card.featured { grid-column: span 2; grid-row: span 1; }
    .highlight-card.tall { grid-row: span 2; }
}
/* CTA Section */
.cta-section { background: var(--secondary); position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.webp') center center / cover no-repeat; opacity: 0.1; }
.cta-section .container { position: relative; z-index: 1; }
.cta-section h2 { color: var(--text-white); }
.cta-section p { color: rgba(255,255,255,0.8); }
.cta-form { max-width: 600px; margin: 30px auto 0; display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }
.cta-form input { flex: 1 1 180px; padding: 12px 18px; border-radius: var(--radius-input); border: none; font-size: 15px; background: rgba(255,255,255,0.95); color: var(--text-primary); min-width: 0; }
.cta-form input:focus { outline: 2px solid var(--accent); background: var(--bg-white); }
.cta-form .btn-cta { padding: 12px 32px; background: var(--accent); color: var(--text-white); font-weight: 600; font-size: 16px; border: none; border-radius: var(--radius-btn); cursor: pointer; transition: all 0.25s; white-space: nowrap; }
.cta-form .btn-cta:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 4px 16px rgba(243,156,18,0.35); }
.cta-form .btn-cta:active { transform: translateY(0) scale(0.98); }
.cta-form .btn-cta:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
/* News List */
.news-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.news-card { background: var(--bg-white); border-radius: var(--radius-card); box-shadow: var(--shadow-card); overflow: hidden; transition: all 0.3s; border: 1px solid var(--border-light); }
.news-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-3px); }
.news-card .news-body { padding: 18px 20px 20px; }
.news-card .news-tag { display: inline-block; padding: 2px 12px; border-radius: 20px; font-size: 12px; font-weight: 500; background: var(--primary-light); color: var(--primary); margin-bottom: 10px; }
.news-card .news-title { font-size: 17px; font-weight: 600; color: var(--text-primary); margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card .news-title a { color: var(--text-primary); transition: color 0.2s; }
.news-card .news-title a:hover { color: var(--primary); }
.news-card .news-summary { font-size: 14px; color: var(--text-secondary); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 12px; }
.news-card .news-meta { display: flex; align-items: center; justify-content: space-between; font-size: 13px; color: var(--text-muted); border-top: 1px solid var(--border-light); padding-top: 12px; }
.news-card .news-meta .news-date { display: flex; align-items: center; gap: 4px; }
.news-card .news-meta .news-link { color: var(--primary); font-weight: 500; }
.news-card .news-meta .news-link:hover { text-decoration: underline; }
.news-empty { text-align: center; padding: 60px 20px; color: var(--text-muted); font-size: 16px; background: var(--bg-light); border-radius: var(--radius-card); }
/* FAQ Accordion */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border: 1px solid var(--border-light); border-radius: var(--radius-card); margin-bottom: 12px; overflow: hidden; background: var(--bg-white); transition: box-shadow 0.2s; }
.faq-item:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.05); }
.faq-question { display: flex; align-items: center; justify-content: space-between; padding: 16px 22px; cursor: pointer; background: var(--bg-white); border: none; width: 100%; text-align: left; font-size: 16px; font-weight: 500; color: var(--text-primary); transition: background 0.2s; }
.faq-question:hover { background: var(--bg-light); }
.faq-question:focus { outline: 2px solid var(--primary); outline-offset: -2px; }
.faq-question .faq-icon { font-size: 18px; color: var(--primary); transition: transform 0.3s; flex-shrink: 0; margin-left: 12px; }
.faq-item.active .faq-question .faq-icon { transform: rotate(45deg); color: var(--accent); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; padding: 0 22px; }
.faq-item.active .faq-answer { max-height: 300px; padding: 0 22px 18px; }
.faq-answer p { font-size: 15px; color: var(--text-secondary); line-height: 1.7; }
/* Footer */
footer { background: var(--secondary); color: rgba(255,255,255,0.85); padding: 48px 0 0; }
footer .footer-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 40px; margin-bottom: 32px; }
footer h4 { color: var(--text-white); font-size: 17px; font-weight: 600; margin-bottom: 16px; }
footer p, footer a { font-size: 14px; color: rgba(255,255,255,0.7); line-height: 1.8; }
footer a:hover { color: var(--text-white); }
footer .footer-links li { margin-bottom: 6px; }
footer .footer-links a { display: inline-flex; align-items: center; gap: 6px; }
footer .footer-links a i { font-size: 12px; color: var(--primary); }
footer .footer-contact li { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 10px; }
footer .footer-contact li i { color: var(--primary); margin-top: 4px; min-width: 16px; }
footer .footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); padding: 18px 0; text-align: center; font-size: 13px; color: rgba(255,255,255,0.5); }
footer .footer-bottom a { color: rgba(255,255,255,0.6); }
footer .footer-bottom a:hover { color: var(--text-white); }
/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 24px; border-radius: var(--radius-btn); font-weight: 500; font-size: 15px; transition: all 0.25s; cursor: pointer; border: none; text-align: center; justify-content: center; }
.btn-primary-solid { background: var(--primary); color: var(--text-white); }
.btn-primary-solid:hover { background: var(--primary-dark); color: var(--text-white); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(91,155,213,0.3); }
.btn-outline-primary { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-outline-primary:hover { background: var(--primary-light); transform: translateY(-1px); }
.btn-sm { padding: 6px 16px; font-size: 13px; }
/* Responsive */
@media (max-width: 1024px) {
    :root { --font-h1: 28px; --spacing-section: var(--spacing-section-tablet); }
    .hero-content h1 { font-size: 32px; }
    .hero-content .hero-sub { font-size: 18px; }
    nav.main-nav { display: none; }
    .mobile-toggle { display: flex; align-items: center; justify-content: center; }
    nav.main-nav.open { display: flex; flex-direction: column; position: absolute; top: var(--nav-height); left: 0; right: 0; background: var(--bg-white); box-shadow: 0 8px 24px rgba(0,0,0,0.12); padding: 12px 20px 20px; gap: 4px; border-top: 1px solid var(--border-light); }
    nav.main-nav.open a { padding: 12px 16px; width: 100%; border-radius: 6px; }
    nav.main-nav.open a.active::after { display: none; }
    nav.main-nav.open a.active { background: var(--primary-light); }
    .highlights-grid { grid-template-columns: 1fr 1fr; }
    footer .footer-grid { grid-template-columns: 1fr 1fr; }
    .countdown-bar { font-size: 15px; height: 52px; }
    .countdown-bar .countdown-timer { font-size: 18px; padding: 2px 12px; }
}
@media (max-width: 640px) {
    :root { --font-h1: 24px; --font-h2: 20px; --font-h3: 17px; --spacing-section: var(--spacing-section-mobile); }
    .hero { min-height: 380px; }
    .hero-content h1 { font-size: 24px; }
    .hero-content .hero-sub { font-size: 15px; margin-bottom: 20px; }
    .hero-content .hero-cta .btn { padding: 10px 22px; font-size: 15px; }
    .highlights-grid { grid-template-columns: 1fr; }
    .highlight-card.featured { grid-column: span 1; }
    .highlight-card.tall { grid-row: span 1; }
    .highlight-card .card-img { height: 180px; }
    .highlight-card.featured .card-img { height: 200px; }
    .cta-form { flex-direction: column; }
    .cta-form input { flex: 1 1 auto; width: 100%; }
    .cta-form .btn-cta { width: 100%; }
    .news-grid { grid-template-columns: 1fr; }
    footer .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .countdown-bar { font-size: 13px; height: 46px; flex-wrap: wrap; padding: 0 10px; }
    .countdown-bar .countdown-label { margin-right: 6px; }
    .countdown-bar .countdown-timer { font-size: 15px; padding: 2px 10px; }
    .faq-question { padding: 14px 16px; font-size: 15px; }
    .faq-answer { padding: 0 16px; }
    .faq-item.active .faq-answer { padding: 0 16px 14px; }
    .section-title { margin-bottom: 24px; }
    .container { padding: 0 16px; }
}
@media (max-width: 360px) {
    .hero-content h1 { font-size: 20px; }
    .hero-content .hero-sub { font-size: 13px; }
    .countdown-bar .countdown-timer { font-size: 13px; letter-spacing: 1px; }
}
/* Utility */
.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.gap-8 { gap: 8px; }
.flex-center { display: flex; align-items: center; justify-content: center; }
/* Accessibility skip link */
.skip-link { position: absolute; top: -100%; left: 8px; background: var(--primary); color: var(--text-white); padding: 8px 16px; border-radius: 4px; z-index: 10000; font-weight: 600; }
.skip-link:focus { top: 8px; }

/* roulang page: article */
:root {
            --primary: #5B9BD5;
            --primary-dark: #4A8BC7;
            --secondary: #2C3E50;
            --secondary-light: #3A506E;
            --accent: #F39C12;
            --accent-dark: #E67E22;
            --bg-light: #F5F7FA;
            --bg-card: #FFFFFF;
            --text-primary: #2C3E50;
            --text-body: #555555;
            --text-muted: #999999;
            --border-light: #E8ECF1;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-input: 6px;
            --shadow-card: 0 4px 12px rgba(0,0,0,0.08);
            --shadow-hover: 0 8px 20px rgba(0,0,0,0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-base: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --container-max: 1200px;
        }

        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-base);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-body);
            background: #FFFFFF;
            -webkit-font-smoothing: antialiased;
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover, a:focus { color: var(--primary-dark); outline: none; }
        a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-card); }
        ul, ol { list-style: none; }
        .container { max-width: var(--container-max); margin: 0 auto; padding: 0 20px; }
        .text-center { text-align: center; }

        /* Header & Navigation */
        .site-header {
            background: #FFFFFF;
            box-shadow: 0 2px 12px rgba(0,0,0,0.06);
            position: sticky;
            top: 0;
            z-index: 1000;
            height: 56px;
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .logo-text {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }
        .logo-text span { color: var(--primary); }
        .logo-suffix {
            font-size: 12px;
            color: var(--text-muted);
            font-weight: 400;
            letter-spacing: 0.3px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .main-nav a {
            padding: 8px 16px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            border-radius: 6px;
            transition: var(--transition);
        }
        .main-nav a:hover {
            color: var(--primary);
            background: rgba(91,155,213,0.08);
        }
        .main-nav a.active {
            color: #FFFFFF;
            background: var(--primary);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text-primary);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
            transition: var(--transition);
        }
        .hamburger:hover { background: var(--bg-light); }

        /* Breadcrumb */
        .breadcrumb-wrap {
            background: var(--bg-light);
            padding: 14px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .breadcrumb {
            font-size: 14px;
            color: var(--text-muted);
        }
        .breadcrumb a { color: var(--text-muted); }
        .breadcrumb a:hover { color: var(--primary); }
        .breadcrumb .sep { margin: 0 8px; color: #ccc; }

        /* Article Main */
        .article-section {
            padding: 50px 0 70px;
        }
        .article-header {
            margin-bottom: 36px;
        }
        .article-header h1 {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.25;
            margin-bottom: 16px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 14px;
            color: var(--text-muted);
            align-items: center;
        }
        .article-meta i { margin-right: 5px; color: var(--primary); }
        .article-meta .category-tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 20px;
            background: rgba(91,155,213,0.12);
            color: var(--primary);
            font-size: 13px;
            font-weight: 500;
        }
        .article-body {
            font-size: 16px;
            line-height: 1.85;
            color: var(--text-body);
        }
        .article-body h2 { font-size: 24px; font-weight: 600; color: var(--text-primary); margin: 36px 0 16px; }
        .article-body h3 { font-size: 20px; font-weight: 600; color: var(--text-primary); margin: 28px 0 12px; }
        .article-body p { margin-bottom: 18px; }
        .article-body ul, .article-body ol { margin: 0 0 18px 24px; list-style: disc; }
        .article-body ol { list-style: decimal; }
        .article-body li { margin-bottom: 8px; line-height: 1.7; }
        .article-body img { margin: 24px auto; border-radius: var(--radius-card); box-shadow: var(--shadow-card); }
        .article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
        .article-body a:hover { color: var(--accent-dark); }

        .article-not-found {
            text-align: center;
            padding: 80px 20px;
        }
        .article-not-found i { font-size: 56px; color: #ddd; margin-bottom: 20px; }
        .article-not-found h2 { font-size: 24px; color: var(--text-primary); margin-bottom: 12px; }
        .article-not-found p { color: var(--text-muted); margin-bottom: 24px; }
        .btn-back-home {
            display: inline-block;
            padding: 12px 28px;
            background: var(--primary);
            color: #FFF;
            border-radius: var(--radius-btn);
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-back-home:hover { background: var(--primary-dark); color: #FFF; }

        /* Related Posts */
        .related-section {
            background: var(--bg-light);
            padding: 50px 0 60px;
        }
        .related-section h2 {
            font-size: 26px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 30px;
            text-align: center;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            padding: 24px;
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .related-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
        .related-card h3 { font-size: 17px; font-weight: 600; color: var(--text-primary); margin-bottom: 8px; line-height: 1.4; }
        .related-card h3 a { color: var(--text-primary); }
        .related-card h3 a:hover { color: var(--primary); }
        .related-card .date { font-size: 13px; color: var(--text-muted); }

        /* Footer */
        .site-footer {
            background: var(--secondary);
            color: rgba(255,255,255,0.9);
            padding: 50px 0 0;
            font-size: 15px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 30px;
        }
        .footer-grid h4 {
            font-size: 18px;
            font-weight: 600;
            color: #FFF;
            margin-bottom: 18px;
            letter-spacing: 0.5px;
        }
        .footer-grid p { font-size: 14px; line-height: 1.7; color: rgba(255,255,255,0.7); }
        .footer-links li { margin-bottom: 10px; }
        .footer-links a {
            color: rgba(255,255,255,0.7);
            font-size: 14px;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .footer-links a i { font-size: 10px; color: var(--primary); }
        .footer-links a:hover { color: #FFF; padding-left: 4px; }
        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
            font-size: 14px;
            color: rgba(255,255,255,0.7);
        }
        .footer-contact i { width: 16px; color: var(--primary); font-size: 14px; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding: 20px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: #FFF; }

        /* Mobile Navigation */
        .mobile-menu-overlay {
            display: none;
            position: fixed;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0,0,0,0.5);
            z-index: 2000;
            opacity: 0;
            transition: opacity var(--transition);
        }
        .mobile-menu-overlay.open { display: block; opacity: 1; }
        .mobile-menu-panel {
            position: fixed;
            top: 0; right: -280px;
            width: 280px;
            height: 100%;
            background: #FFF;
            z-index: 2001;
            padding: 24px 20px;
            box-shadow: -4px 0 20px rgba(0,0,0,0.1);
            transition: right var(--transition);
            overflow-y: auto;
        }
        .mobile-menu-panel.open { right: 0; }
        .mobile-menu-close {
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text-primary);
            cursor: pointer;
            margin-bottom: 24px;
            display: block;
            margin-left: auto;
        }
        .mobile-nav a {
            display: block;
            padding: 12px 16px;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-body);
            border-radius: 8px;
            margin-bottom: 4px;
            transition: var(--transition);
        }
        .mobile-nav a:hover { background: var(--bg-light); color: var(--primary); }
        .mobile-nav a.active { background: var(--primary); color: #FFF; }

        /* Responsive */
        @media screen and (max-width: 1024px) {
            .main-nav { display: none; }
            .hamburger { display: block; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
            .related-grid { grid-template-columns: 1fr 1fr; }
        }
        @media screen and (max-width: 768px) {
            .article-header h1 { font-size: 26px; }
            .article-section { padding: 30px 0 50px; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .article-meta { flex-direction: column; gap: 8px; }
            .breadcrumb-wrap { padding: 10px 0; font-size: 13px; }
        }
        @media screen and (max-width: 520px) {
            .article-header h1 { font-size: 22px; }
            .article-body { font-size: 15px; }
            .container { padding: 0 16px; }
            .logo-text { font-size: 18px; }
            .logo-suffix { display: none; }
        }

        /* Foundation Overrides */
        .grid-container { padding-left: 0; padding-right: 0; max-width: var(--container-max); }
        .grid-x { margin-left: 0; margin-right: 0; }
        .cell { padding-left: 0; padding-right: 0; }

        /* Print */
        @media print {
            .site-header, .site-footer, .related-section, .breadcrumb-wrap { display: none; }
            .article-section { padding: 20px 0; }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #5B9BD5;
            --primary-dark: #4A8BC5;
            --primary-light: #E8F0FE;
            --secondary: #2C3E50;
            --secondary-light: #3A5068;
            --accent: #F39C12;
            --accent-dark: #E67E22;
            --bg-light: #F5F7FA;
            --bg-white: #FFFFFF;
            --bg-card: #FFFFFF;
            --text-dark: #2C3E50;
            --text-body: #555555;
            --text-light: #999999;
            --text-white: #FFFFFF;
            --border-color: #E5E9F0;
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 16px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
            --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.15);
            --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --container-max: 1200px;
            --nav-height: 64px;
            --gap-section: 80px;
            --gap-section-mobile: 48px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-white);
            overflow-x: hidden;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover,
        a:focus {
            color: var(--primary-dark);
            outline: none;
        }
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 2px;
        }

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            transition: var(--transition);
        }

        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--text-dark);
            font-weight: 600;
            line-height: 1.3;
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }

        @media screen and (min-width: 640px) {
            .container {
                padding: 0 30px;
            }
        }

        @media screen and (min-width: 1024px) {
            .container {
                padding: 0 40px;
            }
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
            height: var(--nav-height);
            transition: var(--transition);
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-dark);
            letter-spacing: -0.3px;
            flex-shrink: 0;
        }
        .logo .logo-highlight {
            color: var(--primary);
        }
        .logo .logo-sub {
            font-size: 13px;
            font-weight: 400;
            color: var(--text-light);
            letter-spacing: 0;
            margin-left: 2px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            border-radius: var(--radius-md);
            transition: var(--transition);
            position: relative;
            white-space: nowrap;
        }

        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
            transition: var(--transition);
        }

        .main-nav a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .main-nav a:hover::after {
            width: 60%;
        }

        .main-nav a.active {
            color: var(--primary);
            background: var(--primary-light);
        }
        .main-nav a.active::after {
            width: 60%;
        }

        .main-nav a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        /* Hamburger */
        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 40px;
            height: 40px;
            border: none;
            background: transparent;
            cursor: pointer;
            border-radius: var(--radius-sm);
            gap: 5px;
            padding: 6px;
        }
        .hamburger span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--text-dark);
            border-radius: 3px;
            transition: var(--transition);
        }
        .hamburger:hover span {
            background: var(--primary);
        }
        .hamburger.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        /* Mobile Nav Overlay */
        .mobile-nav-overlay {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(44, 62, 80, 0.97);
            z-index: 999;
            flex-direction: column;
            align-items: center;
            justify-content: flex-start;
            padding: 40px 20px;
            gap: 8px;
            overflow-y: auto;
            animation: fadeInDown 0.3s ease;
        }

        .mobile-nav-overlay.open {
            display: flex;
        }

        .mobile-nav-overlay a {
            display: block;
            width: 100%;
            max-width: 320px;
            padding: 16px 24px;
            font-size: 18px;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.85);
            text-align: center;
            border-radius: var(--radius-md);
            transition: var(--transition);
            border: 1px solid transparent;
        }

        .mobile-nav-overlay a:hover,
        .mobile-nav-overlay a.active {
            background: rgba(91, 155, 213, 0.25);
            color: #fff;
            border-color: rgba(91, 155, 213, 0.4);
        }

        @keyframes fadeInDown {
            from {
                opacity: 0;
                transform: translateY(-12px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ===== Page Hero ===== */
        .page-hero {
            margin-top: var(--nav-height);
            position: relative;
            min-height: 340px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--secondary);
            overflow: hidden;
        }

        .page-hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.35;
            transition: var(--transition);
        }

        .page-hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(44, 62, 80, 0.85) 0%, rgba(44, 62, 80, 0.5) 100%);
        }

        .page-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 60px 20px;
        }

        .page-hero h1 {
            font-size: 36px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
        }

        .page-hero .hero-sub {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.6;
            font-weight: 400;
        }

        .page-hero .breadcrumb {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 8px;
            margin-bottom: 24px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            flex-wrap: wrap;
        }

        .page-hero .breadcrumb a {
            color: rgba(255, 255, 255, 0.8);
            transition: var(--transition);
        }
        .page-hero .breadcrumb a:hover {
            color: #fff;
        }
        .page-hero .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.4);
        }
        .page-hero .breadcrumb .current {
            color: var(--accent);
            font-weight: 500;
        }

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

        .section-alt {
            background: var(--bg-light);
        }

        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-title h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }

        .section-title p {
            font-size: 17px;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
        }

        .section-title .title-accent {
            display: inline-block;
            width: 50px;
            height: 4px;
            background: var(--primary);
            border-radius: 3px;
            margin-top: 14px;
        }

        /* ===== Feature Grid ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 28px;
        }

        @media screen and (min-width: 640px) {
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media screen and (min-width: 1024px) {
            .feature-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--primary);
            opacity: 0;
            transition: var(--transition);
        }

        .feature-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: transparent;
        }
        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-card .icon-wrap {
            width: 56px;
            height: 56px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-light);
            border-radius: var(--radius-md);
            margin-bottom: 18px;
            font-size: 26px;
            color: var(--primary);
            transition: var(--transition);
        }

        .feature-card:hover .icon-wrap {
            background: var(--primary);
            color: #fff;
        }

        .feature-card h3 {
            font-size: 19px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 10px;
        }

        .feature-card p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* ===== Module Showcase ===== */
        .module-showcase {
            display: grid;
            grid-template-columns: 1fr;
            gap: 32px;
            align-items: center;
        }

        @media screen and (min-width: 768px) {
            .module-showcase {
                grid-template-columns: 1fr 1fr;
            }
        }

        .module-showcase.reverse {
            direction: rtl;
        }
        .module-showcase.reverse>* {
            direction: ltr;
        }

        .module-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: var(--transition);
        }

        .module-image:hover {
            box-shadow: var(--shadow-hover);
            transform: scale(1.01);
        }

        .module-image img {
            width: 100%;
            height: auto;
            display: block;
        }

        .module-content h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 16px;
        }

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

        .module-content ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-top: 16px;
        }

        .module-content ul li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 15px;
            color: var(--text-body);
        }

        .module-content ul li i {
            color: var(--primary);
            font-size: 14px;
            margin-top: 4px;
            flex-shrink: 0;
        }

        /* ===== Process Timeline ===== */
        .process-steps {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
            counter-reset: step;
        }

        @media screen and (min-width: 640px) {
            .process-steps {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media screen and (min-width: 1024px) {
            .process-steps {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        .process-step {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            text-align: center;
            transition: var(--transition);
            position: relative;
            counter-increment: step;
        }

        .process-step:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }

        .process-step .step-num {
            width: 48px;
            height: 48px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 20px;
            font-weight: 700;
            border-radius: 50%;
            margin: 0 auto 16px;
            transition: var(--transition);
        }

        .process-step:hover .step-num {
            background: var(--primary);
            color: #fff;
        }

        .process-step h4 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 8px;
        }

        .process-step p {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.6;
            margin-bottom: 0;
        }

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

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.1;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .cta-section h2 {
            font-size: 30px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }

        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.8);
            max-width: 580px;
            margin: 0 auto 28px;
            line-height: 1.6;
        }

        .cta-btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 32px;
            font-size: 16px;
            font-weight: 600;
            border-radius: var(--radius-md);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            line-height: 1.4;
        }

        .btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
        }

        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 14px rgba(243, 156, 18, 0.35);
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            color: #fff;
            box-shadow: 0 6px 20px rgba(243, 156, 18, 0.45);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: translateY(0) scale(0.98);
        }

        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.4);
        }
        .btn-outline:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0) scale(0.98);
        }

        .btn-sm {
            padding: 10px 22px;
            font-size: 14px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-sm);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            cursor: pointer;
            gap: 12px;
            user-select: none;
            transition: var(--transition);
        }

        .faq-question h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            margin: 0;
            flex: 1;
        }

        .faq-question .faq-icon {
            font-size: 16px;
            color: var(--primary);
            flex-shrink: 0;
            transition: var(--transition);
            width: 24px;
            text-align: center;
        }

        .faq-item.open .faq-question .faq-icon {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
        }

        .faq-item.open .faq-answer {
            max-height: 400px;
        }

        .faq-answer p {
            padding: 0 24px 18px;
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.7;
            margin: 0;
        }

        /* ===== Data Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        @media screen and (min-width: 640px) {
            .stats-grid {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        .stat-item {
            text-align: center;
            padding: 28px 16px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .stat-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }

        .stat-item .stat-num {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 6px;
        }

        .stat-item .stat-label {
            font-size: 15px;
            color: var(--text-body);
            font-weight: 500;
        }

        /* ===== Footer ===== */
        footer {
            background: var(--secondary);
            color: rgba(255, 255, 255, 0.85);
            padding: 56px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 36px;
        }

        @media screen and (min-width: 640px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media screen and (min-width: 1024px) {
            .footer-grid {
                grid-template-columns: 2fr 1fr 1fr;
            }
        }

        footer h4 {
            font-size: 18px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: -0.2px;
        }

        footer p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.7;
            margin-bottom: 0;
        }

        .footer-links,
        .footer-contact {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links li a,
        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            transition: var(--transition);
        }

        .footer-links li a i {
            font-size: 10px;
            color: var(--primary);
            transition: var(--transition);
        }

        .footer-links li a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-links li a:hover i {
            color: var(--accent);
        }

        .footer-contact li i {
            color: var(--primary);
            width: 18px;
            text-align: center;
            font-size: 14px;
        }

        .footer-contact li span {
            color: rgba(255, 255, 255, 0.7);
        }

        .footer-bottom {
            margin-top: 40px;
            padding: 18px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.6);
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== Responsive ===== */
        @media screen and (max-width: 1024px) {
            .main-nav {
                display: none;
            }
            .hamburger {
                display: flex;
            }

            .page-hero h1 {
                font-size: 28px;
            }
            .page-hero .hero-sub {
                font-size: 16px;
            }

            .section-title h2 {
                font-size: 26px;
            }
        }

        @media screen and (max-width: 640px) {
            :root {
                --gap-section: 48px;
                --nav-height: 56px;
            }

            .page-hero {
                min-height: 240px;
            }
            .page-hero .container {
                padding: 40px 16px;
            }
            .page-hero h1 {
                font-size: 24px;
            }
            .page-hero .hero-sub {
                font-size: 15px;
            }
            .page-hero .breadcrumb {
                font-size: 13px;
                gap: 6px;
            }

            .section-title h2 {
                font-size: 22px;
            }

            .feature-card {
                padding: 24px 20px;
            }

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

            .process-step {
                padding: 20px 16px;
            }

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

            .btn {
                padding: 12px 24px;
                font-size: 15px;
            }

            .stats-grid {
                gap: 12px;
            }
            .stat-item .stat-num {
                font-size: 28px;
            }

            .footer-grid {
                gap: 28px;
            }
            footer {
                padding: 40px 0 0;
            }

            .faq-question {
                padding: 14px 16px;
            }
            .faq-answer p {
                padding: 0 16px 14px;
            }

            .logo {
                font-size: 18px;
            }
            .logo .logo-sub {
                font-size: 11px;
            }
        }

        @media screen and (max-width: 420px) {
            .page-hero h1 {
                font-size: 20px;
            }
            .page-hero .hero-sub {
                font-size: 14px;
            }

            .section-title h2 {
                font-size: 20px;
            }

            .feature-grid {
                gap: 16px;
            }
            .feature-card {
                padding: 20px 16px;
            }

            .process-steps {
                gap: 12px;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-20 {
            margin-top: 20px;
        }
        .mb-20 {
            margin-bottom: 20px;
        }
        .gap-16 {
            gap: 16px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* Foundation override */
        .grid-container {
            max-width: var(--container-max);
            padding-left: 20px;
            padding-right: 20px;
        }
        @media screen and (min-width: 640px) {
            .grid-container {
                padding-left: 30px;
                padding-right: 30px;
            }
        }
        @media screen and (min-width: 1024px) {
            .grid-container {
                padding-left: 40px;
                padding-right: 40px;
            }
        }

/* roulang page: category2 */
/* ===== CSS 设计变量 ===== */
        :root {
            --primary: #5B9BD5;
            --primary-dark: #4A8BC5;
            --primary-light: #E8F0FE;
            --secondary: #2C3E50;
            --secondary-light: #3D5166;
            --accent: #F39C12;
            --accent-dark: #E67E22;
            --bg-light: #F5F7FA;
            --bg-white: #FFFFFF;
            --bg-alt: #F9FAFB;
            --text-primary: #2C3E50;
            --text-body: #555555;
            --text-muted: #999999;
            --text-white: #FFFFFF;
            --border-light: #E5E9F0;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-input: 6px;
            --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-card-hover: 0 8px 20px rgba(0, 0, 0, 0.12);
            --shadow-nav: 0 2px 12px rgba(0, 0, 0, 0.06);
            --transition: 0.3s ease;
            --font-base: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

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

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

        ul,
        ol {
            list-style: none;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .section-padding {
            padding: 80px 0;
        }

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

        /* ===== 导航 ===== */
        .site-header {
            background: var(--bg-white);
            box-shadow: var(--shadow-nav);
            position: sticky;
            top: 0;
            z-index: 1000;
            height: 64px;
            display: flex;
            align-items: center;
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }

        .logo {
            font-size: 22px;
            font-weight: 700;
            color: var(--secondary);
            display: flex;
            align-items: center;
            gap: 4px;
            flex-shrink: 0;
        }
        .logo .logo-highlight {
            color: var(--primary);
        }
        .logo .logo-sub {
            font-size: 13px;
            font-weight: 400;
            color: var(--text-muted);
            margin-left: 2px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .main-nav a {
            padding: 8px 16px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            border-radius: var(--radius-btn);
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }
        .main-nav a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .main-nav a.active {
            background: var(--primary);
            color: var(--text-white);
        }
        .main-nav a.active:hover {
            background: var(--primary-dark);
        }

        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 26px;
            color: var(--secondary);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 4px;
            transition: background var(--transition);
        }
        .hamburger:hover {
            background: var(--bg-light);
        }

        /* 移动端导航遮罩 */
        .mobile-nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.45);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition);
        }
        .mobile-nav-overlay.open {
            opacity: 1;
        }

        .mobile-nav-panel {
            position: fixed;
            top: 0;
            right: -300px;
            width: 280px;
            height: 100%;
            background: var(--bg-white);
            z-index: 1001;
            box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
            padding: 80px 28px 30px;
            transition: right 0.35s ease;
            overflow-y: auto;
        }
        .mobile-nav-panel.open {
            right: 0;
        }
        .mobile-nav-panel .close-btn {
            position: absolute;
            top: 16px;
            right: 20px;
            background: none;
            border: none;
            font-size: 28px;
            color: var(--secondary);
            cursor: pointer;
        }
        .mobile-nav-panel a {
            display: block;
            padding: 14px 0;
            font-size: 17px;
            font-weight: 500;
            color: var(--text-body);
            border-bottom: 1px solid var(--border-light);
            transition: color var(--transition);
        }
        .mobile-nav-panel a:hover {
            color: var(--primary);
        }
        .mobile-nav-panel a.active {
            color: var(--primary);
            font-weight: 600;
        }

        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            min-height: 480px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: linear-gradient(135deg, rgba(44, 62, 80, 0.82), rgba(44, 62, 80, 0.60)), url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            padding: 80px 20px;
        }
        .hero-content {
            max-width: 800px;
            position: relative;
            z-index: 2;
        }
        .hero-content h1 {
            font-size: 42px;
            font-weight: 700;
            color: var(--text-white);
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
        }
        .hero-content h1 .hero-highlight {
            color: var(--accent);
        }
        .hero-content p {
            font-size: 20px;
            color: rgba(255, 255, 255, 0.92);
            line-height: 1.6;
            max-width: 680px;
            margin: 0 auto 30px;
        }
        .hero-content .hero-cta {
            display: inline-block;
            padding: 16px 38px;
            font-size: 17px;
            font-weight: 600;
            color: var(--text-white);
            background: var(--accent);
            border-radius: var(--radius-btn);
            transition: background var(--transition), transform var(--transition);
            box-shadow: 0 4px 14px rgba(243, 156, 18, 0.35);
        }
        .hero-content .hero-cta:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            color: var(--text-white);
        }
        .hero-content .hero-cta:active {
            transform: scale(0.98);
        }

        /* ===== 板块标题 ===== */
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        .section-title h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 14px;
            line-height: 1.25;
        }
        .section-title p {
            font-size: 17px;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.6;
        }
        .section-title .title-accent {
            display: inline-block;
            width: 50px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
            margin-top: 12px;
        }

        /* ===== 核心优势卡片 ===== */
        .advantages-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }
        .advantage-card {
            background: var(--bg-white);
            border-radius: var(--radius-card);
            padding: 36px 30px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            transition: box-shadow var(--transition), transform var(--transition);
            display: flex;
            flex-direction: column;
        }
        .advantage-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
        }
        .advantage-card .icon-wrap {
            width: 56px;
            height: 56px;
            background: var(--primary-light);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            color: var(--primary);
            margin-bottom: 20px;
            flex-shrink: 0;
        }
        .advantage-card h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--secondary);
            margin-bottom: 12px;
        }
        .advantage-card p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.7;
            flex: 1;
        }

        /* ===== 行业覆盖网格 ===== */
        .industry-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .industry-item {
            background: var(--bg-white);
            border-radius: var(--radius-card);
            padding: 30px 20px;
            text-align: center;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            transition: box-shadow var(--transition), transform var(--transition);
        }
        .industry-item:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }
        .industry-item .icon-bg {
            width: 64px;
            height: 64px;
            background: var(--primary-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            color: var(--primary);
            margin: 0 auto 16px;
        }
        .industry-item h4 {
            font-size: 18px;
            font-weight: 600;
            color: var(--secondary);
            margin-bottom: 8px;
        }
        .industry-item p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ===== 流程时间线 ===== */
        .timeline {
            position: relative;
            padding: 20px 0;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 50%;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--primary-light);
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .timeline-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 40px;
            position: relative;
        }
        .timeline-item:nth-child(odd) {
            flex-direction: row;
        }
        .timeline-item:nth-child(even) {
            flex-direction: row-reverse;
        }
        .timeline-item .timeline-content {
            width: 44%;
            background: var(--bg-white);
            border-radius: var(--radius-card);
            padding: 28px 26px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            transition: box-shadow var(--transition);
        }
        .timeline-item .timeline-content:hover {
            box-shadow: var(--shadow-card-hover);
        }
        .timeline-item .timeline-step {
            width: 12%;
            text-align: center;
            font-size: 28px;
            font-weight: 700;
            color: var(--primary);
            padding-top: 20px;
            position: relative;
            z-index: 2;
            display: flex;
            justify-content: center;
        }
        .timeline-item .timeline-step .step-circle {
            width: 52px;
            height: 52px;
            background: var(--primary);
            color: var(--text-white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 700;
            box-shadow: 0 4px 12px rgba(91, 155, 213, 0.3);
        }
        .timeline-item .timeline-content h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--secondary);
            margin-bottom: 10px;
        }
        .timeline-item .timeline-content p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* ===== 数据统计 ===== */
        .stats-section {
            background: var(--secondary);
            padding: 64px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            text-align: center;
        }
        .stats-item .stat-number {
            font-size: 40px;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stats-item .stat-label {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.8);
            font-weight: 400;
        }

        /* ===== FAQ 手风琴 ===== */
        .faq-accordion {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-accordion .accordion-item {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            margin-bottom: 14px;
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-accordion .accordion-item:hover {
            box-shadow: var(--shadow-card);
        }
        .faq-accordion .accordion-title {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--secondary);
            background: var(--bg-white);
            cursor: pointer;
            border: none;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
            gap: 12px;
        }
        .faq-accordion .accordion-title:hover {
            background: var(--bg-alt);
        }
        .faq-accordion .accordion-title .faq-icon {
            font-size: 18px;
            color: var(--primary);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-accordion .accordion-title .faq-icon.rotated {
            transform: rotate(45deg);
        }
        .faq-accordion .accordion-content {
            padding: 0 24px 20px;
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.7;
            display: none;
        }
        .faq-accordion .accordion-content.open {
            display: block;
        }

        /* ===== CTA 区块 ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            padding: 72px 0;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 14px;
        }
        .cta-section p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.9);
            max-width: 600px;
            margin: 0 auto 28px;
            line-height: 1.6;
        }
        .cta-section .cta-btn {
            display: inline-block;
            padding: 16px 42px;
            font-size: 17px;
            font-weight: 600;
            color: var(--secondary);
            background: var(--text-white);
            border-radius: var(--radius-btn);
            transition: background var(--transition), transform var(--transition);
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
        }
        .cta-section .cta-btn:hover {
            background: var(--bg-light);
            transform: translateY(-2px);
            color: var(--secondary);
        }
        .cta-section .cta-btn:active {
            transform: scale(0.98);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--secondary);
            color: rgba(255, 255, 255, 0.85);
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1.2fr;
            gap: 40px;
        }
        .footer-grid h4 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-white);
            margin-bottom: 18px;
        }
        .footer-grid p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.7);
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            transition: color var(--transition);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .footer-links a:hover {
            color: var(--text-white);
        }
        .footer-links a i {
            font-size: 10px;
            color: var(--primary);
        }
        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 12px;
        }
        .footer-contact li i {
            width: 20px;
            color: var(--primary);
            font-size: 15px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 20px 0;
            margin-top: 40px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
            text-align: center;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.6);
        }
        .footer-bottom a:hover {
            color: var(--text-white);
        }

        /* ===== 面包屑 ===== */
        .breadcrumb-bar {
            background: var(--bg-alt);
            padding: 14px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .breadcrumb-bar .breadcrumb {
            font-size: 14px;
            color: var(--text-muted);
        }
        .breadcrumb-bar .breadcrumb a {
            color: var(--primary);
        }
        .breadcrumb-bar .breadcrumb a:hover {
            color: var(--primary-dark);
        }
        .breadcrumb-bar .breadcrumb span {
            color: var(--text-body);
        }

        /* ===== 响应式断点 ===== */
        @media (max-width: 1024px) {
            .advantages-grid {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .industry-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
            .hero-content h1 {
                font-size: 34px;
            }
            .hero-content p {
                font-size: 18px;
            }
            .section-padding {
                padding: 60px 0;
            }
            .timeline-item .timeline-content {
                width: 40%;
            }
            .timeline-item .timeline-step {
                width: 20%;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
        }

        @media (max-width: 768px) {
            .main-nav {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .hero-section {
                min-height: 360px;
                padding: 60px 20px;
            }
            .hero-content h1 {
                font-size: 28px;
            }
            .hero-content p {
                font-size: 16px;
                margin-bottom: 24px;
            }
            .hero-content .hero-cta {
                padding: 14px 28px;
                font-size: 15px;
            }
            .advantages-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .industry-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .section-title h2 {
                font-size: 24px;
            }
            .section-title p {
                font-size: 15px;
            }
            .section-padding {
                padding: 48px 0;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .stats-item .stat-number {
                font-size: 32px;
            }

            /* 时间线移动端改为垂直流 */
            .timeline::before {
                left: 24px;
            }
            .timeline-item {
                flex-direction: row !important;
                padding-left: 60px;
                position: relative;
            }
            .timeline-item .timeline-content {
                width: 100%;
            }
            .timeline-item .timeline-step {
                width: auto;
                position: absolute;
                left: 0;
                top: 20px;
                padding-top: 0;
            }
            .timeline-item .timeline-step .step-circle {
                width: 42px;
                height: 42px;
                font-size: 15px;
            }
            .timeline-item:nth-child(even) {
                flex-direction: row !important;
            }
            .timeline-item .timeline-content {
                width: 100% !important;
            }

            .cta-section h2 {
                font-size: 24px;
            }
            .cta-section p {
                font-size: 15px;
            }
            .cta-section .cta-btn {
                padding: 14px 28px;
                font-size: 15px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .section-padding-sm {
                padding: 40px 0;
            }
        }

        @media (max-width: 520px) {
            .hero-content h1 {
                font-size: 24px;
            }
            .hero-content p {
                font-size: 15px;
            }
            .industry-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stats-item .stat-number {
                font-size: 28px;
            }
            .advantage-card {
                padding: 24px 20px;
            }
            .faq-accordion .accordion-title {
                padding: 14px 18px;
                font-size: 15px;
            }
            .faq-accordion .accordion-content {
                padding: 0 18px 16px;
                font-size: 14px;
            }
            .container {
                padding: 0 16px;
            }
            .section-padding {
                padding: 40px 0;
            }
            .timeline-item {
                padding-left: 50px;
            }
            .timeline-item .timeline-step .step-circle {
                width: 36px;
                height: 36px;
                font-size: 13px;
            }
            .timeline::before {
                left: 18px;
            }
            .footer-grid {
                gap: 20px;
            }
        }

        /* ===== 辅助类 ===== */
        .text-center {
            text-align: center;
        }
        .mb-20 {
            margin-bottom: 20px;
        }
        .mb-40 {
            margin-bottom: 40px;
        }
        .mt-20 {
            margin-top: 20px;
        }
        .mt-40 {
            margin-top: 40px;
        }
        .bg-alt {
            background: var(--bg-alt);
        }
        .bg-light {
            background: var(--bg-light);
        }
        .bg-white {
            background: var(--bg-white);
        }
        .rounded-card {
            border-radius: var(--radius-card);
        }
        .shadow-card {
            box-shadow: var(--shadow-card);
        }

/* roulang page: category3 */
:root {
            --primary: #5B9BD5;
            --primary-dark: #4A8BC5;
            --secondary: #2C3E50;
            --accent: #F39C12;
            --accent-dark: #E67E22;
            --bg-light: #F5F7FA;
            --bg-white: #FFFFFF;
            --bg-section: #F9FAFB;
            --text-dark: #2C3E50;
            --text-body: #555555;
            --text-light: #999999;
            --text-white: #FFFFFF;
            --border-color: #E5E7EB;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-input: 6px;
            --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-card-hover: 0 8px 20px rgba(0, 0, 0, 0.12);
            --transition-base: all 0.25s ease;
            --max-width: 1200px;
            --nav-height: 64px;
            --font-sans: 'Segoe UI', system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-sans);
            margin: 0;
            padding: 0;
            background: var(--bg-white);
            color: var(--text-body);
            font-size: 16px;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition-base);
        }
        a:hover,
        a:focus {
            color: var(--primary-dark);
            outline: none;
        }
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        button,
        .button {
            cursor: pointer;
            transition: var(--transition-base);
        }
        ul,
        ol {
            padding-left: 1.25rem;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        @media screen and (min-width: 640px) {
            .container {
                padding: 0 30px;
            }
        }
        @media screen and (min-width: 1024px) {
            .container {
                padding: 0 40px;
            }
        }

        /* ---------- 导航 ---------- */
        .site-header {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
            height: var(--nav-height);
            display: flex;
            align-items: center;
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-logo {
            font-size: 22px;
            font-weight: 700;
            color: var(--secondary);
            letter-spacing: -0.3px;
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .site-logo span.logo-accent {
            color: var(--primary);
        }
        .site-logo .logo-sub {
            font-size: 13px;
            font-weight: 400;
            color: var(--text-light);
            margin-left: 2px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            padding: 8px 16px;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            transition: var(--transition-base);
            position: relative;
        }
        .main-nav a:hover,
        .main-nav a:focus {
            color: var(--primary);
            background: rgba(91, 155, 213, 0.08);
        }
        .main-nav a.active {
            color: var(--primary);
            background: rgba(91, 155, 213, 0.12);
            font-weight: 600;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--secondary);
            padding: 6px 10px;
            border-radius: 6px;
            cursor: pointer;
        }
        .nav-toggle:hover {
            background: var(--bg-light);
        }
        @media screen and (max-width: 1024px) {
            .main-nav {
                display: none;
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 20px 24px 30px;
                gap: 4px;
                box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
                border-bottom: 1px solid var(--border-color);
                z-index: 999;
                align-items: stretch;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 12px 16px;
                font-size: 16px;
                border-radius: 8px;
            }
            .nav-toggle {
                display: block;
            }
        }

        /* ---------- Hero ---------- */
        .page-hero {
            position: relative;
            min-height: 340px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: var(--secondary);
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(44, 62, 80, 0.82) 0%, rgba(44, 62, 80, 0.60) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            padding: 60px 20px;
            max-width: 800px;
        }
        .hero-content h1 {
            font-size: 36px;
            font-weight: 700;
            color: var(--text-white);
            margin: 0 0 12px;
            line-height: 1.2;
            letter-spacing: -0.5px;
        }
        .hero-content p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.92);
            margin: 0;
            line-height: 1.6;
            max-width: 640px;
            margin-left: auto;
            margin-right: auto;
        }
        @media screen and (max-width: 640px) {
            .page-hero {
                min-height: 260px;
            }
            .hero-content {
                padding: 40px 16px;
            }
            .hero-content h1 {
                font-size: 26px;
            }
            .hero-content p {
                font-size: 16px;
            }
        }

        /* ---------- 面包屑 ---------- */
        .breadcrumb-area {
            background: var(--bg-section);
            padding: 14px 0;
            border-bottom: 1px solid var(--border-color);
        }
        .breadcrumb-area .breadcrumb {
            font-size: 14px;
            color: var(--text-light);
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            align-items: center;
        }
        .breadcrumb-area .breadcrumb a {
            color: var(--primary);
        }
        .breadcrumb-area .breadcrumb a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }
        .breadcrumb-area .breadcrumb span.current {
            color: var(--text-body);
            font-weight: 500;
        }
        .breadcrumb-area .breadcrumb i {
            font-size: 12px;
            color: var(--text-light);
        }

        /* ---------- 通用板块 ---------- */
        .section-block {
            padding: 60px 0;
        }
        .section-block.bg-light {
            background: var(--bg-section);
        }
        .section-block.bg-white {
            background: var(--bg-white);
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--secondary);
            margin: 0 0 12px;
            line-height: 1.2;
        }
        .section-title p {
            font-size: 16px;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
        }
        @media screen and (max-width: 640px) {
            .section-block {
                padding: 40px 0;
            }
            .section-title {
                margin-bottom: 32px;
            }
            .section-title h2 {
                font-size: 24px;
            }
        }

        /* ---------- 案例卡片网格 ---------- */
        .cases-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 28px;
        }
        @media screen and (min-width: 640px) {
            .cases-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media screen and (min-width: 1024px) {
            .cases-grid {
                grid-template-columns: 1fr 1fr 1fr;
            }
        }
        .case-card {
            background: var(--bg-white);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: var(--transition-base);
            display: flex;
            flex-direction: column;
            border: 1px solid rgba(0, 0, 0, 0.04);
        }
        .case-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }
        .case-card .card-img {
            height: 200px;
            overflow: hidden;
            position: relative;
            background: var(--bg-light);
        }
        .case-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .case-card:hover .card-img img {
            transform: scale(1.04);
        }
        .case-card .card-body {
            padding: 22px 24px 26px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .case-card .card-tag {
            display: inline-block;
            background: rgba(91, 155, 213, 0.12);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 20px;
            margin-bottom: 10px;
            align-self: flex-start;
        }
        .case-card .card-body h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--secondary);
            margin: 0 0 10px;
            line-height: 1.4;
        }
        .case-card .card-body p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.6;
            margin: 0 0 14px;
            flex: 1;
        }
        .case-card .card-meta {
            font-size: 13px;
            color: var(--text-light);
            border-top: 1px solid var(--border-color);
            padding-top: 12px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .case-card .card-meta .stat {
            font-weight: 600;
            color: var(--accent);
        }

        /* ---------- 数据统计区 ---------- */
        .stats-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            text-align: center;
        }
        @media screen and (min-width: 640px) {
            .stats-row {
                grid-template-columns: 1fr 1fr 1fr 1fr;
            }
        }
        .stat-item {
            padding: 28px 16px;
            background: var(--bg-white);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            border: 1px solid rgba(0, 0, 0, 0.04);
            transition: var(--transition-base);
        }
        .stat-item:hover {
            box-shadow: var(--shadow-card-hover);
        }
        .stat-item .number {
            font-size: 38px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.1;
            margin-bottom: 6px;
        }
        .stat-item .number .suffix {
            font-size: 20px;
            font-weight: 600;
        }
        .stat-item .label {
            font-size: 15px;
            color: var(--text-body);
            font-weight: 500;
        }
        @media screen and (max-width: 640px) {
            .stat-item .number {
                font-size: 30px;
            }
            .stat-item {
                padding: 20px 12px;
            }
        }

        /* ---------- 深度案例 ---------- */
        .deep-case {
            display: flex;
            flex-direction: column;
            gap: 28px;
            background: var(--bg-white);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            border: 1px solid rgba(0, 0, 0, 0.04);
        }
        .deep-case+.deep-case {
            margin-top: 28px;
        }
        .deep-case .case-header {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            padding: 28px 28px 0;
        }
        .deep-case .case-header .thumb {
            width: 100%;
            max-width: 240px;
            height: 160px;
            border-radius: 10px;
            overflow: hidden;
            background: var(--bg-light);
            flex-shrink: 0;
        }
        .deep-case .case-header .thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .deep-case .case-header .info {
            flex: 1;
            min-width: 200px;
        }
        .deep-case .case-header .info h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--secondary);
            margin: 0 0 6px;
        }
        .deep-case .case-header .info .industry {
            font-size: 14px;
            color: var(--primary);
            font-weight: 500;
            display: inline-block;
            background: rgba(91, 155, 213, 0.10);
            padding: 2px 14px;
            border-radius: 20px;
            margin-bottom: 8px;
        }
        .deep-case .case-header .info p {
            font-size: 15px;
            color: var(--text-body);
            margin: 0;
            line-height: 1.6;
        }
        .deep-case .case-body {
            padding: 0 28px 28px;
        }
        .deep-case .case-body .result-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 16px;
            margin-top: 16px;
        }
        .deep-case .case-body .result-item {
            background: var(--bg-section);
            border-radius: 8px;
            padding: 16px;
            text-align: center;
            border: 1px solid var(--border-color);
        }
        .deep-case .case-body .result-item .val {
            font-size: 22px;
            font-weight: 700;
            color: var(--accent);
        }
        .deep-case .case-body .result-item .desc {
            font-size: 13px;
            color: var(--text-body);
            margin-top: 4px;
        }
        @media screen and (max-width: 768px) {
            .deep-case .case-header {
                padding: 20px 20px 0;
                flex-direction: column;
            }
            .deep-case .case-header .thumb {
                max-width: 100%;
                height: 180px;
            }
            .deep-case .case-body {
                padding: 0 20px 20px;
            }
            .deep-case .case-body .result-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media screen and (max-width: 480px) {
            .deep-case .case-body .result-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ---------- FAQ ---------- */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: 10px;
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition-base);
        }
        .faq-item:hover {
            border-color: #d0d5dd;
        }
        .faq-item .faq-question {
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 600;
            color: var(--secondary);
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            gap: 12px;
            transition: var(--transition-base);
            font-family: inherit;
            line-height: 1.4;
        }
        .faq-item .faq-question:hover {
            background: rgba(91, 155, 213, 0.04);
        }
        .faq-item .faq-question .icon {
            font-size: 18px;
            color: var(--primary);
            flex-shrink: 0;
            transition: transform 0.3s ease;
        }
        .faq-item.open .faq-question .icon {
            transform: rotate(45deg);
        }
        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 22px;
            background: rgba(245, 247, 250, 0.4);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 6px 22px 18px;
        }
        .faq-item .faq-answer p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.7;
            margin: 0;
        }

        /* ---------- CTA ---------- */
        .cta-section {
            background: var(--secondary);
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(44, 62, 80, 0.78);
            z-index: 1;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-box {
            text-align: center;
            padding: 60px 20px;
        }
        .cta-box h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-white);
            margin: 0 0 12px;
        }
        .cta-box p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.88);
            max-width: 540px;
            margin: 0 auto 28px;
            line-height: 1.6;
        }
        .cta-box .cta-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: var(--text-white);
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            font-size: 16px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition-base);
            text-decoration: none;
            font-family: inherit;
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            color: var(--text-white);
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(243, 156, 18, 0.35);
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--text-white);
            padding: 13px 30px;
            border-radius: var(--radius-btn);
            font-size: 16px;
            font-weight: 600;
            border: 2px solid rgba(255, 255, 255, 0.6);
            cursor: pointer;
            transition: var(--transition-base);
            text-decoration: none;
            font-family: inherit;
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: var(--text-white);
            color: var(--text-white);
        }
        @media screen and (max-width: 640px) {
            .cta-box {
                padding: 40px 16px;
            }
            .cta-box h2 {
                font-size: 24px;
            }
            .btn-primary,
            .btn-secondary {
                padding: 12px 24px;
                font-size: 15px;
            }
        }

        /* ---------- 页脚 ---------- */
        footer[role="contentinfo"] {
            background: var(--secondary);
            color: rgba(255, 255, 255, 0.85);
            padding: 48px 0 0;
            font-size: 15px;
            line-height: 1.7;
        }
        footer[role="contentinfo"] .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 36px;
        }
        @media screen and (min-width: 640px) {
            footer[role="contentinfo"] .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media screen and (min-width: 1024px) {
            footer[role="contentinfo"] .footer-grid {
                grid-template-columns: 2fr 1fr 1.2fr;
            }
        }
        footer[role="contentinfo"] h4 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-white);
            margin: 0 0 16px;
        }
        footer[role="contentinfo"] p {
            margin: 0 0 6px;
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.7);
        }
        footer[role="contentinfo"] .footer-links,
        footer[role="contentinfo"] .footer-contact {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        footer[role="contentinfo"] .footer-links li,
        footer[role="contentinfo"] .footer-contact li {
            margin-bottom: 8px;
        }
        footer[role="contentinfo"] .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: var(--transition-base);
        }
        footer[role="contentinfo"] .footer-links a:hover {
            color: var(--primary);
            padding-left: 2px;
        }
        footer[role="contentinfo"] .footer-links a i {
            font-size: 10px;
            color: var(--primary);
        }
        footer[role="contentinfo"] .footer-contact li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
        }
        footer[role="contentinfo"] .footer-contact li i {
            width: 18px;
            color: var(--primary);
            text-align: center;
        }
        footer[role="contentinfo"] .footer-bottom {
            margin-top: 32px;
            padding: 18px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.10);
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
        }
        footer[role="contentinfo"] .footer-bottom a {
            color: rgba(255, 255, 255, 0.55);
        }
        footer[role="contentinfo"] .footer-bottom a:hover {
            color: var(--primary);
        }

        /* ---------- 响应式细节 ---------- */
        @media screen and (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .section-block {
                padding: 32px 0;
            }
            .hero-content h1 {
                font-size: 22px;
            }
            .card-body h3 {
                font-size: 17px;
            }
            .stats-row {
                gap: 12px;
            }
            .stat-item .number {
                font-size: 26px;
            }
        }

        /* ---------- 工具类 ---------- */
        .text-center {
            text-align: center;
        }
        .mt-20 {
            margin-top: 20px;
        }
        .mb-20 {
            margin-bottom: 20px;
        }
        .gap-16 {
            gap: 16px;
        }
        .flex-wrap {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
        }