/* roulang page: index */
:root{
  --primary:#0F7B8A;
  --primary-dark:#0A5C68;
  --primary-light:#E6F2F4;
  --accent:#F27A3D;
  --accent-dark:#DE6A2E;
  --accent-light:#FEEADF;
  --bg:#F5F8FA;
  --card:#FFFFFF;
  --text:#1F2A3A;
  --text-secondary:#5A6B7D;
  --text-muted:#8A99AA;
  --border:#E2E8F0;
  --radius-sm:6px;
  --radius-md:12px;
  --radius-lg:20px;
  --shadow-sm:0 2px 8px rgba(15,123,138,0.06);
  --shadow-md:0 8px 24px rgba(15,123,138,0.10);
  --shadow-lg:0 16px 40px rgba(15,123,138,0.14);
  --font:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);font-size:16px;line-height:1.75;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}
ul,ol{list-style:none}
input,button,textarea,select{font:inherit;color:inherit}
button{cursor:pointer;border:none;background:none}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:88px 0}
.section-head{margin-bottom:32px}
.section-head .overline{display:inline-block;font-size:14px;font-weight:600;color:var(--primary);background:var(--primary-light);padding:4px 14px;border-radius:20px;margin-bottom:12px;letter-spacing:.02em}
.section-head h2{font-size:28px;font-weight:700;line-height:1.4;color:var(--text)}
.section-head p{color:var(--text-secondary);font-size:15px;margin-top:10px;max-width:640px;line-height:1.7}
.btn{display:inline-flex;align-items:center;justify-content:center;font-weight:600;border-radius:26px;transition:all .25s ease;min-height:44px;padding:0 28px;font-size:15px;line-height:1}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 14px rgba(15,123,138,0.25)}
.btn-primary:hover{background:var(--primary-dark);color:#fff;transform:translateY(-1px);box-shadow:0 6px 20px rgba(15,123,138,0.3)}
.btn-outline{background:transparent;color:var(--primary);border:1.5px solid var(--primary)}
.btn-outline:hover{background:var(--primary-light);color:var(--primary-dark)}
.btn-accent{background:var(--accent);color:#fff;box-shadow:0 4px 14px rgba(242,122,61,0.25)}
.btn-accent:hover{background:var(--accent-dark);color:#fff;transform:translateY(-1px)}
.btn-lg{height:52px;padding:0 40px;font-size:16px}
/* Header */
.header{position:sticky;top:0;z-index:100;background:#fff;transition:box-shadow .3s,border-color .3s;border-bottom:1px solid transparent}
.header.scrolled{box-shadow:0 4px 20px rgba(15,123,138,0.07);border-bottom-color:var(--border)}
.nav-container{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-logo{display:inline-flex;align-items:center;justify-content:center;min-width:52px;height:36px;padding:0 10px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;font-size:14px;font-weight:800;letter-spacing:.05em;border-radius:8px;font-family:system-ui,sans-serif}
.brand-name{font-size:17px;font-weight:700;color:var(--text);white-space:nowrap}
.nav-links{display:flex;align-items:center;gap:32px}
.nav-links a{font-size:15px;font-weight:600;color:var(--text-secondary);padding:6px 4px;border-bottom:3px solid transparent;border-radius:2px;transition:color .2s,border-color .2s}
.nav-links a:hover{color:var(--primary);background:rgba(15,123,138,0.03)}
.nav-links a.active{color:var(--primary);border-bottom-color:var(--primary)}
.nav-cta{margin-left:20px}
.nav-toggle{display:none;flex-direction:column;gap:5px;width:44px;height:44px;align-items:center;justify-content:center;border-radius:8px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--text);border-radius:2px;transition:transform .3s,opacity .3s}
/* Mobile Nav Drawer */
.mobile-drawer{position:fixed;top:72px;left:0;right:0;bottom:0;background:#fff;z-index:99;padding:32px 24px;display:none;overflow-y:auto;flex-direction:column;gap:8px}
.mobile-drawer.open{display:flex}
.mobile-drawer a{font-size:18px;font-weight:600;color:var(--text);padding:14px 8px;border-bottom:1px solid var(--border);border-radius:8px}
.mobile-drawer a:hover{background:var(--primary-light);color:var(--primary)}
.mobile-drawer .btn{margin-top:24px;width:100%;height:48px}
body.no-scroll{overflow:hidden}
/* Hero */
.hero{position:relative;padding:72px 0 64px;background:linear-gradient(120deg,var(--primary-light) 0%,var(--bg) 60%)}
.hero::before{content:"";position:absolute;top:-80px;right:8%;width:300px;height:300px;border-radius:50%;background:rgba(15,123,138,0.06);pointer-events:none}
.hero::after{content:"";position:absolute;bottom:-40px;left:30%;width:180px;height:180px;border-radius:50%;background:rgba(15,123,138,0.04);pointer-events:none}
.hero .container{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.hero-content{max-width:560px}
.hero-tag{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,0.8);border:1px solid rgba(15,123,138,0.15);padding:6px 16px;border-radius:24px;font-size:13px;font-weight:600;color:var(--primary);margin-bottom:24px;box-shadow:var(--shadow-sm)}
.hero-tag i{font-style:normal}
.hero h1{font-size:44px;line-height:1.3;font-weight:700;color:var(--text);margin-bottom:18px;letter-spacing:0}
.hero h1 .highlight{color:var(--primary)}
.hero-sub{font-size:17px;line-height:1.7;color:var(--text-secondary);margin-bottom:36px;max-width:480px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.hero-image{position:relative}
.hero-image img{width:100%;height:350px;object-fit:cover;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}
.hero-image-card{display:block;width:100%;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg)}
/* Trust Bar */
.trust-bar{background:var(--card);border-bottom:1px solid var(--border);padding:28px 0}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.trust-item{text-align:center;padding:12px 8px}
.trust-item .number{font-size:36px;font-weight:800;color:var(--primary);font-variant-numeric:tabular-nums;line-height:1.2;display:block}
.trust-item .label{font-size:14px;color:var(--text-muted);margin-top:6px;display:block}
/* Pricing */
.pricing{background:var(--bg)}
.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch}
.price-card{position:relative;background:var(--card);border-radius:var(--radius-md);padding:32px;box-shadow:var(--shadow-sm);border:2px solid transparent;transition:transform .3s,box-shadow .3s}
.price-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.price-card.featured{border-color:var(--primary);box-shadow:var(--shadow-lg)}
.price-card.featured:hover{box-shadow:var(--shadow-lg)}
.price-badge{position:absolute;top:0;left:0;background:var(--accent);color:#fff;font-size:12px;font-weight:700;padding:4px 16px;border-radius:0 0 12px 0;z-index:2;letter-spacing:.02em}
.price-icon{width:64px;height:64px;border-radius:50%;background:var(--primary-light);display:flex;align-items:center;justify-content:center;margin-bottom:20px;color:var(--primary);font-size:26px;font-weight:700}
.price-card.featured .price-icon{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff}
.price-card h3{font-size:22px;font-weight:700;margin-bottom:6px}
.price-card .desc{font-size:14px;color:var(--text-secondary);margin-bottom:20px;line-height:1.6}
.price-card .divider{height:1px;background:var(--border);margin-bottom:20px}
.price-list li{font-size:14px;color:var(--text-secondary);padding:6px 0;display:flex;align-items:flex-start;gap:10px;line-height:1.6}
.price-list li::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--primary);flex-shrink:0;margin-top:8px}
.price-link{display:inline-block;margin-top:20px;font-size:14px;font-weight:600;color:var(--primary)}
.price-link:hover{color:var(--primary-dark);text-decoration:underline}
/* Comparison */
.compare{background:var(--card)}
.table-wrap{overflow-x:auto;border-radius:var(--radius-md);box-shadow:var(--shadow-md);background:var(--card)}
.compare-table{width:100%;min-width:640px;border-collapse:collapse;font-size:14px}
.compare-table th,.compare-table td{padding:14px 20px;text-align:center;border-bottom:1px solid var(--border);height:52px;vertical-align:middle}
.compare-table thead th{background:var(--primary-light);font-weight:600;font-size:15px;color:var(--text)}
.compare-table thead th:first-child{text-align:left}
.compare-table thead th.recommended{background:var(--primary);color:#fff;position:relative}
.compare-table td:first-child{text-align:left;font-weight:500;color:var(--text)}
.compare-table tbody tr:hover{background:#F8FBFC}
.compare-table tbody td.recommended{background:rgba(230,242,244,0.55);font-weight:600;color:var(--text)}
.compare-table .check{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:50%;background:var(--primary);color:#fff;font-size:12px;font-weight:700}
.compare-table .dash{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:50%;background:#EFF2F6;color:var(--text-muted);font-size:14px;line-height:1}
.badge-recommend{display:inline-block;background:var(--primary);color:#fff;font-size:12px;font-weight:600;padding:2px 12px;border-radius:12px;margin-bottom:6px}
/* Banner */
.banner{background:var(--bg)}
.banner-inner{position:relative;background:linear-gradient(120deg,var(--primary),var(--primary-dark));border-radius:var(--radius-lg);padding:48px;display:flex;justify-content:space-between;align-items:center;gap:40px;overflow:hidden;box-shadow:var(--shadow-lg)}
.banner-inner::after{content:"";position:absolute;right:-60px;top:-80px;width:220px;height:220px;border-radius:50%;background:rgba(255,255,255,0.08);pointer-events:none}
.banner-left{flex:1;position:relative;z-index:2}
.banner-left h3{color:#fff;font-size:26px;font-weight:700;margin-bottom:8px}
.banner-left p{color:rgba(255,255,255,0.85);font-size:15px;line-height:1.6}
.countdown{display:flex;align-items:center;gap:8px;margin-top:20px}
.countdown-box{background:rgba(255,255,255,0.14);border-radius:12px;padding:12px 16px;text-align:center;min-width:64px;backdrop-filter:blur(2px)}
.countdown-box .num{font-size:32px;font-weight:700;color:#fff;font-variant-numeric:tabular-nums;line-height:1.1;display:block}
.countdown-box .unit{font-size:13px;color:rgba(255,255,255,0.8);display:block;margin-top:2px}
.banner-right{position:relative;z-index:2;flex-shrink:0}
/* News */
.news{background:var(--bg)}
.news-header{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:32px}
.news-header h2{font-size:28px;font-weight:700}
.news-header .more{font-size:14px;font-weight:600;color:var(--text-secondary);padding:8px 12px;border-radius:20px;transition:all .2s}
.news-header .more:hover{background:var(--primary-light);color:var(--primary)}
.news-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.news-card{background:var(--card);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .3s,box-shadow .3s;display:flex;flex-direction:column}
.news-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.news-cover{position:relative;display:block;overflow:hidden;aspect-ratio:16/9;background:var(--primary-light)}
.news-cover img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.news-card:hover .news-cover img{transform:scale(1.03)}
.news-tag{position:absolute;left:12px;bottom:12px;background:var(--primary-light);color:var(--primary);font-size:12px;font-weight:600;padding:3px 10px;border-radius:var(--radius-sm);z-index:2}
.news-body{padding:20px 20px 16px;display:flex;flex-direction:column;flex:1}
.news-title{font-size:17px;font-weight:600;line-height:1.5;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:50px}
.news-title a{color:var(--text)}
.news-title a:hover{color:var(--primary)}
.news-excerpt{font-size:14px;color:var(--text-secondary);line-height:1.6;margin-bottom:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:44px}
.news-meta{display:flex;align-items:center;justify-content:space-between;padding-top:12px;border-top:1px solid var(--border);margin-top:auto}
.news-date{font-size:13px;color:var(--text-muted)}
.read-more{font-size:14px;font-weight:600;color:var(--primary)}
.read-more:hover{color:var(--primary-dark);text-decoration:underline}
.news-empty{border:2px dashed var(--border);border-radius:var(--radius-md);padding:48px;text-align:center;color:var(--text-muted);font-size:15px;background:var(--card);width:100%}
/* FAQ */
.faq{background:var(--card)}
.faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 48px}
.faq-item{border-bottom:1px solid var(--border)}
.faq-question{display:flex;align-items:center;justify-content:space-between;gap:20px;width:100%;text-align:left;padding:20px 0;font-size:16px;font-weight:600;color:var(--text);transition:color .2s;cursor:pointer}
.faq-question:hover{color:var(--primary);background:#F8FBFC;border-radius:8px;padding-left:12px;padding-right:12px}
.faq-icon{width:24px;height:24px;border-radius:50%;background:var(--primary-light);display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:400;color:var(--primary);transition:transform .25s;flex-shrink:0;line-height:1}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-answer{height:0;overflow:hidden;transition:height .25s ease}
.faq-answer-inner{padding:0 0 20px;font-size:15px;color:var(--text-secondary);line-height:1.7}
/* Contact */
.contact{background:linear-gradient(135deg,var(--primary-light) 0%,var(--bg) 100%)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.contact-left h2{font-size:28px;font-weight:700;margin-bottom:16px}
.contact-left > p{color:var(--text-secondary);font-size:15px;line-height:1.7;margin-bottom:28px}
.contact-list li{display:flex;align-items:center;gap:14px;padding:10px 0;font-size:15px;color:var(--text)}
.contact-list .icon{width:44px;height:44px;border-radius:50%;background:var(--card);display:flex;align-items:center;justify-content:center;color:var(--primary);font-size:16px;box-shadow:var(--shadow-sm);flex-shrink:0}
.contact-form-card{background:var(--card);border-radius:var(--radius-md);box-shadow:var(--shadow-md);padding:32px}
.contact-form-card .form-group{margin-bottom:20px}
.contact-form-card label{display:block;font-size:14px;font-weight:600;margin-bottom:6px}
.contact-form-card label .required{color:#E74C3C;margin-left:2px}
.form-input,.form-select,.form-textarea{width:100%;height:46px;border:1px solid #D0D9E4;border-radius:8px;padding:0 14px;font-size:15px;background:#fff;transition:border-color .2s,box-shadow .2s;outline:none}
.form-textarea{height:120px;padding-top:12px;resize:vertical}
.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(15,123,138,0.15)}
.form-submit{width:100%;height:48px;border-radius:24px;background:var(--primary);color:#fff;font-size:16px;font-weight:600;border:none;transition:background .2s,transform .2s;cursor:pointer}
.form-submit:hover{background:var(--primary-dark);transform:translateY(-1px)}
.form-tip{font-size:12px;color:var(--text-muted);text-align:center;margin-top:12px}
/* Footer */
.footer{background:#1F2A3A;color:#A8B6C6;padding:64px 0 0;font-size:14px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:48px;padding-bottom:48px}
.footer-brand .brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-brand .brand-logo{background:linear-gradient(135deg,var(--primary),var(--primary-dark))}
.footer-brand .brand-name{color:#fff;font-size:17px}
.footer-brand p{color:#A8B6C6;font-size:13px;line-height:1.7;max-width:280px}
.footer h4{color:#fff;font-size:16px;font-weight:600;margin-bottom:18px}
.footer-links li{margin-bottom:10px}
.footer-links a{color:#A8B6C6;font-size:14px;transition:color .2s}
.footer-links a:hover{color:#fff}
.footer-contact li{display:flex;align-items:center;gap:10px;margin-bottom:12px;color:#A8B6C6;font-size:14px}
.footer-contact .icon{width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,0.06);display:flex;align-items:center;justify-content:center;color:#D0E6EA;font-size:14px;flex-shrink:0}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.08);padding:20px 0;text-align:center;font-size:13px;color:rgba(255,255,255,0.6)}
/* Focus visible */
a:focus-visible,.btn:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,button:focus-visible,.faq-question:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}
/* Responsive */
@media(max-width:1024px){
  .hero .container{grid-template-columns:1fr;gap:40px}
  .hero-image img{height:300px}
  .trust-grid{grid-template-columns:repeat(2,1fr)}
  .pricing-grid{grid-template-columns:repeat(3,1fr);gap:16px}
  .price-card{padding:24px}
  .news-grid{grid-template-columns:repeat(2,1fr);gap:20px}
  .footer-grid{grid-template-columns:repeat(2,1fr);gap:32px}
}
@media(max-width:767px){
  .section{padding:56px 0}
  .container{padding:0 16px}
  .nav-links{display:none}
  .nav-cta{display:none}
  .nav-toggle{display:flex}
  .hero{padding:48px 0 40px}
  .hero h1{font-size:28px}
  .hero-sub{font-size:15px;margin-bottom:28px}
  .hero-btns{flex-direction:column;gap:12px}
  .hero-btns .btn{width:100%}
  .hero-image img{height:220px}
  .trust-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .trust-item .number{font-size:28px}
  .pricing-grid{grid-template-columns:1fr;gap:16px}
  .price-card{padding:24px}
  .banner-inner{flex-direction:column;padding:32px 24px;align-items:flex-start}
  .banner-right{width:100%}
  .banner-right .btn{width:100%}
  .countdown{flex-wrap:wrap}
  .news-grid{grid-template-columns:1fr;gap:16px}
  .faq-grid{grid-template-columns:1fr;gap:0}
  .contact-grid{grid-template-columns:1fr;gap:32px}
  .contact-form-card{padding:24px}
  .footer-grid{grid-template-columns:1fr}
  .footer{padding-top:48px}
  .news-header{flex-direction:column;align-items:flex-start;gap:8px}
  .compare-table{min-width:640px}
  .table-wrap{overflow-x:auto}
}

/* roulang page: category1 */
:root {
  --primary: #0F7B8A;
  --primary-dark: #0A5C68;
  --primary-light: #E6F2F4;
  --accent: #F27A3D;
  --accent-hover: #DE6A2E;
  --accent-light: #FEEADF;
  --bg: #F5F8FA;
  --card-bg: #FFFFFF;
  --text: #1F2A3A;
  --text-secondary: #5A6B7D;
  --text-weak: #8A99AA;
  --border: #E2E8F0;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 8px rgba(15,123,138,0.06);
  --shadow-md: 0 8px 24px rgba(15,123,138,0.10);
  --shadow-lg: 0 16px 40px rgba(15,123,138,0.14);
  --container: 1200px;
  --spacing-section: 88px;
  --header-h: 72px;
}
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}
ul, ol {
  list-style: none;
}
button {
  font-family: inherit;
  cursor: pointer;
}
input, select, textarea {
  font-family: inherit;
}
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 2px;
}
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: 24px;
  padding: 0 28px;
  height: 44px;
  transition: all 0.25s ease;
  cursor: pointer;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(15,123,138,0.22);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary-light);
}
.btn-lg {
  height: 52px;
  padding: 0 36px;
  font-size: 16px;
  border-radius: 26px;
}

/* ============ Header ============ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
}
.header.scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 2px 12px rgba(31,42,58,0.06);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: #fff;
  background: var(--primary);
  width: 42px;
  height: 42px;
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
}
.brand-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 2px;
  position: relative;
  transition: color 0.2s ease;
}
.nav-links a:hover {
  color: var(--primary);
}
.nav-links a.active {
  color: var(--primary);
  font-weight: 600;
}
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary);
  border-radius: 3px 3px 0 0;
}
.nav-cta {
  flex-shrink: 0;
  height: 40px;
  padding: 0 24px;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  border-radius: 8px;
  padding: 10px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}
.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============ Page Hero ============ */
.page-hero {
  background: linear-gradient(120deg, #E6F2F4 0%, #F5F8FA 60%, #ffffff 100%);
  padding: 72px 0 64px;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -60px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 42px solid rgba(15,123,138,0.06);
  pointer-events: none;
}
.page-hero .container {
  position: relative;
  z-index: 2;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-weak);
  margin-bottom: 24px;
}
.breadcrumb a {
  color: var(--text-weak);
}
.breadcrumb a:hover {
  color: var(--primary);
}
.breadcrumb .separator {
  color: var(--border);
}
.breadcrumb .current {
  color: var(--text-secondary);
}
.page-hero h1 {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
  margin-bottom: 16px;
}
.page-hero .lead {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 600px;
}

/* ============ Feature Sections ============ */
.feature-section {
  padding: var(--spacing-section) 0;
  background: #fff;
}
.feature-section.alt {
  background: var(--bg);
}
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.feature-row.reverse .feature-media {
  order: 2;
}
.feature-row.reverse .feature-content {
  order: 1;
}
.feature-media {
  position: relative;
}
.feature-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  background: var(--primary-light);
}
.feature-media::after {
  content: '';
  position: absolute;
  bottom: -16px;
  right: -16px;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 12px solid rgba(15,123,138,0.08);
  pointer-events: none;
  z-index: 0;
}
.feature-content {
  position: relative;
  z-index: 2;
}
.feature-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  padding: 4px 12px;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}
.feature-content h2 {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text);
  margin-bottom: 18px;
}
.feature-content p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.feature-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 24px;
  margin-top: 24px;
}
.feature-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text);
  font-weight: 500;
}
.feature-list li::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
}

/* ============ Topics Section ============ */
.topics-section {
  padding: var(--spacing-section) 0;
  background: var(--bg);
}
.section-header {
  margin-bottom: 40px;
}
.section-header h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.section-header p {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.6;
}
.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.topic-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
  border: 1px solid rgba(226,232,240,0.6);
}
.topic-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.topic-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--primary);
  margin-bottom: 20px;
  transition: background 0.25s ease, color 0.25s ease;
}
.topic-card:hover .topic-icon {
  background: var(--primary);
  color: #fff;
}
.topic-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
}
.topic-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}
.topic-card > a {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s ease;
}
.topic-card > a:hover {
  gap: 10px;
}
.topic-card > a i {
  font-size: 12px;
}

/* ============ CTA Section ============ */
.cta-section {
  padding: var(--spacing-section) 0;
  background: #fff;
}
.cta-bar {
  background: linear-gradient(115deg, #E6F2F4 0%, #ffffff 70%);
  border-radius: var(--radius-lg);
  padding: 48px 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(226,232,240,0.7);
  position: relative;
  overflow: hidden;
}
.cta-bar::after {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  border: 24px solid rgba(15,123,138,0.06);
  pointer-events: none;
}
.cta-text h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.cta-text p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.cta-bar .btn {
  position: relative;
  z-index: 2;
  flex-shrink: 0;
}

/* ============ Footer ============ */
.footer {
  background: #1F2A3A;
  padding-top: 64px;
  padding-bottom: 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer .brand {
  margin-bottom: 16px;
}
.footer .brand-logo {
  background: #fff;
  color: var(--primary);
}
.footer .brand-name {
  color: #fff;
  font-size: 17px;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.75;
  color: #A8B6C6;
  max-width: 300px;
}
.footer h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 18px;
}
.footer-links li,
.footer-contact li {
  margin-bottom: 12px;
}
.footer-links a {
  font-size: 14px;
  color: #A8B6C6;
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.footer-links a:hover {
  color: #fff;
  padding-left: 4px;
}
.footer-contact li {
  font-size: 14px;
  color: #A8B6C6;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  line-height: 1.6;
}
.footer-contact .icon {
  font-size: 15px;
  line-height: 1.4;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  text-align: center;
}
.footer-bottom p {
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.02em;
}

/* ============ Responsive ============ */
@media (max-width: 1023px) {
  .topics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-row {
    gap: 40px;
  }
  .feature-list {
    gap: 10px 20px;
  }
}
@media (max-width: 767px) {
  :root {
    --spacing-section: 56px;
  }
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 16px 24px 28px;
    box-shadow: 0 16px 28px rgba(31,42,58,0.10);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    border-bottom: 1px solid var(--border);
    z-index: 99;
  }
  .nav-links.open {
    transform: translateY(0);
  }
  .nav-links li {
    width: 100%;
  }
  .nav-links a {
    display: block;
    font-size: 18px;
    font-weight: 600;
    padding: 14px 0;
    color: var(--text);
    border-bottom: 1px solid rgba(226,232,240,0.5);
  }
  .nav-links a.active {
    color: var(--primary);
  }
  .nav-links a.active::after {
    display: none;
  }
  .nav-cta {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .page-hero {
    padding: 48px 0 40px;
  }
  .page-hero h1 {
    font-size: 28px;
  }
  .page-hero .lead {
    font-size: 15px;
  }
  .feature-row {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .feature-row.reverse .feature-media {
    order: 0;
  }
  .feature-row.reverse .feature-content {
    order: 1;
  }
  .feature-content h2 {
    font-size: 22px;
  }
  .feature-list {
    grid-template-columns: 1fr 1fr;
    gap: 10px 16px;
  }
  .topics-grid {
    grid-template-columns: 1fr;
  }
  .cta-bar {
    flex-direction: column;
    padding: 32px 24px;
    text-align: center;
  }
  .cta-bar .btn {
    width: 100%;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-brand p {
    max-width: none;
  }
}
@media (max-width: 520px) {
  .brand-name {
    font-size: 15px;
    white-space: normal;
    line-height: 1.3;
  }
  .feature-list {
    grid-template-columns: 1fr;
  }
  .feature-list li {
    font-size: 14px;
  }
  .topic-card {
    padding: 24px 20px;
  }
  .page-hero .breadcrumb {
    font-size: 13px;
  }
}

/* roulang page: category2 */
:root {
  --primary: #0F7B8A;
  --primary-dark: #0A5C68;
  --primary-light: #E6F2F4;
  --accent: #F27A3D;
  --accent-hover: #DE6A2E;
  --accent-light: #FEEADF;
  --bg: #F5F8FA;
  --card-bg: #FFFFFF;
  --text: #1F2A3A;
  --text-secondary: #5A6B7D;
  --text-muted: #8A99AA;
  --border: #E2E8F0;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 8px rgba(15,123,138,0.06);
  --shadow-md: 0 8px 24px rgba(15,123,138,0.10);
  --shadow-lg: 0 16px 40px rgba(15,123,138,0.14);
  --header-h: 72px;
  --container-w: 1200px;
  --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover {
  color: var(--primary-dark);
}
img {
  max-width: 100%;
  display: block;
  object-fit: cover;
}
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}
input, select, textarea {
  font-family: inherit;
  font-size: 14px;
}
ul {
  list-style: none;
}
.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 600;
  border-radius: 22px;
  height: 44px;
  padding: 0 32px;
  transition: all 0.25s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
}
.btn-accent {
  background: var(--accent);
  color: #fff;
  height: 48px;
  border-radius: 24px;
  padding: 0 36px;
  font-size: 16px;
}
.btn-accent:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(242,122,61,0.3);
}
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ===== Header / Nav ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: #fff;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.header.scrolled {
  border-color: var(--border);
  box-shadow: 0 2px 12px rgba(31,42,58,0.06);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.brand-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.05em;
  border-radius: 10px;
  flex-shrink: 0;
}
.brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  display: inline-flex;
  align-items: center;
  position: relative;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 8px 2px;
  transition: color 0.2s ease;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  border-radius: 2px;
  background: var(--primary);
  opacity: 0;
  transform: scaleX(0.4);
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.nav-links a:hover {
  color: var(--primary);
  background: rgba(15,123,138,0.03);
}
.nav-links a.active {
  color: var(--primary);
}
.nav-links a.active::after {
  opacity: 1;
  transform: scaleX(1);
}
.nav-cta {
  height: 40px;
  font-size: 14px;
  padding: 0 28px;
  margin-left: 8px;
  flex-shrink: 0;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: 8px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Page Hero ===== */
.page-hero {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--bg) 150%);
  padding: 64px 0 40px;
  margin-bottom: 36px;
}
.page-hero .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.page-hero .breadcrumb a {
  color: var(--text-secondary);
}
.page-hero .breadcrumb a:hover {
  color: var(--primary);
}
.page-hero h1 {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0;
  margin-bottom: 16px;
}
.page-hero .hero-desc {
  max-width: 680px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

/* ===== Content Split Blocks ===== */
.content-block {
  padding: 48px 0;
  background: var(--card-bg);
}
.content-block.alt {
  background: var(--bg);
}
.split-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.split-row.reverse .split-media {
  order: 2;
}
.split-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.split-media img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  aspect-ratio: 4/3;
}
.split-text h3 {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 16px;
}
.split-text p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.split-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 24px;
  margin-top: 20px;
}
.split-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  color: var(--text);
  line-height: 1.7;
}
.split-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}

/* ===== Topic Cards ===== */
.topic-section {
  padding: 72px 0;
  background: var(--card-bg);
}
.section-head {
  margin-bottom: 36px;
}
.section-head h2 {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 8px;
}
.section-head p {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 720px;
}
.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.topic-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 26px 24px;
  transition: box-shadow 0.3s ease, transform 0.3s ease, border-color 0.3s ease;
}
.topic-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: rgba(15,123,138,0.25);
}
.topic-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--primary-light);
  color: var(--primary);
  margin-bottom: 18px;
}
.topic-icon svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 1.8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.topic-card h3 {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 8px;
}
.topic-card p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 16px;
  min-height: 46px;
}
.topic-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}
.topic-link:hover {
  color: var(--primary-dark);
}

/* ===== FAQ ===== */
.faq-section {
  padding: 72px 0;
  background: var(--bg);
}
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 36px;
  margin-top: 36px;
}
.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0;
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}
.faq-item.open {
  box-shadow: var(--shadow-sm);
  border-color: rgba(15,123,138,0.25);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  text-align: left;
  padding: 20px 22px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  min-height: 56px;
  transition: background 0.2s ease;
}
.faq-question:hover {
  background: #F8FBFC;
}
.faq-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 16px;
  font-weight: 600;
  flex-shrink: 0;
  transition: transform 0.25s ease, background 0.25s ease;
}
.faq-item.open .faq-icon {
  transform: rotate(225deg);
  background: var(--primary);
  color: #fff;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}
.faq-answer p {
  padding: 0 22px 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* ===== CTA Bar ===== */
.cta-section {
  padding: 72px 0;
  background: var(--card-bg);
}
.cta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  background: var(--primary-light);
  border-radius: var(--radius-lg);
  padding: 40px 48px;
}
.cta-text h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
}
.cta-text p {
  font-size: 15px;
  color: var(--text-secondary);
}

/* ===== Footer ===== */
.footer {
  background: #1F2A3A;
  padding: 64px 0 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand .brand {
  margin-bottom: 16px;
}
.footer-brand .brand-logo {
  background: linear-gradient(135deg, #2AA6B5 0%, var(--primary) 100%);
}
.footer-brand .brand-name {
  color: #fff;
  font-size: 18px;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.75;
  color: #A8B6C6;
  max-width: 340px;
}
.footer h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 18px;
  letter-spacing: 0;
}
.footer-links li {
  margin-bottom: 10px;
}
.footer-links a {
  font-size: 14px;
  color: #A8B6C6;
  transition: color 0.2s ease;
}
.footer-links a:hover {
  color: #fff;
}
.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: #A8B6C6;
  margin-bottom: 12px;
  line-height: 1.6;
}
.footer-contact .icon {
  color: var(--primary);
  font-size: 16px;
  line-height: 1.5;
  flex-shrink: 0;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  text-align: center;
}
.footer-bottom p {
  font-size: 12px;
  color: rgba(255,255,255,0.6);
}

/* ===== Mobile Nav Panel ===== */
@media (max-width: 1023px) {
  .nav-links {
    gap: 20px;
  }
  .nav-links a {
    font-size: 14px;
  }
  .brand-name {
    font-size: 16px;
  }
  .nav-cta {
    padding: 0 20px;
  }
}
@media (max-width: 767px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 12px 24px 20px;
    box-shadow: 0 16px 32px rgba(31,42,58,0.12);
    transform: translateY(-120%);
    transition: transform 0.35s ease;
    z-index: 99;
  }
  .nav-links.open {
    transform: translateY(0);
  }
  .nav-links li {
    width: 100%;
  }
  .nav-links a {
    display: flex;
    align-items: center;
    width: 100%;
    height: 48px;
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    border-bottom: 1px solid var(--border);
  }
  .nav-links a::after {
    display: none;
  }
  .nav-links a.active {
    color: var(--primary);
  }
  .nav-links a:hover {
    background: var(--primary-light);
  }
  .nav-toggle {
    display: flex;
  }
  .nav-cta {
    display: none;
  }
  .page-hero {
    padding: 40px 0 28px;
  }
  .page-hero h1 {
    font-size: 28px;
  }
  .content-block {
    padding: 40px 0;
  }
  .split-row {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .split-row.reverse .split-media {
    order: 2;
  }
  .split-media img {
    height: 220px;
  }
  .split-list {
    grid-template-columns: 1fr;
  }
  .topic-section {
    padding: 48px 0;
  }
  .topic-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .topic-card p {
    min-height: 0;
  }
  .faq-section {
    padding: 48px 0;
  }
  .faq-grid {
    grid-template-columns: 1fr;
    gap: 16px;
    margin-top: 24px;
  }
  .cta-section {
    padding: 48px 0;
  }
  .cta-bar {
    flex-direction: column;
    text-align: center;
    padding: 32px 24px;
    gap: 24px;
  }
  .footer {
    padding: 48px 0 32px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .section-head h2 {
    font-size: 24px;
  }
}

/* roulang page: article */
:root {
  --primary: #0F7B8A;
  --primary-dark: #0A5C68;
  --primary-light: #E6F2F4;
  --accent: #F27A3D;
  --accent-dark: #DE6A2E;
  --accent-light: #FEEADF;
  --bg: #F5F8FA;
  --card-bg: #FFFFFF;
  --text: #1F2A3A;
  --text-secondary: #5A6B7D;
  --text-muted: #8A99AA;
  --border: #E2E8F0;
  --footer-bg: #1F2A3A;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 8px rgba(15,123,138,0.06);
  --shadow-md: 0 8px 24px rgba(15,123,138,0.10);
  --shadow-lg: 0 16px 40px rgba(15,123,138,0.14);
  --container: 1200px;
  --header-h: 72px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; font-size: 16px; }
ul, ol { list-style: none; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  padding: 14px 28px;
  border-radius: 24px;
  border: 1.5px solid transparent;
  transition: all 0.25s ease;
  text-align: center;
  min-height: 44px;
  white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-outline { background: transparent; border-color: var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-dark); transform: translateY(-1px); box-shadow: 0 8px 20px rgba(242,122,61,0.25); }
.btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: box-shadow 0.3s, border-color 0.3s;
}
.header.scrolled { border-bottom-color: var(--border); box-shadow: 0 4px 20px rgba(31,42,58,0.06); }
.nav-container { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }
.brand { display: flex; align-items: center; gap: 10px; min-height: 44px; }
.brand-logo {
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.05em;
  padding: 6px 10px;
  border-radius: 8px;
  line-height: 1.2;
}
.brand-name { font-size: 17px; font-weight: 700; color: var(--text); white-space: nowrap; }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 4px;
  transition: color 0.2s;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 3px;
  border-radius: 3px;
  background: var(--primary);
  transform: scaleX(0);
  transition: transform 0.25s ease;
}
.nav-links a:hover { color: var(--primary); }
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }
.nav-links a.active { color: var(--primary); font-weight: 600; }
.nav-cta { padding: 10px 24px; }
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  border-radius: 8px;
  padding: 10px;
}
.nav-toggle span { display: block; height: 2px; border-radius: 2px; background: var(--text); transition: transform 0.3s, opacity 0.3s; }
.nav-toggle:hover { background: var(--primary-light); }

/* Page content */
.page-content { padding: 48px 0 88px; }
.article-container { max-width: 860px; margin: 0 auto; }
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}
.breadcrumb a { color: var(--text-secondary); transition: color 0.2s; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { margin: 0 10px; color: #B0BEC5; }
.breadcrumb .current {
  color: var(--text);
  font-weight: 500;
  max-width: 420px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Article main */
.article-main {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 48px 56px;
  margin-bottom: 32px;
}
.article-header { margin-bottom: 40px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.article-header h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: 0;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  font-size: 14px;
  color: var(--text-muted);
}
.meta-item { display: inline-flex; align-items: center; gap: 6px; }
.meta-icon { font-size: 14px; }

/* Article content typography */
.article-content { max-width: 780px; margin: 0 auto; font-size: 16px; line-height: 1.8; color: var(--text); overflow-wrap: break-word; }
.article-content h2 {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.4;
  margin: 40px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.article-content h3 { font-size: 19px; font-weight: 600; line-height: 1.4; margin: 28px 0 12px; color: var(--text); }
.article-content h4 { font-size: 17px; font-weight: 600; line-height: 1.4; margin: 24px 0 10px; color: var(--text); }
.article-content p { margin-bottom: 24px; }
.article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 4px; transition: color 0.2s; }
.article-content a:hover { color: var(--primary-dark); }
.article-content img { max-width: 100%; border-radius: var(--radius-md); margin: 24px 0; box-shadow: var(--shadow-md); height: auto; }
.article-content blockquote {
  border-left: 4px solid var(--primary);
  background: var(--primary-light);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 16px 24px;
  margin: 24px 0;
  color: var(--text-secondary);
  font-style: italic;
}
.article-content ul, .article-content ol { padding-left: 24px; margin-bottom: 24px; }
.article-content ul li { position: relative; padding-left: 8px; margin-bottom: 8px; }
.article-content ul li::before {
  content: '';
  position: absolute;
  left: -16px;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}
.article-content ol li { padding-left: 4px; margin-bottom: 8px; }
.article-content table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 15px; }
.article-content th, .article-content td { border: 1px solid var(--border); padding: 12px 16px; text-align: left; }
.article-content th { background: var(--primary-light); font-weight: 600; }
.article-content hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }
.article-content code {
  background: var(--bg);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 0.9em;
  font-family: "SFMono-Regular", Consolas, monospace;
}
.article-content pre {
  background: #1F2A3A;
  color: #E6F2F4;
  border-radius: var(--radius-md);
  padding: 20px 24px;
  overflow-x: auto;
  margin: 24px 0;
  line-height: 1.6;
}
.article-content pre code { background: transparent; color: inherit; padding: 0; }

/* Article empty */
.article-empty { text-align: center; padding: 80px 20px; }
.empty-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 30px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.article-empty h1 { font-size: 26px; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.article-empty p { color: var(--text-secondary); margin-bottom: 24px; }

/* Pagination */
.article-pagination {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  margin-top: 40px;
}
.pagination-link {
  display: block;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: all 0.25s ease;
  min-height: 44px;
}
.pagination-link:hover { border-color: var(--primary); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.pagination-link.disabled { visibility: hidden; }
.direction { display: block; font-size: 13px; color: var(--text-muted); margin-bottom: 6px; }
.pagination-link.next .direction { text-align: right; }
.pagination-title {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.pagination-link.next .pagination-title { text-align: right; }

/* Related posts */
.related-posts { margin-top: 48px; }
.related-posts > h2 { font-size: 24px; font-weight: 700; margin-bottom: 24px; color: var(--text); }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.related-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.25s ease;
  display: block;
}
.related-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--primary); }
.related-img { height: 140px; overflow: hidden; }
.related-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.35s ease; }
.related-card:hover .related-img img { transform: scale(1.04); }
.related-info { padding: 16px 20px 20px; }
.related-info h3 {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 10px;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.related-date { font-size: 13px; color: var(--text-muted); }
.related-empty {
  background: #fff;
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 15px;
}
.related-empty a { color: var(--primary); font-weight: 600; }

/* Article CTA */
.article-cta {
  margin-top: 48px;
  background: var(--primary-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.cta-text h3 { font-size: 20px; font-weight: 700; margin-bottom: 6px; color: var(--text); }
.cta-text p { color: var(--text-secondary); font-size: 15px; }

/* Footer */
.footer { background: var(--footer-bg); color: #A8B6C6; padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .brand { margin-bottom: 16px; }
.footer-brand .brand-logo { background: rgba(255,255,255,0.12); color: #fff; }
.footer-brand .brand-name { color: #fff; }
.footer-brand p { font-size: 14px; line-height: 1.7; color: #A8B6C6; max-width: 320px; }
.footer h4 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 16px; }
.footer-links, .footer-contact { display: flex; flex-direction: column; gap: 12px; }
.footer-links a { font-size: 14px; color: #A8B6C6; transition: color 0.2s; }
.footer-links a:hover { color: #fff; }
.footer-contact li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; color: #A8B6C6; line-height: 1.6; }
.footer-contact .icon { flex-shrink: 0; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px; text-align: center; font-size: 13px; color: rgba(255,255,255,0.6); }

/* Responsive */
@media (max-width: 1023px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .article-main { padding: 40px 32px; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 767px) {
  .container { padding: 0 16px; }
  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 8px;
    box-shadow: var(--shadow-lg);
    transform: translateY(-20px);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
    border-bottom: 1px solid var(--border);
    z-index: 99;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-links a { width: 100%; padding: 14px 8px; font-size: 17px; font-weight: 600; border-bottom: 1px solid #f0f4f6; }
  .nav-links a::after { display: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .page-content { padding: 32px 0 56px; }
  .article-main { padding: 28px 20px; border-radius: var(--radius-md); }
  .article-header h1 { font-size: 24px; }
  .article-meta { flex-direction: column; gap: 8px; }
  .article-pagination { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .article-cta { flex-direction: column; text-align: center; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .breadcrumb .current { max-width: 180px; }
  .article-content table { display: block; overflow-x: auto; white-space: nowrap; }
}
@media (max-width: 520px) {
  .brand-name { font-size: 15px; }
  .brand-logo { font-size: 12px; padding: 5px 8px; }
  .article-main { padding: 24px 16px; }
  .article-header h1 { font-size: 22px; }
  .article-cta { padding: 28px 20px; }
}