/* roulang page: index */
:root {
  --bg-base: #0D0E12;
  --bg-card: #14161C;
  --bg-card-hover: #181B22;
  --bg-elevated: #1A1D24;
  --bg-input: #14161C;
  --primary: #C9971C;
  --primary-strong: #D4A12A;
  --primary-dim: rgba(201, 151, 28, 0.22);
  --primary-glow: rgba(201, 151, 28, 0.33);
  --color-eu: #5B6EE1;
  --color-eu-dim: rgba(91, 110, 225, 0.16);
  --color-cn: #C74B3A;
  --color-cn-dim: rgba(199, 75, 58, 0.16);
  --color-jk: #2FA38B;
  --color-jk-dim: rgba(47, 163, 139, 0.16);
  --text-main: #F2F0EB;
  --text-secondary: #B8B5AE;
  --text-weak: #6E6B64;
  --success: #2F9E6E;
  --warning: #C7A12A;
  --border-light: rgba(242, 240, 235, 0.08);
  --border-strong: rgba(242, 240, 235, 0.16);
  --mask-dark: rgba(13, 14, 18, 0.72);
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 2px 8px rgba(0,0,0,0.25);
  --shadow-hover: 0 6px 20px rgba(0,0,0,0.42);
  --shadow-elev: 0 10px 32px rgba(0,0,0,0.5);
  --space-section: 64px;
  --space-card-pad: 18px;
  --font-family: "PingFang SC","Microsoft YaHei","Noto Sans SC","Inter","Roboto",sans-serif;
  --transition: 0.22s ease;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-family);
  background: var(--bg-base);
  color: var(--text-main);
  line-height: 1.7;
  font-size: 16px;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; transition: color var(--transition), border-color var(--transition), background var(--transition), box-shadow var(--transition); }
img { max-width: 100%; display: block; height: auto; }
button, input, select, textarea { font-family: inherit; font-size: 100%; }
button { cursor: pointer; border: none; background: none; color: inherit; }
ul, ol { list-style: none; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.container { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
.section { padding: var(--space-section) 0; position: relative; }
.section-alt { background: var(--bg-card); border-top: 1px solid var(--border-light); border-bottom: 1px solid var(--border-light); }
.section-head { margin-bottom: 32px; }
.section-tag { display: inline-block; font-size: 13px; font-weight: 600; color: var(--primary); background: var(--primary-dim); border-radius: var(--radius-pill); padding: 4px 14px; margin-bottom: 10px; letter-spacing: 0.03em; }
.section-title { font-size: 28px; font-weight: 700; line-height: 1.3; color: var(--text-main); letter-spacing: -0.01em; }
.section-sub { font-size: 15px; color: var(--text-secondary); margin-top: 10px; max-width: 720px; line-height: 1.7; }
.section-title .hl { color: var(--primary); }
.section-title .hl-eu { color: var(--color-eu); }
.section-title .hl-cn { color: var(--color-cn); }
.section-title .hl-jk { color: var(--color-jk); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 14, 18, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-light);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.site-header.scrolled { border-bottom-color: var(--border-strong); box-shadow: 0 4px 20px rgba(0,0,0,0.4); }
.header-inner { display: flex; flex-direction: column; }
.header-brand-row { display: flex; align-items: center; justify-content: space-between; padding: 14px 0 10px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo { font-size: 20px; font-weight: 700; letter-spacing: -0.02em; line-height: 1.25; color: var(--text-main); }
.brand-logo .brand-main { color: var(--primary); }
.brand-logo .brand-sub { display: block; font-size: 13px; font-weight: 500; color: var(--text-secondary); letter-spacing: 0.04em; }
.header-action { display: flex; align-items: center; gap: 12px; }
.search-icon-btn { width: 38px; height: 38px; border-radius: 8px; border: 1px solid var(--border-strong); display: flex; align-items: center; justify-content: center; color: var(--text-secondary); transition: all var(--transition); }
.search-icon-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-dim); }
.nav-bar { display: flex; align-items: center; gap: 6px; padding: 8px 0 12px; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
.nav-bar::-webkit-scrollbar { display: none; }
.nav-link { display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px; border-radius: 8px; font-size: 14px; font-weight: 600; color: var(--text-secondary); border: 1px solid transparent; white-space: nowrap; transition: all var(--transition); }
.nav-link i { font-size: 16px; width: 18px; text-align: center; }
.nav-link:hover { color: var(--text-main); background: var(--border-light); }
.nav-link.active { color: var(--primary); background: var(--primary-dim); border-color: var(--primary-glow); }
.nav-link .nav-badge { font-size: 11px; background: var(--primary); color: #0D0E12; border-radius: var(--radius-pill); padding: 1px 8px; font-weight: 700; }

/* Hero */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: stretch;
  overflow: hidden;
  background: var(--bg-base);
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-overlay { position: absolute; inset: 0; background: var(--mask-dark); z-index: 1; }
.hero .container { position: relative; z-index: 2; display: flex; flex-direction: column; justify-content: center; padding-top: 52px; padding-bottom: 52px; }
.hero-main { display: grid; grid-template-columns: 1fr 0.78fr; gap: 36px; align-items: center; }
.hero-left { color: var(--text-main); }
.hero-title { font-size: 40px; font-weight: 700; line-height: 1.25; letter-spacing: -0.02em; margin-bottom: 14px; }
.hero-title .hl { color: var(--primary); }
.hero-sub { font-size: 16px; line-height: 1.8; color: var(--text-secondary); max-width: 600px; margin-bottom: 22px; }
.hero-search { display: flex; gap: 8px; max-width: 480px; margin-bottom: 16px; }
.hero-search input { flex: 1; padding: 11px 16px; border-radius: var(--radius-btn); border: 1px solid var(--border-strong); background: rgba(20, 22, 28, 0.82); color: var(--text-main); font-size: 14px; transition: border-color var(--transition), box-shadow var(--transition); }
.hero-search input::placeholder { color: var(--text-weak); }
.hero-search input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }
.hero-search button { padding: 11px 18px; border-radius: var(--radius-btn); background: var(--primary); color: #0D0E12; font-weight: 600; font-size: 14px; transition: filter var(--transition), transform var(--transition); white-space: nowrap; }
.hero-search button:hover { filter: brightness(1.1); transform: translateY(-1px); }
.hero-search button:active { transform: translateY(0); filter: brightness(0.94); }
.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.hero-tag { font-size: 13px; font-weight: 500; padding: 5px 13px; border-radius: var(--radius-pill); border: 1px solid var(--border-strong); color: var(--text-main); background: rgba(20, 22, 28, 0.7); transition: all var(--transition); }
.hero-tag:hover { border-color: var(--primary); color: var(--primary); }
.hero-tag.eu { border-color: var(--color-eu-dim); color: var(--color-eu); }
.hero-tag.cn { border-color: var(--color-cn-dim); color: var(--color-cn); }
.hero-tag.jk { border-color: var(--color-jk-dim); color: var(--color-jk); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 24px; border-radius: var(--radius-btn); font-size: 15px; font-weight: 600; transition: all var(--transition); }
.btn-primary { background: var(--primary); color: #0D0E12; }
.btn-primary:hover { filter: brightness(1.12); box-shadow: 0 4px 16px var(--primary-glow); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); filter: brightness(0.93); }
.btn-outline { border: 1px solid var(--border-strong); color: var(--text-main); background: transparent; }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.hero-right { display: flex; flex-direction: column; gap: 14px; }
.hero-param-card { background: rgba(20, 22, 28, 0.78); border: 1px solid var(--border-strong); border-radius: var(--radius-card); padding: 18px 20px; backdrop-filter: blur(6px); }
.hero-param-label { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-weak); margin-bottom: 6px; }
.hero-param-value { font-size: 26px; font-weight: 700; color: var(--primary); line-height: 1.2; }
.hero-param-value small { font-size: 13px; font-weight: 500; color: var(--text-secondary); }
.hero-param-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.hero-mini-stat { background: rgba(20, 22, 28, 0.7); border: 1px solid var(--border-light); border-radius: var(--radius-card); padding: 13px 16px; text-align: center; }
.hero-mini-stat .num { font-size: 22px; font-weight: 700; }
.hero-mini-stat .lab { font-size: 12px; color: var(--text-secondary); }
.hero-mini-stat .num.eu { color: var(--color-eu); }
.hero-mini-stat .num.cn { color: var(--color-cn); }
.hero-mini-stat .num.jk { color: var(--color-jk); }

/* KPI */
.kpi-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.kpi-card { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); padding: 22px 20px; text-align: left; transition: all var(--transition); }
.kpi-card:hover { border-color: var(--primary-glow); box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.kpi-num { font-size: 34px; font-weight: 700; color: var(--primary); line-height: 1.15; letter-spacing: -0.01em; }
.kpi-num .unit { font-size: 15px; font-weight: 500; color: var(--text-secondary); margin-left: 3px; }
.kpi-label { font-size: 14px; color: var(--text-secondary); margin-top: 6px; font-weight: 500; }

/* Category Entry Grid */
.category-showcase { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.category-item { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 20px 14px; border-radius: var(--radius-card); border: 1px solid var(--border-light); background: var(--bg-card); transition: all var(--transition); }
.category-item:hover { border-color: var(--primary); box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.category-item-img { width: 100%; aspect-ratio: 16/10; border-radius: 8px; overflow: hidden; margin-bottom: 12px; background: var(--bg-elevated); }
.category-item-img img { width: 100%; height: 100%; object-fit: cover; }
.category-item-icon { font-size: 22px; margin-bottom: 6px; }
.category-item .cat-label { font-size: 15px; font-weight: 600; color: var(--text-main); }
.category-item .cat-desc { font-size: 12px; color: var(--text-weak); margin-top: 4px; }
.cat-icon-eu { color: var(--color-eu); }
.cat-icon-cn { color: var(--color-cn); }
.cat-icon-jk { color: var(--color-jk); }
.cat-icon-primary { color: var(--primary); }

/* Service Matrix */
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.service-card { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); padding: 20px 18px; transition: all var(--transition); display: flex; flex-direction: column; }
.service-card:hover { border-color: var(--primary-glow); box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.service-card .svc-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.service-card .svc-badge { font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: var(--radius-pill); }
.badge-new { background: var(--color-jk-dim); color: var(--color-jk); }
.badge-hot { background: var(--primary-dim); color: var(--primary); }
.badge-update { background: var(--color-eu-dim); color: var(--color-eu); }
.badge-high { background: var(--color-cn-dim); color: var(--color-cn); }
.service-card h3 { font-size: 17px; font-weight: 600; color: var(--text-main); margin-bottom: 6px; line-height: 1.4; }
.service-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.65; flex: 1; }

/* Comparison */
.compare-wrap { display: grid; grid-template-columns: 0.9fr 1fr 1fr 1fr; gap: 0; border: 1px solid var(--border-strong); border-radius: var(--radius-card); overflow: hidden; background: var(--bg-card); }
.compare-col { padding: 18px 16px; border-right: 1px solid var(--border-light); }
.compare-col:last-child { border-right: none; }
.compare-col.compare-label { background: var(--bg-elevated); font-weight: 600; font-size: 14px; color: var(--text-secondary); display: flex; align-items: center; }
.compare-col.eu-col { background: rgba(91, 110, 225, 0.07); }
.compare-col.cn-col { background: rgba(199, 75, 58, 0.07); }
.compare-col.jk-col { background: rgba(47, 163, 139, 0.07); }
.compare-col .col-head { font-size: 16px; font-weight: 700; margin-bottom: 10px; }
.compare-col.eu-col .col-head { color: var(--color-eu); }
.compare-col.cn-col .col-head { color: var(--color-cn); }
.compare-col.jk-col .col-head { color: var(--color-jk); }
.compare-row { padding: 8px 0; font-size: 13px; color: var(--text-secondary); border-bottom: 1px solid var(--border-light); }
.compare-row:last-child { border-bottom: none; }
.compare-row strong { color: var(--text-main); font-weight: 600; }

/* Milestone */
.timeline { position: relative; padding-left: 26px; }
.timeline::before { content: ''; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: var(--border-strong); border-radius: 2px; }
.milestone-item { position: relative; padding: 0 0 28px 22px; }
.milestone-item:last-child { padding-bottom: 0; }
.milestone-item::before { content: ''; position: absolute; left: -22px; top: 6px; width: 12px; height: 12px; border-radius: 50%; background: var(--primary); border: 3px solid var(--bg-base); box-shadow: 0 0 0 3px var(--primary-glow); }
.milestone-item .ms-time { font-size: 13px; font-weight: 600; color: var(--primary); margin-bottom: 4px; }
.milestone-item .ms-title { font-size: 17px; font-weight: 600; color: var(--text-main); margin-bottom: 4px; }
.milestone-item .ms-desc { font-size: 14px; color: var(--text-secondary); }

/* Topic Cards */
.topic-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.topic-card { display: flex; gap: 16px; background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); padding: 16px; transition: all var(--transition); }
.topic-card:hover { border-color: var(--primary-glow); box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.topic-card .tc-img { width: 130px; min-width: 130px; aspect-ratio: 16/10; border-radius: 8px; overflow: hidden; background: var(--bg-elevated); }
.topic-card .tc-img img { width: 100%; height: 100%; object-fit: cover; }
.topic-card .tc-body { flex: 1; display: flex; flex-direction: column; }
.topic-card .tc-title { font-size: 16px; font-weight: 600; color: var(--text-main); margin-bottom: 6px; line-height: 1.4; }
.topic-card .tc-desc { font-size: 14px; color: var(--text-secondary); flex: 1; line-height: 1.6; }
.topic-card .tc-link { display: inline-flex; align-items: center; gap: 5px; font-size: 13px; font-weight: 600; color: var(--primary); margin-top: 8px; }
.topic-card .tc-link:hover { color: var(--primary-strong); }
.topic-card .tc-tag { display: inline-block; align-self: flex-start; font-size: 12px; font-weight: 600; padding: 2px 10px; border-radius: var(--radius-pill); margin-bottom: 6px; }

/* News List */
.news-layout { display: grid; grid-template-columns: 1fr; gap: 14px; }
.news-card { display: flex; gap: 16px; background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); padding: 14px 16px; transition: all var(--transition); }
.news-card:hover { border-color: var(--primary-glow); box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.news-card .nc-img { width: 120px; min-width: 120px; aspect-ratio: 16/10; border-radius: 8px; overflow: hidden; background: var(--bg-elevated); }
.news-card .nc-img img { width: 100%; height: 100%; object-fit: cover; }
.news-card .nc-body { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.news-card .nc-title { font-size: 16px; font-weight: 600; color: var(--text-main); margin-bottom: 5px; line-height: 1.4; }
.news-card .nc-excerpt { font-size: 14px; color: var(--text-secondary); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card .nc-meta { display: flex; align-items: center; gap: 10px; margin-top: 8px; font-size: 13px; color: var(--text-weak); flex-wrap: wrap; }
.news-card .nc-cat { font-size: 12px; font-weight: 600; padding: 2px 10px; border-radius: var(--radius-pill); background: var(--primary-dim); color: var(--primary); }
.news-card .nc-link { margin-left: auto; font-size: 13px; font-weight: 600; color: var(--primary); white-space: nowrap; }
.news-card .nc-link:hover { color: var(--primary-strong); }
.empty-state { text-align: center; padding: 44px 20px; background: var(--bg-card); border: 1px dashed var(--border-strong); border-radius: var(--radius-card); }
.empty-state .empty-icon { font-size: 32px; margin-bottom: 10px; color: var(--text-weak); }
.empty-state p { color: var(--text-secondary); font-size: 15px; }
.empty-state .btn { margin-top: 14px; }
.news-more { margin-top: 18px; text-align: center; }

/* Platform Guarantee */
.guarantee-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.guarantee-item { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); padding: 20px 18px; text-align: center; transition: all var(--transition); }
.guarantee-item:hover { border-color: var(--primary-glow); box-shadow: var(--shadow-hover); }
.guarantee-item .gi-icon { font-size: 26px; margin-bottom: 10px; }
.guarantee-item .gi-title { font-size: 15px; font-weight: 600; color: var(--text-main); margin-bottom: 5px; }
.guarantee-item .gi-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.55; }
.gi-color-eu { color: var(--color-eu); }
.gi-color-cn { color: var(--color-cn); }
.gi-color-jk { color: var(--color-jk); }
.gi-color-primary { color: var(--primary); }

/* Quick Answers */
.quick-answer-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 28px; align-items: center; }
.qa-left .section-title { margin-bottom: 10px; }
.qa-left p { color: var(--text-secondary); font-size: 15px; line-height: 1.7; }
.qa-right { display: flex; flex-direction: column; gap: 10px; }
.qa-item { display: flex; align-items: center; gap: 12px; padding: 12px 16px; background: var(--bg-card); border: 1px solid var(--border-light); border-radius: 8px; font-size: 14px; font-weight: 500; color: var(--text-main); transition: all var(--transition); }
.qa-item:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-dim); transform: translateX(4px); }
.qa-item i { width: 20px; text-align: center; color: var(--primary); }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 12px; max-width: 880px; margin: 0 auto; }
.faq-item { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); overflow: hidden; transition: all var(--transition); }
.faq-item.open { background: var(--bg-card-hover); border-color: var(--primary-glow); box-shadow: var(--shadow-card); }
.faq-question { display: flex; align-items: flex-start; gap: 14px; padding: 16px 18px; cursor: pointer; font-size: 16px; font-weight: 600; color: var(--text-main); transition: color var(--transition); width: 100%; text-align: left; }
.faq-question:hover { color: var(--primary); }
.faq-q-num { font-size: 14px; font-weight: 700; color: var(--primary); min-width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; background: var(--primary-dim); border-radius: 6px; }
.faq-arrow { margin-left: auto; font-size: 16px; color: var(--text-weak); transition: transform var(--transition); flex-shrink: 0; }
.faq-item.open .faq-arrow { transform: rotate(180deg); color: var(--primary); }
.faq-answer { padding: 0 18px 18px 60px; font-size: 14px; color: var(--text-secondary); line-height: 1.7; display: none; }
.faq-item.open .faq-answer { display: block; }

/* Form */
.form-wrap { display: grid; grid-template-columns: 1fr 0.85fr; gap: 28px; align-items: stretch; }
.form-card { background: var(--bg-card); border: 1px solid var(--border-strong); border-radius: var(--radius-card); padding: 28px 26px; }
.form-card .form-title { font-size: 22px; font-weight: 700; color: var(--text-main); margin-bottom: 8px; }
.form-card .form-desc { font-size: 14px; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.65; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 13px; font-weight: 500; color: var(--text-secondary); margin-bottom: 5px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 10px 14px; border-radius: var(--radius-btn); border: 1px solid var(--border-strong); background: var(--bg-input); color: var(--text-main); font-size: 14px; transition: border-color var(--transition), box-shadow var(--transition); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }
.form-group textarea { min-height: 90px; resize: vertical; }
.form-submit { width: 100%; padding: 13px; border-radius: var(--radius-btn); background: var(--primary); color: #0D0E12; font-weight: 600; font-size: 15px; transition: all var(--transition); }
.form-submit:hover { filter: brightness(1.12); box-shadow: 0 4px 16px var(--primary-glow); }
.form-submit:active { filter: brightness(0.93); }
.form-aside { border-radius: var(--radius-card); overflow: hidden; min-height: 260px; position: relative; }
.form-aside img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
.form-aside .form-aside-overlay { position: absolute; inset: 0; background: rgba(13, 14, 18, 0.45); display: flex; align-items: flex-end; padding: 18px; }
.form-aside .form-aside-text { font-size: 14px; font-weight: 500; color: var(--text-main); background: rgba(20, 22, 28, 0.7); padding: 10px 16px; border-radius: 8px; }
.form-privacy { font-size: 12px; color: var(--text-weak); margin-top: 10px; text-align: center; }

/* Footer */
.site-footer { background: var(--bg-card); border-top: 1px solid var(--border-strong); padding: 48px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 0.8fr 0.8fr 1.1fr; gap: 28px; margin-bottom: 30px; }
.footer-brand .brand-logo { font-size: 18px; }
.footer-brand p { font-size: 13px; color: var(--text-weak); margin-top: 8px; line-height: 1.6; }
.footer-col h4 { font-size: 15px; font-weight: 600; color: var(--text-main); margin-bottom: 12px; }
.footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-col ul a { font-size: 13px; color: var(--text-secondary); transition: color var(--transition); }
.footer-col ul a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid var(--border-light); padding-top: 18px; text-align: center; font-size: 13px; color: var(--text-weak); }
.footer-bottom .domain { color: var(--text-secondary); }

/* Responsive */
@media (max-width: 1024px) {
  .hero-main { grid-template-columns: 1fr; gap: 28px; }
  .hero-right { flex-direction: row; flex-wrap: wrap; }
  .hero-param-grid { flex: 1; }
  .hero-param-card { flex: 1; min-width: 200px; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .category-showcase { grid-template-columns: repeat(2, 1fr); }
  .compare-wrap { grid-template-columns: 1fr; }
  .compare-col { border-right: none; border-bottom: 1px solid var(--border-light); }
  .compare-col:last-child { border-bottom: none; }
  .guarantee-grid { grid-template-columns: repeat(2, 1fr); }
  .quick-answer-grid { grid-template-columns: 1fr; }
  .form-wrap { grid-template-columns: 1fr; }
  .form-aside { min-height: 200px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  :root { --space-section: 44px; }
  .section-title { font-size: 23px; }
  .hero { min-height: auto; }
  .hero .container { padding-top: 36px; padding-bottom: 36px; }
  .hero-title { font-size: 28px; }
  .hero-sub { font-size: 15px; }
  .hero-right { flex-direction: column; }
  .hero-param-grid { grid-template-columns: 1fr 1fr; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .kpi-num { font-size: 26px; }
  .category-showcase { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .service-grid { grid-template-columns: 1fr; gap: 12px; }
  .topic-grid { grid-template-columns: 1fr; gap: 12px; }
  .news-card { flex-direction: column; padding: 12px; }
  .news-card .nc-img { width: 100%; min-width: auto; aspect-ratio: 16/9; }
  .guarantee-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .header-brand-row { padding: 10px 0 6px; }
  .brand-logo { font-size: 17px; }
  .nav-bar { gap: 4px; }
  .nav-link { padding: 7px 12px; font-size: 13px; }
  .faq-answer { padding-left: 18px; padding-right: 16px; }
  .form-card { padding: 20px 18px; }
}
@media (max-width: 520px) {
  :root { --space-section: 36px; }
  .container { padding: 0 16px; }
  .hero-title { font-size: 26px; }
  .hero-search { flex-direction: column; }
  .hero-search button { width: 100%; }
  .hero-param-grid { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: 1fr; }
  .category-showcase { grid-template-columns: 1fr; }
  .guarantee-grid { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: 1fr; }
  .topic-card { flex-direction: column; padding: 12px; }
  .topic-card .tc-img { width: 100%; min-width: auto; aspect-ratio: 16/9; }
  .section-title { font-size: 21px; }
  .btn { width: 100%; }
  .hero-cta .btn { width: 100%; }
  .compare-col { padding: 14px 12px; }
  .form-card { padding: 18px 14px; }
  .faq-question { font-size: 15px; padding: 13px 14px; }
  .milestone-item .ms-title { font-size: 15px; }
  .brand-logo { font-size: 15px; letter-spacing: -0.01em; }
}

/* roulang page: article */
:root {
        --bg-base: #0D0E12;
        --bg-card: #14161C;
        --bg-card-hover: #181B22;
        --bg-elevated: #1A1D24;
        --bg-input: #14161C;
        --primary: #C9971C;
        --primary-strong: #D4A12A;
        --primary-dim: rgba(201,151,28,0.22);
        --primary-glow: rgba(201,151,28,0.33);
        --color-eu: #5B6EE1;
        --color-eu-dim: rgba(91,110,225,0.16);
        --color-cn: #C74B3A;
        --color-cn-dim: rgba(199,75,58,0.16);
        --color-jk: #2FA38B;
        --color-jk-dim: rgba(47,163,139,0.16);
        --text-main: #F2F0EB;
        --text-secondary: #B8B5AE;
        --text-weak: #6E6B64;
        --success: #2F9E6E;
        --warning: #C7A12A;
        --border-light: rgba(242,240,235,0.08);
        --border-strong: rgba(242,240,235,0.16);
        --mask-dark: rgba(13,14,18,0.72);
        --radius-card: 12px;
        --radius-btn: 8px;
        --radius-pill: 999px;
        --shadow-card: 0 2px 8px rgba(0,0,0,0.25);
        --shadow-hover: 0 6px 20px rgba(0,0,0,0.42);
        --shadow-elev: 0 10px 32px rgba(0,0,0,0.5);
        --space-section: 64px;
        --space-card-pad: 18px;
        --font-family: "PingFang SC","Microsoft YaHei","Noto Sans SC","Inter","Roboto",sans-serif;
        --transition: 0.22s ease;
    }
    html {
        scroll-behavior: smooth;
        -webkit-text-size-adjust: 100%;
    }
    *,
    *::before,
    *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }
    body {
        font-family: var(--font-family);
        background: var(--bg-base);
        color: var(--text-main);
        line-height: 1.7;
        font-size: 16px;
        min-height: 100vh;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    a {
        color: inherit;
        text-decoration: none;
        transition: color var(--transition), border-color var(--transition), background var(--transition), box-shadow var(--transition);
    }
    img {
        max-width: 100%;
        display: block;
        height: auto;
    }
    button,
    input,
    select,
    textarea {
        font-family: inherit;
        font-size: 100%;
    }
    button {
        cursor: pointer;
        border: none;
        background: none;
        color: inherit;
    }
    ul,
    ol {
        list-style: none;
    }
    .container {
        max-width: 1240px;
        margin: 0 auto;
        padding: 0 24px;
    }
    .section {
        padding: var(--space-section) 0;
        position: relative;
    }
    .section-alt {
        background: var(--bg-card);
        border-top: 1px solid var(--border-light);
        border-bottom: 1px solid var(--border-light);
    }
    .section-head {
        margin-bottom: 32px;
    }
    .section-tag {
        display: inline-block;
        font-size: 13px;
        font-weight: 600;
        color: var(--primary);
        background: var(--primary-dim);
        border-radius: var(--radius-pill);
        padding: 4px 14px;
        margin-bottom: 10px;
        letter-spacing: 0.03em;
    }
    .section-title {
        font-size: 28px;
        font-weight: 700;
        line-height: 1.3;
        color: var(--text-main);
        letter-spacing: -0.01em;
    }
    .section-sub {
        font-size: 15px;
        color: var(--text-secondary);
        margin-top: 10px;
        max-width: 720px;
        line-height: 1.7;
    }
    .section-title .hl {
        color: var(--primary);
    }
    .section-title .hl-eu {
        color: var(--color-eu);
    }
    .section-title .hl-cn {
        color: var(--color-cn);
    }
    .section-title .hl-jk {
        color: var(--color-jk);
    }
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 10px 20px;
        border-radius: var(--radius-btn);
        font-size: 14px;
        font-weight: 600;
        line-height: 1.5;
        transition: all var(--transition);
        border: 1px solid transparent;
    }
    .btn:focus-visible {
        outline: 2px solid var(--primary);
        outline-offset: 2px;
    }
    .btn-primary {
        background: var(--primary);
        color: #0D0E12;
    }
    .btn-primary:hover {
        background: var(--primary-strong);
        box-shadow: 0 4px 14px rgba(201,151,28,0.35);
    }
    .btn-primary:active {
        background: #B8840F;
    }
    .btn-outline {
        background: transparent;
        border-color: var(--border-strong);
        color: var(--text-secondary);
    }
    .btn-outline:hover {
        border-color: var(--primary);
        color: var(--primary);
        background: var(--primary-dim);
    }
    .btn-sm {
        padding: 6px 14px;
        font-size: 13px;
    }
    .badge {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-size: 12px;
        font-weight: 600;
        border-radius: var(--radius-pill);
        padding: 3px 10px;
        line-height: 1.5;
        white-space: nowrap;
    }
    .badge-eu {
        color: var(--color-eu);
        background: var(--color-eu-dim);
    }
    .badge-cn {
        color: var(--color-cn);
        background: var(--color-cn-dim);
    }
    .badge-jk {
        color: var(--color-jk);
        background: var(--color-jk-dim);
    }
    .badge-primary {
        color: var(--primary);
        background: var(--primary-dim);
    }
    .badge-neutral {
        color: var(--text-secondary);
        background: rgba(242,240,235,0.08);
    }
    /* Header */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 100;
        background: rgba(13,14,18,0.86);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        border-bottom: 1px solid var(--border-light);
        transition: border-color var(--transition), box-shadow var(--transition);
    }
    .site-header.scrolled {
        border-bottom-color: var(--border-strong);
        box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    }
    .header-inner {
        display: flex;
        flex-direction: column;
    }
    .header-brand-row {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 14px 0 10px;
        gap: 16px;
    }
    .brand {
        display: flex;
        align-items: center;
        gap: 12px;
    }
    .brand-logo {
        font-size: 20px;
        font-weight: 700;
        letter-spacing: -0.02em;
        line-height: 1.25;
        color: var(--text-main);
    }
    .brand-logo .brand-main {
        color: var(--primary);
    }
    .brand-logo .brand-sub {
        display: block;
        font-size: 13px;
        font-weight: 500;
        color: var(--text-secondary);
        letter-spacing: 0.04em;
    }
    .header-action {
        display: flex;
        align-items: center;
        gap: 12px;
    }
    .search-icon-btn {
        width: 38px;
        height: 38px;
        border-radius: 8px;
        border: 1px solid var(--border-strong);
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--text-secondary);
        transition: all var(--transition);
    }
    .search-icon-btn:hover {
        border-color: var(--primary);
        color: var(--primary);
        background: var(--primary-dim);
    }
    .nav-bar {
        display: flex;
        align-items: center;
        gap: 6px;
        padding: 8px 0 12px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }
    .nav-bar::-webkit-scrollbar {
        display: none;
    }
    .nav-link {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 8px 16px;
        border-radius: 8px;
        font-size: 14px;
        font-weight: 600;
        color: var(--text-secondary);
        border: 1px solid transparent;
        white-space: nowrap;
        transition: all var(--transition);
    }
    .nav-link i {
        font-size: 16px;
        width: 18px;
        text-align: center;
    }
    .nav-link:hover {
        color: var(--text-main);
        background: var(--border-light);
    }
    .nav-link.active {
        color: var(--primary);
        background: var(--primary-dim);
        border-color: var(--primary-glow);
    }
    .nav-link .nav-badge {
        font-size: 11px;
        background: var(--primary);
        color: #0D0E12;
        border-radius: var(--radius-pill);
        padding: 1px 8px;
        font-weight: 700;
    }
    /* Breadcrumb */
    .breadcrumb-bar {
        padding: 24px 0 0;
    }
    .breadcrumb {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 8px;
        font-size: 14px;
        color: var(--text-secondary);
    }
    .breadcrumb a {
        color: var(--text-secondary);
        transition: color var(--transition);
    }
    .breadcrumb a:hover {
        color: var(--primary);
    }
    .breadcrumb .sep {
        color: var(--text-weak);
        font-size: 12px;
    }
    .breadcrumb .current {
        color: var(--text-main);
        font-weight: 600;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        max-width: 440px;
    }
    /* Article header bento */
    .article-hero {
        padding: 32px 0 8px;
    }
    .article-hero-grid {
        display: grid;
        grid-template-columns: 1.55fr 1fr;
        gap: 22px;
        align-items: stretch;
    }
    .article-hero-main {
        background: var(--bg-card);
        border: 1px solid var(--border-strong);
        border-radius: var(--radius-card);
        padding: 32px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        min-height: 260px;
    }
    .article-hero-title {
        font-size: 34px;
        font-weight: 700;
        line-height: 1.3;
        letter-spacing: -0.02em;
        color: var(--text-main);
        margin-bottom: 16px;
    }
    .article-hero-excerpt {
        font-size: 16px;
        line-height: 1.8;
        color: var(--text-secondary);
        max-width: 680px;
    }
    .article-hero-side {
        display: flex;
        flex-direction: column;
        gap: 16px;
    }
    .article-meta-card {
        background: var(--bg-card);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-card);
        padding: 20px 22px;
        display: flex;
        flex-direction: column;
        gap: 12px;
        flex: 1;
    }
    .article-meta-item {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.5;
    }
    .article-meta-item i {
        width: 18px;
        text-align: center;
        color: var(--primary);
        font-size: 15px;
    }
    .article-meta-item .label {
        color: var(--text-weak);
        flex-shrink: 0;
    }
    .article-tag-row {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        margin-top: 4px;
    }
    .article-cta-strip {
        background: var(--primary-dim);
        border: 1px solid var(--primary-glow);
        border-radius: var(--radius-card);
        padding: 18px 22px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        flex-wrap: wrap;
    }
    .article-cta-text {
        font-size: 14px;
        font-weight: 600;
        color: var(--text-main);
    }
    .article-cta-actions {
        display: flex;
        gap: 10px;
        flex-wrap: wrap;
    }
    /* Article body layout */
    .article-body-layout {
        display: grid;
        grid-template-columns: minmax(0, 720px) 1fr;
        gap: 40px;
        align-items: start;
        padding: 32px 0 56px;
    }
    .article-body {
        background: var(--bg-card);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-card);
        padding: 36px 40px;
        font-size: 16px;
        line-height: 1.85;
        color: var(--text-main);
    }
    .article-body p {
        margin-bottom: 18px;
    }
    .article-body h2 {
        font-size: 24px;
        font-weight: 700;
        line-height: 1.35;
        margin: 32px 0 14px;
        color: var(--text-main);
        letter-spacing: -0.01em;
    }
    .article-body h3 {
        font-size: 19px;
        font-weight: 600;
        line-height: 1.4;
        margin: 26px 0 12px;
        color: var(--text-main);
    }
    .article-body h4 {
        font-size: 16px;
        font-weight: 600;
        line-height: 1.5;
        margin: 22px 0 10px;
        color: var(--text-main);
    }
    .article-body img {
        border-radius: var(--radius-card);
        margin: 20px 0;
        width: 100%;
    }
    .article-body blockquote {
        border-left: 3px solid var(--primary);
        background: var(--primary-dim);
        border-radius: 0 8px 8px 0;
        padding: 14px 20px;
        margin: 20px 0;
        color: var(--text-secondary);
        font-size: 15px;
        line-height: 1.75;
    }
    .article-body ul,
    .article-body ol {
        margin: 16px 0;
        padding-left: 24px;
    }
    .article-body ul li {
        list-style: disc;
        margin-bottom: 8px;
        color: var(--text-secondary);
    }
    .article-body ol li {
        list-style: decimal;
        margin-bottom: 8px;
        color: var(--text-secondary);
    }
    .article-body a {
        color: var(--primary);
        border-bottom: 1px dashed var(--primary-glow);
        transition: color var(--transition), border-color var(--transition);
    }
    .article-body a:hover {
        color: var(--primary-strong);
        border-bottom-color: var(--primary);
    }
    .article-body strong {
        color: var(--text-main);
        font-weight: 700;
    }
    .article-body hr {
        border: none;
        height: 1px;
        background: var(--border-strong);
        margin: 28px 0;
    }
    /* Sidebar */
    .article-sidebar {
        display: flex;
        flex-direction: column;
        gap: 24px;
        position: sticky;
        top: 120px;
    }
    .sidebar-card {
        background: var(--bg-card);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-card);
        padding: 20px 22px;
    }
    .sidebar-card-title {
        font-size: 16px;
        font-weight: 700;
        color: var(--text-main);
        margin-bottom: 12px;
        letter-spacing: -0.01em;
    }
    .sidebar-link-list {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    .sidebar-link-item {
        display: flex;
        align-items: center;
        gap: 10px;
        padding: 9px 12px;
        border-radius: 8px;
        font-size: 14px;
        color: var(--text-secondary);
        transition: all var(--transition);
        border: 1px solid transparent;
    }
    .sidebar-link-item:hover {
        background: var(--bg-card-hover);
        border-color: var(--border-strong);
        color: var(--text-main);
    }
    .sidebar-link-item i {
        width: 16px;
        text-align: center;
        color: var(--primary);
        font-size: 14px;
    }
    /* Related cards */
    .related-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }
    .related-card {
        background: var(--bg-card);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-card);
        overflow: hidden;
        transition: all var(--transition);
        box-shadow: var(--shadow-card);
    }
    .related-card:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-hover);
        border-color: var(--border-strong);
    }
    .related-card-img {
        aspect-ratio: 16 / 10;
        overflow: hidden;
        position: relative;
        background: var(--bg-elevated);
    }
    .related-card-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.35s ease;
    }
    .related-card:hover .related-card-img img {
        transform: scale(1.04);
    }
    .related-card-body {
        padding: 16px 18px 18px;
    }
    .related-card-tag {
        display: inline-block;
        font-size: 12px;
        font-weight: 600;
        color: var(--primary);
        background: var(--primary-dim);
        border-radius: var(--radius-pill);
        padding: 2px 10px;
        margin-bottom: 8px;
    }
    .related-card-title {
        font-size: 16px;
        font-weight: 600;
        line-height: 1.45;
        color: var(--text-main);
        margin-bottom: 6px;
    }
    .related-card-desc {
        font-size: 13px;
        line-height: 1.6;
        color: var(--text-weak);
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    /* Article empty */
    .article-empty {
        background: var(--bg-card);
        border: 1px dashed var(--border-strong);
        border-radius: var(--radius-card);
        padding: 56px 24px;
        text-align: center;
    }
    .article-empty-icon {
        font-size: 48px;
        color: var(--text-weak);
        margin-bottom: 16px;
    }
    .article-empty p {
        font-size: 16px;
        color: var(--text-secondary);
        margin-bottom: 20px;
    }
    /* Prev-next */
    .article-pager {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }
    .pager-card {
        background: var(--bg-card);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-card);
        padding: 18px 22px;
        display: flex;
        align-items: center;
        gap: 14px;
        transition: all var(--transition);
    }
    .pager-card:hover {
        border-color: var(--primary-glow);
        background: var(--bg-card-hover);
        box-shadow: var(--shadow-hover);
    }
    .pager-card.prev {
        justify-content: flex-start;
    }
    .pager-card.next {
        justify-content: flex-end;
        text-align: right;
    }
    .pager-icon {
        width: 36px;
        height: 36px;
        border-radius: 8px;
        background: var(--primary-dim);
        color: var(--primary);
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        font-size: 14px;
    }
    .pager-label {
        font-size: 12px;
        color: var(--text-weak);
        margin-bottom: 2px;
    }
    .pager-title {
        font-size: 14px;
        font-weight: 600;
        color: var(--text-main);
        line-height: 1.45;
    }
    /* Back home cta */
    .back-cta {
        background: var(--bg-card);
        border: 1px solid var(--border-strong);
        border-radius: var(--radius-card);
        padding: 36px 32px;
        text-align: center;
    }
    .back-cta-title {
        font-size: 22px;
        font-weight: 700;
        color: var(--text-main);
        margin-bottom: 10px;
        letter-spacing: -0.01em;
    }
    .back-cta-sub {
        font-size: 15px;
        color: var(--text-secondary);
        margin-bottom: 20px;
        max-width: 520px;
        margin-left: auto;
        margin-right: auto;
        line-height: 1.7;
    }
    .back-cta-actions {
        display: flex;
        gap: 12px;
        justify-content: center;
        flex-wrap: wrap;
    }
    /* Footer */
    .site-footer {
        background: var(--bg-card);
        border-top: 1px solid var(--border-light);
        padding: 48px 0 28px;
        margin-top: 24px;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 1.4fr 1fr 1fr 1fr;
        gap: 32px;
        margin-bottom: 32px;
    }
    .footer-brand .brand-logo {
        font-size: 18px;
        margin-bottom: 12px;
        display: inline-block;
    }
    .footer-brand p {
        font-size: 14px;
        color: var(--text-secondary);
        line-height: 1.7;
        max-width: 300px;
    }
    .footer-col h4 {
        font-size: 15px;
        font-weight: 700;
        color: var(--text-main);
        margin-bottom: 14px;
        letter-spacing: -0.01em;
    }
    .footer-col ul {
        display: flex;
        flex-direction: column;
        gap: 8px;
    }
    .footer-col a {
        font-size: 14px;
        color: var(--text-secondary);
        transition: color var(--transition);
        display: inline-flex;
        align-items: center;
        gap: 6px;
    }
    .footer-col a:hover {
        color: var(--primary);
    }
    .footer-bottom {
        border-top: 1px solid var(--border-light);
        padding-top: 20px;
        font-size: 13px;
        color: var(--text-weak);
        text-align: center;
        line-height: 1.6;
    }
    .footer-bottom .domain {
        color: var(--text-secondary);
        font-weight: 500;
    }
    /* Responsive */
    @media (max-width: 1024px) {
        .article-hero-grid {
            grid-template-columns: 1fr;
        }
        .article-body-layout {
            grid-template-columns: 1fr;
            gap: 24px;
        }
        .article-sidebar {
            position: static;
        }
        .related-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .footer-grid {
            grid-template-columns: 1fr 1fr;
        }
    }
    @media (max-width: 768px) {
        :root {
            --space-section: 36px;
        }
        .section {
            padding: var(--space-section) 0;
        }
        .section-title {
            font-size: 22px;
        }
        .header-brand-row {
            padding: 12px 0 8px;
        }
        .brand-logo {
            font-size: 17px;
        }
        .brand-logo .brand-sub {
            font-size: 12px;
        }
        .nav-link {
            padding: 7px 12px;
            font-size: 13px;
        }
        .article-hero-main {
            padding: 22px 20px;
            min-height: 200px;
        }
        .article-hero-title {
            font-size: 26px;
        }
        .article-body {
            padding: 24px 20px;
            font-size: 15px;
            line-height: 1.8;
        }
        .article-body h2 {
            font-size: 21px;
        }
        .article-body h3 {
            font-size: 17px;
        }
        .breadcrumb .current {
            max-width: 220px;
        }
        .related-grid {
            grid-template-columns: 1fr;
        }
        .article-pager {
            grid-template-columns: 1fr;
        }
        .pager-card.next {
            justify-content: flex-start;
            text-align: left;
        }
        .footer-grid {
            grid-template-columns: 1fr;
            gap: 24px;
        }
    }
    @media (max-width: 520px) {
        :root {
            --space-section: 28px;
        }
        .container {
            padding: 0 16px;
        }
        .section {
            padding: var(--space-section) 0;
        }
        .brand-logo {
            font-size: 15px;
        }
        .brand-logo .brand-sub {
            display: none;
        }
        .search-icon-btn {
            width: 34px;
            height: 34px;
        }
        .nav-link {
            padding: 6px 10px;
            font-size: 12px;
            gap: 5px;
        }
        .nav-link .nav-badge {
            font-size: 10px;
            padding: 1px 6px;
        }
        .article-hero-main {
            padding: 18px 16px;
            min-height: 160px;
        }
        .article-hero-title {
            font-size: 22px;
        }
        .article-hero-excerpt {
            font-size: 14px;
        }
        .article-meta-card {
            padding: 16px;
        }
        .article-cta-strip {
            padding: 14px 16px;
            flex-direction: column;
            align-items: flex-start;
        }
        .article-body {
            padding: 20px 16px;
            font-size: 14px;
            line-height: 1.75;
        }
        .article-body h2 {
            font-size: 19px;
        }
        .article-body h3 {
            font-size: 16px;
        }
        .article-body blockquote {
            padding: 10px 14px;
            font-size: 14px;
        }
        .back-cta {
            padding: 24px 18px;
        }
        .back-cta-title {
            font-size: 19px;
        }
        .section-title {
            font-size: 20px;
        }
        .sidebar-card {
            padding: 16px;
        }
        .footer-grid {
            grid-template-columns: 1fr;
            gap: 20px;
        }
        .footer-col h4 {
            font-size: 14px;
        }
    }

/* roulang page: category1 */
:root {
      --bg-base: #0D0E12;
      --bg-card: #14161C;
      --bg-card-hover: #181B22;
      --bg-elevated: #1A1D24;
      --bg-input: #14161C;
      --primary: #C9971C;
      --primary-strong: #D4A12A;
      --primary-dim: rgba(201, 151, 28, 0.22);
      --primary-glow: rgba(201, 151, 28, 0.33);
      --color-eu: #5B6EE1;
      --color-eu-dim: rgba(91, 110, 225, 0.16);
      --color-cn: #C74B3A;
      --color-cn-dim: rgba(199, 75, 58, 0.16);
      --color-jk: #2FA38B;
      --color-jk-dim: rgba(47, 163, 139, 0.16);
      --text-main: #F2F0EB;
      --text-secondary: #B8B5AE;
      --text-weak: #6E6B64;
      --success: #2F9E6E;
      --warning: #C7A12A;
      --border-light: rgba(242, 240, 235, 0.08);
      --border-strong: rgba(242, 240, 235, 0.16);
      --mask-dark: rgba(13, 14, 18, 0.72);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 999px;
      --shadow-card: 0 2px 8px rgba(0,0,0,0.25);
      --shadow-hover: 0 6px 20px rgba(0,0,0,0.42);
      --shadow-elev: 0 10px 32px rgba(0,0,0,0.5);
      --space-section: 60px;
      --space-card-pad: 18px;
      --font-family: "PingFang SC","Microsoft YaHei","Noto Sans SC","Inter","Roboto",sans-serif;
      --transition: 0.22s ease;
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
    body {
      font-family: var(--font-family);
      background: var(--bg-base);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      min-height: 100vh;
      overflow-x: hidden;
    }
    a { color: inherit; text-decoration: none; transition: color var(--transition), border-color var(--transition), background var(--transition), box-shadow var(--transition), transform var(--transition); }
    img { max-width: 100%; display: block; height: auto; }
    button, input, select, textarea { font-family: inherit; font-size: 100%; }
    button { cursor: pointer; border: none; background: none; color: inherit; }
    ul, ol { list-style: none; }
    .container { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
    .section { padding: var(--space-section) 0; position: relative; }
    .section-alt { background: var(--bg-card); border-top: 1px solid var(--border-light); border-bottom: 1px solid var(--border-light); }
    .section-head { margin-bottom: 32px; }
    .section-tag { display: inline-block; font-size: 13px; font-weight: 600; color: var(--primary); background: var(--primary-dim); border-radius: var(--radius-pill); padding: 4px 14px; margin-bottom: 10px; letter-spacing: 0.03em; }
    .section-title { font-size: 28px; font-weight: 700; line-height: 1.3; color: var(--text-main); letter-spacing: -0.01em; }
    .section-sub { font-size: 15px; color: var(--text-secondary); margin-top: 10px; max-width: 720px; line-height: 1.7; }
    .section-title .hl { color: var(--primary); }
    .section-title .hl-eu { color: var(--color-eu); }
    .section-title .hl-cn { color: var(--color-cn); }
    .section-title .hl-jk { color: var(--color-jk); }
    /* Header */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(13, 14, 18, 0.88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-light);
      transition: border-color var(--transition), box-shadow var(--transition);
    }
    .site-header.scrolled { border-bottom-color: var(--border-strong); box-shadow: 0 4px 20px rgba(0,0,0,0.4); }
    .header-inner { display: flex; flex-direction: column; }
    .header-brand-row { display: flex; align-items: center; justify-content: space-between; padding: 14px 0 10px; gap: 16px; }
    .brand { display: flex; align-items: center; gap: 12px; }
    .brand-logo { font-size: 20px; font-weight: 700; letter-spacing: -0.02em; line-height: 1.25; color: var(--text-main); }
    .brand-logo .brand-main { color: var(--primary); }
    .brand-logo .brand-sub { display: block; font-size: 13px; font-weight: 500; color: var(--text-secondary); letter-spacing: 0.04em; }
    .header-action { display: flex; align-items: center; gap: 12px; }
    .search-icon-btn { width: 38px; height: 38px; border-radius: 8px; border: 1px solid var(--border-strong); display: flex; align-items: center; justify-content: center; color: var(--text-secondary); transition: all var(--transition); }
    .search-icon-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-dim); }
    .nav-bar { display: flex; align-items: center; gap: 6px; padding: 8px 0 12px; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
    .nav-bar::-webkit-scrollbar { display: none; }
    .nav-link { display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px; border-radius: 8px; font-size: 14px; font-weight: 600; color: var(--text-secondary); border: 1px solid transparent; white-space: nowrap; transition: all var(--transition); }
    .nav-link i { font-size: 16px; width: 18px; text-align: center; }
    .nav-link:hover { color: var(--text-main); background: var(--border-light); }
    .nav-link.active { color: var(--primary); background: var(--primary-dim); border-color: var(--primary-glow); }
    .nav-link .nav-badge { font-size: 11px; background: var(--primary); color: #0D0E12; border-radius: var(--radius-pill); padding: 1px 8px; font-weight: 700; }
    /* Category Header */
    .category-header { padding: 48px 0 36px; background: var(--bg-base); border-bottom: 1px solid var(--border-light); }
    .breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-secondary); margin-bottom: 18px; flex-wrap: wrap; }
    .breadcrumb a { color: var(--text-secondary); transition: color var(--transition); }
    .breadcrumb a:hover { color: var(--primary); }
    .breadcrumb .sep { color: var(--text-weak); }
    .breadcrumb .current { color: var(--primary); font-weight: 600; }
    .category-header-grid { display: grid; grid-template-columns: 1.25fr 0.75fr; gap: 32px; align-items: center; }
    .category-header h1 { font-size: 36px; font-weight: 700; line-height: 1.3; letter-spacing: -0.02em; color: var(--text-main); margin-bottom: 12px; }
    .category-header h1 .hl { color: var(--primary); }
    .category-header .category-sub { font-size: 16px; color: var(--text-secondary); line-height: 1.8; max-width: 680px; }
    .category-header-stat { display: flex; gap: 16px; align-items: center; background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); padding: 18px 22px; }
    .category-header-stat .stat-icon { width: 52px; height: 52px; border-radius: 12px; background: var(--primary-dim); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0; }
    .category-header-stat .stat-info { flex: 1; }
    .category-header-stat .stat-num { font-size: 26px; font-weight: 700; color: var(--text-main); line-height: 1.2; }
    .category-header-stat .stat-label { font-size: 13px; color: var(--text-secondary); }
    /* Buttons */
    .btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 11px 22px; border-radius: var(--radius-btn); font-size: 15px; font-weight: 600; line-height: 1; transition: all var(--transition); border: 1px solid transparent; cursor: pointer; }
    .btn-primary { background: var(--primary); color: #0D0E12; }
    .btn-primary:hover { background: var(--primary-strong); transform: translateY(-1px); box-shadow: var(--shadow-hover); }
    .btn-primary:active { transform: translateY(0); background: var(--primary); }
    .btn-primary:focus-visible { outline: 2px solid var(--primary-glow); outline-offset: 2px; }
    .btn-secondary { background: transparent; border-color: var(--border-strong); color: var(--text-secondary); }
    .btn-secondary:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-dim); }
    .btn-secondary:focus-visible { outline: 2px solid var(--primary-glow); outline-offset: 2px; }
    .btn-lg { padding: 14px 30px; font-size: 16px; }
    .btn-sm { padding: 7px 14px; font-size: 13px; }
    /* Zone Grid */
    .zone-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .zone-card { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); padding: 20px; transition: all var(--transition); position: relative; overflow: hidden; }
    .zone-card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: transparent; transition: background var(--transition); }
    .zone-card:hover { border-color: var(--border-strong); background: var(--bg-card-hover); box-shadow: var(--shadow-hover); transform: translateY(-2px); }
    .zone-card:hover::before { background: var(--primary); }
    .zone-card-top { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
    .zone-card-icon { width: 42px; height: 42px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; }
    .zone-card-icon.eu { background: var(--color-eu-dim); color: var(--color-eu); }
    .zone-card-icon.cn { background: var(--color-cn-dim); color: var(--color-cn); }
    .zone-card-icon.jk { background: var(--color-jk-dim); color: var(--color-jk); }
    .zone-card-icon.primary { background: var(--primary-dim); color: var(--primary); }
    .zone-card h3 { font-size: 17px; font-weight: 600; color: var(--text-main); }
    .zone-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.65; }
    .zone-card .zone-meta { margin-top: 10px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
    .zone-card .badge { font-size: 12px; padding: 3px 10px; border-radius: var(--radius-pill); font-weight: 600; }
    .badge-eu { background: var(--color-eu-dim); color: var(--color-eu); }
    .badge-cn { background: var(--color-cn-dim); color: var(--color-cn); }
    .badge-jk { background: var(--color-jk-dim); color: var(--color-jk); }
    .badge-primary { background: var(--primary-dim); color: var(--primary); }
    .badge-neutral { background: var(--border-light); color: var(--text-secondary); }
    /* Feature Cards */
    .feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
    .feature-card { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); padding: 20px; transition: all var(--transition); }
    .feature-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-card); transform: translateY(-2px); }
    .feature-card .feature-icon { width: 44px; height: 44px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 19px; margin-bottom: 12px; }
    .feature-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 6px; color: var(--text-main); }
    .feature-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.65; }
    /* Metrics */
    .metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
    .metric-card { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); padding: 22px; text-align: center; transition: all var(--transition); }
    .metric-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-card); }
    .metric-num { font-size: 34px; font-weight: 700; color: var(--text-main); line-height: 1.2; }
    .metric-unit { font-size: 14px; font-weight: 500; color: var(--primary); margin-left: 4px; }
    .metric-label { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }
    /* Topics */
    .topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .topic-card { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); overflow: hidden; transition: all var(--transition); }
    .topic-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-hover); transform: translateY(-3px); }
    .topic-card-img { aspect-ratio: 16/10; overflow: hidden; background: var(--bg-elevated); }
    .topic-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition); }
    .topic-card:hover .topic-card-img img { transform: scale(1.04); }
    .topic-card-body { padding: 18px; }
    .topic-card-body h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; color: var(--text-main); }
    .topic-card-body p { font-size: 14px; color: var(--text-secondary); line-height: 1.65; }
    .topic-card-link { margin-top: 10px; display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 600; color: var(--primary); }
    .topic-card-link i { transition: transform var(--transition); }
    .topic-card-link:hover i { transform: translateX(4px); }
    /* News list */
    .news-list { display: flex; flex-direction: column; gap: 14px; }
    .news-card { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); overflow: hidden; transition: all var(--transition); }
    .news-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-card); }
    .news-card-link { display: flex; gap: 16px; padding: 14px; }
    .news-card-img { width: 132px; height: 88px; flex-shrink: 0; border-radius: 8px; overflow: hidden; background: var(--bg-elevated); }
    .news-card-img img { width: 100%; height: 100%; object-fit: cover; }
    .news-card-body { flex: 1; display: flex; flex-direction: column; }
    .news-card-title { font-size: 17px; font-weight: 600; color: var(--text-main); margin-bottom: 6px; line-height: 1.4; }
    .news-card-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: 8px; }
    .news-card-meta { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--text-weak); margin-top: auto; flex-wrap: wrap; }
    .news-card-time { display: inline-flex; align-items: center; gap: 5px; }
    .news-card-tag { font-size: 12px; padding: 2px 10px; border-radius: var(--radius-pill); background: var(--primary-dim); color: var(--primary); font-weight: 600; }
    .news-card-more { margin-left: auto; color: var(--primary); font-weight: 600; font-size: 13px; }
    .news-empty { text-align: center; padding: 40px 20px; color: var(--text-weak); font-size: 16px; }
    .news-more { margin-top: 20px; text-align: center; }
    /* FAQ */
    .faq-list { display: flex; flex-direction: column; gap: 12px; max-width: 860px; margin: 0 auto; }
    .faq-item { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); overflow: hidden; transition: all var(--transition); }
    .faq-item.active { background: var(--bg-card-hover); border-color: var(--border-strong); box-shadow: var(--shadow-card); }
    .faq-question { width: 100%; display: flex; align-items: center; gap: 14px; padding: 16px 18px; cursor: pointer; font-size: 16px; font-weight: 600; color: var(--text-main); text-align: left; transition: color var(--transition); }
    .faq-question:hover { color: var(--primary); }
    .faq-question .faq-index { width: 28px; height: 28px; border-radius: 50%; background: var(--primary-dim); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 700; flex-shrink: 0; }
    .faq-question .faq-toggle { margin-left: auto; width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--border-strong); display: flex; align-items: center; justify-content: center; font-size: 13px; color: var(--text-secondary); transition: all var(--transition); flex-shrink: 0; }
    .faq-item.active .faq-question .faq-toggle { border-color: var(--primary); color: var(--primary); transform: rotate(45deg); }
    .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease; padding: 0 18px; }
    .faq-item.active .faq-answer { max-height: 400px; padding: 0 18px 16px; }
    .faq-answer p { font-size: 15px; color: var(--text-secondary); line-height: 1.7; }
    /* Form */
    .cta-card { background: var(--bg-card); border: 1px solid var(--border-light); border-radius: var(--radius-card); padding: 32px; display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; }
    .cta-left h3 { font-size: 24px; font-weight: 700; margin-bottom: 10px; color: var(--text-main); }
    .cta-left h3 .hl { color: var(--primary); }
    .cta-left p { font-size: 15px; color: var(--text-secondary); line-height: 1.7; }
    .cta-form .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 14px; }
    .cta-form .form-field { display: flex; flex-direction: column; gap: 6px; }
    .cta-form label { font-size: 13px; font-weight: 500; color: var(--text-secondary); }
    .cta-form input, .cta-form select, .cta-form textarea { background: var(--bg-input); border: 1px solid var(--border-strong); border-radius: var(--radius-btn); padding: 10px 14px; color: var(--text-main); font-size: 14px; transition: border-color var(--transition), box-shadow var(--transition); outline: none; }
    .cta-form input:focus, .cta-form select:focus, .cta-form textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-dim); }
    .cta-form textarea { resize: vertical; min-height: 80px; }
    .cta-form .form-full { grid-column: 1 / -1; }
    .cta-form .btn { width: 100%; }
    /* Back home */
    .back-home { text-align: center; }
    .back-home-btn { display: inline-flex; align-items: center; gap: 10px; padding: 16px 36px; background: var(--primary); color: #0D0E12; border-radius: var(--radius-btn); font-size: 18px; font-weight: 700; transition: all var(--transition); }
    .back-home-btn:hover { background: var(--primary-strong); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
    .back-home-btn i { font-size: 20px; }
    /* Footer */
    .site-footer { background: var(--bg-card); border-top: 1px solid var(--border-light); padding: 48px 0 24px; margin-top: 0; }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
    .footer-brand .brand-logo { font-size: 18px; }
    .footer-brand p { font-size: 14px; color: var(--text-secondary); margin-top: 10px; line-height: 1.7; }
    .footer-col h4 { font-size: 16px; font-weight: 600; color: var(--text-main); margin-bottom: 14px; }
    .footer-col ul { display: flex; flex-direction: column; gap: 8px; }
    .footer-col ul li a { font-size: 14px; color: var(--text-secondary); transition: color var(--transition); }
    .footer-col ul li a:hover { color: var(--primary); }
    .footer-bottom { border-top: 1px solid var(--border-light); padding-top: 20px; text-align: center; font-size: 13px; color: var(--text-weak); }
    .footer-bottom .domain { color: var(--text-secondary); }
    /* Scroll to top */
    .scroll-top { position: fixed; right: 24px; bottom: 24px; width: 44px; height: 44px; border-radius: 50%; background: var(--bg-elevated); border: 1px solid var(--border-strong); color: var(--text-main); display: flex; align-items: center; justify-content: center; font-size: 18px; z-index: 90; opacity: 0; visibility: hidden; transition: all var(--transition); }
    .scroll-top.visible { opacity: 1; visibility: visible; }
    .scroll-top:hover { background: var(--primary); color: #0D0E12; border-color: var(--primary); }
    /* Responsive */
    @media (max-width: 1024px) {
      .feature-grid { grid-template-columns: repeat(2, 1fr); }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .category-header-grid { grid-template-columns: 1fr; }
      .category-header-stat { max-width: 360px; }
    }
    @media (max-width: 768px) {
      :root { --space-section: 40px; }
      .container { padding: 0 16px; }
      .section-title { font-size: 22px; }
      .category-header h1 { font-size: 26px; }
      .zone-grid { grid-template-columns: repeat(2, 1fr); }
      .topic-grid { grid-template-columns: 1fr; }
      .cta-card { grid-template-columns: 1fr; padding: 24px; }
      .cta-form .form-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .news-card-link { flex-direction: column; padding: 12px; }
      .news-card-img { width: 100%; height: 160px; }
    }
    @media (max-width: 520px) {
      .container { padding: 0 14px; }
      .brand-logo { font-size: 17px; }
      .brand-logo .brand-sub { display: none; }
      .zone-grid { grid-template-columns: 1fr; }
      .feature-grid { grid-template-columns: 1fr; }
      .metrics-grid { grid-template-columns: 1fr 1fr; }
      .metric-num { font-size: 26px; }
      .footer-grid { grid-template-columns: 1fr; }
      .category-header h1 { font-size: 23px; }
      .btn-lg { padding: 12px 22px; font-size: 15px; }
      .nav-link { padding: 7px 12px; font-size: 13px; }
    }