/* roulang page: index */
:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --secondary:#14b8a6;
  --dark:#0f172a;
  --body:#f2f6fc;
  --card:#ffffff;
  --text:#1e293b;
  --muted:#64748b;
  --border:#e2e8f0;
  --radius:18px;
  --radius-sm:12px;
  --shadow:0 10px 30px rgba(15,23,42,.07);
  --shadow-lg:0 24px 60px rgba(15,23,42,.12);
  --space:clamp(64px,8vw,120px);
  --container:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--body);color:var(--text);line-height:1.75;font-size:16px}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}
button,input,select,textarea{font-family:inherit}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
.text-center{text-align:center}
.text-muted{color:var(--muted)}
.section{padding:var(--space) 0}
.section-head{max-width:720px;margin:0 auto 48px;text-align:center}
.section-head .tag{display:inline-block;background:rgba(37,99,235,.08);color:var(--primary);padding:4px 16px;border-radius:100px;font-size:.85rem;font-weight:700;margin-bottom:14px}
.section-head h2{font-size:clamp(1.8rem,3.4vw,2.5rem);font-weight:800;color:var(--dark);line-height:1.3;margin-bottom:12px}
.section-head p{color:var(--muted);font-size:1.05rem}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:100px;font-weight:700;font-size:.95rem;transition:all .25s;border:none;cursor:pointer}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 8px 24px rgba(37,99,235,.3)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 12px 30px rgba(37,99,235,.4)}
.btn-outline{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.7)}
.btn-outline:hover{background:rgba(255,255,255,.15);transform:translateY(-2px)}
.btn-light{background:#fff;color:var(--primary);box-shadow:0 8px 24px rgba(15,23,42,.12)}
.btn-light:hover{background:#f0f4ff;transform:translateY(-2px)}
/* ===== Header / Nav ===== */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.72);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border-bottom:1px solid rgba(226,232,240,.5);transition:background .3s ease,box-shadow .3s ease}
.site-header.scrolled{background:rgba(255,255,255,.94);box-shadow:0 6px 24px rgba(15,23,42,.08)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{font-size:1.35rem;font-weight:800;color:var(--dark);letter-spacing:.5px}
.logo span{color:var(--primary)}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:.93rem;font-weight:600;color:var(--text);padding:8px 2px;position:relative;transition:color .2s}
.nav-links a::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--primary);transition:width .25s}
.nav-links a:hover{color:var(--primary)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-links a.active{color:var(--primary)}
.nav-toggle{display:none;background:none;border:none;font-size:1.5rem;color:var(--dark);cursor:pointer}
.nav-icon{width:26px;height:2px;background:var(--dark);position:relative;display:inline-block}
.nav-icon::before,.nav-icon::after{content:"";position:absolute;left:0;width:26px;height:2px;background:var(--dark);transition:.25s}
.nav-icon::before{top:-7px}
.nav-icon::after{top:7px}
/* ===== Hero ===== */
.hero{position:relative;min-height:92vh;display:flex;align-items:center;background:linear-gradient(135deg,rgba(10,20,35,.92),rgba(29,78,162,.72)),url('/assets/images/backpic/back-1.png') center/cover no-repeat;color:#fff;padding:140px 0 80px}
.hero-content{max-width:820px}
.hero-badge{display:inline-block;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);padding:6px 18px;border-radius:100px;font-size:.85rem;font-weight:600;margin-bottom:22px;backdrop-filter:blur(8px)}
.hero h1{font-size:clamp(2.2rem,5vw,3.8rem);font-weight:800;line-height:1.22;margin-bottom:20px}
.hero h1 span{color:var(--secondary)}
.hero p{font-size:clamp(1rem,1.6vw,1.2rem);color:rgba(255,255,255,.88);max-width:660px;margin-bottom:34px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-stats{display:flex;gap:36px;margin-top:60px;flex-wrap:wrap}
.hero-stat{display:flex;align-items:center;gap:12px}
.hero-stat i{font-size:1.6rem;color:var(--secondary)}
.hero-stat div span{display:block;font-size:1.3rem;font-weight:800}
.hero-stat div small{color:rgba(255,255,255,.75);font-size:.85rem}
/* ===== About ===== */
.about-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:56px;align-items:center}
.about-text h3{font-size:1.8rem;font-weight:800;color:var(--dark);margin-bottom:18px}
.about-text p{color:var(--muted);margin-bottom:16px}
.about-list{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px}
.about-list li{display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 14px;font-size:.92rem;font-weight:600}
.about-list li i{color:var(--secondary)}
.about-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-lg);position:relative}
.about-img img{width:100%;height:380px;object-fit:cover}
/* ===== Categories ===== */
.cat-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.cat-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:38px 34px;position:relative;transition:all .3s;overflow:hidden}
.cat-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary),var(--secondary));opacity:0;transition:.3s}
.cat-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.cat-card:hover::before{opacity:1}
.cat-icon{width:60px;height:60px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:20px}
.cat-card h3{font-size:1.35rem;font-weight:800;color:var(--dark);margin-bottom:10px}
.cat-card p{color:var(--muted);font-size:.95rem;margin-bottom:18px}
.cat-card .btn{padding:9px 22px;font-size:.88rem}
/* ===== News ===== */
.news-section{background:var(--card)}
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.news-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:all .3s;gap:10px}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.news-cat{display:inline-block;background:rgba(37,99,235,.08);color:var(--primary);font-size:.78rem;font-weight:700;padding:3px 12px;border-radius:100px;width:fit-content}
.news-card h3{font-size:1.12rem;font-weight:700;color:var(--dark);line-height:1.4}
.news-card h3:hover{color:var(--primary)}
.news-card p{color:var(--muted);font-size:.9rem;flex:1}
.news-time{font-size:.82rem;color:var(--muted)}
.news-empty{background:#f8fafc;border:1px dashed var(--border);border-radius:var(--radius);padding:48px;text-align:center;color:var(--muted)}
/* ===== Steps ===== */
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;counter-reset:step}
.step-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:40px 30px;text-align:center;position:relative;transition:all .3s}
.step-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.step-num{width:52px;height:52px;margin:0 auto 18px;border-radius:50%;background:var(--primary);color:#fff;font-size:1.3rem;font-weight:800;display:flex;align-items:center;justify-content:center}
.step-card h3{font-size:1.15rem;font-weight:800;color:var(--dark);margin-bottom:10px}
.step-card p{color:var(--muted);font-size:.9rem}
/* ===== Stats ===== */
.stats-band{background:linear-gradient(135deg,var(--dark),#172e4f);color:#fff;border-radius:var(--radius);padding:52px 40px;display:grid;grid-template-columns:repeat(4,1fr);gap:32px;text-align:center}
.stat-item i{font-size:2rem;color:var(--secondary);margin-bottom:10px}
.stat-item .num{font-size:2rem;font-weight:800;display:block}
.stat-item .label{color:rgba(255,255,255,.7);font-size:.9rem}
/* ===== Features ===== */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:32px 26px;transition:all .3s}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.feature-card i{font-size:1.6rem;color:var(--primary);margin-bottom:14px}
.feature-card h3{font-size:1.05rem;font-weight:800;color:var(--dark);margin-bottom:8px}
.feature-card p{color:var(--muted);font-size:.88rem}
/* ===== FAQ ===== */
.faq-list{max-width:860px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:16px;transition:all .25s}
.faq-item summary{cursor:pointer;padding:22px 28px;font-weight:700;color:var(--dark);display:flex;align-items:center;justify-content:space-between;gap:16px;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary i{color:var(--muted);transition:transform .25s;font-size:.9rem}
.faq-item[open] summary i{transform:rotate(180deg);color:var(--primary)}
.faq-item .faq-body{padding:0 28px 22px;color:var(--muted);font-size:.95rem}
/* ===== CTA ===== */
.cta-band{position:relative;overflow:hidden;border-radius:var(--radius);padding:64px 48px;color:#fff;text-align:center;background:linear-gradient(135deg,rgba(15,23,42,.92),rgba(29,78,162,.8)),url('/assets/images/backpic/back-2.png') center/cover no-repeat}
.cta-band h2{font-size:clamp(1.8rem,3vw,2.6rem);font-weight:800;margin-bottom:14px}
.cta-band p{color:rgba(255,255,255,.85);max-width:600px;margin:0 auto 30px}
.cta-band .btn{margin:0 8px}
/* ===== Footer ===== */
.site-footer{background:var(--dark);color:rgba(255,255,255,.75);padding:56px 0 30px}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand h3{color:#fff;font-size:1.3rem;font-weight:800;margin-bottom:12px}
.footer-brand p{font-size:.9rem;max-width:360px}
.footer-col h4{color:#fff;font-size:1rem;font-weight:700;margin-bottom:16px}
.footer-col a{display:block;color:rgba(255,255,255,.65);font-size:.9rem;padding:5px 0;transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:24px;text-align:center;font-size:.85rem;color:rgba(255,255,255,.5)}
/* ===== Responsive ===== */
@media screen and (max-width:1024px){
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .stats-band{grid-template-columns:repeat(2,1fr)}
  .about-grid{grid-template-columns:1fr}
  .about-img img{height:300px}
}
@media screen and (max-width:768px){
  .nav-links{position:fixed;top:72px;left:0;right:0;background:#fff;flex-direction:column;align-items:flex-start;padding:24px 30px;gap:18px;border-bottom:1px solid var(--border);box-shadow:var(--shadow);transform:translateY(-120%);transition:transform .3s;z-index:99}
  .nav-links.open{transform:translateY(0)}
  .nav-toggle{display:block}
  .hero{padding-top:120px}
  .cat-grid,.news-grid,.steps-grid{grid-template-columns:1fr}
  .hero-actions{flex-direction:column;align-items:flex-start}
  .footer-top{grid-template-columns:1fr;gap:30px}
}
@media screen and (max-width:520px){
  .features-grid{grid-template-columns:1fr}
  .stats-band{grid-template-columns:1fr}
  .about-list{grid-template-columns:1fr}
  .container{padding:0 18px}
  .hero h1{font-size:2rem}
  .btn{padding:10px 22px;font-size:.9rem}
}

/* roulang page: category1 */
/* ========== 设计变量 ========== */
:root {
  --primary: #1a5cf0;
  --primary-light: #4d8df7;
  --primary-dark: #0e3fa8;
  --accent: #00b4d8;
  --accent-light: #66e0f5;
  --bg-light: #f4f7fc;
  --bg-white: #ffffff;
  --bg-deep: #0b1a33;
  --bg-deep-soft: #132a4a;
  --text-main: #16233a;
  --text-muted: #5b6b85;
  --text-light: #8a9ab5;
  --border: #e3eaf2;
  --radius: 14px;
  --radius-lg: 24px;
  --shadow-sm: 0 2px 10px rgba(22,35,58,0.06);
  --shadow-md: 0 8px 28px rgba(22,35,58,0.09);
  --shadow-lg: 0 18px 44px rgba(22,35,58,0.14);
  --tr: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-h: 72px;
  --section-space: 88px;
}

/* ========== 基础 Reset ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.75;
  color: var(--text-main);
  background: var(--bg-light);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: var(--tr); }
img { max-width: 100%; display: inline-block; vertical-align: middle; }
button, input { font-family: inherit; border: none; outline: none; background: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 800; color: var(--text-main); }
p { margin-bottom: 0; }

/* ========== 容器 ========== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}
.section { padding: var(--section-space) 0; position: relative; }
.section-alt { background: var(--bg-white); }
.alt-bg { background: var(--bg-white); }

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 30px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--tr);
  line-height: 1.4;
  border: 2px solid transparent;
  letter-spacing: 0.02em;
}
.btn i { font-size: 14px; }
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 6px 20px rgba(26, 92, 240, 0.3);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 10px 28px rgba(26, 92, 240, 0.4); }
.btn-outline {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(4px);
}
.btn-outline:hover { background: rgba(255, 255, 255, 0.24); transform: translateY(-2px); }
.btn-primary:focus, .btn-outline:focus { outline: 3px solid rgba(26, 92, 240, 0.35); outline-offset: 2px; }

/* ========== Header 导航 ========== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.68);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.35);
  transition: var(--tr);
}
.site-header.scrolled {
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 4px 24px rgba(22, 35, 58, 0.08);
  border-bottom-color: var(--border);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  width: 100%;
}
.logo {
  font-size: 24px;
  font-weight: 800;
  color: var(--primary-dark);
  display: flex;
  align-items: baseline;
  gap: 2px;
  letter-spacing: -0.02em;
}
.logo span { color: var(--accent); font-weight: 700; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 40px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--tr);
  position: relative;
}
.nav-links a:hover {
  color: var(--primary);
  background: rgba(26, 92, 240, 0.06);
}
.nav-links a.active {
  color: var(--primary);
  background: rgba(26, 92, 240, 0.1);
  font-weight: 600;
}
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  position: relative;
  background: rgba(26, 92, 240, 0.08);
}
.nav-icon, .nav-icon::before, .nav-icon::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background: var(--primary-dark);
  border-radius: 2px;
  position: absolute;
  left: 12px;
  transition: var(--tr);
}
.nav-icon { top: 21px; }
.nav-icon::before { top: -6px; }
.nav-icon::after { top: 6px; }
.nav-toggle.menu-open .nav-icon { background: transparent; }
.nav-toggle.menu-open .nav-icon::before { transform: rotate(45deg); top: 0; }
.nav-toggle.menu-open .nav-icon::after { transform: rotate(-45deg); top: 0; }

/* ========== Hero 页面首屏 ========== */
.page-hero {
  position: relative;
  padding: calc(var(--nav-h) + 72px) 0 90px;
  background: linear-gradient(135deg, rgba(7, 18, 38, 0.92) 0%, rgba(15, 35, 68, 0.82) 55%, rgba(22, 56, 108, 0.7) 100%),
              url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  color: #fff;
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute;
  bottom: -120px; right: -120px;
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(0, 180, 216, 0.3) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 760px;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 22px;
}
.breadcrumb a { color: rgba(255, 255, 255, 0.85); }
.breadcrumb a:hover { color: var(--accent-light); }
.breadcrumb i { font-size: 11px; opacity: 0.6; }
.hero-title {
  font-size: 42px;
  font-weight: 800;
  color: #fff;
  line-height: 1.25;
  margin-bottom: 18px;
  letter-spacing: -0.01em;
}
.hero-title .highlight { color: var(--accent-light); }
.hero-subtitle {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: 34px;
  line-height: 1.8;
  max-width: 640px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 26px;
  margin-top: 42px;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}
.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
}
.hero-meta-item i { color: var(--accent-light); font-size: 16px; }

/* ========== 板块标题 ========== */
.section-eyebrow {
  display: inline-block;
  background: rgba(26, 92, 240, 0.08);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  padding: 6px 18px;
  border-radius: 50px;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}
.section-title-wrap { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.section-title {
  font-size: 34px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}
.section-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ========== 流程卡片 ========== */
.process-section { background: var(--bg-light); }
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.process-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 36px 28px 32px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--tr);
  position: relative;
  overflow: hidden;
}
.process-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--tr);
}
.process-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(26, 92, 240, 0.2); }
.process-card:hover::before { transform: scaleX(1); }
.process-num {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  box-shadow: 0 8px 20px rgba(26, 92, 240, 0.25);
}
.process-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.process-card p { font-size: 14px; color: var(--text-muted); line-height: 1.75; }

/* ========== 登录方式卡片 ========== */
.device-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.device-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 38px 28px;
  border: 1px solid var(--border);
  text-align: center;
  transition: var(--tr);
  box-shadow: var(--shadow-sm);
}
.device-card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow-md);
  border-color: rgba(0, 180, 216, 0.3);
}
.device-icon {
  width: 68px; height: 68px;
  margin: 0 auto 22px;
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(26, 92, 240, 0.1), rgba(0, 180, 216, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: var(--primary);
  transition: var(--tr);
}
.device-card:hover .device-icon {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  transform: scale(1.05);
}
.device-card h3 { font-size: 18px; margin-bottom: 10px; font-weight: 700; }
.device-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; margin-bottom: 16px; }
.device-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  background: rgba(26, 92, 240, 0.08);
  padding: 4px 14px;
  border-radius: 30px;
}

/* ========== 问题排查 ========== */
.trouble-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.trouble-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.trouble-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: var(--tr);
}
.trouble-image:hover img { transform: scale(1.02); }
.trouble-image-tag {
  position: absolute;
  top: 20px; left: 20px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
  padding: 6px 18px;
  border-radius: 30px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}
.trouble-intro {
  margin-bottom: 28px;
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
}
.trouble-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.trouble-item {
  display: flex;
  gap: 18px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  transition: var(--tr);
  box-shadow: var(--shadow-sm);
}
.trouble-item:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(26, 92, 240, 0.2);
  transform: translateX(4px);
}
.trouble-item-icon {
  width: 44px; height: 44px;
  flex-shrink: 0;
  border-radius: 12px;
  background: rgba(26, 92, 240, 0.08);
  color: var(--primary);
  font-size: 17px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.trouble-item-info h4 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.trouble-item-info p { font-size: 14px; color: var(--text-muted); line-height: 1.65; }

/* ========== 数据统计带 ========== */
.stats-band {
  position: relative;
  background: linear-gradient(135deg, var(--bg-deep) 0%, var(--bg-deep-soft) 100%);
  padding: 72px 0;
  color: #fff;
  overflow: hidden;
}
.stats-band::before {
  content: "";
  position: absolute;
  top: -80px; right: -60px;
  width: 280px; height: 280px;
  background: radial-gradient(circle, rgba(26, 92, 240, 0.35), transparent 70%);
  border-radius: 50%;
}
.stats-band::after {
  content: "";
  position: absolute;
  bottom: -40px; left: 30%;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(0, 180, 216, 0.2), transparent 70%);
  border-radius: 50%;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  position: relative;
  z-index: 2;
}
.stat-item {
  text-align: center;
  padding: 10px;
}
.stat-num {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.1;
  background: linear-gradient(135deg, #fff, var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.75);
  font-weight: 500;
}

/* ========== FAQ 手风琴 ========== */
.faq-wrap {
  max-width: 820px;
  margin: 0 auto;
}
.faq-wrap .accordion {
  list-style: none;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-wrap .accordion-item {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--tr);
  box-shadow: var(--shadow-sm);
}
.faq-wrap .accordion-item:hover { border-color: rgba(26, 92, 240, 0.2); box-shadow: var(--shadow-md); }
.faq-wrap .accordion-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 26px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: var(--tr);
}
.faq-wrap .accordion-title:hover { color: var(--primary); }
.faq-wrap .accordion-title::after {
  content: "\f078";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  font-size: 13px;
  color: var(--text-light);
  transition: var(--tr);
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(26, 92, 240, 0.06);
}
.faq-wrap .accordion-item.is-active .accordion-title { color: var(--primary); }
.faq-wrap .accordion-item.is-active .accordion-title::after {
  color: var(--primary);
  transform: rotate(180deg);
  background: rgba(26, 92, 240, 0.12);
}
.faq-wrap .accordion-content {
  padding: 0 26px 22px;
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
  border-top: 1px solid var(--border);
  padding-top: 16px;
  display: none;
}
.faq-wrap .accordion-item.is-active .accordion-content { display: block; }

/* ========== CTA 区块 ========== */
.cta-section {
  padding: 40px 0 90px;
  background: var(--bg-light);
}
.cta-band {
  background: linear-gradient(135deg, var(--primary) 0%, #0e3fa8 60%, #0b2d70 100%);
  border-radius: var(--radius-lg);
  padding: 56px 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  box-shadow: 0 20px 50px rgba(14, 63, 168, 0.35);
  position: relative;
  overflow: hidden;
}
.cta-band::after {
  content: "";
  position: absolute;
  right: -60px; bottom: -60px;
  width: 200px; height: 200px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
}
.cta-text { position: relative; z-index: 2; flex: 1; min-width: 260px; }
.cta-text h3 {
  font-size: 26px;
  color: #fff;
  margin-bottom: 10px;
  font-weight: 800;
}
.cta-text p {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.7;
}
.cta-actions { position: relative; z-index: 2; display: flex; gap: 14px; flex-wrap: wrap; }
.btn-white {
  background: #fff;
  color: var(--primary-dark);
  border: 2px solid transparent;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
}
.btn-white:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0, 0, 0, 0.2); }
.btn-ghost {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.7);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.15); transform: translateY(-2px); border-color: #fff; }

/* ========== 页脚 ========== */
.site-footer {
  background: var(--bg-deep);
  color: rgba(255, 255, 255, 0.75);
  padding: 64px 0 0;
  font-size: 14px;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 54px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-brand h3 {
  font-size: 24px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}
.footer-brand h3 span { color: var(--accent-light); }
.footer-brand p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.8;
  max-width: 380px;
}
.footer-col h4 {
  font-size: 16px;
  color: #fff;
  font-weight: 700;
  margin-bottom: 20px;
}
.footer-col a {
  display: block;
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
  padding: 5px 0;
  transition: var(--tr);
}
.footer-col a:hover { color: var(--accent-light); padding-left: 6px; }
.footer-bottom {
  padding: 28px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  margin-top: 0;
}

/* ========== Enter/Active 焦点状态 ========== */
a:focus-visible, button:focus-visible {
  outline: 3px solid rgba(26, 92, 240, 0.4);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  :root { --section-space: 72px; }
  .process-grid, .device-grid { grid-template-columns: repeat(2, 1fr); }
  .trouble-wrap { grid-template-columns: 1fr; gap: 36px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 30px; }
  .hero-title { font-size: 36px; }
  .section-title { font-size: 30px; }
  .cta-band { padding: 44px 36px; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 20px 24px 24px;
    box-shadow: 0 20px 40px rgba(22, 35, 58, 0.16);
    gap: 6px;
    transform: translateY(-120%) scale(0.98);
    opacity: 0;
    pointer-events: none;
    transition: var(--tr);
    border-bottom: 1px solid var(--border);
    border-radius: 0 0 var(--radius) var(--radius);
  }
  .nav-links.open {
    transform: translateY(0) scale(1);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a {
    display: block;
    padding: 12px 18px;
    font-size: 16px;
    border-radius: 12px;
  }
  .nav-links a.active {
    background: rgba(26, 92, 240, 0.08);
  }
  .nav-toggle {
    display: block;
    z-index: 1001;
  }
  .page-hero { padding-top: calc(var(--nav-h) + 50px); padding-bottom: 64px; }
  .hero-title { font-size: 30px; }
  .hero-subtitle { font-size: 15px; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; }
  .hero-meta { flex-direction: column; gap: 14px; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 40px; }
  .footer-brand { grid-column: 1 / -1; }
  .cta-band { flex-direction: column; text-align: center; padding: 40px 28px; }
  .cta-actions { width: 100%; }
  .cta-actions .btn { flex: 1; }
}

@media (max-width: 520px) {
  :root { --section-space: 56px; }
  .container { padding: 0 18px; }
  .process-grid, .device-grid, .stats-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 26px; }
  .section-title { font-size: 24px; }
  .section-title-wrap { margin-bottom: 36px; }
  .breadcrumb { font-size: 12px; flex-wrap: wrap; }
  .hero-meta-item { font-size: 13px; }
  .footer-top { grid-template-columns: 1fr; gap: 30px; }
  .footer-col a { padding: 6px 0; }
  .stat-num { font-size: 36px; }
  .trouble-item { flex-direction: column; gap: 12px; }
  .cta-text h3 { font-size: 22px; }
  .faq-wrap .accordion-title { padding: 16px 18px; font-size: 15px; }
}

/* roulang page: article */
/* ============ 设计变量 ============ */
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #3b82f6;
  --accent: #06b6d4;
  --accent-light: #22d3ee;
  --gold: #f59e0b;
  --bg-light: #f8fafc;
  --bg-muted: #f1f5f9;
  --bg-deep: #0a1628;
  --text-main: #1e293b;
  --text-secondary: #55657e;
  --text-muted: #8b9cb4;
  --border-base: #e2e8f0;
  --border-light: #eef2f7;
  --white: #ffffff;
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  --shadow-xs: 0 1px 3px rgba(15,23,42,0.04);
  --shadow-sm: 0 2px 10px rgba(15,23,42,0.06);
  --shadow-md: 0 8px 28px rgba(15,23,42,0.08);
  --shadow-lg: 0 20px 50px rgba(15,23,42,0.14);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --duration: 0.35s;
  --header-h: 72px;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-main);
  background: var(--bg-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

ul, ol {
  list-style: none;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all var(--duration) var(--ease);
}

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  outline: none;
}

button {
  cursor: pointer;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.35);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ============ 容器与工具类 ============ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
}

.section-title {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 620px;
  line-height: 1.75;
}

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

.section-header .section-subtitle {
  margin: 0 auto;
}

.divider {
  width: 48px;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  margin: 16px auto 0;
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  transition: all var(--duration) var(--ease);
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 4px 18px rgba(37, 99, 235, 0.28);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(37, 99, 235, 0.36);
  color: var(--white);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.24);
}

.btn-outline {
  border-color: rgba(255, 255, 255, 0.5);
  color: var(--white);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--white);
  color: var(--white);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--primary-light));
  color: var(--white);
  box-shadow: 0 4px 18px rgba(6, 182, 212, 0.28);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(6, 182, 212, 0.38);
  color: var(--white);
}

/* ============ 徽章 / 标签 ============ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary);
  border: 1px solid rgba(37, 99, 235, 0.18);
}

.badge-light {
  background: rgba(255, 255, 255, 0.16);
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.badge-accent {
  background: rgba(6, 182, 212, 0.1);
  color: #0e7490;
  border-color: rgba(6, 182, 212, 0.2);
}

.tag-chip {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 100px;
  background: var(--bg-muted);
  border: 1px solid var(--border-base);
  font-size: 13px;
  color: var(--text-secondary);
  transition: all var(--duration) var(--ease);
}

.tag-chip:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}

/* ============ 页头 / 导航 ============ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-h);
  z-index: 1000;
  background: rgba(8, 16, 30, 0.66);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: all var(--duration) var(--ease);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--border-base);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.08);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-size: 24px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.01em;
  line-height: 1.2;
  display: inline-flex;
  align-items: baseline;
  transition: all var(--duration) var(--ease);
}

.logo span {
  font-size: 17px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.72);
  margin-left: 2px;
  letter-spacing: 0.04em;
}

.site-header.scrolled .logo {
  color: var(--primary);
}

.site-header.scrolled .logo span {
  color: var(--accent);
}

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

.nav-links a {
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.01em;
  transition: all var(--duration) var(--ease);
}

.nav-links a:hover {
  background: rgba(255, 255, 255, 0.14);
  color: var(--white);
  transform: translateY(-1px);
}

.site-header.scrolled .nav-links a {
  color: var(--text-main);
}

.site-header.scrolled .nav-links a:hover {
  background: var(--bg-muted);
  color: var(--primary);
}

.nav-links a.active {
  background: rgba(37, 99, 235, 0.3);
  color: var(--white);
  font-weight: 600;
}

.site-header.scrolled .nav-links a.active {
  background: rgba(37, 99, 235, 0.12);
  color: var(--primary);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.08);
  position: relative;
  transition: all var(--duration) var(--ease);
}

.site-header.scrolled .nav-toggle {
  border-color: var(--border-base);
  background: var(--bg-muted);
}

.nav-icon,
.nav-icon::before,
.nav-icon::after {
  content: '';
  position: absolute;
  left: 11px;
  width: 20px;
  height: 2px;
  background: var(--white);
  border-radius: 4px;
  transition: all var(--duration) var(--ease);
}

.site-header.scrolled .nav-icon,
.site-header.scrolled .nav-icon::before,
.site-header.scrolled .nav-icon::after {
  background: var(--text-main);
}

.nav-icon {
  top: 21px;
}

.nav-icon::before {
  top: -6px;
}

.nav-icon::after {
  top: 6px;
}

.nav-toggle.active .nav-icon {
  background: transparent;
}

.nav-toggle.active .nav-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle.active .nav-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ============ 文章页横幅 ============ */
.article-banner {
  min-height: 360px;
  background: linear-gradient(135deg, rgba(8, 16, 30, 0.92) 0%, rgba(29, 58, 104, 0.82) 55%, rgba(37, 99, 235, 0.7) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  display: flex;
  align-items: flex-end;
  padding: calc(var(--header-h) + 48px) 0 56px;
  position: relative;
  overflow: hidden;
}

.article-banner::after {
  content: '';
  position: absolute;
  right: -120px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.25), transparent 70%);
  pointer-events: none;
}

.article-banner .container {
  width: 100%;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.75);
}

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

.breadcrumb .sep {
  color: rgba(255, 255, 255, 0.4);
}

.breadcrumb .current {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
}

.article-banner h1 {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--white);
  max-width: 820px;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.article-banner .banner-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 20px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
}

.article-banner .banner-meta i {
  margin-right: 6px;
  opacity: 0.7;
}

/* ============ 文章主体布局 ============ */
.article-layout {
  padding: 64px 0 80px;
}

.article-main-wrap {
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  padding: 44px;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  padding-bottom: 24px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border-light);
}

.article-meta .meta-item {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  color: var(--text-secondary);
}

.article-meta .meta-item i {
  margin-right: 6px;
  color: var(--text-muted);
}

/* ============ 文章正文排版 ============ */
.article-content {
  font-size: 16px;
  line-height: 1.95;
  color: var(--text-main);
}

.article-content p {
  margin-bottom: 1.6em;
  text-align: justify;
}

.article-content h2 {
  font-size: 26px;
  font-weight: 700;
  line-height: 1.4;
  margin: 2em 0 0.8em;
  padding-left: 16px;
  border-left: 4px solid var(--primary);
  border-radius: 0 8px 8px 0;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.article-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 1.8em 0 0.6em;
  color: var(--text-main);
}

.article-content h4 {
  font-size: 17px;
  font-weight: 600;
  margin: 1.4em 0 0.5em;
  color: var(--text-main);
}

.article-content ul {
  margin: 0 0 1.6em;
  padding: 0;
  list-style: none;
}

.article-content ul li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 10px;
}

.article-content ul li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 13px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.article-content ol {
  margin: 0 0 1.6em;
  padding-left: 24px;
}

.article-content ol li {
  margin-bottom: 10px;
}

.article-content a {
  color: var(--primary);
  font-weight: 500;
  border-bottom: 1px solid rgba(37, 99, 235, 0.3);
  padding-bottom: 1px;
}

.article-content a:hover {
  color: var(--primary-dark);
  border-bottom-color: var(--primary-dark);
}

.article-content img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  margin: 1.8em auto;
}

.article-content blockquote {
  border-left: 4px solid var(--accent);
  background: rgba(6, 182, 212, 0.06);
  border-radius: 0 12px 12px 0;
  padding: 20px 24px;
  margin: 1.8em 0;
  font-style: italic;
  color: var(--text-secondary);
}

.article-content blockquote p {
  margin-bottom: 0;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.8em 0;
  font-size: 15px;
}

.article-content table th {
  background: var(--bg-muted);
  padding: 12px 16px;
  font-weight: 600;
  text-align: left;
  border-bottom: 2px solid var(--border-base);
}

.article-content table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
}

.article-content table tr:hover td {
  background: rgba(37, 99, 235, 0.03);
}

.article-content code {
  background: var(--bg-muted);
  border: 1px solid var(--border-base);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 14px;
  font-family: "SFMono-Regular", Consolas, Menlo, monospace;
}

.article-content pre {
  background: var(--bg-deep);
  color: #e2e8f0;
  padding: 24px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 1.8em 0;
  line-height: 1.6;
  font-size: 14px;
}

.article-content pre code {
  background: transparent;
  border: none;
  color: inherit;
  padding: 0;
}

/* ============ 文章底部标签 ============ */
.article-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 28px;
  margin-top: 36px;
  border-top: 1px solid var(--border-light);
}

.article-tags .tag-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-right: 4px;
}

/* ============ 侧边栏组件 ============ */
.sidebar-wrap {
  padding-left: 8px;
}

.sidebar-widget {
  background: var(--white);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xs);
  padding: 28px;
  margin-bottom: 24px;
  transition: all var(--duration) var(--ease);
}

.sidebar-widget:hover {
  box-shadow: var(--shadow-sm);
}

.widget-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 14px;
}

.widget-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 3px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.widget-title i {
  color: var(--primary);
  font-size: 17px;
}

.guide-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.guide-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  transition: all var(--duration) var(--ease);
}

.guide-item:hover {
  background: rgba(37, 99, 235, 0.06);
  border-color: rgba(37, 99, 235, 0.2);
  transform: translateX(4px);
}

.guide-item .guide-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 16px;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.guide-item .guide-info {
  flex: 1;
  min-width: 0;
}

.guide-item .guide-info strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 2px;
}

.guide-item .guide-info span {
  font-size: 13px;
  color: var(--text-muted);
}

.guide-item .guide-arrow {
  color: var(--text-muted);
  font-size: 13px;
  transition: all var(--duration) var(--ease);
}

.guide-item:hover .guide-arrow {
  color: var(--primary);
  transform: translateX(3px);
}

.read-list {
  display: flex;
  flex-direction: column;
}

.read-list a {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 0;
  font-size: 14px;
  color: var(--text-secondary);
  border-bottom: 1px dashed var(--border-light);
  line-height: 1.6;
  transition: all var(--duration) var(--ease);
}

.read-list a:last-child {
  border-bottom: none;
}

.read-list a::before {
  content: '\f126';
  font-family: 'Font Awesome 6 Free';
  font-weight: 600;
  font-size: 12px;
  color: var(--accent);
  margin-top: 4px;
  flex-shrink: 0;
}

.read-list a:hover {
  color: var(--primary);
  padding-left: 6px;
}

.safety-tip {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.06), rgba(6, 182, 212, 0.06));
  border: 1px solid rgba(37, 99, 235, 0.14);
  border-radius: 12px;
  padding: 20px;
  margin-top: 8px;
}

.safety-tip h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.safety-tip h4 i {
  color: var(--primary);
}

.safety-tip p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 10px;
}

.safety-tip a {
  font-size: 13px;
  color: var(--primary);
  font-weight: 500;
}

.safety-tip a:hover {
  text-decoration: underline;
}

/* ============ 内容未找到 ============ */
.not-found-box {
  text-align: center;
  padding: 60px 30px;
}

.not-found-box .not-found-icon {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--bg-muted), var(--border-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 34px;
  color: var(--text-muted);
  margin: 0 auto 24px;
  border: 1px solid var(--border-base);
  box-shadow: var(--shadow-sm);
}

.not-found-box h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.not-found-box p {
  color: var(--text-secondary);
  margin-bottom: 28px;
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
}

/* ============ 相关推荐区 ============ */
.related-section {
  padding: 72px 0;
  background: var(--bg-muted);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.related-card {
  background: var(--white);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  height: 100%;
  display: flex;
  flex-direction: column;
  transition: all var(--duration) var(--ease);
  box-shadow: var(--shadow-xs);
}

.related-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(37, 99, 235, 0.18);
}

.related-card .card-media {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.related-card .card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}

.related-card:hover .card-media img {
  transform: scale(1.06);
}

.related-card .card-media .badge {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
}

.related-card .card-body {
  padding: 22px 22px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.related-card .card-body h3 {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-main);
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: all var(--duration) var(--ease);
}

.related-card:hover .card-body h3 {
  color: var(--primary);
}

.related-card .card-body p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-card .card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
  margin-top: auto;
}

.related-card .card-footer span {
  font-size: 13px;
  color: var(--text-muted);
}

.related-card .card-footer a {
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.related-card .card-footer a:hover {
  gap: 10px;
}

/* ============ FAQ 区 ============ */
.faq-section {
  padding: 72px 0 80px;
  background: var(--bg-light);
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  box-shadow: var(--shadow-xs);
  transition: all var(--duration) var(--ease);
}

.faq-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: rgba(37, 99, 235, 0.16);
}

.faq-item.active {
  border-color: rgba(37, 99, 235, 0.22);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  width: 100%;
  text-align: left;
  transition: all var(--duration) var(--ease);
}

.faq-question:hover {
  color: var(--primary);
}

.faq-question .faq-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--primary);
  transition: all var(--duration) var(--ease);
}

.faq-item.active .faq-icon {
  background: var(--primary);
  color: var(--white);
  transform: rotate(135deg);
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease), padding 0.4s var(--ease);
}

.faq-item.active .faq-answer {
  padding: 0 24px 20px;
  max-height: 400px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ============ CTA 区 ============ */
.cta-section {
  padding: 72px 0;
  background: linear-gradient(135deg, var(--bg-deep) 0%, #13294b 100%);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.35), transparent 65%);
}

.cta-section::after {
  content: '';
  position: absolute;
  bottom: -60px;
  left: -60px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.25), transparent 65%);
}

.cta-box {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.cta-box .badge {
  margin-bottom: 20px;
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  color: var(--white);
}

.cta-box h2 {
  font-size: 32px;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  line-height: 1.35;
}

.cta-box p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.8;
  margin-bottom: 32px;
}

.cta-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* ============ 页脚 ============ */
.site-footer {
  background: var(--bg-deep);
  padding: 56px 0 0;
  color: rgba(255, 255, 255, 0.7);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 44px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand h3 {
  font-size: 24px;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6);
  max-width: 340px;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 24px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  padding: 6px 0;
  transition: all var(--duration) var(--ease);
}

.footer-col a:hover {
  color: var(--white);
  padding-left: 6px;
}

.footer-bottom {
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-bottom p {
  margin: 0;
}

/* ============ 动效 ============ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate {
  opacity: 0;
}

.animate.visible {
  animation: fadeInUp 0.7s var(--ease) forwards;
}

.fade-el {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.fade-el.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============ 响应式断点 ============ */
@media (max-width: 1024px) {
  .container {
    padding: 0 32px;
  }

  .article-banner h1 {
    font-size: 34px;
  }

  .article-main-wrap {
    padding: 32px;
  }

  .sidebar-wrap {
    padding-left: 0;
    margin-top: 32px;
  }

  .sidebar-widget {
    padding: 22px;
  }

  .footer-top {
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }

  .nav-links {
    position: fixed;
    top: calc(var(--header-h) - 6px);
    left: 16px;
    right: 16px;
    flex-direction: column;
    align-items: stretch;
    background: rgba(15, 25, 45, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 10px;
    display: none;
    z-index: 999;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 14px 16px;
    color: var(--white);
    border-radius: 10px;
    justify-content: flex-start;
  }

  .nav-links a.active {
    background: rgba(37, 99, 235, 0.35);
    color: var(--white);
  }

  .site-header.scrolled .nav-links a {
    color: var(--white);
  }

  .nav-toggle {
    display: block;
  }

  .article-banner {
    min-height: 300px;
    padding: calc(var(--header-h) + 32px) 0 40px;
  }

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

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

  .article-layout {
    padding: 40px 0 56px;
  }

  .article-main-wrap {
    padding: 24px 20px;
    border-radius: 16px;
  }

  .article-meta {
    gap: 12px;
  }

  .article-content {
    font-size: 15px;
  }

  .article-content h2 {
    font-size: 22px;
  }

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

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

  .faq-section {
    padding: 48px 0 56px;
  }

  .faq-question {
    font-size: 15px;
    padding: 16px 18px;
  }

  .faq-answer p {
    font-size: 14px;
  }

  .cta-section {
    padding: 56px 0;
  }

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

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

  .footer-brand p {
    max-width: 100%;
  }
}

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

  .logo {
    font-size: 21px;
  }

  .logo span {
    font-size: 15px;
  }

  .article-banner h1 {
    font-size: 22px;
  }

  .article-main-wrap {
    padding: 20px 16px;
  }

  .article-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .article-content h2 {
    font-size: 20px;
    padding-left: 12px;
  }

  .article-content h3 {
    font-size: 18px;
  }

  .badge {
    font-size: 12px;
    padding: 5px 12px;
  }

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

  .section-subtitle {
    font-size: 14px;
  }

  .btn {
    padding: 11px 22px;
    font-size: 14px;
  }

  .related-card .card-body {
    padding: 18px 16px 20px;
  }

  .faq-question {
    font-size: 14px;
  }

  .faq-answer p {
    font-size: 13px;
  }

  .cta-box h2 {
    font-size: 21px;
  }

  .cta-box p {
    font-size: 14px;
  }

  .footer-top {
    gap: 24px;
  }

  .footer-brand h3 {
    font-size: 21px;
  }

  .footer-bottom p {
    font-size: 12px;
    line-height: 1.6;
  }
}

/* roulang page: category2 */
:root{
  --primary:#1a56db;
  --primary-dark:#1e40af;
  --primary-light:#3b82f6;
  --accent:#06b6d4;
  --accent-light:#22d3ee;
  --dark:#0b1220;
  --dark-2:#0f172a;
  --dark-3:#1e293b;
  --light:#f8fafc;
  --light-2:#f1f5f9;
  --text:#0f172a;
  --text-light:#475569;
  --text-muted:#94a3b8;
  --border:#e2e8f0;
  --white:#ffffff;
  --radius-lg:20px;
  --radius-md:14px;
  --radius-sm:10px;
  --shadow-sm:0 2px 8px rgba(15,23,42,.08);
  --shadow-md:0 8px 30px rgba(15,23,42,.10);
  --shadow-lg:0 20px 50px rgba(15,23,42,.16);
  --transition:all .3s ease;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.7;color:var(--text);background:var(--light);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit;transition:var(--transition)}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input,textarea,select{font-family:inherit;outline:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.text-center{text-align:center}
.text-primary{color:var(--primary)}
.text-muted{color:var(--text-muted)}
.section-pad{padding:80px 0}
.bg-light{background:var(--light)}
.bg-white{background:var(--white)}
.bg-dark{background:var(--dark);color:var(--white)}
.grid-x{display:flex;flex-wrap:wrap}
.cell{flex:0 0 auto;padding:0 15px}
.cell-12{flex:0 0 100%;max-width:100%}
.cell-6{flex:0 0 50%;max-width:50%}
.cell-4{flex:0 0 33.333%;max-width:33.333%}
.cell-3{flex:0 0 25%;max-width:25%}
@media screen and (max-width:1024px){
  .cell-4{flex:0 0 50%;max-width:50%}
  .cell-3{flex:0 0 50%;max-width:50%}
}
@media screen and (max-width:768px){
  .section-pad{padding:60px 0}
  .cell-6,.cell-4,.cell-3{flex:0 0 100%;max-width:100%}
}

/* Header */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(15,23,42,.72);
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid rgba(255,255,255,.12);
  box-shadow:0 4px 30px rgba(0,0,0,.15);
  transition:var(--transition);
}
.site-header.scrolled{
  background:rgba(255,255,255,.95);
  box-shadow:0 4px 24px rgba(15,23,42,.12);
  border-bottom-color:var(--border);
}
.nav-wrap{
  display:flex;align-items:center;justify-content:space-between;
  height:72px;
}
.logo{
  font-size:1.5rem;font-weight:800;color:var(--white);
  letter-spacing:.5px;display:flex;align-items:baseline;
  transition:var(--transition);
}
.logo span{
  font-weight:400;font-size:1.1rem;color:var(--accent-light);
  margin-left:4px;
}
.site-header.scrolled .logo{color:var(--text)}
.nav-links{
  display:flex;align-items:center;gap:8px;
}
.nav-links a{
  color:rgba(255,255,255,.85);
  font-size:.95rem;font-weight:500;
  padding:8px 18px;border-radius:8px;
  transition:var(--transition);
  position:relative;
}
.nav-links a:hover{
  color:var(--white);
  background:rgba(255,255,255,.12);
}
.nav-links a.active{
  color:var(--white);
  background:rgba(255,255,255,.18);
  font-weight:600;
}
.site-header.scrolled .nav-links a{
  color:var(--text-light);
}
.site-header.scrolled .nav-links a:hover{
  color:var(--primary);
  background:var(--light-2);
}
.site-header.scrolled .nav-links a.active{
  color:var(--primary);
  background:rgba(26,86,219,.10);
}
.nav-toggle{
  display:none;
  width:44px;height:44px;border-radius:10px;
  background:rgba(255,255,255,.15);
  align-items:center;justify-content:center;
  transition:var(--transition);
}
.site-header.scrolled .nav-toggle{
  background:var(--light-2);
}
.nav-icon,.nav-icon::before,.nav-icon::after{
  display:block;width:22px;height:2px;
  background:var(--white);
  border-radius:2px;transition:var(--transition);
  position:relative;
}
.site-header.scrolled .nav-icon,.site-header.scrolled .nav-icon::before,.site-header.scrolled .nav-icon::after{
  background:var(--text);
}
.nav-icon::before{content:'';position:absolute;top:-7px}
.nav-icon::after{content:'';position:absolute;top:7px}
.nav-toggle.open .nav-icon{
  background:transparent;
}
.nav-toggle.open .nav-icon::before{
  top:0;transform:rotate(45deg);
}
.nav-toggle.open .nav-icon::after{
  top:0;transform:rotate(-45deg);
}
@media screen and (max-width:768px){
  .nav-toggle{display:flex}
  .nav-links{
    display:none;
    position:absolute;top:72px;left:0;right:0;
    flex-direction:column;
    background:rgba(15,23,42,.96);
    backdrop-filter:blur(20px);
    padding:20px;
    gap:4px;
    border-bottom:1px solid rgba(255,255,255,.1);
  }
  .nav-links.open{display:flex}
  .nav-links a{
    color:var(--white) !important;
    display:block;width:100%;padding:12px 16px;
    border-radius:10px;font-size:1rem;
  }
  .nav-links a:hover{
    background:rgba(255,255,255,.1) !important;
    color:var(--white) !important;
  }
  .nav-links a.active{
    background:rgba(26,86,219,.35) !important;
    color:var(--white) !important;
  }
}

/* Page Banner */
.page-banner{
  position:relative;
  padding:160px 0 80px;
  background:var(--dark);
  overflow:hidden;
}
.page-banner::before{
  content:'';
  position:absolute;
  inset:0;
  background:url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  opacity:.35;
}
.page-banner::after{
  content:'';
  position:absolute;
  inset:0;
  background:linear-gradient(135deg,rgba(11,18,32,.92) 20%,rgba(15,23,42,.72) 60%,rgba(6,182,212,.25));
}
.page-banner .container{
  position:relative;
  z-index:2;
}
.page-banner h1{
  font-size:2.8rem;font-weight:800;color:var(--white);
  margin-bottom:18px;line-height:1.25;
  letter-spacing:-.5px;
}
.page-banner h1 span{
  color:var(--accent-light);
}
.page-banner p{
  font-size:1.15rem;color:rgba(255,255,255,.9);
  max-width:760px;margin-bottom:30px;
  line-height:1.8;
}
.breadcrumb{
  display:flex;align-items:center;gap:8px;
  color:rgba(255,255,255,.6);font-size:.9rem;
  margin-bottom:20px;
}
.breadcrumb a:hover{color:var(--accent-light)}
.breadcrumb .sep{color:rgba(255,255,255,.35)}
.breadcrumb .current{color:rgba(255,255,255,.9)}
@media screen and (max-width:768px){
  .page-banner{padding:130px 0 60px}
  .page-banner h1{font-size:2rem}
  .page-banner p{font-size:1rem}
}

/* Hero Feature Cards */
.hero-features{
  display:flex;
  gap:20px;
  margin-top:30px;
  flex-wrap:wrap;
}
.hero-feature{
  background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.18);
  backdrop-filter:blur(10px);
  border-radius:var(--radius-md);
  padding:16px 22px;
  display:flex;align-items:center;gap:12px;
  transition:var(--transition);
}
.hero-feature:hover{
  background:rgba(255,255,255,.2);
  transform:translateY(-2px);
  box-shadow:0 12px 30px rgba(0,0,0,.2);
}
.hero-feature i{
  font-size:1.4rem;color:var(--accent-light);
}
.hero-feature span{
  color:var(--white);font-weight:600;font-size:.95rem;
}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:14px 32px;
  border-radius:12px;
  font-size:1rem;font-weight:600;
  letter-spacing:.3px;
  transition:var(--transition);
  border:2px solid transparent;
  gap:8px;
  cursor:pointer;
  line-height:1;
}
.btn i{
  font-size:.95rem;
}
.btn-primary{
  background:var(--primary);
  color:var(--white);
  box-shadow:0 6px 20px rgba(26,86,219,.30);
}
.btn-primary:hover{
  background:var(--primary-dark);
  transform:translateY(-3px);
  box-shadow:0 12px 32px rgba(26,86,219,.40);
}
.btn-light{
  background:rgba(255,255,255,.15);
  color:var(--white);
  border-color:rgba(255,255,255,.35);
  backdrop-filter:blur(8px);
}
.btn-light:hover{
  background:rgba(255,255,255,.25);
  transform:translateY(-3px);
}
.btn-outline{
  border-color:var(--primary);
  color:var(--primary);
  background:transparent;
}
.btn-outline:hover{
  background:var(--primary);
  color:var(--white);
  transform:translateY(-3px);
  box-shadow:0 10px 26px rgba(26,86,219,.30);
}
.btn-block{width:100%}

/* Section Titles */
.section-header{
  margin-bottom:50px;
}
.section-tag{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(26,86,219,.08);
  color:var(--primary);
  font-size:.85rem;font-weight:600;
  padding:8px 20px;border-radius:30px;
  letter-spacing:.5px;
  margin-bottom:16px;
  border:1px solid rgba(26,86,219,.12);
}
.section-tag i{font-size:.8rem}
.section-title{
  font-size:2.2rem;font-weight:800;
  line-height:1.3;letter-spacing:-.5px;
  color:var(--text);
  margin-bottom:16px;
}
.section-title span{
  color:var(--primary);
  position:relative;
}
.section-subtitle{
  font-size:1.05rem;color:var(--text-light);
  max-width:680px;margin:0 auto;
  line-height:1.8;
}
@media screen and (max-width:768px){
  .section-title{font-size:1.7rem}
}

/* Cards */
.card{
  background:var(--white);
  border-radius:var(--radius-lg);
  padding:32px 28px;
  border:1px solid var(--border);
  box-shadow:var(--shadow-sm);
  transition:var(--transition);
  height:100%;
}
.card:hover{
  transform:translateY(-8px);
  box-shadow:var(--shadow-lg);
  border-color:transparent;
}
.card-icon{
  width:64px;height:64px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  border-radius:18px;
  display:flex;align-items:center;justify-content:center;
  margin-bottom:22px;
  box-shadow:0 10px 24px rgba(26,86,219,.30);
}
.card-icon i{
  font-size:1.6rem;color:var(--white);
}
.card h3{
  font-size:1.25rem;font-weight:700;
  margin-bottom:12px;color:var(--text);
}
.card p{
  color:var(--text-light);font-size:.95rem;
  line-height:1.7;
  margin-bottom:0;
}

/* Cover Cards */
.cover-card{
  background:var(--white);border-radius:var(--radius-lg);
  overflow:hidden;box-shadow:var(--shadow-sm);
  border:1px solid var(--border);
  transition:var(--transition);
  height:100%;
}
.cover-card:hover{
  transform:translateY(-8px);
  box-shadow:var(--shadow-lg);
}
.cover-img-wrap{
  height:220px;overflow:hidden;position:relative;
}
.cover-img-wrap img{
  width:100%;height:100%;object-fit:cover;
  transition:transform .5s ease;
}
.cover-card:hover .cover-img-wrap img{
  transform:scale(1.06);
}
.cover-info{
  padding:26px 24px;
}
.cover-info .tag{
  display:inline-block;
  background:rgba(6,182,212,.1);
  color:#0e7490;
  font-size:.8rem;font-weight:600;
  padding:5px 12px;border-radius:20px;
  margin-bottom:12px;
}
.cover-info h3{
  font-size:1.2rem;font-weight:700;margin-bottom:10px;
  line-height:1.4;color:var(--text);
}
.cover-info p{
  font-size:.9rem;color:var(--text-light);
  margin-bottom:16px;line-height:1.65;
}
.cover-link{
  display:inline-flex;align-items:center;gap:6px;
  color:var(--primary);font-weight:600;font-size:.9rem;
}
.cover-link i{
  transition:transform .3s ease;
}
.cover-link:hover i{
  transform:translateX(4px);
}

/* Stats */
.stats-section{
  background:linear-gradient(135deg,var(--dark-2),var(--dark-3));
  position:relative;overflow:hidden;
  padding:70px 0;
}
.stats-section::before{
  content:'';
  position:absolute;inset:0;
  background:url('/assets/images/backpic/back-3.png') center/cover no-repeat;
  opacity:.12;
}
.stat-box{
  text-align:center;
  padding:20px;
  position:relative;
  z-index:1;
}
.stat-box .num{
  font-size:2.8rem;font-weight:800;
  color:var(--accent-light);
  line-height:1.2;
  margin-bottom:6px;
}
.stat-box .label{
  color:rgba(255,255,255,.75);
  font-size:.95rem;
}

/* Flow steps */
.flow-container{
  position:relative;
  display:flex;
  gap:30px;
  justify-content:center;
  flex-wrap:wrap;
}
.flow-step{
  flex:1;
  min-width:240px;
  max-width:280px;
  text-align:center;
  padding:40px 24px 30px;
  background:var(--white);
  border-radius:var(--radius-lg);
  border:1px solid var(--border);
  box-shadow:var(--shadow-sm);
  transition:var(--transition);
  position:relative;
}
.flow-step:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-md);
}
.step-number{
  position:absolute;
  top:-18px;left:50%;
  transform:translateX(-50%);
  width:40px;height:40px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  color:var(--white);
  border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:1rem;
  box-shadow:0 8px 20px rgba(26,86,219,.3);
}
.step-icon{
  font-size:2.2rem;
  color:var(--primary);
  margin-bottom:16px;
  display:inline-block;
}
.flow-step h4{
  font-size:1.1rem;font-weight:700;
  margin-bottom:10px;color:var(--text);
}
.flow-step p{
  font-size:.9rem;color:var(--text-light);
  line-height:1.65;
}

/* Checklist items */
.check-list{
  list-style:none;
  margin:0;
}
.check-list li{
  padding:14px 0 14px 40px;
  position:relative;
  border-bottom:1px solid var(--border);
  color:var(--text-light);
  font-size:1rem;
  line-height:1.7;
}
.check-list li:last-child{border-bottom:none}
.check-list li::before{
  content:'';
  position:absolute;left:0;top:20px;
  transform:translateY(-50%);
  width:26px;height:26px;
  border-radius:50%;
  background:rgba(26,86,219,.12);
}
.check-list li::after{
  content:'\f00c';
  font-family:'Font Awesome 6 Free';
  font-weight:900;
  position:absolute;left:0;top:19px;
  transform:translateY(-50%);
  width:26px;text-align:center;
  font-size:.75rem;
  color:var(--primary);
}

/* FAQ */
.faq-wrap{
  max-width:860px;
  margin:0 auto;
}
.faq-item{
  background:var(--white);
  border-radius:var(--radius-md);
  margin-bottom:16px;
  box-shadow:var(--shadow-sm);
  border:1px solid var(--border);
  overflow:hidden;
  transition:var(--transition);
}
.faq-item:hover{
  box-shadow:var(--shadow-md);
  border-color:rgba(26,86,219,.25);
}
.faq-item.open{
  border-color:var(--primary);
  box-shadow:0 8px 32px rgba(26,86,219,.14);
}
.faq-question{
  padding:20px 24px;
  font-size:1.05rem;font-weight:600;
  color:var(--text);
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;cursor:pointer;
  transition:var(--transition);
}
.faq-question i{
  font-size:.9rem;
  color:var(--primary);
  transition:transform .3s ease;
  flex-shrink:0;
  opacity:.7;
  width:20px;text-align:center;
}
.faq-item.open .faq-question i{
  transform:rotate(180deg);
  opacity:1;
}
.faq-answer{
  max-height:0;
  overflow:hidden;
  transition:max-height .4s ease;
}
.faq-answer p{
  padding:0 24px 22px;
  color:var(--text-light);
  font-size:1rem;
  line-height:1.8;
  margin:0;
}
.faq-item.open .faq-answer{
  max-height:400px;
}

/* CTA */
.cta-banner{
  position:relative;
  padding:80px 0;
  background:var(--dark);
  overflow:hidden;
  text-align:center;
}
.cta-banner::before{
  content:'';
  position:absolute;inset:0;
  background:url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  opacity:.2;
}
.cta-banner::after{
  content:'';
  position:absolute;inset:0;
  background:linear-gradient(135deg,rgba(11,18,32,.85),rgba(26,86,219,.70));
}
.cta-banner .container{
  position:relative;z-index:2;
}
.cta-banner h2{
  color:var(--white);font-size:2.4rem;
  font-weight:800;margin-bottom:20px;
  letter-spacing:-.5px;
}
.cta-banner p{
  color:rgba(255,255,255,.9);
  font-size:1.15rem;max-width:600px;
  margin:0 auto 36px;
  line-height:1.8;
}
@media screen and (max-width:768px){
  .cta-banner h2{font-size:1.8rem}
  .cta-banner p{font-size:1rem}
}

/* Content cards row */
.content-cards{
  display:flex;
  gap:30px;
  flex-wrap:wrap;
}
.content-card{
  flex:1 1 calc(33.333% - 20px);
  background:var(--white);
  border-radius:var(--radius-lg);
  overflow:hidden;
  border:1px solid var(--border);
  box-shadow:var(--shadow-sm);
  transition:var(--transition);
}
.content-card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-md);
}
@media screen and (max-width:1024px){
  .content-card{flex:1 1 calc(50% - 15px)}
}
@media screen and (max-width:768px){
  .content-card{flex:1 1 100%}
}
.content-card .card-body{
  padding:24px;
}
.card-meta{
  display:flex;align-items:center;gap:16px;
  margin-bottom:14px;
  font-size:.85rem;color:var(--text-muted);
}
.card-meta span{
  display:flex;align-items:center;gap:6px;
}
.card-meta i{
  font-size:.8rem;
  color:var(--accent);
}
.content-card h3{
  font-size:1.2rem;font-weight:700;
  color:var(--text);margin-bottom:10px;
  line-height:1.4;
}
.content-card h3 a:hover{
  color:var(--primary);
}
.content-card .card-body p{
  color:var(--text-light);font-size:.9rem;
  line-height:1.7;margin-bottom:18px;
}
.safety-meter{
  margin-top:18px;
  padding-top:18px;
  border-top:1px dashed var(--border);
  display:flex;align-items:center;gap:10px;
  font-size:.85rem;color:var(--text-muted);
}
.meter-bar{
  flex:1;height:8px;border-radius:20px;
  background:var(--light-2);
  overflow:hidden;
}
.meter-fill{
  height:100%;border-radius:20px;
  background:linear-gradient(90deg,var(--primary),var(--accent));
  width:90%;
}
.rating-text{font-weight:700;color:var(--text)}

/* Info split sections */
.info-split{
  display:flex;flex-wrap:wrap;
  align-items:center;gap:50px;
}
.info-split.reverse{
  flex-direction:row-reverse;
}
.info-visual{
  flex:1 1 46%;
}
.info-text{
  flex:1 1 46%;
}
.info-visual img{
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-lg);
  width:100%;
  height:400px;
  object-fit:cover;
}
.info-text h3{
  font-size:1.8rem;font-weight:800;
  line-height:1.4;margin:18px 0;
  color:var(--text);
}
.info-text .section-tag{
  margin-bottom:8px;
}
.info-text p{
  color:var(--text-light);
  font-size:1rem;
  margin-bottom:16px;
  line-height:1.8;
}
.info-list{
  margin-top:24px;
  list-style:none;
}
.info-list li{
  display:flex;gap:12px;
  padding:10px 0;
  color:var(--text-light);
  font-size:.95rem;
  align-items:flex-start;
}
.info-list li i{
  color:var(--primary);
  margin-top:5px;
  font-size:.9rem;
}

/* Feature callout list */
.callout-grid{
  display:flex;
  flex-wrap:wrap;
  gap:20px;
  margin-top:30px;
}
.callout-item{
  flex:1 1 calc(50% - 20px);
  display:flex;
  gap:16px;
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.1);
  border-radius:var(--radius-md);
  padding:22px;
  transition:var(--transition);
}
.callout-item:hover{
  background:rgba(255,255,255,.1);
  border-color:rgba(6,182,212,.4);
  transform:translateY(-3px);
}
.callout-icon{
  width:50px;height:50px;flex-shrink:0;
  border-radius:14px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 20px rgba(26,86,219,.3);
}
.callout-icon i{
  font-size:1.2rem;color:var(--white);
}
.callout-item h4{
  color:var(--white);font-size:1.05rem;
  font-weight:700;margin-bottom:6px;
}
.callout-item p{
  color:rgba(255,255,255,.7);
  font-size:.88rem;line-height:1.65;
}
@media screen and (max-width:768px){
  .callout-item{flex:1 1 100%}
}

/* Footer */
.site-footer{
  background:var(--dark);
  padding:70px 0 30px;
  position:relative;
  overflow:hidden;
}
.site-footer::before{
  content:'';
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,transparent,rgba(6,182,212,.04));
}
.site-footer .container{
  position:relative;z-index:1;
}
.footer-top{
  display:grid;
  grid-template-columns:2fr 1fr 1fr;
  gap:50px;
  margin-bottom:50px;
}
.footer-brand h3{
  color:var(--white);
  font-size:1.6rem;font-weight:800;
  margin-bottom:14px;
  letter-spacing:-.3px;
}
.footer-brand p{
  color:rgba(255,255,255,.6);
  font-size:.95rem;line-height:1.8;
  max-width:380px;
}
.footer-col h4{
  color:var(--white);
  font-size:1rem;font-weight:600;
  margin-bottom:20px;
  letter-spacing:.5px;
}
.footer-col a{
  display:block;
  color:rgba(255,255,255,.55);
  font-size:.9rem;
  padding:7px 0;
  transition:var(--transition);
}
.footer-col a:hover{
  color:var(--accent-light);
  transform:translateX(5px);
}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);
  padding-top:24px;
  text-align:center;
}
.footer-bottom p{
  color:rgba(255,255,255,.45);
  font-size:.85rem;
}
@media screen and (max-width:768px){
  .footer-top{
    grid-template-columns:1fr;
    gap:30px;
  }
}

/* Back to top */
.back-top{
  position:fixed;
  right:28px;bottom:32px;
  width:48px;height:48px;
  border-radius:14px;
  background:var(--primary);
  color:var(--white);
  display:flex;align-items:center;justify-content:center;
  font-size:1.1rem;
  box-shadow:0 10px 30px rgba(26,86,219,.35);
  opacity:0;visibility:hidden;
  transform:translateY(16px);
  transition:var(--transition);
  z-index:99;
}
.back-top.show{
  opacity:1;visibility:visible;
  transform:translateY(0);
}
.back-top:hover{
  background:var(--primary-dark);
  transform:translateY(-4px);
}