/* roulang page: index */
:root {
  --bg-body: #F6F9FC;
  --bg-white: #FFFFFF;
  --bg-soft: #EEF5FC;
  --primary: #1E6FFF;
  --primary-deep: #0E46D1;
  --primary-light: #EAF2FF;
  --accent: #FF6B2C;
  --accent-deep: #E85A1F;
  --success: #00B578;
  --text-1: #16263D;
  --text-2: #5A7189;
  --text-3: #8CA0B4;
  --border: #E3ECF5;
  --shadow-card: 0 4px 16px rgba(20,50,100,0.05), 0 1px 2px rgba(20,50,100,0.04);
  --shadow-hover: 0 12px 32px rgba(20,80,180,0.10), 0 2px 6px rgba(20,80,180,0.04);
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --transition: 0.25s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, sans-serif;
  background: var(--bg-body);
  color: var(--text-1);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-deep); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button, input { font-family: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-title { font-size: 28px; line-height: 36px; font-weight: 600; color: var(--text-1); }
.section-sub { font-size: 14px; line-height: 22px; color: var(--text-3); margin-top: 8px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 50px; padding: 0 28px; border-radius: var(--radius-sm);
  font-size: 16px; font-weight: 600; line-height: 1; border: none; cursor: pointer;
  transition: all var(--transition);
}
.btn svg { width: 18px; height: 18px; flex-shrink: 0; }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-deep); color: #fff; transform: translateY(-1px); box-shadow: 0 8px 20px rgba(255,107,44,0.25); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-deep); color: #fff; transform: translateY(-1px); }
.btn-outline { background: transparent; border: 2px solid #CBD8E8; color: #33536F; }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-1px); }
.btn-dark { background: #16263D; color: #fff; }
.btn-dark:hover { background: #0E1B2E; color: #fff; }
.btn-sm { height: 38px; padding: 0 18px; font-size: 14px; border-radius: var(--radius-xs); }
.btn-lg { height: 56px; padding: 0 36px; font-size: 17px; border-radius: 14px; }
.btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* Tags */
.tag {
  display: inline-flex; align-items: center; gap: 4px;
  background: var(--primary-light); color: var(--primary-deep);
  border-radius: var(--radius-pill); padding: 4px 10px;
  font-size: 12px; font-weight: 500; line-height: 1.4;
}
.badge-official {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--bg-white); border: 1px solid var(--border);
  color: var(--text-2); font-size: 13px; padding: 6px 14px;
  border-radius: var(--radius-pill);
}
.badge-official::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--success);
}

/* Header */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.header.scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 4px 16px rgba(20,50,100,0.06);
}
.header-inner {
  display: flex; align-items: center; height: 72px; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-badge { width: 36px; height: 36px; border-radius: 10px; overflow: hidden; flex-shrink: 0; }
.brand-text { line-height: 1.2; }
.brand-text strong { display: block; font-size: 15px; font-weight: 600; color: var(--text-1); letter-spacing: 0.2px; }
.brand-text span { font-size: 11px; color: var(--text-3); }
.nav-panel { display: flex; align-items: center; gap: 4px; flex: 1; }
.nav-link {
  padding: 8px 16px; border-radius: 8px;
  font-size: 15px; font-weight: 500; color: var(--text-2);
  transition: all var(--transition); white-space: nowrap;
}
.nav-link:hover { color: var(--text-1); background: #F4F8FE; }
.nav-link.active { color: var(--primary-deep); background: var(--primary-light); font-weight: 600; }
.header-actions { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.search-box { position: relative; }
.search-box input {
  width: 180px; height: 38px; padding: 0 14px 0 36px;
  border: 1px solid var(--border); border-radius: var(--radius-pill);
  background: var(--bg-body); font-size: 14px; color: var(--text-1);
  outline: none; transition: all 0.3s ease;
}
.search-box input::placeholder { color: var(--text-3); }
.search-box input:focus { width: 240px; border-color: var(--primary); background: var(--bg-white); box-shadow: 0 0 0 3px rgba(30,111,255,0.08); }
.search-box svg {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  width: 16px; height: 16px; color: var(--text-3); pointer-events: none;
}
.btn-text { background: none; border: none; color: var(--text-2); font-size: 14px; font-weight: 500; padding: 8px 8px; cursor: pointer; transition: color var(--transition); }
.btn-text:hover { color: var(--primary); }
.nav-toggle { display: none; background: none; border: none; width: 40px; height: 40px; border-radius: 8px; cursor: pointer; flex-direction: column; align-items: center; justify-content: center; gap: 5px; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--text-1); border-radius: 2px; }
.nav-toggle:hover span { background: var(--primary); }

/* Hero */
.hero {
  background: var(--bg-body) url('/assets/images/backpic/back-1.png') no-repeat right top / auto 100%;
  position: relative;
  overflow: hidden;
  padding: 56px 0 72px;
}
.hero::before {
  content: ""; position: absolute; right: 8%; top: 15%; width: 120px; height: 120px;
  border: 2px dashed rgba(30,111,255,0.15); border-radius: 50%;
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; right: 16%; bottom: 12%; width: 60px; height: 60px;
  border: 2px dashed rgba(30,111,255,0.12); border-radius: 50%;
  pointer-events: none;
}
.hero-inner {
  display: flex; align-items: center; gap: 56px;
  position: relative; z-index: 2;
}
.hero-left { flex: 0 0 55%; max-width: 55%; }
.hero-right { flex: 0 0 45%; max-width: 45%; }
.hero h1 {
  font-size: 36px; line-height: 44px; font-weight: 600;
  color: var(--text-1); letter-spacing: 0.3px;
}
.hero-sub {
  font-size: 16px; line-height: 26px; color: var(--text-2);
  margin-top: 14px; max-width: 420px;
}
.hero-btns { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.hero-btns .btn svg { width: 18px; height: 18px; }
.hero-meta {
  display: flex; flex-wrap: wrap; gap: 8px 20px;
  margin-top: 18px; font-size: 13px; color: var(--text-3);
}
.hero-meta span { display: inline-flex; align-items: center; gap: 5px; }
.hero-meta span::before { content: ""; width: 4px; height: 4px; border-radius: 50%; background: var(--primary); }
.hero-trust {
  display: flex; align-items: center; gap: 20px;
  margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.trust-score { display: flex; align-items: center; gap: 8px; }
.trust-score .stars { display: inline-flex; gap: 2px; }
.trust-score .stars svg { width: 14px; height: 14px; color: var(--accent); fill: var(--accent); }
.trust-score strong { font-size: 20px; font-weight: 600; color: var(--text-1); }
.trust-score span { font-size: 13px; color: var(--text-3); }
.trust-tags { display: flex; gap: 8px; }
.trust-tags span {
  font-size: 13px; color: var(--text-2); background: var(--bg-white);
  border: 1px solid var(--border); border-radius: var(--radius-pill);
  padding: 5px 12px;
}
.hero-device {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  border: 6px solid #fff;
  box-shadow: var(--shadow-hover);
  background: var(--primary-light);
  aspect-ratio: 4 / 3;
}
.hero-device img { width: 100%; height: 100%; object-fit: cover; }
.float-badge {
  position: absolute; background: rgba(255,255,255,0.95);
  border-radius: 10px; padding: 8px 14px;
  font-size: 13px; font-weight: 600; color: var(--text-1);
  box-shadow: var(--shadow-card); display: flex; align-items: center; gap: 6px;
  backdrop-filter: blur(8px);
}
.float-badge svg { width: 16px; height: 16px; }
.badge-1 { top: 24px; left: -18px; }
.badge-2 { bottom: 24px; right: -14px; }
.float-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); }

/* Features */
.features { background: var(--bg-white); }
.features-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 40px; }
.features-head .section-en { font-size: 12px; text-transform: uppercase; letter-spacing: 2px; color: var(--text-3); margin-top: 4px; display: block; }
.more-link { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 500; color: var(--text-2); transition: all var(--transition); }
.more-link:hover { color: var(--primary); transform: translateX(2px); }
.more-link svg { width: 16px; height: 16px; }
.features-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.feature-card {
  background: var(--bg-white); border-radius: var(--radius-md);
  padding: 24px; box-shadow: var(--shadow-card);
  border: 1px solid transparent; position: relative; overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.feature-card::before {
  content: ""; position: absolute; top: 0; right: 0; left: 0;
  height: 3px; background: var(--primary);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.35s ease;
}
.feature-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); border-color: var(--primary-light); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: var(--primary-light); display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.feature-icon svg { width: 24px; height: 24px; color: var(--primary); }
.feature-card h3 { font-size: 18px; font-weight: 600; color: var(--text-1); margin-bottom: 8px; }
.feature-card p { font-size: 14px; line-height: 24px; color: var(--text-2); }

/* Screenshots */
.screenshots { background: var(--bg-soft); overflow: hidden; }
.screenshots-head { margin-bottom: 32px; }
.slider-wrap { position: relative; }
.carousel-track {
  display: flex; gap: 24px; overflow-x: auto; scroll-snap-type: x mandatory;
  scrollbar-width: none; -ms-overflow-style: none; padding: 8px 0;
}
.carousel-track::-webkit-scrollbar { display: none; }
.slide-card {
  flex: 0 0 calc(33.333% - 16px); min-width: 0;
  scroll-snap-align: center; position: relative;
  background: var(--bg-white); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card); padding: 16px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.slide-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.phone-frame {
  aspect-ratio: 9 / 16; background: var(--primary-light);
  border-radius: 16px; overflow: hidden; margin-bottom: 14px;
  position: relative;
}
.phone-frame img { width: 100%; height: 100%; object-fit: cover; }
.slide-card p { font-size: 14px; color: var(--text-2); text-align: center; }
.carousel-arrow {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--bg-white); border: 1px solid var(--border);
  color: var(--primary); display: flex; align-items: center; justify-content: center;
  cursor: pointer; z-index: 5; transition: all var(--transition);
  box-shadow: var(--shadow-card);
}
.carousel-arrow:hover { background: var(--primary); color: #fff; border-color: var(--primary); width: 44px; height: 44px; }
.carousel-arrow svg { width: 18px; height: 18px; }
.carousel-arrow.prev { left: -12px; }
.carousel-arrow.next { right: -12px; }
.carousel-dots { display: flex; justify-content: center; gap: 8px; margin-top: 24px; }
.carousel-dots button {
  width: 8px; height: 8px; border-radius: 50%; border: none;
  background: #CBD8E8; cursor: pointer; padding: 0; transition: all var(--transition);
}
.carousel-dots button.active { width: 24px; border-radius: 4px; background: var(--primary); }

/* Requirements */
.requirements { background: var(--bg-white); }
.req-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 40px; }
.req-card {
  background: var(--bg-white); border-radius: var(--radius-md);
  box-shadow: var(--shadow-card); padding: 28px;
  border-top: 3px solid var(--primary);
  transition: box-shadow var(--transition), transform var(--transition);
  position: relative;
}
.req-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.req-card-head { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; }
.req-card-head .sys-icon { width: 40px; height: 40px; border-radius: 10px; background: var(--primary-light); display: flex; align-items: center; justify-content: center; }
.req-card-head .sys-icon svg { width: 20px; height: 20px; color: var(--primary); }
.req-card-head h3 { font-size: 18px; font-weight: 600; color: var(--text-1); }
.req-card-head .btn { margin-left: auto; }
.req-list li { display: flex; align-items: center; gap: 10px; padding: 8px 0; font-size: 14px; color: var(--text-2); }
.req-list li::before {
  content: ""; width: 16px; height: 16px; flex-shrink: 0;
  background: var(--success); border-radius: 50%;
  position: relative;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M4 8L7 11L12 5'/%3E%3C/svg%3E");
  background-size: 10px; background-position: center; background-repeat: no-repeat;
}
.req-card .btn { height: 34px; padding: 0 14px; font-size: 13px; border-radius: 8px; white-space: nowrap; }
.req-more { text-align: center; margin-top: 32px; }
.req-more a { font-size: 14px; color: var(--text-2); display: inline-flex; align-items: center; gap: 6px; transition: color var(--transition); }
.req-more a:hover { color: var(--primary); }
.req-more a svg { width: 14px; height: 14px; }

/* News */
.news-section { background: var(--bg-body); }
.news-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 32px; }
.news-lists { display: flex; flex-direction: column; gap: 16px; }
.news-item {
  display: flex; gap: 20px; align-items: center;
  background: var(--bg-white); border-radius: var(--radius-md);
  padding: 18px; box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), transform var(--transition), background var(--transition);
  border: 1px solid transparent;
}
.news-item:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); background: #F8FAFD; border-color: var(--primary-light); }
.news-thumb { width: 180px; height: 100px; border-radius: var(--radius-sm); overflow: hidden; flex-shrink: 0; }
.news-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.news-item:hover .news-thumb img { transform: scale(1.02); }
.news-body { flex: 1; min-width: 0; }
.news-body h4 {
  font-size: 17px; font-weight: 600; color: var(--text-1);
  line-height: 1.5; margin-bottom: 6px;
  display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden;
}
.news-body p {
  font-size: 14px; line-height: 22px; color: var(--text-2);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  margin-bottom: 10px;
}
.news-meta-row { display: flex; align-items: center; gap: 14px; font-size: 13px; color: var(--text-3); }
.news-meta-row .tag { font-size: 12px; }
.news-empty {
  background: var(--bg-white); border-radius: var(--radius-md);
  padding: 48px 24px; text-align: center; color: var(--text-3);
  box-shadow: var(--shadow-card);
}
.news-empty svg { width: 48px; height: 48px; color: #CBD8E8; margin: 0 auto 12px; }
.news-empty p { font-size: 15px; }

/* Reviews */
.reviews { background: var(--bg-white); }
.reviews-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 24px; align-items: start; margin-top: 40px; }
.review-summary {
  background: var(--bg-body); border-radius: var(--radius-md);
  padding: 28px; box-shadow: var(--shadow-card);
}
.summary-big { font-size: 48px; font-weight: 600; color: var(--text-1); line-height: 1; }
.summary-stars { display: flex; gap: 2px; margin: 10px 0 6px; }
.summary-stars svg { width: 18px; height: 18px; color: var(--accent); fill: var(--accent); }
.summary-desc { font-size: 13px; color: var(--text-3); margin-bottom: 20px; }
.rating-bars { display: flex; flex-direction: column; gap: 8px; }
.rating-bar-row { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-2); }
.rating-bar-row .bar { flex: 1; height: 8px; background: var(--primary-light); border-radius: 4px; overflow: hidden; }
.rating-bar-row .bar span { display: block; height: 100%; background: var(--primary); border-radius: 4px; width: 0; transition: width 1s ease; }
.rating-bar-row .pct { width: 36px; text-align: right; color: var(--text-3); }
.review-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.review-card {
  background: var(--bg-white); border-radius: var(--radius-sm);
  padding: 20px; box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), transform var(--transition);
}
.review-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.review-user { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.review-avatar {
  width: 48px; height: 48px; border-radius: 50%; background: var(--primary-light);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary); flex-shrink: 0;
}
.review-avatar svg { width: 24px; height: 24px; }
.review-user .u-name { font-size: 15px; font-weight: 600; color: var(--text-1); }
.review-user .u-stars { display: flex; gap: 1px; margin-top: 2px; }
.review-user .u-stars svg { width: 12px; height: 12px; color: var(--accent); fill: var(--accent); }
.review-user .u-stars svg.empty { color: #D6E0EA; fill: #D6E0EA; }
.review-card p { font-size: 14px; line-height: 22px; color: var(--text-2); }
.review-card .r-time { font-size: 12px; color: var(--text-3); margin-top: 10px; }

/* FAQ */
.faq { background: var(--bg-body); }
.faq-inner { max-width: 820px; margin: 40px auto 0; }
.faq-item {
  background: var(--bg-white); border-radius: 12px;
  margin-bottom: 12px; overflow: hidden;
  border: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.faq-item.active { border-color: var(--primary-light); box-shadow: var(--shadow-card); }
.faq-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px; cursor: pointer; font-size: 16px;
  font-weight: 600; color: var(--text-1); user-select: none;
  transition: color var(--transition);
}
.faq-header:hover { color: var(--primary); }
.faq-icon {
  width: 28px; height: 28px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--primary-light); color: var(--primary);
  font-size: 18px; line-height: 1; transition: transform 0.3s ease, background 0.3s ease;
}
.faq-item.active .faq-icon { transform: rotate(45deg); background: var(--primary); color: #fff; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-answer-inner { padding: 0 22px 18px; font-size: 14px; line-height: 24px; color: var(--text-2); }
.faq-more { text-align: center; margin-top: 24px; font-size: 14px; color: var(--text-3); }
.faq-more a { color: var(--primary); font-weight: 500; }
.faq-more a:hover { text-decoration: underline; }

/* CTA */
.cta-section { background: var(--bg-soft); }
.cta-box {
  background: var(--bg-white); border-radius: 24px;
  padding: 56px 40px; text-align: center;
  box-shadow: var(--shadow-card); max-width: 900px; margin: 0 auto;
}
.cta-box h2 { font-size: 28px; font-weight: 600; color: var(--text-1); }
.cta-box .cta-sub { font-size: 15px; color: var(--text-2); margin-top: 10px; }
.cta-btns { display: flex; justify-content: center; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
.cta-qr { margin-top: 28px; display: flex; align-items: center; justify-content: center; gap: 18px; flex-wrap: wrap; }
.cta-qr .qr-img {
  width: 120px; height: 120px; background: #fff;
  border: 1px solid var(--border); border-radius: 12px;
  padding: 8px; display: flex; align-items: center; justify-content: center;
}
.cta-safe {
  margin-top: 24px; font-size: 13px; color: var(--text-3);
  display: flex; justify-content: center; gap: 20px; flex-wrap: wrap;
}
.cta-safe span { display: inline-flex; align-items: center; gap: 6px; }
.cta-safe svg { width: 14px; height: 14px; color: var(--success); }

/* Footer */
.footer { background: #0D1B2A; color: #C7D4E0; padding: 56px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1.2fr; gap: 40px; padding-bottom: 40px; }
.footer h4 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 18px; }
.footer-about p { font-size: 14px; line-height: 22px; color: #8CA0B4; margin-top: 16px; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: #8CA0B4; font-size: 14px; transition: color var(--transition); }
.footer-links a:hover { color: #fff; }
.footer-help .help-list { display: flex; flex-direction: column; gap: 10px; }
.footer-help .help-list span { font-size: 14px; color: #8CA0B4; display: flex; gap: 6px; align-items: center; }
.footer-help .help-list svg { width: 14px; height: 14px; color: var(--success); }
.footer-qr { display: flex; align-items: center; gap: 16px; margin-top: 8px; }
.footer-qr .qr-box {
  width: 100px; height: 100px; background: #fff; border-radius: 12px;
  padding: 6px; display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.footer-qr .qr-box svg { width: 100%; height: 100%; }
.footer-qr p { font-size: 12px; color: #8CA0B4; line-height: 18px; }
.footer-divider { border: none; border-top: 1px solid #263B4D; }
.footer-bottom { padding: 22px 0; display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.footer-bottom p { font-size: 13px; color: #8CA0B4; }
.footer-bottom .beian a { color: #8CA0B4; font-size: 13px; }
.footer-bottom .beian a:hover { color: #fff; }

/* Mobile Download Bar */
.mobile-download-bar {
  display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 999;
  background: rgba(255,255,255,0.97); backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
  padding: 10px 16px; align-items: center; gap: 12px;
  box-shadow: 0 -4px 16px rgba(20,50,100,0.08);
}
.mobile-download-bar .mdb-icon { width: 36px; height: 36px; border-radius: 8px; overflow: hidden; flex-shrink: 0; }
.mobile-download-bar .mdb-info { flex: 1; min-width: 0; line-height: 1.2; }
.mobile-download-bar .mdb-info strong { display: block; font-size: 14px; color: var(--text-1); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mobile-download-bar .mdb-info span { font-size: 12px; color: var(--text-3); }
.mobile-download-bar .mdb-btn { height: 34px; padding: 0 16px; font-size: 13px; border-radius: 8px; flex-shrink: 0; }
.mobile-download-bar .mdb-close { flex-shrink: 0; background: none; border: none; color: var(--text-3); font-size: 18px; cursor: pointer; width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; border-radius: 50%; transition: background var(--transition); }
.mobile-download-bar .mdb-close:hover { background: var(--bg-body); color: var(--text-1); }

/* Responsive */
@media (max-width: 1024px) {
  .hero h1 { font-size: 30px; line-height: 38px; }
  .hero-sub { font-size: 15px; }
  .hero-inner { gap: 32px; }
  .hero-right { flex-basis: 42%; }
  .hero-left { flex: 0 0 58%; }
  .search-box input { width: 140px; }
  .search-box input:focus { width: 180px; }
  .reviews-grid { grid-template-columns: 1fr; }
  .review-summary { padding: 24px; }
  .slide-card { flex: 0 0 calc(50% - 12px); }
}
@media (max-width: 767px) {
  .container { padding: 0 16px; }
  .section { padding: 56px 0; }
  .section-title { font-size: 22px; line-height: 30px; }
  .header-inner { height: 60px; gap: 12px; }
  .brand-text strong { font-size: 14px; }
  .nav-toggle { display: flex; }
  .nav-panel {
    display: none; position: absolute; top: 60px; left: 0; right: 0;
    background: var(--bg-white); border-bottom: 1px solid var(--border);
    box-shadow: 0 12px 32px rgba(20,50,100,0.08);
    flex-direction: column; align-items: stretch; padding: 12px 16px; gap: 4px;
  }
  .nav-panel.open { display: flex; }
  .nav-link { padding: 12px 16px; }
  .header-actions .btn-text { display: none; }
  .header-actions .search-box { display: none; }
  .hero { padding: 40px 0 56px; background-image: none; }
  .hero-inner { flex-direction: column; gap: 32px; }
  .hero-left, .hero-right { flex: 0 0 100%; max-width: 100%; }
  .hero h1 { font-size: 28px; line-height: 36px; }
  .hero-sub { font-size: 15px; }
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { width: 100%; }
  .hero-trust { flex-direction: column; align-items: flex-start; gap: 12px; }
  .float-badge.badge-1 { left: 8px; }
  .float-badge.badge-2 { right: 8px; }
  .features-grid { grid-template-columns: 1fr; }
  .features-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .slide-card { flex: 0 0 80%; }
  .carousel-arrow { display: none; }
  .req-grid { grid-template-columns: 1fr; }
  .req-card-head { flex-wrap: wrap; }
  .req-card-head .btn { margin-left: auto; }
  .news-item { flex-direction: column; align-items: flex-start; gap: 12px; }
  .news-thumb { width: 100%; height: 180px; }
  .reviews-grid { grid-template-columns: 1fr; }
  .review-cards { grid-template-columns: 1fr; }
  .faq-header { font-size: 15px; }
  .cta-box { padding: 40px 20px; }
  .cta-btns .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer { padding-top: 40px; }
  .mobile-download-bar { display: flex; }
  body { padding-bottom: 0; }
  .footer { padding-bottom: 70px; }
}
@media (max-width: 479px) {
  body { font-size: 15px; }
  .hero h1 { font-size: 24px; line-height: 34px; }
  .hero-sub { font-size: 14px; }
  .section-title { font-size: 20px; }
  .btn-lg { height: 50px; font-size: 16px; padding: 0 24px; }
  .cta-box h2 { font-size: 22px; }
  .review-summary { padding: 20px; }
  .summary-big { font-size: 40px; }
}

/* roulang page: article */
:root {
    --bg-body: #F6F9FC;
    --bg-white: #FFFFFF;
    --bg-soft: #EEF5FC;
    --primary: #1E6FFF;
    --primary-deep: #0E46D1;
    --primary-light: #EAF2FF;
    --accent: #FF6B2C;
    --accent-deep: #E85A1F;
    --success: #00B578;
    --text-1: #16263D;
    --text-2: #5A7189;
    --text-3: #8CA0B4;
    --border: #E3ECF5;
    --shadow-card: 0 4px 16px rgba(20,50,100,0.05), 0 1px 2px rgba(20,50,100,0.04);
    --shadow-hover: 0 12px 32px rgba(20,80,180,0.10), 0 2px 6px rgba(20,80,180,0.04);
    --radius-xs: 6px;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-pill: 999px;
    --transition: 0.25s ease;
}
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, sans-serif;
    background: var(--bg-body);
    color: var(--text-1);
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-deep); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input { font-family: inherit; }
ul, ol { list-style: none; }
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
}
/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    height: 72px;
    border-bottom: 1px solid transparent;
    transition: box-shadow var(--transition), border-color var(--transition);
}
.header.scrolled {
    border-bottom-color: var(--border);
    box-shadow: 0 4px 16px rgba(20,50,100,0.06);
}
.header-inner {
    display: flex;
    align-items: center;
    height: 72px;
    gap: 28px;
}
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.brand-badge {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.brand-badge svg { display: block; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-1);
    white-space: nowrap;
}
.brand-text span {
    font-size: 11px;
    color: var(--text-3);
    margin-top: 2px;
}
.nav-panel {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
}
.nav-link {
    display: inline-flex;
    align-items: center;
    height: 38px;
    padding: 0 16px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-2);
    transition: all var(--transition);
    white-space: nowrap;
}
.nav-link:hover { color: var(--text-1); background: rgba(30,111,255,0.06); }
.nav-link.active { color: var(--primary-deep); background: var(--primary-light); font-weight: 600; }
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: auto;
    flex-shrink: 0;
}
.search-box {
    display: flex;
    align-items: center;
    width: 180px;
    height: 38px;
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    padding: 0 14px;
    gap: 8px;
    transition: all 0.3s ease;
}
.search-box:focus-within {
    width: 240px;
    border-color: var(--primary);
    background: var(--bg-white);
    box-shadow: 0 0 0 3px rgba(30,111,255,0.10);
}
.search-box svg { width: 16px; height: 16px; color: var(--text-3); flex-shrink: 0; }
.search-box input {
    width: 100%;
    border: none;
    outline: none;
    background: transparent;
    font-size: 14px;
    color: var(--text-1);
}
.search-box input::placeholder { color: var(--text-3); }
.btn-text {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-2);
    padding: 6px 12px;
    border-radius: 8px;
    transition: all var(--transition);
}
.btn-text:hover { color: var(--primary); background: var(--primary-light); }
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    height: 44px;
    padding: 0 22px;
    transition: all var(--transition);
    white-space: nowrap;
    border: 2px solid transparent;
}
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }
.btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.btn-accent {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.btn-accent:hover { background: var(--accent-deep); border-color: var(--accent-deep); color: #fff; transform: translateY(-1px); box-shadow: 0 6px 16px rgba(255,107,44,0.25); }
.btn-accent:active { transform: translateY(0); }
.btn-secondary {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}
.btn-secondary:hover { background: var(--primary-deep); border-color: var(--primary-deep); color: #fff; transform: translateY(-1px); box-shadow: 0 6px 16px rgba(30,111,255,0.22); }
.btn-outline {
    background: transparent;
    color: #33536F;
    border-color: #CBD8E8;
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: rgba(30,111,255,0.04); transform: translateY(-1px); }
.btn-sm { height: 36px; padding: 0 18px; font-size: 14px; border-radius: 8px; }
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    align-items: center;
    justify-content: center;
    background: var(--bg-body);
    border: 1px solid var(--border);
    transition: all var(--transition);
}
.nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text-1);
    border-radius: 2px;
    transition: all 0.3s ease;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
/* Main */
.main {
    background: var(--bg-body);
    padding: 32px 0 72px;
}
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-3);
    margin-bottom: 28px;
    flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-2); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: #C6D2DE; }
.breadcrumb .current { color: var(--text-1); font-weight: 500; }
/* Article Header */
.article-header {
    max-width: 800px;
    margin: 0 auto 36px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 40px 40px 32px;
    box-shadow: var(--shadow-card);
}
.article-header h1 {
    font-size: 30px;
    line-height: 1.4;
    font-weight: 600;
    color: var(--text-1);
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}
.article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--primary-light);
    color: var(--primary-deep);
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius-pill);
    padding: 4px 12px;
}
.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--text-3);
}
.meta-item svg { width: 15px; height: 15px; }
.article-summary {
    background: #F4F8FE;
    border-left: 4px solid var(--primary);
    border-radius: 8px;
    padding: 16px 20px;
    font-size: 15px;
    line-height: 1.75;
    color: var(--text-2);
}
/* Article Body */
.article-body {
    max-width: 800px;
    margin: 0 auto 40px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-card);
    line-height: 1.85;
    font-size: 16px;
    color: var(--text-1);
    overflow-wrap: break-word;
}
.article-body p { margin: 0 0 1.6em; }
.article-body h2 {
    font-size: 24px;
    font-weight: 600;
    margin: 40px 0 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
    color: var(--text-1);
    line-height: 1.4;
}
.article-body h3 {
    font-size: 20px;
    font-weight: 600;
    margin: 32px 0 12px;
    color: var(--text-1);
    line-height: 1.4;
}
.article-body h4 {
    font-size: 17px;
    font-weight: 600;
    margin: 24px 0 10px;
    color: var(--text-1);
}
.article-body img {
    max-width: 100%;
    border-radius: 12px;
    margin: 24px 0;
    height: auto;
}
.article-body figure {
    margin: 24px 0;
}
.article-body figcaption {
    font-size: 13px;
    color: var(--text-3);
    text-align: center;
    margin-top: 10px;
}
.article-body blockquote {
    border-left: 4px solid var(--primary);
    background: #F4F8FE;
    border-radius: 8px;
    padding: 16px 20px;
    margin: 24px 0;
    color: var(--text-2);
    font-size: 15px;
}
.article-body ul, .article-body ol {
    margin: 16px 0 16px 24px;
}
.article-body ul li {
    list-style: disc;
    margin-bottom: 8px;
    padding-left: 4px;
}
.article-body ul li::marker { color: var(--primary); }
.article-body ol li {
    list-style: decimal;
    margin-bottom: 8px;
    padding-left: 4px;
}
.article-body ol li::marker { color: var(--primary); font-weight: 600; }
.article-body a { color: var(--primary); text-decoration: none; border-bottom: 1px solid rgba(30,111,255,0.2); }
.article-body a:hover { color: var(--primary-deep); border-bottom-color: var(--primary-deep); text-decoration: none; }
.article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 14px;
}
.article-body th, .article-body td {
    border: 1px solid var(--border);
    padding: 10px 14px;
    text-align: left;
}
.article-body th { background: var(--bg-soft); font-weight: 600; }
.article-body tr:nth-child(even) td { background: #FBFDFF; }
.article-body pre {
    background: #F4F6FA;
    border-radius: 8px;
    padding: 16px 20px;
    overflow-x: auto;
    font-size: 14px;
    line-height: 1.7;
    margin: 24px 0;
}
.article-body code {
    font-family: "SF Mono", Consolas, "Courier New", monospace;
    background: #F0F3F9;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.92em;
}
.article-body pre code { background: none; padding: 0; }
.article-body hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 32px 0;
}
/* Article Bottom */
.article-bottom {
    max-width: 800px;
    margin: 0 auto 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    box-shadow: var(--shadow-card);
}
.article-tags {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.tag {
    display: inline-flex;
    align-items: center;
    background: var(--primary-light);
    color: var(--primary-deep);
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius-pill);
    padding: 4px 12px;
    transition: all var(--transition);
}
.tag:hover { background: var(--primary); color: #fff; }
.article-share {
    display: flex;
    align-items: center;
    gap: 8px;
}
.share-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-body);
    color: var(--text-2);
    transition: all var(--transition);
}
.share-btn:hover { background: var(--primary-light); color: var(--primary); transform: scale(1.06); }
.share-btn svg { width: 17px; height: 17px; }
/* Related */
.related-posts {
    max-width: 800px;
    margin: 0 auto 40px;
}
.related-posts h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-1);
    position: relative;
    padding-left: 14px;
}
.related-posts h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 20px;
    border-radius: 2px;
    background: var(--primary);
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.related-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}
.related-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.related-card .thumb {
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--bg-soft);
}
.related-card .thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.related-card:hover .thumb img { transform: scale(1.03); }
.related-card .card-body {
    padding: 16px 18px 18px;
    display: flex;
    flex-direction: column;
    flex: 1;
}
.related-card h3 {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.5;
    color: var(--text-1);
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color var(--transition);
}
.related-card:hover h3 { color: var(--primary); }
.related-card p {
    font-size: 14px;
    color: var(--text-2);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
    flex: 1;
}
.related-card .more {
    font-size: 13px;
    font-weight: 500;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.related-card .more svg { width: 14px; height: 14px; transition: transform var(--transition); }
.related-card:hover .more svg { transform: translateX(4px); }
/* Back */
.article-back {
    max-width: 800px;
    margin: 0 auto;
    text-align: left;
}
/* Empty */
.empty-state {
    max-width: 800px;
    margin: 40px auto;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 60px 40px;
    text-align: center;
}
.empty-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--bg-soft);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--text-3);
}
.empty-icon svg { width: 28px; height: 28px; }
.empty-state p {
    font-size: 18px;
    font-weight: 500;
    color: var(--text-1);
    margin-bottom: 20px;
}
/* Footer */
.footer {
    background: #0D1B2A;
    color: #C7D4E0;
    padding: 56px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid #263B4D;
}
.footer-about .brand-text strong { color: #fff; }
.footer-about .brand-text span { color: #7C8EA3; }
.footer-about p {
    font-size: 14px;
    line-height: 1.7;
    color: #A0B4C8;
    margin-top: 16px;
}
.footer-links h4,
.footer-help h4 {
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 18px;
}
.footer-links ul li { margin-bottom: 10px; }
.footer-links ul li a {
    font-size: 14px;
    color: #A0B4C8;
    transition: all var(--transition);
}
.footer-links ul li a:hover { color: #fff; padding-left: 4px; }
.help-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 18px;
}
.help-list span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #A0B4C8;
}
.help-list svg { width: 14px; height: 14px; color: var(--success); flex-shrink: 0; }
.footer-qr {
    display: flex;
    align-items: center;
    gap: 16px;
}
.qr-box {
    width: 92px;
    height: 92px;
    background: #fff;
    border-radius: 12px;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}
.qr-box svg { width: 76px; height: 76px; display: block; }
.footer-qr > span {
    font-size: 13px;
    color: #7C8EA3;
    line-height: 1.5;
}
.footer-bottom {
    padding: 24px 0 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 13px;
    color: #7C8EA3;
}
.footer-bottom-links {
    display: flex;
    gap: 20px;
    align-items: center;
}
.footer-bottom-links a {
    font-size: 13px;
    color: #7C8EA3;
    transition: color var(--transition);
}
.footer-bottom-links a:hover { color: #fff; }
.footer-bottom-copy {
    font-size: 13px;
    color: #7C8EA3;
}
/* Responsive */
@media (max-width: 1023px) {
    .header { height: 64px; }
    .header-inner { height: 64px; gap: 16px; }
    .nav-panel {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        align-items: stretch;
        padding: 12px 16px;
        gap: 4px;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 12px 24px rgba(20,50,100,0.10);
        display: none;
        z-index: 99;
    }
    .nav-panel.open { display: flex; }
    .nav-link { height: 44px; border-radius: 8px; }
    .search-box { width: 150px; }
    .search-box:focus-within { width: 190px; }
    .nav-toggle { display: flex; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .related-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 767px) {
    .container { padding-left: 16px; padding-right: 16px; }
    .header { height: 60px; }
    .header-inner { height: 60px; gap: 10px; }
    .brand-text strong { font-size: 14px; }
    .brand-text span { font-size: 10px; }
    .search-box { display: none; }
    .btn-text { display: none; }
    .btn-sm { padding: 0 14px; font-size: 13px; height: 34px; }
    .nav-panel { top: 60px; }
    .main { padding: 20px 0 48px; }
    .article-header { padding: 24px 20px; }
    .article-header h1 { font-size: 24px; line-height: 1.45; }
    .article-body { padding: 24px 20px; font-size: 15px; line-height: 1.8; }
    .article-body h2 { font-size: 20px; }
    .article-body h3 { font-size: 17px; }
    .article-bottom { padding: 16px; flex-direction: column; align-items: flex-start; }
    .related-grid { grid-template-columns: 1fr; }
    .footer { padding-top: 40px; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .breadcrumb { font-size: 13px; gap: 6px; margin-bottom: 20px; }
    .empty-state { padding: 40px 24px; }
}
@media (max-width: 479px) {
    .brand-badge { width: 32px; height: 32px; }
    .brand-text strong { font-size: 13px; }
    .brand-text span { font-size: 9px; }
    .btn-sm { padding: 0 10px; }
    .article-meta { gap: 10px; }
}

/* roulang page: category1 */
:root {
  --bg-body: #F6F9FC;
  --bg-white: #FFFFFF;
  --bg-soft: #EEF5FC;
  --primary: #1E6FFF;
  --primary-deep: #0E46D1;
  --primary-light: #EAF2FF;
  --accent: #FF6B2C;
  --accent-deep: #E85A1F;
  --success: #00B578;
  --text-1: #16263D;
  --text-2: #5A7189;
  --text-3: #8CA0B4;
  --border: #E3ECF5;
  --shadow-card: 0 4px 16px rgba(20,50,100,0.05), 0 1px 2px rgba(20,50,100,0.04);
  --shadow-hover: 0 12px 32px rgba(20,80,180,0.10), 0 2px 6px rgba(20,80,180,0.04);
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --transition: 0.25s ease;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, sans-serif;
  background: var(--bg-body);
  color: var(--text-1);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-deep); }
img { max-width: 100%; display: block; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }
input { font-family: inherit; border: none; outline: none; }
ul, ol { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 767px) {
  .container { padding: 0 16px; }
}

/* ===== Header ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 200;
  height: 72px;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.header.scrolled {
  box-shadow: 0 4px 16px rgba(20,50,100,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--primary-light);
  flex-shrink: 0;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
  white-space: nowrap;
}
.brand-text span {
  font-size: 11px;
  color: var(--text-3);
  margin-top: 2px;
  letter-spacing: 0.5px;
}
.nav-panel {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.nav-link {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--text-2);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.nav-link:hover { color: var(--text-1); background: rgba(230,240,250,0.6); }
.nav-link.active { color: var(--primary-deep); background: var(--primary-light); font-weight: 600; }
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.search-box {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 180px;
  height: 38px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: #F8FAFD;
  transition: width 0.3s ease, border-color var(--transition), box-shadow var(--transition);
}
.search-box:focus-within {
  width: 240px;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30,111,255,0.10);
}
.search-box svg { width: 16px; height: 16px; color: var(--text-3); flex-shrink: 0; }
.search-box input {
  background: transparent;
  font-size: 14px;
  color: var(--text-1);
  width: 100%;
}
.search-box input::placeholder { color: var(--text-3); }
.btn-text {
  font-size: 14px;
  color: var(--text-2);
  padding: 6px 8px;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}
.btn-text:hover { color: var(--text-1); background: #F0F4F9; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  padding: 12px 24px;
  transition: all var(--transition);
}
.btn-sm { height: 38px; padding: 0 18px; font-size: 14px; border-radius: 10px; }
.btn-accent {
  background: var(--accent);
  color: #fff;
}
.btn-accent:hover { background: var(--accent-deep); color: #fff; transform: translateY(-1px); box-shadow: 0 6px 16px rgba(255,107,44,0.25); }
.btn-accent:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-deep); color: #fff; transform: translateY(-1px); }
.btn-outline {
  background: transparent;
  border: 2px solid #CBD8E8;
  color: #33536F;
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: #F8FAFD; }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ===== Page Hero ===== */
.page-hero {
  background: var(--bg-body);
  padding: 52px 0 40px;
  border-bottom: 1px solid var(--border);
}
.breadcrumb {
  font-size: 14px;
  color: var(--text-3);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-2); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: #C6D4E2; }
.breadcrumb .current { color: var(--text-1); font-weight: 500; }
.page-hero h1 {
  font-size: 32px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-1);
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}
.page-hero .hero-desc {
  font-size: 15px;
  color: var(--text-2);
  max-width: 760px;
  line-height: 1.7;
}

/* ===== Content Layout ===== */
.content-layout {
  display: flex;
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 80px;
  align-items: flex-start;
}
.content-main {
  flex: 1;
  min-width: 0;
}
.content-sidebar {
  width: 320px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: 96px;
}
@media (max-width: 1023px) {
  .content-layout { flex-direction: column; }
  .content-sidebar { width: 100%; position: static; }
}

/* ===== Feature Card ===== */
.feature-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  margin-bottom: 40px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.feature-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
.feature-card-inner {
  display: flex;
  flex-direction: column;
  color: var(--text-1);
}
.feature-card-image {
  aspect-ratio: 16/7;
  overflow: hidden;
  background: var(--bg-soft);
  position: relative;
}
.feature-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.feature-card:hover .feature-card-image img { transform: scale(1.02); }
.feature-card-content {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.feature-card-content .tag {
  align-self: flex-start;
  background: var(--primary-light);
  color: var(--primary-deep);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.3px;
}
.feature-card-content h3 {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-1);
  line-height: 1.4;
}
.feature-card-content p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
}
.meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-3);
  margin-top: 4px;
}

/* ===== Section Head ===== */
.section-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.section-head h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-1);
  line-height: 1.4;
}
.section-head .section-sub {
  font-size: 13px;
  color: var(--text-3);
  background: #F0F4F9;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}

/* ===== Card Grid ===== */
.card-grid-section {
  margin-bottom: 40px;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.grid-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}
.grid-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
.grid-card-thumb {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-soft);
}
.grid-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.grid-card:hover .grid-card-thumb img { transform: scale(1.03); }
.grid-card-body { padding: 20px 24px 24px; }
.grid-card-body h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 8px;
  line-height: 1.4;
}
.grid-card-body p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.65;
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.text-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.text-link:hover { color: var(--primary-deep); }
.text-link::after {
  content: "→";
  transition: transform 0.3s ease;
}
.text-link:hover::after { transform: translateX(3px); }

/* ===== Horizontal List ===== */
.list-section {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 28px;
}
.list-section .section-head { margin-bottom: 8px; }
.side-list {
  display: flex;
  flex-direction: column;
}
.list-row {
  display: flex;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid #EEF3F8;
  transition: background var(--transition);
  align-items: center;
}
.list-row:last-child { border-bottom: none; }
.list-row:hover { background: #F8FAFD; }
.list-row img {
  width: 120px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  background: var(--bg-soft);
}
.list-row-body { min-width: 0; }
.list-row-body h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 4px;
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.list-row-body p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.6;
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.list-row-body .meta-row { margin-top: 2px; gap: 14px; }

/* ===== Sidebar ===== */
.sidebar-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 24px;
}
.sidebar-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid #EEF3F8;
}
.cta-card {
  text-align: center;
  background: var(--bg-white);
}
.cta-card .cta-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  background: var(--primary-light);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cta-card .cta-icon svg { width: 28px; height: 28px; stroke: var(--primary); }
.cta-card p {
  font-size: 14px;
  color: var(--text-2);
  margin-bottom: 18px;
  line-height: 1.6;
}
.cta-card .btn {
  width: 100%;
  margin-bottom: 16px;
}
.qr-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}
.qr-box {
  width: 104px;
  height: 104px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.qr-box svg { width: 84px; height: 84px; }
.qr-wrap span {
  font-size: 12px;
  color: var(--text-3);
}
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.tag-list a {
  background: var(--primary-light);
  color: var(--primary-deep);
  font-size: 13px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}
.tag-list a:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-1px);
}
.update-list {
  display: flex;
  flex-direction: column;
}
.update-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid #EEF3F8;
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.5;
}
.update-item:last-child { border-bottom: none; }
.update-item .version {
  font-weight: 600;
  color: var(--primary-deep);
  background: var(--primary-light);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 12px;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.update-item .update-date {
  margin-left: auto;
  color: var(--text-3);
  font-size: 12px;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

/* ===== Footer ===== */
.footer {
  background: #0D1B2A;
  color: #C7D4E0;
  padding-top: 56px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 40px;
}
.footer-about .brand {
  margin-bottom: 16px;
}
.footer-about .brand-text strong { color: #fff; }
.footer-about .brand-text span { color: #8CA0B4; }
.footer-about p {
  font-size: 14px;
  line-height: 1.8;
  color: #A5B8C9;
}
.footer-links h4,
.footer-help h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}
.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  color: #A5B8C9;
  font-size: 14px;
  transition: color var(--transition), padding-left var(--transition);
}
.footer-links a:hover {
  color: #fff;
  padding-left: 4px;
}
.help-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}
.help-list span {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #A5B8C9;
}
.help-list svg {
  width: 16px;
  height: 16px;
  color: var(--success);
  flex-shrink: 0;
}
.footer-qr {
  display: flex;
  align-items: center;
  gap: 12px;
}
.footer-qr .qr-box {
  background: #fff;
  border-radius: 12px;
}
.footer-qr .qr-box svg { width: 84px; height: 84px; }
.footer-qr span {
  font-size: 13px;
  color: #A5B8C9;
}
.footer-divider {
  height: 1px;
  background: #263B4D;
}
.footer-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  padding: 20px 0;
  font-size: 13px;
  color: #8CA0B4;
}
.footer-copyright {
  border-top: 1px solid #263B4D;
  padding: 18px 0 24px;
  text-align: center;
  font-size: 13px;
  color: #8CA0B4;
}
.footer-copyright p { line-height: 1.6; }

/* ===== Mobile bottom bar ===== */
.bottom-download-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
  padding: 10px 16px;
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  z-index: 150;
  box-shadow: 0 -4px 16px rgba(20,50,100,0.06);
}
.bottom-download-bar .bar-info {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.bottom-download-bar .bar-logo {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.bottom-download-bar .bar-logo svg { width: 22px; height: 22px; }
.bottom-download-bar .bar-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}
.bottom-download-bar .bar-text strong {
  font-size: 14px;
  color: var(--text-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.bottom-download-bar .bar-text span {
  font-size: 12px;
  color: var(--text-3);
}
.bottom-download-bar .btn {
  flex-shrink: 0;
  height: 36px;
  padding: 0 16px;
  border-radius: 10px;
}
.bottom-download-bar .bar-close {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-3);
  border-radius: 50%;
  flex-shrink: 0;
  transition: background var(--transition), color var(--transition);
}
.bottom-download-bar .bar-close:hover { background: #F0F4F9; color: var(--text-1); }
@media (max-width: 767px) {
  .bottom-download-bar { display: flex; }
  body { padding-bottom: 64px; }
}

/* ===== Responsive ===== */
@media (max-width: 1023px) {
  .header { height: 64px; }
  .header-inner { height: 64px; }
  .search-box { display: none; }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .card-grid { gap: 16px; }
}
@media (max-width: 767px) {
  .header { height: 60px; }
  .header-inner { height: 60px; gap: 12px; }
  .brand-text strong { font-size: 14px; }
  .nav-link { padding: 8px 12px; font-size: 14px; }
  .nav-panel {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 16px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(20,50,100,0.08);
    display: none;
    z-index: 199;
  }
  .nav-panel.open { display: flex; }
  .nav-link {
    border-radius: 10px;
    padding: 12px 14px;
  }
  .header-actions { gap: 6px; }
  .btn-text { display: none; }
  .btn-sm { height: 34px; padding: 0 14px; font-size: 13px; }
  .nav-toggle {
    display: flex;
    margin-left: 2px;
  }
  .page-hero { padding: 36px 0 28px; }
  .page-hero h1 { font-size: 26px; }
  .page-hero .hero-desc { font-size: 14px; }
  .content-layout { padding-top: 28px; padding-bottom: 56px; gap: 32px; }
  .feature-card-image { aspect-ratio: 16/9; }
  .feature-card-content { padding: 20px; }
  .feature-card-content h3 { font-size: 18px; }
  .card-grid { grid-template-columns: 1fr; }
  .list-section { padding: 20px; }
  .list-row { flex-direction: row; gap: 14px; }
  .list-row img { width: 100px; height: 72px; }
  .list-row-body h3 { font-size: 15px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer { padding-top: 40px; }
  .footer-meta { justify-content: flex-start; gap: 10px; }
  .footer-qr { justify-content: flex-start; }
}
@media (max-width: 479px) {
  body { font-size: 15px; }
  .brand-badge { width: 32px; height: 32px; }
  .brand-text strong { font-size: 13px; }
  .card-grid-section { margin-bottom: 32px; }
  .section-head h2 { font-size: 18px; }
  .grid-card-body { padding: 16px 18px 18px; }
  .grid-card-body h3 { font-size: 16px; }
  .meta-row { gap: 10px; font-size: 12px; }
  .page-hero h1 { font-size: 24px; }
}