/* roulang page: index */
:root {
  --primary: #4A7BA6;
  --primary-dark: #356189;
  --primary-light: #E8F0F6;
  --accent: #C97B5D;
  --green: #6F8F72;
  --green-light: #E9F0EA;
  --text-main: #1F2D3D;
  --text-sub: #5B6B7B;
  --bg: #F7FAFC;
  --white: #FFFFFF;
  --border: #E2EAF2;
  --shadow: 0 4px 20px rgba(58, 103, 145, 0.08);
  --shadow-hover: 0 12px 32px rgba(58, 103, 145, 0.14);
  --radius-card: 16px;
  --radius-sm: 12px;
  --radius-btn: 999px;
  --radius-tag: 8px;
  --transition: 0.2s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans CN", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 90px;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; font-size: 16px; }
.container { max-width: 1200px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-btn);
  padding: 12px 28px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  transition: all var(--transition);
  border: 2px solid transparent;
  text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(74, 123, 166, 0.35); }
.btn-primary:active { transform: scale(0.98); }
.btn-outline { background: transparent; border-color: var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); color: var(--primary-dark); border-color: var(--primary-dark); transform: translateY(-2px); }
.btn-outline:active { transform: scale(0.98); }
.btn-green { background: var(--green); color: #fff; }
.btn-green:hover { background: #5D7D61; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(111, 143, 114, 0.35); }
.btn:focus-visible, .nav-link:focus-visible, a:focus-visible, .faq-question:focus-visible, .sticky-close:focus-visible, .nav-toggle:focus-visible {
  outline: 3px solid rgba(74, 123, 166, 0.5);
  outline-offset: 2px;
}
.badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: var(--radius-tag);
  font-size: 13px;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary-dark);
  line-height: 1.5;
}
.badge-accent { background: rgba(201, 123, 93, 0.12); color: var(--accent); }
.badge-green { background: var(--green-light); color: var(--green); }
.section { padding: 80px 0; }
.section-header { text-align: center; max-width: 700px; margin: 0 auto 52px; }
.section-header h2 {
  font-size: clamp(2rem, 4.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--primary-dark);
  margin-bottom: 14px;
}
.section-header p { color: var(--text-sub); font-size: 1.0625rem; line-height: 1.7; }

/* Header */
.site-header { padding-top: 20px; position: relative; z-index: 50; }
.nav-panel {
  background: var(--white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 24px;
  max-width: 1200px;
  margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-icon {
  width: 42px;
  height: 42px;
  background: var(--primary);
  color: #fff;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(74, 123, 166, 0.3);
}
.brand-text { font-size: 20px; font-weight: 700; color: var(--primary-dark); letter-spacing: 0.5px; }
.main-nav { display: flex; align-items: center; gap: 8px; flex: 1; justify-content: center; }
.nav-link {
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-sub);
  transition: all var(--transition);
  background: var(--bg);
  border: 1px solid transparent;
}
.nav-link:hover { color: var(--primary); background: var(--primary-light); }
.nav-link.active { color: var(--primary); background: var(--primary-light); border-color: rgba(74,123,166,0.15); box-shadow: 0 2px 8px rgba(74,123,166,0.08); }
.nav-cta { margin-left: auto; flex-shrink: 0; padding: 10px 24px; font-size: 15px; }
.nav-toggle { display: none; width: 44px; height: 44px; border-radius: var(--radius-sm); background: var(--primary-light); color: var(--primary); font-size: 22px; align-items: center; justify-content: center; transition: all var(--transition); }
.nav-toggle:hover { background: var(--primary); color: #fff; }

/* Hero */
.hero {
  position: relative;
  padding: 110px 0 100px;
  background: linear-gradient(180deg, rgba(247,250,252,0.95) 0%, rgba(232,240,246,0.85) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.9);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.hero-content h1 {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--primary-dark);
  margin-bottom: 20px;
}
.hero-sub {
  font-size: 1.125rem;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 32px;
  max-width: 480px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 36px; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-badge {
  padding: 6px 16px;
  border: 1px solid rgba(74,123,166,0.3);
  border-radius: var(--radius-tag);
  font-size: 13px;
  font-weight: 500;
  color: var(--primary-dark);
  background: rgba(255,255,255,0.8);
}
.hero-badge.tea { border-color: rgba(111,143,114,0.4); color: var(--green); }
.hero-visual {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
}
.hero-visual img { width: 100%; height: 420px; object-fit: cover; border-radius: var(--radius-card); }
.hero-visual::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-card);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.15);
  pointer-events: none;
}

/* Features */
.features { background: var(--white); }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.feature-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 36px 28px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--primary);
}
.feature-card:nth-child(2)::before { background: var(--accent); }
.feature-card:nth-child(3)::before { background: var(--green); }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--primary-light);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
  transition: all var(--transition);
}
.feature-card:hover .feature-icon { background: var(--primary); color: #fff; }
.feature-card:nth-child(2) .feature-icon { background: rgba(201,123,93,0.12); }
.feature-card:nth-child(2):hover .feature-icon { background: var(--accent); color: #fff; }
.feature-card:nth-child(3) .feature-icon { background: var(--green-light); }
.feature-card:nth-child(3):hover .feature-icon { background: var(--green); color: #fff; }
.feature-card h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 10px; color: var(--text-main); }
.feature-card p { color: var(--text-sub); font-size: 0.9375rem; line-height: 1.65; margin-bottom: 16px; }
.feature-link { font-size: 0.875rem; font-weight: 600; color: var(--primary); display: inline-flex; align-items: center; gap: 4px; transition: all var(--transition); }
.feature-link:hover { gap: 8px; color: var(--primary-dark); }

/* Topics */
.topics { background: var(--bg); }
.topics-list { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; max-width: 820px; margin: 0 auto; }
.topic-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 26px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-main);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  cursor: pointer;
}
.topic-tag:hover { background: var(--primary-light); border-color: var(--primary); color: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.topic-tag .topic-icon { font-size: 18px; }

/* Steps */
.steps-section { background: var(--white); }
.steps-layout { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items: center; }
.steps-visual img { width: 100%; height: 440px; object-fit: cover; border-radius: var(--radius-card); box-shadow: var(--shadow-hover); }
.steps-list { display: flex; flex-direction: column; gap: 24px; }
.step-item { display: flex; gap: 20px; align-items: flex-start; }
.step-num {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(74,123,166,0.12);
}
.step-item:nth-child(2) .step-num { background: rgba(201,123,93,0.12); color: var(--accent); }
.step-item:nth-child(3) .step-num { background: var(--green-light); color: var(--green); }
.step-item:nth-child(4) .step-num { background: rgba(201,123,93,0.12); color: var(--accent); }
.step-body h3 { font-size: 1.125rem; font-weight: 600; margin-bottom: 4px; color: var(--text-main); }
.step-body p { color: var(--text-sub); font-size: 0.9375rem; line-height: 1.6; }

/* News */
.news-section { background: var(--bg); }
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.news-card {
  background: var(--white);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.news-thumb { position: relative; overflow: hidden; aspect-ratio: 16 / 9; }
.news-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.news-card:hover .news-thumb img { transform: scale(1.03); }
.news-tag {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 4px 12px;
  border-radius: var(--radius-tag);
  font-size: 13px;
  font-weight: 600;
  background: rgba(255,255,255,0.9);
  color: var(--primary-dark);
  backdrop-filter: blur(4px);
}
.news-body { padding: 22px 22px 20px; display: flex; flex-direction: column; flex: 1; }
.news-body h3 { font-size: 1.125rem; font-weight: 600; line-height: 1.45; margin-bottom: 10px; color: var(--text-main); }
.news-body p { color: var(--text-sub); font-size: 0.875rem; line-height: 1.6; margin-bottom: 16px; flex: 1; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-meta { display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--border); padding-top: 14px; font-size: 0.8125rem; color: var(--text-sub); }
.news-meta .read-more { color: var(--primary); font-weight: 600; transition: all var(--transition); }
.news-card:hover .read-more { gap: 6px; letter-spacing: 1px; color: var(--primary-dark); }
.news-empty {
  text-align: center;
  padding: 60px 20px;
  background: var(--white);
  border-radius: var(--radius-card);
  border: 1px dashed var(--border);
  color: var(--text-sub);
  grid-column: 1 / -1;
}

/* Testimonials */
.testimonials { background: var(--white); }
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-bottom: 52px; }
.testimonial-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 30px;
  box-shadow: var(--shadow);
  position: relative;
  transition: all var(--transition);
}
.testimonial-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.testimonial-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: 8px 8px 0 0;
}
.testimonial-card:nth-child(1)::before { background: var(--green); }
.testimonial-card:nth-child(2)::before { background: var(--accent); }
.testimonial-card:nth-child(3)::before { background: var(--primary); }
.stars { color: #E8A33D; font-size: 18px; letter-spacing: 2px; margin-bottom: 14px; }
.testimonial-text { color: var(--text-sub); font-size: 0.9375rem; line-height: 1.7; margin-bottom: 20px; }
.testimonial-user { display: flex; align-items: center; gap: 12px; }
.user-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 600;
  flex-shrink: 0;
}
.testimonial-user .user-name { font-size: 14px; font-weight: 600; color: var(--text-main); }
.testimonial-user .user-role { font-size: 12px; color: var(--text-sub); }
.stats-row { display: flex; justify-content: center; gap: 24px; flex-wrap: wrap; padding: 32px 0 0; border-radius: var(--radius-card); }
.stat-item { text-align: center; padding: 20px 36px; background: var(--bg); border-radius: var(--radius-card); min-width: 160px; }
.stat-num { font-size: 2.25rem; font-weight: 700; color: var(--primary-dark); line-height: 1.2; }
.stat-label { font-size: 0.875rem; color: var(--text-sub); margin-top: 4px; }

/* Timeline */
.timeline-section { background: var(--bg); }
.timeline {
  max-width: 760px;
  margin: 0 auto;
  position: relative;
  padding-left: 36px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border);
  border-radius: 2px;
}
.timeline-item { position: relative; margin-bottom: 28px; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -30px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid #fff;
  box-shadow: 0 0 0 3px rgba(74,123,166,0.2);
}
.timeline-item:nth-child(2)::before { background: var(--accent); }
.timeline-item:nth-child(3)::before { background: var(--green); }
.timeline-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 20px 28px;
  box-shadow: var(--shadow);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: center;
  transition: all var(--transition);
}
.timeline-card:hover { box-shadow: var(--shadow-hover); transform: translateX(4px); }
.timeline-time { font-weight: 700; color: var(--primary-dark); font-size: 1.0625rem; }
.timeline-title { font-weight: 600; color: var(--text-main); flex: 1; }
.timeline-desc { width: 100%; color: var(--text-sub); font-size: 0.875rem; }
.timeline-action { color: var(--primary); font-size: 0.875rem; font-weight: 600; }

/* FAQ */
.faq-section { background: var(--white); }
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  margin-bottom: 14px;
  background: var(--white);
  overflow: hidden;
  transition: all var(--transition);
  box-shadow: 0 2px 8px rgba(58,103,145,0.04);
}
.faq-item:hover { border-color: rgba(74,123,166,0.3); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
  background: transparent;
  transition: background var(--transition);
}
.faq-question:hover { background: var(--bg); }
.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
  font-size: 16px;
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--primary); color: #fff; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.2s ease; }
.faq-answer p { padding: 0 24px 20px; color: var(--text-sub); font-size: 0.9375rem; line-height: 1.7; }
.faq-item.open .faq-answer { max-height: 400px; }

/* CTA Form */
.cta-section { background: var(--primary-light); position: relative; overflow: hidden; }
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(74,123,166,0.06) 25%, transparent 25%);
  background-size: 32px 32px;
}
.cta-section .container { position: relative; }
.cta-inner { max-width: 640px; margin: 0 auto; text-align: center; }
.cta-inner h2 { color: var(--primary-dark); }
.cta-form { display: grid; grid-template-columns: 1fr 1fr auto; gap: 14px; margin-top: 36px; text-align: left; }
.form-group { position: relative; }
.form-group input {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fff;
  font-size: 16px;
  color: var(--text-main);
  transition: all var(--transition);
  outline: none;
}
.form-group input::placeholder { color: #9AAAB8; }
.form-group input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(74,123,166,0.25);
}
.cta-form .btn { padding: 14px 32px; }
.form-status { margin-top: 16px; font-size: 0.9375rem; min-height: 24px; font-weight: 500; }
.form-status.success { color: var(--green); }
.form-status.error { color: #D9534F; }
.privacy-note { margin-top: 12px; font-size: 0.8125rem; color: var(--text-sub); }

/* Footer */
.site-footer { background: #29435C; color: rgba(255,255,255,0.85); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand .brand-icon { background: rgba(255,255,255,0.15); }
.footer-brand .brand-text { color: #fff; }
.footer-desc { font-size: 0.875rem; line-height: 1.7; color: rgba(255,255,255,0.6); max-width: 260px; }
.footer-col h4 { font-size: 1rem; font-weight: 600; color: #fff; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a { font-size: 0.875rem; color: rgba(255,255,255,0.65); transition: all var(--transition); }
.footer-col ul a:hover { color: #fff; padding-left: 4px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding: 20px 0; text-align: center; font-size: 0.8125rem; color: rgba(255,255,255,0.5); }
.footer-bottom a { color: rgba(255,255,255,0.7); }
.footer-bottom a:hover { color: #fff; }

/* Sticky CTA */
.sticky-cta {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-btn);
  box-shadow: 0 8px 32px rgba(58,103,145,0.2);
  border: 1px solid rgba(255,255,255,0.8);
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 10px 12px 10px 24px;
  z-index: 100;
  max-width: calc(100vw - 32px);
}
.sticky-text { font-size: 0.9375rem; font-weight: 600; color: var(--text-main); white-space: nowrap; }
.sticky-cta .btn { padding: 10px 22px; font-size: 0.875rem; white-space: nowrap; }
.sticky-close {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--bg);
  color: var(--text-sub);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all var(--transition);
  flex-shrink: 0;
}
.sticky-close:hover { background: #E55A5A; color: #fff; }

/* Back to top */
.back-top { position: fixed; right: 20px; bottom: 100px; width: 44px; height: 44px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; box-shadow: 0 4px 16px rgba(74,123,166,0.35); opacity: 0; visibility: hidden; transition: all var(--transition); z-index: 90; }
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* Responsive */
@media (max-width: 991px) {
  .nav-panel { flex-wrap: wrap; gap: 12px; }
  .nav-toggle { display: flex; margin-left: auto; }
  .main-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 6px;
    padding-top: 4px;
  }
  .main-nav.open { display: flex; }
  .nav-link { width: 100%; text-align: left; }
  .nav-cta { display: none; }
  .hero { padding: 80px 0; }
  .hero .container { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual img { height: 340px; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .steps-layout { grid-template-columns: 1fr; gap: 40px; }
  .news-grid { grid-template-columns: 1fr 1fr; }
  .testimonials-grid { grid-template-columns: 1fr 1fr; }
  .cta-form { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 575px) {
  body { padding-bottom: 80px; }
  .section { padding: 56px 0; }
  .container { padding-left: 16px; padding-right: 16px; }
  .nav-panel { padding: 10px 16px; }
  .brand-text { font-size: 17px; }
  .brand-icon { width: 36px; height: 36px; font-size: 18px; }
  .hero { padding: 60px 0; }
  .hero-content h1 { font-size: 2.2rem; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .hero-badges { justify-content: center; }
  .hero-visual img { height: 260px; }
  .features-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .stats-row { flex-direction: column; align-items: center; }
  .stat-item { width: 100%; }
  .timeline { padding-left: 28px; }
  .timeline-item::before { left: -22px; }
  .cta-section .container { padding-left: 16px; padding-right: 16px; }
  .cta-form .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .sticky-cta { flex-wrap: wrap; justify-content: center; padding: 12px 16px; border-radius: 16px; gap: 10px; }
  .sticky-text { font-size: 0.8125rem; }
  .sticky-cta .btn { padding: 8px 18px; font-size: 0.8125rem; }
  .sticky-close { position: absolute; top: -12px; right: -6px; background: #fff; box-shadow: 0 2px 8px rgba(0,0,0,0.15); }
  .back-top { bottom: 90px; right: 12px; }
  .timeline-card { padding: 16px 20px; }
  .timeline-time { width: 100%; margin-bottom: 4px; }
}

/* roulang page: article */
:root {
    --primary: #4A7BA6;
    --primary-dark: #356189;
    --primary-light: #E8F0F6;
    --accent: #C97B5D;
    --tea-green: #6F8F72;
    --text-main: #1F2D3D;
    --text-sub: #5B6B7B;
    --bg: #F7FAFC;
    --white: #FFFFFF;
    --border: #E2EAF2;
    --shadow: 0 4px 20px rgba(58, 103, 145, 0.08);
    --shadow-hover: 0 12px 32px rgba(58, 103, 145, 0.14);
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --radius-btn: 999px;
    --transition: 0.2s ease;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans CN", Inter, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text-main);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    padding-bottom: 84px;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
button { font-family: inherit; cursor: pointer; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-btn);
    font-weight: 600;
    padding: 12px 26px;
    border: 2px solid transparent;
    transition: all var(--transition);
    font-size: .9375rem;
    line-height: 1.4;
    white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(74, 123, 166, .28); }
.btn-primary:active { transform: scale(.98); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); color: var(--primary-dark); border-color: var(--primary-dark); transform: translateY(-2px); }
.btn-outline:active { transform: scale(.98); }
.btn-sm { padding: 8px 18px; font-size: .875rem; }
.btn-block { width: 100%; }
.btn:focus-visible { outline: 3px solid rgba(74, 123, 166, .4); outline-offset: 2px; }

.site-header { position: relative; z-index: 50; padding: 24px 0 8px; }
.nav-panel {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 14px 20px;
    position: relative;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 1.25rem; font-weight: 700; color: var(--text-main); flex-shrink: 0; }
.brand-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0;
}
.main-nav { display: flex; gap: 10px; margin-left: auto; }
.nav-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border-radius: var(--radius-md);
    background: var(--primary-light);
    color: var(--text-sub);
    font-size: .9rem;
    font-weight: 500;
    transition: all var(--transition);
    border-bottom: 2px solid transparent;
}
.nav-link:hover { background: var(--primary-light); color: var(--primary); }
.nav-link.active { background: var(--primary-light); color: var(--primary); font-weight: 600; border-bottom-color: var(--primary); }
.nav-cta { padding: 10px 22px; flex-shrink: 0; }
.nav-toggle {
    display: none;
    background: var(--primary-light);
    border: none;
    border-radius: 10px;
    padding: 10px 12px;
    color: var(--primary);
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
}
.nav-toggle:hover { background: var(--border); }

.article-hero {
    padding: 56px 0 44px;
    background: linear-gradient(180deg, rgba(232, 240, 246, .55), rgba(247, 250, 252, .93)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
    border-bottom: 1px solid var(--border);
}
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: .875rem; color: var(--text-sub); margin-bottom: 24px; }
.breadcrumb a { color: var(--primary); transition: color var(--transition); }
.breadcrumb a:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.breadcrumb-sep { color: #B5C4D2; }
.breadcrumb-current { color: var(--text-sub); font-weight: 500; max-width: 460px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.article-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    line-height: 1.25;
    color: var(--text-main);
    margin: 0 0 20px;
    max-width: 900px;
    letter-spacing: -0.01em;
}
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 8px; }
.meta-badge {
    display: inline-flex;
    align-items: center;
    padding: 5px 14px;
    background: #F3E8E2;
    color: var(--accent);
    border-radius: var(--radius-sm);
    font-size: .8125rem;
    font-weight: 600;
}
.meta-item { display: inline-flex; align-items: center; gap: 6px; font-size: .875rem; color: var(--text-sub); }
.meta-item svg { opacity: .6; }

.article-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 40px;
    align-items: start;
    padding-top: 48px;
    padding-bottom: 64px;
}
.article-main { display: flex; flex-direction: column; gap: 44px; min-width: 0; }
.article-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 44px 52px;
}
.article-content { font-size: 1.0625rem; line-height: 1.8; color: var(--text-main); }
.article-content p { margin: 0 0 1.4em; }
.article-content h2 {
    font-size: 1.625rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 2em 0 .8em;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border);
}
.article-content h3 { font-size: 1.3125rem; font-weight: 600; margin: 1.6em 0 .6em; }
.article-content h4 { font-size: 1.125rem; font-weight: 600; margin: 1.4em 0 .5em; }
.article-content blockquote {
    background: var(--primary-light);
    border-left: 4px solid var(--primary);
    padding: 18px 22px;
    border-radius: 0 12px 12px 0;
    margin: 1.6em 0;
    color: var(--text-sub);
}
.article-content blockquote p:last-child { margin-bottom: 0; }
.article-content ul, .article-content ol { margin: 0 0 1.4em; padding-left: 1.5em; }
.article-content li { margin-bottom: .5em; }
.article-content img { max-width: 100%; height: auto; border-radius: var(--radius-md); margin: 1.6em 0; box-shadow: var(--shadow); }
.article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
.article-content a:hover { color: var(--accent); }
.article-content strong { font-weight: 700; }
.article-content table { width: 100%; border-collapse: collapse; margin: 1.6em 0; font-size: .9375rem; }
.article-content table th, .article-content table td { border: 1px solid var(--border); padding: 10px 14px; text-align: left; }
.article-content table th { background: var(--primary-light); font-weight: 600; }
.article-footer-actions { margin-top: 36px; padding-top: 28px; border-top: 1px solid var(--border); display: flex; justify-content: center; }

.related-section {}
.section-title { font-size: clamp(1.5rem, 2.5vw, 1.875rem); font-weight: 700; margin: 0 0 24px; color: var(--text-main); }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.related-card {
    display: flex;
    flex-direction: column;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}
.related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.related-thumb { aspect-ratio: 16 / 9; overflow: hidden; }
.related-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.related-card:hover .related-thumb img { transform: scale(1.04); }
.related-body { padding: 18px 20px 20px; display: flex; flex-direction: column; flex: 1; gap: 8px; }
.card-badge {
    display: inline-flex;
    align-self: flex-start;
    padding: 4px 12px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius-sm);
    font-size: .75rem;
    font-weight: 600;
}
.related-body h3 { font-size: 1.0625rem; font-weight: 600; line-height: 1.45; margin: 0; color: var(--text-main); }
.related-body h3 a { color: inherit; }
.related-body h3 a:hover { color: var(--primary); }
.related-body p { font-size: .875rem; color: var(--text-sub); margin: 0 0 6px; line-height: 1.6; }
.related-date { font-size: .8125rem; color: #9AA7B4; margin-top: auto; }

.article-sidebar { display: flex; flex-direction: column; gap: 24px; position: sticky; top: 24px; }
.side-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 24px;
}
.side-card h3 { font-size: 1.0625rem; font-weight: 700; margin: 0 0 16px; padding-bottom: 10px; border-bottom: 2px solid var(--primary-light); color: var(--text-main); }
.side-cats { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.side-cats li { margin: 0; }
.side-cats a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 14px;
    background: var(--primary-light);
    color: var(--text-main);
    border-radius: var(--radius-md);
    font-size: .9rem;
    font-weight: 500;
    transition: all var(--transition);
}
.side-cats a::after { content: "›"; color: var(--primary); font-size: 1.125rem; transition: transform var(--transition); }
.side-cats a:hover { background: var(--primary); color: #fff; transform: translateX(3px); }
.side-cats a:hover::after { color: #fff; transform: translateX(2px); }
.side-list { list-style: none; margin: 0; padding: 0; }
.side-list li { margin: 0; padding: 10px 0; border-bottom: 1px dashed var(--border); }
.side-list li:last-child { border-bottom: none; padding-bottom: 0; }
.side-list li:first-child { padding-top: 0; }
.side-list a { font-size: .875rem; color: var(--text-main); line-height: 1.5; font-weight: 500; transition: color var(--transition); }
.side-list a:hover { color: var(--primary); }
.side-card-accent { background: var(--primary-light); border-color: transparent; }
.side-card-accent p { font-size: .875rem; color: var(--text-sub); margin: 0 0 16px; line-height: 1.6; }

.not-found-wrap { padding: 64px 0; }
.not-found-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 56px 40px;
    text-align: center;
    max-width: 620px;
    margin: 0 auto;
}
.not-found-card h1 { font-size: 1.75rem; margin: 0 0 12px; }
.not-found-card p { color: var(--text-sub); margin: 0 0 24px; }

.site-footer { background: #29435C; color: #D6E2ED; }
.site-footer .container { padding-top: 48px; padding-bottom: 24px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 36px; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-size: 1.25rem; font-weight: 700; color: #fff; margin-bottom: 14px; }
.footer-brand .brand-icon { background: #5D8BB0; }
.footer-desc { font-size: .875rem; line-height: 1.75; color: #A9C0D3; margin: 0; max-width: 300px; }
.footer-col h4 { font-size: .9375rem; font-weight: 600; color: #fff; margin: 0 0 16px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-col li { margin: 0; font-size: .875rem; color: #A9C0D3; }
.footer-col a { color: #A9C0D3; transition: color var(--transition); }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .12); padding-top: 20px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.footer-bottom p { font-size: .8125rem; color: #8CA3B5; margin: 0; }

.convert-bar {
    position: fixed;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 999;
    width: min(680px, calc(100% - 32px));
    background: rgba(255, 255, 255, 0.94);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 16px 48px rgba(58, 103, 145, 0.18);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 16px;
}
.convert-text { font-size: .9375rem; color: var(--text-main); margin: 0; flex: 1; line-height: 1.5; font-weight: 500; }
.convert-close {
    border: none;
    background: var(--primary-light);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-sub);
    font-size: .875rem;
    flex-shrink: 0;
    transition: all var(--transition);
}
.convert-close:hover { background: var(--primary); color: #fff; }

@media (max-width: 991px) {
    .nav-panel { flex-wrap: wrap; gap: 14px; }
    .main-nav {
        position: absolute;
        top: calc(100% + 10px);
        left: 0;
        right: 0;
        background: var(--white);
        border: 1px solid var(--border);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-hover);
        padding: 14px;
        display: none;
        flex-direction: column;
        gap: 8px;
        margin: 0;
    }
    .main-nav.open { display: flex; }
    .nav-toggle { display: inline-flex; margin-left: auto; }
    .nav-cta { margin-left: 0; }
    .article-layout { grid-template-columns: 1fr; gap: 40px; }
    .article-sidebar { position: static; }
    .related-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 767px) {
    .article-card { padding: 32px 28px; }
}
@media (max-width: 575px) {
    body { padding-bottom: 108px; }
    .container { padding: 0 16px; }
    .site-header { padding: 16px 0 4px; }
    .nav-panel { padding: 10px 14px; border-radius: 14px; }
    .nav-cta { display: none; }
    .brand-text { font-size: 1.0625rem; }
    .brand-icon { width: 36px; height: 36px; font-size: .875rem; }
    .article-hero { padding: 40px 0 32px; }
    .article-title { font-size: clamp(1.5rem, 6vw, 2rem); }
    .article-meta { gap: 8px; }
    .article-card { padding: 28px 20px; border-radius: 14px; }
    .article-content { font-size: 1rem; }
    .article-content h2 { font-size: 1.375rem; }
    .related-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .convert-bar { flex-wrap: wrap; padding: 14px; gap: 10px; }
    .convert-text { flex: 1 1 100%; font-size: .875rem; }
    .convert-bar .btn { width: 100%; }
    .convert-close { position: absolute; top: -12px; right: 10px; background: var(--white); box-shadow: var(--shadow); }
    .not-found-card { padding: 40px 20px; }
}