/* roulang page: index */
/* ===== Design Tokens ===== */
:root {
  --primary: #3A7BBF;
  --primary-dark: #1F5A8E;
  --primary-light: #EAF1F8;
  --accent: #E8862D;
  --accent-dark: #D4741F;
  --bg: #F7F8FA;
  --card-bg: #FFFFFF;
  --text: #1F2A37;
  --text-secondary: #5B6B7C;
  --text-light: #8B9AAB;
  --border: #E5E9F0;
  --footer-bg: #1F2A44;
  --footer-text: #A7B4C6;
  --footer-text-light: #D3DCE8;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 8px;
  --radius-pill: 100px;
  --shadow-card: 0 2px 8px rgba(31, 42, 55, 0.04), 0 8px 24px rgba(31, 42, 55, 0.04);
  --shadow-card-hover: 0 6px 16px rgba(31, 42, 55, 0.06), 0 16px 40px rgba(31, 42, 55, 0.08);
  --shadow-btn: 0 2px 6px rgba(232, 134, 45, 0.2);
  --transition-base: 0.2s ease;
  --container-max: 1200px;
  --section-gap: 96px;
}
/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition-base); }
a:hover { color: var(--primary-dark); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; font-size: 1rem; }

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ===== Typography ===== */
.section-title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 12px;
}
.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.7;
}
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  transition: all var(--transition-base);
  border: 1.5px solid transparent;
  white-space: nowrap;
}
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--primary);
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-btn);
}
.btn-primary:hover {
  background: var(--accent-dark);
  color: #fff;
  box-shadow: 0 4px 12px rgba(232, 134, 45, 0.3);
}
.btn-primary:disabled { opacity: 0.5; box-shadow: none; pointer-events: none; }
.btn-outline {
  background: #fff;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  border-color: var(--primary-dark);
}
.btn-sm { height: 40px; padding: 0 20px; font-size: 14px; }
.btn-block { width: 100%; }

/* ===== Badges ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
  background: var(--primary-light);
  color: var(--primary-dark);
}
.badge-accent {
  background: rgba(232, 134, 45, 0.12);
  color: var(--accent-dark);
}

/* ===== Header / Nav Panel ===== */
.site-header {
  padding-top: 20px;
  position: sticky;
  top: 0;
  z-index: 100;
  background: transparent;
}
.nav-panel {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  gap: 20px;
  border: 1px solid rgba(229, 233, 240, 0.7);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
}
.brand-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  justify-content: center;
}
.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-base);
}
.nav-item:hover {
  color: var(--primary-dark);
  background: var(--primary-light);
  transform: translateY(-1px);
}
.nav-item.active {
  background: var(--primary);
  color: #fff;
  font-weight: 600;
}
.nav-item.active i { color: #fff; }
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 18px;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}
.nav-toggle:hover { background: var(--primary); color: #fff; }

/* ===== Mobile Nav ===== */
.mobile-nav {
  display: none;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  margin-top: 12px;
  padding: 16px;
}
.mobile-nav .main-nav {
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}
.mobile-nav .nav-item {
  padding: 14px 16px;
  justify-content: flex-start;
}
.mobile-nav .header-actions {
  margin-top: 12px;
  flex-direction: column;
  align-items: stretch;
}
.mobile-nav .btn { width: 100%; }

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 80px 0 72px;
  margin-top: 24px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  min-height: 480px;
  display: flex;
  align-items: center;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(90deg, rgba(255,255,255,0.88) 0%, rgba(255,255,255,0.78) 45%, rgba(255,255,255,0.32) 100%);
}
.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 640px;
}
.hero-badge {
  margin-bottom: 18px;
}
.hero h1 {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
  color: var(--text);
}
.hero-sub {
  font-size: 18px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 520px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.hero-note {
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-note i { color: var(--primary); }

/* ===== Trust Bar ===== */
.trust-bar {
  padding: 24px 0 8px;
}
.trust-inner {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 20px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}
.trust-item i {
  font-size: 18px;
  color: var(--primary);
  width: 20px;
  text-align: center;
}

/* ===== Section Spacing ===== */
.section-block { padding: var(--section-gap) 0; }
.section-block + .section-block { padding-top: 0; }

/* ===== Pain Points ===== */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.pain-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 32px 28px;
  border: 1px solid rgba(229, 233, 240, 0.5);
  transition: all var(--transition-base);
}
.pain-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}
.pain-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--primary-light);
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 20px;
}
.pain-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.4;
}
.pain-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Solutions ===== */
.solutions-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 24px;
  margin-top: 40px;
  align-items: stretch;
}
.solution-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  border: 1px solid rgba(229, 233, 240, 0.5);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}
.solution-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}
.solution-card.featured {
  grid-row: span 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}
.solution-media {
  position: relative;
  min-height: 220px;
  overflow: hidden;
}
.solution-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  top: 0; left: 0;
}
.solution-card.featured .solution-media {
  min-height: 100%;
}
.solution-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.solution-card.featured .solution-body {
  padding: 36px 32px;
}
.solution-tag {
  margin-bottom: 12px;
}
.solution-body h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}
.solution-card:not(.featured) .solution-body h3 { font-size: 17px; }
.solution-body p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
  flex: 1;
}
.solution-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 0;
  border-bottom: 1.5px solid transparent;
  transition: all var(--transition-base);
}
.solution-link:hover {
  color: var(--primary-dark);
  border-bottom-color: var(--primary);
}
.solution-steps {
  margin-top: 20px;
  display: flex;
  align-items: center;
  gap: 0;
}
.step-node {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
}
.step-dot {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.step-text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.3;
}
.step-line {
  width: 24px;
  height: 1.5px;
  background: var(--border);
  flex-shrink: 0;
  margin: 0 6px;
}

/* ===== Stats ===== */
.stats-section {
  background: linear-gradient(180deg, var(--bg) 0%, #EEF2F7 100%);
  border-radius: var(--radius-lg);
  padding: 64px 48px;
}
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 36px;
}
.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 32px;
  display: flex;
  align-items: center;
  gap: 24px;
  transition: all var(--transition-base);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-card-hover); }
.stat-card.wide { grid-column: span 2; }
.stat-number {
  font-size: 48px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}
.stat-label {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.5;
}
.stat-label strong { display: block; font-size: 16px; color: var(--text); margin-bottom: 2px; }

/* ===== News / CMS ===== */
.news-section { position: relative; }
.news-section::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 260px;
  background-image: url('/assets/images/backpic/back-2.webp');
  background-size: cover;
  background-position: center;
  opacity: 0.06;
  border-radius: var(--radius-lg);
  pointer-events: none;
}
.news-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 40px;
}
.news-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border: 1px solid rgba(229, 233, 240, 0.5);
  transition: all var(--transition-base);
  position: relative;
}
.news-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--primary);
}
.news-info { flex: 1; min-width: 0; }
.news-category {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary-dark);
  background: var(--primary-light);
  padding: 2px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 8px;
}
.news-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
  line-height: 1.4;
  transition: color var(--transition-base);
}
.news-card:hover .news-title { color: var(--primary); }
.news-excerpt {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-time {
  font-size: 14px;
  color: var(--text-light);
  flex-shrink: 0;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Empty State */
.empty-state {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 56px 32px;
  text-align: center;
  margin-top: 40px;
  border: 1px dashed var(--border);
}
.empty-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.empty-state p { font-size: 16px; color: var(--text-secondary); }
.empty-state .empty-sub { font-size: 14px; color: var(--text-light); margin-top: 4px; }

/* ===== FAQ ===== */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(229, 233, 240, 0.5);
  overflow: hidden;
  transition: all var(--transition-base);
}
.faq-item:hover { border-color: var(--primary); }
.faq-q {
  padding: 22px 28px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  transition: color var(--transition-base);
}
.faq-q:hover { color: var(--primary); }
.faq-q .faq-toggle {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition-base);
}
.faq-item.open .faq-toggle {
  background: var(--primary);
  color: #fff;
  transform: rotate(135deg);
}
.faq-a {
  padding: 0 28px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
  border-top: 1px solid transparent;
}
.faq-item.open .faq-a {
  padding: 18px 28px 24px;
  max-height: 400px;
  border-top-color: var(--border);
}

/* ===== CTA ===== */
.cta-section {
  position: relative;
  padding: 72px 0;
  margin-bottom: 40px;
}
.cta-card {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  position: relative;
  overflow: hidden;
}
.cta-card::after {
  content: '';
  position: absolute;
  top: -40px; right: -40px;
  width: 200px; height: 200px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 50%;
}
.cta-card::before {
  content: '';
  position: absolute;
  bottom: -60px; right: 80px;
  width: 160px; height: 160px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 50%;
}
.cta-content { position: relative; z-index: 1; flex: 1; }
.cta-content h2 {
  font-size: 26px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
  line-height: 1.4;
}
.cta-content p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.88);
  line-height: 1.7;
  max-width: 480px;
}
.cta-actions { position: relative; z-index: 1; flex-shrink: 0; }
.cta-actions .btn-primary {
  background: #fff;
  color: var(--primary-dark);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}
.cta-actions .btn-primary:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 64px 0 0;
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-brand .brand-text { color: #fff; }
.footer-brand .brand-logo {
  background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0.1) 100%);
  border: 1px solid rgba(255,255,255,0.2);
}
.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--footer-text);
  margin-top: 16px;
  max-width: 280px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--footer-text-light);
  margin-bottom: 16px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  color: var(--footer-text);
  font-size: 14px;
  transition: all var(--transition-base);
}
.footer-col ul li a:hover { color: #fff; padding-left: 4px; }
.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 14px;
  color: var(--footer-text);
  margin-bottom: 12px;
}
.footer-contact i { color: var(--primary); margin-top: 5px; font-size: 13px; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: rgba(167, 180, 198, 0.8);
}
.footer-bottom a { color: rgba(167, 180, 198, 0.8); }
.footer-bottom a:hover { color: #fff; }

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(31, 42, 55, 0.65);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  backdrop-filter: blur(2px);
}
.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}
.modal-content {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  width: 480px;
  max-width: 100%;
  padding: 40px;
  position: relative;
  transform: translateY(20px) scale(0.98);
  transition: transform 0.3s ease;
  box-shadow: 0 20px 60px rgba(31, 42, 55, 0.2);
}
.modal-overlay.active .modal-content {
  transform: translateY(0) scale(1);
}
.modal-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg);
  color: var(--text-secondary);
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}
.modal-close:hover { background: #e5e9f0; color: var(--text); transform: rotate(90deg); }
.modal-content h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
}
.modal-content > p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.6;
}
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea {
  width: 100%;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0 14px;
  font-size: 15px;
  background: #fff;
  color: var(--text);
  transition: all var(--transition-base);
}
.form-group textarea {
  height: auto;
  padding: 12px 14px;
  resize: vertical;
  min-height: 80px;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(58, 123, 191, 0.15);
}
.form-group input.error,
.form-group textarea.error {
  border-color: #d9534f;
  box-shadow: 0 0 0 3px rgba(217, 83, 79, 0.12);
}
.form-error-text {
  display: none;
  font-size: 12px;
  color: #d9534f;
  margin-top: 4px;
}
.form-group.error .form-error-text { display: block; }
.modal-content .btn { margin-top: 8px; }
.privacy-note {
  font-size: 12px;
  color: var(--text-light);
  text-align: center;
  margin-top: 16px;
  line-height: 1.5;
}

/* ===== Breadcrumb (placeholder for inner pages) ===== */
.breadcrumb {
  padding: 20px 0;
  font-size: 14px;
  color: var(--text-light);
}
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb i { font-size: 12px; margin: 0 8px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .pain-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-card.featured { grid-template-columns: 1fr; }
  .solution-card.featured .solution-media { min-height: 200px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 38px; }
}
@media (max-width: 960px) {
  .desktop-nav, .desktop-cta { display: none; }
  .nav-toggle { display: flex; }
  .mobile-nav.open { display: block; }
  .nav-panel { padding: 12px 16px; }
  .brand-text { font-size: 18px; }
  .hero { padding: 60px 0 56px; }
  .hero h1 { font-size: 34px; }
  .hero-sub { font-size: 16px; }
}
@media (max-width: 768px) {
  :root { --section-gap: 56px; }
  .container { padding-left: 16px; padding-right: 16px; }
  .pain-grid { grid-template-columns: 1fr; }
  .solutions-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .stat-card.wide { grid-column: span 1; }
  .cta-card { flex-direction: column; padding: 40px 24px; text-align: center; }
  .cta-content p { margin: 0 auto; }
  .cta-actions .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero { margin-top: 12px; }
  .hero h1 { font-size: 30px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .news-card { flex-direction: column; align-items: flex-start; gap: 8px; }
  .news-time { font-size: 13px; }
  .section-title { font-size: 24px; }
  .stat-number { font-size: 38px; }
  .solution-body { padding: 20px; }
  .modal-content { padding: 24px; }
  .modal-overlay { align-items: flex-end; padding: 0; }
  .modal-content {
    width: 100%;
    border-radius: 20px 20px 0 0;
    transform: translateY(40px);
  }
  .modal-overlay.active .modal-content { transform: translateY(0); }
}
@media (max-width: 520px) {
  .section-title { font-size: 22px; }
  .hero h1 { font-size: 27px; }
  .hero-sub { font-size: 15px; }
  .trust-inner { flex-direction: column; align-items: flex-start; padding: 16px; }
  .stat-card { flex-direction: column; text-align: center; padding: 24px; }
  .faq-q { padding: 18px 20px; font-size: 15px; }
  .faq-a { padding-left: 20px; padding-right: 20px; }
  .faq-item.open .faq-a { padding-left: 20px; padding-right: 20px; }
}

/* roulang page: category1 */
:root {
  --primary: #3A7BBF;
  --primary-dark: #1F5A8E;
  --accent: #E8862D;
  --accent-dark: #d4721f;
  --bg: #F7F8FA;
  --card-bg: #FFFFFF;
  --text: #1F2A37;
  --text-secondary: #5B6B7C;
  --border: #E5E9F0;
  --footer-bg: #1F2A44;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 8px;
  --radius-pill: 100px;
  --shadow-sm: 0 2px 8px rgba(31, 42, 55, 0.04), 0 4px 14px rgba(31, 42, 55, 0.04);
  --shadow-md: 0 4px 16px rgba(31, 42, 55, 0.06), 0 8px 28px rgba(31, 42, 55, 0.06);
  --shadow-lg: 0 6px 24px rgba(31, 42, 55, 0.08), 0 16px 48px rgba(31, 42, 55, 0.08);
  --transition: 0.2s ease;
  --container: 1200px;
  --space: 96px;
}
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}
input,
textarea {
  font-family: inherit;
  font-size: 15px;
  width: 100%;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0 14px;
  background: #fff;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
textarea {
  height: auto;
  min-height: 88px;
  padding: 12px 14px;
  resize: vertical;
}
input:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(58, 123, 191, 0.2);
}
input.error,
textarea.error {
  border-color: #d9534f;
  box-shadow: 0 0 0 2px rgba(217, 83, 79, 0.15);
}
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.section {
  padding: var(--space) 0;
}
@media (max-width: 768px) {
  .section {
    padding: 56px 0;
  }
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 16px 0 8px;
  background: transparent;
}
.nav-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 14px 20px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}
.nav-panel:hover {
  box-shadow: var(--shadow-md);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.5px;
}
.brand-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-mdr);
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.nav-item i {
  font-size: 15px;
  color: var(--primary);
  opacity: 0.8;
}
.nav-item:hover {
  background: rgba(58, 123, 191, 0.08);
  color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(58, 123, 191, 0.1);
}
.nav-item.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(58, 123, 191, 0.3);
}
.nav-item.active i {
  color: #fff;
  opacity: 1;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(58, 123, 191, 0.08);
  color: var(--primary-dark);
  font-size: 18px;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}
.nav-toggle:hover {
  background: rgba(58, 123, 191, 0.18);
}
.mobile-nav {
  display: none;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  margin-top: 8px;
  padding: 20px;
  box-shadow: var(--shadow-md);
}
.mobile-nav .main-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 16px;
}
.mobile-nav .nav-item {
  justify-content: center;
  background: var(--bg);
  border-radius: 10px;
  padding: 14px 12px;
}
.mobile-nav .header-actions {
  width: 100%;
}
.mobile-nav .header-actions .btn {
  width: 100%;
  justify-content: center;
}
.mobile-nav.open {
  display: block;
}
@media (max-width: 960px) {
  .desktop-nav,
  .desktop-cta {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
}
@media (max-width: 520px) {
  .nav-panel {
    padding: 12px 14px;
  }
  .brand-text {
    font-size: 16px;
  }
  .mobile-nav .main-nav {
    grid-template-columns: 1fr;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  transition: all 0.2s ease;
}
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(58, 123, 191, 0.35);
}
.btn:active {
  transform: translateY(1px);
}
.btn:disabled {
  opacity: 0.5;
  box-shadow: none;
  pointer-events: none;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(232, 134, 45, 0.3);
}
.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(232, 134, 45, 0.4);
}
.btn-secondary {
  background: #fff;
  color: var(--primary-dark);
  border: 1.5px solid var(--primary);
}
.btn-secondary:hover {
  background: rgba(58, 123, 191, 0.08);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(31, 90, 142, 0.15);
}
.btn-sm {
  height: 42px;
  padding: 0 20px;
  font-size: 14px;
}

/* Hero */
.page-hero {
  position: relative;
  background: linear-gradient(120deg, rgba(247, 248, 250, 0.92) 40%, rgba(255, 255, 255, 0.75)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  padding: 80px 0 64px;
  border-radius: 0 0 24px 24px;
  margin: 24px 0 0;
}
.page-hero .container {
  position: relative;
  z-index: 2;
}
.hero-breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.hero-breadcrumb a {
  color: var(--primary);
  transition: color 0.2s ease;
}
.hero-breadcrumb a:hover {
  color: var(--primary-dark);
}
.hero-breadcrumb .sep {
  color: var(--border);
}
.hero-breadcrumb .current {
  color: var(--text);
  font-weight: 500;
}
.page-hero h1 {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--text);
  max-width: 620px;
  margin-bottom: 18px;
}
.page-hero .subtitle {
  font-size: 19px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 32px;
}
.hero-ctas {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-note {
  margin-top: 18px;
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}
@media (max-width: 768px) {
  .page-hero {
    padding: 56px 0 44px;
  }
  .page-hero h1 {
    font-size: 32px;
  }
  .page-hero .subtitle {
    font-size: 16px;
  }
}

/* Section Headers */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}
.section-header .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  background: rgba(232, 134, 45, 0.12);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 14px;
  letter-spacing: 0.5px;
}
.section-header h2 {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text);
  margin-bottom: 12px;
}
.section-header p {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
}
@media (max-width: 768px) {
  .section-header h2 {
    font-size: 26px;
  }
}

/* Flow Steps */
.flow-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.step-card {
  position: relative;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 36px 28px 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  border-top: 4px solid transparent;
}
.step-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.step-card:nth-child(1) {
  border-top-color: var(--primary);
}
.step-card:nth-child(2) {
  border-top-color: var(--accent);
}
.step-card:nth-child(3) {
  border-top-color: #6c9a4f;
}
.step-num {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  background: rgba(58, 123, 191, 0.1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
}
.step-card:nth-child(2) .step-num {
  background: rgba(232, 134, 45, 0.12);
  color: var(--accent);
}
.step-card:nth-child(3) .step-num {
  background: rgba(108, 154, 79, 0.14);
  color: #557c3a;
}
.step-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
}
.step-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.step-connect {
  display: none;
}
@media (max-width: 768px) {
  .flow-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

/* Scenario / Left-Right */
.scenario-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.scenario-text h2 {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 12px;
}
.scenario-text > p {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}
.scenario-list {
  list-style: none;
  margin-bottom: 28px;
}
.scenario-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 14px;
  font-size: 15px;
  color: var(--text);
  line-height: 1.7;
}
.scenario-list li::before {
  content: "\f00c";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  position: absolute;
  left: 0;
  top: 1px;
  color: var(--accent);
  font-size: 14px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(232, 134, 45, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
}
.scenario-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.scenario-media img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}
.scenario-media .media-badge {
  position: absolute;
  left: 20px;
  bottom: 20px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(4px);
  border-radius: var(--radius-md);
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary-dark);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 8px;
}
.scenario-media .media-badge i {
  color: var(--accent);
}
@media (max-width: 768px) {
  .scenario-wrap {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .scenario-text h2 {
    font-size: 26px;
  }
}

/* Troubleshoot */
.troubleshoot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.trouble-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  gap: 18px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.trouble-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.trouble-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(58, 123, 191, 0.1);
  color: var(--primary);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.trouble-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}
.trouble-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.trouble-card .trouble-tip {
  margin-top: 8px;
  font-size: 13px;
  color: var(--primary-dark);
  background: rgba(58, 123, 191, 0.06);
  border-radius: 8px;
  padding: 8px 12px;
  display: inline-block;
}
@media (max-width: 768px) {
  .troubleshoot-grid {
    grid-template-columns: 1fr;
  }
}

/* FAQ */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}
.faq-item:hover {
  box-shadow: var(--shadow-md);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 26px;
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  color: var(--text);
  transition: background 0.2s ease;
}
.faq-question:hover {
  background: rgba(58, 123, 191, 0.03);
}
.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(58, 123, 191, 0.1);
  color: var(--primary);
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 0.3s ease, background 0.3s ease, color 0.3s ease;
}
.faq-item.open .faq-icon {
  transform: rotate(45deg);
  background: var(--primary);
  color: #fff;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.3s ease;
  border-top: 1px solid transparent;
}
.faq-item.open .faq-answer {
  max-height: 320px;
  border-top-color: var(--border);
  padding: 0 26px 22px;
}
.faq-answer-inner {
  padding-top: 18px;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.75;
}
.faq-answer-inner ul {
  padding-left: 18px;
  margin-top: 8px;
}
.faq-answer-inner li {
  margin-bottom: 4px;
}
@media (max-width: 520px) {
  .faq-question {
    padding: 18px;
    font-size: 15px;
  }
  .faq-item.open .faq-answer {
    padding: 0 18px 18px;
  }
}

/* CTA Section */
.cta-section {
  background: var(--footer-bg);
  border-radius: 24px;
  margin: var(--space) 0;
  padding: 60px 48px;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(58, 123, 191, 0.2);
  filter: blur(40px);
}
.cta-inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.cta-text h2 {
  font-size: 30px;
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 10px;
}
.cta-text p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.75);
  max-width: 480px;
}
.cta-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
@media (max-width: 768px) {
  .cta-section {
    padding: 44px 28px;
    margin: 56px 0;
  }
  .cta-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Footer */
.site-footer {
  background: var(--footer-bg);
  padding: 64px 0 24px;
  margin-top: var(--space);
  color: rgba(255, 255, 255, 0.8);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.footer-brand .brand {
  margin-bottom: 16px;
}
.footer-brand .brand-text {
  color: #fff;
}
.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
  max-width: 260px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 18px;
}
.footer-col ul {
  list-style: none;
}
.footer-col li {
  margin-bottom: 10px;
}
.footer-col li a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  transition: color 0.2s ease;
}
.footer-col li a:hover {
  color: #fff;
}
.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
}
.footer-contact li i {
  color: var(--accent);
  width: 18px;
  text-align: center;
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  flex-wrap: wrap;
}
.footer-bottom a {
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.2s ease;
}
.footer-bottom a:hover {
  color: #fff;
}
@media (max-width: 960px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 520px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(31, 42, 55, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}
.modal-card {
  background: #fff;
  border-radius: var(--radius-lg);
  width: 480px;
  max-width: 100%;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  padding: 36px;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.97);
  transition: transform 0.3s ease;
}
.modal-overlay.open .modal-card {
  transform: translateY(0) scale(1);
}
.modal-card .modal-close {
  float: right;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg);
  color: var(--text-secondary);
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, color 0.2s ease;
}
.modal-card .modal-close:hover {
  background: rgba(217, 83, 79, 0.1);
  color: #d9534f;
}
.modal-card h3 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 8px;
  clear: both;
}
.modal-card .modal-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}
.form-group .error-msg {
  font-size: 12px;
  color: #d9534f;
  display: none;
  margin-top: 4px;
}
.form-group.has-error .error-msg {
  display: block;
}
.form-group.has-error input,
.form-group.has-error textarea {
  border-color: #d9534f;
  box-shadow: 0 0 0 2px rgba(217, 83, 79, 0.12);
}
.modal-submit {
  width: 100%;
  margin-top: 8px;
}
.privacy-note {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-top: 16px;
  text-align: center;
}
.modal-success {
  display: none;
  text-align: center;
  padding: 40px 0;
}
.modal-success.show {
  display: block;
}
.modal-success i {
  font-size: 52px;
  color: #6c9a4f;
  display: block;
  margin-bottom: 16px;
}
.modal-success h4 {
  font-size: 22px;
  margin-bottom: 8px;
}
.modal-success p {
  font-size: 14px;
  color: var(--text-secondary);
}
@media (max-width: 520px) {
  .modal-overlay {
    align-items: flex-end;
    padding: 0;
  }
  .modal-card {
    width: 100%;
    border-radius: 20px 20px 0 0;
    max-height: 92vh;
    padding: 28px 24px 32px;
    transform: translateY(100%);
    transition: transform 0.3s ease;
  }
  .modal-overlay.open .modal-card {
    transform: translateY(0);
  }
}

/* roulang page: article */
:root {
  --primary: #3A7BBF;
  --primary-dark: #1F5A8E;
  --primary-light: #EDF3FA;
  --accent: #E8862D;
  --accent-dark: #D9761F;
  --bg: #F7F8FA;
  --text: #1F2A37;
  --muted: #5B6B7C;
  --border: #E5E9F0;
  --footer-bg: #1F2A44;
  --footer-text: #A9BCD0;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 8px;
  --shadow: 0 4px 16px rgba(31, 58, 88, 0.04), 0 2px 6px rgba(31, 58, 88, 0.06);
  --shadow-hover: 0 12px 32px rgba(31, 58, 88, 0.08), 0 4px 12px rgba(31, 58, 88, 0.1);
  --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", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--primary-dark);
}

button {
  font-family: inherit;
}

input, textarea {
  font-family: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header / Nav Panel ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 16px 0 8px;
  background: linear-gradient(to bottom, rgba(247, 248, 250, 0.95), rgba(247, 248, 250, 0.88));
  backdrop-filter: blur(12px);
}

.nav-panel {
  display: flex;
  align-items: center;
  gap: 20px;
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 14px 22px;
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-logo {
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: #FFFFFF;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(58, 123, 191, 0.3);
}

.brand-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  justify-content: center;
}

.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 12px;
  color: var(--muted);
  font-weight: 500;
  font-size: 15px;
  border: 1px solid transparent;
  transition: all var(--transition);
}

.nav-item i {
  font-size: 14px;
  color: var(--primary);
  opacity: 0.7;
  transition: opacity var(--transition);
}

.nav-item:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(58, 123, 191, 0.1);
}

.nav-item:hover i {
  opacity: 1;
}

.nav-item.active {
  background: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 6px 16px rgba(58, 123, 191, 0.28);
}

.nav-item.active i {
  color: #FFFFFF;
  opacity: 1;
}

.nav-item:focus-visible {
  outline: 2px solid rgba(58, 123, 191, 0.5);
  outline-offset: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 26px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid rgba(58, 123, 191, 0.5);
  outline-offset: 2px;
}

.btn-sm {
  height: 40px;
  padding: 0 18px;
  font-size: 14px;
}

.btn-lg {
  height: 52px;
  padding: 0 34px;
  font-size: 16px;
}

.btn-accent {
  background: var(--accent);
  color: #FFFFFF;
  box-shadow: 0 6px 16px rgba(232, 134, 45, 0.28);
}

.btn-accent:hover {
  background: var(--accent-dark);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(232, 134, 45, 0.32);
}

.btn-accent:active {
  transform: translateY(0);
  box-shadow: 0 4px 10px rgba(232, 134, 45, 0.2);
}

.btn-outline {
  background: #FFFFFF;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  background: var(--primary-light);
  border: none;
  border-radius: var(--radius-md);
  font-size: 18px;
  color: var(--text);
  cursor: pointer;
  margin-left: auto;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.nav-toggle:hover {
  background: var(--primary);
  color: #FFFFFF;
}

.mobile-nav {
  display: none;
  margin-top: 12px;
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 18px;
  box-shadow: var(--shadow-hover);
}

.mobile-nav.open {
  display: block;
}

.mobile-nav .main-nav {
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
}

.mobile-nav .nav-item {
  padding: 13px 16px;
  width: 100%;
  font-size: 15px;
}

.mobile-nav .header-actions {
  margin-top: 14px;
}

.mobile-nav .header-actions .btn {
  width: 100%;
}

/* ===== Breadcrumb ===== */
.breadcrumb-bar {
  padding: 36px 0 8px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
}

.breadcrumb a {
  color: var(--primary);
  padding: 2px 0;
}

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

.breadcrumb .divider {
  color: #B7C3D1;
  font-size: 12px;
}

.breadcrumb .current {
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 360px;
  display: inline-block;
  vertical-align: bottom;
}

/* ===== Article Header ===== */
.article-header {
  padding: 20px 0 16px;
}

.cat-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 100px;
  letter-spacing: 0.2px;
}

.article-header h1 {
  font-size: 38px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--text);
  margin: 16px 0 14px;
  max-width: 860px;
  letter-spacing: -0.2px;
}

.article-summary {
  font-size: 17px;
  color: var(--muted);
  line-height: 1.75;
  max-width: 780px;
  margin-bottom: 24px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  color: var(--muted);
  font-size: 14px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.meta-item i {
  color: var(--primary);
  opacity: 0.6;
}

/* ===== Article Cover ===== */
.article-cover {
  padding: 28px 0 8px;
}

.article-cover .cover-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 16 / 7;
  box-shadow: var(--shadow);
  background: var(--primary-light);
  min-height: 260px;
}

.article-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ===== Article Body ===== */
.article-layout {
  padding: 32px 0 16px;
}

.article-body {
  max-width: 72ch;
  margin: 0 auto;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.article-body p {
  margin: 0 0 18px;
}

.article-body h2 {
  font-size: 26px;
  line-height: 1.4;
  margin: 44px 0 16px;
  padding-left: 14px;
  border-left: 3px solid var(--primary);
  font-weight: 700;
}

.article-body h3 {
  font-size: 21px;
  line-height: 1.45;
  margin: 34px 0 12px;
  font-weight: 600;
  color: var(--primary-dark);
}

.article-body h4 {
  font-size: 18px;
  line-height: 1.5;
  margin: 26px 0 10px;
  font-weight: 600;
}

.article-body ul,
.article-body ol {
  margin: 0 0 20px;
  padding-left: 26px;
}

.article-body li {
  margin-bottom: 8px;
  line-height: 1.75;
}

.article-body ul li::marker {
  color: var(--primary);
}

.article-body a {
  color: var(--primary);
  border-bottom: 1px solid rgba(58, 123, 191, 0.3);
  padding-bottom: 1px;
}

.article-body a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.article-body blockquote {
  margin: 24px 0;
  padding: 18px 24px;
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text);
  font-size: 15px;
}

.article-body blockquote p {
  margin: 0;
}

.article-body img {
  border-radius: 12px;
  margin: 24px 0;
  box-shadow: var(--shadow);
}

.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(--primary-light);
  color: var(--primary-dark);
  font-weight: 600;
}

.article-body pre {
  background: var(--footer-bg);
  color: #E5E9F0;
  padding: 18px 20px;
  border-radius: 12px;
  overflow-x: auto;
  margin: 24px 0;
  font-size: 14px;
  line-height: 1.7;
}

.article-body code {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 2px 7px;
  border-radius: 6px;
  font-size: 0.9em;
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
}

.article-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

/* ===== Related Section ===== */
.related-section {
  padding: 72px 0 48px;
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 44px;
}

.section-title {
  font-size: 30px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
  letter-spacing: -0.2px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--muted);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.related-card {
  display: flex;
  flex-direction: column;
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid transparent;
  transition: all var(--transition);
  color: var(--text);
}

.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(58, 123, 191, 0.15);
  color: var(--text);
}

.related-card .cat-badge {
  align-self: flex-start;
  margin-bottom: 14px;
}

.related-card h3 {
  font-size: 18px;
  line-height: 1.5;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.related-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 18px;
  flex: 1;
}

.related-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}

.related-card:hover .related-link {
  color: var(--accent);
}

.related-link i {
  transition: transform var(--transition);
}

.related-card:hover .related-link i {
  transform: translateX(3px);
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 32px 0 80px;
}

.cta-box {
  background: linear-gradient(135deg, rgba(31, 42, 68, 0.92), rgba(31, 90, 142, 0.88)), url('/assets/images/backpic/back-2.webp') center / cover;
  border-radius: 20px;
  padding: 52px 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  color: #FFFFFF;
  box-shadow: 0 16px 40px rgba(31, 58, 88, 0.18);
  min-height: 220px;
}

.cta-content h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 10px;
}

.cta-content p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
}

.cta-box .btn-accent {
  flex-shrink: 0;
}

/* ===== Not Found ===== */
.not-found-section {
  padding: 80px 0 120px;
  min-height: 50vh;
}

.not-found-panel {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  max-width: 560px;
  margin: 0 auto;
  padding: 64px 40px;
  text-align: center;
  box-shadow: var(--shadow);
}

.not-found-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin: 0 auto 20px;
}

.not-found-panel h2 {
  font-size: 24px;
  margin-bottom: 12px;
}

.not-found-panel p {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 28px;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 68px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 44px;
  padding-bottom: 44px;
}

.footer-brand .brand-text {
  color: #FFFFFF;
}

.footer-brand .brand-logo {
  background: var(--accent);
  box-shadow: 0 4px 12px rgba(232, 134, 45, 0.3);
}

.footer-desc {
  font-size: 14px;
  line-height: 1.75;
  color: #8CA3BC;
  margin-top: 18px;
  max-width: 300px;
}

.footer-col h4 {
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 18px;
  letter-spacing: 0.3px;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li {
  margin-bottom: 12px;
}

.footer-col a {
  color: var(--footer-text);
  font-size: 14px;
  text-decoration: none;
  transition: all var(--transition);
}

.footer-col a:hover {
  color: #FFFFFF;
  padding-left: 4px;
}

.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--footer-text);
}

.footer-contact i {
  color: var(--primary);
  width: 16px;
  text-align: center;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
  color: #8CA3BC;
}

.footer-bottom a {
  color: var(--footer-text);
  text-decoration: none;
}

.footer-bottom a:hover {
  color: #FFFFFF;
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(31, 42, 55, 0.55);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal-overlay.open {
  display: flex;
}

.modal-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  width: 480px;
  max-width: 100%;
  padding: 38px 36px 32px;
  box-shadow: 0 24px 60px rgba(31, 42, 55, 0.25);
  position: relative;
  animation: modalIn 0.25s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--primary-light);
  border: none;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  font-size: 15px;
  color: var(--muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.modal-close:hover {
  background: var(--primary);
  color: #FFFFFF;
}

.modal-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
}

.modal-card > p {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0 14px;
  font-size: 15px;
  color: var(--text);
  background: #FFFFFF;
  transition: all var(--transition);
}

.form-group textarea {
  height: 96px;
  padding: 12px 14px;
  resize: vertical;
  line-height: 1.5;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(58, 123, 191, 0.15);
}

.form-group input.error,
.form-group textarea.error {
  border-color: #D9534F;
}

.form-error-msg,
.form-success {
  font-size: 13px;
  margin-top: 8px;
  display: none;
}

.form-error-msg {
  color: #D9534F;
}

.form-success {
  color: var(--primary-dark);
  font-weight: 600;
}

.privacy-note {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
  margin-top: 16px;
  text-align: center;
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .desktop-nav,
  .desktop-cta {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-panel {
    flex-wrap: wrap;
  }

  .mobile-nav {
    display: none;
  }

  .mobile-nav.open {
    display: block;
  }
}

@media (min-width: 961px) {
  .mobile-nav {
    display: none !important;
  }

  .nav-toggle {
    display: none !important;
  }
}

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

  .nav-panel {
    padding: 12px 16px;
    gap: 12px;
  }

  .brand-text {
    font-size: 18px;
  }

  .article-header h1 {
    font-size: 30px;
    line-height: 1.4;
  }

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

  .article-cover .cover-wrap {
    aspect-ratio: 16 / 10;
    min-height: 200px;
  }

  .related-grid {
    grid-template-columns: 1fr;
  }

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

  .cta-box {
    flex-direction: column;
    padding: 40px 28px;
    text-align: center;
    gap: 24px;
  }

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

  .cta-box .btn-accent {
    width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px 28px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .breadcrumb .current {
    max-width: 200px;
  }

  .modal-card {
    padding: 30px 24px 26px;
  }
}

@media (max-width: 520px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .brand-logo {
    width: 36px;
    height: 36px;
    font-size: 13px;
  }

  .brand-text {
    font-size: 17px;
  }

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

  .article-meta {
    gap: 14px;
    font-size: 13px;
  }

  .related-card {
    padding: 22px;
  }

  .cta-box {
    padding: 32px 22px;
  }

  .breadcrumb {
    font-size: 13px;
  }

  .breadcrumb .current {
    max-width: 140px;
  }
}

/* roulang page: category2 */
:root {
            --primary: #3A7BBF;
            --primary-dark: #1F5A8E;
            --primary-light: #EAF2FA;
            --accent: #E8862D;
            --accent-dark: #C96F1D;
            --bg: #F7F8FA;
            --card-bg: #FFFFFF;
            --text: #1F2A37;
            --text-light: #5B6B7C;
            --border: #E5E9F0;
            --footer-bg: #1F2A44;
            --radius-lg: 16px;
            --radius-md: 10px;
            --radius-sm: 8px;
            --shadow-sm: 0 2px 8px rgba(31, 42, 55, 0.04), 0 4px 16px rgba(31, 42, 55, 0.04);
            --shadow-lg: 0 6px 24px rgba(31, 42, 55, 0.08), 0 12px 40px rgba(31, 42, 55, 0.06);
            --transition: 0.2s ease;
            --container-max: 1200px;
        }

        *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

        html { scroll-behavior: smooth; }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: var(--text);
            background: var(--bg);
            overflow-x: hidden;
        }

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

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

        ul, ol { list-style: none; }

        button, input, select, textarea { font-family: inherit; font-size: 100%; border: none; outline: none; }

        .container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }

        a:focus-visible, button:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
        }

        /* ========== Header / Nav ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            padding: 16px 0 8px;
            background: transparent;
        }

        .site-header .container { position: relative; }

        .nav-panel {
            display: flex;
            align-items: center;
            gap: 20px;
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: 12px 20px;
            border: 1px solid rgba(229, 233, 240, 0.6);
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .brand-logo {
            width: 42px;
            height: 42px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 800;
            letter-spacing: 0.5px;
            box-shadow: 0 4px 12px rgba(58, 123, 191, 0.25);
        }

        .brand-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
            letter-spacing: 0.3px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
            margin-left: auto;
        }

        .nav-item {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 16px;
            border-radius: var(--radius-md);
            font-size: 15px;
            font-weight: 600;
            color: var(--text-light);
            transition: background var(--transition), color var(--transition), box-shadow var(--transition);
            white-space: nowrap;
        }

        .nav-item i { font-size: 14px; }

        .nav-item:hover { background: var(--primary-light); color: var(--primary-dark); }

        .nav-item.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(58, 123, 191, 0.28);
        }

        .header-actions { margin-left: 4px; }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: background var(--transition), box-shadow var(--transition), transform var(--transition), opacity var(--transition);
            border: 2px solid transparent;
            line-height: 1;
        }

        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 16px rgba(232, 134, 45, 0.3);
        }

        .btn-primary:hover { background: var(--accent-dark); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(232, 134, 45, 0.35); }

        .btn-primary:active { transform: translateY(0); box-shadow: 0 2px 8px rgba(232, 134, 45, 0.3); }

        .btn-primary:disabled { opacity: 0.5; box-shadow: none; cursor: not-allowed; transform: none; }

        .btn-primary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; box-shadow: 0 0 0 4px rgba(232, 134, 45, 0.18); }

        .btn-outline {
            background: transparent;
            color: var(--primary-dark);
            border: 2px solid var(--primary);
        }

        .btn-outline:hover { background: var(--primary-light); transform: translateY(-1px); }

        .btn-outline:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; box-shadow: 0 0 0 4px rgba(58, 123, 191, 0.15); }

        .btn-sm { padding: 10px 18px; font-size: 14px; }

        .nav-toggle {
            display: none;
            background: transparent;
            font-size: 22px;
            color: var(--text);
            cursor: pointer;
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }

        .nav-toggle:hover { background: var(--primary-light); }

        .mobile-nav { display: none; }

        /* ========== Page Hero ========== */
        .page-hero {
            position: relative;
            padding: 96px 0 88px;
            background-color: var(--bg);
        }

        .page-hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            z-index: 0;
        }

        .page-hero-bg::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(255, 255, 255, 0.78);
        }

        .page-hero .container { position: relative; z-index: 1; }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }

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

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

        .breadcrumb span { color: var(--text-light); }

        .breadcrumb .current { color: var(--text); font-weight: 600; }

        .page-hero h1 {
            font-size: 44px;
            line-height: 1.25;
            font-weight: 800;
            color: var(--text);
            max-width: 720px;
            letter-spacing: -0.5px;
        }

        .page-hero h1 .highlight { color: var(--primary); }

        .page-hero .lead {
            font-size: 18px;
            color: var(--text-light);
            max-width: 640px;
            margin-top: 16px;
            line-height: 1.8;
        }

        .page-hero .hero-badges {
            display: flex;
            gap: 12px;
            margin-top: 28px;
            flex-wrap: wrap;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 100px;
            padding: 6px 16px;
            font-size: 13px;
            font-weight: 600;
            color: var(--text-light);
            box-shadow: var(--shadow-sm);
        }

        .badge i { color: var(--primary); }

        .badge-accent { background: rgba(232, 134, 45, 0.1); border-color: rgba(232, 134, 45, 0.2); color: var(--accent-dark); }

        .badge-accent i { color: var(--accent); }

        /* ========== Feature Highlight Section ========== */
        .feature-section { padding: 88px 0; }

        .feature-section-alt { background: var(--card-bg); }

        .section-header {
            max-width: 720px;
            margin-bottom: 48px;
        }

        .section-header.section-center { margin-left: auto; margin-right: auto; text-align: center; }

        .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 1px;
            color: var(--primary);
            background: var(--primary-light);
            padding: 4px 14px;
            border-radius: 100px;
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        .section-header h2 {
            font-size: 32px;
            line-height: 1.3;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }

        .section-header p {
            font-size: 16px;
            color: var(--text-light);
            line-height: 1.7;
        }

        .masonry-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .feature-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: 32px 28px;
            transition: transform var(--transition), box-shadow var(--transition);
            position: relative;
            overflow: hidden;
            border: 1px solid rgba(229, 233, 240, 0.5);
        }

        .feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

        .feature-card.span-2 { grid-column: span 2; }

        .feature-card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 20px;
        }

        .feature-card .card-icon.accent { background: rgba(232, 134, 45, 0.12); color: var(--accent); }

        .feature-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 10px;
        }

        .feature-card p {
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .feature-card ul { margin-top: 4px; }

        .feature-card ul li {
            font-size: 14px;
            color: var(--text-light);
            padding: 4px 0;
            display: flex;
            align-items: flex-start;
            gap: 8px;
        }

        .feature-card ul li i { color: var(--primary); font-size: 12px; margin-top: 5px; }

        .feature-card .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 8px;
            transition: gap var(--transition);
        }

        .feature-card .card-link:hover { gap: 10px; color: var(--primary-dark); }

        /* ========== Split Feature Block ========== */
        .split-section { padding: 96px 0; }

        .split-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 64px;
            align-items: center;
        }

        .split-media img {
            width: 100%;
            height: 380px;
            object-fit: cover;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
        }

        .split-content h2 {
            font-size: 30px;
            font-weight: 800;
            line-height: 1.35;
            color: var(--text);
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }

        .split-content p {
            color: var(--text-light);
            font-size: 16px;
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .split-points { margin-top: 24px; }

        .split-points li {
            display: flex;
            gap: 12px;
            align-items: flex-start;
            padding: 10px 0;
            border-bottom: 1px solid var(--border);
        }

        .split-points li:last-child { border-bottom: none; }

        .split-points .point-icon {
            width: 32px;
            height: 32px;
            flex-shrink: 0;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            margin-top: 2px;
        }

        .split-points .point-text strong { display: block; font-size: 16px; color: var(--text); }

        .split-points .point-text span { font-size: 14px; color: var(--text-light); }

        .split-media-wrapper {
            position: relative;
        }

        .split-media-wrapper::before {
            content: '';
            position: absolute;
            top: -20px;
            right: -20px;
            width: 160px;
            height: 160px;
            background: var(--primary-light);
            border-radius: var(--radius-lg);
            z-index: -1;
        }

        /* ========== Stats Section ========== */
        .stats-section {
            padding: 88px 0;
            background: var(--card-bg);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .stats-card {
            background: var(--bg);
            border-radius: var(--radius-lg);
            padding: 40px 32px;
            text-align: left;
            border: 1px solid var(--border);
            transition: box-shadow var(--transition), transform var(--transition);
        }

        .stats-card:hover { box-shadow: var(--shadow-sm); transform: translateY(-2px); }

        .stats-number {
            font-size: 44px;
            font-weight: 900;
            color: var(--accent);
            letter-spacing: -1px;
            line-height: 1.2;
        }

        .stats-number .unit { font-size: 20px; font-weight: 700; margin-left: 4px; }

        .stats-label {
            font-size: 15px;
            color: var(--text-light);
            margin-top: 10px;
        }

        .stats-detail {
            font-size: 14px;
            color: var(--text-light);
            margin-top: 6px;
            line-height: 1.6;
        }

        /* ========== FAQ Section ========== */
        .faq-section { padding: 96px 0; }

        .faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }

        .faq-item {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            border: 1px solid rgba(229, 233, 240, 0.5);
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            padding: 22px 28px;
            font-size: 17px;
            font-weight: 700;
            color: var(--text);
            cursor: pointer;
            transition: background var(--transition);
        }

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

        .faq-question .faq-icon {
            width: 28px;
            height: 28px;
            flex-shrink: 0;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            transition: transform var(--transition), background var(--transition), color var(--transition);
        }

        .faq-item.open .faq-icon { transform: rotate(45deg); background: var(--primary); color: #fff; }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            border-top: 1px solid transparent;
        }

        .faq-item.open .faq-answer { max-height: 400px; border-top-color: var(--border); }

        .faq-answer-inner { padding: 18px 28px 24px; font-size: 15px; color: var(--text-light); line-height: 1.8; }

        .faq-answer-inner ul { margin-top: 8px; }

        .faq-answer-inner li { list-style: disc; margin-left: 20px; padding: 2px 0; }

        /* ========== CTA Section ========== */
        .cta-section { padding: 96px 0; }

        .cta-card {
            background: var(--footer-bg);
            border-radius: var(--radius-lg);
            padding: 64px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-card::before {
            content: '';
            position: absolute;
            top: -40px;
            right: -40px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(58, 123, 191, 0.2);
        }

        .cta-card::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -20px;
            width: 140px;
            height: 140px;
            border-radius: 50%;
            background: rgba(232, 134, 45, 0.15);
        }

        .cta-card h2 {
            font-size: 32px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }

        .cta-card p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.8);
            max-width: 520px;
            margin: 0 auto 28px;
            position: relative;
            z-index: 1;
        }

        .cta-card .btn { position: relative; z-index: 1; }

        .cta-card .btn-outline { border-color: rgba(255, 255, 255, 0.6); color: #fff; }

        .cta-card .btn-outline:hover { background: rgba(255, 255, 255, 0.1); }

        /* ========== Modal ========== */
        .modal-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(31, 42, 55, 0.5);
            z-index: 1000;
            align-items: center;
            justify-content: center;
        }

        .modal-overlay.show { display: flex; }

        .modal-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            width: 480px;
            max-width: calc(100vw - 32px);
            padding: 40px;
            box-shadow: var(--shadow-lg);
            animation: modalIn 0.25s ease;
        }

        @keyframes modalIn {
            from { opacity: 0; transform: translateY(20px) scale(0.96); }
            to { opacity: 1; transform: translateY(0) scale(1); }
        }

        .modal-card h3 {
            font-size: 24px;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 6px;
        }

        .modal-card .modal-sub { font-size: 14px; color: var(--text-light); margin-bottom: 24px; }

        .form-group { margin-bottom: 18px; }

        .form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--text); }

        .form-control {
            width: 100%;
            height: 44px;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 0 14px;
            font-size: 15px;
            background: var(--bg);
            transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(58, 123, 191, 0.12);
            background: #fff;
        }

        .form-control.error { border-color: #E5484D; box-shadow: 0 0 0 3px rgba(229, 72, 77, 0.1); }

        textarea.form-control { height: auto; padding: 12px 14px; resize: vertical; min-height: 88px; }

        .form-hint { font-size: 12px; color: var(--text-light); margin-top: 4px; }

        .form-submit { width: 100%; margin-top: 8px; }

        .privacy-note {
            font-size: 12px;
            color: var(--text-light);
            text-align: center;
            margin-top: 16px;
            line-height: 1.6;
        }

        .modal-close {
            position: absolute;
            top: 16px;
            right: 16px;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--bg);
            color: var(--text-light);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 14px;
            transition: background var(--transition), color var(--transition);
        }

        .modal-close:hover { background: var(--primary-light); color: var(--primary); }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--footer-bg);
            color: rgba(255, 255, 255, 0.85);
            padding: 72px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 48px;
            padding-bottom: 56px;
        }

        .footer-brand .brand-text { color: #fff; }

        .footer-brand .brand-logo { background: var(--accent); box-shadow: 0 4px 12px rgba(232, 134, 45, 0.3); }

        .footer-desc {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 16px;
            line-height: 1.7;
            max-width: 280px;
        }

        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 20px;
        }

        .footer-col ul li { margin-bottom: 10px; }

        .footer-col ul a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.65);
            transition: color var(--transition), padding-left var(--transition);
        }

        .footer-col ul a:hover { color: var(--accent); padding-left: 4px; }

        .footer-col ul li i { width: 18px; color: var(--accent); margin-right: 6px; }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 24px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
            gap: 16px;
            flex-wrap: wrap;
        }

        .footer-bottom a { color: rgba(255, 255, 255, 0.5); }

        .footer-bottom a:hover { color: var(--accent); }

        /* ========== Back to Top ========== */
        .back-to-top {
            position: fixed;
            right: 24px;
            bottom: 24px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            box-shadow: 0 4px 16px rgba(58, 123, 191, 0.35);
            cursor: pointer;
            z-index: 50;
            opacity: 0;
            visibility: hidden;
            transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
            border: none;
        }

        .back-to-top.show { opacity: 1; visibility: visible; }

        .back-to-top:hover { transform: translateY(-3px); background: var(--primary-dark); }

        /* ========== Responsive ========== */
        @media (max-width: 960px) {
            .nav-panel .main-nav, .nav-panel .header-actions { display: none; }
            .nav-toggle { display: inline-flex; align-items: center; justify-content: center; margin-left: auto; }

            .mobile-nav {
                display: none;
                position: absolute;
                top: calc(100% + 8px);
                left: 24px;
                right: 24px;
                background: var(--card-bg);
                border-radius: var(--radius-lg);
                box-shadow: var(--shadow-lg);
                padding: 20px;
                border: 1px solid var(--border);
            }

            .mobile-nav.show { display: block; }

            .mobile-nav .main-nav { display: flex; flex-direction: column; align-items: stretch; gap: 6px; }

            .mobile-nav .nav-item { display: flex; align-items: center; padding: 12px 16px; }

            .mobile-nav .header-actions { margin: 16px 0 0; }

            .mobile-nav .header-actions .btn { width: 100%; }

            .masonry-grid { grid-template-columns: 1fr 1fr; }

            .feature-card.span-2 { grid-column: span 2; }

            .stats-grid { grid-template-columns: 1fr 1fr; }

            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 767px) {
            body { font-size: 15px; }

            .container { padding: 0 16px; }

            .page-hero { padding: 64px 0 56px; }

            .page-hero h1 { font-size: 30px; line-height: 1.35; }

            .page-hero .lead { font-size: 16px; }

            .masonry-grid { grid-template-columns: 1fr; }

            .feature-card.span-2 { grid-column: span 1; }

            .split-grid { grid-template-columns: 1fr; gap: 32px; }

            .split-media img { height: 240px; }

            .stats-grid { grid-template-columns: 1fr; }

            .stats-card { padding: 28px 24px; }

            .stats-number { font-size: 36px; }

            .faq-question { padding: 18px 20px; font-size: 16px; }

            .cta-card { padding: 40px 24px; }

            .cta-card h2 { font-size: 26px; }

            .footer-grid { grid-template-columns: 1fr; gap: 32px; padding-bottom: 32px; }

            .footer-bottom { flex-direction: column; text-align: center; }

            .modal-card { padding: 32px 24px; width: 100%; max-width: calc(100vw - 24px); }

            .btn { padding: 11px 20px; font-size: 14px; }

            .form-submit { margin-top: 4px; }

            .back-to-top { right: 16px; bottom: 16px; }
        }

        @media (max-width: 520px) {
            .brand-text { font-size: 17px; }

            .brand-logo { width: 36px; height: 36px; font-size: 16px; }

            .nav-panel { padding: 10px 12px; gap: 10px; }

            .page-hero h1 { font-size: 26px; }

            .section-header h2 { font-size: 26px; }

            .split-content h2 { font-size: 24px; }

            .cta-card h2 { font-size: 22px; }

            .section-tag { font-size: 12px; }
        }