/* roulang page: index */
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #dbeafe;
  --accent: #06b6d4;
  --accent-light: #cffafe;
  --success: #10b981;
  --warning: #f59e0b;
  --bg: #f1f5f9;
  --bg-white: #ffffff;
  --bg-dark: #0f172a;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.05);
  --shadow: 0 8px 28px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.12);
  --transition: all .3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

input {
  font-family: inherit;
}

a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 3px solid rgba(6, 182, 212, 0.45);
  outline-offset: 2px;
}

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

.section {
  padding: 96px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header .section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
  letter-spacing: .5px;
}

.section-header h2 {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 12px;
  color: var(--text);
  letter-spacing: -1px;
}

.section-header p {
  max-width: 600px;
  margin: 0 auto;
  color: var(--text-muted);
  font-size: 17px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.04);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 20px;
}

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

.brand-icon {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: 12px;
  font-size: 17px;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.brand-name {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.nav-channels {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0 auto;
}

.nav-channels .nav-link {
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
  white-space: nowrap;
}

.nav-channels .nav-link:hover {
  background: var(--bg);
  color: var(--text);
}

.nav-channels .nav-link.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

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

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg);
  border: 1px solid transparent;
  border-radius: 100px;
  padding: 6px 6px 6px 16px;
  transition: var(--transition);
  width: 200px;
}

.search-box:focus-within {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.08);
}

.search-box input {
  border: none;
  outline: none;
  background: transparent;
  font-size: 14px;
  color: var(--text);
  width: 100%;
}

.search-box input::placeholder {
  color: #94a3b8;
}

.search-box button {
  background: var(--primary);
  color: #fff;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: var(--transition);
  flex-shrink: 0;
}

.search-box button:hover {
  background: var(--primary-dark);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
  line-height: 1.4;
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn-login {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-login:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.28);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.36);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(6px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 17px;
  border-radius: 14px;
}

.mobile-toggle {
  display: none;
  font-size: 22px;
  color: var(--text);
  width: 42px;
  height: 42px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  transition: var(--transition);
}

.mobile-toggle:hover {
  background: var(--border);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 76px;
  left: 0;
  right: 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  padding: 16px 24px 24px;
  z-index: 999;
  flex-direction: column;
  gap: 4px;
}

.mobile-menu.open {
  display: flex;
}

.mobile-link {
  padding: 14px 12px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  transition: var(--transition);
}

.mobile-link:hover {
  background: var(--bg);
}

.mobile-link.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
}

.mobile-actions {
  display: flex;
  gap: 12px;
  margin-top: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.mobile-actions .btn {
  flex: 1;
}

.hero {
  position: relative;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  padding: 140px 0 110px;
  color: #fff;
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(37, 99, 235, 0.78) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 28px;
  letter-spacing: .5px;
  color: #e0f2fe;
}

.hero h1 {
  font-size: 52px;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 19px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.9);
  max-width: 620px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat strong {
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.stat span {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
}

.features {
  background: var(--bg-white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 54px;
  height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  font-size: 22px;
  margin-bottom: 22px;
}

.feature-icon.blue {
  background: var(--primary-light);
  color: var(--primary);
}

.feature-icon.cyan {
  background: var(--accent-light);
  color: var(--accent);
}

.feature-icon.green {
  background: #d1fae5;
  color: #059669;
}

.feature-icon.orange {
  background: #fef3c7;
  color: #d97706;
}

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

.feature-card p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.75;
}

.platform {
  background: var(--bg);
}

.platform-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.platform-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.platform-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 360px;
}

.platform-badge {
  position: absolute;
  bottom: 20px;
  left: 20px;
  right: 20px;
  background: rgba(15, 23, 42, 0.78);
  backdrop-filter: blur(10px);
  border-radius: var(--radius);
  padding: 14px 20px;
  color: #fff;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.platform-content h2 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
  color: var(--text);
}

.platform-content .lead {
  font-size: 17px;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.8;
}

.platform-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.platform-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.platform-list li:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.platform-list i {
  color: var(--primary);
  font-size: 18px;
  margin-top: 3px;
  flex-shrink: 0;
}

.platform-list strong {
  display: block;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 2px;
  color: var(--text);
}

.platform-list span {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

.process {
  background: var(--bg-white);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-top: 20px;
}

.step {
  position: relative;
  text-align: center;
  padding: 40px 30px;
  background: var(--bg);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  overflow: hidden;
}

.step:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  background: #fff;
}

.step-num {
  width: 54px;
  height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 24px;
  font-weight: 800;
  border-radius: 50%;
  margin-bottom: 22px;
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
}

.step h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.step p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
}

.step-arrow {
  position: absolute;
  top: 50%;
  right: -28px;
  transform: translateY(-50%);
  color: var(--border);
  font-size: 28px;
  z-index: 2;
}

.category-entry {
  background: var(--bg);
}

.category-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  max-width: 1000px;
  margin: 0 auto;
}

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

.category-media {
  position: relative;
  min-height: 340px;
  overflow: hidden;
}

.category-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
  transition: transform .5s ease;
}

.category-card:hover .category-media img {
  transform: scale(1.05);
}

.category-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.2), transparent 60%);
}

.category-body {
  padding: 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
}

.category-body .section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 100px;
  width: fit-content;
}

.category-body h3 {
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
}

.category-body p {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.75;
}

.category-body .btn {
  align-self: flex-start;
  margin-top: 8px;
}

.news {
  background: var(--bg-white);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.news-item {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.news-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.news-cover {
  position: relative;
  height: 210px;
  overflow: hidden;
}

.news-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}

.news-item:hover .news-cover img {
  transform: scale(1.06);
}

.news-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(8px);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 100px;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.news-content {
  padding: 24px;
}

.news-content h3 {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 10px;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-content h3 a:hover {
  color: var(--primary);
}

.news-content p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

.news-meta a {
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition);
}

.news-meta a:hover {
  gap: 8px;
}

.empty-tip {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  background: var(--bg);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 17px;
}

.compare {
  background: var(--bg-dark);
  color: #fff;
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  margin-top: 20px;
}

.compare-card {
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  transition: var(--transition);
}

.compare-card.bad {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.compare-card.good {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.2), rgba(6, 182, 212, 0.14));
  border: 1px solid rgba(37, 99, 235, 0.35);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.compare-card h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
}

.compare-card.bad h3 i {
  color: #f87171;
}

.compare-card.good h3 i {
  color: #34d399;
}

.compare-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.compare-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.85);
}

.compare-list li i {
  font-size: 16px;
  flex-shrink: 0;
}

.compare-list li i.fa-xmark {
  color: #f87171;
}

.compare-list li i.fa-check {
  color: #34d399;
}

.feedback {
  background: var(--bg-white);
}

.feedback-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feedback-card {
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  border: 1px solid transparent;
  transition: var(--transition);
}

.feedback-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.feedback-card .quote {
  font-size: 28px;
  color: var(--primary);
  margin-bottom: 14px;
  opacity: 0.6;
}

.feedback-card p {
  font-size: 15px;
  color: var(--text);
  line-height: 1.75;
  margin-bottom: 20px;
}

.feedback-card .author {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 600;
}

.rating-bars {
  margin-top: 56px;
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px 48px;
}

.rating-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.rating-item .rating-label {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.rating-item .rating-label span:last-child {
  color: var(--primary);
}

.rating-bar {
  height: 8px;
  background: var(--border);
  border-radius: 100px;
  overflow: hidden;
}

.rating-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 100px;
}

.faq {
  background: var(--bg);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 14px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 26px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  text-align: left;
  transition: var(--transition);
}

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

.faq-question i {
  font-size: 18px;
  color: var(--text-muted);
  transition: transform .3s ease;
}

.faq-item.active .faq-question i {
  transform: rotate(45deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease, padding .3s ease;
  padding: 0 26px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-muted);
}

.faq-item.active .faq-answer {
  max-height: 200px;
  padding: 0 26px 24px;
}

.cta {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  padding: 80px 0;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
}

.cta::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
}

.cta-box {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.cta-box h2 {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.cta-box p {
  font-size: 17px;
  opacity: 0.9;
  margin-bottom: 32px;
}

.cta-box .btn {
  background: #fff;
  color: var(--primary);
  font-weight: 700;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.2);
}

.cta-box .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.25);
}

.site-footer {
  background: var(--bg-dark);
  color: #94a3b8;
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-brand .brand-icon {
  width: 36px;
  height: 36px;
  font-size: 15px;
}

.footer-brand .brand-name {
  color: #fff;
  font-size: 18px;
}

.footer-about {
  font-size: 14px;
  line-height: 1.8;
  color: #64748b;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: .5px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul a {
  font-size: 14px;
  color: #94a3b8;
  transition: var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 24px 0;
  font-size: 13px;
  text-align: center;
  color: #64748b;
}

.footer-bottom a {
  color: #94a3b8;
}

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

@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .feedback-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .search-box {
    width: 150px;
  }

  .nav-channels .nav-link {
    padding: 10px 12px;
    font-size: 14px;
  }

  .platform-grid {
    gap: 36px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .section-header h2 {
    font-size: 30px;
  }

  .site-header {
    position: sticky;
  }

  .nav-channels {
    display: none;
  }

  .nav-actions .search-box,
  .nav-actions .btn-login,
  .nav-actions .btn-primary {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero {
    padding: 90px 0 70px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-desc {
    font-size: 17px;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat strong {
    font-size: 24px;
  }

  .platform-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .process-steps {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .step-arrow {
    display: none;
  }

  .category-card {
    grid-template-columns: 1fr;
  }

  .category-media {
    min-height: 220px;
    position: relative;
  }

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

  .rating-bars {
    grid-template-columns: 1fr;
    padding: 28px;
  }

  .cta-box h2 {
    font-size: 28px;
  }

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

  .mobile-menu {
    display: none;
  }

  .mobile-menu.open {
    display: flex;
  }
}

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

  .brand-name {
    font-size: 16px;
  }

  .brand-icon {
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  .hero {
    padding: 70px 0 60px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero-desc {
    font-size: 15px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-stats {
    flex-direction: column;
    gap: 16px;
    padding-top: 28px;
  }

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

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

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

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

  .platform-content h2 {
    font-size: 28px;
  }

  .category-body {
    padding: 28px 24px;
  }

  .category-body h3 {
    font-size: 22px;
  }

  .news-cover {
    height: 190px;
  }

  .faq-question {
    padding: 18px 20px;
    font-size: 15px;
  }

  .faq-answer {
    padding: 0 20px;
  }

  .faq-item.active .faq-answer {
    padding: 0 20px 20px;
  }

  .compare-card {
    padding: 28px 22px;
  }

  .cta {
    padding: 60px 0;
  }

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

  .cta-box p {
    font-size: 15px;
  }

  .rating-bars {
    padding: 22px;
  }
}

/* roulang page: category1 */
:root{
  --primary:#0f4a7d;
  --primary-dark:#0a3054;
  --primary-light:#2f6fa3;
  --accent:#ffb703;
  --accent-dark:#e09d00;
  --accent-soft:#fff7e5;
  --bg:#f3f6fb;
  --surface:#ffffff;
  --text:#152c47;
  --text-muted:#60718a;
  --border:#dce5f0;
  --radius:20px;
  --radius-sm:12px;
  --shadow:0 18px 42px rgba(15,74,125,.09);
  --shadow-sm:0 6px 18px rgba(15,74,125,.07);
  --shadow-lg:0 26px 60px rgba(15,74,125,.14);
  --transition:.3s ease;
  --font:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;transition:color var(--transition)}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input{font-family:inherit}

.grid-container{max-width:1200px;padding-left:24px;padding-right:24px}
.section{padding:88px 0}
.section-head{
  max-width:720px;
  margin:0 auto 52px;
  text-align:center;
}
.section-tag{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:7px 18px;
  background:var(--accent-soft);
  color:var(--primary);
  font-size:14px;
  font-weight:600;
  border-radius:999px;
  letter-spacing:.4px;
  margin-bottom:16px;
}
.section-head h2{
  font-size:clamp(26px,3.4vw,38px);
  font-weight:800;
  line-height:1.35;
  color:var(--text);
  margin-bottom:14px;
}
.section-head p{
  font-size:16px;
  color:var(--text-muted);
  line-height:1.8;
}

/* buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 28px;
  font-size:15px;
  font-weight:600;
  border-radius:999px;
  transition:all var(--transition);
  border:2px solid transparent;
  white-space:nowrap;
}
.btn-primary{
  background:var(--accent);
  color:#0a3054;
  box-shadow:0 10px 24px rgba(255,183,3,.35);
}
.btn-primary:hover{
  background:#ffc72a;
  transform:translateY(-2px);
  box-shadow:0 14px 30px rgba(255,183,3,.45);
}
.btn-primary:active{transform:translateY(0);box-shadow:0 6px 14px rgba(255,183,3,.3)}
.btn-outline{
  border-color:rgba(255,255,255,.6);
  color:#fff;
  background:rgba(255,255,255,.08);
  backdrop-filter:blur(6px);
}
.btn-outline:hover{
  background:rgba(255,255,255,.16);
  border-color:#fff;
  transform:translateY(-2px);
}
.btn-ghost{
  background:transparent;
  color:#fff;
  border-color:rgba(255,255,255,.35);
}
.btn-ghost:hover{
  background:rgba(255,255,255,.12);
  border-color:#fff;
}
.btn:focus-visible{
  outline:3px solid rgba(255,183,3,.6);
  outline-offset:3px;
}

/* header */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
  box-shadow:0 4px 20px rgba(15,74,125,.06);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:22px;
  height:72px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
}
.brand-icon{
  width:40px;
  height:40px;
  border-radius:12px;
  background:linear-gradient(135deg,var(--primary),var(--primary-light));
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:17px;
  box-shadow:0 8px 18px rgba(15,74,125,.3);
}
.brand-name{
  font-size:19px;
  font-weight:800;
  color:var(--text);
  letter-spacing:.3px;
}
.nav-channels{
  display:flex;
  align-items:center;
  gap:8px;
}
.nav-channels .nav-link{
  padding:9px 20px;
  border-radius:999px;
  font-size:15px;
  font-weight:600;
  color:var(--text-muted);
  transition:all var(--transition);
  position:relative;
}
.nav-channels .nav-link:hover{
  color:var(--primary);
  background:rgba(15,74,125,.07);
}
.nav-channels .nav-link.active{
  color:var(--primary);
  background:rgba(15,74,125,.1);
}
.header-actions{
  display:flex;
  align-items:center;
  gap:14px;
}
.header-actions .btn{
  padding:9px 22px;
  font-size:14px;
}
.nav-toggle{
  display:none;
  width:42px;
  height:42px;
  border-radius:12px;
  background:var(--bg);
  color:var(--text);
  font-size:18px;
  align-items:center;
  justify-content:center;
  transition:background var(--transition);
}
.nav-toggle:hover{background:var(--border)}

/* hero */
.page-hero{
  position:relative;
  background:
    linear-gradient(135deg,rgba(7,28,50,.95) 0%,rgba(15,74,125,.85) 55%,rgba(47,111,163,.75) 100%),
    url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  padding:96px 0 88px;
  color:#fff;
  overflow:hidden;
}
.page-hero::before{
  content:'';
  position:absolute;
  top:-120px;
  right:-80px;
  width:360px;
  height:360px;
  border-radius:50%;
  background:rgba(255,183,3,.14);
  filter:blur(80px);
}
.page-hero .grid-container{position:relative;z-index:2}
.hero-inner{
  max-width:820px;
  margin:0 auto;
  text-align:center;
}
.hero-badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  background:rgba(255,255,255,.14);
  border:1px solid rgba(255,255,255,.25);
  backdrop-filter:blur(8px);
  padding:8px 20px;
  border-radius:999px;
  font-size:14px;
  letter-spacing:.5px;
  margin-bottom:26px;
}
.hero-inner h1{
  font-size:clamp(34px,5vw,54px);
  font-weight:800;
  line-height:1.25;
  margin-bottom:20px;
  letter-spacing:.5px;
  text-shadow:0 4px 18px rgba(0,0,0,.25);
}
.hero-inner h1 span{color:var(--accent)}
.hero-inner > p{
  font-size:17px;
  line-height:1.9;
  color:rgba(255,255,255,.85);
  max-width:680px;
  margin:0 auto 34px;
}
.hero-actions{
  display:flex;
  gap:16px;
  justify-content:center;
  flex-wrap:wrap;
  margin-bottom:48px;
}
.hero-stats{
  display:flex;
  justify-content:center;
  gap:38px;
  flex-wrap:wrap;
}
.hero-stats .stat{
  text-align:center;
  min-width:120px;
}
.hero-stats .stat strong{
  display:block;
  font-size:30px;
  font-weight:800;
  color:var(--accent);
}
.hero-stats .stat span{
  font-size:13px;
  color:rgba(255,255,255,.72);
  letter-spacing:1px;
}

/* section generic */
.prep-section,.methods-section{background:var(--surface)}
.flow-section{background:var(--bg)}
.security-section{
  background:linear-gradient(180deg,#0b2e50,#0f4a7d);
  color:#fff;
}
.security-section .section-head h2{color:#fff}
.security-section .section-head p{color:rgba(255,255,255,.72)}
.security-section .section-tag{background:rgba(255,183,3,.18);color:var(--accent)}

/* prep cards */
.prep-grid>.cell{margin-bottom:26px}
.prep-card{
  height:100%;
  background:var(--surface);
  border-radius:var(--radius);
  padding:36px 30px 30px;
  border:1px solid var(--border);
  box-shadow:var(--shadow-sm);
  transition:transform var(--transition),box-shadow var(--transition);
  text-align:center;
}
.prep-card:hover{
  transform:translateY(-8px);
  box-shadow:var(--shadow-lg);
  border-color:rgba(255,183,3,.5);
}
.prep-icon{
  width:64px;
  height:64px;
  border-radius:20px;
  background:var(--accent-soft);
  color:var(--primary);
  font-size:24px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin:0 auto 22px;
  transition:background var(--transition),color var(--transition);
}
.prep-card:hover .prep-icon{
  background:var(--primary);
  color:var(--accent);
}
.prep-card h3{
  font-size:18px;
  font-weight:700;
  margin-bottom:12px;
  color:var(--text);
}
.prep-card p{
  font-size:15px;
  color:var(--text-muted);
  line-height:1.8;
}
.prep-card::after{
  content:'\f058';
  font-family:'Font Awesome 6 Free';
  font-weight:900;
  position:absolute;
  top:16px;
  right:16px;
  color:var(--accent);
  font-size:18px;
}
.prep-card{position:relative}

/* flow steps */
.flow-section{overflow:hidden}
.flow-steps{
  max-width:760px;
  margin:0 auto;
  position:relative;
  padding-left:0;
}
.flow-steps::before{
  content:'';
  position:absolute;
  left:29px;
  top:20px;
  bottom:20px;
  width:3px;
  border-radius:3px;
  background:linear-gradient(180deg,var(--accent),rgba(255,183,3,.1),var(--primary-light));
}
.flow-step{
  position:relative;
  display:flex;
  gap:32px;
  padding:0 0 40px;
}
.flow-step:last-child{padding-bottom:10px}
.step-num{
  flex-shrink:0;
  width:60px;
  height:60px;
  border-radius:50%;
  background:var(--primary);
  color:var(--accent);
  font-size:18px;
  font-weight:800;
  display:flex;
  align-items:center;
  justify-content:center;
  z-index:1;
  box-shadow:0 0 0 6px var(--bg),0 10px 22px rgba(15,74,125,.25);
}
.step-content{
  background:var(--surface);
  border-radius:var(--radius);
  padding:26px 30px;
  border:1px solid var(--border);
  box-shadow:var(--shadow-sm);
  flex:1;
  transition:box-shadow var(--transition),transform var(--transition);
}
.step-content:hover{
  box-shadow:var(--shadow);
  transform:translateX(4px);
}
.step-content h3{
  font-size:18px;
  font-weight:700;
  color:var(--text);
  margin-bottom:10px;
}
.step-content h3::before{
  content:'';
  display:inline-block;
  width:5px;
  height:18px;
  background:var(--accent);
  border-radius:99px;
  margin-right:12px;
  vertical-align:-2px;
}
.step-content p{
  font-size:15px;
  color:var(--text-muted);
  line-height:1.8;
}

/* methods cards */
.methods-grid>.cell{margin-bottom:28px}
.method-card{
  height:100%;
  background:var(--surface);
  border-radius:var(--radius);
  border:1px solid var(--border);
  overflow:hidden;
  box-shadow:var(--shadow-sm);
  transition:transform var(--transition),box-shadow var(--transition);
  display:flex;
  flex-direction:column;
}
.method-card:hover{
  transform:translateY(-8px);
  box-shadow:var(--shadow-lg);
  border-color:rgba(255,183,3,.45);
}
.method-cover{
  position:relative;
  height:190px;
  overflow:hidden;
}
.method-cover img{
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .5s ease;
}
.method-card:hover .method-cover img{
  transform:scale(1.06);
}
.method-cover::after{
  content:'';
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,transparent 55%,rgba(10,48,84,.45));
}
.method-badge{
  position:absolute;
  top:16px;
  left:16px;
  z-index:2;
  background:var(--accent);
  color:var(--primary-dark);
  font-size:13px;
  font-weight:800;
  padding:6px 14px;
  border-radius:999px;
  box-shadow:0 6px 14px rgba(0,0,0,.15);
}
.method-body{
  padding:26px 26px 28px;
  display:flex;
  flex-direction:column;
  flex:1;
}
.method-body h3{
  font-size:19px;
  font-weight:700;
  color:var(--text);
  margin-bottom:10px;
}
.method-body > p{
  font-size:15px;
  color:var(--text-muted);
  line-height:1.8;
  margin-bottom:18px;
}
.method-list{
  list-style:none;
  margin-top:auto;
}
.method-list li{
  display:flex;
  align-items:center;
  gap:10px;
  padding:7px 0;
  font-size:14px;
  color:var(--text);
  border-top:1px dashed var(--border);
}
.method-list li:first-child{border-top:none}
.method-list li i{
  color:var(--accent-dark);
  font-size:16px;
}

/* security */
.security-grid>.cell{
  margin-bottom:30px;
}
.security-item{
  display:flex;
  gap:18px;
  align-items:flex-start;
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.12);
  border-radius:var(--radius);
  padding:28px;
  height:100%;
  transition:background var(--transition),border-color var(--transition),transform var(--transition);
}
.security-item:hover{
  background:rgba(255,255,255,.1);
  border-color:rgba(255,183,3,.45);
  transform:translateY(-4px);
}
.security-icon{
  flex-shrink:0;
  width:52px;
  height:52px;
  border-radius:16px;
  background:rgba(255,183,3,.2);
  color:var(--accent);
  font-size:20px;
  display:flex;
  align-items:center;
  justify-content:center;
}
.security-item h3{
  font-size:17px;
  font-weight:700;
  color:#fff;
  margin-bottom:6px;
}
.security-item p{
  font-size:14.5px;
  color:rgba(255,255,255,.7);
  line-height:1.75;
}
.security-note{
  margin-top:40px;
  text-align:center;
  font-size:14.5px;
  color:rgba(255,255,255,.65);
  background:rgba(255,255,255,.06);
  border-radius:var(--radius-sm);
  padding:18px 26px;
  display:inline-block;
}
.security-note i{color:var(--accent);margin-right:8px}

/* faq */
.faq-section{background:var(--surface)}
.faq-list{
  max-width:800px;
  margin:0 auto;
}
.faq-item{
  background:var(--bg);
  border-radius:var(--radius-sm);
  border:1px solid var(--border);
  margin-bottom:16px;
  overflow:hidden;
  transition:border-color var(--transition),box-shadow var(--transition);
}
.faq-item:hover{
  border-color:rgba(255,183,3,.5);
  box-shadow:var(--shadow-sm);
}
.faq-item summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding:22px 28px;
  font-size:16px;
  font-weight:600;
  color:var(--text);
  cursor:pointer;
  list-style:none;
  user-select:none;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary i{
  color:var(--primary);
  transition:transform var(--transition);
  flex-shrink:0;
}
.faq-item[open] summary i{
  transform:rotate(180deg);
}
.faq-item[open]{
  border-color:rgba(255,183,3,.4);
  box-shadow:var(--shadow-sm);
}
.faq-body{
  padding:0 28px 24px;
  font-size:15px;
  color:var(--text-muted);
  line-height:1.85;
}
.faq-body p{
  border-top:1px dashed var(--border);
  padding-top:16px;
}

/* cta */
.cta-section{padding:0 0 80px}
.cta-panel{
  background:linear-gradient(115deg,#0a3054,#164e7d 60%,#2f6fa3);
  border-radius:28px;
  padding:56px 54px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:36px;
  flex-wrap:wrap;
  box-shadow:var(--shadow-lg);
  position:relative;
  overflow:hidden;
}
.cta-panel::before{
  content:'';
  position:absolute;
  top:-100px;
  right:-60px;
  width:260px;
  height:260px;
  border-radius:50%;
  background:rgba(255,183,3,.16);
  filter:blur(60px);
}
.cta-panel > div{position:relative;z-index:2}
.cta-panel h2{
  font-size:28px;
  font-weight:800;
  color:#fff;
  margin-bottom:10px;
}
.cta-panel p{
  font-size:15.5px;
  color:rgba(255,255,255,.8);
  max-width:480px;
  line-height:1.8;
}
.cta-actions{
  display:flex;
  gap:14px;
  flex-wrap:wrap;
  align-items:center;
}

/* footer */
.site-footer{
  background:#0a2a46;
  color:rgba(255,255,255,.75);
  padding:64px 0 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1.2fr;
  gap:44px;
  padding-bottom:44px;
  border-bottom:1px solid rgba(255,255,255,.1);
}
.footer-brand{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:16px;
}
.footer-brand .brand-icon{
  background:rgba(255,183,3,.2);
  color:var(--accent);
  box-shadow:none;
}
.footer-brand .brand-name{
  color:#fff;
  font-size:19px;
}
.footer-about{
  font-size:14.5px;
  line-height:1.85;
  color:rgba(255,255,255,.65);
  max-width:320px;
}
.footer-col h4{
  color:#fff;
  font-size:16px;
  font-weight:700;
  margin-bottom:18px;
  position:relative;
  padding-bottom:10px;
}
.footer-col h4::after{
  content:'';
  position:absolute;
  left:0;
  bottom:0;
  width:28px;
  height:3px;
  border-radius:9px;
  background:var(--accent);
}
.footer-col ul{
  list-style:none;
}
.footer-col ul li{
  margin-bottom:10px;
}
.footer-col ul a{
  font-size:14.5px;
  color:rgba(255,255,255,.6);
  transition:all var(--transition);
  display:inline-flex;
  align-items:center;
  gap:6px;
}
.footer-col ul a::before{
  content:'\f105';
  font-family:'Font Awesome 6 Free';
  font-weight:900;
  font-size:12px;
  color:var(--accent);
  opacity:.7;
}
.footer-col ul a:hover{
  color:#fff;
  padding-left:4px;
}
.footer-bottom{
  padding:24px 0;
  text-align:center;
  font-size:13.5px;
  color:rgba(255,255,255,.5);
}
.footer-bottom a{
  color:rgba(255,255,255,.6);
}
.footer-bottom a:hover{
  color:var(--accent);
}

/* responsive */
@media(max-width:1024px){
  .section{padding:72px 0}
  .page-hero{padding:80px 0 70px}
  .footer-grid{
    grid-template-columns:1fr 1fr;
    gap:36px;
  }
  .cta-panel{
    padding:46px 38px;
  }
}
@media(max-width:768px){
  .header-inner{
    height:64px;
    flex-wrap:wrap;
  }
  .brand-name{font-size:17px}
  .nav-channels{
    position:fixed;
    top:64px;
    left:0;
    right:0;
    background:#fff;
    flex-direction:column;
    align-items:stretch;
    padding:10px 20px 18px;
    border-bottom:1px solid var(--border);
    box-shadow:0 14px 30px rgba(15,74,125,.1);
    transform:translateY(-120%);
    transition:transform .32s ease;
    z-index:99;
    gap:4px;
  }
  .nav-channels.open{
    transform:translateY(0);
  }
  .nav-channels .nav-link{
    padding:12px 16px;
    border-radius:12px;
    font-size:15px;
  }
  .header-actions .btn{
    padding:9px 16px;
    font-size:13px;
  }
  .nav-toggle{
    display:flex;
  }
  .section{padding:60px 0}
  .section-head{margin-bottom:38px}
  .page-hero{padding:62px 0 56px}
  .hero-inner h1{font-size:32px}
  .hero-inner > p{font-size:15px}
  .hero-stats{gap:24px}
  .hero-stats .stat strong{font-size:24px}
  .flow-step{gap:20px}
  .flow-steps::before{left:24px}
  .step-num{width:50px;height:50px;font-size:16px}
  .footer-grid{grid-template-columns:1fr}
  .cta-panel{
    padding:36px 28px;
    flex-direction:column;
    align-items:flex-start;
    border-radius:22px;
  }
  .cta-panel h2{font-size:23px}
  .security-item{padding:22px}
  .methods-grid>.cell,.prep-grid>.cell{
    margin-bottom:20px;
  }
}
@media(max-width:520px){
  .grid-container{padding-left:18px;padding-right:18px}
  .brand-name{
    max-width:110px;
    font-size:15px;
    line-height:1.3;
  }
  .brand-icon{
    width:36px;
    height:36px;
    font-size:15px;
  }
  .header-actions .btn span{
    display:none;
  }
  .header-actions .btn{
    width:38px;
    height:38px;
    padding:0;
    border-radius:11px;
    font-size:15px;
  }
  .section{padding:48px 0}
  .section-head h2{font-size:24px}
  .section-head p{font-size:14.5px}
  .page-hero{
    padding:52px 0 46px;
    background-size:cover;
  }
  .hero-badge{font-size:12.5px;padding:6px 15px}
  .hero-inner h1{font-size:27px}
  .hero-actions{gap:10px}
  .btn{padding:11px 22px;font-size:14px}
  .hero-stats{
    gap:14px;
  }
  .hero-stats .stat{
    min-width:90px;
  }
  .hero-stats .stat strong{font-size:21px}
  .flow-step{
    flex-direction:column;
    gap:14px;
  }
  .flow-steps::before{
    left:25px;
    top:70px;
    bottom:20px;
  }
  .step-content{
    padding:20px 22px;
  }
  .step-num{
    width:52px;
    height:52px;
    font-size:15px;
  }
  .prep-card{
    padding:28px 22px 24px;
  }
  .method-cover{height:170px}
  .faq-item summary{
    padding:18px 20px;
    font-size:15px;
  }
  .faq-body{
    padding:0 20px 18px;
  }
  .footer-grid{
    gap:26px;
  }
  .cta-panel{
    padding:30px 22px;
    gap:22px;
  }
  .cta-panel h2{font-size:21px}
  .footer-bottom{
    font-size:12.5px;
  }
}

/* roulang page: article */
:root {
  --primary: #1d63ed;
  --primary-dark: #1449b8;
  --primary-light: #eaf1ff;
  --teal: #17c3b2;
  --accent: #ff6b35;
  --bg: #f5f8fc;
  --white: #ffffff;
  --text: #142536;
  --text-light: #5b6b80;
  --text-muted: #8b99ad;
  --border: #e2e8f2;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 2px 10px rgba(20, 37, 54, .05);
  --shadow: 0 10px 30px rgba(20, 37, 54, .08);
  --shadow-lg: 0 24px 60px rgba(20, 37, 54, .12);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --container: 1200px;
  --header-h: 72px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -.2px;
  white-space: nowrap;
  flex-shrink: 0;
}
.brand:hover { color: var(--text); }
.brand-icon {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--teal));
  color: #fff;
  border-radius: 10px;
  font-size: 1.05rem;
  box-shadow: 0 4px 12px rgba(29, 99, 237, .25);
}
.nav-channels {
  display: flex;
  gap: 4px;
  margin: 0 auto;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  border-radius: 20px;
  font-size: .94rem;
  font-weight: 500;
  color: var(--text-light);
  transition: all .2s;
}
.nav-link:hover {
  color: var(--primary);
  background: var(--primary-light);
}
.nav-link.active {
  color: var(--primary);
  background: var(--primary-light);
  font-weight: 600;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.header-search {
  display: flex;
  align-items: center;
  background: #f1f4fa;
  border: 1px solid transparent;
  border-radius: 22px;
  padding: 0 6px 0 14px;
  height: 38px;
  transition: all .25s;
}
.header-search:focus-within {
  background: #fff;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(29, 99, 237, .08);
}
.header-search input {
  border: none;
  outline: none;
  background: transparent;
  width: 120px;
  font-size: .85rem;
  color: var(--text);
}
.header-search button {
  border: none;
  background: transparent;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  color: var(--text-light);
  cursor: pointer;
  transition: all .2s;
  font-size: .85rem;
}
.header-search button:hover {
  background: var(--primary);
  color: #fff;
}
.nav-toggle {
  display: none;
  border: none;
  background: transparent;
  width: 42px;
  height: 42px;
  cursor: pointer;
  padding: 10px;
  border-radius: 8px;
  flex-shrink: 0;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  margin: 4px auto;
  transition: all .25s;
  width: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: 24px;
  font-weight: 600;
  font-size: .95rem;
  line-height: 1.4;
  padding: 10px 24px;
  cursor: pointer;
  transition: all .25s;
  text-decoration: none;
}
.btn-sm { padding: 8px 18px; font-size: .88rem; }
.btn-lg { padding: 14px 38px; font-size: 1.05rem; border-radius: 30px; }
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 6px 18px rgba(29, 99, 237, .3);
}
.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
  box-shadow: 0 8px 24px rgba(29, 99, 237, .38);
  transform: translateY(-1px);
}
.btn-outline {
  background: transparent;
  border: 2px solid rgba(255, 255, 255, .7);
  color: #fff;
}
.btn-outline:hover {
  background: rgba(255, 255, 255, .12);
  border-color: #fff;
  color: #fff;
  transform: translateY(-1px);
}
.btn-outline-primary {
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
}
.btn-outline-primary:hover {
  background: var(--primary);
  color: #fff;
}

.article-hero {
  position: relative;
  background: linear-gradient(135deg, rgba(12, 24, 42, .92) 0%, rgba(29, 99, 237, .82) 100%), url('/assets/images/backpic/back-1.png') center / cover no-repeat;
  color: #fff;
  padding: 68px 0 58px;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: .88rem;
  opacity: .9;
  margin-bottom: 24px;
}
.breadcrumb a { color: rgba(255, 255, 255, .78); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb .current { color: #fff; font-weight: 600; }
.breadcrumb .sep { opacity: .5; }
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, .15);
  border: 1px solid rgba(255, 255, 255, .2);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: .82rem;
  font-weight: 500;
  color: #fff;
  backdrop-filter: blur(4px);
}
.article-title {
  font-size: 2.2rem;
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -.5px;
  max-width: 820px;
  margin-bottom: 14px;
}
.article-desc {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, .88);
  max-width: 740px;
  line-height: 1.75;
}

.article-section {
  padding: 48px 0 56px;
}
.article-main {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 40px;
  box-shadow: var(--shadow-sm);
}
.article-content {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text);
  overflow-wrap: break-word;
}
.article-content h2,
.article-content h3,
.article-content h4 {
  margin-top: 28px;
  margin-bottom: 14px;
  line-height: 1.4;
  color: var(--text);
  font-weight: 700;
}
.article-content h2 { font-size: 1.45rem; }
.article-content h3 { font-size: 1.2rem; }
.article-content p { margin-bottom: 18px; }
.article-content ul,
.article-content ol {
  margin: 0 0 20px 24px;
  list-style: disc;
}
.article-content ol { list-style: decimal; }
.article-content li { margin-bottom: 8px; }
.article-content blockquote {
  border-left: 4px solid var(--primary);
  background: var(--primary-light);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 20px 0;
  color: var(--text-light);
}
.article-content img {
  border-radius: var(--radius-sm);
  margin: 20px 0;
}
.article-content a {
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.article-bottom-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.not-found-card {
  text-align: center;
  padding: 70px 30px;
  background: var(--white);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}
.not-found-icon {
  font-size: 3rem;
  color: var(--primary);
  display: block;
  margin-bottom: 18px;
}
.not-found-card h2 {
  font-size: 1.6rem;
  margin-bottom: 10px;
}
.not-found-card p {
  color: var(--text-light);
  margin-bottom: 28px;
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.sidebar-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .25s;
}
.sidebar-card:hover {
  box-shadow: var(--shadow);
}
.sidebar-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.sidebar-card h3 i {
  color: var(--primary);
}
.sidebar-list li {
  margin-bottom: 6px;
}
.sidebar-list a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-light);
  padding: 8px 12px;
  border-radius: 8px;
  transition: all .2s;
  font-size: .92rem;
}
.sidebar-list a:hover {
  background: var(--primary-light);
  color: var(--primary);
}
.sidebar-list a i {
  font-size: .78rem;
}
.sidebar-tip {
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-size: .88rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-top: 8px;
}
.sidebar-card p {
  font-size: .92rem;
  color: var(--text-light);
  line-height: 1.75;
}
.sidebar-btn-wrap {
  margin-top: 16px;
}

.service-section {
  padding: 56px 0;
  background: var(--white);
}
.section-head {
  text-align: center;
  max-width: 660px;
  margin: 0 auto 44px;
}
.section-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: .82rem;
  font-weight: 600;
  padding: 5px 18px;
  border-radius: 20px;
  margin-bottom: 14px;
}
.section-title {
  font-size: 1.8rem;
  line-height: 1.35;
  font-weight: 800;
  letter-spacing: -.3px;
  margin-bottom: 12px;
}
.section-subtitle {
  color: var(--text-light);
  font-size: 1rem;
  line-height: 1.7;
}
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  min-height: 250px;
  display: flex;
  align-items: flex-end;
  color: #fff;
  box-shadow: var(--shadow);
  transition: transform .3s, box-shadow .3s;
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.service-card-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: transform .4s;
}
.service-card:hover .service-card-bg {
  transform: scale(1.04);
}
.service-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(13, 26, 45, .1) 0%, rgba(13, 26, 45, .28) 50%, rgba(13, 26, 45, .88) 100%);
  z-index: 1;
}
.service-card-content {
  position: relative;
  z-index: 2;
  padding: 28px;
  width: 100%;
}
.service-icon {
  display: inline-flex;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, .18);
  border: 1px solid rgba(255, 255, 255, .25);
  border-radius: 12px;
  font-size: 1.1rem;
  backdrop-filter: blur(4px);
  margin-bottom: 14px;
}
.service-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.service-card p {
  font-size: .92rem;
  color: rgba(255, 255, 255, .9);
  line-height: 1.65;
  margin-bottom: 16px;
}
.service-link {
  color: #fff;
  font-size: .9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap .2s;
}
.service-link:hover {
  color: #fff;
  gap: 10px;
}

.cta-section {
  padding: 72px 0;
  background: linear-gradient(135deg, #0d1c30 0%, #134096 100%), url('/assets/images/backpic/back-2.png') center / cover no-repeat;
  color: #fff;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-inner {
  max-width: 720px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}
.cta-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -.4px;
  margin-bottom: 16px;
}
.cta-subtitle {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, .82);
  line-height: 1.75;
  margin-bottom: 32px;
}
.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.faq-section {
  padding: 64px 0;
  background: var(--bg);
}
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}
.faq-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow .25s, border-color .25s;
}
.faq-item.active {
  box-shadow: var(--shadow);
  border-color: rgba(29, 99, 237, .3);
}
.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  background: transparent;
  border: none;
  padding: 18px 22px;
  font-size: .98rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  text-align: left;
  transition: color .2s;
}
.faq-question:hover {
  color: var(--primary);
}
.faq-question i {
  transition: transform .3s;
  opacity: .6;
  flex-shrink: 0;
}
.faq-item.active .faq-question i {
  transform: rotate(180deg);
  opacity: 1;
  color: var(--primary);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease;
  padding: 0 22px;
}
.faq-item.active .faq-answer {
  max-height: 600px;
  padding: 0 22px 20px;
}
.faq-answer p {
  font-size: .95rem;
  color: var(--text-light);
  line-height: 1.75;
}

.site-footer {
  background: #0d1c30;
  color: rgba(255, 255, 255, .75);
  padding: 60px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 36px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-brand .brand-icon {
  background: linear-gradient(135deg, var(--primary), var(--teal));
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: .95rem;
}
.footer-brand .brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}
.footer-about {
  font-size: .92rem;
  line-height: 1.75;
  max-width: 360px;
}
.footer-col h4 {
  color: #fff;
  font-size: .95rem;
  font-weight: 600;
  margin-bottom: 16px;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul a {
  color: rgba(255, 255, 255, .65);
  font-size: .9rem;
  transition: color .2s, padding-left .2s;
}
.footer-col ul a:hover {
  color: #fff;
  padding-left: 4px;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .12);
  padding-top: 22px;
  text-align: center;
  font-size: .85rem;
  color: rgba(255, 255, 255, .5);
}
.footer-bottom a {
  color: rgba(255, 255, 255, .7);
  margin: 0 4px;
}
.footer-bottom a:hover {
  color: #fff;
}

@media (max-width: 1024px) {
  .header-search { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .article-hero { padding: 48px 0 40px; }
  .article-title { font-size: 1.7rem; }
  .article-main { padding: 28px 22px; }
  .cta-title { font-size: 1.5rem; }
  .cell.large-8 { margin-bottom: 24px; }
}
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .nav-channels {
    display: none;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 14px 24px 22px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, .08);
    border-bottom: 1px solid var(--border);
    z-index: 99;
  }
  .site-header.nav-open .nav-channels { display: flex; }
  .nav-toggle { display: block; }
  .header-actions { display: none; }
  .service-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .article-bottom-nav .btn { width: 100%; }
  .cta-buttons .btn { width: 100%; }
}