/* roulang page: index */
:root {
  --primary: #0f2b46;
  --primary-light: #1a4b8c;
  --primary-lighter: #3b7dd8;
  --accent: #f59e0b;
  --accent-light: #fbbf24;
  --accent-dark: #d97706;
  --bg: #f7f9fc;
  --bg-alt: #eef2f7;
  --bg-dark: #0b1f33;
  --text: #1e293b;
  --text-muted: #5b6b7f;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --white: #ffffff;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --shadow: 0 4px 24px rgba(15, 43, 70, 0.08);
  --shadow-hover: 0 12px 32px rgba(15, 43, 70, 0.14);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

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

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
}

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

.section {
  padding: 80px 0;
}

.section--alt {
  background: var(--white);
}

.section--dark {
  background: var(--bg-dark);
  color: var(--white);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-header .section-tag {
  display: inline-block;
  background: rgba(27, 75, 140, 0.08);
  color: var(--primary-light);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-header p {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.7;
}

.section--dark .section-header h2 {
  color: var(--white);
}

.section--dark .section-header p {
  color: rgba(255, 255, 255, 0.75);
}

.section--dark .section-tag {
  background: rgba(255, 255, 255, 0.12);
  color: var(--accent-light);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  transition: var(--transition);
  white-space: nowrap;
  text-align: center;
  border: 2px solid transparent;
}

.btn i {
  font-size: 14px;
  transition: transform 0.3s;
}

.btn:hover i.fa-arrow-right {
  transform: translateX(4px);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-dark);
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.35);
}

.btn-primary:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.45);
}

.btn-outline {
  border-color: rgba(255, 255, 255, 0.6);
  color: var(--accent-light);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.btn-dark {
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 4px 16px rgba(15, 43, 70, 0.25);
}

.btn-dark:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(15, 43, 70, 0.35);
}

.badge {
  display: inline-block;
  background: rgba(27, 75, 140, 0.1);
  color: var(--primary-light);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.badge--accent {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-dark);
}

/* ========= Header ========= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--white);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.header-top {
  background: var(--white);
  border-bottom: 1px solid var(--border);
}

.header-top__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

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

.brand-logo__icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  box-shadow: 0 4px 12px rgba(15, 43, 70, 0.25);
}

.brand-logo__name {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.brand-logo__name span {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  margin-top: 2px;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-search {
  position: relative;
  display: flex;
  align-items: center;
}

.header-search input {
  width: 220px;
  height: 40px;
  padding: 0 44px 0 16px;
  border: 1px solid var(--border);
  border-radius: 40px;
  font-size: 14px;
  background: var(--bg);
  transition: var(--transition);
}

.header-search input:focus {
  border-color: var(--primary-lighter);
  background: var(--white);
  box-shadow: 0 0 0 4px rgba(59, 125, 216, 0.12);
}

.header-search button {
  position: absolute;
  right: 4px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: var(--transition);
}

.header-search button:hover {
  color: var(--primary);
}

.header-menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font-size: 18px;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.header-menu-btn:hover {
  background: rgba(27, 75, 140, 0.08);
  color: var(--primary);
}

.header-nav {
  background: var(--white);
  border-bottom: 1px solid var(--border);
}

.header-nav .container {
  display: flex;
  align-items: center;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.nav-menu::-webkit-scrollbar {
  display: none;
}

.nav-menu__link {
  display: block;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 3px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
  position: relative;
}

.nav-menu__link:hover {
  color: var(--primary);
}

.nav-menu__link.active {
  color: var(--primary);
  font-weight: 600;
  border-bottom-color: var(--accent);
}

.nav-menu__link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 3px;
  background: var(--accent);
  border-radius: 3px 3px 0 0;
}

/* ========= Hero ========= */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  background-image: linear-gradient(135deg, rgba(11, 31, 51, 0.92) 0%, rgba(15, 43, 70, 0.78) 60%, rgba(27, 75, 140, 0.55) 100%), url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  color: var(--white);
  padding: 96px 0 88px;
}

.hero-content {
  max-width: 720px;
}

.hero-content .hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--accent-light);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 100px;
  margin-bottom: 26px;
  letter-spacing: 0.05em;
}

.hero-content h1 {
  font-size: 52px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
  color: var(--white);
}

.hero-content h1 span {
  color: var(--accent-light);
}

.hero-content p {
  font-size: 18px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 40px;
  max-width: 560px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.hero-stat {
  display: flex;
  flex-direction: column;
}

.hero-stat strong {
  font-size: 32px;
  font-weight: 700;
  color: var(--accent-light);
  line-height: 1.2;
}

.hero-stat span {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 4px;
}

/* ========= Intro ========= */
.intro-section {
  padding: 90px 0;
}

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

.intro-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
}

.intro-image img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

.intro-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(15, 43, 70, 0.35), transparent 50%);
}

.intro-image .intro-badge {
  position: absolute;
  bottom: 20px;
  left: 20px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(4px);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 12px;
  z-index: 1;
  box-shadow: var(--shadow);
}

.intro-content .section-tag {
  display: inline-block;
  background: rgba(27, 75, 140, 0.08);
  color: var(--primary-light);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.intro-content h2 {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

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

.intro-points {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 28px;
}

.intro-point {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  transition: var(--transition);
}

.intro-point:hover {
  border-color: var(--primary-lighter);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.intro-point i {
  color: var(--accent);
  font-size: 15px;
}

/* ========= Category ========= */
.category-section {
  background: var(--bg-alt);
  padding: 90px 0;
}

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

.category-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.category-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-6px);
}

.category-card__media {
  position: relative;
  overflow: hidden;
  height: 220px;
}

.category-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.category-card:hover .category-card__media img {
  transform: scale(1.06);
}

.category-card__media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(15, 43, 70, 0.45), transparent 50%);
}

.category-card__media .category-card__icon {
  position: absolute;
  bottom: 14px;
  left: 20px;
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: var(--bg-dark);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  z-index: 1;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

.category-card__body {
  padding: 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.category-card__body h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}

.category-card__body p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  flex: 1;
}

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

.category-card__link i {
  transition: transform 0.3s;
}

.category-card__link:hover {
  color: var(--primary);
}

.category-card__link:hover i {
  transform: translateX(4px);
}

/* ========= News ========= */
.news-section {
  padding: 90px 0;
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-width: 960px;
  margin: 0 auto;
}

.news-item {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: var(--transition);
}

.news-item:hover {
  box-shadow: var(--shadow-hover);
  border-color: rgba(27, 75, 140, 0.2);
  transform: translateX(4px);
}

.news-item__content {
  flex: 1;
}

.news-item__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

.news-item__meta time {
  display: flex;
  align-items: center;
  gap: 4px;
}

.news-item h3 {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 6px;
  color: var(--text);
  transition: var(--transition);
}

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

.news-item__desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-item__read {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-light);
  padding-top: 6px;
}

.news-item__read:hover {
  color: var(--accent-dark);
}

.empty-tip {
  text-align: center;
  padding: 60px 24px;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px dashed var(--border);
  color: var(--text-muted);
  font-size: 16px;
}

/* ========= Stats ========= */
.stats-section {
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
  padding: 70px 0;
}

.stats-section::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.12) 0%, transparent 70%);
  border-radius: 50%;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  position: relative;
  z-index: 1;
}

.stat-item {
  text-align: center;
  padding: 32px 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  transition: var(--transition);
}

.stat-item:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(245, 158, 11, 0.3);
  transform: translateY(-4px);
}

.stat-item__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent);
  border-radius: 14px;
  font-size: 20px;
  margin-bottom: 16px;
}

.stat-item strong {
  font-size: 40px;
  font-weight: 700;
  color: var(--white);
  display: block;
  line-height: 1.2;
  margin-bottom: 6px;
}

.stat-item span {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.65);
}

/* ========= Steps ========= */
.steps-section {
  padding: 90px 0;
  background: var(--white);
}

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

.steps-grid::before {
  content: '';
  position: absolute;
  top: 36px;
  left: 12%;
  right: 12%;
  height: 2px;
  background: linear-gradient(to right, rgba(27, 75, 140, 0.15), rgba(245, 158, 11, 0.3), rgba(27, 75, 140, 0.15));
  z-index: 0;
}

.step-item {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 24px 16px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}

.step-item:hover {
  border-color: rgba(245, 158, 11, 0.4);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.step-item__num {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  box-shadow: 0 6px 18px rgba(15, 43, 70, 0.2);
}

.step-item h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.step-item p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ========= Features ========= */
.features-section {
  background: var(--bg);
  padding: 90px 0;
}

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

.feature-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(27, 75, 140, 0.15);
}

.feature-card__icon {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(27, 75, 140, 0.1), rgba(59, 125, 216, 0.12));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--primary-light);
  margin: 0 auto 22px;
  transition: var(--transition);
}

.feature-card:hover .feature-card__icon {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  box-shadow: 0 8px 20px rgba(15, 43, 70, 0.3);
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
}

.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ========= FAQ ========= */
.faq-section {
  background: var(--white);
  padding: 90px 0;
}

.faq-wrap {
  max-width: 820px;
  margin: 0 auto;
}

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

.faq-item.active {
  background: var(--white);
  border-color: rgba(27, 75, 140, 0.25);
  box-shadow: var(--shadow);
}

.faq-item__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 28px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  text-align: left;
  transition: var(--transition);
}

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

.faq-item__question .faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(27, 75, 140, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--primary);
  flex-shrink: 0;
  transition: all 0.35s;
}

.faq-item.active .faq-icon {
  background: var(--accent);
  color: var(--bg-dark);
  transform: rotate(45deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  padding: 0 28px;
}

.faq-item__answer-inner {
  padding-bottom: 24px;
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
}

.faq-item__answer p {
  margin-bottom: 8px;
}

.faq-item__answer p:last-child {
  margin-bottom: 0;
}

/* ========= CTA ========= */
.cta-section {
  padding: 90px 0;
  background-image: linear-gradient(135deg, rgba(11, 31, 51, 0.94), rgba(15, 43, 70, 0.88)), url('/assets/images/backpic/back-2.png');
  background-size: cover;
  background-position: center;
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.15), transparent 70%);
  border-radius: 50%;
  transform: translateX(-50%);
}

.cta-inner {
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.cta-inner h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}

.cta-inner p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 36px;
  line-height: 1.7;
}

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

/* ========= Footer ========= */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255, 255, 255, 0.7);
  padding-top: 60px;
  font-size: 14px;
}

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

.footer-brand .brand-logo {
  margin-bottom: 20px;
}

.footer-brand .brand-logo__name {
  color: var(--white);
}

.footer-brand .brand-logo__name span {
  color: rgba(255, 255, 255, 0.6);
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6);
  max-width: 320px;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 20px;
}

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

.footer-col ul li a {
  color: rgba(255, 255, 255, 0.6);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

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

.footer-bottom {
  padding: 28px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  color: rgba(255, 255, 255, 0.4);
  font-size: 13px;
}

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

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

.footer-links {
  display: flex;
  gap: 20px;
}

/* ========= 动画 ========= */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .animate-on-scroll {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ========= 响应式 ========= */
@media (max-width: 1024px) {
  .hero-content h1 {
    font-size: 44px;
  }

  .intro-grid {
    gap: 40px;
  }

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

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

  .steps-grid::before {
    display: none;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr 1.5fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }

  .header-search {
    display: none;
  }

  .header-menu-btn {
    display: flex;
  }

  .header-nav {
    display: none;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
  }

  .header-nav.open {
    display: block;
    max-height: 400px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
  }

  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    padding: 10px 0;
  }

  .nav-menu__link {
    padding: 14px 24px;
    border-bottom: 1px solid var(--border);
    border-left: 3px solid transparent;
  }

  .nav-menu__link.active {
    border-left-color: var(--accent);
    border-bottom-color: var(--border);
  }

  .nav-menu__link:last-child {
    border-bottom: none;
  }

  .hero {
    min-height: auto;
    padding: 70px 0;
  }

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

  .hero-content p {
    font-size: 16px;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 36px;
  }

  .hero-stat strong {
    font-size: 26px;
  }

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

  .intro-image img {
    height: 300px;
  }

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

  .news-item {
    flex-direction: column;
    padding: 20px;
    gap: 12px;
  }

  .news-item__read {
    padding-top: 0;
  }

  .steps-grid {
    gap: 16px;
  }

  .step-item {
    padding: 20px 12px;
  }

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

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

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

  .section-header h2 {
    font-size: 28px;
  }

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

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

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

  .hero-content h1 {
    font-size: 30px;
  }

  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

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

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

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .stat-item {
    padding: 20px 12px;
  }

  .stat-item strong {
    font-size: 28px;
  }

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

  .intro-points {
    grid-template-columns: 1fr;
  }

  .cta-buttons {
    flex-direction: column;
    width: 100%;
  }

  .cta-buttons .btn {
    width: 100%;
  }

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

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

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
  }
}

@media (max-width: 380px) {
  .hero-content h1 {
    font-size: 26px;
  }

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

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

/* roulang page: article */
:root {
  --primary: #1a56db;
  --primary-dark: #1e40af;
  --primary-light: #3b82f6;
  --primary-bg: #eff6ff;
  --accent: #f59e0b;
  --accent-dark: #d97706;
  --bg: #f8fafc;
  --white: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --text-lighter: #94a3b8;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --shadow-sm: 0 2px 12px rgba(15,23,42,0.06);
  --shadow-md: 0 6px 28px rgba(15,23,42,0.09);
  --shadow-lg: 0 16px 48px rgba(15,23,42,0.14);
  --transition: all .3s cubic-bezier(.4,0,.2,1);
  --container: 1200px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: var(--font); font-size: 16px; line-height: 1.7; color: var(--text); background: var(--bg); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: var(--transition); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input { font-family: inherit; }
ul, ol { list-style: none; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 88px 0; position: relative; }
.section--light { background: var(--bg); }
.section--white { background: var(--white); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head .eyebrow { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .12em; color: var(--primary); background: var(--primary-bg); padding: 6px 18px; border-radius: 100px; text-transform: uppercase; margin-bottom: 16px; }
.section-head h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; line-height: 1.25; letter-spacing: -0.02em; color: var(--text); }
.section-head p { color: var(--text-light); font-size: 17px; margin-top: 14px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; border-radius: 50px; font-weight: 600; font-size: 15px; line-height: 1.4; transition: var(--transition); border: 2px solid transparent; white-space: nowrap; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 18px rgba(26,86,219,.28); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(26,86,219,.35); }
.btn-outline { border-color: var(--border); color: var(--text); background: var(--white); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-bg); transform: translateY(-2px); }
.btn-accent { background: var(--accent); color: #fff; box-shadow: 0 4px 18px rgba(245,158,11,.28); }
.btn-accent:hover { background: var(--accent-dark); transform: translateY(-2px); }
.btn-lg { padding: 15px 40px; font-size: 16px; }
.site-header { background: var(--white); box-shadow: 0 2px 20px rgba(15,23,42,.06); position: sticky; top: 0; z-index: 100; }
.header-top { border-bottom: 1px solid var(--border-light); }
.header-top__inner { display: flex; align-items: center; justify-content: space-between; height: 76px; gap: 24px; }
.brand-logo { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-logo__icon { width: 42px; height: 42px; border-radius: 12px; background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; box-shadow: 0 6px 16px rgba(26,86,219,.3); }
.brand-logo__name { font-size: 20px; font-weight: 800; color: var(--text); letter-spacing: -0.01em; line-height: 1.2; }
.brand-logo__name span { display: block; font-size: 12px; font-weight: 500; color: var(--text-light); letter-spacing: .08em; }
.header-tools { display: flex; align-items: center; gap: 12px; }
.header-search { display: flex; align-items: center; background: var(--bg); border-radius: 50px; border: 1px solid var(--border); overflow: hidden; transition: var(--transition); }
.header-search:focus-within { border-color: var(--primary); background: #fff; box-shadow: 0 0 0 4px rgba(26,86,219,.08); }
.header-search input { border: none; outline: none; background: transparent; padding: 9px 18px; font-size: 14px; color: var(--text); width: 200px; }
.header-search button { padding: 0 16px; color: var(--text-light); font-size: 14px; transition: var(--transition); }
.header-search button:hover { color: var(--primary); }
.header-menu-btn { display: none; width: 42px; height: 42px; border-radius: 12px; background: var(--bg); align-items: center; justify-content: center; color: var(--text); font-size: 18px; transition: var(--transition); }
.header-menu-btn:hover { background: var(--primary-bg); color: var(--primary); }
.header-nav { background: var(--white); border-bottom: 1px solid var(--border-light); position: relative; }
.nav-menu { display: flex; align-items: center; gap: 4px; min-height: 52px; }
.nav-menu__link { position: relative; display: inline-block; padding: 14px 20px; font-size: 15px; font-weight: 500; color: var(--text-light); border-radius: var(--radius-sm); transition: var(--transition); }
.nav-menu__link::after { content: ''; position: absolute; left: 20px; right: 20px; bottom: 6px; height: 3px; border-radius: 3px; background: var(--primary); transform: scaleX(0); transform-origin: center; transition: transform .3s ease; }
.nav-menu__link:hover { color: var(--primary); background: var(--primary-bg); }
.nav-menu__link:hover::after { transform: scaleX(1); }
.nav-menu__link.active { color: var(--primary); font-weight: 600; background: var(--primary-bg); }
.nav-menu__link.active::after { transform: scaleX(1); }
.page-banner { position: relative; padding: 80px 0 72px; background-color: var(--primary-dark); background-image: linear-gradient(rgba(15,23,42,.72), rgba(15,23,42,.72)), url('/assets/images/backpic/back-2.png'); background-size: cover; background-position: center; color: #fff; }
.page-banner::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 70px; background: linear-gradient(to top, rgba(15,23,42,.4), transparent); pointer-events: none; }
.page-banner .container { position: relative; z-index: 2; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 14px; color: rgba(255,255,255,.72); margin-bottom: 20px; flex-wrap: wrap; }
.breadcrumb a { color: rgba(255,255,255,.82); transition: var(--transition); }
.breadcrumb a:hover { color: #fff; text-decoration: underline; }
.breadcrumb i { font-size: 11px; opacity: .6; }
.page-banner h1 { font-size: clamp(28px, 4.5vw, 44px); font-weight: 800; line-height: 1.3; letter-spacing: -0.02em; max-width: 860px; text-shadow: 0 2px 20px rgba(0,0,0,.2); }
.page-banner .banner-meta { display: flex; align-items: center; gap: 20px; margin-top: 24px; flex-wrap: wrap; font-size: 14px; color: rgba(255,255,255,.86); }
.page-banner .banner-meta span { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,.14); padding: 6px 16px; border-radius: 50px; backdrop-filter: blur(8px); }
.page-banner .banner-meta i { font-size: 13px; }
.article-section { padding: 64px 0 88px; }
.article-layout { display: grid; grid-template-columns: minmax(0,1fr) 340px; gap: 40px; align-items: start; }
.article-body { min-width: 0; }
.article-card { background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); overflow: hidden; }
.article-card__inner { padding: 44px 48px; }
.article-lead { font-size: 18px; line-height: 1.8; color: var(--text-light); padding: 20px 24px; background: var(--primary-bg); border-left: 4px solid var(--primary); border-radius: 0 var(--radius-md) var(--radius-md) 0; margin-bottom: 32px; }
.article-content { font-size: 16.5px; line-height: 1.9; color: var(--text); }
.article-content h2 { font-size: 26px; font-weight: 700; margin: 40px 0 16px; padding-bottom: 12px; border-bottom: 2px solid var(--border-light); letter-spacing: -0.01em; }
.article-content h3 { font-size: 21px; font-weight: 700; margin: 30px 0 14px; color: var(--text); }
.article-content p { margin-bottom: 18px; }
.article-content ul, .article-content ol { margin: 0 0 20px 24px; }
.article-content ul { list-style: disc; }
.article-content ol { list-style: decimal; }
.article-content li { margin-bottom: 8px; padding-left: 4px; }
.article-content blockquote { margin: 24px 0; padding: 22px 28px; background: var(--bg); border-left: 4px solid var(--primary); border-radius: 0 var(--radius-md) var(--radius-md) 0; font-size: 16px; color: var(--text); }
.article-content blockquote::before { content: '\201C'; font-size: 48px; color: var(--primary-light); font-family: Georgia, serif; line-height: 1; display: block; margin-bottom: 6px; }
.article-content img { border-radius: var(--radius-md); margin: 24px 0; box-shadow: var(--shadow-sm); }
.article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
.article-content a:hover { color: var(--primary-dark); }
.article-content code { background: var(--bg); padding: 2px 8px; border-radius: 6px; font-size: 14px; font-family: 'SFMono-Regular', Consolas, monospace; color: var(--primary-dark); }
.article-content table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 15px; }
.article-content th, .article-content td { border: 1px solid var(--border); padding: 12px 16px; text-align: left; }
.article-content th { background: var(--primary-bg); font-weight: 600; color: var(--primary-dark); }
.article-not-found { text-align: center; padding: 70px 40px; }
.article-not-found i { font-size: 52px; color: var(--text-lighter); margin-bottom: 20px; display: block; }
.article-not-found h2 { font-size: 28px; font-weight: 700; margin-bottom: 12px; }
.article-not-found p { color: var(--text-light); margin-bottom: 24px; }
.article-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 40px; padding-top: 28px; border-top: 1px solid var(--border-light); }
.article-tags .tag { display: inline-flex; align-items: center; gap: 6px; padding: 6px 16px; background: var(--bg); border-radius: 50px; font-size: 13px; color: var(--text-light); transition: var(--transition); border: 1px solid var(--border); }
.article-tags .tag:hover { background: var(--primary-bg); color: var(--primary); border-color: var(--primary-light); }
.article-tags .tag i { font-size: 11px; }
.article-sidebar { position: sticky; top: 140px; display: flex; flex-direction: column; gap: 28px; }
.sidebar-card { background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); padding: 28px; border: 1px solid var(--border-light); }
.sidebar-card__title { font-size: 16px; font-weight: 700; color: var(--text); margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
.sidebar-card__title i { color: var(--primary); font-size: 15px; }
.sidebar-card__title::after { content: ''; flex: 1; height: 1px; background: var(--border-light); }
.sidebar-list-item { display: flex; gap: 14px; padding: 12px 0; border-bottom: 1px solid var(--border-light); transition: var(--transition); }
.sidebar-list-item:last-child { border-bottom: none; padding-bottom: 0; }
.sidebar-list-item:first-child { padding-top: 0; }
.sidebar-list-item .item-num { font-size: 22px; font-weight: 800; color: var(--primary-light); opacity: .5; line-height: 1; min-width: 30px; font-family: Georgia, serif; }
.sidebar-list-item .item-body h4 { font-size: 14px; font-weight: 600; line-height: 1.45; margin-bottom: 4px; color: var(--text); transition: var(--transition); }
.sidebar-list-item .item-body span { font-size: 12px; color: var(--text-lighter); }
.sidebar-list-item:hover .item-body h4 { color: var(--primary); }
.sidebar-cta { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); border: none; color: #fff; position: relative; overflow: hidden; }
.sidebar-cta::before { content: ''; position: absolute; top: -30px; right: -30px; width: 120px; height: 120px; border-radius: 50%; background: rgba(255,255,255,.08); }
.sidebar-cta h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.sidebar-cta p { font-size: 14px; opacity: .85; margin-bottom: 18px; line-height: 1.6; }
.sidebar-cta .btn { background: #fff; color: var(--primary); width: 100%; justify-content: center; box-shadow: none; }
.sidebar-cta .btn:hover { background: var(--primary-bg); transform: translateY(-2px); }
.related-section { background: var(--bg); padding: 80px 0; }
.related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.related-card { display: flex; gap: 20px; background: var(--white); border: 1px solid var(--border-light); border-radius: var(--radius-lg); padding: 20px; box-shadow: var(--shadow-sm); transition: var(--transition); }
.related-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); border-color: var(--primary-light); }
.related-card__img { width: 130px; height: 92px; border-radius: var(--radius-md); object-fit: cover; flex-shrink: 0; }
.related-card__body h4 { font-size: 15px; font-weight: 700; line-height: 1.5; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.related-card__body h4 a:hover { color: var(--primary); }
.related-card__meta { font-size: 12px; color: var(--text-lighter); display: flex; align-items: center; gap: 12px; }
.related-card__meta i { font-size: 11px; color: var(--primary); }
.faq-section { padding: 88px 0; }
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item { background: var(--white); border-radius: var(--radius-md); border: 1px solid var(--border-light); margin-bottom: 16px; box-shadow: var(--shadow-sm); transition: var(--transition); }
.faq-item:hover { box-shadow: var(--shadow-md); }
.faq-item details { padding: 22px 28px; }
.faq-item summary { font-size: 16.5px; font-weight: 600; cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 16px; color: var(--text); }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '\f107'; font-family: 'Font Awesome 6 Free'; font-weight: 900; color: var(--primary); transition: var(--transition); flex-shrink: 0; }
.faq-item details[open] summary::after { transform: rotate(180deg); }
.faq-item .answer { padding-top: 16px; margin-top: 14px; border-top: 1px solid var(--border-light); color: var(--text-light); font-size: 15px; line-height: 1.75; }
.cta-band { background: linear-gradient(rgba(15,23,42,.82), rgba(15,23,42,.82)), url('/assets/images/backpic/back-3.png'); background-size: cover; background-position: center; padding: 80px 0; text-align: center; color: #fff; }
.cta-band h2 { font-size: clamp(28px, 4vw, 38px); font-weight: 800; margin-bottom: 16px; letter-spacing: -0.02em; }
.cta-band p { font-size: 17px; color: rgba(255,255,255,.82); max-width: 600px; margin: 0 auto 30px; }
.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.site-footer { background: #0f172a; color: #94a3b8; padding-top: 70px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 60px; padding-bottom: 48px; }
.footer-brand .brand-logo { margin-bottom: 18px; }
.footer-brand .brand-logo__name { color: #fff; }
.footer-brand .brand-logo__name span { color: #64748b; }
.footer-brand p { font-size: 14px; line-height: 1.8; max-width: 360px; color: #64748b; }
.footer-col h4 { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 22px; letter-spacing: .04em; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul a { font-size: 14px; color: #64748b; transition: var(--transition); position: relative; padding-left: 0; }
.footer-col ul a:hover { color: var(--primary-light); padding-left: 8px; }
.footer-col ul a i { margin-right: 8px; font-size: 12px; }
.footer-bottom { border-top: 1px solid rgba(148,163,184,.15); padding: 24px 0; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 13px; color: #64748b; }
.footer-links { display: flex; align-items: center; gap: 18px; }
.footer-links a { color: #64748b; transition: var(--transition); }
.footer-links a:hover { color: var(--primary-light); }
.footer-links i { margin-right: 4px; }
@media (max-width: 1024px) {
  .section { padding: 70px 0; }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-grid { gap: 36px; }
  .header-search input { width: 150px; }
}
@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .header-search { display: none; }
  .header-menu-btn { display: flex; }
  .header-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--white); box-shadow: var(--shadow-lg); border-bottom: 1px solid var(--border-light); }
  .header-nav.open { display: block; }
  .nav-menu { flex-direction: column; align-items: stretch; padding: 12px; gap: 4px; }
  .nav-menu__link { padding: 14px 18px; }
  .nav-menu__link::after { display: none; }
  .article-card__inner { padding: 28px 22px; }
  .page-banner { padding: 56px 0 48px; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 520px) {
  .container { padding: 0 18px; }
  .header-top__inner { height: 66px; }
  .brand-logo__name { font-size: 17px; }
  .brand-logo__icon { width: 36px; height: 36px; font-size: 15px; }
  .section { padding: 44px 0; }
  .section-head { margin-bottom: 36px; }
  .section-head h2 { font-size: 26px; }
  .page-banner { padding: 40px 0 40px; }
  .page-banner h1 { font-size: 24px; }
  .banner-meta { gap: 10px !important; }
  .banner-meta span { padding: 5px 12px !important; font-size: 12px !important; }
  .article-card__inner { padding: 22px 18px; }
  .article-lead { font-size: 16px; padding: 16px 18px; }
  .article-content { font-size: 15.5px; }
  .article-content h2 { font-size: 22px; }
  .article-content h3 { font-size: 18px; }
  .related-card { flex-direction: column; }
  .related-card__img { width: 100%; height: 160px; }
  .cta-band { padding: 56px 0; }
  .cta-buttons .btn { width: 100%; justify-content: center; }
  .article-sidebar { grid-template-columns: 1fr; }
  .faq-item details { padding: 18px 20px; }
}

/* roulang page: category1 */
/* ========== 设计变量 ========== */
    :root {
      --primary: #1d5cff;
      --primary-dark: #0d3ea8;
      --primary-light: #e8efff;
      --accent: #12b8a6;
      --dark: #0b1930;
      --dark-2: #112542;
      --bg: #f5f8fc;
      --bg-gray: #edf2f8;
      --white: #ffffff;
      --text: #152338;
      --text-muted: #5c6b83;
      --border: #dde7f2;
      --radius: 16px;
      --radius-sm: 10px;
      --shadow: 0 14px 36px rgba(13, 42, 92, 0.08);
      --shadow-lg: 0 24px 60px rgba(13, 42, 92, 0.13);
      --transition: all 0.25s ease;
      --container: 1200px;
    }

    /* ========== 基础 Reset ========== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      font-size: 16px;
      line-height: 1.75;
      color: var(--text);
      background: var(--bg);
      -webkit-font-smoothing: antialiased;
    }
    a { color: var(--primary); text-decoration: none; transition: var(--transition); }
    a:hover { color: var(--primary-dark); }
    img { display: block; max-width: 100%; }
    button, input { font-family: inherit; }
    ul, ol { list-style: none; }
    .container { width: min(var(--container), 92%); margin: 0 auto; }
    .section { padding: 88px 0; }
    .section--gray { background: var(--bg-gray); }

    /* ========== 版头 / 导航 ========== */
    .site-header { position: sticky; top: 0; z-index: 100; background: var(--white); box-shadow: 0 2px 16px rgba(13, 42, 92, 0.06); }
    .header-top { background: var(--white); }
    .header-top__inner { display: flex; align-items: center; justify-content: space-between; height: 74px; gap: 20px; }
    .brand-logo { display: inline-flex; align-items: center; gap: 12px; flex-shrink: 0; }
    .brand-logo__icon { width: 42px; height: 42px; border-radius: 12px; background: linear-gradient(135deg, var(--primary), #3b82f6); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; box-shadow: 0 8px 18px rgba(29, 92, 255, 0.28); }
    .brand-logo__name { font-size: 20px; font-weight: 800; letter-spacing: 0.5px; color: var(--text); }
    .brand-logo__name span { color: var(--primary); margin-left: 2px; }
    .header-tools { display: flex; align-items: center; gap: 16px; }
    .header-search { display: flex; align-items: center; background: var(--bg-gray); border: 1px solid var(--border); border-radius: 999px; padding: 4px 6px 4px 16px; width: 280px; transition: var(--transition); }
    .header-search:focus-within { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(29, 92, 255, 0.12); }
    .header-search input { flex: 1; border: none; outline: none; background: transparent; font-size: 14px; color: var(--text); }
    .header-search button { width: 34px; height: 34px; border-radius: 50%; border: none; background: var(--primary); color: #fff; cursor: pointer; font-size: 13px; transition: var(--transition); }
    .header-search button:hover { background: var(--primary-dark); }
    .header-menu-btn { display: none; width: 42px; height: 42px; border-radius: 12px; border: 1px solid var(--border); background: var(--white); color: var(--text); font-size: 18px; cursor: pointer; transition: var(--transition); }
    .header-menu-btn:hover { border-color: var(--primary); color: var(--primary); }

    .header-nav { background: var(--dark); min-height: 0; transition: max-height 0.3s ease; }
    .nav-menu { display: flex; gap: 4px; flex-wrap: wrap; padding: 8px 0; }
    .nav-menu__link { display: inline-flex; align-items: center; gap: 6px; padding: 9px 18px; border-radius: 999px; color: #b7c6dc; font-size: 15px; font-weight: 500; transition: var(--transition); }
    .nav-menu__link:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }
    .nav-menu__link.active { color: #fff; background: var(--primary); box-shadow: 0 8px 18px rgba(29, 92, 255, 0.30); }

    /* ========== 内页 Hero ========== */
    .hero--inner { position: relative; padding: 108px 0 120px; background-size: cover; background-position: center 30%; color: #fff; isolation: isolate; }
    .hero--inner::before { content: ""; position: absolute; inset: 0; background: linear-gradient(100deg, rgba(5, 16, 38, 0.94) 10%, rgba(13, 40, 92, 0.78) 55%, rgba(29, 92, 255, 0.55)); z-index: -1; }
    .hero__badge { display: inline-flex; align-items: center; gap: 8px; padding: 7px 16px; border: 1px solid rgba(255, 255, 255, 0.35); border-radius: 999px; backdrop-filter: blur(4px); font-size: 14px; letter-spacing: 1px; background: rgba(255, 255, 255, 0.12); }
    .hero--inner h1 { font-size: 44px; line-height: 1.25; font-weight: 800; margin: 22px 0 18px; max-width: 720px; }
    .hero--inner h1 span { color: #8ec5ff; }
    .hero--inner .hero__desc { max-width: 600px; color: rgba(255, 255, 255, 0.82); font-size: 17px; margin-bottom: 34px; }
    .hero__actions { display: flex; flex-wrap: wrap; gap: 14px; }
    .hero__meta { display: flex; flex-wrap: wrap; gap: 30px; margin-top: 50px; padding-top: 34px; border-top: 1px solid rgba(255, 255, 255, 0.18); width: 100%; max-width: 800px; }
    .hero__meta-item { display: flex; align-items: center; gap: 12px; }
    .hero__meta-item i { width: 40px; height: 40px; border-radius: 10px; background: rgba(255, 255, 255, 0.12); display: flex; align-items: center; justify-content: center; font-size: 16px; color: #9dd4ff; }
    .hero__meta-item strong { display: block; font-size: 16px; line-height: 1.3; }
    .hero__meta-item span { font-size: 13px; color: rgba(255, 255, 255, 0.7); }

    /* ========== 按钮 ========== */
    .btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 24px; border-radius: 999px; font-size: 15px; font-weight: 600; border: 1px solid transparent; cursor: pointer; transition: var(--transition); }
    .btn--primary { background: var(--primary); color: #fff; box-shadow: 0 10px 24px rgba(29, 92, 255, 0.28); }
    .btn--primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 14px 30px rgba(29, 92, 255, 0.35); }
    .btn--ghost { background: rgba(255, 255, 255, 0.10); color: #fff; border-color: rgba(255, 255, 255, 0.35); backdrop-filter: blur(4px); }
    .btn--ghost:hover { background: rgba(255, 255, 255, 0.20); color: #fff; }
    .btn--lg { padding: 15px 36px; font-size: 16px; }
    .btn--outline { background: transparent; color: var(--primary); border-color: var(--primary); }
    .btn--outline:hover { background: var(--primary); color: #fff; }

    /* ========== 版块标题 ========== */
    .section-head { text-align: center; max-width: 760px; margin: 0 auto 54px; }
    .section-head__tag { display: inline-block; padding: 6px 16px; border-radius: 999px; background: var(--primary-light); color: var(--primary); font-size: 13px; font-weight: 700; letter-spacing: 1px; margin-bottom: 14px; }
    .section-head h2 { font-size: 34px; font-weight: 800; line-height: 1.35; color: var(--text); }
    .section-head p { color: var(--text-muted); font-size: 16px; margin-top: 12px; }

    /* ========== 核心能力卡片 ========== */
    .feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
    .feature-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px 26px 30px; transition: var(--transition); position: relative; overflow: hidden; }
    .feature-card::after { content: ""; position: absolute; right: -40px; top: -40px; width: 100px; height: 100px; border-radius: 50%; background: radial-gradient(circle, var(--primary-light), transparent 70%); opacity: 0; transition: var(--transition); }
    .feature-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: transparent; }
    .feature-card:hover::after { opacity: 1; }
    .feature-card__icon { width: 56px; height: 56px; border-radius: 14px; background: linear-gradient(135deg, var(--primary-light), #e2edff); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 22px; margin-bottom: 20px; transition: var(--transition); }
    .feature-card:hover .feature-card__icon { background: var(--primary); color: #fff; }
    .feature-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
    .feature-card p { color: var(--text-muted); font-size: 14px; line-height: 1.7; }
    .feature-card__link { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; font-size: 14px; font-weight: 600; }
    .feature-card__link i { transition: transform 0.2s; }
    .feature-card__link:hover i { transform: translateX(4px); }

    /* ========== 数据指标深色带 ========== */
    .stats-band { background: linear-gradient(120deg, var(--dark) 0%, var(--dark-2) 100%); padding: 76px 0; color: #fff; }
    .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 36px; text-align: center; }
    .stat-item { padding: 20px 12px; border-radius: var(--radius); background: rgba(255, 255, 255, 0.04); border: 1px solid rgba(255, 255, 255, 0.08); transition: var(--transition); }
    .stat-item:hover { background: rgba(255, 255, 255, 0.08); transform: translateY(-4px); }
    .stat-item strong { display: block; font-size: 40px; font-weight: 800; line-height: 1.2; background: linear-gradient(90deg, #78b0ff, #35e0c6); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
    .stat-item span { display: block; margin-top: 10px; color: rgba(255, 255, 255, 0.7); font-size: 14px; }

    /* ========== 安全流程步骤 ========== */
    .steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; position: relative; }
    .steps-grid::before { content: ""; position: absolute; top: 60px; left: 8%; right: 8%; height: 2px; background: linear-gradient(90deg, var(--primary-light), var(--primary), var(--accent)); opacity: 0.5; }
    .step-card { background: var(--white); border-radius: var(--radius); border: 1px solid var(--border); padding: 30px 26px 34px; text-align: center; position: relative; transition: var(--transition); }
    .step-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
    .step-card__num { position: absolute; top: -14px; right: 24px; width: 34px; height: 34px; border-radius: 50%; background: var(--primary); color: #fff; font-size: 13px; font-weight: 700; display: flex; align-items: center; justify-content: center; box-shadow: 0 8px 18px rgba(29, 92, 255, 0.30); }
    .step-card__icon { width: 60px; height: 60px; margin: 0 auto 18px; border-radius: 50%; background: var(--primary-light); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 22px; }
    .step-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
    .step-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }
    .step-card__time { display: inline-block; margin-top: 14px; font-size: 12px; color: var(--accent); font-weight: 600; background: rgba(18, 184, 166, 0.10); padding: 4px 12px; border-radius: 999px; }

    /* ========== 子主题入口网格 ========== */
    .topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .topic-card { position: relative; border-radius: var(--radius); overflow: hidden; min-height: 240px; display: flex; align-items: flex-end; box-shadow: var(--shadow); transition: var(--transition); }
    .topic-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
    .topic-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(9, 22, 46, 0.10) 0%, rgba(9, 22, 46, 0.82) 100%); }
    .topic-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
    .topic-card:hover img { transform: scale(1.08); }
    .topic-card__content { position: relative; z-index: 1; color: #fff; padding: 26px; width: 100%; }
    .topic-card__content h3 { font-size: 20px; font-weight: 700; margin-bottom: 6px; }
    .topic-card__content p { font-size: 13px; color: rgba(255, 255, 255, 0.8); line-height: 1.7; }
    .topic-card__more { display: inline-flex; align-items: center; gap: 6px; margin-top: 12px; font-size: 13px; font-weight: 600; color: #9dd4ff; }
    .topic-card__more i { transition: transform 0.2s; }
    .topic-card:hover .topic-card__more i { transform: translateX(4px); }

    /* ========== 资讯卡片 ========== */
    .news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .news-card { background: var(--white); border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; transition: var(--transition); display: flex; flex-direction: column; }
    .news-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
    .news-card__img { height: 180px; overflow: hidden; position: relative; }
    .news-card__img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
    .news-card:hover .news-card__img img { transform: scale(1.06); }
    .news-card__tag { position: absolute; left: 16px; top: 14px; background: var(--primary); color: #fff; font-size: 12px; font-weight: 600; padding: 5px 12px; border-radius: 999px; }
    .news-card__body { padding: 22px 22px 24px; display: flex; flex-direction: column; flex: 1; }
    .news-card__body h3 { font-size: 17px; font-weight: 700; line-height: 1.5; margin-bottom: 10px; }
    .news-card__body h3 a { color: var(--text); }
    .news-card__body h3 a:hover { color: var(--primary); }
    .news-card__body p { font-size: 14px; color: var(--text-muted); flex: 1; }
    .news-card__meta { display: flex; align-items: center; gap: 8px; margin-top: 16px; font-size: 13px; color: var(--text-muted); }
    .news-card__meta time { display: inline-flex; align-items: center; gap: 6px; }

    /* ========== FAQ ========== */
    .faq-list { max-width: 820px; margin: 0 auto; }
    .faq-item { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 14px; overflow: hidden; transition: var(--transition); }
    .faq-item.open { box-shadow: var(--shadow); border-color: rgba(29, 92, 255, 0.25); }
    .faq-item__head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 24px; cursor: pointer; font-size: 16px; font-weight: 600; color: var(--text); transition: var(--transition); }
    .faq-item__head:hover { color: var(--primary); }
    .faq-item__head i { width: 30px; height: 30px; border-radius: 50%; background: var(--primary-light); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 14px; transition: var(--transition); flex-shrink: 0; }
    .faq-item.open .faq-item__head i { background: var(--primary); color: #fff; transform: rotate(45deg); }
    .faq-item__body { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
    .faq-item__body p { padding: 0 24px 22px; color: var(--text-muted); font-size: 15px; line-height: 1.8; }

    /* ========== CTA ========== */
    .cta { position: relative; padding: 80px 0; background: url('/assets/images/backpic/back-3.png') center/cover no-repeat; isolation: isolate; }
    .cta::before { content: ""; position: absolute; inset: 0; background: linear-gradient(105deg, rgba(6, 18, 44, 0.95), rgba(13, 62, 168, 0.78)); z-index: -1; }
    .cta__inner { text-align: center; color: #fff; }
    .cta__inner h2 { font-size: 38px; font-weight: 800; margin-bottom: 14px; }
    .cta__inner p { color: rgba(255, 255, 255, 0.85); font-size: 17px; margin-bottom: 30px; }
    .cta__inner .btn { margin: 0 6px; }

    /* ========== 页脚 ========== */
    .site-footer { background: var(--dark); color: #b8c6d9; }
    .site-footer .container { padding: 68px 0 28px; }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 44px; }
    .footer-brand .brand-logo__name { color: #fff; }
    .footer-brand p { font-size: 14px; line-height: 1.8; margin-top: 18px; max-width: 360px; }
    .footer-col h4 { color: #fff; font-size: 16px; font-weight: 700; margin-bottom: 16px; }
    .footer-col ul li { margin-bottom: 10px; }
    .footer-col ul a { color: #8ea1b9; font-size: 14px; transition: var(--transition); }
    .footer-col ul a:hover { color: #fff; }
    .footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 44px; padding-top: 22px; border-top: 1px solid rgba(255, 255, 255, 0.10); font-size: 13px; color: #7689a3; }
    .footer-links { display: flex; align-items: center; gap: 18px; }
    .footer-links a { color: #7689a3; }
    .footer-links a:hover { color: #fff; }

    /* ========== 响应式 ========== */
    @media (max-width: 1024px) {
      .feature-grid { grid-template-columns: repeat(2, 1fr); }
      .steps-grid { grid-template-columns: repeat(2, 1fr); row-gap: 40px; }
      .steps-grid::before { display: none; }
      .topic-grid { grid-template-columns: repeat(2, 1fr); }
      .news-grid { grid-template-columns: repeat(2, 1fr); }
      .header-search { width: 220px; }
    }

    @media (max-width: 768px) {
      .section { padding: 60px 0; }
      .header-top__inner { height: 64px; }
      .header-search { display: none; }
      .header-menu-btn { display: inline-flex; align-items: center; justify-content: center; }
      .header-nav { max-height: 0; overflow: hidden; }
      .header-nav.menu-open { max-height: 400px; overflow: visible; }
      .nav-menu { flex-direction: column; gap: 4px; padding: 12px 0; }
      .nav-menu__link { width: 100%; justify-content: flex-start; padding: 12px 16px; border-radius: 10px; }
      .hero--inner { padding: 64px 0 72px; }
      .hero--inner h1 { font-size: 30px; }
      .hero__meta { gap: 18px; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
      .stat-item strong { font-size: 32px; }
      .footer-grid { grid-template-columns: 1fr; gap: 28px; }
      .footer-bottom { flex-direction: column; text-align: center; }
      .cta__inner h2 { font-size: 28px; }
      .section-head h2 { font-size: 28px; }
    }

    @media (max-width: 520px) {
      .feature-grid { grid-template-columns: 1fr; }
      .steps-grid { grid-template-columns: 1fr; }
      .topic-grid { grid-template-columns: 1fr; }
      .news-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; }
      .footer-links { flex-direction: column; gap: 8px; }
      .hero__actions .btn { width: 100%; }
      .header-top__inner { gap: 8px; }
      .brand-logo__name { font-size: 17px; }
      .brand-logo__icon { width: 36px; height: 36px; font-size: 15px; }
    }

    /* ========== 焦点可访问性 ========== */
    a:focus-visible, button:focus-visible, input:focus-visible, .faq-item__head:focus-visible { outline: 3px solid rgba(29, 92, 255, 0.35); outline-offset: 2px; }

/* roulang page: category2 */
/* ========== 设计变量 ========== */
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #dbeafe;
  --secondary: #0ea5e9;
  --accent: #f59e0b;
  --accent-glow: #fbbf24;
  --bg: #f8fafc;
  --bg-alt: #f1f5f9;
  --bg-dark: #0f172a;
  --text: #1e293b;
  --text-weak: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --white: #ffffff;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --shadow: 0 4px 24px rgba(37, 99, 235, 0.08);
  --shadow-hover: 0 12px 40px rgba(37, 99, 235, 0.15);
  --shadow-dark: 0 8px 32px rgba(15, 23, 42, 0.2);
  --shadow-glow: 0 0 0 4px rgba(37, 99, 235, 0.12);
  --transition: all 0.3s ease;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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: var(--transition);
}

a:hover, a:focus {
  color: var(--primary-dark);
  outline: none;
}

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: 14px;
  border: none;
  background: none;
  outline: none;
}

button {
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.45);
  outline-offset: 2px;
  border-radius: 4px;
}

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

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
}

/* ========== 顶部信息导航 ========== */
.top-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.section-header {
  margin-bottom: 48px;
  text-align: center;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.section-header h2 {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text);
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.section-header h2 span {
  color: var(--primary);
  position: relative;
}

.section-header p {
  font-size: 17px;
  color: var(--text-weak);
  line-height: 1.8;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 30px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 14px;
  text-transform: uppercase;
}

@media (max-width: 768px) {
  .section-header {
    margin-bottom: 32px;
    text-align: left;
  }
  .section-header h2 {
    font-size: 28px;
  }
  .section-header p {
    font-size: 15px;
  }
}

/* ========== Header ========== */
.site-header {
  background: var(--white);
  box-shadow: 0 2px 16px rgba(15, 23, 42, 0.06);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-top {
  padding: 16px 0;
}

.header-top__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-logo__icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 18px;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
  transition: var(--transition);
}

.brand-logo:hover .brand-logo__icon {
  transform: rotate(-8deg) scale(1.05);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
}

.brand-logo__name {
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.brand-logo__name span {
  color: var(--primary);
  font-weight: 600;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-search {
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  border-radius: 30px;
  padding: 4px 16px;
  gap: 8px;
  width: 300px;
  transition: var(--transition);
}

.header-search:focus-within {
  background: var(--white);
  box-shadow: var(--shadow-glow);
  border: 1px solid rgba(37, 99, 235, 0.25);
}

.header-search input {
  flex: 1;
  background: transparent;
  padding: 8px 0;
  font-size: 14px;
  color: var(--text);
}

.header-search input::placeholder {
  color: var(--text-light);
}

.header-search button {
  color: var(--primary);
  font-size: 15px;
  transition: var(--transition);
}

.header-search button:hover {
  color: var(--primary-dark);
}

.header-menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--bg-alt);
  color: var(--text);
  font-size: 17px;
  transition: var(--transition);
  align-items: center;
  justify-content: center;
}

.header-menu-btn:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.header-nav {
  border-top: 1px solid var(--border);
  background: var(--white);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0;
  margin: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-menu::-webkit-scrollbar {
  display: none;
}

.nav-menu__link {
  display: block;
  padding: 14px 22px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  border-bottom: 3px solid transparent;
  position: relative;
  white-space: nowrap;
  transition: var(--transition);
}

.nav-menu__link:hover {
  color: var(--primary);
  background: rgba(37, 99, 235, 0.04);
}

.nav-menu__link.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 700;
}

@media (max-width: 768px) {
  .header-search {
    display: none;
  }
  .header-menu-btn {
    display: inline-flex;
  }
  .header-top__inner {
    padding: 6px 0;
  }
  .header-nav {
    display: none;
    border-top: 1px solid var(--border);
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.12);
    max-height: 80vh;
    overflow-y: auto;
  }
  .header-nav.open {
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--white);
    border-radius: 0 0 var(--radius) var(--radius);
  }
  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0;
  }
  .nav-menu__link {
    padding: 14px 24px;
    border-bottom: 1px solid var(--border);
  }
  .nav-menu__link.active {
    border-bottom-color: var(--border);
    background: var(--primary-light);
  }
}

/* ========== 页面横幅 ========== */
.page-banner {
  position: relative;
  padding: 80px 0 64px;
  background:
    linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(37, 99, 235, 0.82) 100%),
    url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  color: var(--white);
  overflow: hidden;
}

.page-banner::after {
  content: '';
  position: absolute;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  top: -140px;
  right: -100px;
  border: 2px solid rgba(255, 255, 255, 0.1);
}

.page-banner__content {
  position: relative;
  z-index: 2;
  max-width: 680px;
}

.page-banner .breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 20px;
}

.page-banner .breadcrumb a {
  color: rgba(255, 255, 255, 0.9);
  padding: 4px 8px;
  border-radius: 6px;
  transition: var(--transition);
}

.page-banner .breadcrumb a:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--white);
}

.page-banner .breadcrumb i {
  font-size: 12px;
}

.page-banner h1 {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.page-banner h1 span {
  color: var(--accent-glow);
  position: relative;
}

.page-banner p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.8;
  margin-bottom: 24px;
}

.page-banner__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-banner__badges .badge {
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: var(--white);
  padding: 6px 14px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  backdrop-filter: blur(8px);
}

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

@media (max-width: 768px) {
  .page-banner {
    padding: 56px 0 44px;
  }
  .page-banner h1 {
    font-size: 30px;
  }
  .page-banner p {
    font-size: 15px;
  }
}

/* ========== 安全能力总览 ========== */
.security-overview {
  padding: 88px 0;
  background: var(--white);
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.security-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

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

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

.security-card__icon {
  width: 68px;
  height: 68px;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--primary-light) 0%, rgba(14, 165, 233, 0.12) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 26px;
  color: var(--primary);
  transition: var(--transition);
}

.security-card:hover .security-card__icon {
  transform: scale(1.06) rotate(3deg);
}

.security-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}

.security-card p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.7;
}

@media (max-width: 992px) {
  .security-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

/* ========== 安全防护措施 ========== */
.security-measures {
  padding: 88px 0;
  background: var(--bg-alt);
  position: relative;
}

.measures-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.measures-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  min-height: 380px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

.measures-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
  opacity: 0.55;
}

.measures-image__overlay {
  position: relative;
  z-index: 2;
  padding: 40px;
  color: var(--white);
  min-height: 380px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  background: linear-gradient(to top, rgba(15, 23, 42, 0.65) 0%, transparent 55%);
}

.measures-image__overlay h3 {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 10px;
}

.measures-image__overlay p {
  font-size: 15px;
  opacity: 0.9;
  line-height: 1.7;
}

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

.measure-item {
  display: flex;
  gap: 18px;
  background: var(--white);
  border-radius: var(--radius);
  padding: 22px 24px;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.measure-item:hover {
  box-shadow: var(--shadow-hover);
  border-color: transparent;
  transform: translateX(4px);
}

.measure-item__icon {
  width: 46px;
  height: 46px;
  background: var(--primary-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 18px;
  flex-shrink: 0;
  transition: var(--transition);
}

.measure-item:hover .measure-item__icon {
  background: var(--primary);
  color: var(--white);
}

.measure-item__content h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.measure-item__content p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.7;
}

@media (max-width: 992px) {
  .measures-layout {
    grid-template-columns: 1fr;
  }
  .measures-image {
    min-height: 300px;
  }
  .measures-image__overlay {
    min-height: 300px;
  }
}

/* ========== 双层安全机制 ========== */
.security-layer {
  padding: 88px 0;
  background: var(--white);
}

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

.layer-card {
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--border);
  position: relative;
  transition: var(--transition);
  counter-increment: layer-count;
}

.layer-card:nth-child(2) {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.06) 0%, rgba(14, 165, 233, 0.12) 100%);
}

.layer-card:nth-child(3) {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.06) 0%, rgba(245, 158, 11, 0.12) 100%);
}

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

.layer-card__badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  background: var(--primary-light);
  color: var(--primary-dark);
  margin-bottom: 18px;
}

.layer-card:nth-child(2) .layer-card__badge {
  background: rgba(14, 165, 233, 0.15);
  color: var(--secondary);
}

.layer-card:nth-child(3) .layer-card__badge {
  background: rgba(245, 158, 11, 0.15);
  color: #b45309;
}

.layer-card h3 {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 12px;
}

.layer-card p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.8;
  margin-bottom: 20px;
}

.layer-card ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.layer-card ul li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text);
  line-height: 1.6;
}

.layer-card ul li i {
  color: var(--primary);
  font-size: 13px;
  margin-top: 4px;
  flex-shrink: 0;
}

@media (max-width: 992px) {
  .layer-grid {
    grid-template-columns: 1fr;
    max-width: 640px;
    margin: 0 auto;
  }
}

/* ========== 安全工具/服务 ========== */
.security-tools {
  padding: 88px 0;
  background: var(--bg-dark);
  color: var(--white);
  position: relative;
}

.security-tools::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    url('/assets/images/backpic/back-3.png') center/cover no-repeat;
  opacity: 0.1;
  pointer-events: none;
}

.security-tools .section-tag {
  background: rgba(255, 255, 255, 0.15);
  color: var(--accent-glow);
}

.security-tools .section-header h2 {
  color: var(--white);
}

.security-tools .section-header p {
  color: rgba(255, 255, 255, 0.7);
}

.tools-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.tool-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}

.tool-card:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-6px);
  border-color: rgba(255, 255, 255, 0.22);
}

.tool-card__icon {
  width: 60px;
  height: 60px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 24px;
  color: var(--accent-glow);
  transition: var(--transition);
}

.tool-card:hover .tool-card__icon {
  background: rgba(245, 158, 11, 0.2);
  transform: scale(1.08);
}

.tool-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}

.tool-card p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.7;
  margin-bottom: 16px;
}

.tool-card__link {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-glow);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.tool-card__link:hover {
  gap: 10px;
  color: var(--accent);
}

@media (max-width: 992px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

/* ========== 安全数据统计 ========== */
.security-stats {
  padding: 88px 0;
  background: var(--white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}

.stat-item {
  text-align: center;
}

.stat-item__num {
  font-size: 46px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
  font-family: 'SF Pro Display', -apple-system, sans-serif;
}

.stat-item__label {
  font-size: 15px;
  color: var(--text-weak);
}

.stat-item__badge {
  display: inline-block;
  margin-top: 8px;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 12px;
  font-weight: 600;
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

/* ========== FAQ ========== */
.faq-section {
  padding: 88px 0;
  background: var(--bg-alt);
}

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

.faq-item {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 0;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  box-shadow: var(--shadow);
  border-color: rgba(37, 99, 235, 0.3);
}

.faq-item__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 28px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  background: var(--white);
  transition: var(--transition);
  text-align: left;
}

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

.faq-item__question i {
  color: var(--primary);
  font-size: 14px;
  transition: var(--transition);
  flex-shrink: 0;
}

.faq-item__question.active i {
  transform: rotate(180deg);
}

.faq-item__question.active {
  color: var(--primary);
}

.faq-item__answer {
  padding: 0 28px;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.35s ease, padding 0.35s ease, opacity 0.3s ease;
  font-size: 15px;
  color: var(--text-weak);
  line-height: 1.8;
}

.faq-item__answer.open {
  max-height: 320px;
  opacity: 1;
  padding: 0 28px 22px;
}

@media (max-width: 768px) {
  .faq-item__question {
    padding: 18px 20px;
    font-size: 15px;
  }
  .faq-item__answer {
    padding: 0 20px;
  }
  .faq-item__answer.open {
    padding: 0 20px 18px;
    font-size: 14px;
  }
}

/* ========== CTA ========== */
.cta-section {
  padding: 76px 0;
  background:
    linear-gradient(135deg, rgba(15, 23, 42, 0.9) 0%, rgba(37, 99, 235, 0.85) 100%),
    url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  color: var(--white);
}

.cta-inner {
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
}

.cta-inner h2 {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-inner p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: 28px;
  line-height: 1.8;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 700;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--white);
  color: var(--primary-dark);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.2);
  color: var(--primary);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255, 255, 255, 0.4);
}

.btn-outline:hover {
  border-color: var(--white);
  background: rgba(255, 255, 255, 0.1);
}

@media (max-width: 768px) {
  .cta-inner h2 {
    font-size: 28px;
  }
  .cta-inner p {
    font-size: 15px;
  }
}

/* ========== 相关资讯 ========== */
.related-news {
  padding: 88px 0;
  background: var(--white);
}

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

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

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

.news-card__img {
  height: 190px;
  background: var(--bg-alt);
  position: relative;
  overflow: hidden;
}

.news-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.news-card:hover .news-card__img img {
  transform: scale(1.05);
}

.news-card__body {
  padding: 22px 24px;
}

.news-card__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 12px;
}

.news-card__meta span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.news-card__meta i {
  color: var(--primary);
  font-size: 12px;
}

.news-card h3 {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 10px;
}

.news-card h3 a {
  color: var(--text);
}

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

.news-card p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.7;
  margin-bottom: 14px;
}

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

.news-card__link:hover {
  gap: 12px;
  color: var(--primary-dark);
}

@media (max-width: 992px) {
  .news-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .news-grid {
    grid-template-columns: 1fr;
  }
}

/* ========== Footer ========== */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 64px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand .brand-logo {
  margin-bottom: 18px;
}

.footer-brand .brand-logo__name {
  color: var(--white);
}

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

.footer-col h4 {
  color: var(--white);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

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

.footer-col ul li a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-col ul li a:hover {
  color: var(--accent-glow);
  transform: translateX(4px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 14px;
}

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

.footer-links {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-links span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

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

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ========== 顶部返回 ========== */
.back-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--primary);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: var(--shadow);
  z-index: 99;
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
}

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

.back-top:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}