/* roulang page: index */
/* ========== 设计变量 ========== */
:root {
  --primary: #0b1220;
  --primary-light: #141e30;
  --primary-lighter: #1e2a3d;
  --accent: #00d4ff;
  --accent-dark: #0090d4;
  --accent-orange: #f97316;
  --bg: #f0f4f8;
  --bg-alt: #e5ecf3;
  --card: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border: #dde5ef;
  --radius: 18px;
  --radius-sm: 12px;
  --radius-lg: 28px;
  --shadow-sm: 0 2px 10px rgba(2, 12, 27, 0.06);
  --shadow-md: 0 6px 30px rgba(2, 12, 27, 0.08);
  --shadow-lg: 0 14px 44px rgba(2, 12, 27, 0.12);
  --shadow-accent: 0 4px 18px rgba(0, 212, 255, 0.25);
  --section-pad: 88px;
  --header-h: 72px;
}

/* ========== Reset / Base ========== */
*,
*::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;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.22s ease, background 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease, transform 0.22s ease;
}

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

ul,
ol {
  list-style: none;
}

input,
textarea {
  font-family: inherit;
}

/* 焦点可访问性 */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ========== 容器 ========== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 768px) {
  .container {
    padding: 0 18px;
  }
}

/* ========== Header 导航 ========== */
.site-header {
  position: sticky;
  top: 14px;
  z-index: 100;
  padding: 0 16px;
  background: transparent;
}

.nav-container {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  background: rgba(11, 18, 32, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  box-shadow: 0 10px 36px rgba(2, 12, 27, 0.2);
  transition: box-shadow 0.25s ease;
}

.nav-container:hover {
  box-shadow: 0 12px 42px rgba(2, 12, 27, 0.24);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.3px;
  white-space: nowrap;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(0, 212, 255, 0.3);
}

.logo-text .logo-highlight {
  color: var(--accent);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  color: rgba(255, 255, 255, 0.75);
  font-size: 14.5px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 10px;
  transition: all 0.22s ease;
  position: relative;
}

.nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.nav-link.active {
  color: var(--accent);
  background: rgba(0, 212, 255, 0.12);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle {
  display: none;
  color: #fff;
  font-size: 20px;
  padding: 8px 12px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.14);
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: 12px;
  font-size: 15px;
  padding: 12px 24px;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.25s ease;
  line-height: 1.4;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  box-shadow: var(--shadow-accent);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 26px rgba(0, 212, 255, 0.38);
  color: #fff;
}

.btn-outline {
  background: transparent;
  border: 1.5px solid rgba(255, 255, 255, 0.55);
  color: #fff;
}

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

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--primary);
  padding: 10px 20px;
  font-size: 14px;
  border-radius: 11px;
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0, 212, 255, 0.06);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
  border-radius: 14px;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13.5px;
  border-radius: 10px;
}

.btn-cta {
  background: #fff;
  color: var(--primary);
  padding: 14px 36px;
  border-radius: 14px;
  font-size: 16px;
  font-weight: 700;
  box-shadow: 0 6px 22px rgba(0, 0, 0, 0.14);
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.18);
  color: var(--primary);
}

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 640px;
  display: flex;
  align-items: center;
  padding: 130px 0 80px;
  overflow: hidden;
  background: var(--primary);
  margin: -80px 0 0;
  border-radius: 0 0 40px 40px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(115deg, rgba(11, 18, 32, 0.96) 30%, rgba(11, 18, 32, 0.75) 70%, rgba(11, 18, 32, 0.55)), url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 212, 255, 0.14);
  border: 1px solid rgba(0, 212, 255, 0.3);
  color: var(--accent);
  font-size: 13.5px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 40px;
  margin-bottom: 22px;
}

.hero-badge i {
  font-size: 13px;
}

.hero h1 {
  font-size: 48px;
  line-height: 1.25;
  color: #ffffff;
  font-weight: 800;
  letter-spacing: 0.5px;
  margin-bottom: 14px;
}

.hero h1 .accent-text {
  color: var(--accent);
}

.hero-desc {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.78);
  max-width: 540px;
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

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

.stat-item strong {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
}

.stat-item strong i {
  color: var(--accent);
  font-size: 20px;
  vertical-align: middle;
  margin-left: 2px;
}

.stat-item span {
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.55);
}

/* ========== Section 通用 ========== */
.section {
  padding: var(--section-pad) 0;
}

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

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 18px;
  border-radius: 40px;
  margin-bottom: 14px;
  letter-spacing: 0.5px;
}

.section-head h2 {
  font-size: 34px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.3;
  margin-bottom: 10px;
}

.section-head p {
  font-size: 15.5px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ========== 特性卡片 ========== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 26px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(0, 212, 255, 0.25);
}

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

.feature-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 18px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.12), rgba(0, 144, 212, 0.08));
  color: var(--accent-dark);
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ========== 分类卡片 ========== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.category-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

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

.category-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.45s ease;
}

.category-card:hover img {
  transform: scale(1.04);
}

.category-content {
  padding: 28px;
}

.category-label {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--accent-dark);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.2);
  padding: 4px 14px;
  border-radius: 40px;
  margin-bottom: 12px;
  letter-spacing: 0.4px;
}

.category-content h3 {
  font-size: 21px;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 8px;
}

.category-content p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 18px;
}

.category-card .btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.category-card .btn-ghost i {
  transition: transform 0.22s ease;
}

.category-card .btn-ghost:hover i {
  transform: translateX(4px);
}

/* ========== 最新信息列表 ========== */
.latest-section {
  background: var(--card);
}

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

.latest-card {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  transition: all 0.28s ease;
  position: relative;
}

.latest-card:hover {
  background: #fff;
  border-color: rgba(0, 212, 255, 0.4);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.latest-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.latest-category {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-dark);
  background: rgba(0, 212, 255, 0.1);
  padding: 4px 14px;
  border-radius: 40px;
  border: 1px solid rgba(0, 212, 255, 0.18);
}

.latest-date {
  font-size: 13px;
  color: var(--text-light);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.latest-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.45;
  margin-bottom: 8px;
  transition: color 0.22s ease;
}

.latest-card:hover .latest-title {
  color: var(--accent-dark);
}

.latest-excerpt {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 16px;
  flex: 1;
}

.latest-more {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-dark);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.latest-more i {
  transition: transform 0.22s ease;
}

.latest-card:hover .latest-more i {
  transform: translateX(4px);
}

.empty-list {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  font-size: 15px;
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
}

/* ========== 数据指标 ========== */
.metrics-section {
  background: linear-gradient(130deg, rgba(11, 18, 32, 0.95), rgba(11, 18, 32, 0.85)), url('/assets/images/backpic/back-2.png') center / cover;
  padding: 64px 0;
  position: relative;
}

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

.metric-card {
  text-align: center;
  padding: 32px 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  backdrop-filter: blur(6px);
  transition: all 0.3s ease;
}

.metric-card:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-3px);
}

.metric-card strong {
  display: block;
  font-size: 36px;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 6px;
  background: linear-gradient(135deg, #fff, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.metric-card span {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  font-weight: 500;
}

/* ========== 登录流程 ========== */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}

.process-step {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 26px 30px;
  text-align: center;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  overflow: hidden;
}

.process-step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.step-num {
  position: absolute;
  top: 14px;
  right: 20px;
  font-size: 44px;
  font-weight: 900;
  color: rgba(11, 18, 32, 0.05);
  line-height: 1;
  z-index: 1;
}

.step-icon {
  width: 62px;
  height: 62px;
  margin: 0 auto 18px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 24px;
  box-shadow: 0 6px 20px rgba(0, 212, 255, 0.25);
  position: relative;
  z-index: 2;
}

.process-step h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}

.process-step p {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ========== FAQ ========== */
.faq-container {
  max-width: 820px;
}

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

.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0 24px;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
  overflow: hidden;
}

.faq-item:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-sm);
}

.faq-item summary {
  padding: 18px 0;
  font-weight: 600;
  font-size: 15.5px;
  color: var(--primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  user-select: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '\f078';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  font-size: 14px;
  color: var(--accent-dark);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  transform: rotate(180deg);
}

.faq-item p {
  padding: 0 0 20px;
  color: var(--text-muted);
  font-size: 14.5px;
  line-height: 1.7;
}

/* ========== CTA ========== */
.cta-section {
  padding: 20px 0 80px;
}

.cta-box {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 32px;
  padding: 56px 48px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.cta-box::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.22), transparent 70%);
  border-radius: 50%;
}

.cta-box h2 {
  color: #ffffff;
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.cta-box p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 15px;
  margin-bottom: 28px;
  position: relative;
  z-index: 1;
}

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

/* ========== Footer ========== */
.site-footer {
  background: var(--primary);
  color: rgba(255, 255, 255, 0.65);
  padding: 64px 0 0;
  margin-top: 40px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 44px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .footer-logo {
  display: inline-block;
  color: #fff;
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
}

.footer-logo .accent {
  color: var(--accent);
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  max-width: 300px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-links h4,
.footer-contact h4 {
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  padding: 5px 0;
  transition: color 0.22s ease, padding-left 0.22s ease;
}

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

.footer-contact p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-contact p i {
  color: var(--accent);
  width: 18px;
  text-align: center;
}

.footer-bottom {
  padding: 22px 0;
  text-align: center;
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.35);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  :root {
    --section-pad: 70px;
  }

  .hero h1 {
    font-size: 40px;
  }

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

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

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

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

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

@media (max-width: 768px) {
  :root {
    --section-pad: 56px;
  }

  .site-header {
    top: 8px;
    padding: 0 10px;
  }

  .nav-container {
    height: 58px;
    padding: 0 14px;
    border-radius: 16px;
  }

  .brand-logo {
    font-size: 15px;
  }

  .logo-icon {
    width: 34px;
    height: 34px;
    font-size: 15px;
    border-radius: 10px;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: rgba(11, 18, 32, 0.98);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 10px;
    flex-direction: column;
    gap: 4px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
  }

  .main-nav.open {
    display: flex;
  }

  .nav-link {
    padding: 12px 16px;
    font-size: 15px;
    border-radius: 10px;
    width: 100%;
    text-align: center;
  }

  .nav-toggle {
    display: block;
  }

  .nav-actions .btn-primary {
    display: none;
  }

  .hero {
    min-height: 560px;
    padding: 100px 0 56px;
    margin: -58px 0 0;
    border-radius: 0 0 28px 28px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero-desc {
    font-size: 15.5px;
  }

  .hero-stats {
    gap: 22px;
    padding-top: 24px;
  }

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

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .feature-card {
    padding: 24px 20px;
  }

  .category-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  .section-head h2 {
    font-size: 27px;
  }

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

  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .metric-card strong {
    font-size: 30px;
  }

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

  .cta-box {
    padding: 40px 24px;
    border-radius: 24px;
  }

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

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

  .footer-bottom {
    font-size: 12.5px;
  }
}

@media (max-width: 520px) {
  .container {
    padding: 0 14px;
  }

  .hero h1 {
    font-size: 27px;
  }

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

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

  .hero-stats {
    flex-direction: column;
    gap: 14px;
  }

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

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

  .metric-card {
    padding: 20px 12px;
  }

  .metric-card strong {
    font-size: 26px;
  }

  .latest-card {
    padding: 20px 18px;
  }

  .faq-item {
    padding: 0 18px;
  }

  .footer-brand .footer-logo {
    font-size: 17px;
  }
}

/* roulang page: category1 */
/* ========== 设计变量 ========== */
:root{
  --bg-primary:#0b1120;
  --bg-secondary:#111a2e;
  --bg-body:#0a0e1a;
  --bg-card:rgba(255,255,255,0.035);
  --bg-card-hover:rgba(255,255,255,0.07);
  --bg-input:rgba(255,255,255,0.05);
  --border:rgba(255,255,255,0.08);
  --border-hover:rgba(56,189,248,0.35);
  --text-main:#e6edf7;
  --text-weak:#94a3b8;
  --text-faint:#64748b;
  --accent:#38bdf8;
  --accent-secondary:#00d4aa;
  --warning:#f0b429;
  --danger:#f87171;
  --radius:18px;
  --radius-sm:10px;
  --shadow-xs:0 4px 16px rgba(0,0,0,0.25);
  --shadow:0 20px 60px rgba(0,0,0,0.45);
  --shadow-lg:0 30px 80px rgba(0,0,0,0.55);
  --transition:0.25s ease;
  --container:1280px;
  --header-h:76px;
}

/* ========== 基础 Reset ========== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  background:var(--bg-body);
  color:var(--text-main);
  line-height:1.7;
  font-size:16px;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font-family:inherit}
ul,ol{list-style:none}
h1,h2,h3,h4,h5{line-height:1.35;font-weight:700;letter-spacing:-0.01em}

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

/* ========== 按钮 ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:999px;border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1;transition:all var(--transition);
  white-space:nowrap;
}
.btn i{font-size:14px}
.btn-sm{padding:9px 18px;font-size:14px}
.btn-lg{padding:16px 32px;font-size:16px}
.btn-primary{
  background:linear-gradient(135deg,var(--accent),var(--accent-secondary));
  color:#0b1120;
  box-shadow:0 8px 24px rgba(56,189,248,0.25);
}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 12px 32px rgba(56,189,248,0.4);
}
.btn-primary:active{transform:translateY(0);box-shadow:0 4px 14px rgba(56,189,248,0.3)}
.btn-outline{
  border-color:var(--border-hover);
  color:var(--accent);
  background:rgba(56,189,248,0.06);
}
.btn-outline:hover{
  background:rgba(56,189,248,0.15);
  border-color:var(--accent);
  transform:translateY(-2px);
}
.btn-outline:active{transform:translateY(0)}
.btn-ghost{
  color:var(--text-weak);
  border-color:var(--border);
  background:transparent;
}
.btn-ghost:hover{color:var(--text-main);border-color:var(--text-weak);background:var(--bg-card)}
.btn:focus-visible,.nav-link:focus-visible,.faq-question:focus-visible,.category-card:focus-visible{
  outline:2px solid var(--accent);outline-offset:3px;
}

/* ========== 徽章 / 标签 ========== */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 14px;border-radius:999px;
  font-size:13px;font-weight:600;
  background:rgba(56,189,248,0.12);
  color:var(--accent);
  border:1px solid rgba(56,189,248,0.25);
}
.badge-warning{
  background:rgba(240,180,41,0.12);
  color:var(--warning);
  border-color:rgba(240,180,41,0.25);
}
.badge-success{
  background:rgba(0,212,170,0.12);
  color:var(--accent-secondary);
  border-color:rgba(0,212,170,0.25);
}
.badge-danger{
  background:rgba(248,113,113,0.12);
  color:var(--danger);
  border-color:rgba(248,113,113,0.25);
}

/* ========== 顶部导航 ========== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(11,17,32,0.82);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
  transition:background var(--transition);
}
.nav-container{
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
  height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.brand-logo{
  display:flex;align-items:center;gap:12px;
  font-size:20px;font-weight:700;color:var(--text-main);
  flex-shrink:0;
}
.logo-icon{
  width:42px;height:42px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--accent),var(--accent-secondary));
  color:#0b1120;font-size:18px;
  box-shadow:0 6px 20px rgba(56,189,248,0.3);
}
.logo-text{letter-spacing:-0.01em}
.logo-highlight{color:var(--accent)}
.main-nav{display:flex;align-items:center;gap:6px}
.nav-link{
  padding:10px 16px;border-radius:10px;
  color:var(--text-weak);font-size:15px;font-weight:500;
  transition:all var(--transition);border:1px solid transparent;
}
.nav-link:hover{color:var(--text-main);background:var(--bg-card);border-color:var(--border)}
.nav-link.active{
  color:var(--accent);background:rgba(56,189,248,0.1);
  border-color:rgba(56,189,248,0.2);
}
.nav-actions{display:flex;align-items:center;gap:12px}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:10px;
  background:var(--bg-card);border:1px solid var(--border);
  color:var(--text-main);font-size:16px;
  align-items:center;justify-content:center;
  transition:all var(--transition);
}
.nav-toggle:hover{background:var(--bg-card-hover);border-color:var(--border-hover)}

/* ========== 页面横幅 Banner ========== */
.page-banner{
  position:relative;
  padding:100px 0 90px;
  background:linear-gradient(135deg,rgba(11,17,32,0.92),rgba(17,26,46,0.78)),url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  border-bottom:1px solid var(--border);
}
.page-banner::after{
  content:"";
  position:absolute;inset:auto 0 0 0;height:80px;
  background:linear-gradient(to top,var(--bg-body),transparent);
  pointer-events:none;
}
.banner-inner{
  display:grid;grid-template-columns:1.2fr 0.8fr;gap:48px;align-items:center;
}
.banner-copy .badge{margin-bottom:20px}
.banner-copy h1{
  font-size:44px;line-height:1.2;margin:18px 0 20px;
  letter-spacing:-0.02em;
}
.banner-copy h1 .gradient-text{
  background:linear-gradient(90deg,var(--accent),var(--accent-secondary));
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;
}
.banner-copy p{font-size:17px;color:var(--text-weak);max-width:540px;margin-bottom:28px}
.banner-actions{display:flex;gap:14px;flex-wrap:wrap}
.banner-stats{
  display:grid;grid-template-columns:repeat(3,1fr);gap:16px;
}
.stat-card{
  background:rgba(255,255,255,0.04);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:24px 18px;
  text-align:center;
  backdrop-filter:blur(8px);
  transition:all var(--transition);
}
.stat-card:hover{background:var(--bg-card-hover);transform:translateY(-4px);border-color:var(--border-hover)}
.stat-num{
  font-size:28px;font-weight:800;color:var(--accent);
  font-variant-numeric:tabular-nums;line-height:1.2;
}
.stat-label{font-size:13px;color:var(--text-weak);margin-top:8px}

/* ========== 通用板块 ========== */
.section{padding:90px 0}
.section-alt{background:var(--bg-secondary);position:relative}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:48px}
.section-title-wrap{max-width:680px}
.section-title-wrap .badge{margin-bottom:14px}
.section-title{font-size:32px;line-height:1.25;margin-bottom:14px}
.section-title-wrap p{color:var(--text-weak);font-size:16px}
.section-link{color:var(--accent);font-size:15px;font-weight:600;display:inline-flex;align-items:center;gap:8px;transition:all var(--transition);flex-shrink:0}
.section-link:hover{gap:12px}

/* ========== 卡片 ========== */
.card{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:28px;
  transition:all var(--transition);
}
.card:hover{
  background:var(--bg-card-hover);
  border-color:var(--border-hover);
  transform:translateY(-4px);
  box-shadow:var(--shadow-xs);
}
.card-icon{
  width:52px;height:52px;border-radius:14px;
  display:flex;align-items:center;justify-content:center;
  font-size:20px;margin-bottom:18px;
  background:linear-gradient(135deg,rgba(56,189,248,0.15),rgba(0,212,170,0.15));
  color:var(--accent);
  border:1px solid rgba(56,189,248,0.2);
}
.card h3{font-size:18px;margin-bottom:10px}
.card p{color:var(--text-weak);font-size:14px;line-height:1.7}

/* ========== 分类入口卡片 ========== */
.category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.category-card{
  position:relative;overflow:hidden;
  border-radius:var(--radius);
  border:1px solid var(--border);
  background:var(--bg-card);
  min-height:320px;
  display:flex;flex-direction:column;
  transition:all var(--transition);
}
.category-card:hover{
  transform:translateY(-6px);
  border-color:var(--border-hover);
  box-shadow:var(--shadow);
}
.category-card .cover{
  height:170px;overflow:hidden;position:relative;
}
.category-card .cover img{
  width:100%;height:100%;object-fit:cover;
  transition:transform 0.5s ease;
}
.category-card:hover .cover img{transform:scale(1.06)}
.category-card .cover::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(to top,var(--bg-card),rgba(11,17,32,0.15));
}
.category-card .cover .badge{
  position:absolute;left:16px;top:16px;z-index:2;
  background:rgba(11,17,32,0.75);
  backdrop-filter:blur(6px);
}
.category-card-body{padding:22px 22px 26px;display:flex;flex-direction:column;flex:1}
.category-card-body h3{font-size:19px;margin-bottom:8px}
.category-card-body p{color:var(--text-weak);font-size:14px;margin-bottom:16px;flex:1}
.category-card-link{
  display:inline-flex;align-items:center;gap:8px;
  color:var(--accent);font-size:14px;font-weight:600;
  transition:gap var(--transition);
}
.category-card-link:hover{gap:12px}

/* ========== FAQ 手风琴 ========== */
.faq-layout{display:grid;grid-template-columns:0.8fr 1.2fr;gap:40px;align-items:start}
.faq-panel{position:sticky;top:calc(var(--header-h) + 30px);display:flex;flex-direction:column;gap:18px}
.faq-panel-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:26px;
  backdrop-filter:blur(8px);
}
.faq-panel-card .big-num{
  font-size:42px;font-weight:800;
  background:linear-gradient(135deg,var(--accent),var(--accent-secondary));
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;
  line-height:1.1;
}
.faq-panel-card h4{font-size:17px;margin:12px 0 8px}
.faq-panel-card p{color:var(--text-weak);font-size:14px}
.faq-panel-card .btn{margin-top:10px}
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:14px;
  overflow:hidden;
  transition:border-color var(--transition),background var(--transition);
}
.faq-item:hover{border-color:var(--border-hover)}
.faq-item.open{
  border-color:rgba(56,189,248,0.35);
  background:rgba(56,189,248,0.04);
}
.faq-question{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 22px;background:transparent;border:none;
  color:var(--text-main);font-size:16px;font-weight:600;text-align:left;
  transition:color var(--transition);
}
.faq-question:hover{color:var(--accent)}
.faq-question .faq-icon{
  width:32px;height:32px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  background:rgba(56,189,248,0.1);color:var(--accent);
  font-size:13px;transition:transform 0.3s ease,background 0.3s ease;
}
.faq-item.open .faq-icon{
  transform:rotate(45deg);
  background:rgba(56,189,248,0.2);
}
.faq-answer{
  max-height:0;overflow:hidden;
  transition:max-height 0.4s ease;
}
.faq-answer-inner{padding:0 22px 22px;color:var(--text-weak);font-size:15px;line-height:1.8}

/* ========== 数据面板 ========== */
.metrics-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.metric-card{
  background:linear-gradient(145deg,rgba(56,189,248,0.08),rgba(0,212,170,0.04));
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:30px 24px;text-align:center;
  transition:all var(--transition);
}
.metric-card:hover{transform:translateY(-4px);border-color:var(--border-hover);box-shadow:var(--shadow-xs)}
.metric-card .metric-icon{font-size:22px;color:var(--accent);margin-bottom:14px}
.metric-card .metric-value{font-size:32px;font-weight:800;letter-spacing:-0.02em}
.metric-card .metric-label{font-size:13px;color:var(--text-weak);margin-top:8px}

/* ========== 会话 / 聊天面板 ========== */
.support-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.support-card{
  display:flex;align-items:flex-start;gap:18px;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:28px;
  transition:all var(--transition);
}
.support-card:hover{background:var(--bg-card-hover);border-color:var(--border-hover);transform:translateY(-3px)}
.support-card i{
  width:46px;height:46px;border-radius:12px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  background:rgba(56,189,248,0.12);color:var(--accent);font-size:18px;
}
.support-card h3{font-size:17px;margin-bottom:6px}
.support-card p{font-size:14px;color:var(--text-weak)}

/* ========== CTA ========== */
.cta-band{
  position:relative;
  padding:80px 0;text-align:center;
  background:linear-gradient(135deg,rgba(56,189,248,0.15),rgba(0,212,170,0.1)),var(--bg-secondary);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
.cta-band h2{font-size:36px;margin-bottom:14px}
.cta-band p{color:var(--text-weak);max-width:560px;margin:0 auto 30px;font-size:16px}
.cta-actions{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}

/* ========== 页脚 ========== */
.site-footer{
  background:var(--bg-secondary);
  border-top:1px solid var(--border);
  padding:60px 0 24px;
}
.footer-top{
  display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:48px;
  padding-bottom:40px;border-bottom:1px solid var(--border);
}
.footer-logo{
  font-size:22px;font-weight:700;color:var(--text-main);
  display:inline-flex;align-items:center;gap:8px;margin-bottom:14px;
}
.footer-logo .accent{color:var(--accent)}
.footer-brand p{color:var(--text-weak);font-size:14px;max-width:320px;margin-top:8px}
.footer-links h4,.footer-contact h4{
  font-size:15px;color:var(--text-main);margin-bottom:18px;
  padding-bottom:10px;border-bottom:1px solid var(--border);
  letter-spacing:0.02em;
}
.footer-links a{
  display:block;color:var(--text-weak);font-size:14px;
  margin-bottom:10px;transition:all var(--transition);
}
.footer-links a:hover{color:var(--accent);padding-left:6px}
.footer-contact p{color:var(--text-weak);font-size:14px;margin-bottom:10px;display:flex;align-items:center;gap:10px}
.footer-contact p i{color:var(--accent);width:18px}
.footer-bottom{
  padding-top:24px;display:flex;align-items:center;justify-content:space-between;
  color:var(--text-faint);font-size:13px;flex-wrap:wrap;gap:12px;
}

/* ========== 响应式 ========== */
@media(max-width:1024px){
  .banner-inner{grid-template-columns:1fr;gap:40px}
  .banner-copy h1{font-size:38px}
  .faq-layout{grid-template-columns:1fr}
  .faq-panel{position:static;flex-direction:row;flex-wrap:wrap}
  .faq-panel-card{flex:1;min-width:220px}
  .category-grid{grid-template-columns:repeat(2,1fr)}
  .metrics-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-container{height:64px;padding:0 16px}
  .main-nav{
    display:none;
    position:absolute;top:100%;left:0;right:0;
    background:rgba(11,17,32,0.97);
    backdrop-filter:blur(14px);
    flex-direction:column;align-items:stretch;
    padding:16px;gap:6px;
    border-bottom:1px solid var(--border);
  }
  .main-nav.open{display:flex}
  .nav-link{text-align:center;padding:14px 16px}
  .nav-toggle{display:flex}
  .nav-actions .btn-sm{display:none}
  .page-banner{padding:70px 0 60px}
  .banner-copy h1{font-size:31px}
  .banner-copy p{font-size:15px}
  .banner-stats{grid-template-columns:repeat(3,1fr);gap:10px}
  .stat-card{padding:16px 10px}
  .stat-num{font-size:22px}
  .stat-label{font-size:12px}
  .section{padding:64px 0}
  .section-head{flex-direction:column;align-items:flex-start;gap:14px;margin-bottom:32px}
  .section-title{font-size:26px}
  .category-grid{grid-template-columns:1fr}
  .support-grid{grid-template-columns:1fr}
  .metrics-grid{grid-template-columns:1fr 1fr}
  .footer-top{grid-template-columns:1fr;gap:32px}
  .footer-bottom{flex-direction:column;text-align:center;justify-content:center}
}
@media(max-width:520px){
  .container{padding:0 16px}
  .brand-logo{font-size:17px}
  .logo-icon{width:36px;height:36px;font-size:16px;border-radius:10px}
  .banner-copy h1{font-size:26px}
  .banner-stats{grid-template-columns:1fr;gap:8px}
  .stat-card{display:flex;align-items:center;justify-content:space-between;text-align:left;padding:14px 16px}
  .stat-num{font-size:24px}
  .stat-label{margin-top:0;font-size:13px}
  .metrics-grid{grid-template-columns:1fr}
  .cta-band h2{font-size:26px}
  .cta-actions .btn{width:100%}
  .faq-question{font-size:15px;padding:18px 16px}
  .faq-answer-inner{padding:0 16px 18px;font-size:14px}
  .card{padding:22px}
  .support-card{flex-direction:column;padding:22px}
  .section-title{font-size:24px}
}

/* roulang page: article */
:root {
  --bg-deep: #070b12;
  --bg-body: #0b101a;
  --bg-nav: #101826;
  --bg-card: #151d2f;
  --bg-card-hover: #1b2538;
  --bg-section: #0e1522;
  --text-hi: #eef2f8;
  --text-mid: #a7b4c8;
  --text-low: #6e7f96;
  --accent: #38bdf8;
  --accent-deep: #0284c7;
  --accent-rgb: 56, 189, 248;
  --accent-warm: #fbbf24;
  --accent-green: #34d399;
  --border: #223049;
  --border-light: #2c3c59;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, .25);
  --shadow-md: 0 10px 28px rgba(0, 0, 0, .35);
  --shadow-glow: 0 0 24px rgba(56, 189, 248, .12);
  --font-main: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-code: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --container-width: 1200px;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-main);
  background: var(--bg-body);
  background-image: radial-gradient(ellipse at 20% 0%, rgba(56, 189, 248, 0.05) 0%, transparent 60%), radial-gradient(ellipse at 90% 10%, rgba(56, 189, 248, 0.03) 0%, transparent 50%);
  color: var(--text-hi);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  max-width: 100%;
  display: block;
}
button {
  font-family: inherit;
  cursor: pointer;
}
input, textarea {
  font-family: inherit;
}
::selection {
  background: rgba(56, 189, 248, 0.3);
  color: #fff;
}
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 14px 20px;
  background: rgba(7, 11, 18, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(34, 48, 73, 0.6);
}
.nav-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 10px 18px;
  background: linear-gradient(135deg, rgba(16, 24, 38, 0.92), rgba(21, 29, 47, 0.85));
  border: 1px solid rgba(44, 60, 89, 0.6);
  border-radius: 18px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.03);
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  transition: opacity .2s ease;
}
.brand-logo:hover {
  opacity: .85;
}
.logo-icon {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  border-radius: 11px;
  color: #fff;
  font-size: 16px;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.35);
}
.logo-text {
  color: var(--text-hi);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .2px;
  white-space: nowrap;
}
.logo-highlight {
  color: var(--accent);
  margin-left: 2px;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.nav-link {
  padding: 9px 16px;
  border-radius: 10px;
  color: var(--text-mid);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid transparent;
  transition: all .25s ease;
  white-space: nowrap;
}
.nav-link:hover {
  color: var(--text-hi);
  background: rgba(56, 189, 248, 0.08);
  border-color: rgba(56, 189, 248, 0.15);
}
.nav-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.nav-link.active {
  color: #fff;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(56, 189, 248, 0.08));
  border-color: rgba(56, 189, 248, 0.25);
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.08);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-hi);
  font-size: 20px;
  padding: 8px 10px;
  border-radius: 8px;
  transition: background .2s;
}
.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
}
.nav-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.nav-toggle.active {
  color: var(--accent);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all .25s ease;
  cursor: pointer;
  border: none;
  line-height: 1.4;
}
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.btn-primary {
  background: linear-gradient(135deg, #38bdf8, #0284c7);
  color: #fff;
  box-shadow: 0 6px 18px rgba(56, 189, 248, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(56, 189, 248, 0.45);
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.25);
}
.btn-warm {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: #0b101a;
  box-shadow: 0 6px 18px rgba(251, 191, 36, 0.3);
}
.btn-warm:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(251, 191, 36, 0.45);
}
.btn-warm:active {
  transform: translateY(0);
}
.btn-outline {
  background: transparent;
  border: 1px solid rgba(56, 189, 248, 0.45);
  color: var(--accent);
}
.btn-outline:hover {
  background: rgba(56, 189, 248, 0.1);
  border-color: var(--accent);
  transform: translateY(-2px);
}
.btn-outline:active {
  transform: translateY(0);
}
.btn-outline-light {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #fff;
}
.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.7);
  transform: translateY(-2px);
}
.btn-outline-light:active {
  transform: translateY(0);
}
.btn-sm {
  padding: 8px 14px;
  font-size: 13px;
  border-radius: 9px;
}
.btn-lg {
  padding: 14px 28px;
  font-size: 15px;
  border-radius: 12px;
}

/* ===== Badge ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
}

/* ===== Page Banner ===== */
.page-banner {
  padding: 84px 0 72px;
  position: relative;
  background: linear-gradient(135deg, rgba(7, 11, 18, 0.93), rgba(10, 16, 30, 0.88)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  border-bottom: 1px solid var(--border);
}
.page-banner::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(ellipse at 50% 0%, rgba(56, 189, 248, 0.08), transparent 60%);
}
.page-banner .container {
  position: relative;
  z-index: 1;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-low);
  margin-bottom: 26px;
}
.breadcrumb a {
  color: var(--text-mid);
  transition: color .2s;
}
.breadcrumb a:hover {
  color: var(--accent);
}
.breadcrumb .sep {
  color: var(--text-low);
  opacity: .7;
}
.page-title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: .5px;
  color: var(--text-hi);
  max-width: 860px;
  margin-bottom: 16px;
}
.page-desc {
  font-size: 16px;
  color: var(--text-mid);
  line-height: 1.8;
  max-width: 720px;
  margin-bottom: 20px;
}
.page-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.meta-date {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--text-low);
}

/* ===== Article Section ===== */
.article-section {
  padding: 64px 0 28px;
}
.article-card {
  max-width: 880px;
  margin: 0 auto;
  background: linear-gradient(145deg, rgba(21, 29, 47, 0.75), rgba(16, 24, 38, 0.9));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.article-content {
  padding: 44px 48px 30px;
  font-size: 16px;
  line-height: 1.9;
  color: #cbd5e1;
}
.article-content h2 {
  color: #f1f5f9;
  font-size: 24px;
  font-weight: 700;
  margin: 36px 0 14px;
  padding-left: 14px;
  border-left: 4px solid var(--accent);
  border-radius: 0 4px 4px 0;
}
.article-content h3 {
  color: #e2e8f0;
  font-size: 20px;
  font-weight: 600;
  margin: 28px 0 10px;
}
.article-content h4 {
  color: #e2e8f0;
  font-size: 17px;
  font-weight: 600;
  margin: 20px 0 8px;
}
.article-content p {
  margin-bottom: 16px;
}
.article-content ul,
.article-content ol {
  margin: 0 0 18px 22px;
  padding: 0;
}
.article-content li {
  margin-bottom: 8px;
}
.article-content li::marker {
  color: var(--accent);
}
.article-content blockquote {
  border-left: 4px solid var(--accent-warm);
  background: rgba(251, 191, 36, 0.07);
  padding: 16px 22px;
  border-radius: 0 10px 10px 0;
  margin: 22px 0;
  color: #e6edf5;
  font-style: normal;
}
.article-content blockquote p:last-child {
  margin-bottom: 0;
}
.article-content img {
  border-radius: 14px;
  margin: 24px 0;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.article-content a {
  color: var(--accent);
  border-bottom: 1px solid rgba(56, 189, 248, 0.35);
  transition: border-color .2s;
}
.article-content a:hover {
  border-color: var(--accent);
}
.article-content code {
  background: rgba(56, 189, 248, 0.07);
  border: 1px solid rgba(56, 189, 248, 0.15);
  padding: 2px 8px;
  border-radius: 6px;
  font-family: var(--font-code);
  font-size: 0.9em;
  color: #7dd3fc;
}
.article-content pre {
  background: #0d1420;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin: 20px 0;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.7;
}
.article-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: #a7b4c8;
}
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 22px 0;
  font-size: 14px;
}
.article-content th {
  background: rgba(56, 189, 248, 0.1);
  color: #e8edf5;
  font-weight: 600;
  text-align: left;
  padding: 12px 14px;
  border: 1px solid var(--border);
}
.article-content td {
  padding: 11px 14px;
  border: 1px solid var(--border);
  color: #a7b4c8;
}
.article-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 30px 0;
}
.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 22px 48px 28px;
  border-top: 1px solid rgba(34, 48, 73, 0.7);
  background: rgba(10, 15, 26, 0.4);
}
.tag-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.tag {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  border-radius: 8px;
  background: rgba(56, 189, 248, 0.07);
  border: 1px solid rgba(56, 189, 248, 0.15);
  color: var(--text-mid);
  font-size: 12px;
  font-weight: 500;
  transition: all .2s;
}
.tag:hover {
  color: var(--accent);
  border-color: rgba(56, 189, 248, 0.35);
  background: rgba(56, 189, 248, 0.12);
}

/* ===== Not Found ===== */
.not-found-card {
  max-width: 680px;
  margin: 0 auto;
  padding: 72px 40px;
  text-align: center;
  background: linear-gradient(145deg, rgba(21, 29, 47, 0.75), rgba(16, 24, 38, 0.9));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}
.not-found-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: 20px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--accent);
  font-size: 30px;
  margin-bottom: 22px;
}
.not-found-card h2 {
  font-size: 26px;
  color: var(--text-hi);
  margin-bottom: 10px;
}
.not-found-card p {
  color: var(--text-mid);
  margin-bottom: 28px;
}

/* ===== Section Common ===== */
.section-block {
  padding: 72px 0;
}
.section-head {
  text-align: center;
  margin-bottom: 48px;
}
.section-eyebrow {
  display: inline-block;
  padding: 5px 16px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 14px;
}
.section-head h2 {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-hi);
  letter-spacing: .3px;
  margin-bottom: 12px;
}
.section-head p {
  font-size: 15px;
  color: var(--text-mid);
  max-width: 640px;
  margin: 0 auto;
}

/* ===== Category Section ===== */
.category-section {
  padding: 36px 0 72px;
}
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.category-card {
  position: relative;
  display: block;
  background: linear-gradient(145deg, rgba(21, 29, 47, 0.8), rgba(15, 22, 36, 0.9));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all .3s ease;
  text-decoration: none;
}
.category-card:hover {
  transform: translateY(-6px);
  border-color: rgba(56, 189, 248, 0.35);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45), 0 0 28px rgba(56, 189, 248, 0.08);
}
.category-card:active {
  transform: translateY(-3px);
}
.category-cover {
  height: 180px;
  overflow: hidden;
  position: relative;
}
.category-cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(13, 20, 32, 0.85) 100%);
}
.category-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}
.category-card:hover .category-cover img {
  transform: scale(1.05);
}
.category-icon {
  position: absolute;
  top: 146px;
  right: 20px;
  z-index: 2;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #38bdf8, #0284c7);
  color: #fff;
  font-size: 18px;
  border-radius: 13px;
  box-shadow: 0 6px 16px rgba(56, 189, 248, 0.35);
}
.category-card h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-hi);
  padding: 74px 24px 4px;
}
.category-card p {
  font-size: 14px;
  color: var(--text-mid);
  line-height: 1.7;
  padding: 0 24px;
}
.category-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px 22px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  transition: gap .2s ease;
}
.category-card:hover .category-link {
  gap: 12px;
}

/* ===== Process Section ===== */
.process-section {
  padding: 72px 0;
  background: var(--bg-section);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.process-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  counter-reset: step-counter;
}
.process-step {
  position: relative;
  padding: 32px 24px 28px;
  background: rgba(21, 29, 47, 0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all .3s ease;
  overflow: hidden;
}
.process-step::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0;
  transition: opacity .3s;
}
.process-step:hover {
  background: rgba(21, 29, 47, 0.9);
  border-color: rgba(56, 189, 248, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.process-step:hover::before {
  opacity: 1;
}
.step-num {
  font-family: var(--font-code);
  font-size: 28px;
  font-weight: 800;
  color: rgba(56, 189, 248, 0.5);
  letter-spacing: 1px;
  margin-bottom: 12px;
  display: block;
}
.process-step h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-hi);
  margin-bottom: 8px;
}
.process-step p {
  font-size: 14px;
  color: var(--text-mid);
  line-height: 1.7;
}
.process-step .step-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.15);
  color: var(--accent);
  font-size: 12px;
  font-weight: 500;
}

/* ===== FAQ Section ===== */
.faq-section {
  padding: 72px 0;
}
.faq-list {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: rgba(21, 29, 47, 0.6);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all .3s ease;
}
.faq-item:hover {
  border-color: rgba(56, 189, 248, 0.25);
}
.faq-item.open {
  border-color: rgba(56, 189, 248, 0.4);
  background: rgba(21, 29, 47, 0.85);
  box-shadow: var(--shadow-sm);
}
.faq-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 20px 22px;
  background: none;
  border: none;
  color: var(--text-hi);
  font-size: 15px;
  font-weight: 600;
  text-align: left;
  transition: color .2s;
}
.faq-toggle:hover {
  color: var(--accent);
}
.faq-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
  border-radius: var(--radius-md);
}
.faq-toggle i {
  flex-shrink: 0;
  color: var(--text-low);
  transition: transform .3s ease;
}
.faq-item.open .faq-toggle i {
  transform: rotate(180deg);
  color: var(--accent);
}
.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease;
}
.faq-content p {
  padding: 0 22px 20px;
  color: var(--text-mid);
  font-size: 14px;
  line-height: 1.8;
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 64px 0 80px;
}
.cta-panel {
  position: relative;
  padding: 64px 48px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(7, 11, 18, 0.92), rgba(13, 22, 36, 0.88)), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
  border: 1px solid var(--border);
  text-align: center;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.cta-panel::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 100%, rgba(56, 189, 248, 0.12), transparent 70%);
  pointer-events: none;
}
.cta-panel h2 {
  position: relative;
  font-size: 30px;
  font-weight: 800;
  color: var(--text-hi);
  margin-bottom: 14px;
  letter-spacing: .5px;
}
.cta-panel p {
  position: relative;
  color: var(--text-mid);
  font-size: 15px;
  max-width: 560px;
  margin: 0 auto 30px;
  line-height: 1.8;
}
.cta-buttons {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
  padding: 64px 0 28px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 44px;
}
.footer-brand .footer-logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-hi);
  letter-spacing: .3px;
}
.footer-brand .footer-logo .accent {
  color: var(--accent);
}
.footer-brand p {
  color: var(--text-low);
  font-size: 14px;
  line-height: 1.8;
  margin-top: 14px;
  max-width: 320px;
}
.footer-links h4,
.footer-contact h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-hi);
  margin-bottom: 16px;
}
.footer-links a {
  display: block;
  color: var(--text-mid);
  font-size: 14px;
  padding: 5px 0;
  transition: color .2s, padding-left .2s;
}
.footer-links a:hover {
  color: var(--accent);
  padding-left: 6px;
}
.footer-contact p {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-mid);
  font-size: 14px;
  padding: 5px 0;
}
.footer-contact i {
  color: var(--accent);
  width: 18px;
  text-align: center;
}
.footer-bottom {
  border-top: 1px solid rgba(34, 48, 73, 0.6);
  padding-top: 24px;
  text-align: center;
}
.footer-bottom p {
  color: var(--text-low);
  font-size: 13px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
  .process-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    gap: 30px;
  }
  .page-title {
    font-size: 32px;
  }
  .section-head h2 {
    font-size: 28px;
  }
  .article-content {
    padding: 36px 36px 26px;
  }
  .article-footer {
    padding: 20px 36px 24px;
  }
}

@media (max-width: 768px) {
  .site-header {
    padding: 10px 12px;
  }
  .nav-container {
    padding: 8px 12px;
    gap: 10px;
  }
  .nav-toggle {
    display: block;
  }
  .main-nav {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 16px;
    right: 16px;
    background: rgba(16, 24, 38, 0.98);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px;
    flex-direction: column;
    gap: 4px;
    box-shadow: var(--shadow-md);
  }
  .main-nav.open {
    display: flex;
  }
  .nav-link {
    padding: 12px 14px;
    width: 100%;
  }
  .logo-text {
    font-size: 16px;
  }
  .logo-icon {
    width: 34px;
    height: 34px;
    font-size: 14px;
  }
  .page-banner {
    padding: 56px 0 48px;
  }
  .page-title {
    font-size: 28px;
  }
  .page-desc {
    font-size: 15px;
  }
  .article-section {
    padding: 40px 0 20px;
  }
  .article-content {
    padding: 28px 24px 20px;
  }
  .article-footer {
    padding: 18px 24px 22px;
  }
  .category-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .category-cover {
    height: 200px;
  }
  .process-grid {
    grid-template-columns: 1fr;
  }
  .process-step {
    padding: 24px 20px;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .footer-brand p {
    max-width: 100%;
  }
  .section-block {
    padding: 52px 0;
  }
  .section-head h2 {
    font-size: 25px;
  }
  .cta-panel {
    padding: 44px 26px;
  }
  .cta-panel h2 {
    font-size: 25px;
  }
}

@media (max-width: 520px) {
  .container {
    padding: 0 16px;
  }
  .nav-container {
    padding: 8px 10px;
  }
  .nav-actions .btn-sm .btn-text {
    display: none;
  }
  .nav-actions .btn-sm {
    padding: 8px 12px;
  }
  .logo-text {
    font-size: 14px;
  }
  .logo-highlight {
    display: inline;
  }
  .page-banner {
    padding: 44px 0 40px;
  }
  .breadcrumb {
    font-size: 12px;
  }
  .page-title {
    font-size: 23px;
  }
  .page-desc {
    font-size: 14px;
  }
  .page-meta {
    gap: 12px;
  }
  .article-content {
    padding: 22px 16px 16px;
    font-size: 15px;
  }
  .article-content h2 {
    font-size: 20px;
  }
  .article-footer {
    padding: 16px 16px 20px;
    flex-direction: column;
    align-items: flex-start;
  }
  .category-cover {
    height: 170px;
  }
  .section-head {
    margin-bottom: 32px;
  }
  .section-head h2 {
    font-size: 22px;
  }
  .cta-panel {
    padding: 36px 18px;
  }
  .cta-panel h2 {
    font-size: 22px;
  }
  .cta-buttons {
    flex-direction: column;
  }
  .cta-buttons .btn {
    width: 100%;
  }
  .footer-bottom p {
    font-size: 12px;
    line-height: 1.6;
  }
}

/* roulang page: category2 */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1e40af;
  --color-primary-light: #3b82f6;
  --color-accent: #06b6d4;
  --color-bg: #0f172a;
  --color-bg-soft: #1e293b;
  --color-bg-card: #1e293b;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-border: #334155;
  --color-border-light: rgba(148, 163, 184, 0.2);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.45);
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 32px;
  --space-lg: 56px;
  --space-xl: 88px;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s ease, opacity 0.25s ease;
}

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

input {
  font-family: inherit;
}

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ===== Header & Navigation ===== */
.site-header {
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-light);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  height: 80px;
  gap: var(--space-sm);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  margin-right: auto;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 8px 16px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.15), rgba(6, 182, 212, 0.08));
  transition: all 0.3s ease;
}

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

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  flex-shrink: 0;
}

.logo-text {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: #fff;
  white-space: nowrap;
}

.logo-highlight {
  color: var(--color-primary-light);
  margin-left: 2px;
}

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

.nav-link {
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary-light), var(--color-accent));
  border-radius: 2px;
  transition: width 0.3s ease;
}

.nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.04);
}

.nav-link:hover::after {
  width: 60%;
}

.nav-link.active {
  color: #fff;
  background: rgba(37, 99, 235, 0.2);
}

.nav-link.active::after {
  width: 60%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
  color: #fff;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 13px;
  border-radius: 10px;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  font-size: 18px;
  align-items: center;
  justify-content: center;
  transition: background 0.3s;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.12);
}

/* ===== Page Banner ===== */
.page-banner {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.94), rgba(30, 41, 59, 0.88)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  padding: 80px 0 60px;
  border-bottom: 1px solid var(--color-border-light);
  position: relative;
}

.page-banner .banner-content {
  max-width: 760px;
}

.page-banner .banner-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(6, 182, 212, 0.15);
  border: 1px solid rgba(6, 182, 212, 0.3);
  color: #22d3ee;
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}

.page-banner h1 {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #fff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-banner p {
  font-size: 17px;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  max-width: 640px;
}

.banner-stats {
  display: flex;
  gap: 32px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border-light);
}

.banner-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.banner-stat .stat-num {
  font-size: 26px;
  font-weight: 800;
  color: #fff;
}

.banner-stat .stat-num i {
  color: var(--color-accent);
  font-size: 18px;
  margin-left: 4px;
}

.banner-stat .stat-label {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ===== FAQ Category Pills ===== */
.faq-section {
  padding: var(--space-xl) 0;
}

.faq-category-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
  justify-content: center;
}

.faq-pill {
  padding: 10px 22px;
  border-radius: 100px;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
  cursor: pointer;
}

.faq-pill:hover {
  background: rgba(37, 99, 235, 0.15);
  border-color: var(--color-primary);
  color: #fff;
}

.faq-pill.active {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  border-color: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
}

/* ===== FAQ Accordion ===== */
.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: var(--shadow-sm);
}

.faq-item.active {
  border-color: var(--color-primary);
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.15);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 28px;
  cursor: pointer;
  user-select: none;
}

.faq-question .q-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
}

.faq-question .q-badge {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: rgba(37, 99, 235, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary-light);
  font-size: 13px;
  font-weight: 700;
}

.faq-question .q-text {
  font-weight: 600;
  font-size: 16px;
  color: #fff;
  line-height: 1.5;
}

.faq-toggle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: all 0.3s ease;
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 28px 0 76px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.active .faq-answer {
  padding-bottom: 24px;
  max-height: 300px;
}

.faq-answer p {
  color: var(--color-text-muted);
  font-size: 15px;
  line-height: 1.8;
}

.faq-answer ul {
  margin: 10px 0 0 18px;
  color: var(--color-text-muted);
  font-size: 15px;
  line-height: 1.8;
}

/* ===== Section Title ===== */
.section-title {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.section-title .tag {
  display: inline-block;
  background: rgba(37, 99, 235, 0.12);
  border: 1px solid rgba(37, 99, 235, 0.25);
  color: var(--color-primary-light);
  padding: 6px 18px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-title h2 {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 12px;
}

.section-title p {
  color: var(--color-text-muted);
  font-size: 16px;
  max-width: 640px;
  margin: 0 auto;
}

/* ===== Quick Solutions ===== */
.quick-section {
  padding: var(--space-lg) 0;
  background: var(--color-bg-soft);
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.solution-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.solution-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.solution-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(37, 99, 235, 0.4);
}

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

.solution-card .sol-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.2), rgba(6, 182, 212, 0.2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--color-primary-light);
  margin-bottom: 20px;
}

.solution-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.solution-card p {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 16px;
}

.solution-card .sol-link {
  color: var(--color-primary-light);
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.3s ease;
}

.solution-card .sol-link:hover {
  gap: 10px;
  color: var(--color-accent);
}

/* ===== Guide Steps ===== */
.steps-section {
  padding: var(--space-xl) 0;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-top: var(--space-md);
}

.step-card {
  position: relative;
  padding: 28px 24px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: center;
  transition: all 0.3s ease;
}

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

.step-num {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 18px;
  color: #fff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
}

.step-card h4 {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ===== Useful Tips Cards ===== */
.tips-section {
  padding: var(--space-lg) 0;
  background: var(--color-bg-soft);
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.tip-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.3s ease;
  border: 1px solid var(--color-border);
}

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

.tip-card .tip-img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.tip-card:hover .tip-img {
  transform: scale(1.03);
}

.tip-card .tip-body {
  padding: 22px;
}

.tip-card .tip-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(6, 182, 212, 0.12);
  color: #22d3ee;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 10px;
}

.tip-card h4 {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

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

/* ===== CTA Section ===== */
.cta-section {
  padding: var(--space-xl) 0;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.92), rgba(23, 37, 84, 0.92)), url('/assets/images/backpic/back-1.png') center/cover no-repeat fixed;
  text-align: center;
}

.cta-section h2 {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 800;
  margin-bottom: 14px;
}

.cta-section p {
  color: var(--color-text-muted);
  font-size: 16px;
  max-width: 560px;
  margin: 0 auto 30px;
}

.cta-buttons {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: #fff;
}

.btn-outline:hover {
  border-color: var(--color-primary-light);
  background: rgba(37, 99, 235, 0.1);
  color: #fff;
  transform: translateY(-2px);
}

/* ===== Contact Info ===== */
.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: var(--space-md);
}

.contact-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  transition: all 0.3s ease;
}

.contact-card:hover {
  border-color: rgba(37, 99, 235, 0.4);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.contact-card .contact-icon {
  width: 50px;
  height: 50px;
  border-radius: 14px;
  margin: 0 auto 16px;
  background: rgba(37, 99, 235, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--color-primary-light);
}

.contact-card h4 {
  font-size: 16px;
  color: #fff;
  margin-bottom: 8px;
}

.contact-card p {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* ===== Footer ===== */
.site-footer {
  background: #0b1220;
  border-top: 1px solid var(--color-border-light);
  padding: 60px 0 0;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border-light);
}

.footer-logo {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  display: inline-block;
  margin-bottom: 14px;
}

.footer-logo .accent {
  color: var(--color-primary-light);
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.7;
  max-width: 360px;
}

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

.footer-links h4,
.footer-contact h4 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 14px;
  transition: all 0.25s ease;
}

.footer-links a:hover {
  color: var(--color-primary-light);
  transform: translateX(4px);
}

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

.footer-contact i {
  color: var(--color-primary-light);
  width: 18px;
}

.footer-bottom {
  padding: 20px 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 13px;
}

/* ===== Back to top ===== */
.back-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s ease;
  z-index: 99;
}

.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .nav-container {
    height: 70px;
  }
  
  .main-nav {
    gap: 0;
  }
  
  .nav-link {
    padding: 8px 14px;
    font-size: 14px;
  }
  
  .banner-stats {
    flex-wrap: wrap;
    gap: 20px;
  }
  
  .faq-answer {
    padding-left: 28px;
  }
  
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .nav-container {
    flex-wrap: wrap;
    height: auto;
    padding: 14px var(--space-md);
    gap: 10px;
  }
  
  .brand-logo {
    margin-right: 0;
  }
  
  .nav-actions {
    margin-left: auto;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .main-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding-top: 12px;
    border-top: 1px solid var(--color-border-light);
    margin-top: 4px;
  }
  
  .main-nav.open {
    display: flex;
  }
  
  .nav-link {
    width: 100%;
    border-radius: 8px;
    padding: 12px 16px;
  }
  
  .nav-link::after {
    display: none;
  }
  
  .page-banner {
    padding: 50px 0 40px;
  }
  
  .page-banner h1 {
    font-size: 28px;
  }
  
  .container {
    padding: 0 20px;
  }
  
  .faq-question {
    padding: 18px 20px;
  }
  
  .faq-answer {
    padding: 0 20px 0 20px;
  }
  
  .faq-item.active .faq-answer {
    padding-bottom: 20px;
  }
  
  .faq-question .q-badge {
    width: 28px;
    height: 28px;
    font-size: 12px;
  }
  
  .section-title h2 {
    font-size: 24px;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .cta-buttons .btn {
    width: 100%;
    justify-content: center;
  }
  
  .back-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 520px) {
  .brand-logo .logo-text {
    font-size: 15px;
  }
  
  .logo-icon {
    width: 30px;
    height: 30px;
    font-size: 14px;
  }
  
  .nav-container {
    padding: 12px 16px;
  }
  
  .btn-sm {
    padding: 6px 14px;
    font-size: 12px;
  }
  
  .banner-stats {
    flex-direction: column;
    gap: 14px;
  }
  
  .solution-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  
  .footer-brand {
    grid-column: 1;
  }
  
  .faq-category-pills {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }
  
  .faq-pill {
    white-space: nowrap;
  }
  
  .faq-question .q-text {
    font-size: 14px;
  }
  
  .faq-answer p,
  .faq-answer ul {
    font-size: 14px;
  }
  
  .cta-section {
    padding: var(--space-lg) 0;
  }
}

/* roulang page: category3 */
:root {
  --primary: #0b1f3a;
  --primary-deep: #071427;
  --primary-light: #16335c;
  --accent: #00d4aa;
  --accent-strong: #00b892;
  --accent-soft: rgba(0, 212, 170, .14);
  --warn: #ffb020;
  --danger: #ff5d6c;
  --bg: #f2f5fa;
  --bg-soft: #e9edf5;
  --card-bg: #ffffff;
  --dark-card: #0d2440;
  --text: #152238;
  --text-soft: #5a6b85;
  --text-mute: #8a97ac;
  --border: #dce3ee;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px rgba(11, 31, 58, .08);
  --shadow-lg: 0 18px 50px rgba(11, 31, 58, .14);
  --transition: all .3s cubic-bezier(.4, 0, .2, 1);
  --font-family: "PingFang SC", "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-family);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}
img {
  max-width: 100%;
  display: block;
}
ul,
ol {
  list-style: none;
}
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}
input {
  font-family: inherit;
}
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}
/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(11, 31, 58, .04);
}
.nav-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
  gap: 20px;
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--accent);
  font-size: 18px;
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(11, 31, 58, .22);
}
.logo-text {
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: .3px;
  white-space: nowrap;
}
.logo-text .logo-highlight {
  color: var(--accent-strong);
  font-weight: 800;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-soft);
  padding: 5px;
  border-radius: 14px;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-soft);
  transition: var(--transition);
}
.nav-link:hover {
  color: var(--primary);
  background: rgba(255, 255, 255, .8);
}
.nav-link.active {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 4px 14px rgba(11, 31, 58, .28);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  border-radius: 12px;
  padding: 12px 26px;
  font-size: 15px;
  transition: var(--transition);
  color: #fff;
  background: var(--primary);
  border: 1px solid transparent;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(11, 31, 58, .25);
}
.btn-primary {
  background: linear-gradient(135deg, #00d4aa, #00b892);
  color: #06251d;
  box-shadow: 0 4px 16px rgba(0, 212, 170, .3);
}
.btn-primary:hover {
  box-shadow: 0 8px 28px rgba(0, 212, 170, .45);
}
.btn-outline {
  background: transparent;
  border-color: rgba(255, 255, 255, .35);
  color: #fff;
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0, 212, 170, .08);
}
.btn-sm {
  padding: 9px 18px;
  font-size: 14px;
  border-radius: 10px;
}
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--bg-soft);
  color: var(--primary);
  font-size: 18px;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  border: 1px solid var(--border);
}
.nav-toggle:hover {
  background: var(--primary);
  color: #fff;
}
/* ===== Hero Banner ===== */
.page-banner {
  position: relative;
  padding: 110px 0 90px;
  background: linear-gradient(135deg, rgba(7, 20, 39, .92), rgba(11, 31, 58, .78)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  color: #fff;
  overflow: hidden;
}
.page-banner::after {
  content: '';
  position: absolute;
  right: -120px;
  top: -120px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 212, 170, .18), transparent 65%);
  border-radius: 50%;
  pointer-events: none;
}
.page-banner .banner-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}
.banner-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-soft);
  border: 1px solid rgba(0, 212, 170, .35);
  color: var(--accent);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: .4px;
}
.page-banner h1 {
  font-size: 42px;
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: .5px;
  margin-bottom: 18px;
}
.page-banner h1 .grad-text {
  background: linear-gradient(90deg, var(--accent), #6ee7ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-banner p {
  font-size: 17px;
  color: rgba(255, 255, 255, .8);
  max-width: 620px;
  margin-bottom: 32px;
}
.banner-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.banner-stats {
  display: flex;
  gap: 0;
  margin-top: 48px;
  background: rgba(255, 255, 255, .07);
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 16px;
  padding: 12px 0;
  backdrop-filter: blur(8px);
  max-width: 620px;
  overflow: hidden;
}
.banner-stats .stat-item {
  flex: 1;
  text-align: center;
  padding: 8px 12px;
  position: relative;
}
.banner-stats .stat-item + .stat-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 20%;
  height: 60%;
  width: 1px;
  background: rgba(255, 255, 255, .16);
}
.stat-num {
  font-size: 26px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
}
.stat-label {
  font-size: 13px;
  color: rgba(255, 255, 255, .68);
  margin-top: 4px;
}
/* ===== Section Common ===== */
.section {
  padding: 90px 0;
}
.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-strong);
  font-size: 14px;
  font-weight: 700;
  background: var(--accent-soft);
  padding: 6px 18px;
  border-radius: 100px;
  margin-bottom: 14px;
}
.section-head h2 {
  font-size: 32px;
  line-height: 1.3;
  color: var(--primary);
  font-weight: 800;
  margin-bottom: 14px;
}
.section-head p {
  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.8;
}
/* ===== Security Overview ===== */
.overview-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.overview-image {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.overview-image img {
  width: 100%;
  height: 340px;
  object-fit: cover;
}
.overview-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(11, 31, 58, .06), rgba(11, 31, 58, .3));
}
.overview-image .img-badge {
  position: absolute;
  left: 20px;
  bottom: 20px;
  z-index: 2;
  background: rgba(11, 31, 58, .82);
  color: var(--accent);
  padding: 10px 18px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 700;
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  gap: 8px;
}
.overview-content h3 {
  font-size: 26px;
  color: var(--primary);
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.4;
}
.overview-content p {
  color: var(--text-soft);
  margin-bottom: 18px;
  line-height: 1.9;
}
.overview-list {
  margin-top: 20px;
  display: grid;
  gap: 12px;
}
.overview-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 14px 18px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: var(--transition);
}
.overview-list li:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateX(4px);
}
.overview-list .list-ic {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  color: var(--accent-strong);
  border-radius: 10px;
  font-size: 16px;
}
.overview-list .list-text {
  font-weight: 600;
  color: var(--text);
}
.overview-list .list-desc {
  font-size: 14px;
  color: var(--text-soft);
  margin-top: 2px;
  font-weight: 400;
}
/* ===== Security Features ===== */
.features-section {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 28px;
  transition: var(--transition);
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), #6ee7ff);
  opacity: 0;
  transition: var(--transition);
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 212, 170, .4);
}
.feature-card:hover::before {
  opacity: 1;
}
.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--accent);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 6px 18px rgba(11, 31, 58, .22);
}
.feature-card h3 {
  font-size: 19px;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 10px;
}
.feature-card p {
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.8;
}
.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--bg-soft);
  color: var(--text-soft);
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
}
.badge.accent {
  background: var(--accent-soft);
  color: var(--accent-strong);
}
/* ===== Process Flow ===== */
.flow-section {
  background: var(--primary-deep);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.flow-section::before {
  content: '';
  position: absolute;
  left: -80px;
  bottom: -80px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(0, 212, 170, .16), transparent 65%);
  border-radius: 50%;
}
.flow-section .section-head h2 {
  color: #fff;
}
.flow-section .section-head p {
  color: rgba(255, 255, 255, .65);
}
.flow-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
  z-index: 2;
}
.flow-step {
  position: relative;
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: var(--radius);
  padding: 28px 22px;
  backdrop-filter: blur(6px);
  transition: var(--transition);
}
.flow-step:hover {
  background: rgba(255, 255, 255, .1);
  border-color: rgba(0, 212, 170, .4);
  transform: translateY(-4px);
}
.flow-num {
  font-size: 15px;
  font-weight: 800;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 4px 12px;
  display: inline-block;
  margin-bottom: 16px;
  letter-spacing: .5px;
}
.flow-step h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: #fff;
}
.flow-step p {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 255, 255, .68);
}
.flow-arrow {
  position: absolute;
  right: -14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  font-size: 16px;
  z-index: 3;
  opacity: .7;
}
/* ===== Data / Metrics ===== */
.metrics-section {
  padding: 70px 0;
  background: var(--card-bg);
}
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.metric-block {
  text-align: center;
  padding: 36px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}
.metric-block:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.metric-block .metric-ic {
  font-size: 26px;
  color: var(--accent-strong);
  margin-bottom: 12px;
}
.metric-block .metric-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
}
.metric-block .metric-num span {
  font-size: 18px;
  margin-left: 2px;
  color: var(--text-soft);
}
.metric-block .metric-label {
  font-size: 14px;
  color: var(--text-soft);
  margin-top: 8px;
}
/* ===== Compare Panel ===== */
.compare-section {
  background: var(--bg);
}
.compare-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.compare-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.compare-card:hover {
  box-shadow: var(--shadow-lg);
}
.compare-card.bad {
  border-top: 4px solid var(--danger);
}
.compare-card.good {
  border-top: 4px solid var(--accent);
}
.compare-card .compare-head {
  padding: 24px 28px;
  display: flex;
  align-items: center;
  gap: 14px;
  border-bottom: 1px solid var(--border);
}
.compare-card.bad .compare-head {
  background: rgba(255, 93, 108, .06);
}
.compare-card.good .compare-head {
  background: rgba(0, 212, 170, .06);
}
.compare-head .badge-lg {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.compare-card.bad .badge-lg {
  background: rgba(255, 93, 108, .14);
  color: var(--danger);
}
.compare-card.good .badge-lg {
  background: var(--accent-soft);
  color: var(--accent-strong);
}
.compare-head h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
}
.compare-head p {
  font-size: 13px;
  color: var(--text-mute);
}
.compare-list {
  padding: 20px 28px 28px;
  display: grid;
  gap: 12px;
}
.compare-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  color: var(--text-soft);
  line-height: 1.6;
}
.compare-list li i {
  margin-top: 4px;
  font-size: 14px;
  flex-shrink: 0;
}
.compare-card.good .compare-list li i {
  color: var(--accent-strong);
}
.compare-card.bad .compare-list li i {
  color: var(--danger);
}
/* ===== FAQ ===== */
.faq-section {
  background: var(--card-bg);
}
.faq-grid {
  max-width: 820px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
}
.faq-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover {
  border-color: rgba(0, 212, 170, .4);
}
.faq-item.open {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  text-align: left;
  transition: var(--transition);
}
.faq-item.open .faq-question {
  color: var(--primary);
}
.faq-question .faq-ic {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-soft);
  transition: var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-ic {
  background: var(--accent);
  color: #fff;
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease;
}
.faq-answer-inner {
  padding: 0 24px 22px;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.85;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}
/* ===== CTA ===== */
.cta-section {
  position: relative;
  padding: 90px 0;
  background: linear-gradient(135deg, rgba(7, 20, 39, .95), rgba(11, 31, 58, .85)), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
  color: #fff;
  text-align: center;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: -60px;
  left: 50%;
  transform: translateX(-50%);
  width: 420px;
  height: 180px;
  background: radial-gradient(ellipse, rgba(0, 212, 170, .16), transparent 65%);
  pointer-events: none;
}
.cta-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
  margin: 0 auto;
}
.cta-content h2 {
  font-size: 34px;
  font-weight: 800;
  margin-bottom: 14px;
  line-height: 1.3;
}
.cta-content h2 span {
  color: var(--accent);
}
.cta-content p {
  color: rgba(255, 255, 255, .72);
  margin-bottom: 32px;
  font-size: 16px;
}
.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
/* ===== Footer ===== */
.site-footer {
  background: var(--primary-deep);
  color: rgba(255, 255, 255, .72);
  padding: 70px 0 0;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1.4fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.footer-logo {
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  display: inline-block;
  margin-bottom: 14px;
}
.footer-logo .accent {
  color: var(--accent);
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .55);
  max-width: 320px;
}
.footer-links h4,
.footer-contact h4 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  letter-spacing: .4px;
  position: relative;
  padding-bottom: 10px;
}
.footer-links h4::after,
.footer-contact h4::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, .55);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.footer-links a:hover {
  color: var(--accent);
  padding-left: 4px;
}
.footer-contact p {
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  color: rgba(255, 255, 255, .55);
}
.footer-contact p i {
  color: var(--accent);
  width: 18px;
  text-align: center;
}
.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, .4);
  border-top: 1px solid rgba(255, 255, 255, .08);
}
/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .flow-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .flow-arrow {
    display: none;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
  .overview-wrap {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}
@media (max-width: 900px) {
  .main-nav {
    position: fixed;
    top: 74px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 12px 30px rgba(11, 31, 58, .12);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    border-radius: 0 0 16px 16px;
    z-index: 99;
  }
  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-link {
    padding: 14px 16px;
    font-size: 16px;
    border-radius: 12px;
  }
  .nav-toggle {
    display: flex;
  }
  .nav-actions .btn-sm {
    display: none;
  }
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .compare-wrap {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 640px) {
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }
  .nav-container {
    padding: 0 18px;
    height: 66px;
  }
  .logo-text {
    font-size: 17px;
  }
  .logo-icon {
    width: 36px;
    height: 36px;
    font-size: 15px;
  }
  .page-banner {
    padding: 72px 0 56px;
  }
  .page-banner h1 {
    font-size: 30px;
  }
  .page-banner p {
    font-size: 15px;
  }
  .banner-stats {
    flex-direction: column;
    gap: 4px;
  }
  .banner-stats .stat-item + .stat-item::before {
    display: none;
  }
  .section {
    padding: 60px 0;
  }
  .section-head h2 {
    font-size: 26px;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .flow-grid {
    grid-template-columns: 1fr;
  }
  .metrics-grid {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
  .metric-block .metric-num {
    font-size: 28px;
  }
  .overview-wrap {
    gap: 30px;
  }
  .overview-image img {
    height: 250px;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .cta-content h2 {
    font-size: 27px;
  }
  .cta-buttons .btn {
    width: 100%;
  }
  .banner-buttons .btn {
    width: 100%;
  }
}
@media (max-width: 400px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  .nav-actions {
    gap: 8px;
  }
}