/* roulang page: index */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #0e1424;
  --bg-card: #141b2e;
  --bg-elevated: #1a2338;
  --accent-primary: #00f0ff;
  --accent-secondary: #a855f7;
  --accent-gradient: linear-gradient(135deg, #00f0ff 0%, #a855f7 100%);
  --accent-glow: rgba(0, 240, 255, 0.28);
  --accent-glow-strong: rgba(0, 240, 255, 0.45);
  --text-primary: #e8eaf6;
  --text-secondary: #9aa3bb;
  --text-muted: #6b7488;
  --border-color: rgba(0, 240, 255, 0.14);
  --border-light: rgba(255, 255, 255, 0.06);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;
  --shadow-card: 0 6px 30px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 45px rgba(0, 240, 255, 0.12);
  --spacing-section: 96px;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition-base: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
  scroll-behavior: smooth;
}

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

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

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

button,
input {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
  cursor: pointer;
}

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

/* ---------- 导航栏 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 14, 26, 0.86);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition-base);
}

.site-header.scrolled {
  background: rgba(10, 14, 26, 0.96);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--text-primary);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
  white-space: nowrap;
}

.logo::after {
  content: '';
  display: block;
  width: 100%;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: var(--radius-pill);
  margin-top: 2px;
  transform: scaleX(0.6);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.logo:hover::after {
  transform: scaleX(1);
}

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

.nav-link {
  position: relative;
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-pill);
  letter-spacing: 0.3px;
  transition: var(--transition-base);
}

.nav-link::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: var(--accent-glow);
  border-radius: var(--radius-pill);
  transform: translate(-50%, -50%);
  transition: width 0.35s ease, height 0.35s ease;
  z-index: -1;
}

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

.nav-link:hover::before {
  width: 100%;
  height: 36px;
}

.nav-link.active {
  color: var(--accent-primary);
  text-shadow: 0 0 18px var(--accent-glow-strong);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 28px;
  height: 2px;
  background: var(--accent-primary);
  border-radius: var(--radius-pill);
  box-shadow: 0 0 12px var(--accent-glow-strong);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: var(--radius-pill);
  background: var(--accent-gradient);
  color: #0a0e1a;
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 0 24px rgba(0, 240, 255, 0.25);
  transition: var(--transition-base);
  margin-left: 12px;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 40px rgba(0, 240, 255, 0.4);
  color: #0a0e1a;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 6px;
  z-index: 1001;
}

.nav-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--accent-primary);
  border-radius: var(--radius-pill);
  transition: var(--transition-base);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ---------- Hero 首屏 ---------- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(10, 14, 26, 0.94) 0%, rgba(10, 14, 26, 0.8) 50%, rgba(10, 14, 26, 0.6) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  padding: 140px 0 100px;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, rgba(0, 240, 255, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.13) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 820px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 22px;
  border-radius: var(--radius-pill);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--border-color);
  color: var(--accent-primary);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 1px;
  margin-bottom: 28px;
  backdrop-filter: blur(6px);
}

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

.hero h1 {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 1px;
  margin-bottom: 22px;
  text-shadow: 0 0 60px rgba(0, 240, 255, 0.15);
}

.hero h1 .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 34px;
  border-radius: var(--radius-pill);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: var(--transition-base);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #0a0e1a;
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.25);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 50px rgba(0, 240, 255, 0.4);
}

.btn-primary:active {
  transform: translateY(-1px) scale(0.98);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(4px);
}

.btn-ghost:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.15);
  transform: translateY(-3px);
}

.btn-lg {
  padding: 16px 42px;
  font-size: 17px;
}

.hero-metrics {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 44px;
  margin-top: 60px;
  flex-wrap: wrap;
}

.hero-metric {
  text-align: center;
}

.hero-metric .num {
  font-size: 28px;
  font-weight: 800;
  color: var(--accent-primary);
  display: block;
}

.hero-metric .label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---------- 通用板块区 ---------- */
.section {
  padding: var(--spacing-section) 0;
  position: relative;
}

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

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  padding: 6px 20px;
  border-radius: var(--radius-pill);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--border-color);
  color: var(--accent-primary);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 2px;
  margin-bottom: 18px;
}

.section-header h2 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.8;
}

/* ---------- 核心优势 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

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

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

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

.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: rgba(0, 240, 255, 0.1);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--accent-primary);
  margin-bottom: 24px;
  transition: var(--transition-base);
}

.feature-card:hover .feature-icon {
  background: var(--accent-gradient);
  color: #0a0e1a;
  box-shadow: 0 0 30px var(--accent-glow-strong);
}

.feature-card:nth-child(2) .feature-icon {
  color: var(--accent-secondary);
  background: rgba(168, 85, 247, 0.1);
  border-color: rgba(168, 85, 247, 0.25);
}

.feature-card:nth-child(2):hover .feature-icon {
  background: var(--accent-gradient);
  color: #0a0e1a;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

/* ---------- 分类入口 ---------- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.category-card {
  position: relative;
  display: flex;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-light);
  transition: var(--transition-base);
  min-height: 320px;
  background: var(--bg-card);
}

.category-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-color);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.category-card-image {
  position: relative;
  width: 46%;
  overflow: hidden;
}

.category-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.category-card:hover .category-card-image img {
  transform: scale(1.08);
}

.category-card-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, var(--bg-card) 100%);
}

.category-card-content {
  flex: 1;
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.category-card-content .cat-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--accent-primary);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid var(--border-color);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
  align-self: flex-start;
}

.category-card-content h3 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 12px;
}

.category-card-content p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 20px;
}

.category-card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
  color: var(--accent-primary);
}

.category-card-link i {
  transition: transform 0.3s ease;
}

.category-card:hover .category-card-link i {
  transform: translateX(6px);
}

/* ---------- 最新信息 ---------- */
.news-section {
  background: var(--bg-secondary);
}

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

.news-item {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  padding: 28px;
  transition: var(--transition-base);
  display: flex;
  flex-direction: column;
}

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

.news-item a {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.news-category {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  font-size: 12px;
  font-weight: 500;
  color: var(--accent-secondary);
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.2);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 14px;
}

.news-item h3 {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 10px;
  color: var(--text-primary);
  transition: color 0.3s ease;
}

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

.news-item p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-date {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.news-date i {
  font-size: 12px;
}

.news-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px dashed var(--border-color);
  color: var(--text-secondary);
  font-size: 16px;
}

/* ---------- 数据统计 ---------- */
.stats-section {
  background: linear-gradient(135deg, rgba(10, 14, 26, 0.95) 0%, rgba(20, 27, 46, 0.9) 100%), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  background-attachment: fixed;
  position: relative;
  padding: 90px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.stat-item {
  text-align: center;
  padding: 40px 20px;
  background: rgba(20, 27, 46, 0.7);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(8px);
  transition: var(--transition-base);
}

.stat-item:hover {
  border-color: var(--border-color);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.stat-num {
  font-size: 44px;
  font-weight: 800;
  color: var(--accent-primary);
  line-height: 1.2;
  display: block;
  text-shadow: 0 0 30px var(--accent-glow);
}

.stat-num span {
  font-size: 22px;
  font-weight: 700;
  margin-left: 2px;
}

.stat-label {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  letter-spacing: 1px;
}

/* ---------- 操作流程 ---------- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  position: relative;
}

.steps-grid::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 12%;
  right: 12%;
  height: 2px;
  background: linear-gradient(90deg, rgba(0, 240, 255, 0.1), rgba(168, 85, 247, 0.3), rgba(0, 240, 255, 0.1));
  transform: translateY(-50%);
  z-index: 0;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 40px 28px;
  text-align: center;
  transition: var(--transition-base);
  position: relative;
  z-index: 1;
}

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

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #0a0e1a;
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 22px;
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.25);
}

.step-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

/* ---------- FAQ ---------- */
.faq-section {
  background: var(--bg-secondary);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-base);
}

.faq-item:hover {
  border-color: var(--border-color);
}

.faq-item[open] {
  border-color: var(--border-color);
  box-shadow: var(--shadow-glow);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 28px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  list-style: none;
  position: relative;
}

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

.faq-item summary::after {
  content: '+';
  font-size: 26px;
  font-weight: 300;
  color: var(--accent-primary);
  transition: transform 0.3s ease;
  line-height: 1;
}

.faq-item[open] summary::after {
  content: '';
}

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

.faq-item p {
  padding: 0 28px 24px;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- CTA ---------- */
.cta-box {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.12) 0%, rgba(168, 85, 247, 0.12) 100%), var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 70px 50px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-box h2 {
  font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-box p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 460px;
  margin: 0 auto 32px;
}

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

/* ---------- 页脚 ---------- */
.site-footer {
  background: #070a12;
  border-top: 1px solid var(--border-light);
  padding: 80px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr;
  gap: 60px;
  padding-bottom: 50px;
  border-bottom: 1px solid var(--border-light);
}

.footer-logo {
  font-size: 22px;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
  max-width: 320px;
}

.footer-links h4,
.footer-contact h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 12px;
}

.footer-links h4::after,
.footer-contact h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: var(--radius-pill);
}

.footer-links a {
  display: block;
  color: var(--text-muted);
  font-size: 14px;
  padding: 6px 0;
  transition: var(--transition-base);
}

.footer-links a:hover {
  color: var(--accent-primary);
  transform: translateX(6px);
}

.footer-contact p {
  color: var(--text-muted);
  font-size: 14px;
  padding: 6px 0;
}

.footer-bottom {
  padding: 22px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  letter-spacing: 0.5px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  :root {
    --spacing-section: 76px;
  }

  .feature-grid {
    gap: 20px;
  }

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

  .category-card {
    min-height: 280px;
  }

  .footer-grid {
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .site-header {
    background: rgba(10, 14, 26, 0.96);
  }

  .header-inner {
    height: 62px;
  }

  .logo {
    font-size: 18px;
  }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 62px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    background: rgba(10, 14, 26, 0.98);
    padding: 20px 24px 28px;
    gap: 4px;
    transform: translateY(-120%);
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    opacity: 0;
    pointer-events: none;
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
  }

  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    border-radius: var(--radius-sm);
  }

  .nav-link.active::after {
    left: 16px;
    bottom: auto;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
  }

  .nav-cta {
    margin: 16px 0 0 0;
    align-self: stretch;
    justify-content: center;
  }

  .hero {
    min-height: auto;
    padding: 120px 0 70px;
  }

  .hero-metrics {
    gap: 24px;
  }

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

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

  .category-card {
    flex-direction: column;
    min-height: 0;
  }

  .category-card-image {
    width: 100%;
    height: 180px;
  }

  .category-card-image::after {
    background: linear-gradient(0deg, var(--bg-card) 0%, transparent 100%);
  }

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

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

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

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

  .stat-num {
    font-size: 32px;
  }

  .cta-box {
    padding: 50px 24px;
  }

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

  .section-header {
    margin-bottom: 40px;
  }
}

@media (max-width: 520px) {
  :root {
    --spacing-section: 60px;
  }

  .container {
    padding: 0 18px;
  }

  .hero {
    padding: 100px 0 50px;
  }

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

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

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

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

  .hero-metrics {
    gap: 16px;
  }

  .hero-metric .num {
    font-size: 22px;
  }

  .stat-num {
    font-size: 26px;
  }

  .stat-item {
    padding: 24px 12px;
  }

  .cta-box {
    padding: 40px 20px;
  }

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

  .news-item {
    padding: 22px;
  }

  .footer-links h4,
  .footer-contact h4 {
    font-size: 15px;
  }

  .logo {
    font-size: 16px;
  }
}

@media (max-width: 360px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

/* roulang page: article */
:root {
  --primary: #00e5ff;
  --primary-dim: #00b8d4;
  --secondary: #a855f7;
  --accent: #ff3d81;
  --dark: #0b1020;
  --dark-2: #121a30;
  --dark-3: #1b2545;
  --bg: #f4f7fc;
  --card-bg: #ffffff;
  --text: #1a2233;
  --text-weak: #5b6b83;
  --text-invert: #f0f4ff;
  --border: #e2e8f2;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 20px 50px rgba(11, 16, 32, 0.08);
  --shadow-hover: 0 24px 60px rgba(0, 229, 255, 0.18);
  --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --container-width: 1200px;
  --nav-height: 76px;
}
*,
*::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;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}
img {
  max-width: 100%;
  display: block;
}
button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}
ul,
ol {
  list-style: none;
}
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}
::selection {
  background: rgba(0, 229, 255, 0.25);
  color: var(--dark);
}

/* ===== Header & Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--dark);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  border-bottom: 1px solid rgba(0, 229, 255, 0.25);
}
.header-inner {
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 1px;
  background: linear-gradient(120deg, #00e5ff 10%, #a855f7 90%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--primary);
  white-space: nowrap;
  position: relative;
  z-index: 1;
}
.logo::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 4px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), transparent 80%);
  border-radius: 2px;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  color: rgba(240, 244, 255, 0.72);
  border: 1px solid transparent;
  transition: var(--transition);
}
.nav-link:hover {
  color: var(--primary);
  border-color: rgba(0, 229, 255, 0.35);
  background: rgba(0, 229, 255, 0.06);
  transform: translateY(-1px);
}
.nav-link.active {
  color: var(--dark);
  background: linear-gradient(135deg, var(--primary), #7cffd9);
  border-color: transparent;
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.4);
}
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 14px;
  color: #fff;
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 6px 20px rgba(168, 85, 247, 0.35);
  transition: var(--transition);
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(255, 61, 129, 0.4);
  color: #fff;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  cursor: pointer;
  background: rgba(255, 255, 255, 0.04);
}
.nav-toggle span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--text-invert);
  transition: var(--transition);
}
.nav-toggle:hover {
  background: rgba(0, 229, 255, 0.1);
}
.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Page Banner ===== */
.page-banner {
  position: relative;
  padding: 72px 0 64px;
  background: var(--dark);
  background-image:
    linear-gradient(rgba(11, 16, 32, 0.82), rgba(11, 16, 32, 0.92)),
    url("/assets/images/backpic/back-2.png");
  background-size: cover;
  background-position: center;
  border-bottom: 1px solid rgba(0, 229, 255, 0.2);
}
.banner-inner {
  position: relative;
  z-index: 1;
  color: var(--text-invert);
}
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: rgba(240, 244, 255, 0.55);
  margin-bottom: 20px;
}
.breadcrumb a {
  color: var(--primary);
  font-weight: 500;
}
.breadcrumb a:hover {
  color: #fff;
}
.breadcrumb i {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.35);
}
.banner-title {
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.3;
  max-width: 860px;
  margin-bottom: 18px;
  background: linear-gradient(90deg, #ffffff 30%, var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.banner-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 14px;
  color: rgba(240, 244, 255, 0.65);
}
.banner-meta .meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.banner-meta .meta-item i {
  color: var(--primary);
}
.banner-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 14px;
  border-radius: 999px;
  background: rgba(0, 229, 255, 0.12);
  border: 1px solid rgba(0, 229, 255, 0.4);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
}

/* ===== Article Section ===== */
.article-section {
  padding: 64px 0;
}
.article-layout {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.article-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  border: 1px solid rgba(226, 232, 242, 0.7);
}
.article-cover {
  position: relative;
  width: 100%;
  height: 380px;
  overflow: hidden;
}
.article-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.article-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(11, 16, 32, 0.45));
}
.article-card:hover .article-cover img {
  transform: scale(1.03);
}
.article-body {
  padding: 40px;
}
.article-content {
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--text);
}
.article-content p {
  margin-bottom: 20px;
}
.article-content h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  margin: 40px 0 16px;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  border-radius: 2px;
}
.article-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--text);
}
.article-content h4 {
  font-size: 17px;
  font-weight: 700;
  margin: 20px 0 10px;
}
.article-content ul {
  list-style: none;
  margin: 20px 0;
  padding: 0;
}
.article-content ul li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 10px;
  color: var(--text);
}
.article-content ul li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.4);
}
.article-content ol {
  list-style: none;
  counter-reset: article-counter;
  margin: 20px 0;
  padding: 0;
}
.article-content ol li {
  counter-increment: article-counter;
  position: relative;
  padding-left: 40px;
  margin-bottom: 12px;
}
.article-content ol li::before {
  content: counter(article-counter);
  position: absolute;
  left: 0;
  top: 2px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--dark);
  background: linear-gradient(135deg, var(--primary), #7cffd9);
  border-radius: 8px;
}
.article-content blockquote {
  margin: 28px 0;
  padding: 20px 24px;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.07), rgba(168, 85, 247, 0.06));
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-weak);
  font-style: normal;
}
.article-content blockquote p:last-child {
  margin-bottom: 0;
}
.article-content code {
  font-family: "JetBrains Mono", "Fira Code", Consolas, monospace;
  background: rgba(11, 16, 32, 0.08);
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--secondary);
}
.article-content pre {
  background: var(--dark);
  color: #d6e2ff;
  padding: 24px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid rgba(0, 229, 255, 0.2);
}
.article-content pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: 14px;
}
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.article-content th,
.article-content td {
  border: 1px solid var(--border);
  padding: 12px 16px;
  text-align: left;
}
.article-content th {
  background: var(--dark);
  color: var(--text-invert);
  font-weight: 600;
}
.article-content tr:nth-child(even) {
  background: #f8faff;
}
.article-content a {
  color: var(--primary-dim);
  font-weight: 500;
  border-bottom: 1px dashed rgba(0, 184, 212, 0.4);
}
.article-content a:hover {
  color: var(--secondary);
  border-color: var(--secondary);
}
.article-content img {
  border-radius: var(--radius);
  margin: 28px 0;
  box-shadow: 0 10px 30px rgba(11, 16, 32, 0.12);
}
.article-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 24px 40px;
  border-top: 1px solid var(--border);
  background: #fafcff;
}
.tag-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-weak);
}
.article-tags a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text-weak);
  font-size: 13px;
  font-weight: 500;
  transition: var(--transition);
}
.article-tags a:hover {
  border-color: var(--primary);
  color: var(--primary-dim);
  background: rgba(0, 229, 255, 0.05);
  transform: translateY(-1px);
}

/* 空状态 */
.article-empty {
  text-align: center;
  padding: 100px 24px;
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.empty-icon {
  width: 88px;
  height: 88px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: var(--primary);
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.12), rgba(168, 85, 247, 0.1));
  border-radius: 50%;
  border: 1px solid rgba(0, 229, 255, 0.3);
}
.article-empty h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
}
.article-empty p {
  color: var(--text-weak);
  margin-bottom: 28px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), #4dd8ff);
  color: var(--dark);
  box-shadow: 0 8px 26px rgba(0, 229, 255, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 34px rgba(0, 229, 255, 0.42);
  color: var(--dark);
}
.btn-ghost {
  border-color: var(--border);
  color: var(--text);
  background: #fff;
}
.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--primary-dim);
  transform: translateY(-2px);
}

/* ===== Related Service ===== */
.service-section {
  padding: 0 0 80px;
}
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 36px;
}
.section-title {
  font-size: 30px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.5px;
  color: var(--text);
}
.section-title span {
  color: var(--primary-dim);
  position: relative;
}
.section-sub {
  color: var(--text-weak);
  font-size: 15px;
  max-width: 480px;
  text-align: right;
}
.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.service-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--border);
  box-shadow: 0 6px 20px rgba(11, 16, 32, 0.05);
  transition: var(--transition);
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(0, 229, 255, 0.4);
}
.service-card .card-cover {
  height: 130px;
  overflow: hidden;
  position: relative;
}
.service-card .card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.service-card:hover .card-cover img {
  transform: scale(1.06);
}
.service-card .card-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 30%, rgba(11, 16, 32, 0.3));
}
.card-body {
  padding: 20px 20px 24px;
}
.card-body h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}
.card-body p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.6;
  margin-bottom: 14px;
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary-dim);
}
.card-link i {
  transition: transform 0.3s ease;
}
.card-link:hover {
  color: var(--secondary);
}
.card-link:hover i {
  transform: translateX(4px);
}

/* ===== CTA ===== */
.cta-section {
  padding: 0 0 80px;
}
.cta-banner {
  position: relative;
  border-radius: 24px;
  padding: 64px 56px;
  background: var(--dark);
  background-image:
    linear-gradient(rgba(11, 16, 32, 0.8), rgba(11, 16, 32, 0.9)),
    url("/assets/images/backpic/back-3.png");
  background-size: cover;
  background-position: center;
  overflow: hidden;
  text-align: center;
  border: 1px solid rgba(0, 229, 255, 0.2);
}
.cta-banner::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.35), transparent 70%);
  border-radius: 50%;
}
.cta-banner::after {
  content: "";
  position: absolute;
  bottom: -80px;
  left: -40px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.3), transparent 70%);
  border-radius: 50%;
}
.cta-banner h2 {
  position: relative;
  z-index: 1;
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}
.cta-banner p {
  position: relative;
  z-index: 1;
  color: rgba(240, 244, 255, 0.7);
  max-width: 560px;
  margin: 0 auto 30px;
  font-size: 15px;
}
.cta-banner .btn {
  position: relative;
  z-index: 1;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--dark);
  padding: 64px 0 0;
  border-top: 1px solid rgba(0, 229, 255, 0.15);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-logo {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 1px;
  background: linear-gradient(120deg, #00e5ff 10%, #a855f7 90%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 14px;
}
.footer-brand p {
  color: rgba(240, 244, 255, 0.55);
  font-size: 14px;
  line-height: 1.7;
  max-width: 300px;
}
.footer-links h4,
.footer-contact h4 {
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 18px;
  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: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 2px;
}
.footer-links a {
  display: block;
  color: rgba(240, 244, 255, 0.55);
  font-size: 14px;
  padding: 6px 0;
  transition: var(--transition);
}
.footer-links a:hover {
  color: var(--primary);
  padding-left: 6px;
}
.footer-contact p {
  color: rgba(240, 244, 255, 0.55);
  font-size: 14px;
  padding: 6px 0;
  display: flex;
  align-items: center;
}
.footer-contact i {
  color: var(--primary);
  font-size: 15px;
}
.footer-bottom {
  padding: 22px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  color: rgba(240, 244, 255, 0.35);
  font-size: 13px;
}

/* ===== Reset Focus ===== */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}
@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }
  .main-nav {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 20px 24px;
    background: var(--dark);
    border-top: 1px solid rgba(0, 229, 255, 0.2);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    border-radius: 0 0 20px 20px;
    z-index: 199;
  }
  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-link {
    justify-content: center;
    padding: 14px 20px;
    font-size: 16px;
    border-radius: 12px;
  }
  .nav-cta {
    justify-content: center;
    margin-top: 6px;
    padding: 14px 20px;
  }
  .nav-toggle {
    display: flex;
  }
  .page-banner {
    padding: 48px 0 44px;
  }
  .banner-title {
    font-size: 26px;
  }
  .article-cover {
    height: 260px;
  }
  .article-body {
    padding: 28px 24px;
  }
  .article-tags {
    padding: 20px 24px;
  }
  .cta-banner {
    padding: 44px 24px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    justify-content: center;
    text-align: center;
  }
}
@media (max-width: 520px) {
  .container {
    padding: 0 16px;
  }
  .logo {
    font-size: 18px;
  }
  .service-grid {
    grid-template-columns: 1fr;
  }
  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .section-sub {
    text-align: left;
  }
  .banner-meta {
    gap: 10px;
    font-size: 13px;
  }
  .article-cover {
    height: 200px;
  }
  .article-body {
    padding: 22px 18px;
  }
  .article-content {
    font-size: 15.5px;
  }
  .article-content h2 {
    font-size: 22px;
  }
  .article-content h3 {
    font-size: 18px;
  }
  .cta-banner {
    padding: 36px 20px;
    border-radius: 16px;
  }
  .banner-title {
    font-size: 22px;
  }
}

/* roulang page: category1 */
:root {
  --bg-void: #070a12;
  --bg-deep: #0b101b;
  --bg-card: rgba(17, 24, 42, 0.82);
  --bg-elevated: rgba(23, 32, 54, 0.92);
  --bg-soft: rgba(148, 163, 184, 0.06);
  --line: rgba(148, 163, 184, 0.14);
  --line-strong: rgba(148, 163, 184, 0.28);
  --brand: #00e5a0;
  --brand-2: #7c5cff;
  --brand-glow: 0 0 34px rgba(0, 229, 160, 0.2);
  --brand-soft: rgba(0, 229, 160, 0.12);
  --grad: linear-gradient(135deg, #00e5a0 0%, #4af3c0 45%, #7c5cff 100%);
  --text-main: #eef2ff;
  --text-weak: #a3b1c6;
  --text-muted: #67758c;
  --radius: 18px;
  --radius-sm: 12px;
  --radius-lg: 26px;
  --shadow: 0 22px 48px rgba(0, 0, 0, 0.38);
  --shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  --spacer: 96px;
  --spacer-sm: 60px;
  --transition: 0.25s ease;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

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

body {
  background:
    radial-gradient(1000px 420px at 85% -10%, rgba(124, 92, 255, 0.15), transparent 60%),
    radial-gradient(900px 480px at 0% 8%, rgba(0, 229, 160, 0.09), transparent 55%),
    var(--bg-void);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; border: 0; }
button, input { font-family: inherit; font-size: inherit; border: none; background: none; color: inherit; cursor: pointer; }
ul, ol { list-style: none; }

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

.section { padding: var(--spacer) 0; position: relative; }

.section-head {
  max-width: 720px;
  margin: 0 auto 52px;
  text-align: center;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--brand);
  background: var(--brand-soft);
  border: 1px solid rgba(0, 229, 160, 0.28);
  box-shadow: 0 0 18px rgba(0, 229, 160, 0.08);
  margin-bottom: 18px;
}

.section-head h2 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.section-head p {
  color: var(--text-weak);
  font-size: 16px;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(7, 10, 18, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.24);
}

.site-header::after {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--brand), var(--brand-2), transparent);
  opacity: 0.7;
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
  gap: 20px;
}

.logo {
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
  transition: opacity var(--transition);
}

.logo:hover { opacity: 0.82; }

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

.nav-link {
  position: relative;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-weak);
  transition: color var(--transition), background var(--transition), box-shadow var(--transition);
}

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

.nav-link.active {
  color: var(--brand);
  background: var(--brand-soft);
  box-shadow: 0 0 18px rgba(0, 229, 160, 0.12);
  text-shadow: 0 0 12px rgba(0, 229, 160, 0.35);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 22px;
  margin-left: 10px;
  border-radius: 999px;
  background: var(--grad);
  color: #0b1a14;
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 0 22px rgba(0, 229, 160, 0.25);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 34px rgba(0, 229, 160, 0.4);
  filter: brightness(1.08);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  z-index: 110;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text-main);
  border-radius: 4px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Breadcrumb */
.breadcrumb {
  max-width: 1200px;
  margin: 74px auto 0;
  padding: 18px 24px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-weak); transition: color var(--transition); }
.breadcrumb a:hover { color: var(--brand); }
.breadcrumb span { display: inline-flex; align-items: center; gap: 10px; }

/* Page Hero */
.page-hero {
  position: relative;
  padding: 120px 0 110px;
  overflow: hidden;
}

.hero-backdrop {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: -2;
}

.hero-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 10, 18, 0.92) 0%, rgba(7, 10, 18, 0.78) 50%, rgba(7, 10, 18, 0.95) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 22px;
  border-radius: 999px;
  background: rgba(0, 229, 160, 0.1);
  border: 1px solid rgba(0, 229, 160, 0.3);
  color: var(--brand);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 26px;
  box-shadow: 0 0 20px rgba(0, 229, 160, 0.12);
}

.hero-content h1 {
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1.22;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content p {
  color: var(--text-weak);
  font-size: 17px;
  max-width: 640px;
  margin: 0 auto 34px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
}

.btn-primary {
  background: var(--grad);
  color: #0b1a14;
  box-shadow: 0 0 26px rgba(0, 229, 160, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 38px rgba(0, 229, 160, 0.5);
  filter: brightness(1.08);
}

.btn-ghost {
  background: rgba(148, 163, 184, 0.06);
  color: var(--text-main);
  border: 1px solid var(--line-strong);
}

.btn-ghost:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 229, 160, 0.5);
  color: var(--brand);
  box-shadow: 0 0 24px rgba(0, 229, 160, 0.15);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-top: 50px;
  flex-wrap: wrap;
}

.hero-stat {
  min-width: 130px;
  padding: 18px 22px;
  border-radius: var(--radius);
  background: rgba(17, 24, 42, 0.66);
  border: 1px solid var(--line);
  text-align: center;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.hero-stat:hover {
  border-color: rgba(0, 229, 160, 0.4);
  box-shadow: 0 0 24px rgba(0, 229, 160, 0.12);
  transform: translateY(-3px);
}

.hero-stat strong {
  display: block;
  font-size: 26px;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

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

/* Path Section */
.path-section {
  border-top: 1px solid var(--line);
  background: rgba(11, 16, 27, 0.4);
}

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

.step-card {
  position: relative;
  padding: 34px 26px 30px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.step-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--grad);
  opacity: 0;
  transition: opacity var(--transition);
}

.step-card:hover {
  transform: translateY(-5px);
  border-color: rgba(0, 229, 160, 0.45);
  box-shadow: var(--shadow), var(--brand-glow);
}

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

.step-index {
  position: absolute;
  top: 22px;
  right: 24px;
  font-size: 40px;
  font-weight: 800;
  color: rgba(148, 163, 184, 0.1);
  line-height: 1;
}

.step-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: var(--brand-soft);
  border: 1px solid rgba(0, 229, 160, 0.28);
  color: var(--brand);
  font-size: 20px;
  margin-bottom: 20px;
  box-shadow: 0 0 18px rgba(0, 229, 160, 0.12);
}

.step-card h3 {
  font-size: 19px;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

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

.path-note {
  margin-top: 42px;
  text-align: center;
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.path-note .tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  color: var(--text-weak);
  font-size: 13px;
}

/* Prepare Section */
.prepare-section {
  border-top: 1px solid var(--line);
  background: rgba(7, 10, 18, 0.6);
}

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

.prepare-card {
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.prepare-card:hover {
  transform: translateY(-5px);
  border-color: rgba(124, 92, 255, 0.5);
  box-shadow: var(--shadow), 0 0 28px rgba(124, 92, 255, 0.16);
}

.prepare-pic {
  height: 148px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.prepare-pic img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.prepare-card:hover .prepare-pic img { transform: scale(1.05); }

.prepare-body { padding: 24px; }

.mini-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border-radius: 999px;
  background: rgba(124, 92, 255, 0.12);
  border: 1px solid rgba(124, 92, 255, 0.3);
  color: #b3a6ff;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 14px;
}

.prepare-body h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

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

/* Methods Section */
.methods-section {
  border-top: 1px solid var(--line);
}

.methods-wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.methods-content .section-label { margin-bottom: 16px; }

.methods-content h2 {
  font-size: clamp(26px, 3.6vw, 36px);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.methods-content > p {
  color: var(--text-weak);
  margin-bottom: 30px;
}

.method-list {
  display: grid;
  gap: 14px;
}

.method-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--line);
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}

.method-list li:hover {
  border-color: rgba(0, 229, 160, 0.35);
  background: rgba(17, 24, 42, 0.95);
  transform: translateX(4px);
}

.method-list i {
  color: var(--brand);
  font-size: 17px;
  margin-top: 4px;
  flex-shrink: 0;
}

.method-list strong {
  display: block;
  font-size: 15px;
  margin-bottom: 3px;
}

.method-list span {
  color: var(--text-weak);
  font-size: 14px;
}

.methods-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow), 0 0 40px rgba(0, 229, 160, 0.08);
  position: relative;
}

.methods-visual::after {
  content: "";
  display: block;
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

.methods-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 380px;
}

/* Security Section */
.security-section {
  position: relative;
  border-top: 1px solid var(--line);
  background-size: cover;
  background-position: center;
}

.security-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 10, 18, 0.9), rgba(7, 10, 18, 0.85));
  z-index: 0;
}

.security-section .container {
  position: relative;
  z-index: 1;
}

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

.security-card {
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  background: rgba(17, 24, 42, 0.78);
  border: 1px solid var(--line);
  backdrop-filter: blur(8px);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.security-card:hover {
  border-color: rgba(0, 229, 160, 0.42);
  box-shadow: var(--shadow), var(--brand-glow);
  transform: translateY(-4px);
}

.security-card .icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: rgba(0, 229, 160, 0.12);
  border: 1px solid rgba(0, 229, 160, 0.26);
  color: var(--brand);
  font-size: 18px;
  margin-bottom: 16px;
}

.security-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

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

/* FAQ Section */
.faq-section {
  border-top: 1px solid var(--line);
  background: rgba(11, 16, 27, 0.5);
}

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

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item {
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--line);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.faq-item.open {
  border-color: rgba(0, 229, 160, 0.38);
  box-shadow: 0 0 24px rgba(0, 229, 160, 0.08);
}

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  transition: color var(--transition);
}

.faq-q i {
  font-size: 14px;
  color: var(--text-muted);
  transition: transform var(--transition), color var(--transition);
  flex-shrink: 0;
}

.faq-item.open .faq-q i {
  transform: rotate(180deg);
  color: var(--brand);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-item.open .faq-a { max-height: 360px; }

.faq-a p {
  padding: 0 24px 22px;
  color: var(--text-weak);
  font-size: 15px;
  line-height: 1.8;
}

/* CTA Section */
.cta-section {
  position: relative;
  padding: 100px 0;
  border-top: 1px solid var(--line);
  overflow: hidden;
}

.cta-backdrop {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: -2;
}

.cta-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 10, 18, 0.9), rgba(7, 10, 18, 0.82), rgba(7, 10, 18, 0.92));
}

.cta-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.cta-inner h2 {
  font-size: clamp(26px, 4vw, 38px);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.cta-inner p {
  color: var(--text-weak);
  font-size: 17px;
  margin-bottom: 32px;
}

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

/* Footer */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--line);
  padding: 54px 0 0;
  position: relative;
}

.site-footer::before {
  content: "";
  display: block;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 160, 0.5), transparent);
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 42px;
}

.footer-logo {
  font-size: 22px;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--text-weak);
  font-size: 14px;
  max-width: 330px;
  line-height: 1.8;
}

.footer-links h4,
.footer-contact h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
  position: relative;
  padding-bottom: 10px;
}

.footer-links h4::after,
.footer-contact h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--grad);
  border-radius: 2px;
}

.footer-links a {
  display: block;
  color: var(--text-weak);
  font-size: 14px;
  padding: 6px 0;
  transition: color var(--transition), padding-left var(--transition);
}

.footer-links a:hover {
  color: var(--brand);
  padding-left: 6px;
}

.footer-contact p {
  color: var(--text-weak);
  font-size: 14px;
  padding: 6px 0;
  margin-bottom: 6px;
}

.footer-contact i { color: var(--brand); }

.footer-bottom {
  border-top: 1px solid var(--line);
  padding: 20px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

/* Back to top */
.to-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--line-strong);
  color: var(--text-weak);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 90;
  transition: all var(--transition);
  opacity: 0;
  pointer-events: none;
}

.to-top.show {
  opacity: 1;
  pointer-events: auto;
}

.to-top:hover {
  border-color: var(--brand);
  color: var(--brand);
  box-shadow: 0 0 20px rgba(0, 229, 160, 0.25);
  transform: translateY(-3px);
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

.btn:focus-visible,
.nav-link:focus-visible,
.nav-cta:focus-visible,
.nav-toggle:focus-visible,
.faq-q:focus-visible,
.to-top:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
}

@media (max-width: 1024px) {
  .section { padding: 76px 0; }

  .path-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }

  .prepare-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }

  .security-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }

  .methods-wrap { gap: 36px; }

  .footer-grid { grid-template-columns: 1.2fr 1fr; gap: 36px; }

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

  .hero-stats { gap: 12px; }
}

@media (max-width: 880px) {
  .header-inner { height: 66px; }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 66px;
    left: 16px;
    right: 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    background: rgba(11, 16, 27, 0.98);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 18px;
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateY(-14px);
    pointer-events: none;
    transition: opacity 0.28s ease, transform 0.28s ease;
    z-index: 105;
  }

  .main-nav.open {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .main-nav .nav-link {
    padding: 13px 18px;
    border-radius: var(--radius-sm);
    font-size: 15px;
  }

  .main-nav .nav-cta {
    justify-content: center;
    margin: 8px 0 0;
    padding: 13px 18px;
  }

  .breadcrumb {
    margin-top: 66px;
    padding: 14px 24px 0;
  }

  .page-hero { padding: 96px 0 76px; }

  .methods-wrap { grid-template-columns: 1fr; }

  .methods-visual img { min-height: 300px; }
}

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

  .section-head { margin-bottom: 38px; }

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

  .hero-content p { font-size: 15px; }

  .path-grid { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }

  .prepare-grid { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }

  .security-grid { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; }

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

  .footer-links a { display: inline-block; margin-right: 18px; }
}

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

  .page-hero { padding: 80px 0 60px; }

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

  .btn { width: 100%; }

  .hero-stats { flex-direction: column; align-items: center; width: 100%; }

  .hero-stat { width: 100%; }

  .breadcrumb { padding: 12px 16px 0; }

  .cta-section { padding: 70px 0; }

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

/* roulang page: category2 */
:root {
  --primary: #00e5ff;
  --primary-glow: rgba(0, 229, 255, 0.35);
  --secondary: #7c5cff;
  --secondary-glow: rgba(124, 92, 255, 0.3);
  --accent: #ff2e88;
  --bg-main: #0a0e17;
  --bg-deep: #070a12;
  --bg-card: #121a2e;
  --bg-card-hover: #19233d;
  --text-main: #e8f0ff;
  --text-weak: #8b9cc4;
  --border: rgba(120, 160, 255, 0.14);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.45);
  --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.32);
  --shadow-cta: 0 0 42px var(--primary-glow);
  --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --header-h: 74px;
  --section-pad: 96px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  background: var(--bg-main);
  color: var(--text-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: radial-gradient(ellipse at 20% 0%, rgba(0, 229, 255, 0.06), transparent 45%),
              radial-gradient(ellipse at 85% 15%, rgba(124, 92, 255, 0.07), transparent 40%);
  pointer-events: none;
  z-index: 0;
}
a { color: var(--primary); text-decoration: none; transition: color .25s ease; }
img { max-width: 100%; display: block; }
button { font-family: var(--font-main); cursor: pointer; }
.container { width: min(1200px, 92vw); margin: 0 auto; position: relative; z-index: 1; }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  background: rgba(7, 10, 18, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
}
.site-header.scrolled {
  box-shadow: 0 10px 36px rgba(0, 0, 0, 0.42);
  border-bottom-color: rgba(0, 229, 255, 0.22);
}
.header-inner { height: var(--header-h); display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo {
  font-size: 22px; font-weight: 800; letter-spacing: 0.5px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 24px var(--primary-glow);
  white-space: nowrap;
}
.logo:hover { opacity: 0.85; }
.main-nav { display: flex; align-items: center; gap: 10px; }
.nav-link {
  position: relative;
  color: var(--text-weak);
  font-size: 15px; font-weight: 500;
  padding: 9px 16px;
  border-radius: 999px;
  transition: color .25s, background .25s, box-shadow .25s;
}
.nav-link:hover { color: #fff; background: rgba(255, 255, 255, 0.05); }
.nav-link.active {
  color: var(--primary);
  background: rgba(0, 229, 255, 0.1);
  box-shadow: inset 0 0 0 1px rgba(0, 229, 255, 0.25), 0 0 20px rgba(0, 229, 255, 0.12);
}
.nav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  padding: 10px 22px;
  border-radius: 999px;
  font-size: 14px; font-weight: 700;
  box-shadow: 0 6px 24px rgba(0, 229, 255, 0.22);
  transition: transform .25s, box-shadow .25s, filter .25s;
  white-space: nowrap;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 10px 32px rgba(0, 229, 255, 0.35); filter: brightness(1.08); }
.nav-toggle { display: none; background: none; border: 0; width: 42px; height: 42px; border-radius: 10px; position: relative; z-index: 110; }
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--text-main);
  margin: 5px auto; border-radius: 4px;
  transition: transform .3s, opacity .3s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Page Hero ===== */
.page-hero {
  position: relative;
  padding: 120px 0 96px;
  background: linear-gradient(rgba(7, 10, 18, 0.72), rgba(10, 14, 23, 0.88)), url("/assets/images/backpic/back-2.png") center/cover no-repeat;
  border-bottom: 1px solid var(--border);
}
.page-hero::after {
  content: "";
  position: absolute; bottom: -1px; left: 0; width: 100%; height: 80px;
  background: linear-gradient(to top, var(--bg-main), transparent);
  z-index: 2;
}
.hero-content { position: relative; z-index: 3; max-width: 780px; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; font-size: 13px; color: var(--text-weak); margin-bottom: 24px; }
.breadcrumb a { color: var(--text-weak); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb i { font-size: 10px; color: rgba(255, 255, 255, 0.3); }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.28);
  color: var(--primary);
  font-size: 13px; font-weight: 600;
  padding: 7px 16px;
  border-radius: 999px;
  margin-bottom: 18px;
  box-shadow: 0 0 22px rgba(0, 229, 255, 0.1);
}
.hero-title {
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: 1px;
  color: #fff;
  margin-bottom: 18px;
}
.hero-title .gradient {
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  font-size: 17px;
  color: var(--text-weak);
  line-height: 1.8;
  margin-bottom: 32px;
  max-width: 640px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 15px; font-weight: 700;
  padding: 13px 30px;
  border-radius: 999px;
  border: 0;
  transition: transform .25s, box-shadow .25s, background .25s, color .25s;
}
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow: 0 8px 28px rgba(0, 229, 255, 0.28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 36px rgba(0, 229, 255, 0.4); filter: brightness(1.08); }
.btn-outline {
  color: var(--text-main);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.22);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); background: rgba(0, 229, 255, 0.06); }

/* ===== Section ===== */
.section { padding: var(--section-pad) 0; }
.section-alt { background: linear-gradient(180deg, rgba(18, 26, 46, 0.4), transparent); }
.section-head { max-width: 700px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-tag {
  display: inline-block;
  font-size: 12px; font-weight: 700; letter-spacing: 2px;
  color: var(--primary);
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.22);
  padding: 5px 16px;
  border-radius: 999px;
  margin-bottom: 14px;
  text-transform: uppercase;
}
.section-title { font-size: clamp(26px, 4vw, 38px); font-weight: 800; color: #fff; line-height: 1.3; margin-bottom: 12px; }
.section-subtitle { font-size: 15px; color: var(--text-weak); line-height: 1.8; }

/* ===== Step Path ===== */
.steps-path { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 22px; position: relative; }
.step-node { position: relative; }
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 22px;
  height: 100%;
  position: relative;
  transition: transform .3s, border-color .3s, box-shadow .3s, background .3s;
}
.step-card::before {
  content: "";
  position: absolute; top: 0; left: 24px; right: 24px; height: 2px;
  background: linear-gradient(90deg, var(--primary), transparent);
  opacity: 0.5;
  border-radius: 4px;
}
.step-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 229, 255, 0.3);
  box-shadow: var(--shadow-card);
  background: var(--bg-card-hover);
}
.step-number {
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  font-size: 13px; font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.3);
  margin-bottom: 18px;
}
.step-icon {
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 14px;
  background: rgba(0, 229, 255, 0.1);
  color: var(--primary);
  font-size: 20px;
  margin-bottom: 16px;
  border: 1px solid rgba(0, 229, 255, 0.15);
}
.step-card h3 { font-size: 18px; color: #fff; margin-bottom: 8px; font-weight: 700; }
.step-card p { font-size: 14px; color: var(--text-weak); line-height: 1.7; }
.step-line {
  position: absolute; top: 50%; right: -22px; width: 22px; height: 2px;
  background: linear-gradient(90deg, var(--primary-glow), transparent);
  z-index: 0;
  display: none;
}
@media (min-width: 1025px) {
  .step-line { display: block; }
}

/* ===== Feature Grid ===== */
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.feature-card {
  display: flex; flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform .3s, box-shadow .3s, border-color .3s;
}
.feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-card); border-color: rgba(0, 229, 255, 0.26); }
.feature-thumb { position: relative; height: 210px; overflow: hidden; }
.feature-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.feature-thumb::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 50%, rgba(10, 14, 23, 0.82)); }
.feature-card:hover .feature-thumb img { transform: scale(1.05); }
.feature-tag {
  position: absolute; top: 14px; left: 14px; z-index: 2;
  font-size: 12px; font-weight: 700;
  color: var(--primary);
  background: rgba(7, 10, 18, 0.75);
  border: 1px solid rgba(0, 229, 255, 0.3);
  padding: 4px 14px;
  border-radius: 999px;
  backdrop-filter: blur(8px);
}
.feature-body { padding: 24px 26px 28px; flex: 1; }
.feature-body h3 { font-size: 19px; font-weight: 700; color: #fff; margin-bottom: 10px; }
.feature-body p { font-size: 14px; color: var(--text-weak); line-height: 1.75; margin-bottom: 16px; }
.feature-link { font-size: 14px; font-weight: 600; display: inline-flex; align-items: center; gap: 6px; color: var(--primary); }
.feature-link:hover { gap: 10px; }
.feature-link i { font-size: 12px; }

/* ===== Tips List ===== */
.tips-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.tip-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  display: flex; gap: 16px; align-items: flex-start;
  transition: border-color .3s, transform .3s, box-shadow .3s;
}
.tip-item:hover { transform: translateY(-4px); border-color: rgba(124, 92, 255, 0.3); box-shadow: var(--shadow-card); }
.tip-icon {
  width: 42px; height: 42px; flex: 0 0 42px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 12px;
  font-size: 17px;
  color: var(--secondary);
  background: rgba(124, 92, 255, 0.12);
  border: 1px solid rgba(124, 92, 255, 0.2);
}
.tip-item h3 { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.tip-item p { font-size: 13px; color: var(--text-weak); line-height: 1.7; }
.tip-tag {
  display: inline-block;
  font-size: 11px; font-weight: 600;
  color: var(--secondary);
  background: rgba(124, 92, 255, 0.08);
  border: 1px solid rgba(124, 92, 255, 0.18);
  padding: 2px 10px;
  border-radius: 999px;
  margin-top: 10px;
}

/* ===== Stats / Progress ===== */
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  margin-bottom: 44px;
}
.stat-block {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 16px;
  transition: border-color .3s, box-shadow .3s;
}
.stat-block:hover { border-color: rgba(0, 229, 255, 0.28); box-shadow: var(--shadow-card); }
.stat-num {
  font-size: 38px; font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
  margin-bottom: 6px;
}
.stat-label { font-size: 13px; color: var(--text-weak); }
.progress-wrap { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 36px 32px; }
.progress-row { margin-bottom: 26px; }
.progress-row:last-child { margin-bottom: 0; }
.progress-info { display: flex; justify-content: space-between; font-size: 14px; color: var(--text-main); margin-bottom: 8px; }
.progress-info span:last-child { color: var(--primary); font-weight: 700; }
.progress-bar { height: 8px; background: rgba(255, 255, 255, 0.07); border-radius: 999px; overflow: hidden; }
.progress-fill { height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--primary), var(--secondary)); box-shadow: 0 0 14px rgba(0, 229, 255, 0.3); position: relative; }

/* ===== FAQ ===== */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color .3s, box-shadow .3s;
}
.faq-item.active { border-color: rgba(0, 229, 255, 0.3); box-shadow: 0 0 24px rgba(0, 229, 255, 0.06); }
.faq-header { display: flex; align-items: center; justify-content: space-between; padding: 22px 24px; cursor: pointer; user-select: none; }
.faq-header h3 { font-size: 16px; font-weight: 600; color: var(--text-main); padding-right: 16px; }
.faq-icon {
  width: 28px; height: 28px; flex: 0 0 28px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: rgba(0, 229, 255, 0.1);
  color: var(--primary);
  font-size: 13px;
  transition: transform .3s, background .3s;
}
.faq-item.active .faq-icon { transform: rotate(45deg); background: rgba(0, 229, 255, 0.22); }
.faq-body { max-height: 0; overflow: hidden; transition: max-height .4s ease, padding .3s ease; padding: 0 24px; }
.faq-item.active .faq-body { max-height: 300px; padding: 0 24px 22px; }
.faq-body p { font-size: 14px; color: var(--text-weak); line-height: 1.8; border-left: 2px solid var(--primary); padding-left: 14px; }

/* ===== CTA ===== */
.cta-box {
  position: relative;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.1), rgba(124, 92, 255, 0.08)), url("/assets/images/backpic/back-3.png") center/cover no-repeat;
  border: 1px solid rgba(0, 229, 255, 0.2);
  border-radius: var(--radius-lg);
  padding: 62px 48px;
  text-align: center;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.cta-box::before { content: ""; position: absolute; inset: 0; background: rgba(7, 10, 18, 0.6); }
.cta-box > * { position: relative; z-index: 2; }
.cta-title { font-size: clamp(24px, 3.4vw, 36px); font-weight: 800; color: #fff; margin-bottom: 12px; }
.cta-text { font-size: 15px; color: var(--text-weak); margin-bottom: 28px; max-width: 520px; margin-left: auto; margin-right: auto; }
.cta-btn-group { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
.btn-light {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow: var(--shadow-cta);
}
.btn-light:hover { transform: translateY(-3px); filter: brightness(1.1); }

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
  padding: 60px 0 28px;
  margin-top: 20px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1.2fr; gap: 44px; padding-bottom: 40px; border-bottom: 1px solid rgba(255, 255, 255, 0.06); margin-bottom: 28px; }
.footer-logo { font-size: 22px; font-weight: 800; color: #fff; margin-bottom: 12px; }
.footer-logo span { background: linear-gradient(90deg, var(--primary), var(--secondary)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.footer-brand p { font-size: 14px; color: var(--text-weak); line-height: 1.8; margin-top: 8px; max-width: 300px; }
.footer-links h4, .footer-contact h4 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-links a { display: block; font-size: 14px; color: var(--text-weak); margin-bottom: 10px; }
.footer-links a:hover { color: var(--primary); }
.footer-contact p { font-size: 14px; color: var(--text-weak); margin-bottom: 10px; line-height: 1.7; }
.footer-contact i { color: var(--primary); width: 18px; text-align: center; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; font-size: 13px; color: var(--text-weak); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  :root { --section-pad: 72px; }
  .steps-path { grid-template-columns: repeat(2, 1fr); }
  .step-line { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .tips-list { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  :root { --section-pad: 56px; --header-h: 64px; }
  .nav-toggle { display: flex; flex-direction: column; justify-content: center; align-items: center; }
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; width: 100%;
    background: rgba(7, 10, 18, 0.98);
    flex-direction: column; align-items: stretch;
    padding: 20px 6vw 28px;
    gap: 8px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: transform .35s ease, opacity .3s ease;
  }
  .main-nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-link { padding: 14px 18px; font-size: 16px; text-align: center; border-radius: 12px; }
  .nav-cta { justify-content: center; margin-top: 8px; }
  .page-hero { padding: 72px 0 56px; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .steps-path { grid-template-columns: 1fr; }
  .tips-list { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .cta-box { padding: 44px 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 520px) {
  .logo { font-size: 18px; }
  .hero-title { font-size: 30px; }
  .hero-subtitle { font-size: 15px; }
  .section-title { font-size: 24px; }
  .feature-thumb { height: 170px; }
  .faq-header { padding: 18px 18px; }
  .faq-body { padding: 0 18px; }
  .faq-item.active .faq-body { padding: 0 18px 18px; }
  .cta-btn-group .btn { width: 100%; justify-content: center; }
}

/* ===== Keyframes ===== */
@keyframes fadeUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
.fade-up { animation: fadeUp .6s ease both; }
.fade-up-1 { animation-delay: .08s; }
.fade-up-2 { animation-delay: .16s; }
.fade-up-3 { animation-delay: .24s; }