/* roulang page: index */
:root {
  --clr-primary: #00d9ff;
  --clr-primary-dark: #00b3d4;
  --clr-secondary: #8b5cf6;
  --clr-secondary-dark: #7c3aed;
  --clr-bg: #0a0e17;
  --clr-bg-soft: #0f1728;
  --clr-card: #131c2e;
  --clr-card-hover: #19243a;
  --clr-text: #eef2f8;
  --clr-text-muted: #94a3b8;
  --clr-border: rgba(0, 217, 255, 0.14);
  --clr-border-soft: rgba(255, 255, 255, 0.06);
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 30px rgba(0, 217, 255, 0.12);
  --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --header-h: 78px;
  --container-w: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

i.fa,
i.fas,
i.fab,
i.far {
  font-style: normal;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  padding: 14px 28px;
  border-radius: 999px;
  border: 2px solid transparent;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}
.btn-sm {
  padding: 9px 20px;
  font-size: 14px;
}
.btn-lg {
  padding: 16px 38px;
  font-size: 16px;
}
.btn-neon {
  background: linear-gradient(135deg, var(--clr-primary) 0%, var(--clr-secondary) 100%);
  color: #07101f;
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.25);
}

.btn-neon:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 34px rgba(0, 217, 255, 0.4);
  color: #07101f;
}

.btn-neon:active {
  transform: translateY(0);
  box-shadow: 0 0 14px rgba(0, 217, 255, 0.2);
}

.btn-outline {
  background: transparent;
  border-color: rgba(0, 217, 255, 0.5);
  color: var(--clr-primary);
}

.btn-outline:hover {
  background: rgba(0, 217, 255, 0.1);
  border-color: var(--clr-primary);
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.12);
}

.btn-outline:active {
  transform: translateY(0);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.05);
  color: var(--clr-text);
  border-color: var(--clr-border-soft);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* Section */
.section {
  padding: 96px 0;
  position: relative;
}

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

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

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  color: var(--clr-primary);
  background: rgba(0, 217, 255, 0.1);
  border: 1px solid var(--clr-border);
  border-radius: 999px;
  padding: 7px 18px;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.section-head h2 {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 12px;
  background: linear-gradient(120deg, #ffffff 30%, var(--clr-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* Header */
.site-header {
  background: rgba(10, 14, 23, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--clr-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-h);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.site-header::after {
  content: "";
  display: block;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--clr-primary), var(--clr-secondary), transparent);
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

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

.brand-badge {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 800;
  color: #07101f;
  box-shadow: 0 0 18px rgba(0, 217, 255, 0.25);
}

.brand-name {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.brand-name:hover {
  color: var(--clr-primary);
}

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

.nav-item {
  position: relative;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--clr-text-muted);
  border-radius: 999px;
  transition: var(--transition);
}

.nav-item:hover {
  color: var(--clr-text);
  background: rgba(255, 255, 255, 0.05);
}

.nav-item.active {
  color: var(--clr-primary);
  background: rgba(0, 217, 255, 0.1);
  box-shadow: 0 0 18px rgba(0, 217, 255, 0.12);
}

.nav-item.active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 22px;
  height: 2px;
  background: var(--clr-primary);
  border-radius: 4px;
  box-shadow: 0 0 8px var(--clr-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--clr-border-soft);
}

.nav-toggle .bar {
  width: 20px;
  height: 2px;
  background: var(--clr-text);
  border-radius: 4px;
  transition: var(--transition);
}

.nav-toggle.active .bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle.active .bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Hero */
.hero {
  position: relative;
  padding: 130px 0 140px;
  overflow: hidden;
  background: var(--clr-bg);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center center;
  opacity: 0.35;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(0, 217, 255, 0.15) 0%, transparent 60%);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 14, 23, 0.7) 0%, rgba(10, 14, 23, 0.85) 40%, var(--clr-bg) 100%);
}

.hero::before {
  content: "";
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: rgba(0, 217, 255, 0.08);
  filter: blur(120px);
  top: -200px;
  right: -150px;
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: rgba(139, 92, 246, 0.08);
  filter: blur(120px);
  bottom: -150px;
  left: -120px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 860px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 217, 255, 0.1);
  border: 1px solid var(--clr-border);
  border-radius: 999px;
  padding: 8px 22px;
  font-size: 14px;
  font-weight: 600;
  color: var(--clr-primary);
  margin-bottom: 28px;
  letter-spacing: 0.5px;
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.1);
}

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

.hero h1 {
  font-size: 54px;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 22px;
  background: linear-gradient(120deg, #ffffff 20%, var(--clr-primary) 70%, var(--clr-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 40px rgba(0, 217, 255, 0.12);
}

.hero-sub {
  font-size: 18px;
  color: var(--clr-text-muted);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-metrics {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  padding-top: 40px;
  border-top: 1px solid var(--clr-border-soft);
}

.metric {
  text-align: center;
}

.metric-num {
  font-size: 28px;
  font-weight: 800;
  color: var(--clr-text);
  display: block;
  margin-bottom: 4px;
}

.metric-num span {
  color: var(--clr-primary);
}

.metric-label {
  font-size: 14px;
  color: var(--clr-text-muted);
}

/* 特点卡片 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border-soft);
  border-radius: var(--radius-md);
  padding: 34px 26px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-primary), var(--clr-secondary));
  opacity: 0;
  transition: var(--transition);
}

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

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

.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.16), rgba(139, 92, 246, 0.16));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--clr-primary);
  margin-bottom: 20px;
  border: 1px solid var(--clr-border);
}

.feature-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
}

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

/* 分类卡片 */
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;
}

.category-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 300px;
  display: flex;
  align-items: flex-end;
  padding: 36px;
  transition: var(--transition);
  border: 1px solid var(--clr-border-soft);
}

.category-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.category-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 20%, rgba(10, 14, 23, 0.85) 75%);
}

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

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

.category-card-content {
  position: relative;
  z-index: 2;
  width: 100%;
}

.category-card .cat-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  background: rgba(0, 217, 255, 0.15);
  border: 1px solid var(--clr-border);
  color: var(--clr-primary);
  border-radius: 999px;
  padding: 5px 14px;
  margin-bottom: 14px;
}

.category-card h3 {
  font-size: 26px;
  font-weight: 800;
  margin-bottom: 8px;
}

.category-card p {
  font-size: 15px;
  color: var(--clr-text-muted);
  margin-bottom: 18px;
}

.category-card .cat-link {
  display: inline-flex;
  gap: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--clr-primary);
  align-items: center;
}

.category-card .cat-link:hover {
  gap: 16px;
}

/* 新闻列表 */
.news-list {
  display: grid;
  gap: 20px;
}

.news-item {
  background: var(--clr-card);
  border: 1px solid var(--clr-border-soft);
  border-radius: var(--radius-md);
  padding: 26px 30px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
  transition: var(--transition);
}

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

.news-cat {
  display: inline-block;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.25);
  color: #b39ef7;
  font-size: 13px;
  font-weight: 600;
  border-radius: 999px;
  padding: 5px 14px;
  white-space: nowrap;
}

.news-inner {
  min-width: 0;
}

.news-title {
  font-size: 18px;
  font-weight: 700;
  display: block;
  margin-bottom: 6px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--clr-text);
}

.news-item:hover .news-title {
  color: var(--clr-primary);
}

.news-desc {
  font-size: 14px;
  color: var(--clr-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

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

.news-empty {
  text-align: center;
  padding: 60px 24px;
  background: var(--clr-card);
  border-radius: var(--radius-md);
  border: 1px dashed var(--clr-border);
  color: var(--clr-text-muted);
}

/* 统计 */
.stats-section {
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.06), rgba(139, 92, 246, 0.08)), var(--clr-bg-soft);
  padding: 76px 0;
  border-top: 1px solid var(--clr-border-soft);
  border-bottom: 1px solid var(--clr-border-soft);
}

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

.stat-box {
  text-align: center;
  padding: 24px;
}

.stat-box .stat-num {
  font-size: 44px;
  font-weight: 900;
  line-height: 1.1;
  background: linear-gradient(120deg, var(--clr-primary), var(--clr-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.stat-box .stat-label {
  font-size: 15px;
  color: var(--clr-text-muted);
}

/* 流程 */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  counter-reset: step;
}

.step-card {
  background: var(--clr-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border-soft);
  padding: 36px 26px;
  text-align: center;
  position: relative;
  transition: var(--transition);
}

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

.step-num {
  display: inline-flex;
  width: 48px;
  height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 18px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
  color: #07101f;
  margin-bottom: 20px;
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.2);
}

.step-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

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

.step-arrow {
  position: absolute;
  top: 50%;
  right: -24px;
  transform: translateY(-50%);
  color: var(--clr-primary);
  font-size: 16px;
  z-index: 3;
}

.step-card:last-child .step-arrow {
  display: none;
}

/* 特色内容 */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.showcase-card {
  background: var(--clr-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--clr-border-soft);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.showcase-card:hover {
  transform: translateY(-8px);
  border-color: var(--clr-border);
  box-shadow: var(--shadow-lg);
}

.showcase-img {
  position: relative;
  height: 200px;
  overflow: hidden;
}

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

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

.showcase-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(10, 14, 23, 0.7));
}

.showcase-badge {
  position: absolute;
  z-index: 2;
  top: 16px;
  left: 16px;
  background: rgba(0, 217, 255, 0.18);
  border: 1px solid var(--clr-border);
  color: var(--clr-primary);
  font-size: 12px;
  font-weight: 700;
  border-radius: 999px;
  padding: 5px 12px;
  backdrop-filter: blur(8px);
}

.showcase-body {
  padding: 24px 26px 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.showcase-body h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
}

.showcase-body p {
  font-size: 14px;
  color: var(--clr-text-muted);
  line-height: 1.7;
  flex: 1;
}

.showcase-more {
  margin-top: 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--clr-primary);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.showcase-more:hover {
  gap: 14px;
}

/* FAQ */
.faq-list {
  max-width: 780px;
  margin: 0 auto;
  display: grid;
  gap: 16px;
}

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

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

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

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

.faq-item summary .faq-icon {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0, 217, 255, 0.1);
  border: 1px solid var(--clr-border);
  color: var(--clr-primary);
  font-size: 13px;
  transition: var(--transition);
}

.faq-item[open] summary {
  color: var(--clr-primary);
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
  background: var(--clr-primary);
  color: #07101f;
}

.faq-answer {
  padding: 0 28px 24px;
  font-size: 15px;
  color: var(--clr-text-muted);
  line-height: 1.8;
}

/* CTA */
.cta-section {
  padding: 100px 0;
  position: relative;
  overflow: hidden;
  background: var(--clr-bg);
}

.cta-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  opacity: 0.16;
}

.cta-section::after {
  content: "";
  position: absolute;
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(0, 217, 255, 0.2), transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

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

.cta-content p {
  font-size: 16px;
  color: var(--clr-text-muted);
  margin-bottom: 36px;
}

.cta-btns {
  display: flex;
  gap: 18px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Footer */
.site-footer {
  background: var(--clr-bg);
  border-top: 1px solid var(--clr-border-soft);
  padding: 72px 0 0;
  position: relative;
}

.site-footer::before {
  content: "";
  display: block;
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--clr-primary), transparent);
  position: absolute;
  top: 0;
  left: 10%;
}

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

.footer-brand .brand-name {
  font-size: 22px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--clr-text-muted);
  margin-top: 16px;
  line-height: 1.8;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--clr-text);
}

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

.footer-col ul a {
  font-size: 14px;
  color: var(--clr-text-muted);
  transition: var(--transition);
}

.footer-col ul a:hover {
  color: var(--clr-primary);
  padding-left: 6px;
}

.footer-contact li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--clr-text-muted);
  margin-bottom: 14px;
}

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

.footer-bottom {
  border-top: 1px solid var(--clr-border-soft);
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: var(--clr-text-muted);
}

.footer-bottom a {
  color: var(--clr-primary);
}

/* 响应式 */
@media (max-width: 1024px) {
  :root {
    --header-h: 70px;
  }
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .showcase-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  .step-arrow {
    display: none;
  }
  .hero h1 {
    font-size: 42px;
  }
  .news-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .news-date {
    justify-content: flex-start;
  }
}

@media (max-width: 820px) {
  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(10, 14, 23, 0.98);
    flex-direction: column;
    padding: 20px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--clr-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    transition: transform 0.4s ease;
    backdrop-filter: blur(18px);
    z-index: 999;
  }
  .main-nav.open {
    transform: translateY(0);
  }
  .nav-item {
    width: 100%;
    text-align: center;
    font-size: 17px;
    padding: 14px 20px;
  }
  .nav-item.active::after {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .header-actions .btn {
    display: none;
  }
}

@media (max-width: 768px) {
  .category-grid {
    grid-template-columns: 1fr;
  }
  .hero {
    padding: 90px 0 100px;
  }
  .hero h1 {
    font-size: 34px;
  }
  .hero-sub {
    font-size: 15px;
  }
  .hero-metrics {
    gap: 28px;
  }
  .metric-num {
    font-size: 24px;
  }
  .section {
    padding: 70px 0;
  }
  .section-head h2 {
    font-size: 28px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

@media (max-width: 520px) {
  .container {
    padding: 0 18px;
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .showcase-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .stat-box .stat-num {
    font-size: 34px;
  }
  .brand-name {
    font-size: 16px;
  }
  .brand-badge {
    width: 36px;
    height: 36px;
    font-size: 13px;
  }
  .btn-lg {
    padding: 14px 24px;
    font-size: 15px;
  }
  .hero h1 {
    font-size: 28px;
  }
  .hero-actions {
    gap: 12px;
  }
  .news-item {
    padding: 20px;
  }
  .faq-item summary {
    padding: 18px 20px;
  }
  .faq-answer {
    padding: 0 20px 20px;
  }
  .category-card {
    min-height: 240px;
    padding: 24px;
  }
}

/* roulang page: category1 */
:root {
  --bg-dark: #0a0e17;
  --bg-panel: #111827;
  --bg-card: #161d2c;
  --bg-elevated: #1b2436;
  --neon: #00e5ff;
  --neon-secondary: #8b5cf6;
  --neon-glow: rgba(0, 229, 255, 0.35);
  --neon-glow-strong: rgba(0, 229, 255, 0.55);
  --text-main: #e8edf7;
  --text-muted: #8b93a7;
  --text-dim: #5e6678;
  --border: rgba(255, 255, 255, 0.07);
  --border-light: rgba(255, 255, 255, 0.14);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --shadow: 0 12px 34px rgba(0, 0, 0, 0.4);
  --shadow-neon: 0 0 22px rgba(0, 229, 255, 0.25);
  --transition: 0.25s ease;
  --header-h: 72px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg-dark);
  color: var(--text-main);
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { padding: 0; margin: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 14, 23, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-badge {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.2), rgba(139, 92, 246, 0.2));
  border: 1px solid rgba(0, 229, 255, 0.35);
  border-radius: 12px;
  color: var(--neon);
  font-size: 18px;
  box-shadow: var(--shadow-neon);
  transition: var(--transition);
}
.brand:hover .brand-badge { transform: rotate(-8deg) scale(1.05); box-shadow: 0 0 30px rgba(0, 229, 255, 0.4); }
.brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: linear-gradient(90deg, #e8edf7, #00e5ff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-item {
  position: relative;
  padding: 10px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-item:hover { color: var(--text-main); background: rgba(255, 255, 255, 0.05); }
.nav-item.active {
  color: var(--neon);
  background: rgba(0, 229, 255, 0.08);
  text-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
}
.nav-item.active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 18px;
  right: 18px;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), var(--neon-secondary));
  border-radius: 2px;
  box-shadow: 0 0 10px var(--neon-glow);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle .bar {
  width: 22px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-toggle:hover .bar { background: var(--neon); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 15px;
  padding: 12px 26px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-neon {
  background: linear-gradient(135deg, #00c8e0, #00e5ff);
  color: #061018;
  border: none;
  box-shadow: 0 4px 16px rgba(0, 229, 255, 0.3);
}
.btn-neon:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(0, 229, 255, 0.45); }
.btn-ghost {
  background: transparent;
  color: var(--text-main);
  border-color: var(--border-light);
}
.btn-ghost:hover { border-color: var(--neon); color: var(--neon); transform: translateY(-2px); }
.btn-sm { padding: 8px 18px; font-size: 14px; }
.btn-lg { padding: 16px 44px; font-size: 17px; }

/* ===== Page Hero ===== */
.page-hero {
  position: relative;
  padding: 110px 0 90px;
  background: url("/assets/images/backpic/back-1.png") center/cover no-repeat;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 14, 23, 0.88), rgba(10, 14, 23, 0.72) 55%, rgba(10, 14, 23, 0.94));
}
.page-hero .container { position: relative; text-align: center; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: 100px;
  color: var(--neon);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.15);
}
.page-hero h1 {
  font-size: 46px;
  line-height: 1.3;
  font-weight: 800;
  margin: 24px 0 16px;
  letter-spacing: 0.01em;
  background: linear-gradient(90deg, #ffffff, #b0f0ff, #00e5ff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.page-hero p {
  font-size: 18px;
  color: rgba(232, 237, 247, 0.8);
  max-width: 640px;
  margin: 0 auto 36px;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-meta {
  display: flex;
  justify-content: center;
  gap: 36px;
  margin-top: 48px;
  flex-wrap: wrap;
}
.hero-meta-item { text-align: center; }
.hero-meta-item strong { display: block; font-size: 28px; color: var(--neon); font-weight: 800; }
.hero-meta-item span { font-size: 14px; color: var(--text-muted); }

/* ===== Section Common ===== */
.section { padding: 90px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-tag {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.22);
  border-radius: 100px;
  color: var(--neon);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 18px;
}
.section-head h2 { font-size: 34px; font-weight: 800; margin: 0; line-height: 1.3; }
.section-head h2 span { color: var(--neon); }
.section-head p { color: var(--text-muted); font-size: 16px; margin-top: 14px; }
.bg-panel { background: var(--bg-panel); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

/* ===== Card Grid ===== */
.card-grid {
  display: grid;
  gap: 24px;
}
.card-grid.three { grid-template-columns: repeat(3, 1fr); }
.card-grid.two { grid-template-columns: repeat(2, 1fr); }

/* ===== Notice Cards ===== */
.notice-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.notice-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--neon), transparent);
  opacity: 0;
  transition: var(--transition);
}
.notice-card:hover { transform: translateY(-6px); border-color: rgba(0, 229, 255, 0.35); box-shadow: var(--shadow); }
.notice-card:hover::before { opacity: 1; }
.card-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: grid;
  place-items: center;
  background: rgba(0, 229, 255, 0.1);
  border-radius: 18px;
  color: var(--neon);
  font-size: 26px;
}
.notice-card h3 { font-size: 19px; font-weight: 700; margin: 0 0 12px; }
.notice-card p { color: var(--text-muted); font-size: 15px; margin: 0; line-height: 1.7; }

/* ===== Platform Cards ===== */
.platform-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.platform-card:hover { transform: translateY(-8px); border-color: rgba(0, 229, 255, 0.4); box-shadow: var(--shadow); }
.platform-thumb { position: relative; aspect-ratio: 16 / 9; overflow: hidden; }
.platform-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.platform-card:hover .platform-thumb img { transform: scale(1.05); }
.platform-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent, rgba(10, 14, 23, 0.55));
}
.platform-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 2;
  padding: 6px 14px;
  background: rgba(0, 229, 255, 0.85);
  color: #061018;
  font-size: 13px;
  font-weight: 700;
  border-radius: 100px;
}
.platform-body { padding: 24px; display: flex; flex-direction: column; flex: 1; }
.platform-body h3 { margin: 0 0 10px; font-size: 21px; font-weight: 700; }
.platform-body p { color: var(--text-muted); font-size: 15px; line-height: 1.7; margin: 0 0 18px; flex: 1; }
.platform-meta { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.platform-meta span { font-size: 13px; color: var(--text-dim); display: inline-flex; align-items: center; gap: 6px; }
.platform-meta i { color: var(--neon); }

/* ===== Steps ===== */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
.step-item {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 36px 24px 28px;
  transition: var(--transition);
  text-align: center;
}
.step-item::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--neon), var(--neon-secondary));
  color: #061018;
  font-weight: 800;
  font-size: 16px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.3);
}
.step-item:hover { transform: translateY(-6px); border-color: rgba(0, 229, 255, 0.35); box-shadow: var(--shadow); }
.step-icon { font-size: 30px; color: var(--neon); margin-bottom: 16px; }
.step-item h3 { font-size: 17px; font-weight: 700; margin: 0 0 10px; }
.step-item p { font-size: 14px; color: var(--text-muted); line-height: 1.65; margin: 0; }

/* ===== Version Cards ===== */
.version-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.version-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
}
.version-card.featured {
  border-color: rgba(0, 229, 255, 0.45);
  background: linear-gradient(180deg, rgba(0, 229, 255, 0.06), var(--bg-card));
  box-shadow: 0 0 30px rgba(0, 229, 255, 0.08);
}
.version-card:hover { transform: translateY(-8px); box-shadow: var(--shadow); }
.version-tag {
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 4px 14px;
  background: rgba(139, 92, 246, 0.18);
  border: 1px solid rgba(139, 92, 246, 0.4);
  color: #c4b5fd;
  font-size: 12px;
  font-weight: 600;
  border-radius: 100px;
}
.version-card h3 { font-size: 21px; font-weight: 700; margin: 0 0 6px; }
.version-card .sub { color: var(--text-dim); font-size: 14px; display: block; margin-bottom: 20px; }
.version-card p { color: var(--text-muted); font-size: 14px; line-height: 1.7; margin: 0 0 22px; flex: 1; }
.version-list { border-top: 1px solid var(--border); padding-top: 20px; }
.version-list li { display: flex; align-items: center; gap: 10px; color: var(--text-muted); font-size: 14px; padding: 6px 0; }
.version-list i { color: var(--neon); font-size: 13px; }

/* ===== FAQ ===== */
.faq-list { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item[open] { border-color: rgba(0, 229, 255, 0.35); box-shadow: var(--shadow); }
.faq-item summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 26px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.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(--neon);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}
.faq-item[open] summary { color: var(--neon); }
.faq-item[open] summary::after { transform: rotate(180deg); }
.faq-item summary:hover { background: rgba(0, 229, 255, 0.03); }
.faq-item .faq-answer { padding: 0 26px 24px; color: var(--text-muted); font-size: 15px; line-height: 1.8; }
.faq-item .faq-answer a { color: var(--neon); }

/* ===== CTA ===== */
.cta { padding: 40px 0 100px; }
.cta-box {
  position: relative;
  background: linear-gradient(135deg, #101a2c, #142238);
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  text-align: center;
  overflow: hidden;
}
.cta-box::before {
  content: "";
  position: absolute;
  top: -60%;
  left: -30%;
  width: 60%;
  height: 220%;
  background: radial-gradient(ellipse, rgba(0, 229, 255, 0.1), transparent 70%);
  pointer-events: none;
}
.cta-box::after {
  content: "";
  position: absolute;
  bottom: -60%;
  right: -30%;
  width: 60%;
  height: 220%;
  background: radial-gradient(ellipse, rgba(139, 92, 246, 0.1), transparent 70%);
  pointer-events: none;
}
.cta-box h2 { font-size: 34px; font-weight: 800; margin: 0 0 14px; }
.cta-box p { color: var(--text-muted); font-size: 16px; max-width: 560px; margin: 0 auto 32px; }
.cta-box .btn { position: relative; z-index: 2; }

/* ===== Footer ===== */
.site-footer {
  background: #080b12;
  border-top: 1px solid var(--border);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 44px;
}
.footer-brand .brand-name { font-size: 20px; }
.footer-brand p { color: var(--text-muted); font-size: 14px; line-height: 1.7; margin: 18px 0 0; max-width: 320px; }
.footer-col h4 { color: var(--text-main); font-size: 16px; font-weight: 600; margin: 0 0 20px; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a { color: var(--text-muted); font-size: 14px; transition: var(--transition); }
.footer-col ul li a:hover { color: var(--neon); }
.footer-contact li { display: flex; align-items: center; gap: 10px; color: var(--text-muted); font-size: 14px; }
.footer-contact i { color: var(--neon); width: 20px; text-align: center; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 26px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-bottom p { color: var(--text-dim); font-size: 13px; margin: 0; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .page-hero h1 { font-size: 38px; }
  .section { padding: 70px 0; }
  .section-head h2 { font-size: 30px; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); gap: 28px 20px; }
}
@media (max-width: 768px) {
  .header-inner { gap: 12px; }
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(10, 14, 23, 0.98);
    flex-direction: column;
    align-items: stretch;
    padding: 18px 24px 24px;
    gap: 6px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 16px 30px rgba(0, 0, 0, 0.5);
    transform: translateY(-120%);
    transition: transform 0.35s ease;
    z-index: 999;
  }
  .main-nav.open { transform: translateY(0); }
  .nav-item { padding: 13px 16px; font-size: 16px; text-align: center; }
  .nav-item.active::after { left: 30%; right: 30%; }
  .header-actions .btn { display: none; }
  .card-grid.three,
  .version-grid { grid-template-columns: 1fr; }
  .card-grid.two { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .page-hero { padding: 80px 0 60px; }
  .page-hero h1 { font-size: 32px; }
  .page-hero p { font-size: 16px; }
  .hero-meta { gap: 24px; }
  .section { padding: 56px 0; }
  .section-head { margin-bottom: 40px; }
  .cta-box { padding: 42px 26px; }
  .cta-box h2 { font-size: 26px; }
}
@media (max-width: 520px) {
  .container { padding: 0 18px; }
  .page-hero h1 { font-size: 26px; }
  .brand-name { font-size: 15px; }
  .brand-badge { width: 34px; height: 34px; font-size: 15px; border-radius: 10px; }
  .steps-grid { grid-template-columns: 1fr; }
  .hero-meta { flex-direction: column; gap: 16px; }
  .btn { width: 100%; }
  .hero-actions { flex-direction: column; width: 100%; }
  .section-head h2 { font-size: 25px; }
  .faq-item summary { padding: 18px 18px; font-size: 15px; }
  .faq-item .faq-answer { padding: 0 18px 20px; font-size: 14px; }
  .footer-bottom { justify-content: center; text-align: center; }
}

/* roulang page: article */
:root {
  --bg-body: #080d18;
  --bg-header: rgba(8, 13, 24, 0.94);
  --bg-section: #0c1322;
  --bg-card: #111a2c;
  --bg-elev: #16213a;
  --bg-deep: #060a13;
  --neon-cyan: #00e5ff;
  --neon-pink: #ff2d87;
  --neon-purple: #8b5cf6;
  --text-main: #e9edf4;
  --text-sub: #b4c0d4;
  --text-weak: #7c8ba1;
  --border-color: rgba(255,255,255,.08);
  --border-neon: rgba(0,229,255,.35);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-card: 0 12px 40px rgba(0,0,0,.38);
  --shadow-neon: 0 0 24px rgba(0,229,255,.16);
  --glow-cyan: 0 0 18px rgba(0,229,255,.28);
  --glow-pink: 0 0 18px rgba(255,45,135,.28);
  --font: -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;
  --container-w: 1200px;
  --sp: 32px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg-body);color:var(--text-main);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color .25s}
ul,ol{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
.container{max-width:var(--container-w);margin:0 auto;padding:0 24px}

/* ===== Header / Nav ===== */
.site-header{position:sticky;top:0;z-index:100;background:var(--bg-header);backdrop-filter:blur(18px);border-bottom:1px solid var(--border-color);box-shadow:0 4px 30px rgba(0,0,0,.35)}
.site-header::after{content:"";display:block;height:2px;background:linear-gradient(90deg,transparent,var(--neon-cyan),var(--neon-pink),transparent)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:74px;gap:20px;position:relative}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand-badge{width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--neon-cyan),var(--neon-purple));color:#08121f;font-size:20px;box-shadow:var(--glow-cyan)}
.brand-name{font-size:20px;font-weight:800;letter-spacing:.5px;background:linear-gradient(90deg,var(--neon-cyan),#fff,var(--neon-pink));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:6px}
.nav-item{padding:9px 18px;border-radius:var(--radius-sm);font-weight:600;font-size:15px;color:var(--text-sub);position:relative;transition:color .25s,background .25s,box-shadow .25s}
.nav-item:hover{color:#fff;background:rgba(0,229,255,.08)}
.nav-item.active{color:var(--neon-cyan);text-shadow:0 0 12px rgba(0,229,255,.5);background:rgba(0,229,255,.08);box-shadow:inset 0 0 0 1px var(--border-neon)}
.nav-item.active::after{content:"";position:absolute;left:50%;bottom:-1px;transform:translateX(-50%);width:60%;height:2px;background:var(--neon-cyan);box-shadow:var(--glow-cyan);border-radius:2px}
.header-actions{display:flex;align-items:center;gap:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:11px 24px;border-radius:999px;font-weight:700;font-size:15px;transition:all .3s;white-space:nowrap}
.btn-neon{background:linear-gradient(90deg,var(--neon-cyan),var(--neon-purple));color:#08121f;box-shadow:var(--glow-cyan)}
.btn-neon:hover{transform:translateY(-2px);box-shadow:0 6px 28px rgba(0,229,255,.45)}
.btn-ghost{background:rgba(255,255,255,.05);color:var(--text-main);border:1px solid var(--border-color)}
.btn-ghost:hover{background:rgba(255,255,255,.1);border-color:var(--border-neon);color:var(--neon-cyan)}
.btn-sm{padding:8px 18px;font-size:13px}
.btn-lg{padding:15px 36px;font-size:17px}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px;border-radius:8px;background:rgba(255,255,255,.04)}
.nav-toggle .bar{width:24px;height:2px;background:var(--text-main);border-radius:2px;transition:all .3s}
.nav-toggle:hover .bar{background:var(--neon-cyan)}

/* ===== Article Hero ===== */
.article-hero{position:relative;padding:88px 0 72px;background-size:cover;background-position:center;isolation:isolate}
.article-hero::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,10,19,.88) 0%,rgba(8,13,24,.82) 60%,var(--bg-body) 100%);z-index:-1}
.article-hero .container{position:relative;z-index:2}
.breadcrumb{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text-weak);margin-bottom:24px;flex-wrap:wrap}
.breadcrumb a{color:var(--text-sub);transition:color .25s}
.breadcrumb a:hover{color:var(--neon-cyan)}
.breadcrumb .sep{color:var(--text-weak);opacity:.6}
.article-hero .badge{display:inline-flex;align-items:center;gap:7px;padding:5px 16px;border-radius:999px;background:rgba(0,229,255,.1);border:1px solid var(--border-neon);color:var(--neon-cyan);font-size:13px;font-weight:700;letter-spacing:.5px;margin-bottom:22px}
.article-hero .badge i{font-size:12px}
.article-hero .hero-date{display:inline-flex;align-items:center;gap:7px;color:var(--text-weak);font-size:14px;margin-left:14px}
.article-hero h1{font-size:clamp(28px,4.5vw,46px);font-weight:800;line-height:1.28;margin-bottom:18px;letter-spacing:.5px}
.article-hero .article-desc{font-size:17px;color:var(--text-sub);max-width:760px;line-height:1.75}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.tag{display:inline-flex;align-items:center;gap:5px;padding:5px 14px;border-radius:999px;background:rgba(255,255,255,.05);border:1px solid var(--border-color);font-size:13px;color:var(--text-sub)}
.tag:hover{border-color:var(--border-neon);color:var(--neon-cyan)}

/* ===== Article Body Layout ===== */
.article-body{padding:56px 0 70px}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:42px;align-items:start}
.article-main{min-width:0}
.article-content{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:38px 42px;box-shadow:var(--shadow-card)}
.article-content hr{border:none;height:1px;background:var(--border-color);margin:30px 0}
.article-content p{margin-bottom:20px;font-size:16.5px;color:var(--text-sub)}
.article-content h2{font-size:24px;font-weight:800;margin:36px 0 16px;padding-left:16px;border-left:4px solid var(--neon-cyan);color:var(--text-main)}
.article-content h3{font-size:19px;font-weight:700;margin:28px 0 12px;color:var(--text-main)}
.article-content ul,.article-content ol{margin-bottom:20px;padding-left:8px}
.article-content ul li,.article-content ol li{position:relative;padding:7px 0 7px 24px;color:var(--text-sub);font-size:16px}
.article-content ul li::before{content:"\f00c";font-family:"Font Awesome 6 Free";font-weight:900;position:absolute;left:0;top:7px;font-size:13px;color:var(--neon-cyan)}
.article-content ol{counter-reset:item}
.article-content ol li::before{content:counter(item);counter-increment:item;position:absolute;left:0;top:7px;width:22px;height:22px;background:rgba(0,229,255,.12);border:1px solid var(--border-neon);color:var(--neon-cyan);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700}
.article-content blockquote{margin:24px 0;padding:18px 24px;background:rgba(139,92,246,.08);border-left:4px solid var(--neon-purple);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--text-sub);font-style:italic}
.article-content img{border-radius:var(--radius-md);margin:20px 0;box-shadow:var(--shadow-card)}
.article-content a{color:var(--neon-cyan);border-bottom:1px solid var(--border-neon)}
.article-content a:hover{color:#fff}
.article-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border-color)}
.article-tags .tag i{color:var(--neon-cyan);font-size:12px}

/* ===== Sidebar ===== */
.article-side{display:flex;flex-direction:column;gap:24px;position:sticky;top:100px}
.side-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:26px;box-shadow:var(--shadow-card)}
.side-card h3{font-size:17px;font-weight:800;margin-bottom:18px;display:flex;align-items:center;gap:9px;padding-bottom:14px;border-bottom:1px solid var(--border-color)}
.side-card h3 i{color:var(--neon-cyan)}
.side-info-list li{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px solid rgba(255,255,255,.04);font-size:14px;color:var(--text-sub)}
.side-info-list li:last-child{border-bottom:none}
.side-info-list li span:first-child{color:var(--text-weak)}
.side-info-list li span:last-child{color:var(--text-main);text-align:right;max-width:60%}
.side-cate-list li{margin-bottom:8px}
.side-cate-list a{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-radius:var(--radius-sm);background:rgba(255,255,255,.03);border:1px solid var(--border-color);font-size:14px;font-weight:600;color:var(--text-sub);transition:all .3s}
.side-cate-list a:hover{background:rgba(0,229,255,.07);border-color:var(--border-neon);color:var(--neon-cyan);transform:translateX(4px)}
.side-cate-list a i{font-size:12px;opacity:.6}
.side-post-list li{margin-bottom:10px}
.side-post-list a{display:flex;flex-direction:column;gap:4px;padding:12px 14px;border-radius:var(--radius-sm);background:rgba(255,255,255,.02);border:1px solid transparent;transition:all .28s}
.side-post-list a:hover{background:rgba(255,255,255,.05);border-color:var(--border-neon)}
.side-post-title{font-size:14px;font-weight:600;color:var(--text-main);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.side-post-date{font-size:12px;color:var(--text-weak)}
.side-cta{background:linear-gradient(145deg,rgba(0,229,255,.08),rgba(139,92,246,.08));text-align:center;padding:30px 22px}
.side-cta h4{font-size:18px;font-weight:800;margin-bottom:8px}
.side-cta p{font-size:13px;color:var(--text-weak);margin-bottom:18px}
.side-empty{color:var(--text-weak);font-size:14px;text-align:center;padding:20px 0}

/* ===== Not Found ===== */
.notfound-box{text-align:center;padding:90px 40px;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-card)}
.notfound-icon{width:90px;height:90px;margin:0 auto 26px;border-radius:50%;background:rgba(255,45,135,.1);border:1px solid rgba(255,45,135,.3);display:flex;align-items:center;justify-content:center;font-size:34px;color:var(--neon-pink)}
.notfound-box h2{font-size:30px;font-weight:800;margin-bottom:12px}
.notfound-box p{color:var(--text-weak);font-size:15px;margin-bottom:30px}

/* ===== Related Section ===== */
.related-section{padding:70px 0;background:var(--bg-section)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:38px;gap:20px;flex-wrap:wrap}
.section-head h2{font-size:clamp(24px,3vw,34px);font-weight:800;position:relative;padding-bottom:12px}
.section-head h2::after{content:"";position:absolute;left:0;bottom:0;width:54px;height:3px;border-radius:3px;background:linear-gradient(90deg,var(--neon-cyan),var(--neon-pink));box-shadow:var(--glow-cyan)}
.section-head p{color:var(--text-weak);font-size:15px;margin-top:8px;max-width:600px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.related-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);overflow:hidden;transition:transform .35s,box-shadow .35s,border-color .35s;display:flex;flex-direction:column}
.related-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-card),var(--shadow-neon);border-color:var(--border-neon)}
.related-card .thumb{position:relative;height:170px;overflow:hidden}
.related-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.related-card:hover .thumb img{transform:scale(1.05)}
.related-card .thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(8,13,24,.85))}
.related-card .cate-label{position:absolute;top:14px;left:14px;z-index:2;padding:4px 13px;border-radius:999px;background:rgba(0,229,255,.16);border:1px solid var(--border-neon);color:var(--neon-cyan);font-size:12px;font-weight:700;backdrop-filter:blur(8px)}
.related-card .r-body{padding:22px 22px 24px;flex:1;display:flex;flex-direction:column}
.related-card h3{font-size:17px;font-weight:700;line-height:1.5;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.related-card h3 a:hover{color:var(--neon-cyan)}
.related-card .r-desc{font-size:14px;color:var(--text-weak);line-height:1.65;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:14px}
.related-card .r-meta{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:14px;border-top:1px solid var(--border-color);font-size:13px;color:var(--text-weak)}
.related-card .r-meta i{color:var(--neon-cyan);margin-right:5px}

/* ===== FAQ ===== */
.faq-section{padding:70px 0;background:var(--bg-body)}
.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.faq-item{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:26px 28px;transition:border-color .3s,transform .3s}
.faq-item:hover{border-color:var(--border-neon);transform:translateY(-3px)}
.faq-item h3{font-size:16.5px;font-weight:700;margin-bottom:10px;display:flex;align-items:flex-start;gap:10px;color:var(--text-main)}
.faq-item h3 i{color:var(--neon-cyan);margin-top:4px;font-size:15px}
.faq-item p{font-size:14.5px;color:var(--text-weak);line-height:1.7;padding-left:25px}

/* ===== CTA ===== */
.cta-section{padding:80px 0;background:var(--bg-section);position:relative;overflow:hidden}
.cta-section::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 60% 80% at 50% 100%,rgba(0,229,255,.12),transparent 70%)}
.cta-box{position:relative;z-index:2;max-width:820px;margin:0 auto;text-align:center;background:var(--bg-card);border:1px solid var(--border-neon);border-radius:var(--radius-lg);padding:58px 50px;box-shadow:var(--shadow-card),var(--shadow-neon)}
.cta-box h2{font-size:clamp(24px,3.4vw,36px);font-weight:800;margin-bottom:14px}
.cta-box p{color:var(--text-sub);font-size:16px;margin-bottom:30px;max-width:560px;margin-left:auto;margin-right:auto}
.cta-box .btn-group{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.cta-note{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:22px;font-size:13px;color:var(--text-weak)}
.cta-note i{color:var(--neon-cyan)}

/* ===== Footer ===== */
.site-footer{background:var(--bg-deep);border-top:1px solid var(--border-color);position:relative}
.site-footer::before{content:"";display:block;height:2px;background:linear-gradient(90deg,transparent,var(--neon-purple),var(--neon-cyan),transparent)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:44px;padding:60px 0 44px}
.footer-brand p{font-size:14px;color:var(--text-weak);margin-top:14px;max-width:300px;line-height:1.7}
.footer-col h4{font-size:16px;font-weight:700;margin-bottom:18px;color:var(--text-main)}
.footer-col ul li{margin-bottom:11px}
.footer-col ul a{color:var(--text-sub);font-size:14px;transition:color .25s,padding-left .25s}
.footer-col ul a:hover{color:var(--neon-cyan);padding-left:5px}
.footer-contact li{display:flex;align-items:center;gap:10px;color:var(--text-sub);font-size:14px}
.footer-contact i{color:var(--neon-cyan);width:16px}
.footer-bottom{border-top:1px solid var(--border-color);padding:22px 0;text-align:center;font-size:13px;color:var(--text-weak)}
.footer-bottom p{margin-bottom:4px}

/* ===== Responsive ===== */
@media (max-width:1024px){
  .article-layout{grid-template-columns:1fr;gap:32px}
  .article-side{position:static;flex-direction:row;flex-wrap:wrap;gap:20px}
  .side-card{flex:1 1 280px}
  .related-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
}
@media (max-width:768px){
  .header-inner{height:64px;flex-wrap:wrap}
  .main-nav{position:fixed;top:66px;left:0;right:0;background:var(--bg-header);flex-direction:column;align-items:stretch;padding:16px 24px 24px;gap:4px;border-bottom:1px solid var(--border-color);transform:translateY(-120%);opacity:0;pointer-events:none;transition:transform .35s,opacity .3s;backdrop-filter:blur(20px);z-index:99;box-shadow:0 20px 40px rgba(0,0,0,.4)}
  .main-nav.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .main-nav .nav-item{padding:14px 16px;text-align:center;font-size:16px}
  .nav-item.active::after{display:none}
  .nav-toggle{display:flex}
  .header-actions .btn-neon{display:none}
  .article-hero{padding:54px 0 48px}
  .article-content{padding:26px 22px}
  .related-grid{grid-template-columns:1fr}
  .faq-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding:44px 0 32px}
  .cta-box{padding:42px 26px}
  .cta-box .btn-group{flex-direction:column}
  .section-head{flex-direction:column;align-items:flex-start}
}
@media (max-width:520px){
  .container{padding:0 18px}
  .brand-name{font-size:16px}
  .brand-badge{width:36px;height:36px;font-size:17px}
  .article-hero h1{font-size:25px}
  .article-content{padding:22px 18px}
  .notfound-box{padding:60px 22px}
  .related-card .thumb{height:150px}
  .footer-col h4{font-size:15px}
  .btn-lg{width:100%}
}
@media (max-width:380px){
  .brand-name{letter-spacing:0}
}

/* roulang page: category2 */
/* ========== Design Variables ========== */
        :root {
            --bg-primary: #0b0f1a;
            --bg-secondary: #0f1626;
            --bg-card: #141d30;
            --bg-elevated: #1c2740;
            --border: rgba(99, 102, 241, 0.16);
            --border-light: rgba(255, 255, 255, 0.06);
            --primary: #6366f1;
            --primary-glow: #818cf8;
            --primary-deep: #4f46e5;
            --accent: #06b6d4;
            --accent-glow: #22d3ee;
            --success: #10b981;
            --warning: #f59e0b;
            --text-primary: #f1f5f9;
            --text-secondary: #a3b1cc;
            --text-muted: #64748b;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 8px;
            --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
            --shadow-glow: 0 0 32px rgba(99, 102, 241, 0.18);
            --shadow-accent: 0 0 24px rgba(6, 182, 212, 0.15);
            --transition: 0.3s ease;
            --header-h: 76px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

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

        img {
            max-width: 100%;
            display: block;
            border-radius: var(--radius);
        }

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

        input,
        select,
        textarea {
            font-family: inherit;
            font-size: 14px;
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border);
            border-radius: var(--radius-xs);
            padding: 10px 14px;
            outline: none;
            transition: border-color var(--transition), box-shadow var(--transition);
        }

        input:focus,
        select:focus,
        textarea:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
        }

        ul {
            list-style: none;
        }

        ::selection {
            background: rgba(99, 102, 241, 0.35);
            color: #fff;
        }

        /* ========== Container ========== */
        .container {
            width: 100%;
            max-width: 1220px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== Header / Nav ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(11, 15, 26, 0.86);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
        }

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

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

        .brand-badge {
            width: 40px;
            height: 40px;
            border-radius: 12px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            font-size: 18px;
            box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
            transition: transform var(--transition), box-shadow var(--transition);
        }

        .brand:hover .brand-badge {
            transform: rotate(-6deg) scale(1.05);
            box-shadow: 0 6px 24px rgba(99, 102, 241, 0.55);
        }

        .brand-name {
            font-size: 20px;
            font-weight: 750;
            letter-spacing: 0.02em;
            background: linear-gradient(120deg, #fff 60%, var(--primary-glow));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            white-space: nowrap;
        }

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

        .nav-item {
            position: relative;
            padding: 9px 20px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: 10px;
            transition: color var(--transition), background var(--transition), box-shadow var(--transition);
        }

        .nav-item:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-item.active {
            color: #fff;
            font-weight: 600;
            background: rgba(99, 102, 241, 0.14);
            box-shadow: inset 0 0 0 1px rgba(99, 102, 241, 0.35), 0 0 20px rgba(99, 102, 241, 0.12);
        }

        .nav-item.active::after {
            content: "";
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 32px;
            height: 3px;
            border-radius: 3px;
            background: linear-gradient(90deg, var(--primary-glow), var(--accent));
            box-shadow: 0 0 12px rgba(99, 102, 241, 0.8);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 15px;
            font-weight: 600;
            padding: 11px 24px;
            border-radius: 12px;
            transition: all var(--transition);
            border: 1px solid transparent;
            cursor: pointer;
            white-space: nowrap;
        }

        .btn-neon {
            background: linear-gradient(135deg, var(--primary), var(--primary-deep));
            color: #fff;
            box-shadow: 0 4px 20px rgba(99, 102, 241, 0.35);
        }

        .btn-neon:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 32px rgba(99, 102, 241, 0.5);
            filter: brightness(1.08);
        }

        .btn-neon-outline {
            background: transparent;
            border-color: var(--primary-glow);
            color: var(--primary-glow);
        }

        .btn-neon-outline:hover {
            background: rgba(99, 102, 241, 0.12);
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }

        .btn-accent {
            background: linear-gradient(135deg, var(--accent), #0891b2);
            color: #fff;
            box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
        }

        .btn-accent:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(6, 182, 212, 0.45);
        }

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

        .btn-lg {
            padding: 15px 34px;
            font-size: 16px;
            border-radius: 14px;
        }

        .btn:focus-visible {
            outline: 3px solid rgba(99, 102, 241, 0.45);
            outline-offset: 3px;
        }

        /* Nav Toggle */
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 10px 8px;
            border-radius: 10px;
            border: 1px solid var(--border);
            background: rgba(255, 255, 255, 0.04);
            transition: background var(--transition);
        }

        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        .nav-toggle .bar {
            width: 20px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 3px;
            transition: transform var(--transition), opacity var(--transition);
        }

        .nav-toggle.open .bar:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-toggle.open .bar:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.open .bar:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ========== Hero ========== */
        .hero {
            position: relative;
            padding: 130px 0 110px;
            background: linear-gradient(160deg, rgba(11, 15, 26, 0.88), rgba(15, 22, 38, 0.72)), url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            overflow: hidden;
        }

        .hero::before {
            content: "";
            position: absolute;
            width: 420px;
            height: 420px;
            top: -160px;
            right: -80px;
            background: radial-gradient(circle, rgba(99, 102, 241, 0.28), transparent 70%);
            border-radius: 50%;
            z-index: 1;
        }

        .hero::after {
            content: "";
            position: absolute;
            width: 350px;
            height: 350px;
            bottom: -130px;
            left: -100px;
            background: radial-gradient(circle, rgba(6, 182, 212, 0.16), transparent 70%);
            border-radius: 50%;
            z-index: 1;
        }

        .hero .container {
            position: relative;
            z-index: 2;
        }

        .hero-content {
            max-width: 760px;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(99, 102, 241, 0.14);
            border: 1px solid rgba(99, 102, 241, 0.35);
            color: var(--primary-glow);
            padding: 7px 18px;
            border-radius: 100px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.04em;
            margin-bottom: 22px;
            box-shadow: var(--shadow-glow);
        }

        .hero-tag i {
            font-size: 12px;
        }

        .hero h1 {
            font-size: 44px;
            line-height: 1.2;
            font-weight: 800;
            letter-spacing: -0.01em;
            background: linear-gradient(120deg, #fff 40%, var(--primary-glow) 80%, var(--accent-glow));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 20px;
        }

        .hero p {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 610px;
            margin-bottom: 34px;
            line-height: 1.75;
        }

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

        .hero-stats {
            display: flex;
            gap: 36px;
            margin-top: 50px;
            padding-top: 30px;
            border-top: 1px solid var(--border-light);
            flex-wrap: wrap;
        }

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

        .hero-stat .num {
            font-size: 28px;
            font-weight: 750;
            color: #fff;
        }

        .hero-stat .num span {
            color: var(--accent-glow);
        }

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

        /* ========== Section Common ========== */
        .section {
            padding: 90px 0;
        }

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

        .section-head {
            max-width: 720px;
            margin-bottom: 50px;
        }

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

        .section-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--primary-glow);
            font-size: 13px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            margin-bottom: 12px;
        }

        .section-eyebrow i {
            font-size: 12px;
        }

        .section-head h2 {
            font-size: 34px;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -0.01em;
            margin-bottom: 14px;
        }

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

        /* ========== Card ========== */
        .card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 26px;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
        }

        .card:hover {
            transform: translateY(-4px);
            border-color: rgba(99, 102, 241, 0.35);
            box-shadow: var(--shadow), var(--shadow-glow);
        }

        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(6, 182, 212, 0.14));
            border: 1px solid rgba(99, 102, 241, 0.25);
            color: var(--primary-glow);
            font-size: 20px;
            margin-bottom: 18px;
        }

        .card h3 {
            font-size: 19px;
            font-weight: 650;
            margin-bottom: 10px;
        }

        .card p {
            color: var(--text-secondary);
            font-size: 14.5px;
            line-height: 1.65;
        }

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

        .card-link:hover {
            gap: 10px;
            color: #fff;
        }

        /* ========== Overview Grid ========== */
        .overview-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        /* ========== Guide Cards ========== */
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .guide-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            display: flex;
            flex-direction: column;
        }

        .guide-card:hover {
            transform: translateY(-6px);
            border-color: rgba(99, 102, 241, 0.4);
            box-shadow: var(--shadow), var(--shadow-glow);
        }

        .guide-cover {
            position: relative;
            height: 200px;
            overflow: hidden;
        }

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

        .guide-card:hover .guide-cover img {
            transform: scale(1.06);
        }

        .guide-cat {
            position: absolute;
            top: 14px;
            left: 14px;
            background: rgba(11, 15, 26, 0.75);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.14);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 100px;
        }

        .guide-body {
            padding: 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .guide-body h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .guide-body h3 a:hover {
            color: var(--primary-glow);
        }

        .guide-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
            flex: 1;
        }

        .guide-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 12.5px;
            color: var(--text-muted);
            margin-top: 18px;
            padding-top: 14px;
            border-top: 1px solid var(--border-light);
        }

        .guide-meta i {
            color: var(--primary-glow);
            margin-right: 4px;
        }

        /* ========== Badge / Tag ========== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 14px;
            font-size: 12.5px;
            font-weight: 600;
            border-radius: 100px;
            background: rgba(99, 102, 241, 0.12);
            border: 1px solid rgba(99, 102, 241, 0.28);
            color: var(--primary-glow);
            transition: background var(--transition), border-color var(--transition);
        }

        .badge:hover {
            background: rgba(99, 102, 241, 0.22);
            border-color: var(--primary-glow);
        }

        .badge-accent {
            background: rgba(6, 182, 212, 0.12);
            border-color: rgba(6, 182, 212, 0.28);
            color: var(--accent-glow);
        }

        .badge-accent:hover {
            background: rgba(6, 182, 212, 0.22);
            border-color: var(--accent-glow);
        }

        .badge-success {
            background: rgba(16, 185, 129, 0.12);
            border-color: rgba(16, 185, 129, 0.3);
            color: var(--success);
        }

        /* ========== Beginner Flow ========== */
        .flow-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            counter-reset: flow;
        }

        .flow-step {
            position: relative;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 34px 26px 28px;
            transition: transform var(--transition), box-shadow var(--transition);
        }

        .flow-step:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow), var(--shadow-glow);
        }

        .flow-step::before {
            counter-increment: flow;
            content: "0" counter(flow);
            position: absolute;
            top: 16px;
            right: 20px;
            font-size: 34px;
            font-weight: 800;
            color: rgba(99, 102, 241, 0.35);
            line-height: 1;
        }

        .flow-step .flow-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.22), rgba(6, 182, 212, 0.14));
            border: 1px solid rgba(99, 102, 241, 0.25);
            color: var(--primary-glow);
            font-size: 18px;
            margin-bottom: 18px;
        }

        .flow-step h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .flow-step p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* ========== Advanced Tips ========== */
        .tips-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .tips-visual img {
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }

        .tips-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .tips-item {
            display: flex;
            gap: 20px;
            padding: 26px 0;
            border-bottom: 1px solid var(--border-light);
        }

        .tips-item:first-child {
            padding-top: 0;
        }

        .tips-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .tips-index {
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            flex-shrink: 0;
            width: 36px;
            text-align: center;
            opacity: 0.75;
        }

        .tips-content h3 {
            font-size: 18px;
            font-weight: 650;
            margin-bottom: 6px;
        }

        .tips-content p {
            font-size: 14.5px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* ========== Mode Analysis ========== */
        .mode-section {
            background: linear-gradient(150deg, rgba(15, 22, 38, 0.97), rgba(11, 15, 26, 0.99)), url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            border-radius: var(--radius);
            padding: 56px;
            border: 1px solid var(--border);
        }

        .mode-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 40px;
        }

        .mode-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 24px;
            transition: background var(--transition), border-color var(--transition), transform var(--transition);
        }

        .mode-card:hover {
            background: rgba(99, 102, 241, 0.08);
            border-color: rgba(99, 102, 241, 0.4);
            transform: translateY(-3px);
        }

        .mode-card .icon {
            font-size: 24px;
            color: var(--primary-glow);
            margin-bottom: 14px;
        }

        .mode-card h4 {
            font-size: 16.5px;
            font-weight: 650;
            margin-bottom: 8px;
        }

        .mode-card p {
            font-size: 13.5px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 12px;
        }

        .mode-card .badge {
            font-size: 11.5px;
            padding: 4px 10px;
        }

        /* ========== FAQ ========== */
        .faq-wrap {
            max-width: 820px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 14px;
            overflow: hidden;
            transition: border-color var(--transition), box-shadow var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(99, 102, 241, 0.35);
        }

        .faq-item summary {
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 22px 26px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            transition: background var(--transition);
        }

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

        .faq-item summary:hover {
            background: rgba(255, 255, 255, 0.03);
        }

        .faq-item summary .faq-arrow {
            font-size: 14px;
            color: var(--primary-glow);
            transition: transform var(--transition);
            flex-shrink: 0;
        }

        .faq-item[open] summary .faq-arrow {
            transform: rotate(45deg);
        }

        .faq-item[open] summary {
            border-bottom: 1px solid var(--border-light);
        }

        .faq-item .faq-answer {
            padding: 0 26px 24px;
            font-size: 14.5px;
            color: var(--text-secondary);
            line-height: 1.75;
        }

        .faq-item .faq-answer a {
            color: var(--accent-glow);
        }

        .faq-item .faq-answer a:hover {
            text-decoration: underline;
        }

        /* ========== CTA ========== */
        .cta-section {
            padding: 100px 0;
            position: relative;
            background: linear-gradient(150deg, rgba(11, 15, 26, 0.9), rgba(15, 22, 38, 0.82)), url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            text-align: center;
        }

        .cta-inner {
            max-width: 720px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .cta-inner h2 {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .cta-inner p {
            color: var(--text-secondary);
            font-size: 16px;
            margin-bottom: 34px;
        }

        .cta-btns {
            display: flex;
            justify-content: center;
            gap: 18px;
            flex-wrap: wrap;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: #070b14;
            border-top: 1px solid var(--border);
            padding-top: 64px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 44px;
        }

        .footer-brand .brand {
            margin-bottom: 14px;
        }

        .footer-brand p {
            color: var(--text-muted);
            font-size: 14px;
            max-width: 320px;
            line-height: 1.7;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 650;
            margin-bottom: 16px;
            color: #fff;
        }

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

        .footer-col a {
            color: var(--text-muted);
            font-size: 14px;
            transition: color var(--transition);
        }

        .footer-col a:hover {
            color: var(--primary-glow);
        }

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

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

        .footer-bottom {
            border-top: 1px solid var(--border-light);
            padding: 22px 0;
            text-align: center;
            color: var(--text-muted);
            font-size: 13px;
        }

        /* ========== Responsive ========== */
        @media (max-width: 1024px) {
            .overview-grid {
                grid-template-columns: repeat(2, 1fr);
            }

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

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

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

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

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

        @media (max-width: 768px) {
            .main-nav {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(11, 15, 26, 0.98);
                flex-direction: column;
                align-items: stretch;
                padding: 16px 24px;
                gap: 6px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow);
                transform: translateY(-110%);
                transition: transform 0.35s ease;
                z-index: 999;
            }

            .main-nav.open {
                transform: translateY(0);
            }

            .nav-item {
                padding: 14px 18px;
                font-size: 16px;
                text-align: center;
                border-radius: 12px;
            }

            .nav-item.active::after {
                display: none;
            }

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

            .header-inner .btn-neon {
                display: none;
            }

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

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

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

            .hero-stats {
                gap: 20px;
                margin-top: 36px;
                padding-top: 22px;
            }

            .section {
                padding: 64px 0;
            }

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

            .guide-grid,
            .overview-grid,
            .flow-grid,
            .mode-grid {
                grid-template-columns: 1fr;
            }

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

            .mode-section {
                padding: 32px 22px;
            }

            .cta-section {
                padding: 64px 0;
            }

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

        @media (max-width: 520px) {
            .container {
                padding: 0 18px;
            }

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

            .brand-badge {
                width: 34px;
                height: 34px;
                font-size: 15px;
            }

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

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

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

            .guide-cover {
                height: 170px;
            }

            .tips-item {
                flex-direction: column;
                gap: 8px;
                padding: 20px 0;
            }

            .tips-index {
                text-align: left;
            }

            .footer-bottom p {
                font-size: 12px;
            }
        }

        /* ========== Scrollbar ========== */
        ::-webkit-scrollbar {
            width: 10px;
            height: 8px;
        }

        ::-webkit-scrollbar-track {
            background: var(--bg-primary);
        }

        ::-webkit-scrollbar-thumb {
            background: #2a3550;
            border-radius: 6px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: #3b4a6b;
        }