/* roulang page: index */
:root {
  --bg-primary: #05070D;
  --bg-deep: #0A101D;
  --bg-panel: #0F172A;
  --glass-bg: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.08);
  --accent: #00D4FF;
  --accent-2: #00F5A0;
  --accent-gradient: linear-gradient(135deg, #00D4FF 0%, #00F5A0 100%);
  --orange: #FF8A00;
  --orange-hover: #FF9E33;
  --text-title: #F5F8FF;
  --text-body: #A8B3CC;
  --text-weak: #6C7A96;
  --success: #34D399;
  --warning: #F87171;
  --info: #60A5FA;
  --radius-card: 16px;
  --radius-btn: 10px;
  --radius-hero: 24px;
  --radius-tag: 999px;
  --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.35);
  --shadow-orange: 0 0 24px rgba(255, 138, 0, 0.25);
  --container: 1200px;
  --p-desktop: 24px;
  --p-mobile: 16px;
  --space-section: 72px;
  --space-section-mobile: 48px;
  --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  font-size: 16px;
}
body {
  font-family: var(--font-stack);
  background-color: var(--bg-primary);
  background-image: linear-gradient(120deg, rgba(0, 212, 255, 0.06), transparent 40%), linear-gradient(300deg, rgba(0, 245, 160, 0.04), transparent 30%);
  background-attachment: fixed;
  color: var(--text-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}
button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}
input, textarea {
  font-family: inherit;
  font-size: 15px;
}
ul, ol {
  list-style: none;
}
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid #00D4FF;
  outline-offset: 2px;
}
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--p-desktop);
  padding-right: var(--p-desktop);
}
.section {
  padding-top: var(--space-section);
  padding-bottom: var(--space-section);
}
.section-header {
  margin-bottom: 40px;
}
.section-header.center {
  text-align: center;
}
.section-header.center .section-title::after {
  left: 50%;
  transform: translateX(-50%);
}
.section-title {
  font-size: 34px;
  font-weight: 700;
  color: var(--text-title);
  line-height: 1.25;
  letter-spacing: 0.5px;
  position: relative;
  padding-bottom: 20px;
  margin-bottom: 16px;
}
.section-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--accent-gradient);
  border-radius: 3px;
  box-shadow: var(--shadow-glow);
}
.section-desc {
  font-size: 16px;
  color: var(--text-body);
  max-width: 640px;
  line-height: 1.7;
}
.section-desc.center {
  margin-left: auto;
  margin-right: auto;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 28px;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: all 0.25s ease;
  white-space: nowrap;
}
.btn-orange {
  background: var(--orange);
  color: #fff;
  box-shadow: var(--shadow-orange);
}
.btn-orange:hover {
  background: var(--orange-hover);
  transform: translateY(-1px);
  box-shadow: 0 0 28px rgba(255, 158, 51, 0.35);
}
.btn-outline-accent {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}
.btn-outline-accent:hover {
  background: rgba(0, 212, 255, 0.12);
  box-shadow: var(--shadow-glow);
}
.btn-ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.6);
}
.btn-ghost:hover {
  color: rgba(255, 255, 255, 0.9);
  border-color: rgba(255, 255, 255, 0.3);
}
.btn-white {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-title);
}
.btn-white:hover {
  background: rgba(255, 255, 255, 0.12);
}
.tag {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 14px;
  border-radius: var(--radius-tag);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-body);
  font-size: 12px;
  letter-spacing: 0.4px;
}
.tag-accent {
  background: rgba(0, 212, 255, 0.12);
  color: var(--accent);
}
.tag-orange {
  background: rgba(255, 138, 0, 0.1);
  color: var(--orange);
}
.tag-green {
  background: rgba(52, 211, 153, 0.12);
  color: var(--success);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 64px;
  background: rgba(5, 7, 13, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 212, 255, 0.15);
}
.header-inner {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #05070D;
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.3);
}
.logo-icon svg {
  width: 20px;
  height: 20px;
}
.logo-text {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-title);
  letter-spacing: 1px;
  line-height: 1.1;
}
.logo-sub {
  display: block;
  font-size: 11px;
  font-weight: 400;
  color: var(--accent);
  letter-spacing: 2px;
  line-height: 1;
  margin-top: 3px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  height: 44px;
  padding: 0 18px;
  font-size: 15px;
  color: var(--text-body);
  letter-spacing: 0.5px;
  border-radius: 6px;
  transition: color 0.2s ease;
}
.nav-link:hover {
  color: var(--text-title);
}
.nav-link:hover::after {
  transform: scaleX(1);
  opacity: 1;
}
.nav-link.active {
  color: var(--text-title);
  font-weight: 600;
}
.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 18px;
  right: 18px;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 2px;
  box-shadow: var(--shadow-glow);
  transform: scaleX(1);
  opacity: 1;
}
.nav-link::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 18px;
  right: 18px;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 2px;
  opacity: 0;
  transform: scaleX(0.6);
  transition: all 0.25s ease;
}
.nav-cta {
  flex-shrink: 0;
}
.nav-cta .btn {
  height: 40px;
  padding: 0 20px;
  font-size: 14px;
  border-radius: 8px;
}
.hamburger {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  align-items: center;
  justify-content: center;
  color: var(--text-title);
  font-size: 20px;
}
.hamburger:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: #070B14;
  border-bottom: 1px solid rgba(0, 212, 255, 0.2);
  padding: 16px 20px 24px;
  z-index: 999;
  transform: translateY(-8px);
  opacity: 0;
  transition: all 0.25s ease;
  pointer-events: none;
}
.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}
.mobile-menu a {
  display: block;
  height: 48px;
  line-height: 48px;
  font-size: 18px;
  color: var(--text-body);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.mobile-menu a:last-child {
  border-bottom: none;
}
.mobile-menu a:hover,
.mobile-menu a.active {
  color: var(--accent);
}

/* Hero */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding-top: 64px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  z-index: 0;
}
.hero-bg::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(100deg, rgba(5, 7, 13, 0.92) 0%, rgba(5, 7, 13, 0.75) 45%, rgba(5, 7, 13, 0.4) 100%);
}
.hero-grid-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: linear-gradient(rgba(0, 212, 255, 0.08) 1px, transparent 1px), linear-gradient(90deg, rgba(0, 212, 255, 0.08) 1px, transparent 1px);
  background-size: 44px 44px;
  z-index: 1;
  opacity: 0.5;
  mask-image: radial-gradient(ellipse at center left, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center left, black 30%, transparent 75%);
}
.hero-inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 40px;
  padding-top: 40px;
  padding-bottom: 40px;
}
.hero-content {
  max-width: 640px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 16px;
  border-radius: var(--radius-tag);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 1px;
  margin-bottom: 24px;
}
.hero-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.8);
}
.hero-title {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-title);
  letter-spacing: 0.5px;
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}
.hero-title .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-body);
  max-width: 560px;
  margin-bottom: 32px;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 32px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--text-body);
}
.hero-meta span::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 6px rgba(0, 245, 160, 0.6);
}
.hero-visual {
  flex-shrink: 0;
  width: 440px;
  height: 460px;
  border-radius: var(--radius-hero);
  overflow: hidden;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(5, 7, 13, 0.7) 100%);
}
.hero-visual-tag {
  position: absolute;
  bottom: 20px;
  left: 20px;
  right: 20px;
  z-index: 2;
}
.hero-visual-tag .tag {
  background: rgba(5, 7, 13, 0.6);
  color: var(--text-title);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

/* Services */
.services {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.services-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.service-card {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  padding: 32px;
  transition: all 0.3s ease;
  overflow: hidden;
}
.service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.service-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 212, 255, 0.08);
  transform: translateY(-2px);
}
.service-card:hover::before {
  opacity: 1;
}
.service-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent);
  margin-bottom: 20px;
  transition: transform 0.3s ease;
}
.service-card:hover .service-icon {
  transform: translateY(-2px);
}
.service-icon svg {
  width: 24px;
  height: 24px;
  stroke-width: 2;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.service-num {
  position: absolute;
  top: 28px;
  right: 28px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.15);
  font-weight: 700;
  letter-spacing: 1px;
}
.service-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 10px;
}
.service-card p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
}

/* Stats */
.stats-area {
  background: var(--bg-primary);
}
.stats-bar {
  display: flex;
  align-items: stretch;
  background: var(--bg-deep);
  border-radius: var(--radius-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 40px 24px;
}
.stat-item {
  flex: 1;
  text-align: center;
  padding: 12px 16px;
  position: relative;
}
.stat-item + .stat-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 64px;
  background: rgba(255, 255, 255, 0.08);
}
.stat-num {
  font-size: 52px;
  font-weight: 800;
  line-height: 1.1;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
  letter-spacing: -1px;
}
.stat-label {
  font-size: 13px;
  color: var(--text-weak);
  letter-spacing: 0.5px;
}

/* Cases */
.cases {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.cases-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 40px;
  gap: 24px;
}
.cases-more {
  font-size: 14px;
  color: var(--text-body);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.cases-more:hover {
  color: var(--accent);
}
.cases-more i {
  transition: transform 0.2s ease;
}
.cases-more:hover i {
  transform: translateX(4px);
}
.cases-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.case-card {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  display: block;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: all 0.3s ease;
}
.case-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-card), 0 0 30px rgba(0, 212, 255, 0.06);
  transform: translateY(-2px);
}
.case-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.case-card:hover img {
  transform: scale(1.03);
}
.case-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 20%, rgba(5, 7, 13, 0.9) 100%);
  z-index: 1;
}
.case-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 24px;
  z-index: 2;
}
.case-info .tag {
  margin-bottom: 10px;
  background: rgba(5, 7, 13, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-title);
}
.case-info h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 6px;
}
.case-info p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.5;
}

/* Plan */
.plan-panel {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-hero);
  padding: 48px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.plan-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20%;
  right: 20%;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 2px;
  box-shadow: var(--shadow-glow);
}
.plan-left h2 {
  font-size: 30px;
  font-weight: 700;
  color: var(--text-title);
  line-height: 1.3;
  margin-bottom: 16px;
}
.plan-left p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-body);
  margin-bottom: 28px;
}
.plan-right {
  background: rgba(5, 7, 13, 0.35);
  border-radius: var(--radius-card);
  padding: 32px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}
.plan-right ul li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.6;
}
.plan-right ul li::before {
  content: "";
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.15);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  margin-top: 4px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%2300D4FF' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='3 8 6.5 11.5 13 4.5'/%3E%3C/svg%3E");
  background-size: 10px;
  background-position: center;
  background-repeat: no-repeat;
}

/* News */
.news {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.news-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 36px;
  gap: 24px;
}
.news-more {
  font-size: 14px;
  color: var(--text-body);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.news-more:hover {
  color: var(--accent);
}
.news-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.news-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-card);
  padding: 24px 28px;
  transition: all 0.25s ease;
}
.news-item:hover {
  border-color: rgba(0, 212, 255, 0.25);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  transform: translateX(4px);
}
.news-top {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-weak);
}
.news-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-title);
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.news-title:hover {
  color: var(--accent);
}
.news-summary {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-empty {
  text-align: center;
  padding: 60px 24px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-card);
  color: var(--text-weak);
  font-size: 15px;
}

/* FAQ */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}
.faq-item {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  margin-bottom: 14px;
  overflow: hidden;
  transition: all 0.3s ease;
}
.faq-item.active {
  border-color: rgba(0, 212, 255, 0.3);
  background: rgba(0, 212, 255, 0.05);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}
.faq-question {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  min-height: 56px;
  padding: 14px 24px;
  text-align: left;
  color: var(--text-title);
  font-size: 17px;
  font-weight: 500;
  cursor: pointer;
  position: relative;
}
.faq-question .faq-q-num {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(0, 212, 255, 0.08);
}
.faq-question .faq-arrow {
  margin-left: auto;
  color: var(--text-weak);
  font-size: 16px;
  transition: transform 0.2s ease;
  flex-shrink: 0;
}
.faq-item.active .faq-arrow {
  transform: rotate(180deg);
}
.faq-item.active .faq-question {
  box-shadow: inset 3px 0 0 0 var(--accent);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.faq-item.active .faq-answer {
  max-height: 400px;
}
.faq-answer-inner {
  padding: 0 24px 20px 72px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-weak);
}

/* Contact */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  background: var(--bg-deep);
  border-radius: var(--radius-hero);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 48px;
}
.contact-info h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 16px;
}
.contact-info > p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-body);
  margin-bottom: 32px;
}
.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.contact-info-item:last-child {
  border-bottom: none;
}
.contact-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(0, 212, 255, 0.08);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-icon svg {
  width: 18px;
  height: 18px;
  stroke-width: 2;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.contact-info-item h4 {
  font-size: 15px;
  color: var(--text-title);
  margin-bottom: 2px;
}
.contact-info-item p {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
}
.contact-form {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-card);
  padding: 32px;
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 8px;
}
.form-group input,
.form-group textarea {
  width: 100%;
  height: 46px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-btn);
  padding: 0 16px;
  color: var(--text-title);
  font-size: 15px;
  transition: all 0.2s ease;
}
.form-group textarea {
  height: 120px;
  padding-top: 14px;
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.15);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-weak);
}
.form-submit .btn {
  width: 100%;
}

/* Footer */
.footer {
  background: #04060C;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 56px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand .logo {
  margin-bottom: 16px;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.5);
  max-width: 280px;
}
.footer-col h4 {
  font-size: 16px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 18px;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.55);
  transition: all 0.2s ease;
}
.footer-col ul li a:hover {
  color: var(--accent);
  padding-left: 4px;
}
.footer-col ul li span {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.6;
}
.footer-divider {
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin: 0;
}
.footer-copy {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
  gap: 16px;
}
.footer-copy a {
  color: rgba(255, 255, 255, 0.4);
}
.footer-copy a:hover {
  color: var(--accent);
}

/* Responsive */
@media (max-width: 1024px) {
  .hero-visual {
    width: 340px;
    height: 380px;
  }
  .plan-panel {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 768px) {
  .container {
    padding-left: var(--p-mobile);
    padding-right: var(--p-mobile);
  }
  .section {
    padding-top: var(--space-section-mobile);
    padding-bottom: var(--space-section-mobile);
  }
  .section-title {
    font-size: 24px;
  }
  .nav-links {
    display: none;
  }
  .nav-cta {
    display: none;
  }
  .hamburger {
    display: flex;
  }
  .mobile-menu.show {
    display: block;
  }
  .hero-title {
    font-size: 28px;
    line-height: 1.3;
  }
  .hero-subtitle {
    font-size: 15px;
  }
  .hero-visual {
    display: none;
  }
  .hero-inner {
    padding-top: 24px;
    padding-bottom: 24px;
  }
  .hero {
    min-height: calc(92vh - 64px);
  }
  .services-grid {
    grid-template-columns: 1fr;
  }
  .stats-bar {
    flex-direction: column;
    gap: 24px;
    padding: 32px 24px;
  }
  .stat-item + .stat-item::before {
    left: 50%;
    top: -12px;
    transform: translateX(-50%);
    width: 48px;
    height: 1px;
  }
  .stat-num {
    font-size: 40px;
  }
  .cases-grid {
    grid-template-columns: 1fr;
  }
  .case-info h3 {
    font-size: 18px;
  }
  .plan-panel {
    padding: 32px 20px;
  }
  .plan-left h2 {
    font-size: 22px;
  }
  .contact-wrap {
    grid-template-columns: 1fr;
    padding: 32px 20px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-copy {
    flex-direction: column;
    text-align: center;
  }
  .news-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .cases-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .btn {
    height: 44px;
    padding: 0 22px;
    font-size: 14px;
  }
  .faq-answer-inner {
    padding-left: 20px;
  }
}
@media (max-width: 520px) {
  .hero-title {
    font-size: 26px;
  }
  .hero-badge {
    font-size: 12px;
  }
  .plan-panel {
    padding: 24px 16px;
  }
  .plan-right {
    padding: 24px 16px;
  }
  .contact-form {
    padding: 24px 16px;
  }
  .service-card {
    padding: 24px 20px;
  }
  .case-info {
    padding: 16px;
  }
  .news-item {
    padding: 20px;
  }
}

/* roulang page: category1 */
:root {
  --bg-deep: #05070D;
  --bg-base: #0A101D;
  --bg-panel: #0F172A;
  --panel-glass: rgba(255,255,255,0.04);
  --stroke-glass: rgba(255,255,255,0.08);
  --primary: #00D4FF;
  --primary-grad-start: #00D4FF;
  --primary-grad-end: #00F5A0;
  --accent: #FF8A00;
  --accent-hover: #FF9E33;
  --text-title: #F5F8FF;
  --text-body: #A8B3CC;
  --text-muted: #6C7A96;
  --success: #34D399;
  --warning: #F87171;
  --info: #60A5FA;
  --radius-btn: 10px;
  --radius-card: 16px;
  --radius-hero: 24px;
  --radius-pill: 999px;
  --shadow-card: 0 8px 24px rgba(0,0,0,0.4);
  --shadow-glow-primary: 0 0 20px rgba(0,212,255,0.35);
  --shadow-glow-accent: 0 0 24px rgba(255,138,0,0.25);
  --font-sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --container-max: 1200px;
  --space-section: 72px;
}
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--text-body);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: var(--primary);
  text-decoration: none;
  transition: color .25s ease;
}
a:focus-visible,
button:focus-visible {
  outline: 2px solid #00D4FF;
  outline-offset: 2px;
}
ul {
  list-style: none;
}
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}
/* ===== Header / Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 64px;
  background: rgba(5,7,13,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,212,255,0.25);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-title);
  min-width: 0;
}
.logo-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-grad-start), var(--primary-grad-end));
  border-radius: 10px;
  color: #05070D;
  flex-shrink: 0;
}
.logo-icon svg {
  width: 18px;
  height: 18px;
}
.logo-text {
  display: block;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-title);
  line-height: 1.2;
  letter-spacing: 0.5px;
}
.logo-sub {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.2;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-link {
  position: relative;
  font-size: 15px;
  color: var(--text-body);
  white-space: nowrap;
  padding: 8px 2px;
  transition: color .25s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-grad-start), var(--primary-grad-end));
  border-radius: 2px;
  opacity: 0;
  transform: scaleX(0);
  transition: opacity .25s ease, transform .25s ease;
}
.nav-link:hover {
  color: var(--text-title);
}
.nav-link:hover::after {
  opacity: 1;
  transform: scaleX(1);
}
.nav-link.active {
  color: var(--text-title);
  font-weight: 600;
}
.nav-link.active::after {
  opacity: 1;
  transform: scaleX(1);
  box-shadow: 0 0 8px rgba(0,212,255,0.6);
}
.nav-cta {
  flex-shrink: 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-btn);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  padding: 0 24px;
  height: 44px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .25s ease;
  white-space: nowrap;
}
.btn-orange {
  background: var(--accent);
  color: #05070D;
  border-color: var(--accent);
  box-shadow: 0 4px 16px rgba(255,138,0,0.25);
}
.btn-orange:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow-accent);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover {
  background: rgba(0,212,255,0.12);
  box-shadow: var(--shadow-glow-primary);
}
.btn-ghost {
  background: transparent;
  color: rgba(255,255,255,0.6);
  border-color: rgba(255,255,255,0.15);
}
.btn-ghost:hover {
  color: rgba(255,255,255,0.9);
  border-color: rgba(255,255,255,0.35);
}
.btn-lg {
  height: 52px;
  padding: 0 36px;
  font-size: 16px;
}
.hamburger {
  display: none;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-btn);
  color: var(--text-title);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color .25s ease, background .25s ease;
}
.hamburger:hover {
  border-color: var(--primary);
  background: rgba(0,212,255,0.08);
}
/* ===== Mobile drawer ===== */
.mobile-menu {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: #070B14;
  border-bottom: 1px solid rgba(0,212,255,0.2);
  padding: 16px 24px 24px;
  z-index: 99;
  display: none;
  flex-direction: column;
  gap: 8px;
}
.mobile-menu.open {
  display: flex;
}
.mobile-menu a {
  font-size: 18px;
  color: var(--text-body);
  padding: 14px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: color .25s ease, padding-left .25s ease;
}
.mobile-menu a:hover,
.mobile-menu a.active {
  color: var(--primary);
  padding-left: 8px;
}
.mobile-menu .btn {
  margin-top: 16px;
}
/* ===== Hero ===== */
.page-hero {
  position: relative;
  padding: 150px 0 80px;
  background:
    linear-gradient(120deg, rgba(0,212,255,0.12), transparent 40%),
    linear-gradient(180deg, rgba(5,7,13,0.75), rgba(5,7,13,0.92)),
    url("/assets/images/backpic/back-1.png") center/cover no-repeat;
  border-bottom: 1px solid rgba(0,212,255,0.18);
  overflow: hidden;
}
.page-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 40%;
  height: 100%;
  background: linear-gradient(120deg, transparent, rgba(0,212,255,0.06));
  pointer-events: none;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.breadcrumb a {
  color: var(--text-muted);
  transition: color .25s ease;
}
.breadcrumb a:hover {
  color: var(--primary);
}
.breadcrumb .sep {
  color: rgba(255,255,255,0.25);
}
.page-hero h1 {
  font-size: 44px;
  line-height: 1.25;
  color: var(--text-title);
  font-weight: 700;
  max-width: 760px;
  margin-bottom: 20px;
}
.page-hero h1 .highlight {
  background: linear-gradient(90deg, var(--primary-grad-start), var(--primary-grad-end));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.page-hero .hero-desc {
  font-size: 18px;
  color: var(--text-body);
  max-width: 640px;
  margin-bottom: 32px;
}
.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.75);
  font-size: 13px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
}
.badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
}
/* ===== Section shared ===== */
.section {
  padding: var(--space-section) 0;
}
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 48px;
}
.section-head h2 {
  font-size: 34px;
  line-height: 1.3;
  color: var(--text-title);
  font-weight: 700;
}
.section-head .section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 480px;
}
.section-tag {
  display: inline-flex;
  align-items: center;
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.2);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 14px;
  letter-spacing: 1px;
}
/* ===== Feature cards ===== */
.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.feature-card {
  position: relative;
  background: var(--panel-glass);
  border: 1px solid var(--stroke-glass);
  border-radius: var(--radius-card);
  padding: 32px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-grad-start), var(--primary-grad-end));
  opacity: 0;
  transition: opacity .3s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0,212,255,0.4);
  box-shadow: 0 12px 32px rgba(0,0,0,0.5), 0 0 20px rgba(0,212,255,0.15);
}
.feature-card:hover::before {
  opacity: 1;
}
.feature-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: rgba(0,212,255,0.1);
  color: var(--primary);
  border: 1px solid rgba(0,212,255,0.2);
  transition: transform .3s ease;
}
.feature-card:hover .feature-icon {
  transform: translateY(-2px);
}
.feature-icon svg {
  width: 22px;
  height: 22px;
}
.feature-num {
  font-size: 32px;
  font-weight: 700;
  background: linear-gradient(90deg, var(--primary-grad-start), var(--primary-grad-end));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0.7;
}
.feature-card h3 {
  font-size: 20px;
  color: var(--text-title);
  margin-bottom: 12px;
  font-weight: 600;
}
.feature-card p {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.7;
}
/* ===== Cover section ===== */
.cover-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.cover-card {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--bg-panel);
  border: 1px solid var(--stroke-glass);
  min-height: 280px;
  display: flex;
  align-items: flex-end;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.cover-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: rgba(0,212,255,0.35);
}
.cover-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}
.cover-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5,7,13,0.15), rgba(5,7,13,0.88));
  z-index: 2;
  transition: background .3s ease;
}
.cover-card:hover::after {
  background: linear-gradient(180deg, rgba(5,7,13,0.1), rgba(5,7,13,0.85));
}
.cover-body {
  position: relative;
  z-index: 3;
  padding: 28px;
  width: 100%;
}
.cover-body .badge {
  background: rgba(0,212,255,0.15);
  border-color: rgba(0,212,255,0.3);
  color: var(--primary);
  margin-bottom: 12px;
}
.cover-body h3 {
  font-size: 22px;
  color: var(--text-title);
  margin-bottom: 8px;
  font-weight: 600;
}
.cover-body p {
  font-size: 14px;
  color: rgba(255,255,255,0.65);
  line-height: 1.6;
}
/* ===== Process timeline ===== */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}
.process-item {
  position: relative;
  text-align: center;
  padding: 32px 20px;
  background: var(--panel-glass);
  border: 1px solid var(--stroke-glass);
  border-radius: var(--radius-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.process-item:hover {
  transform: translateY(-4px);
  border-color: rgba(0,212,255,0.3);
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.process-step {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.2);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  margin: 0 auto 16px;
}
.process-item h3 {
  font-size: 18px;
  color: var(--text-title);
  margin-bottom: 10px;
  font-weight: 600;
}
.process-item p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}
/* ===== Split feature ===== */
.split-panel {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  background: var(--panel-glass);
  border: 1px solid var(--stroke-glass);
  border-radius: var(--radius-hero);
  padding: 48px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  align-items: center;
}
.split-image {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  min-height: 320px;
  border: 1px solid rgba(255,255,255,0.08);
}
.split-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
}
.split-content h3 {
  font-size: 26px;
  color: var(--text-title);
  font-weight: 700;
  margin-bottom: 16px;
}
.split-content > p {
  font-size: 16px;
  color: var(--text-body);
  margin-bottom: 24px;
}
.check-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 15px;
  color: var(--text-body);
}
.check-list .check-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
  background: linear-gradient(135deg, var(--primary-grad-start), var(--primary-grad-end));
  border-radius: 50%;
  color: #05070D;
}
.check-list .check-icon svg {
  width: 12px;
  height: 12px;
}
/* ===== FAQ ===== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}
.faq-item {
  border: 1px solid var(--stroke-glass);
  border-radius: var(--radius-card);
  background: rgba(255,255,255,0.02);
  margin-bottom: 14px;
  transition: background .3s ease, border-color .3s ease;
  overflow: hidden;
}
.faq-item.active {
  background: rgba(0,212,255,0.05);
  border-color: rgba(0,212,255,0.25);
  border-left: 3px solid var(--primary);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 16px 20px;
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  text-align: left;
  color: rgba(255,255,255,0.9);
  font-size: 17px;
  line-height: 1.4;
  gap: 16px;
}
.faq-q {
  font-weight: 700;
  color: var(--primary);
  margin-right: 10px;
  font-size: 18px;
}
.faq-arrow {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 50%;
  color: var(--text-muted);
  transition: transform .2s ease, color .2s ease, border-color .2s ease;
}
.faq-item.active .faq-arrow {
  transform: rotate(180deg);
  color: var(--primary);
  border-color: var(--primary);
}
.faq-arrow svg {
  width: 14px;
  height: 14px;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px 24px;
  font-size: 15px;
  color: rgba(255,255,255,0.55);
  line-height: 1.75;
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 16px;
  margin: 0 0 0 20px;
}
/* ===== CTA ===== */
.cta-section {
  padding: 72px 0;
}
.cta-panel {
  position: relative;
  background:
    linear-gradient(120deg, rgba(0,212,255,0.15), transparent 50%),
    rgba(15,23,42,0.8);
  border: 1px solid rgba(0,212,255,0.25);
  border-radius: var(--radius-hero);
  padding: 56px;
  text-align: center;
  overflow: hidden;
}
.cta-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-grad-start), var(--primary-grad-end));
}
.cta-panel h2 {
  font-size: 32px;
  color: var(--text-title);
  font-weight: 700;
  margin-bottom: 16px;
}
.cta-panel p {
  font-size: 16px;
  color: var(--text-body);
  max-width: 600px;
  margin: 0 auto 32px;
}
.cta-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
/* ===== Footer ===== */
.footer {
  background: #04060C;
  border-top: 1px solid rgba(0,212,255,0.12);
  padding-top: 56px;
  padding-bottom: 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.9fr 0.9fr;
  gap: 32px;
  margin-bottom: 40px;
}
.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 16px;
  line-height: 1.7;
  max-width: 320px;
}
.footer-col h4 {
  font-size: 16px;
  color: rgba(255,255,255,0.9);
  text-align: left;
  margin-bottom: 16px;
  font-weight: 600;
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-col a,
.footer-col span {
  font-size: 14px;
  color: rgba(255,255,255,0.55);
  transition: color .25s ease, padding-left .25s ease;
  display: inline-block;
}
.footer-col a:hover {
  color: var(--primary);
  padding-left: 4px;
}
.footer-divider {
  border: none;
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 20px;
}
.footer-copy {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  color: rgba(255,255,255,0.4);
  gap: 16px;
  flex-wrap: wrap;
}
/* ===== Responsive ===== */
@media (max-width: 1279px) {
  .process-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 1023px) {
  .nav-links {
    gap: 16px;
  }
  .nav-link {
    font-size: 14px;
  }
  .split-panel {
    grid-template-columns: 1fr;
    padding: 32px;
  }
  .split-image {
    min-height: 260px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 767px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .nav-links {
    display: none;
  }
  .nav-cta {
    display: none;
  }
  .hamburger {
    display: flex;
  }
  .page-hero {
    padding: 120px 0 56px;
  }
  .page-hero h1 {
    font-size: 28px;
  }
  .page-hero .hero-desc {
    font-size: 15px;
  }
  .section {
    padding: 48px 0;
  }
  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 32px;
  }
  .section-head h2 {
    font-size: 24px;
  }
  .features-grid,
  .cover-grid,
  .process-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .feature-card {
    padding: 24px;
  }
  .cover-card {
    min-height: 240px;
  }
  .process-grid {
    gap: 16px;
  }
  .cta-panel {
    padding: 36px 24px;
  }
  .cta-panel h2 {
    font-size: 24px;
  }
  .btn-lg {
    height: 48px;
    padding: 0 28px;
    font-size: 15px;
  }
  .footer-copy {
    flex-direction: column;
    text-align: center;
  }
}

/* roulang page: article */
:root {
  --bg-page: #05070D;
  --bg-deep: #0A101D;
  --bg-panel: #0F172A;
  --primary: #00D4FF;
  --primary-grad: linear-gradient(135deg, #00D4FF, #00F5A0);
  --accent: #FF8A00;
  --accent-hover: #FF9E33;
  --text-title: #F5F8FF;
  --text-body: #A8B3CC;
  --text-mute: #6C7A96;
  --border-glass: rgba(255,255,255,0.08);
  --bg-glass: rgba(255,255,255,0.04);
  --radius-btn: 10px;
  --radius-card: 16px;
  --radius-panel: 24px;
  --radius-tag: 999px;
  --shadow-card: 0 8px 24px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 20px rgba(0,212,255,0.35);
  --shadow-orange: 0 0 24px rgba(255,138,0,0.25);
  --container-max: 1200px;
  --font: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font);
  background: var(--bg-page);
  color: var(--text-body);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  background-image:
    linear-gradient(120deg, rgba(0,212,255,0.04) 0%, transparent 40%),
    radial-gradient(rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 100% 100%, 24px 24px;
}
a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover {
  color: #fff;
}
img {
  max-width: 100%;
  display: block;
  border: 0;
}
button, input, textarea {
  font-family: inherit;
  font-size: inherit;
}
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}
/* ===== Header / Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 64px;
  background: rgba(5,7,13,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,212,255,0.25);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--text-title);
}
.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--primary-grad);
  color: #05070D;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(0,212,255,0.35);
}
.logo-icon svg {
  width: 20px;
  height: 20px;
}
.logo-text {
  display: block;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.5px;
  color: #F5F8FF;
}
.logo-sub {
  display: block;
  font-size: 11px;
  line-height: 1.2;
  color: var(--primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-top: 2px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}
.nav-link {
  position: relative;
  font-size: 15px;
  color: var(--text-body);
  letter-spacing: 0.5px;
  padding: 8px 0;
  line-height: 1.4;
  transition: color 0.2s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--primary-grad);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
  box-shadow: 0 0 10px rgba(0,212,255,0.5);
}
.nav-link:hover {
  color: #fff;
}
.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}
.nav-link.active {
  color: #fff;
}
.nav-cta {
  margin-left: 8px;
  flex-shrink: 0;
}
.hamburger {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-glass);
  border-radius: 10px;
  background: rgba(255,255,255,0.05);
  color: var(--text-title);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.2s;
}
.hamburger:hover {
  background: rgba(0,212,255,0.1);
}
/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.25s ease;
  text-align: center;
  line-height: 1.2;
}
.btn-orange {
  background: var(--accent);
  color: #0A101D;
  border-color: var(--accent);
  box-shadow: 0 4px 14px rgba(255,138,0,0.25);
}
.btn-orange:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #0A101D;
  transform: translateY(-1px);
  box-shadow: var(--shadow-orange);
}
.btn-outline {
  background: transparent;
  border-color: rgba(0,212,255,0.6);
  color: var(--primary);
}
.btn-outline:hover {
  background: rgba(0,212,255,0.12);
  border-color: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-glow);
}
.btn-ghost {
  background: transparent;
  border-color: rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.6);
}
.btn-ghost:hover {
  color: rgba(255,255,255,0.9);
  border-color: rgba(255,255,255,0.3);
}
/* ===== Breadcrumb ===== */
.breadcrumb-section {
  padding: 100px 0 20px;
  position: relative;
}
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 14px;
  color: var(--text-mute);
}
.breadcrumb a {
  color: var(--text-mute);
  transition: color 0.2s;
}
.breadcrumb a:hover {
  color: var(--primary);
}
.breadcrumb-sep {
  color: rgba(255,255,255,0.2);
}
.breadcrumb-current {
  color: var(--text-body);
  max-width: 480px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
/* ===== Article Main ===== */
.article-main {
  padding: 24px 0 60px;
}
.article-card {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
  background: linear-gradient(135deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-panel);
  padding: 48px 56px 56px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  overflow: hidden;
}
.article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-grad);
  opacity: 0.8;
}
.article-kicker {
  display: inline-block;
  font-size: 13px;
  color: var(--primary);
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.2);
  padding: 4px 14px;
  border-radius: var(--radius-tag);
  letter-spacing: 0.5px;
  margin-bottom: 18px;
}
.article-header h1 {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-title);
  letter-spacing: 0.2px;
  margin-bottom: 18px;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--text-mute);
}
.meta-item svg {
  width: 14px;
  height: 14px;
  color: var(--primary);
}
/* ===== Article Content ===== */
.article-content {
  padding: 36px 0 16px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-body);
}
.article-content p {
  margin-bottom: 24px;
}
.article-content h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-title);
  margin: 40px 0 20px;
  padding-left: 16px;
  border-left: 3px solid var(--primary);
  line-height: 1.35;
}
.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-title);
  margin: 32px 0 16px;
  line-height: 1.4;
}
.article-content ul,
.article-content ol {
  margin: 0 0 24px;
  padding-left: 24px;
}
.article-content li {
  margin-bottom: 8px;
}
.article-content ul li::marker {
  color: var(--primary);
}
.article-content ol li::marker {
  color: var(--primary);
  font-weight: 600;
}
.article-content blockquote {
  background: rgba(0,212,255,0.04);
  border-left: 3px solid var(--primary);
  border-radius: 0 12px 12px 0;
  padding: 18px 24px;
  margin: 0 0 24px;
  color: var(--text-body);
  font-style: normal;
}
.article-content blockquote p {
  margin-bottom: 0;
}
.article-content img {
  border-radius: 12px;
  border: 1px solid var(--border-glass);
  margin: 24px 0;
  box-shadow: var(--shadow-card);
}
.article-content a {
  color: var(--primary);
  border-bottom: 1px solid rgba(0,212,255,0.3);
  transition: color 0.2s, border-color 0.2s;
}
.article-content a:hover {
  color: #fff;
  border-bottom-color: #fff;
}
.article-content table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
  color: var(--text-body);
}
.article-content table th,
.article-content table td {
  border: 1px solid rgba(255,255,255,0.1);
  padding: 10px 14px;
  text-align: left;
  white-space: nowrap;
}
.article-content table th {
  background: rgba(0,212,255,0.06);
  color: var(--text-title);
  font-weight: 600;
}
.article-content pre {
  background: var(--bg-panel);
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  padding: 20px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.7;
  color: #D6E2F5;
  margin-bottom: 24px;
}
.article-content code {
  background: rgba(0,212,255,0.1);
  color: var(--primary);
  font-size: 14px;
  padding: 2px 6px;
  border-radius: 6px;
}
.article-content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}
/* ===== Article Footer ===== */
.article-footer {
  padding-top: 32px;
  margin-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}
.tag {
  display: inline-flex;
  align-items: center;
  font-size: 12px;
  color: var(--text-body);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-tag);
  padding: 6px 16px;
  transition: all 0.2s;
}
.tag:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: rgba(0,212,255,0.08);
}
.article-prev-next {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.pn-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-body);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px;
  padding: 10px 18px;
  transition: all 0.25s;
}
.pn-link:hover {
  color: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 0 14px rgba(0,212,255,0.15);
}
/* ===== No Article ===== */
.no-article {
  text-align: center;
  padding: 80px 40px;
}
.no-article h1 {
  font-size: 30px;
  color: var(--text-title);
  margin-bottom: 16px;
}
.no-article p {
  font-size: 16px;
  color: var(--text-mute);
  margin-bottom: 32px;
}
/* ===== Related ===== */
.related-section {
  padding: 16px 0 60px;
}
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}
.section-head h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-title);
  position: relative;
  padding-left: 16px;
}
.section-head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 24px;
  border-radius: 4px;
  background: var(--primary-grad);
  box-shadow: 0 0 12px rgba(0,212,255,0.4);
}
.more-link {
  font-size: 14px;
  color: var(--text-mute);
  transition: all 0.25s;
}
.more-link:hover {
  color: var(--primary);
  transform: translateX(4px);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.related-card {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  transition: all 0.3s ease;
  display: block;
}
.related-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}
.related-img {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}
.related-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.related-card:hover .related-img img {
  transform: scale(1.05);
}
.related-info {
  padding: 20px 22px 22px;
}
.related-info h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-title);
  margin-bottom: 8px;
  line-height: 1.4;
  transition: color 0.2s;
}
.related-card:hover .related-info h3 {
  color: var(--primary);
}
.related-time {
  font-size: 13px;
  color: var(--text-mute);
}
/* ===== Page CTA ===== */
.page-cta {
  padding: 20px 0 80px;
}
.cta-box {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  background: linear-gradient(135deg, rgba(0,212,255,0.08), rgba(0,245,160,0.04));
  border: 1px solid rgba(0,212,255,0.25);
  border-radius: var(--radius-panel);
  padding: 40px 48px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.cta-content h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 8px;
}
.cta-content p {
  font-size: 15px;
  color: var(--text-mute);
  margin: 0;
}
.cta-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
/* ===== Footer ===== */
.footer {
  background: #04060C;
  border-top: 1px solid rgba(0,212,255,0.15);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
}
.footer-brand .logo {
  margin-bottom: 16px;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-mute);
  max-width: 340px;
}
.footer-col h4 {
  font-size: 16px;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  margin-bottom: 18px;
}
.footer-col ul {
  list-style: none;
  padding: 0;
}
.footer-col li {
  margin-bottom: 12px;
}
.footer-col a,
.footer-col span {
  font-size: 14px;
  color: rgba(255,255,255,0.55);
  transition: all 0.25s;
  display: inline-block;
}
.footer-col a:hover {
  color: var(--primary);
  transform: translateX(4px);
}
.footer-divider {
  border: 0;
  border-top: 1px solid rgba(255,255,255,0.08);
  margin: 0;
}
.footer-copy {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}
/* ===== Focus / Accessibility ===== */
a:focus-visible,
button:focus-visible {
  outline: 2px solid #00D4FF;
  outline-offset: 2px;
}
/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}
@media (max-width: 767px) {
  .container {
    padding: 0 16px;
  }
  .header-inner {
    gap: 12px;
  }
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: #070B14;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 16px 24px 24px;
    transform: translateY(-130%);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 30px rgba(0,0,0,0.5);
    border-bottom: 2px solid var(--primary);
    z-index: 999;
    margin: 0;
  }
  .nav-links.open {
    transform: translateY(0);
  }
  .nav-links .nav-link {
    display: block;
    width: 100%;
    font-size: 18px;
    line-height: 48px;
    padding: 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .nav-links .nav-link::after {
    display: none;
  }
  .nav-cta {
    display: none;
  }
  .hamburger {
    display: inline-flex;
  }
  .breadcrumb-section {
    padding: 88px 0 12px;
  }
  .article-card {
    padding: 28px 22px 36px;
    border-radius: 18px;
  }
  .article-header h1 {
    font-size: 26px;
  }
  .article-meta {
    gap: 12px;
    padding-bottom: 20px;
  }
  .meta-item {
    font-size: 13px;
  }
  .article-content {
    font-size: 15px;
  }
  .article-content h2 {
    font-size: 22px;
  }
  .article-content h3 {
    font-size: 18px;
  }
  .cta-box {
    padding: 28px 22px;
    text-align: center;
    justify-content: center;
  }
  .cta-actions {
    justify-content: center;
    width: 100%;
  }
  .cta-actions .btn {
    flex: 1 1 100%;
  }
  .related-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-copy {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  .section-head h2 {
    font-size: 22px;
  }
  .article-prev-next {
    flex-direction: column;
  }
  .pn-link {
    width: 100%;
    justify-content: center;
  }
}
@media (max-width: 520px) {
  .logo-text {
    font-size: 16px;
  }
  .logo-sub {
    font-size: 10px;
  }
  .logo-icon {
    width: 32px;
    height: 32px;
  }
  .article-card {
    padding: 24px 16px 30px;
  }
  .breadcrumb-current {
    max-width: 220px;
  }
}

/* roulang page: category2 */
:root {
  --bg-page: #05070D;
  --bg-deep: #0A101D;
  --bg-panel: #0F172A;
  --bg-glass: rgba(255,255,255,0.04);
  --border-glass: rgba(255,255,255,0.08);
  --primary: #00D4FF;
  --primary-2: #00F5A0;
  --accent: #FF8A00;
  --accent-hover: #FF9E33;
  --text-title: #F5F8FF;
  --text-body: #A8B3CC;
  --text-muted: #6C7A96;
  --text-weak: rgba(255,255,255,0.55);
  --success: #34D399;
  --warning: #F87171;
  --radius-btn: 10px;
  --radius-card: 16px;
  --radius-panel: 24px;
  --shadow-card: 0 8px 24px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 20px rgba(0,212,255,0.35);
  --shadow-orange: 0 0 24px rgba(255,138,0,0.25);
  --container: 1200px;
  --header-h: 64px;
  --space-section: 72px;
  --space-mobile: 48px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-page);
  background-image: linear-gradient(120deg, rgba(0,212,255,0.06), transparent 40%), linear-gradient(300deg, rgba(255,138,0,0.04), transparent 30%);
  color: var(--text-body);
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  padding-top: var(--header-h);
  -webkit-font-smoothing: antialiased;
}
body.drawer-open { overflow: hidden; }
a { color: var(--primary); text-decoration: none; transition: color 0.2s ease; }
img { max-width: 100%; display: block; }
button { font-family: inherit; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
section { scroll-margin-top: calc(var(--header-h) + 20px); }

/* ===== 导航 ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 1000;
  background: rgba(5,7,13,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,212,255,0.18);
}
.header-inner { display: flex; align-items: center; height: var(--header-h); gap: 32px; }
.logo { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-icon {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(0,212,255,0.2), rgba(0,245,160,0.12));
  border: 1px solid rgba(0,212,255,0.35);
  border-radius: 10px;
  color: var(--primary);
  box-shadow: 0 0 14px rgba(0,212,255,0.15);
}
.logo-icon svg { width: 18px; height: 18px; }
.logo-text { display: block; font-size: 18px; font-weight: 800; color: var(--text-title); line-height: 1.2; letter-spacing: 0.5px; }
.logo-sub { display: block; font-size: 11px; color: var(--primary); letter-spacing: 2px; line-height: 1.2; }
.nav-links { display: flex; align-items: center; gap: 32px; margin-left: 12px; }
.nav-link { position: relative; font-size: 15px; color: rgba(255,255,255,0.75); font-weight: 500; letter-spacing: 0.5px; padding: 6px 0; white-space: nowrap; }
.nav-link::after { content: ""; position: absolute; left: 0; bottom: -2px; width: 0; height: 2px; background: linear-gradient(90deg, var(--primary), var(--primary-2)); border-radius: 999px; transition: width 0.25s ease; }
.nav-link:hover { color: #fff; }
.nav-link:hover::after { width: 100%; }
.nav-link.active { color: #fff; }
.nav-link.active::after { width: 100%; box-shadow: 0 0 12px rgba(0,212,255,0.6); }
.nav-cta { margin-left: auto; }
.hamburger { display: none; width: 40px; height: 40px; margin-left: auto; align-items: center; justify-content: center; background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.12); border-radius: 10px; color: #fff; cursor: pointer; }
.hamburger svg { width: 20px; height: 20px; }
.mobile-drawer { display: none; position: fixed; top: var(--header-h); left: 0; right: 0; bottom: 0; z-index: 999; background: #070B14; padding: 24px 24px 40px; overflow-y: auto; flex-direction: column; gap: 8px; }
.mobile-drawer.open { animation: fadeIn 0.2s ease; }
.mobile-link { display: flex; align-items: center; min-height: 48px; font-size: 18px; color: rgba(255,255,255,0.85); border-bottom: 1px solid rgba(255,255,255,0.06); padding: 0 8px; }
.mobile-link.active { color: var(--primary); font-weight: 600; border-left: 3px solid var(--primary); padding-left: 13px; }
.mobile-drawer .btn { justify-content: center; margin-top: 20px; }

/* ===== 按钮 ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 44px; padding: 0 28px; border-radius: var(--radius-btn); font-size: 15px; font-weight: 600; letter-spacing: 0.3px; cursor: pointer; transition: all 0.25s ease; border: none; white-space: nowrap; min-height: 44px; }
.btn-outline { background: transparent; border: 1px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: rgba(0,212,255,0.12); box-shadow: 0 0 20px rgba(0,212,255,0.25); transform: translateY(-1px); color: #fff; }
.btn-orange { background: var(--accent); color: #0B0B0F; box-shadow: 0 4px 18px rgba(255,138,0,0.2); }
.btn-orange:hover { background: var(--accent-hover); box-shadow: 0 0 24px rgba(255,138,0,0.35); transform: translateY(-1px); color: #0B0B0F; }
.btn-ghost { background: transparent; border: 1px solid rgba(255,255,255,0.2); color: rgba(255,255,255,0.7); }
.btn-ghost:hover { color: #fff; border-color: rgba(255,255,255,0.45); }
.btn-lg { height: 52px; padding: 0 40px; font-size: 16px; }

/* ===== 页面 Hero ===== */
.page-hero { position: relative; display: flex; align-items: center; min-height: 340px; padding: 64px 0 48px; background-size: cover; background-position: center; background-repeat: no-repeat; overflow: hidden; }
.page-hero::before { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: linear-gradient(120deg, rgba(5,7,13,0.94) 0%, rgba(5,7,13,0.78) 55%, rgba(0,212,255,0.08) 100%); pointer-events: none; }
.page-hero::after { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, transparent, var(--primary), var(--primary-2), transparent); }
.page-hero-content { position: relative; z-index: 2; width: 100%; }
.breadcrumb { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; font-size: 13px; color: var(--text-muted); margin-bottom: 20px; }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: rgba(255,255,255,0.25); }
.breadcrumb .current { color: rgba(255,255,255,0.7); }
.page-hero-title { font-size: 42px; line-height: 1.25; font-weight: 800; color: var(--text-title); letter-spacing: 0.5px; }
.page-hero-title span { color: var(--primary); }
.page-hero-desc { margin-top: 14px; font-size: 16px; line-height: 1.8; color: rgba(255,255,255,0.8); max-width: 640px; }

/* ===== 通用 Section ===== */
.section { padding: var(--space-section) 0; }
.section-sm { padding: 48px 0; }
.section-head { margin-bottom: 40px; }
.section-tag { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--primary); letter-spacing: 2px; text-transform: uppercase; background: rgba(0,212,255,0.08); border: 1px solid rgba(0,212,255,0.2); border-radius: 999px; padding: 5px 14px; margin-bottom: 16px; }
.section-tag::before { content: ""; width: 6px; height: 6px; background: var(--primary); border-radius: 50%; box-shadow: 0 0 8px var(--primary); }
.section-title { font-size: 32px; font-weight: 800; color: var(--text-title); line-height: 1.3; letter-spacing: 0.3px; }
.section-title em { font-style: normal; background: linear-gradient(90deg, var(--primary), var(--primary-2)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.section-desc { margin-top: 12px; font-size: 15px; color: var(--text-muted); max-width: 720px; line-height: 1.8; }

/* ===== 核心优势卡片 ===== */
.grid-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.feature-card { position: relative; background: var(--bg-glass); border: 1px solid var(--border-glass); border-radius: var(--radius-card); padding: 28px 24px 24px; backdrop-filter: blur(14px); transition: all 0.28s ease; }
.feature-card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px; background: linear-gradient(90deg, transparent, rgba(0,212,255,0.4), transparent); opacity: 0; transition: opacity 0.28s ease; }
.feature-card:hover { border-color: rgba(0,212,255,0.45); box-shadow: 0 12px 32px rgba(0,0,0,0.5), 0 0 24px rgba(0,212,255,0.08); transform: translateY(-4px); }
.feature-card:hover::before { opacity: 1; }
.feature-num { position: absolute; top: 20px; right: 22px; font-size: 14px; letter-spacing: 1.5px; font-weight: 700; color: rgba(255,255,255,0.25); font-family: "DIN Alternate", "Bebas Neue", "Arial Narrow", sans-serif; }
.feature-icon { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; border-radius: 12px; background: linear-gradient(135deg, rgba(0,212,255,0.16), rgba(0,245,160,0.08)); border: 1px solid rgba(0,212,255,0.28); color: var(--primary); margin-bottom: 18px; transition: transform 0.25s ease; }
.feature-icon svg { width: 22px; height: 22px; }
.feature-card:hover .feature-icon { transform: translateY(-2px); box-shadow: 0 0 16px rgba(0,212,255,0.2); }
.feature-card h3 { font-size: 18px; font-weight: 700; color: var(--text-title); margin-bottom: 8px; line-height: 1.4; }
.feature-card p { font-size: 14px; line-height: 1.7; color: var(--text-body); }

/* ===== 图文混排 ===== */
.content-split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.content-media { border-radius: var(--radius-panel); overflow: hidden; position: relative; }
.content-media img { width: 100%; height: 100%; min-height: 320px; object-fit: cover; }
.content-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 60%, rgba(5,7,13,0.75) 100%); }
.content-media .media-badge { position: absolute; left: 16px; bottom: 16px; z-index: 2; background: rgba(0,212,255,0.14); backdrop-filter: blur(8px); border: 1px solid rgba(0,212,255,0.25); color: var(--primary); font-size: 13px; padding: 6px 14px; border-radius: 999px; }
.content-body h2 { font-size: 26px; font-weight: 800; color: var(--text-title); line-height: 1.35; margin-bottom: 16px; }
.content-body h2 em { font-style: normal; color: var(--primary); }
.content-body p { font-size: 15px; color: var(--text-body); margin-bottom: 20px; line-height: 1.85; }
.check-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.check-list li { display: flex; align-items: flex-start; gap: 10px; font-size: 15px; color: rgba(255,255,255,0.82); line-height: 1.6; }
.check-list li svg { width: 18px; height: 18px; flex-shrink: 0; margin-top: 3px; color: var(--success); }
.content-split.reverse .content-media { order: 2; }
.content-split.reverse .content-body { order: 1; }

/* ===== 操作流程 ===== */
.steps-wrap { position: relative; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-item { position: relative; background: var(--bg-glass); border: 1px solid var(--border-glass); border-radius: var(--radius-card); padding: 28px 22px 22px; text-align: left; transition: all 0.25s ease; }
.step-item:hover { border-color: rgba(0,212,255,0.35); transform: translateY(-3px); }
.step-num { width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 16px; color: var(--primary); background: rgba(0,212,255,0.12); border: 1px solid rgba(0,212,255,0.35); box-shadow: 0 0 12px rgba(0,212,255,0.12); margin-bottom: 16px; }
.step-item h3 { font-size: 16px; font-weight: 700; color: var(--text-title); margin-bottom: 6px; }
.step-item p { font-size: 13px; color: var(--text-body); line-height: 1.7; }

/* ===== 数据区 ===== */
.data-banner { border-top: 1px solid rgba(255,255,255,0.08); border-bottom: 1px solid rgba(255,255,255,0.08); padding: 48px 0; background: rgba(10,16,29,0.5); }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.data-item { padding: 8px 32px; text-align: center; }
.data-item + .data-item { border-left: 1px solid rgba(255,255,255,0.08); }
.data-value { font-size: 44px; font-weight: 800; line-height: 1.25; background: linear-gradient(135deg, var(--primary), var(--primary-2)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; letter-spacing: -0.5px; font-family: "DIN Alternate", "Arial Narrow", sans-serif; }
.data-label { margin-top: 8px; font-size: 13px; color: var(--text-muted); letter-spacing: 1px; }

/* ===== FAQ ===== */
.faq-wrap { max-width: 860px; }
.faq-item { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.08); border-radius: 14px; margin-bottom: 14px; overflow: hidden; transition: all 0.25s ease; }
.faq-item.open { background: rgba(0,212,255,0.05); border-left: 3px solid var(--primary); padding-left: 0; }
.faq-q { display: flex; align-items: center; gap: 16px; padding: 0 20px; min-height: 52px; cursor: pointer; user-select: none; }
.faq-q .q-icon { color: var(--primary); font-weight: 800; font-size: 17px; flex-shrink: 0; }
.faq-q .q-text { flex: 1; font-size: 16px; font-weight: 600; color: rgba(255,255,255,0.9); line-height: 1.5; padding: 10px 0; }
.faq-q .arrow { width: 18px; height: 18px; flex-shrink: 0; color: rgba(255,255,255,0.5); transition: transform 0.2s ease; }
.faq-q .arrow svg { width: 18px; height: 18px; }
.faq-item.open .arrow { transform: rotate(180deg); color: var(--primary); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-a-inner { padding: 0 20px 18px 53px; font-size: 15px; color: var(--text-weak); line-height: 1.8; }

/* ===== CTA ===== */
.cta-section { padding: 24px 0 72px; }
.cta-panel { position: relative; border-radius: var(--radius-panel); padding: 48px 48px; background: linear-gradient(135deg, rgba(0,212,255,0.1), rgba(255,138,0,0.06)), rgba(255,255,255,0.04); border: 1px solid rgba(0,212,255,0.22); backdrop-filter: blur(14px); overflow: hidden; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.cta-panel::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, transparent, var(--primary), var(--primary-2), transparent); }
.cta-panel h2 { font-size: 26px; font-weight: 800; color: var(--text-title); line-height: 1.35; }
.cta-panel p { margin-top: 10px; font-size: 15px; color: var(--text-body); max-width: 520px; line-height: 1.8; }
.cta-actions { display: flex; gap: 14px; flex-shrink: 0; flex-wrap: wrap; }

/* ===== 页脚 ===== */
.footer { background: #04060C; border-top: 1px solid rgba(255,255,255,0.06); padding: 56px 0 28px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 40px; }
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p { font-size: 14px; line-height: 1.85; color: var(--text-muted); max-width: 320px; }
.footer-col h4 { font-size: 16px; font-weight: 600; color: rgba(255,255,255,0.9); margin-bottom: 16px; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col li { font-size: 14px; color: var(--text-weak); line-height: 1.6; }
.footer-col a { color: var(--text-weak); display: inline-block; transition: all 0.2s ease; }
.footer-col a:hover { color: var(--primary); transform: translateX(-4px); }
.footer-divider { border: none; border-top: 1px solid rgba(255,255,255,0.08); }
.footer-copy { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; padding-top: 20px; font-size: 13px; color: rgba(255,255,255,0.4); }
.footer-copy span:last-child { color: var(--text-muted); }

/* ===== 焦点与选中 ===== */
a:focus-visible, button:focus-visible, .faq-q:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
::selection { background: rgba(0,212,255,0.3); color: #fff; }

/* ===== 响应式 ===== */
@media (max-width: 1200px) {
  .grid-cards { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .data-grid { grid-template-columns: repeat(2, 1fr); }
  .data-item { padding: 24px 16px; }
  .data-item:nth-child(3) { border-left: none; }
  .data-item:nth-child(n+3) { border-top: 1px solid rgba(255,255,255,0.08); }
  .cta-panel { flex-direction: column; text-align: center; padding: 40px 32px; align-items: center; }
  .cta-actions { justify-content: center; }
}
@media (max-width: 992px) {
  .header-inner { gap: 16px; }
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }
  .mobile-drawer { display: flex; opacity: 0; pointer-events: none; transition: opacity 0.2s ease; }
  .mobile-drawer.open { opacity: 1; pointer-events: auto; }
  .content-split { grid-template-columns: 1fr; gap: 32px; }
  .content-split.reverse .content-media { order: -1; }
  .content-media img { min-height: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  body { font-size: 15px; }
  .container { padding: 0 16px; }
  .section { padding: var(--space-mobile) 0; }
  .page-hero { min-height: 300px; padding: 48px 0 32px; }
  .page-hero-title { font-size: 28px; }
  .page-hero-desc { font-size: 15px; }
  .breadcrumb { margin-bottom: 16px; }
  .section-title { font-size: 24px; }
  .section-desc { font-size: 14px; }
  .grid-cards { grid-template-columns: 1fr; gap: 14px; }
  .steps { grid-template-columns: 1fr; gap: 14px; }
  .data-grid { grid-template-columns: 1fr 1fr; }
  .data-value { font-size: 34px; }
  .data-item { padding: 18px 10px; }
  .cta-panel { padding: 32px 20px; }
  .cta-panel h2 { font-size: 22px; }
  .btn { padding: 0 20px; }
  .content-body h2 { font-size: 22px; }
  .faq-q .q-text { font-size: 15px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-copy { flex-direction: column; text-align: center; }
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }