/* roulang page: index */
:root {
  --bg-primary: #0A1526;
  --bg-secondary: #0B0F19;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --bg-footer: #06121F;
  --accent-cyan: #22D3EE;
  --accent-cyan-rgb: 34, 211, 238;
  --accent-amber: #F5A623;
  --accent-amber-rgb: 245, 166, 35;
  --text-primary: #E5EDF7;
  --text-secondary: #9AA8BC;
  --text-muted: #66738A;
  --border-default: rgba(255, 255, 255, 0.12);
  --border-hover: rgba(56, 189, 248, 0.4);
  --success: #10B981;
  --error: #EF4444;
  --warning: #F59E0B;
  --radius-xl: 20px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  --shadow-cta: 0 8px 32px rgba(34, 211, 238, 0.25);
  --shadow-amber: 0 8px 32px rgba(245, 166, 35, 0.15);
  --space-section-desktop: 108px;
  --space-section-mobile: 72px;
  --container-max: 1240px;
  --transition-base: all 0.3s ease;
  --nav-height: 116px;
}

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

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

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

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

a:hover {
  text-decoration: underline;
}

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

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

.section {
  padding-top: var(--space-section-desktop);
  padding-bottom: var(--space-section-desktop);
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 64px;
}

.section-head h2 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 16px;
}

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

.section-tag {
  display: inline-block;
  font-size: 13px;
  color: var(--accent-cyan);
  border: 1px solid rgba(var(--accent-cyan-rgb), 0.3);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
  background: rgba(var(--accent-cyan-rgb), 0.06);
}

.section-more {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 8px 20px;
  transition: var(--transition-base);
}

.section-more:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(var(--accent-cyan-rgb), 0.06);
  text-decoration: none;
  box-shadow: 0 0 20px rgba(var(--accent-cyan-rgb), 0.12);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  padding: 12px 28px;
  font-size: 15px;
  line-height: 1.4;
  border: 1px solid transparent;
  transition: var(--transition-base);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--accent-cyan);
  color: #092A3A;
  border-color: var(--accent-cyan);
}

.btn-primary:hover {
  background: #67E3F8;
  border-color: #67E3F8;
  box-shadow: 0 0 24px rgba(var(--accent-cyan-rgb), 0.5);
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 0 12px rgba(var(--accent-cyan-rgb), 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-outline:hover {
  border-color: var(--accent-cyan);
  background: rgba(var(--accent-cyan-rgb), 0.08);
  color: var(--accent-cyan);
  text-decoration: none;
}

.btn-outline:active {
  transform: translateY(1px);
}

.btn-amber {
  background: var(--accent-amber);
  color: #3D2400;
  border-color: var(--accent-amber);
}

.btn-amber:hover {
  background: #FFC043;
  border-color: #FFC043;
  box-shadow: 0 0 24px rgba(var(--accent-amber-rgb), 0.4);
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 14px;
}

.btn-full {
  width: 100%;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-default);
  background: transparent;
  color: var(--text-secondary);
  transition: var(--transition-base);
}

.icon-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--border-hover);
  background: rgba(var(--accent-cyan-rgb), 0.06);
}

.icon-btn:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 21, 38, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-brand-row {
  padding: 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.header-brand-row .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-logo {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-logo:hover {
  text-decoration: none;
}

.brand-main {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.brand-sub {
  font-size: 14px;
  font-weight: 500;
  color: var(--accent-cyan);
  letter-spacing: 0.08em;
  border-left: 1px solid rgba(var(--accent-cyan-rgb), 0.3);
  padding-left: 10px;
  margin-left: 4px;
}

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

.header-nav-row {
  padding: 0;
}

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

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

.channel-link {
  display: inline-flex;
  align-items: center;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  position: relative;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: var(--transition-base);
}

.channel-link:hover {
  color: var(--text-primary);
  text-decoration: none;
}

.channel-link:hover::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 18px;
  right: 18px;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
  opacity: 0.5;
}

.channel-link.active {
  color: var(--accent-cyan);
  font-weight: 600;
}

.channel-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 18px;
  right: 18px;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
}

/* Hero */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 80px 0 100px;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(10, 21, 38, 0.97) 0%, rgba(10, 21, 38, 0.82) 55%, rgba(10, 21, 38, 0.55) 100%);
  z-index: 1;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(circle, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 36px 36px;
  z-index: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 3;
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(var(--accent-cyan-rgb), 0.08);
  border: 1px solid rgba(var(--accent-cyan-rgb), 0.25);
  border-radius: 999px;
  padding: 6px 18px;
  font-size: 13px;
  color: var(--accent-cyan);
  margin-bottom: 28px;
  letter-spacing: 0.04em;
}

.hero h1 {
  font-size: clamp(34px, 5.2vw, 52px);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.01em;
  margin-bottom: 24px;
}

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

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 560px;
  margin: 0 auto 36px;
}

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

.hero-features {
  display: flex;
  justify-content: center;
  gap: 28px;
  margin-top: 64px;
  flex-wrap: wrap;
}

.hero-feature {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
}

.hero-feature svg {
  flex-shrink: 0;
}

.hero-feature span {
  font-weight: 500;
}

.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  transition: var(--transition-base);
}

.scroll-indicator:hover {
  color: var(--accent-cyan);
  text-decoration: none;
}

.scroll-indicator .chevron {
  animation: float 2.4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}

/* Features Section */
.features-section {
  background: var(--bg-primary);
}

.features-layout {
  display: grid;
  grid-template-columns: 1.1fr 1.4fr;
  gap: 24px;
  align-items: stretch;
}

.feature-main {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: var(--transition-base);
  backdrop-filter: blur(16px);
  min-height: 380px;
}

.feature-main::after {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(var(--accent-cyan-rgb), 0.12), transparent 70%);
  pointer-events: none;
}

.feature-main:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.feature-main .feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(var(--accent-cyan-rgb), 0.1);
  border: 1px solid rgba(var(--accent-cyan-rgb), 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.feature-main .feature-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 14px;
}

.feature-main .feature-text {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.7;
  max-width: 340px;
}

.features-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition-base);
  backdrop-filter: blur(16px);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.feature-card .feature-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: rgba(var(--accent-cyan-rgb), 0.08);
  border: 1px solid rgba(var(--accent-cyan-rgb), 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-card .feature-title {
  font-size: 17px;
  font-weight: 600;
}

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

/* Demo Section */
.demo-section {
  background: linear-gradient(180deg, var(--bg-primary) 0%, #0C1B30 50%, var(--bg-primary) 100%);
}

.demo-window {
  max-width: 980px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
  overflow: hidden;
}

.demo-window__top {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-default);
}

.demo-window__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.demo-window__dot--red { background: #FF5F57; }
.demo-window__dot--yellow { background: #FEBC2E; }
.demo-window__dot--green { background: #28C840; }

.demo-window__address {
  flex: 1;
  margin-left: 12px;
  padding: 6px 16px;
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.05);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.demo-window__body {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 0;
}

.demo-login {
  padding: 40px;
  border-right: 1px solid var(--border-default);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.demo-login__brand {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.demo-login__brand .logo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(var(--accent-cyan-rgb), 0.6);
}

.demo-login__field {
  margin-bottom: 16px;
}

.demo-login__field label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.demo-login__field .demo-input {
  width: 100%;
  padding: 10px 14px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-muted);
  cursor: not-allowed;
}

.demo-login__btn {
  margin-top: 8px;
  background: var(--accent-cyan);
  color: #092A3A;
  border-radius: var(--radius-sm);
  padding: 11px 0;
  text-align: center;
  font-weight: 600;
  font-size: 14px;
  opacity: 0.75;
}

.demo-panel {
  padding: 0;
  position: relative;
  min-height: 420px;
}

.demo-panel img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 420px;
}

.demo-panel .demo-panel__label {
  position: absolute;
  bottom: 16px;
  left: 16px;
  background: rgba(10, 21, 38, 0.75);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 13px;
  color: var(--text-secondary);
  backdrop-filter: blur(8px);
}

.demo-note {
  text-align: center;
  margin-top: 24px;
  font-size: 13px;
  color: var(--text-muted);
}

/* Evidence Section */
.evidence-section {
  background: var(--bg-primary);
}

.evidence-layout {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 48px;
  align-items: center;
}

.evidence-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-default);
}

.evidence-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 300px;
}

.evidence-visual .evidence-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(10, 21, 38, 0.7);
  border: 1px solid rgba(var(--accent-cyan-rgb), 0.3);
  backfrop-filter: blur(8px);
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  font-size: 13px;
  color: var(--accent-cyan);
}

.evidence-content {
  padding: 16px 0;
}

.evidence-content h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}

.evidence-content > p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 28px;
}

.evidence-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.evidence-item {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition-base);
}

.evidence-item:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.evidence-value {
  font-size: 36px;
  font-weight: 700;
  color: var(--accent-amber);
  line-height: 1.2;
  font-family: 'Inter', 'Roboto', sans-serif;
  letter-spacing: -0.01em;
}

.evidence-label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 6px;
}

/* Latest Section */
.latest-section {
  background: var(--bg-primary);
}

.latest-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 48px;
}

.latest-head .section-title {
  max-width: 500px;
}

.latest-head .section-title h2 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
}

.latest-head .section-title p {
  color: var(--text-secondary);
  font-size: 15px;
}

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

.post-card {
  display: grid;
  grid-template-columns: 130px 1fr auto 40px;
  align-items: center;
  gap: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  transition: var(--transition-base);
  text-decoration: none;
  position: relative;
}

.post-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.post-card__meta {
  font-size: 13px;
  color: var(--text-muted);
  font-family: 'Inter', 'Roboto', sans-serif;
  white-space: nowrap;
}

.post-card__title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.45;
  margin-bottom: 6px;
  transition: var(--transition-base);
}

.post-card:hover .post-card__title {
  color: var(--accent-cyan);
}

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

.post-card__category {
  display: inline-flex;
  align-items: center;
  background: rgba(var(--accent-cyan-rgb), 0.08);
  border: 1px solid rgba(var(--accent-cyan-rgb), 0.2);
  color: var(--accent-cyan);
  font-size: 12px;
  border-radius: 999px;
  padding: 4px 12px;
  white-space: nowrap;
}

.post-card__arrow {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: var(--transition-base);
}

.post-card:hover .post-card__arrow {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  background: rgba(var(--accent-cyan-rgb), 0.08);
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  background: var(--bg-card);
  border: 1px dashed var(--border-default);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-size: 15px;
}

.empty-state .empty-state__icon {
  margin-bottom: 16px;
  opacity: 0.5;
}

/* Pricing Section */
.pricing-section {
  background: var(--bg-primary);
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr 1fr;
  gap: 24px;
  align-items: stretch;
  max-width: 1080px;
  margin: 0 auto;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  transition: var(--transition-base);
  backdrop-filter: blur(16px);
  position: relative;
}

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

.price-card--featured {
  border-color: var(--accent-amber);
  box-shadow: var(--shadow-amber);
  background: rgba(245, 166, 35, 0.03);
  padding-top: 48px;
  padding-bottom: 48px;
}

.price-card--featured:hover {
  transform: translateY(-4px);
  border-color: var(--accent-amber);
  box-shadow: 0 12px 40px rgba(245, 166, 35, 0.2);
}

.price-badge {
  position: absolute;
  top: -14px;
  right: 24px;
  background: var(--accent-amber);
  color: #3D2400;
  font-size: 12px;
  font-weight: 600;
  border-radius: 999px;
  padding: 4px 14px;
  letter-spacing: 0.04em;
}

.price-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.price-amount {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.2;
  font-family: 'Inter', 'Roboto', sans-serif;
  margin-bottom: 8px;
}

.price-amount .unit {
  font-size: 16px;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 4px;
}

.price-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.price-list {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.price-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.price-list li svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--success);
}

.price-list li .muted {
  color: var(--text-muted);
}

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

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-item.open {
  border-color: var(--border-hover);
  background: rgba(var(--accent-cyan-rgb), 0.03);
}

.faq-item.open {
  border-left: 3px solid var(--accent-cyan);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  background: transparent;
  border: none;
  text-align: left;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
  transition: var(--transition-base);
}

.faq-question:hover {
  color: var(--accent-cyan);
}

.faq-question:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: -2px;
  border-radius: var(--radius-md);
}

.faq-question__icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: var(--transition-base);
}

.faq-item.open .faq-question__icon {
  transform: rotate(45deg);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 24px;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 24px 24px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* CTA Section */
.cta-section {
  padding-top: 0;
  padding-bottom: var(--space-section-desktop);
  background: var(--bg-primary);
}

.cta-box {
  position: relative;
  border-radius: var(--radius-xl);
  padding: 64px 48px;
  text-align: center;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.06) 0%, rgba(245, 166, 35, 0.03) 100%);
  border: 1px solid rgba(var(--accent-cyan-rgb), 0.15);
}

.cta-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(circle, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.cta-box h2 {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.cta-box p {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 32px;
  position: relative;
  z-index: 1;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

/* Footer */
.site-footer {
  background: var(--bg-footer);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-brand .brand-logo {
  margin-bottom: 16px;
}

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

.footer-links h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 14px;
  transition: var(--transition-base);
}

.footer-links a:hover {
  color: var(--accent-cyan);
  text-decoration: none;
}

.footer-copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-muted);
}

/* Floating CTA */
.floating-cta {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 90;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.floating-cta .btn {
  box-shadow: var(--shadow-cta);
}

.floating-cta__close {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border-default);
  background: rgba(10, 21, 38, 0.85);
  backdrop-filter: blur(8px);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: var(--transition-base);
}

.floating-cta__close:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

/* Responsive */
@media (max-width: 1024px) {
  .features-layout {
    grid-template-columns: 1fr;
  }

  .feature-main {
    min-height: auto;
  }

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

  .pricing-grid {
    grid-template-columns: 1fr 1fr;
    max-width: 760px;
  }

  .price-card--featured {
    order: -1;
  }

  .pricing-grid .price-card:last-child {
    grid-column: span 2;
    max-width: 460px;
    margin: 0 auto;
    width: 100%;
  }

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

@media (max-width: 768px) {
  :root {
    --space-section-desktop: 72px;
  }

  .section {
    padding-top: var(--space-section-mobile);
    padding-bottom: var(--space-section-mobile);
  }

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

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

  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .header-brand-row .container {
    flex-wrap: wrap;
  }

  .brand-main {
    font-size: 19px;
  }

  .brand-sub {
    font-size: 12px;
    padding-left: 8px;
  }

  .header-tools .btn-sm {
    padding: 6px 14px;
    font-size: 13px;
  }

  .hero {
    min-height: 85vh;
    padding: 70px 0 90px;
  }

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

  .hero-subtitle {
    font-size: 16px;
  }

  .hero-features {
    gap: 16px;
    margin-top: 40px;
    flex-direction: column;
    align-items: center;
  }

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

  .demo-window__body {
    grid-template-columns: 1fr;
  }

  .demo-login {
    padding: 28px;
    border-right: none;
    border-bottom: 1px solid var(--border-default);
  }

  .demo-panel img {
    min-height: 240px;
  }

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

  .evidence-value {
    font-size: 28px;
  }

  .latest-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .post-card {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 20px;
  }

  .post-card__meta {
    order: -1;
  }

  .post-card__category {
    align-self: flex-start;
  }

  .post-card__arrow {
    display: none;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 460px;
  }

  .pricing-grid .price-card:last-child {
    grid-column: auto;
    max-width: none;
  }

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

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

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

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

  .floating-cta {
    bottom: 16px;
    right: 16px;
  }

  .floating-cta .btn {
    padding: 10px 20px;
    font-size: 14px;
  }
}

@media (max-width: 520px) {
  .header-brand-row .container {
    gap: 8px;
  }

  .header-tools .btn-outline {
    display: none;
  }

  .hero h1 {
    font-size: 28px;
    line-height: 1.35;
  }

  .hero-actions {
    flex-direction: column;
  }

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

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

  .evidence-item {
    padding: 16px;
  }

  .evidence-value {
    font-size: 24px;
  }

  .channel-link {
    padding: 14px 14px;
    font-size: 14px;
  }

  .feature-main {
    padding: 28px 22px;
  }

  .feature-card {
    padding: 22px;
  }

  .price-card {
    padding: 28px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* roulang page: article */
:root {
  --bg-primary: #0A1526;
  --bg-footer: #06121F;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.07);
  --bg-input: rgba(255, 255, 255, 0.05);
  --accent: #22D3EE;
  --accent-hover: #67E8F9;
  --accent-glow: rgba(34, 211, 238, 0.35);
  --accent-dark: #092A3A;
  --gold: #F5A623;
  --gold-glow: rgba(245, 166, 35, 0.18);
  --text-primary: #E5EDF7;
  --text-secondary: #9AA8BC;
  --text-muted: #66738A;
  --border-default: rgba(255, 255, 255, 0.12);
  --border-hover: rgba(56, 189, 248, 0.4);
  --success: #10B981;
  --error: #EF4444;
  --warning: #F59E0B;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  --shadow-cta: 0 8px 32px rgba(34, 211, 238, 0.25);
  --shadow-gold: 0 8px 32px rgba(245, 166, 35, 0.16);
  --font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-en: "Inter", "Roboto", sans-serif;
  --container: 1240px;
  --space-lg: 96px;
  --space-md: 64px;
  --space-sm: 40px;
  --transition: 0.25s ease;
}
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-cn);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--accent-hover);
}
button {
  font-family: inherit;
  border: none;
  cursor: pointer;
  background: none;
}
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  transition: all var(--transition);
  text-align: center;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: var(--accent-dark);
}
.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--accent-dark);
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.5);
}
.btn-primary:active {
  transform: translateY(1px);
}
.btn-primary:focus-visible,
.btn-outline:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.btn-outline {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: var(--text-primary);
}
.btn-outline:hover {
  border-color: var(--accent);
  background: rgba(34, 211, 238, 0.08);
  color: var(--accent-hover);
}
.btn-outline:active {
  transform: translateY(1px);
}
.btn-sm {
  padding: 7px 14px;
  font-size: 13px;
  border-radius: var(--radius-sm);
}
.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
  border-radius: var(--radius-md);
}
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  background: transparent;
  transition: all var(--transition);
}
.icon-btn:hover {
  border-color: var(--border-hover);
  color: var(--accent);
  background: rgba(34, 211, 238, 0.06);
}
.icon-btn:active {
  transform: scale(0.96);
}
.tag {
  display: inline-flex;
  align-items: center;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.2);
  color: var(--accent);
  font-size: 12px;
  font-weight: 500;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 21, 38, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.header-brand-row {
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.header-brand-row .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 16px;
}
.brand-logo {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  line-height: 1.2;
}
.brand-main {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 1px;
}
.brand-sub {
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  border: 1px solid rgba(34, 211, 238, 0.35);
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.5px;
}
.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
}
.header-nav-row {
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.channel-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  min-height: 50px;
  padding: 8px 0;
}
.channel-nav::-webkit-scrollbar {
  display: none;
}
.channel-link {
  position: relative;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color var(--transition), background var(--transition);
}
.channel-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}
.channel-link.active {
  color: var(--accent);
  background: rgba(34, 211, 238, 0.08);
}
.channel-link.active::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

/* ===== Article Layout ===== */
.article-main {
  flex: 1;
  padding: 48px 0 0;
}
.article-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--text-muted);
}
.article-breadcrumb a {
  color: var(--text-secondary);
}
.article-breadcrumb a:hover {
  color: var(--accent);
}
.article-breadcrumb .sep {
  color: var(--text-muted);
}
.article-breadcrumb .current {
  color: var(--text-primary);
  font-weight: 500;
  max-width: 360px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.article-header {
  max-width: 860px;
  margin: 0 auto 40px;
  text-align: center;
  padding: 0 8px;
}
.article-header h1 {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.5px;
  color: var(--text-primary);
  margin-bottom: 24px;
  word-break: break-word;
}
.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px 32px;
  color: var(--text-muted);
  font-size: 14px;
}
.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}
.meta-item svg {
  width: 16px;
  height: 16px;
  color: var(--accent);
  opacity: 0.7;
}
.article-content-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
}
.article-content {
  max-width: 100%;
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-primary);
}
.article-content > * + * {
  margin-top: 24px;
}
.article-content h2 {
  font-size: 26px;
  font-weight: 700;
  line-height: 1.45;
  margin-top: 40px;
  padding-left: 16px;
  border-left: 4px solid var(--accent);
  color: var(--text-primary);
}
.article-content h3 {
  font-size: 21px;
  font-weight: 600;
  margin-top: 32px;
  color: var(--text-primary);
}
.article-content p {
  color: var(--text-secondary);
  line-height: 1.8;
}
.article-content a {
  color: var(--accent);
  border-bottom: 1px solid rgba(34, 211, 238, 0.3);
}
.article-content a:hover {
  border-bottom-color: var(--accent);
}
.article-content img {
  border-radius: var(--radius-md);
  margin: 32px auto;
  box-shadow: var(--shadow-card);
}
.article-content figcaption {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: -20px;
  margin-bottom: 24px;
}
.article-content blockquote {
  position: relative;
  padding: 20px 24px;
  background: rgba(34, 211, 238, 0.05);
  border: 1px solid rgba(34, 211, 238, 0.15);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-style: normal;
}
.article-content blockquote::before {
  content: "“";
  position: absolute;
  left: 12px;
  top: 6px;
  font-size: 32px;
  color: var(--accent);
  opacity: 0.5;
}
.article-content ul,
.article-content ol {
  padding-left: 24px;
  color: var(--text-secondary);
}
.article-content li {
  margin-bottom: 8px;
}
.article-content li::marker {
  color: var(--accent);
}
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 15px;
}
.article-content th,
.article-content td {
  padding: 12px 16px;
  border: 1px solid var(--border-default);
  text-align: left;
}
.article-content th {
  background: rgba(34, 211, 238, 0.05);
  color: var(--text-primary);
  font-weight: 600;
}
.article-content code {
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.15);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--accent);
}
.article-empty {
  text-align: center;
  padding: 80px 24px;
}
.article-empty p {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* ===== Article Tags ===== */
.article-tags {
  max-width: 860px;
  margin: 32px auto 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

/* ===== Related Articles ===== */
.related-articles {
  max-width: 1240px;
  margin: var(--space-lg) auto 0;
  padding: 0 24px;
}
.section-head {
  text-align: center;
  margin-bottom: 48px;
}
.section-head h2 {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 12px;
}
.section-head p {
  color: var(--text-secondary);
  font-size: 16px;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.related-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  color: var(--text-primary);
}
.related-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card);
  color: var(--text-primary);
}
.related-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}
.related-card__body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.related-card__body h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  transition: color var(--transition);
}
.related-card:hover .related-card__body h3 {
  color: var(--accent);
}
.related-card__body p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}
.related-card__body span {
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
}
.article-back {
  text-align: center;
  margin-top: 48px;
}

/* ===== Article CTA ===== */
.article-cta {
  max-width: 1240px;
  margin: var(--space-lg) auto;
  padding: 0 24px;
}
.article-cta__inner {
  position: relative;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.06), rgba(245, 166, 35, 0.04));
  border: 1px solid rgba(34, 211, 238, 0.25);
  border-radius: var(--radius-lg);
  padding: 64px 48px;
  text-align: center;
  overflow: hidden;
}
.article-cta__inner::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(34, 211, 238, 0.1) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.4;
  pointer-events: none;
}
.article-cta__inner h2 {
  position: relative;
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.article-cta__inner p {
  position: relative;
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 32px;
}
.cta-actions {
  position: relative;
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-footer);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 64px 0 0;
  margin-top: auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-brand .brand-logo {
  margin-bottom: 16px;
}
.footer-brand p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
  max-width: 360px;
}
.footer-links h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 18px;
}
.footer-links ul {
  list-style: none;
  display: grid;
  gap: 10px;
}
.footer-links a {
  color: var(--text-secondary);
  font-size: 14px;
}
.footer-links a:hover {
  color: var(--accent);
}
.footer-copyright {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
  font-size: 13px;
}

/* ===== Floating CTA ===== */
.floating-cta {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  display: flex;
  align-items: center;
  gap: 4px;
  box-shadow: var(--shadow-cta);
  border-radius: var(--radius-sm);
  animation: floatIn 0.35s ease both;
}
.floating-cta__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 16px;
  transition: background var(--transition), color var(--transition);
}
.floating-cta__close:hover {
  background: rgba(239, 68, 68, 0.25);
  color: #fff;
}
.floating-cta.hidden {
  display: none;
}
@keyframes floatIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .related-card:last-child {
    grid-column: 1 / -1;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 768px) {
  :root {
    --space-lg: 64px;
    --space-md: 48px;
  }
  .container {
    padding: 0 16px;
  }
  .header-brand-row .container {
    min-height: 60px;
  }
  .brand-main {
    font-size: 19px;
  }
  .brand-sub {
    font-size: 12px;
    padding: 1px 8px;
  }
  .header-tools .btn {
    display: none;
  }
  .icon-btn {
    width: 36px;
    height: 36px;
  }
  .channel-link {
    padding: 7px 12px;
    font-size: 13px;
  }
  .article-main {
    padding-top: 32px;
  }
  .article-breadcrumb {
    margin-bottom: 28px;
    font-size: 13px;
    padding: 10px 14px;
  }
  .article-header h1 {
    font-size: 27px;
    line-height: 1.45;
    margin-bottom: 16px;
  }
  .article-meta {
    gap: 10px 18px;
    font-size: 13px;
  }
  .article-content-wrap {
    padding: 28px 20px;
    border-radius: 16px;
  }
  .article-content {
    font-size: 16px;
  }
  .article-content h2 {
    font-size: 22px;
  }
  .article-content h3 {
    font-size: 19px;
  }
  .related-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .related-card:last-child {
    grid-column: auto;
  }
  .section-head h2 {
    font-size: 24px;
  }
  .article-cta__inner {
    padding: 48px 24px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-copyright {
    justify-content: center;
    text-align: center;
  }
  .floating-cta {
    right: 16px;
    bottom: 16px;
  }
  .floating-cta .btn {
    max-width: 168px;
    padding: 10px 16px;
    font-size: 14px;
    white-space: normal;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* roulang page: category1 */
:root {
  --bg-primary: #0A1526;
  --bg-footer: #06121F;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --bg-input: rgba(255, 255, 255, 0.05);
  --accent: #22D3EE;
  --accent-strong: #67E8F9;
  --accent-soft: rgba(34, 211, 238, 0.08);
  --gold: #F5A623;
  --success: #10B981;
  --error: #EF4444;
  --warning: #F59E0B;
  --text-primary: #E5EDF7;
  --text-secondary: #9AA8BC;
  --text-muted: #66738A;
  --border: rgba(255, 255, 255, 0.12);
  --border-hover: rgba(56, 189, 248, 0.4);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-float: 0 8px 32px rgba(34, 211, 238, 0.25);
  --shadow-gold: 0 8px 32px rgba(245, 166, 35, 0.15);
  --container: 1240px;
  --space-lg: 96px;
  --space-md: 64px;
  --space-sm: 32px;
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  text-decoration: underline;
  color: var(--accent-strong);
}

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

input,
select,
textarea {
  font-family: inherit;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  line-height: 1;
  padding: 12px 24px;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease, color 0.2s ease;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent);
  color: #092A3A;
}

.btn-primary:hover {
  background: var(--accent-strong);
  color: #092A3A;
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.5);
  text-decoration: none;
}

.btn-primary:disabled {
  background: var(--text-muted);
  color: rgba(255, 255, 255, 0.6);
  cursor: not-allowed;
  box-shadow: none;
}

.btn-outline {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  text-decoration: none;
}

.btn-outline:disabled {
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  cursor: not-allowed;
}

.btn-gold {
  background: var(--gold);
  color: #331C00;
}

.btn-gold:hover {
  background: #FFBB55;
  color: #331C00;
  box-shadow: 0 0 24px rgba(245, 166, 35, 0.4);
  text-decoration: none;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.icon-btn:hover {
  color: var(--accent);
  border-color: var(--border-hover);
  background: var(--accent-soft);
}

.icon-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.icon-btn:active {
  transform: translateY(1px);
}

.icon-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.section {
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.section-head {
  margin-bottom: 48px;
  max-width: 720px;
}

.section-head .sub-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(34, 211, 238, 0.2);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
}

.section-head h2 {
  font-size: 32px;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-head p {
  color: var(--text-secondary);
  margin-top: 14px;
  font-size: 16px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  background: rgba(34, 211, 238, 0.1);
  color: var(--accent);
  border: 1px solid rgba(34, 211, 238, 0.2);
}

.badge-gold {
  background: rgba(245, 166, 35, 0.12);
  color: var(--gold);
  border-color: rgba(245, 166, 35, 0.3);
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 21, 38, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-brand-row {
  padding: 14px 0;
}

.header-brand-row .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-logo {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 1;
  min-width: 0;
}

.brand-logo:hover {
  text-decoration: none;
}

.brand-main {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand-sub {
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.04em;
  border-left: 1px solid rgba(255, 255, 255, 0.18);
  padding-left: 8px;
  white-space: nowrap;
}

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

.header-nav-row {
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

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

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

.channel-link {
  display: block;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
  white-space: nowrap;
  text-decoration: none;
}

.channel-link:hover {
  color: var(--text-primary);
  text-decoration: none;
  border-bottom-color: rgba(34, 211, 238, 0.4);
}

.channel-link.active {
  color: var(--accent);
  font-weight: 600;
  border-bottom-color: var(--accent);
}

.channel-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
  border-radius: 4px;
}

/* ===== Hero ===== */
.page-hero {
  position: relative;
  padding: 96px 0 88px;
  background: radial-gradient(ellipse at 70% 20%, rgba(34, 211, 238, 0.12) 0%, transparent 55%),
              linear-gradient(180deg, rgba(10, 21, 38, 0.88) 0%, rgba(10, 21, 38, 0.94) 100%),
              url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.page-hero .hero-inner {
  max-width: 860px;
}

.page-hero .hero-badge {
  display: inline-block;
  margin-bottom: 20px;
}

.page-hero h1 {
  font-size: 44px;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

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

.page-hero .hero-desc {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 680px;
  line-height: 1.7;
  margin-bottom: 36px;
}

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

.hero-note {
  margin-top: 40px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

.hero-note svg {
  flex-shrink: 0;
}

/* ===== Feature Block ===== */
.feature-block {
  background: var(--bg-primary);
}

.feature-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 32px;
  align-items: stretch;
}

.feature-card--large {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.feature-card--large:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.feature-card--large::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent 70%);
  border-radius: 3px 3px 0 0;
}

.feature-card--large .card-index {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.feature-card--large h3 {
  font-size: 24px;
  line-height: 1.35;
  font-weight: 700;
  margin-bottom: 16px;
}

.feature-card--large p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.75;
  margin-bottom: 24px;
}

.feature-card--large .feature-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  line-height: 0;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-card--large .feature-media img {
  width: 100%;
  height: auto;
  min-height: 220px;
  object-fit: cover;
}

.feature-card--small {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.feature-card--small:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.feature-card--small .card-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 18px;
  border: 1px solid rgba(34, 211, 238, 0.2);
}

.feature-card--small h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.4;
}

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

.feature-cards-below {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}

/* ===== Benefits ===== */
.benefits {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02) 0%, transparent 100%);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.benefits-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
  align-items: start;
}

.benefits-rail {
  position: sticky;
  top: 160px;
}

.benefits-rail .sub-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--gold);
  background: rgba(245, 166, 35, 0.08);
  border: 1px solid rgba(245, 166, 35, 0.2);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
}

.benefits-rail h2 {
  font-size: 32px;
  line-height: 1.3;
  font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

.benefits-rail p {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.75;
}

.benefits-stack {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.benefit-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.benefit-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.benefit-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(34, 211, 238, 0.18);
}

.benefit-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

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

/* ===== Scenarios ===== */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.scenario-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.scenario-item:hover {
  border-color: var(--border-hover);
  background: rgba(255, 255, 255, 0.05);
}

.scenario-item .scenario-dot {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 10px;
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.12);
}

.scenario-item h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

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

/* ===== Steps ===== */
.steps {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02) 0%, transparent 100%);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  counter-reset: step-counter;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  counter-increment: step-counter;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.step-card::before {
  content: counter(step-counter);
  position: absolute;
  top: 22px;
  right: 24px;
  font-size: 40px;
  font-weight: 800;
  line-height: 1;
  color: rgba(34, 211, 238, 0.14);
  font-family: "Inter", "Roboto", sans-serif;
}

.step-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
}

.step-card .step-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 14px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--accent-soft);
  border: 1px solid rgba(34, 211, 238, 0.15);
}

.step-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  padding-right: 30px;
}

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

/* ===== FAQ ===== */
.faq {
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 900px;
}

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

.faq-item.open {
  border-color: rgba(34, 211, 238, 0.35);
  background: rgba(255, 255, 255, 0.05);
  position: relative;
}

.faq-item.open::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  transition: color 0.2s ease;
}

.faq-question:hover {
  color: var(--accent);
}

.faq-question:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.faq-question .faq-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: transform 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
  border-color: var(--accent);
  color: var(--accent);
}

.faq-answer {
  display: none;
  padding: 0 24px 22px;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 16px;
}

.faq-item.open .faq-answer {
  display: block;
}

/* ===== CTA ===== */
.page-cta {
  position: relative;
  padding: 88px 0;
  background: linear-gradient(135deg, rgba(10, 21, 38, 0.92) 0%, rgba(10, 21, 38, 0.8) 100%),
              url('/assets/images/backpic/back-2.png') center/cover no-repeat;
}

.cta-panel {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.cta-panel h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-panel h2 .highlight {
  color: var(--gold);
}

.cta-panel p {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.75;
  margin-bottom: 32px;
}

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

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-footer);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 56px;
}

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

.footer-brand p {
  margin-top: 16px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.75;
  max-width: 380px;
}

.footer-links h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--accent);
  text-decoration: none;
}

.footer-copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 22px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .section {
    --space-lg: 72px;
  }

  .page-hero h1 {
    font-size: 38px;
  }

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

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

  .benefits-rail {
    position: static;
  }

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

@media (max-width: 768px) {
  .section {
    --space-lg: 56px;
    --space-md: 40px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

  .brand-main {
    font-size: 19px;
  }

  .brand-sub {
    font-size: 12px;
  }

  .header-tools .btn-outline {
    display: none;
  }

  .feature-card--large {
    padding: 28px;
  }

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

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

  .cta-panel {
    padding: 40px 24px;
  }

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

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

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

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

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

  .brand-sub {
    font-size: 11px;
    padding-left: 6px;
    gap: 6px;
  }

  .header-brand-row {
    padding: 10px 0;
  }

  .header-tools .icon-btn {
    width: 36px;
    height: 36px;
  }

  .btn-sm {
    padding: 7px 12px;
    font-size: 12px;
  }

  .page-hero {
    padding: 56px 0 56px;
  }

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

  .page-hero .hero-desc {
    font-size: 16px;
  }

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

  .benefits-rail h2 {
    font-size: 26px;
  }

  .cta-panel h2 {
    font-size: 26px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

  .cta-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

/* roulang page: category3 */
:root {
    --bg-primary: #0A1526;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-card-hover: rgba(255, 255, 255, 0.08);
    --bg-footer: #06121F;
    --bg-input: rgba(255, 255, 255, 0.06);
    --accent-cyan: #22D3EE;
    --accent-gold: #F5A623;
    --text-primary: #E5EDF7;
    --text-secondary: #9AA8BC;
    --text-muted: #66738A;
    --border-default: rgba(255, 255, 255, 0.12);
    --border-hover: rgba(56, 189, 248, 0.4);
    --border-gold: rgba(245, 166, 35, 0.6);
    --btn-cyan: #22D3EE;
    --btn-cyan-text: #092A3A;
    --success: #10B981;
    --error: #EF4444;
    --warning: #F59E0B;
    --radius-lg: 20px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.08);
    --shadow-float: 0 8px 32px rgba(34, 211, 238, 0.25);
    --spacing-section: 96px;
    --container-max: 1240px;
    --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", sans-serif;
    --font-num: "Inter", "Roboto", sans-serif;
  }

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

  html {
    scroll-behavior: smooth;
  }

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

  a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: color 0.2s ease;
  }

  a:hover {
    color: #67E8F9;
  }

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

  button {
    font-family: inherit;
    cursor: pointer;
  }

  input,
  select,
  textarea {
    font-family: inherit;
    font-size: 15px;
    background: var(--bg-input);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    padding: 12px 14px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
  }

  input:focus,
  select:focus,
  textarea:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 2px rgba(34, 211, 238, 0.2);
  }

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

  /* ===== Header ===== */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 21, 38, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-default);
  }

  .header-brand-row {
    padding: 12px 0;
  }

  .header-brand-row .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
  }

  .brand-logo {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    line-height: 1.2;
  }

  .brand-main {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 1px;
  }

  .brand-sub {
    font-size: 13px;
    font-weight: 500;
    color: var(--accent-cyan);
    padding: 3px 10px;
    border: 1px solid rgba(34, 211, 238, 0.35);
    border-radius: 999px;
    background: rgba(34, 211, 238, 0.06);
  }

  .header-tools {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: 1px solid var(--border-default);
    border-radius: 8px;
    color: var(--text-secondary);
    transition: all 0.2s;
  }

  .icon-btn:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    box-shadow: 0 0 12px rgba(34, 211, 238, 0.15);
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-weight: 600;
    font-size: 14px;
    border-radius: 8px;
    padding: 10px 20px;
    border: 1px solid transparent;
    transition: all 0.2s ease;
    white-space: nowrap;
  }

  .btn-sm {
    padding: 6px 14px;
    font-size: 13px;
  }

  .btn-primary {
    background: var(--btn-cyan);
    color: var(--btn-cyan-text);
  }

  .btn-primary:hover {
    background: #67E8F9;
    color: #092A3A;
    box-shadow: 0 0 24px rgba(34, 211, 238, 0.5);
  }

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

  .btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    box-shadow: none;
  }

  .btn-outline {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
  }

  .btn-outline:hover {
    border-color: var(--accent-cyan);
    background: rgba(34, 211, 238, 0.08);
    color: var(--accent-cyan);
    box-shadow: 0 0 16px rgba(34, 211, 238, 0.12);
  }

  .btn-outline:active {
    transform: translateY(1px);
  }

  .btn-gold {
    background: var(--accent-gold);
    color: #1a1405;
    border-color: var(--accent-gold);
  }

  .btn-gold:hover {
    background: #F7B83D;
    box-shadow: 0 0 24px rgba(245, 166, 35, 0.35);
  }

  .header-nav-row {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
  }

  .header-nav-row .container {
    display: flex;
    align-items: center;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .header-nav-row .container::-webkit-scrollbar {
    display: none;
  }

  .channel-nav {
    display: flex;
    gap: 4px;
    padding: 0;
  }

  .channel-link {
    display: inline-block;
    padding: 12px 18px;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-color 0.2s;
    white-space: nowrap;
    position: relative;
  }

  .channel-link:hover {
    color: var(--text-primary);
  }

  .channel-link:hover::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 14px;
    right: 14px;
    height: 2px;
    background: var(--accent-cyan);
    border-radius: 2px;
    opacity: 0.5;
  }

  .channel-link.active {
    color: var(--accent-cyan);
    font-weight: 600;
  }

  .channel-link.active::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 14px;
    right: 14px;
    height: 2px;
    background: var(--accent-cyan);
    border-radius: 2px;
  }

  /* ===== Category Hero ===== */
  .category-hero {
    position: relative;
    padding: 72px 0 64px;
    background: linear-gradient(to bottom, rgba(10, 21, 38, 0.85), rgba(10, 21, 38, 0.97)), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
    border-bottom: 1px solid var(--border-default);
  }

  .category-hero__inner {
    max-width: 800px;
  }

  .category-hero__tag {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 999px;
    background: rgba(34, 211, 238, 0.1);
    border: 1px solid rgba(34, 211, 238, 0.3);
    color: var(--accent-cyan);
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 20px;
  }

  .category-hero h1 {
    font-size: 38px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
    margin-bottom: 16px;
  }

  .category-hero h1 span {
    color: var(--accent-cyan);
  }

  .category-hero__desc {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 0;
  }

  /* ===== Category Main ===== */
  .category-main {
    padding: 72px 0 96px;
  }

  .category-grid {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 48px;
    align-items: start;
  }

  /* ===== Sidebar TOC ===== */
  .toc-sidebar {
    position: sticky;
    top: 140px;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    padding: 28px 24px;
    box-shadow: var(--shadow-card);
  }

  .toc-sidebar__title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 1px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-default);
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .toc-sidebar__title::before {
    content: "";
    width: 4px;
    height: 16px;
    background: var(--accent-cyan);
    border-radius: 4px;
  }

  .toc-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .toc-list li a {
    display: block;
    padding: 8px 12px;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 14px;
    transition: all 0.2s;
    border-left: 2px solid transparent;
  }

  .toc-list li a:hover {
    color: var(--accent-cyan);
    background: rgba(34, 211, 238, 0.06);
  }

  .toc-list li a.active {
    color: var(--accent-cyan);
    border-left-color: var(--accent-cyan);
    background: rgba(34, 211, 238, 0.08);
    font-weight: 500;
  }

  /* ===== Content ===== */
  .category-content {
    display: flex;
    flex-direction: column;
    gap: 32px;
  }

  .content-card {
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    padding: 36px 40px;
    box-shadow: var(--shadow-card);
  }

  .content-card h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-left: 14px;
    border-left: 3px solid var(--accent-cyan);
    line-height: 1.4;
  }

  .content-card h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 24px 0 12px;
  }

  .content-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
  }

  .content-card p:last-child {
    margin-bottom: 0;
  }

  .content-card ul,
  .content-card ol {
    color: var(--text-secondary);
    margin: 12px 0 20px 20px;
    line-height: 1.8;
  }

  .content-card li {
    margin-bottom: 8px;
  }

  .content-card li::marker {
    color: var(--accent-cyan);
  }

  .content-card strong {
    color: var(--text-primary);
    font-weight: 600;
  }

  .support-note {
    background: rgba(34, 211, 238, 0.07);
    border: 1px solid rgba(34, 211, 238, 0.25);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin-top: 24px;
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    gap: 10px;
    align-items: flex-start;
  }

  .support-note--gold {
    background: rgba(245, 166, 35, 0.08);
    border-color: rgba(245, 166, 35, 0.3);
  }

  .support-note svg {
    flex-shrink: 0;
    margin-top: 3px;
  }

  .steps-num {
    display: flex;
    gap: 16px;
    flex-direction: column;
    margin: 20px 0;
  }

  .step-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
  }

  .step-item__num {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(34, 211, 238, 0.12);
    border: 1px solid rgba(34, 211, 238, 0.4);
    color: var(--accent-cyan);
    font-size: 13px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
  }

  .step-item__body strong {
    display: block;
    color: var(--text-primary);
    font-size: 15px;
    margin-bottom: 4px;
  }

  .step-item__body p {
    color: var(--text-secondary);
    font-size: 14px;
    margin: 0;
  }

  .tags-wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
  }

  .tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 12px;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-default);
  }

  .tag--cyan {
    color: var(--accent-cyan);
    border-color: rgba(34, 211, 238, 0.3);
    background: rgba(34, 211, 238, 0.06);
  }

  .tag--gold {
    color: var(--accent-gold);
    border-color: rgba(245, 166, 35, 0.3);
    background: rgba(245, 166, 35, 0.06);
  }

  .stat-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 24px 0;
  }

  .stat-cell {
    text-align: center;
    padding: 16px 12px;
    border-radius: var(--radius-md);
    background: rgba(245, 166, 35, 0.06);
    border: 1px solid rgba(245, 166, 35, 0.2);
  }

  .stat-cell__num {
    font-family: var(--font-num);
    font-size: 30px;
    font-weight: 700;
    color: var(--accent-gold);
  }

  .stat-cell__label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
  }

  /* ===== CTA ===== */
  .cta-banner {
    margin-top: 56px;
    border-radius: var(--radius-lg);
    background: linear-gradient(120deg, rgba(34, 211, 238, 0.1) 0%, rgba(245, 166, 35, 0.08) 100%);
    border: 1px solid rgba(34, 211, 238, 0.2);
    padding: 48px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .cta-banner::before {
    content: "";
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(34, 211, 238, 0.15) 0%, transparent 70%);
    top: -120px;
    right: -80px;
    border-radius: 50%;
  }

  .cta-banner h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 14px;
  }

  .cta-banner p {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 28px;
    line-height: 1.8;
  }

  .cta-banner .cta-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 2;
  }

  /* ===== Back Home ===== */
  .back-home {
    margin-top: 32px;
    text-align: center;
  }

  .back-home a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 14px;
    transition: color 0.2s;
  }

  .back-home a:hover {
    color: var(--accent-cyan);
  }

  /* ===== Footer ===== */
  .site-footer {
    background: var(--bg-footer);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 56px 0 28px;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
  }

  .footer-brand p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.7;
    margin-top: 16px;
    max-width: 360px;
  }

  .footer-links h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: 0.5px;
  }

  .footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }

  .footer-links a {
    color: var(--text-muted);
    font-size: 14px;
    transition: color 0.2s;
  }

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

  .footer-copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    color: var(--text-muted);
    font-size: 13px;
  }

  /* ===== Floating CTA ===== */
  .float-cta {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 200;
  }

  .float-cta__inner {
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .float-cta__close {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(10, 21, 38, 0.9);
    border: 1px solid var(--border-default);
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
  }

  .float-cta__close:hover {
    color: var(--accent-cyan);
    border-color: var(--accent-cyan);
  }

  /* ===== Responsive ===== */
  @media (max-width: 1024px) {
    .category-grid {
      grid-template-columns: 220px 1fr;
      gap: 32px;
    }

    .content-card {
      padding: 28px;
    }
  }

  @media (max-width: 768px) {
    :root {
      --spacing-section: 64px;
    }

    .category-hero {
      padding: 48px 0 40px;
    }

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

    .category-hero__desc {
      font-size: 15px;
    }

    .category-main {
      padding: 48px 0 64px;
    }

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

    .toc-sidebar {
      position: static;
      top: auto;
      padding: 20px;
    }

    .toc-list {
      flex-direction: row;
      flex-wrap: wrap;
      gap: 4px 8px;
    }

    .toc-list li a {
      padding: 6px 10px;
      font-size: 13px;
    }

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

    .stat-row {
      grid-template-columns: 1fr;
    }

    .cta-banner {
      padding: 32px 20px;
    }

    .cta-banner h2 {
      font-size: 22px;
    }

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

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

    .float-cta {
      right: 16px;
      bottom: 16px;
    }
  }

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

    .header-tools .btn-outline {
      display: none;
    }

    .category-hero h1 {
      font-size: 26px;
    }

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

    .brand-sub {
      font-size: 11px;
      padding: 2px 8px;
    }

    .content-card h2 {
      font-size: 20px;
    }

    .content-card ul,
    .content-card ol {
      margin-left: 16px;
    }

    .channel-link {
      padding: 10px 12px;
      font-size: 14px;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      transition-duration: 0.01ms !important;
    }

    html {
      scroll-behavior: auto;
    }
  }

/* roulang page: category2 */
:root {
  --bg-primary: #0A1526;
  --bg-footer: #06121F;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.06);
  --accent-cyan: #22D3EE;
  --accent-cyan-soft: rgba(34,211,238,0.08);
  --accent-amber: #F5A623;
  --text-primary: #E5EDF7;
  --text-secondary: #9AA8BC;
  --text-muted: #66738A;
  --border-color: rgba(255,255,255,0.12);
  --border-hover: rgba(56,189,248,0.4);
  --success: #10B981;
  --danger: #EF4444;
  --warning: #F59E0B;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 4px 20px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.08);
  --shadow-float: 0 8px 32px rgba(34,211,238,0.25);
  --shadow-amber: 0 8px 32px rgba(245,166,35,0.15);
  --space-section: 96px;
  --space-section-mobile: 64px;
  --font-cn: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
  --font-en: 'Inter', 'Roboto', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}
body {
  font-family: var(--font-cn);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover {
  text-decoration: underline;
}
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}
input,
select,
textarea {
  font-family: inherit;
}
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}
/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  transition: all 0.25s ease;
  white-space: nowrap;
  text-decoration: none;
}
.btn:hover {
  text-decoration: none;
}
.btn:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
}
.btn:active {
  transform: translateY(1px);
}
.btn-primary {
  background: var(--accent-cyan);
  color: #092A3A;
}
.btn-primary:hover {
  background: #67E8F9;
  color: #092A3A;
  box-shadow: 0 0 24px rgba(34,211,238,0.5);
}
.btn-primary:disabled {
  background: #155E75;
  color: rgba(255,255,255,0.7);
  cursor: not-allowed;
  box-shadow: none;
}
.btn-outline {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.2);
  color: var(--text-primary);
}
.btn-outline:hover {
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-soft);
  color: var(--accent-cyan);
}
.btn-outline:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}
/* 导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 21, 38, 0.85);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.header-brand-row {
  padding: 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.header-brand-row .container,
.header-nav-row .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand-logo {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
  line-height: 1.2;
}
.brand-logo:hover {
  text-decoration: none;
}
.brand-main {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.5px;
}
.brand-sub {
  font-size: 14px;
  font-weight: 500;
  color: var(--accent-cyan);
  letter-spacing: 1px;
}
.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
}
.icon-btn {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  border: 1px solid transparent;
  transition: all 0.2s ease;
}
.icon-btn:hover {
  color: var(--accent-cyan);
  background: var(--accent-cyan-soft);
  border-color: rgba(34, 211, 238, 0.3);
}
.icon-btn:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}
.header-nav-row {
  background: transparent;
}
.channel-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding: 0;
}
.channel-nav::-webkit-scrollbar {
  display: none;
}
.channel-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease;
}
.channel-link::after {
  content: '';
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 4px;
  height: 2px;
  background: transparent;
  border-radius: 2px;
  transition: background 0.25s ease;
}
.channel-link:hover {
  color: var(--text-primary);
  text-decoration: none;
}
.channel-link:hover::after {
  background: var(--accent-cyan);
}
.channel-link.active {
  color: var(--accent-cyan);
  font-weight: 600;
}
.channel-link.active::after {
  background: var(--accent-cyan);
}
.channel-link:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: -2px;
  border-radius: 8px;
}
/* Hero */
.page-hero {
  position: relative;
  min-height: 68vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 100px 0 80px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 21, 38, 0.7) 0%, rgba(10, 21, 38, 0.92) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 860px;
}
.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-cyan);
  background: var(--accent-cyan-soft);
  border: 1px solid rgba(34, 211, 238, 0.3);
  margin-bottom: 24px;
  letter-spacing: 1px;
}
.page-hero h1 {
  font-size: 42px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.page-hero .hero-desc {
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 680px;
  margin-bottom: 32px;
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
/* 板块 */
.section {
  padding: var(--space-section) 0;
}
.section-header {
  max-width: 760px;
  margin-bottom: 48px;
}
.section-header .section-tag {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-cyan);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
}
.section-header h2 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.section-header p {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
}
/* 核心能力 */
.capability-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: center;
}
.capability-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  min-height: 360px;
}
.capability-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 360px;
}
.capability-visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 21, 38, 0) 40%, rgba(10, 21, 38, 0.4) 100%);
}
.capability-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.capability-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all 0.25s ease;
  box-shadow: var(--shadow-card);
}
.capability-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-3px);
}
.capability-card .cap-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--accent-cyan-soft);
  border: 1px solid rgba(34, 211, 238, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--accent-cyan);
}
.capability-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.capability-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}
/* 时间轴 */
.process-section {
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.02) 0%, transparent 100%);
}
.process-timeline {
  position: relative;
  max-width: 920px;
  margin: 0 auto;
}
.process-timeline::before {
  content: '';
  position: absolute;
  left: 108px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.55) 0%, rgba(34, 211, 238, 0.08) 100%);
}
.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 28px;
  padding: 24px 0;
}
.timeline-item:first-child {
  padding-top: 0;
}
.timeline-item:last-child {
  padding-bottom: 0;
}
.timeline-number {
  position: relative;
  z-index: 2;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en);
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(34, 211, 238, 0.15);
  text-align: center;
  line-height: 1;
}
.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.25s ease, background 0.25s ease;
}
.timeline-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}
.timeline-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.timeline-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
}
/* 应用场景 */
.scenario-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.scenario-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.25s ease;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}
.scenario-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent-cyan);
  opacity: 0;
  transition: opacity 0.25s ease;
}
.scenario-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
}
.scenario-card:hover::before {
  opacity: 1;
}
.scenario-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--accent-cyan-soft);
  border: 1px solid rgba(34, 211, 238, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  margin-bottom: 16px;
}
.scenario-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.scenario-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}
/* 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-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.25s ease, background 0.25s ease;
}
.faq-item.open {
  border-color: rgba(34, 211, 238, 0.4);
  background: var(--bg-card-hover);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  background: transparent;
  border: none;
  transition: color 0.2s ease;
}
.faq-question:hover {
  color: var(--accent-cyan);
}
.faq-question:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: -2px;
}
.faq-icon {
  margin-left: auto;
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-cyan-soft);
  color: var(--accent-cyan);
  font-size: 20px;
  font-weight: 400;
  transition: transform 0.2s ease, background 0.2s ease;
}
.faq-item.open .faq-icon {
  transform: rotate(45deg);
  background: rgba(34, 211, 238, 0.2);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.faq-answer-inner p {
  margin: 0;
}
/* CTA */
.cta-section {
  padding: 80px 0;
}
.cta-box {
  position: relative;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.08) 0%, rgba(10, 21, 38, 0.4) 100%);
  border: 1px solid rgba(34, 211, 238, 0.25);
  border-radius: 20px;
  padding: 56px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.cta-box::before {
  content: '';
  position: absolute;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(34, 211, 238, 0.06);
  top: -100px;
  right: -60px;
  filter: blur(48px);
}
.cta-box h2 {
  font-size: 30px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.cta-box p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 480px;
  line-height: 1.7;
}
.cta-actions {
  display: flex;
  gap: 12px;
  flex-shrink: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
}
/* 页脚 */
.site-footer {
  background: var(--bg-footer);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-brand .brand-logo {
  margin-bottom: 16px;
}
.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 360px;
  margin: 0;
}
.footer-links h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links ul a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}
.footer-links ul a:hover {
  color: var(--accent-cyan);
  text-decoration: none;
}
.footer-copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
}
/* 浮动 CTA */
.float-cta {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.float-cta .btn-float {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  background: var(--accent-cyan);
  color: #092A3A;
  font-size: 15px;
  font-weight: 600;
  border-radius: 999px;
  box-shadow: var(--shadow-float);
  transition: all 0.25s ease;
  text-decoration: none;
  white-space: nowrap;
}
.float-cta .btn-float:hover {
  background: #67E8F9;
  box-shadow: 0 8px 40px rgba(34, 211, 238, 0.45);
  text-decoration: none;
  transform: translateY(-2px);
}
.float-cta .float-close {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-muted);
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}
.float-cta .float-close:hover {
  background: rgba(255, 255, 255, 0.18);
  color: var(--text-primary);
}
.float-cta.hidden {
  display: none;
}
/* 返回首页 */
.back-home {
  text-align: center;
  padding: 48px 0 0;
}
.back-home .back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}
.back-home .back-link:hover {
  color: var(--accent-cyan);
  text-decoration: none;
}
/* 响应式 */
@media (max-width: 1024px) {
  .capability-grid {
    grid-template-columns: 1fr;
  }
  .capability-visual {
    min-height: 280px;
  }
  .capability-visual img {
    min-height: 280px;
  }
  .process-timeline::before {
    left: 92px;
  }
  .timeline-item {
    grid-template-columns: 80px 1fr;
  }
  .timeline-number {
    width: 64px;
    height: 64px;
    font-size: 18px;
  }
  .cta-box {
    flex-direction: column;
    text-align: center;
    padding: 40px 32px;
  }
  .cta-actions {
    justify-content: center;
  }
}
@media (max-width: 768px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .section {
    padding: var(--space-section-mobile) 0;
  }
  .brand-main {
    font-size: 18px;
  }
  .brand-sub {
    font-size: 12px;
  }
  .header-tools .btn-outline {
    display: none;
  }
  .channel-link {
    padding: 10px 12px;
    font-size: 14px;
  }
  .page-hero {
    padding: 80px 0 60px;
    min-height: auto;
  }
  .page-hero h1 {
    font-size: 30px;
  }
  .page-hero .hero-desc {
    font-size: 16px;
  }
  .section-header h2 {
    font-size: 26px;
  }
  .timeline-item {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 16px 0;
  }
  .process-timeline::before {
    display: none;
  }
  .timeline-number {
    width: 56px;
    height: 56px;
    font-size: 16px;
    margin-bottom: 4px;
  }
  .timeline-card {
    padding: 20px;
  }
  .scenario-grid {
    grid-template-columns: 1fr;
  }
  .cta-box {
    padding: 32px 20px;
  }
  .cta-box h2 {
    font-size: 24px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-bottom: 32px;
  }
  .footer-copyright {
    flex-direction: column;
    text-align: center;
    padding: 16px 0;
  }
  .float-cta {
    right: 16px;
    bottom: 16px;
    max-width: 180px;
  }
  .float-cta .btn-float {
    padding: 12px 18px;
    font-size: 14px;
  }
}
@media (max-width: 520px) {
  .brand-sub {
    display: none;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .page-hero h1 {
    font-size: 26px;
  }
  .cta-actions {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }
  .cta-actions .btn {
    width: 100%;
  }
}