/* ============================================
   Glassmorphism + Gradient Mesh Theme
   Palette: Coral #FF6B6B → Indigo #4F46E5 → Teal #0D9488
   ============================================ */

:root {
  --coral: #FF6B6B;
  --coral-light: #FF8A8A;
  --indigo: #4F46E5;
  --indigo-light: #6366F1;
  --teal: #0D9488;
  --teal-light: #14B8A6;
  --dark: #0F172A;
  --dark-soft: #1E293B;
  --gray-100: #F8FAFC;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-500: #64748B;
  --gray-700: #334155;
  --gray-900: #0F172A;
  --white: #FFFFFF;
  --glass-bg: rgba(255,255,255,0.65);
  --glass-border: rgba(255,255,255,0.3);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.08);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --max-w: 1200px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes meshFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 15px) scale(0.95); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(79,70,229,0.3); }
  50% { box-shadow: 0 0 20px 6px rgba(79,70,229,0.15); }
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  color: var(--gray-900);
  background: var(--gray-100);
  line-height: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: var(--indigo); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--coral); }
button { cursor: pointer; font-family: inherit; }

/* ============================================
   Mesh Background Blobs
   ============================================ */
.mesh-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.mesh-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.35;
  animation: meshFloat 12s ease-in-out infinite;
}

.mesh-blob--coral {
  width: 500px; height: 500px;
  background: var(--coral);
  top: -10%; left: -5%;
}

.mesh-blob--indigo {
  width: 600px; height: 600px;
  background: var(--indigo);
  top: 30%; right: -10%;
  animation-delay: -4s;
}

.mesh-blob--teal {
  width: 450px; height: 450px;
  background: var(--teal);
  bottom: -5%; left: 20%;
  animation-delay: -8s;
}

/* ============================================
   Navigation — Frosted Glass Sticky Bar
   ============================================ */
.main-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
}

.nav-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--dark);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 4px;
}

.nav-links a {
  display: block;
  padding: 8px 20px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-700);
  transition: all var(--transition);
}

.nav-links a:hover {
  background: var(--gray-200);
  color: var(--dark);
}

.nav-links a.active {
  background: linear-gradient(135deg, var(--indigo), var(--teal));
  color: var(--white);
  font-weight: 600;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 22px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--coral), var(--indigo));
  color: var(--white);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79,70,229,0.3);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 6px;
}

/* ============================================
   Container & Section Utilities
   ============================================ */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-label {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(79,70,229,0.1), rgba(13,148,136,0.1));
  color: var(--indigo);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--dark);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--gray-500);
  max-width: 640px;
  line-height: 1.7;
}

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

/* ============================================
   Glass Card
   ============================================ */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--glass-shadow);
  transition: all var(--transition);
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.12);
}

/* ============================================
   Hero Section — Asymmetric Split
   ============================================ */
.hero {
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  padding: 60px 0 80px;
  position: relative;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 8px;
  border-radius: 999px;
  background: rgba(79,70,229,0.08);
  border: 1px solid rgba(79,70,229,0.15);
  font-size: 0.8rem;
  color: var(--indigo);
  font-weight: 500;
  margin-bottom: 20px;
}

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

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--dark);
  margin-bottom: 20px;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--coral), var(--indigo), var(--teal));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--gray-500);
  line-height: 1.8;
  margin-bottom: 32px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--indigo), var(--teal));
  color: var(--white);
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition);
  animation: pulseGlow 3s ease-in-out infinite;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(79,70,229,0.35);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border: 2px solid var(--gray-300);
  border-radius: 999px;
  background: var(--white);
  color: var(--gray-700);
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition);
}

.btn-outline:hover {
  border-color: var(--indigo);
  color: var(--indigo);
  transform: translateY(-2px);
}

.hero-trust {
  display: flex;
  gap: 32px;
}

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

.trust-number {
  font-size: 1.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--indigo), var(--teal));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.trust-label {
  font-size: 0.8rem;
  color: var(--gray-500);
  font-weight: 500;
}

/* Hero Visual — Stacked Glass Panels */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.browser-mockup {
  width: 100%;
  max-width: 500px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--gray-200);
  box-shadow: 0 20px 60px rgba(0,0,0,0.1);
}

.browser-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--gray-100);
  border-bottom: 1px solid var(--gray-200);
}

.browser-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.browser-dot--red { background: #FF5F57; }
.browser-dot--yellow { background: #FFBD2E; }
.browser-dot--green { background: #28CA41; }

.browser-url {
  flex: 1;
  margin-left: 12px;
  padding: 6px 12px;
  border-radius: 6px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  font-size: 0.75rem;
  color: var(--gray-500);
  display: flex;
  align-items: center;
  gap: 6px;
}

.browser-body {
  padding: 32px;
  min-height: 260px;
  background: linear-gradient(135deg, rgba(79,70,229,0.03), rgba(13,148,136,0.03));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.browser-body .speed-ring {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: 6px solid var(--gray-200);
  border-top-color: var(--indigo);
  border-right-color: var(--teal);
  animation: spin 2s linear infinite;
}

.browser-body .speed-label {
  font-size: 0.9rem;
  color: var(--gray-500);
  font-weight: 500;
}

/* Floating accent cards near hero visual */
.hero-float-card {
  position: absolute;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: fadeInUp 0.6s ease-out both;
}

.hero-float-card--security {
  top: 10%;
  right: -10px;
  color: var(--teal);
  animation-delay: 0.3s;
}

.hero-float-card--speed {
  bottom: 15%;
  left: -15px;
  color: var(--coral);
  animation-delay: 0.6s;
}

/* ============================================
   Features — Hexagonal Offset Grid
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.feature-card {
  padding: 32px;
  text-align: left;
}

.feature-card:nth-child(2) {
  transform: translateY(24px);
}

.feature-card:nth-child(5) {
  transform: translateY(24px);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.feature-icon--indigo {
  background: linear-gradient(135deg, rgba(79,70,229,0.15), rgba(99,102,241,0.08));
  color: var(--indigo);
}

.feature-icon--coral {
  background: linear-gradient(135deg, rgba(255,107,107,0.15), rgba(255,138,138,0.08));
  color: var(--coral);
}

.feature-icon--teal {
  background: linear-gradient(135deg, rgba(13,148,136,0.15), rgba(20,184,166,0.08));
  color: var(--teal);
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.7;
}

/* ============================================
   Platform Download Strip
   ============================================ */
.platform-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.platform-card {
  padding: 28px 20px;
  text-align: center;
}

.platform-card .platform-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 14px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--gray-100), var(--white));
}

.platform-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.platform-card p {
  font-size: 0.78rem;
  color: var(--gray-500);
  margin-bottom: 16px;
}

.platform-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  border: none;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  transition: all var(--transition);
}

.platform-btn--primary {
  background: linear-gradient(135deg, var(--indigo), var(--teal));
  color: var(--white);
}

.platform-btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79,70,229,0.3);
}

.platform-btn--secondary {
  background: var(--gray-100);
  color: var(--gray-700);
  border: 1px solid var(--gray-200);
}

.platform-btn--secondary:hover {
  border-color: var(--indigo);
  color: var(--indigo);
  transform: translateY(-2px);
}

/* ============================================
   Reviews — Masonry-style stagger
   ============================================ */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.review-card {
  padding: 28px;
}

.review-card:nth-child(2) { transform: translateY(16px); }
.review-card:nth-child(5) { transform: translateY(16px); }

.review-stars {
  display: flex;
  gap: 3px;
  margin-bottom: 14px;
}

.review-text {
  font-size: 0.9rem;
  color: var(--gray-700);
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 10px;
}

.review-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--white);
}

.review-avatar--1 { background: linear-gradient(135deg, var(--coral), var(--indigo)); }
.review-avatar--2 { background: linear-gradient(135deg, var(--indigo), var(--teal)); }
.review-avatar--3 { background: linear-gradient(135deg, var(--teal), var(--coral)); }

.review-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--dark);
}

.review-role {
  font-size: 0.72rem;
  color: var(--gray-500);
}

/* ============================================
   FAQ — Accordion
   ============================================ */
.faq-list {
  max-width: 800px;
  margin: 40px auto 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border: none;
  background: transparent;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--dark);
  text-align: left;
  transition: all var(--transition);
}

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

.faq-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--gray-500);
}

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

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

.faq-item.open .faq-answer {
  max-height: 500px;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.8;
}

/* ============================================
   Comparison Table
   ============================================ */
.comparison-wrapper {
  overflow-x: auto;
  margin-top: 40px;
  border-radius: var(--radius);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
}

.comparison-table thead {
  background: linear-gradient(135deg, var(--indigo), var(--teal));
  color: var(--white);
}

.comparison-table th {
  padding: 14px 20px;
  text-align: left;
  font-weight: 600;
}

.comparison-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--glass-border);
  color: var(--gray-700);
}

.comparison-table tbody tr:hover {
  background: rgba(79,70,229,0.04);
}

.comparison-table .check {
  color: var(--teal);
  font-weight: 700;
}

.comparison-table .cross {
  color: var(--coral);
  font-weight: 700;
}

/* ============================================
   Download Page — Main Card
   ============================================ */
.dl-hero {
  padding: 80px 0 60px;
}

.dl-main-card {
  padding: 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  background: linear-gradient(135deg, var(--dark), var(--dark-soft));
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--white);
}

.dl-main-card h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.dl-main-card .dl-version {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 20px;
}

.dl-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 28px;
}

.dl-info-item {
  padding: 14px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
}

.dl-info-label {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.dl-info-value {
  font-size: 0.95rem;
  font-weight: 600;
}

.dl-main-btn {
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--coral), var(--indigo));
  color: var(--white);
  font-size: 1.05rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all var(--transition);
}

.dl-main-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255,107,107,0.3);
}

.dl-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.dl-visual svg {
  width: 200px;
  height: 200px;
  opacity: 0.8;
}

/* Other platforms grid */
.dl-platforms {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.dl-plat-card {
  padding: 28px;
  text-align: center;
}

.dl-plat-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--gray-100), var(--white));
}

.dl-plat-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.dl-plat-card p {
  font-size: 0.82rem;
  color: var(--gray-500);
  margin-bottom: 18px;
}

/* ============================================
   Installation Steps — Horizontal Timeline
   ============================================ */
.steps-track {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  margin-top: 48px;
  position: relative;
}

.steps-track::before {
  content: '';
  position: absolute;
  top: 28px;
  left: 10%;
  right: 10%;
  height: 3px;
  background: linear-gradient(90deg, var(--coral), var(--indigo), var(--teal));
  border-radius: 2px;
  z-index: 0;
}

.step-item {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-dot {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  background: var(--white);
  border: 3px solid var(--indigo);
  color: var(--indigo);
  box-shadow: 0 4px 12px rgba(79,70,229,0.15);
}

.step-item:nth-child(odd) .step-dot {
  border-color: var(--coral);
  color: var(--coral);
  box-shadow: 0 4px 12px rgba(255,107,107,0.15);
}

.step-item h4 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.step-item p {
  font-size: 0.78rem;
  color: var(--gray-500);
  line-height: 1.5;
  padding: 0 8px;
}

/* ============================================
   System Requirements — Tab Switcher
   ============================================ */
.tabs-nav {
  display: flex;
  gap: 4px;
  margin-bottom: 24px;
  border-radius: 999px;
  background: var(--gray-100);
  padding: 4px;
  width: fit-content;
}

.tab-btn {
  padding: 10px 24px;
  border: none;
  border-radius: 999px;
  background: transparent;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-500);
  transition: all var(--transition);
}

.tab-btn.active {
  background: var(--white);
  color: var(--indigo);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.req-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.req-table th,
.req-table td {
  padding: 14px 20px;
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
}

.req-table th {
  background: rgba(79,70,229,0.05);
  font-weight: 600;
  color: var(--dark);
  width: 200px;
}

.req-table td {
  color: var(--gray-700);
}

/* ============================================
   SEO Article (zh-cn) — Two-column with TOC
   ============================================ */
.article-hero {
  padding: 80px 0 40px;
  background: linear-gradient(135deg, rgba(79,70,229,0.06), rgba(13,148,136,0.04));
}

.article-hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 16px;
  line-height: 1.3;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.82rem;
  color: var(--gray-500);
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
  padding: 40px 0 80px;
}

.toc-sidebar {
  position: sticky;
  top: 88px;
  align-self: start;
}

.toc-card {
  padding: 24px;
}

.toc-card h3 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid linear-gradient(90deg, var(--indigo), var(--teal));
  border-image: linear-gradient(90deg, var(--indigo), var(--teal)) 1;
}

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

.toc-list a {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  font-size: 0.82rem;
  color: var(--gray-500);
  font-weight: 500;
  transition: all var(--transition);
  border-left: 2px solid transparent;
}

.toc-list a:hover,
.toc-list a.active {
  background: rgba(79,70,229,0.06);
  color: var(--indigo);
  border-left-color: var(--indigo);
}

.toc-dl-box {
  margin-top: 20px;
  padding: 20px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--indigo), var(--teal));
  color: var(--white);
  text-align: center;
}

.toc-dl-box p {
  font-size: 0.82rem;
  margin-bottom: 12px;
  opacity: 0.9;
}

.toc-dl-box a {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 999px;
  background: var(--white);
  color: var(--indigo);
  font-size: 0.82rem;
  font-weight: 600;
  transition: all var(--transition);
}

.toc-dl-box a:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.article-content {
  min-width: 0;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--dark);
  margin: 48px 0 16px;
  padding-left: 16px;
  border-left: 4px solid;
  border-image: linear-gradient(180deg, var(--indigo), var(--teal)) 1;
}

.article-content h2:first-child {
  margin-top: 0;
}

.article-content p {
  font-size: 0.95rem;
  color: var(--gray-700);
  line-height: 1.9;
  margin-bottom: 16px;
}

.article-content ul {
  margin: 12px 0 20px 20px;
  font-size: 0.92rem;
  color: var(--gray-700);
  line-height: 1.9;
}

.article-content li {
  margin-bottom: 6px;
}

.article-tip-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 20px 0;
}

.article-tip-card {
  padding: 20px;
}

.article-tip-card h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.article-tip-card p {
  font-size: 0.82rem;
  color: var(--gray-500);
  margin-bottom: 0;
}

.version-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin: 20px 0;
}

.version-table th,
.version-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
}

.version-table th {
  background: rgba(79,70,229,0.05);
  font-weight: 600;
  color: var(--dark);
}

.version-table td { color: var(--gray-700); }

/* CTA Banner */
.cta-banner {
  margin-top: 48px;
  padding: 40px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--coral), var(--indigo), var(--teal));
  color: var(--white);
  text-align: center;
}

.cta-banner h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.cta-banner p {
  font-size: 0.95rem;
  opacity: 0.9;
  margin-bottom: 24px;
}

.cta-banner a {
  display: inline-block;
  padding: 14px 36px;
  border-radius: 999px;
  background: var(--white);
  color: var(--indigo);
  font-weight: 700;
  font-size: 1rem;
  transition: all var(--transition);
}

.cta-banner a:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.2);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  padding: 40px 0;
  border-top: 1px solid var(--glass-border);
  text-align: center;
}

.footer-verify {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: 999px;
  background: rgba(13,148,136,0.08);
  color: var(--teal);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ============================================
   Security Banner (download page)
   ============================================ */
.security-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 16px;
  border-radius: var(--radius-sm);
  background: rgba(13,148,136,0.06);
  border: 1px solid rgba(13,148,136,0.15);
  color: var(--teal);
  font-size: 0.88rem;
  font-weight: 500;
  margin-top: 24px;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-visual { order: -1; }
  .hero h1 { font-size: 2.4rem; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-card:nth-child(2),
  .feature-card:nth-child(5) { transform: none; }
  .platform-strip { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .review-card:nth-child(2),
  .review-card:nth-child(5) { transform: none; }
  .dl-main-card { grid-template-columns: 1fr; }
  .dl-visual { display: none; }
  .dl-platforms { grid-template-columns: repeat(2, 1fr); }
  .steps-track { grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .steps-track::before { display: none; }
  .article-layout { grid-template-columns: 1fr; }
  .toc-sidebar { position: relative; top: 0; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(16px);
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--glass-border);
  }
  .hero h1 { font-size: 2rem; }
  .hero-trust { gap: 20px; }
  .features-grid { grid-template-columns: 1fr; }
  .platform-strip { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .dl-platforms { grid-template-columns: 1fr; }
  .steps-track { grid-template-columns: 1fr; gap: 16px; }
  .section { padding: 50px 0; }
  .section-title { font-size: 1.7rem; }
  .article-hero h1 { font-size: 1.8rem; }
  .article-tip-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .nav-container { padding: 0 16px; }
  .container { padding: 0 16px; }
  .hero h1 { font-size: 1.7rem; }
  .hero-desc { font-size: 1rem; }
  .hero-actions { flex-direction: column; }
  .dl-main-card { padding: 28px; }
  .dl-info-grid { grid-template-columns: 1fr; }
}