/* ==========================================
   TG官网 - Global Stylesheet
   ========================================== */

:root {
  --brand-blue: #2AABEE;
  --brand-dark: #1A8CD8;
  --brand-deep: #1177BB;
  --accent-cyan: #34D1BF;
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F8FC;
  --bg-dark: #0E1621;
  --text-primary: #1A1A1A;
  --text-secondary: #4A5568;
  --text-light: #718096;
  --border-color: #E2E8F0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
  --shadow-blue: 0 4px 20px rgba(42,171,238,0.25);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --max-width: 1200px;
  --nav-height: 64px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-primary);
  background: var(--bg-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; }
a { color: var(--brand-blue); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--brand-dark); }
ul { list-style: none; }
button { cursor: pointer; border: none; font-family: inherit; transition: var(--transition); }

/* Keyframes */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(42,171,238,0.4); }
  50% { box-shadow: 0 0 0 12px rgba(42,171,238,0); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Scroll animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Utility classes */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section-padding { padding: 80px 0; }
.text-center { text-align: center; }

/* ==========================================
   Navigation
   ========================================== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  display: flex;
  align-items: center;
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}
.nav-logo svg { flex-shrink: 0; }
.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-menu a {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}
.nav-menu a:hover {
  background: var(--bg-secondary);
  color: var(--brand-blue);
}
.nav-menu a.active {
  background: var(--brand-blue);
  color: #fff;
  font-weight: 600;
}
.nav-menu a.active:hover {
  background: var(--brand-dark);
  color: #fff;
}

/* Mobile nav toggle */
.nav-toggle { display: none; background: none; padding: 6px; }
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-menu {
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
    transform: translateY(-150%);
    transition: transform 0.35s ease;
    box-shadow: var(--shadow-md);
  }
  .nav-menu.open { transform: translateY(0); }
  .nav-menu a { width: 100%; justify-content: center; padding: 12px; }
  .section-padding { padding: 60px 0; }
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 80px;
  background: linear-gradient(135deg, #F0F9FF 0%, #FFFFFF 40%, #E8F4FD 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -40%; right: -15%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(42,171,238,0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -30%; left: -10%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(52,209,191,0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(42,171,238,0.1);
  color: var(--brand-blue);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--brand-deep) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin-bottom: 32px;
  line-height: 1.7;
}
.hero-btns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.hero-visual .glass-card {
  width: 100%;
  max-width: 440px;
  background: rgba(255,255,255,0.75);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.8);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: var(--shadow-lg);
  animation: float 6s ease-in-out infinite;
}
.chat-bubble {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
}
.chat-bubble:last-child { margin-bottom: 0; }
.chat-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-blue), var(--accent-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}
.chat-bubble.outgoing .chat-avatar {
  background: linear-gradient(135deg, #667EEA, #764BA2);
}
.chat-body {
  background: var(--bg-secondary);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border-top-left-radius: 4px;
  font-size: 0.9rem;
  color: var(--text-primary);
  max-width: 280px;
  box-shadow: var(--shadow-sm);
}
.chat-bubble.outgoing { flex-direction: row-reverse; }
.chat-bubble.outgoing .chat-body {
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-dark));
  color: #fff;
  border-radius: var(--radius-md);
  border-top-right-radius: 4px;
}

@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; text-align: center; }
  .hero h1 { font-size: 2.2rem; }
  .hero p { max-width: 100%; }
  .hero-btns { justify-content: center; }
  .hero-visual { order: -1; }
  .hero-visual .glass-card { max-width: 360px; }
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-dark));
  color: #fff;
  box-shadow: var(--shadow-blue);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(42,171,238,0.35);
}
.btn-outline {
  background: #fff;
  color: var(--brand-blue);
  border: 2px solid var(--brand-blue);
}
.btn-outline:hover {
  background: var(--brand-blue);
  color: #fff;
  transform: translateY(-2px);
}
.btn-lg { padding: 16px 36px; font-size: 1.05rem; }
.btn-sm { padding: 10px 20px; font-size: 0.9rem; }

/* ==========================================
   Section Headers
   ========================================== */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 60px;
}
.section-header h2 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
}
.section-header p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================
   Feature Cards
   ========================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-blue), var(--accent-cyan));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.feature-card:hover {
  border-color: rgba(42,171,238,0.3);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.feature-card:hover::before {
  transform: scaleX(1);
}
.feature-icon {
  width: 56px; height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(42,171,238,0.1), rgba(52,209,191,0.1));
  color: var(--brand-blue);
  margin-bottom: 20px;
}
.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}
.feature-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

@media (max-width: 960px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .features-grid { grid-template-columns: 1fr; }
  .section-header h2 { font-size: 1.7rem; }
}

/* ==========================================
   Download Section (Home)
   ========================================== */
.download-section { background: var(--bg-secondary); }
.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.platform-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(42,171,238,0.25);
}
.platform-icon {
  width: 64px; height: 64px;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
}
.platform-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.platform-card p {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 18px;
  min-height: 40px;
}

@media (max-width: 960px) {
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .platform-grid { grid-template-columns: 1fr; }
}

/* ==========================================
   Detailed Feature Section
   ========================================== */
.detail-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}
.detail-row:last-child { margin-bottom: 0; }
.detail-row.reverse { direction: rtl; }
.detail-row.reverse > * { direction: ltr; }
.detail-visual {
  background: linear-gradient(135deg, #E8F4FD, #F0F9FF);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  position: relative;
  overflow: hidden;
}
.detail-visual::before {
  content: '';
  position: absolute;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(42,171,238,0.1), transparent 70%);
  border-radius: 50%;
}
.detail-text h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
}
.detail-text p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
}
.detail-list {
  margin-top: 16px;
}
.detail-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}
.detail-list li svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--brand-blue);
}

@media (max-width: 960px) {
  .detail-row { grid-template-columns: 1fr; gap: 30px; margin-bottom: 60px; }
  .detail-row.reverse { direction: ltr; }
  .detail-visual { order: -1; min-height: 220px; }
}

/* ==========================================
   Reviews
   ========================================== */
.reviews-section { background: var(--bg-secondary); }
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.review-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.review-stars {
  display: flex;
  gap: 3px;
  margin-bottom: 14px;
  color: #F6B73C;
}
.review-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.review-avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-blue), var(--accent-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
}
.review-author-info strong {
  display: block;
  font-size: 0.9rem;
  color: var(--text-primary);
}
.review-author-info span {
  font-size: 0.8rem;
  color: var(--text-light);
}

@media (max-width: 960px) {
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .reviews-grid { grid-template-columns: 1fr; }
}

/* ==========================================
   Stats
   ========================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stat-card {
  text-align: center;
  padding: 32px 20px;
  background: linear-gradient(135deg, #fff, #F5F8FC);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-deep));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 0.88rem;
  color: var(--text-secondary);
  font-weight: 500;
}

@media (max-width: 960px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ==========================================
   Comparison Table
   ========================================== */
.compare-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.compare-table th {
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-dark));
  color: #fff;
  padding: 16px 20px;
  text-align: left;
  font-weight: 600;
}
.compare-table th:first-child { border-radius: var(--radius-lg) 0 0 0; }
.compare-table th:last-child { border-radius: 0 var(--radius-lg) 0 0; }
.compare-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table tr:nth-child(even) { background: var(--bg-secondary); }
.compare-table td:first-child { font-weight: 600; color: var(--text-primary); }
.compare-yes { color: #10B981; display: inline-flex; align-items: center; gap: 6px; font-weight: 600; }
.compare-no { color: #EF4444; display: inline-flex; align-items: center; gap: 6px; font-weight: 600; }
.compare-partial { color: #F59E0B; display: inline-flex; align-items: center; gap: 6px; font-weight: 600; }

/* ==========================================
   FAQ
   ========================================== */
.faq-section { background: var(--bg-secondary); }
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  background: #fff;
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover {
  box-shadow: var(--shadow-sm);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  user-select: none;
}
.faq-question svg {
  flex-shrink: 0;
  transition: transform 0.3s ease;
  color: var(--brand-blue);
}
.faq-item.active .faq-question svg {
  transform: rotate(180deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 24px;
}
.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 24px 20px;
}
.faq-answer p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  background: var(--bg-dark);
  color: #A0AEC0;
  padding: 50px 0 30px;
}
.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}
.footer-desc {
  font-size: 0.88rem;
  line-height: 1.7;
  color: #94A3B8;
}
.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 18px;
}
.footer-col a {
  display: block;
  color: #94A3B8;
  font-size: 0.88rem;
  margin-bottom: 10px;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--brand-blue); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  text-align: center;
  font-size: 0.82rem;
  color: #64748B;
  line-height: 1.8;
}
.footer-bottom strong {
  color: #10B981;
  display: block;
  margin-bottom: 8px;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .footer-content { grid-template-columns: 1fr 1fr; gap: 30px; }
}
@media (max-width: 480px) {
  .footer-content { grid-template-columns: 1fr; }
}

/* ==========================================
   Download Page Specific Styles
   ========================================== */
.download-hero {
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 70px;
  background: linear-gradient(135deg, #E8F4FD 0%, #F5F8FC 50%, #FFFFFF 100%);
  text-align: center;
}
.download-hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary), var(--brand-deep));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.download-hero p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 32px;
}

/* Main Windows download card */
.main-download {
  background: #fff;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  padding: 48px;
  max-width: 720px;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
  text-align: center;
}
.main-download .win-icon {
  width: 80px; height: 80px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(42,171,238,0.12), rgba(52,209,191,0.12));
  color: var(--brand-blue);
}
.main-download h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.main-download .meta {
  font-size: 0.88rem;
  color: var(--text-light);
  margin-bottom: 24px;
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}
.main-download .meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Platform download cards */
.download-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.dl-card {
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 32px;
  transition: var(--transition);
}
.dl-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(42,171,238,0.25);
}
.dl-card .platform-icon {
  width: 56px; height: 56px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
}
.dl-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 6px;
}
.dl-card .version {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-light);
  margin-bottom: 16px;
}
.dl-card .requirements {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 18px;
  text-align: center;
}
.dl-card .steps {
  margin-bottom: 18px;
}
.dl-card .steps li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.dl-card .steps .step-num {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--brand-blue);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

@media (max-width: 960px) {
  .download-cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .download-cards { grid-template-columns: 1fr; }
  .main-download { padding: 32px 24px; }
}

/* Installation guide */
.install-guide {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.install-step {
  display: flex;
  gap: 20px;
  margin-bottom: 28px;
  position: relative;
}
.install-step:last-child { margin-bottom: 0; }
.install-step::before {
  content: '';
  position: absolute;
  left: 22px; top: 48px; bottom: -20px;
  width: 2px;
  background: var(--border-color);
}
.install-step:last-child::before { display: none; }
.step-badge {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-dark));
  color: #fff;
  font-weight: 800;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}
.install-step h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}
.install-step p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* System requirements table */
.req-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
}
.req-table th {
  background: var(--bg-secondary);
  padding: 14px 18px;
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
}
.req-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}
.req-table tr:last-child td { border-bottom: none; }

/* Changelog */
.changelog-item {
  padding: 22px 0;
  border-bottom: 1px solid var(--border-color);
}
.changelog-item:last-child { border-bottom: none; }
.changelog-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 10px;
}
.changelog-version {
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-dark));
  color: #fff;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 700;
}
.changelog-date {
  font-size: 0.85rem;
  color: var(--text-light);
}
.changelog-item ul {
  padding-left: 18px;
}
.changelog-item ul li {
  list-style: disc;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
  line-height: 1.6;
}

/* Download FAQ */
.dl-faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.dl-faq-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.dl-faq-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: rgba(42,171,238,0.2);
}
.dl-faq-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}
.dl-faq-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

@media (max-width: 768px) {
  .dl-faq-grid { grid-template-columns: 1fr; }
}

/* Security note */
.security-note {
  background: linear-gradient(135deg, #ECFDF5, #F0FDF4);
  border: 1px solid #A7F3D0;
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.security-note .icon {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: #10B981;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.security-note h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #065F46;
  margin-bottom: 6px;
}
.security-note p {
  font-size: 0.92rem;
  color: #047857;
  line-height: 1.7;
}

/* ==========================================
   zh-cn Page Specific Styles
   ========================================== */
.seo-hero {
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 60px;
  background: linear-gradient(135deg, #E8F4FD, #FFFFFF, #F0F9FF);
  text-align: center;
}
.seo-hero h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
}
.seo-hero p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 28px;
}
.seo-content { max-width: 800px; margin: 0 auto; }
.seo-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 40px 0 16px;
  color: var(--text-primary);
}
.seo-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--text-primary);
}
.seo-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 14px;
}
.seo-content ul {
  padding-left: 22px;
  margin-bottom: 16px;
}
.seo-content ul li {
  list-style: disc;
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  line-height: 1.7;
}
.seo-tips {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 24px 0;
}
.seo-tips h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
}
.seo-cta {
  text-align: center;
  padding: 40px 0;
}
.seo-cta p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

/* ==========================================
   Misc
   ========================================== */
.highlight-box {
  background: linear-gradient(135deg, rgba(42,171,238,0.05), rgba(52,209,191,0.05));
  border-left: 4px solid var(--brand-blue);
  padding: 18px 22px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 18px 0;
}
.highlight-box p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Breadcrumb for SEO */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-light);
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--brand-blue); }