/* ============================================
   WPS Office Landing Site - Global Styles
   ============================================ */

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

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

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: #1d2129;
  background: #ffffff;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

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

/* ============================================
   CSS Variables
   ============================================ */
:root {
  --bg-dark: #0c1117;
  --bg-light: #ffffff;
  --bg-gray: #f0f2f5;
  --bg-card: #f7f8fa;
  --text-primary: #1d2129;
  --text-secondary: #4e5969;
  --text-muted: #86909c;
  --brand-orange: #c24f27;
  --brand-orange-light: #e06b40;
  --brand-indigo: #324065;
  --border-light: #e5e6eb;
  --border-medium: #c9cdd4;
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --shadow-orange: 0 4px 20px rgba(194,79,39,0.25);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
}

/* ============================================
   Typography
   ============================================ */
.display-title {
  font-family: 'Noto Serif SC', 'PingFang SC', 'Microsoft YaHei', serif;
  font-weight: 700;
  letter-spacing: -1.12px;
  line-height: 1.1;
}

.heading {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 600;
  letter-spacing: -0.56px;
  line-height: 1.3;
}

.body-text {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 400;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* ============================================
   Spin Animation for Download Loading
   ============================================ */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease-out forwards;
}

/* ============================================
   Navigation
   ============================================ */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--text-primary);
}

.nav-logo svg {
  width: 32px;
  height: 32px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-gray);
}

.nav-link.active {
  color: var(--brand-orange);
  background: rgba(194,79,39,0.08);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 18px;
  right: 18px;
  height: 2px;
  background: var(--brand-orange);
  border-radius: 1px;
}

.nav-cta {
  padding: 9px 22px;
  background: var(--brand-orange);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
  margin-left: 12px;
}

.nav-cta:hover {
  background: var(--brand-orange-light);
  box-shadow: var(--shadow-orange);
  transform: translateY(-1px);
}

/* ============================================
   Hero Section - Dark
   ============================================ */
.hero-section {
  position: relative;
  min-height: 100vh;
  background: var(--bg-dark);
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 64px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 50%, rgba(50,64,101,0.25) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(194,79,39,0.12) 0%, transparent 50%),
    linear-gradient(180deg, #0c1117 0%, #121a24 50%, #0c1117 100%);
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.5;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(194,79,39,0.15);
  border: 1px solid rgba(194,79,39,0.3);
  border-radius: 100px;
  font-size: 13px;
  color: var(--brand-orange-light);
  margin-bottom: 32px;
}

.hero-badge svg {
  width: 16px;
  height: 16px;
}

.hero-title {
  font-size: clamp(36px, 5vw, 64px);
  color: #ffffff;
  margin-bottom: 20px;
  max-width: 700px;
}

.hero-subtitle {
  font-size: 18px;
  color: rgba(255,255,255,0.65);
  max-width: 520px;
  margin-bottom: 40px;
  line-height: 1.7;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--brand-orange);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 600;
  transition: all 0.25s ease;
  box-shadow: 0 4px 16px rgba(194,79,39,0.35);
}

.btn-primary:hover {
  background: var(--brand-orange-light);
  box-shadow: 0 6px 24px rgba(194,79,39,0.45);
  transform: translateY(-2px);
}

.btn-primary svg {
  width: 20px;
  height: 20px;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.9);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  transition: all 0.25s ease;
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.14);
  border-color: rgba(255,255,255,0.3);
  transform: translateY(-2px);
}

.btn-secondary svg {
  width: 18px;
  height: 18px;
}

.hero-stats-bar {
  position: absolute;
  bottom: 40px;
  left: 0;
  right: 0;
  z-index: 10;
}

.hero-stats {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  gap: 48px;
}

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

.hero-stat-value {
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
}

.hero-stat-label {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin-top: 2px;
}

/* Hero floating elements */
.hero-float {
  position: absolute;
  z-index: 5;
  pointer-events: none;
}

.hero-float-doc {
  top: 18%;
  right: 8%;
  width: 280px;
  height: 200px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  padding: 20px;
  animation: float 6s ease-in-out infinite;
}

.hero-float-chart {
  top: 45%;
  right: 18%;
  width: 200px;
  height: 140px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  padding: 16px;
  animation: float 7s ease-in-out infinite 1s;
}

/* ============================================
   Section Common Styles
   ============================================ */
.section {
  padding: 100px 0;
}

.section-dark {
  background: var(--bg-dark);
  color: #fff;
}

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

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header-left {
  text-align: left;
  margin-bottom: 64px;
  max-width: 600px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  background: rgba(194,79,39,0.1);
  border: 1px solid rgba(194,79,39,0.2);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  color: var(--brand-orange);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.section-tag svg {
  width: 12px;
  height: 12px;
}

.section-title {
  font-size: clamp(28px, 3.5vw, 42px);
  color: var(--text-primary);
  margin-bottom: 16px;
}

.section-dark .section-title {
  color: #fff;
}

.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

.section-header-left .section-desc {
  margin: 0;
}

/* ============================================
   Feature Cards
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-orange), var(--brand-orange-light));
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

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

.feature-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(194,79,39,0.08);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 26px;
  height: 26px;
  color: var(--brand-orange);
}

.feature-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

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

/* ============================================
   Platform Download Section
   ============================================ */
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.platform-card {
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all 0.3s ease;
}

.platform-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--border-medium);
}

.platform-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-gray);
  border-radius: var(--radius-md);
}

.platform-icon svg {
  width: 28px;
  height: 28px;
  color: var(--text-primary);
}

.platform-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.platform-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.6;
}

.platform-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  background: var(--brand-orange);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
}

.platform-btn:hover {
  background: var(--brand-orange-light);
  box-shadow: var(--shadow-orange);
}

.platform-btn svg {
  width: 16px;
  height: 16px;
}

/* ============================================
   Product Features Detail
   ============================================ */
.detail-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 80px;
}

.detail-row:last-child {
  margin-bottom: 0;
}

.detail-row.reverse {
  direction: rtl;
}

.detail-row.reverse > * {
  direction: ltr;
}

.detail-content h3 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.detail-content p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.detail-content ul {
  margin-top: 16px;
}

.detail-content ul li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 10px;
  line-height: 1.6;
}

.detail-content ul li svg {
  width: 18px;
  height: 18px;
  color: var(--brand-orange);
  flex-shrink: 0;
  margin-top: 1px;
}

.detail-visual {
  background: linear-gradient(135deg, var(--bg-gray) 0%, #e8eaf0 100%);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
  position: relative;
  overflow: hidden;
}

.detail-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 40%, rgba(194,79,39,0.08) 0%, transparent 50%),
    radial-gradient(circle at 70% 60%, rgba(50,64,101,0.1) 0%, transparent 50%);
}

.detail-visual-inner {
  position: relative;
  z-index: 1;
  width: 100%;
}

/* ============================================
   Reviews Section
   ============================================ */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.3s ease;
}

.review-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

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

.review-stars svg {
  width: 18px;
  height: 18px;
  color: #f7ba1e;
}

.review-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-orange), var(--brand-orange-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  flex-shrink: 0;
}

.review-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.review-role {
  font-size: 12px;
  color: var(--text-muted);
}

/* ============================================
   Stats Section
   ============================================ */
.stats-section {
  background: linear-gradient(135deg, var(--brand-indigo) 0%, #1a2540 100%);
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}

.stats-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 80%, rgba(194,79,39,0.2) 0%, transparent 40%),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,0.05) 0%, transparent 40%);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
  z-index: 1;
}

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

.stat-number {
  font-size: 42px;
  font-weight: 800;
  color: #fff;
  letter-spacing: -1px;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
}

.stat-divider {
  width: 40px;
  height: 2px;
  background: var(--brand-orange);
  margin: 12px auto 0;
  border-radius: 1px;
}

/* ============================================
   Comparison Table
   ============================================ */
.comparison-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-light);
}

.comparison-table th {
  padding: 16px 24px;
  text-align: left;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-gray);
  border-bottom: 2px solid var(--border-light);
}

.comparison-table th:first-child {
  width: 35%;
}

.comparison-table td {
  padding: 16px 24px;
  font-size: 14px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-light);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table tr:hover td {
  background: rgba(194,79,39,0.02);
}

.comparison-table td svg {
  width: 20px;
  height: 20px;
  vertical-align: middle;
}

.check-yes {
  color: #00b42a;
}

.check-no {
  color: var(--text-muted);
}

/* ============================================
   FAQ Section
   ============================================ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border-light);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  transition: color 0.2s ease;
}

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

.faq-question svg {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.open .faq-question svg {
  transform: rotate(180deg);
  color: var(--brand-orange);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.open .faq-answer {
  max-height: 500px;
  padding-bottom: 24px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   Download Page Specific Styles
   ============================================ */
.download-hero {
  background: linear-gradient(135deg, var(--bg-dark) 0%, #121a24 50%, var(--brand-indigo) 100%);
  padding: 120px 0 80px;
  position: relative;
  overflow: hidden;
}

.download-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 50%, rgba(194,79,39,0.15) 0%, transparent 50%),
    radial-gradient(circle at 70% 30%, rgba(50,64,101,0.3) 0%, transparent 50%);
}

.download-hero-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 64px;
  align-items: center;
}

.download-hero-left h1 {
  font-size: clamp(32px, 4vw, 48px);
  color: #fff;
  margin-bottom: 16px;
}

.download-hero-left p {
  font-size: 17px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 32px;
  line-height: 1.7;
}

.download-meta {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
}

.download-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(255,255,255,0.6);
}

.download-meta-item svg {
  width: 16px;
  height: 16px;
  color: var(--brand-orange-light);
}

.download-btn-large {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 18px 44px;
  background: var(--brand-orange);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 18px;
  font-weight: 600;
  transition: all 0.25s ease;
  box-shadow: 0 4px 24px rgba(194,79,39,0.4);
}

.download-btn-large:hover {
  background: var(--brand-orange-light);
  box-shadow: 0 6px 32px rgba(194,79,39,0.5);
  transform: translateY(-2px);
}

.download-btn-large svg {
  width: 24px;
  height: 24px;
}

.download-hero-right {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(12px);
}

.download-hero-right h3 {
  font-size: 18px;
  color: #fff;
  margin-bottom: 20px;
  font-weight: 600;
}

.sys-req-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.sys-req-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: rgba(255,255,255,0.7);
}

.sys-req-item svg {
  width: 18px;
  height: 18px;
  color: var(--brand-orange-light);
  flex-shrink: 0;
}

/* Platform download cards */
.platform-download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.platform-download-card {
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all 0.3s ease;
}

.platform-download-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.platform-download-card .platform-icon {
  width: 60px;
  height: 60px;
  margin: 0 0 20px 0;
}

.platform-download-card .platform-icon svg {
  width: 30px;
  height: 30px;
}

.platform-download-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.platform-download-card .version-info {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.platform-download-card .install-steps {
  margin: 16px 0;
  padding: 16px;
  background: var(--bg-gray);
  border-radius: var(--radius-sm);
}

.platform-download-card .install-steps li {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  padding-left: 18px;
  position: relative;
  line-height: 1.5;
}

.platform-download-card .install-steps li::before {
  content: attr(data-step);
  position: absolute;
  left: 0;
  color: var(--brand-orange);
  font-weight: 600;
  font-size: 12px;
}

.platform-download-card .install-steps li:last-child {
  margin-bottom: 0;
}

/* Install Guide */
.guide-section {
  background: var(--bg-light);
}

.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.guide-step {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 24px;
  align-items: start;
}

.guide-step-num {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-orange), var(--brand-orange-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  flex-shrink: 0;
}

.guide-step-content h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.guide-step-content p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Changelog */
.changelog-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.changelog-item {
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  transition: all 0.2s ease;
}

.changelog-item:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-sm);
}

.changelog-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.changelog-version {
  font-size: 15px;
  font-weight: 700;
  color: var(--brand-orange);
}

.changelog-date {
  font-size: 13px;
  color: var(--text-muted);
}

.changelog-badge {
  padding: 2px 10px;
  background: rgba(194,79,39,0.1);
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
  color: var(--brand-orange);
}

.changelog-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Security notice */
.security-notice {
  background: linear-gradient(135deg, #f0f7f0 0%, #e8f5e8 100%);
  border: 1px solid #b8e0b8;
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.security-notice-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(0,180,42,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.security-notice-icon svg {
  width: 24px;
  height: 24px;
  color: #00b42a;
}

.security-notice h4 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

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

/* ============================================
   zh-cn Page Specific Styles
   ============================================ */
.seo-hero {
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--brand-indigo) 100%);
  padding: 140px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.seo-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 50%, rgba(194,79,39,0.15) 0%, transparent 50%);
}

.seo-hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
}

.seo-hero h1 {
  font-size: clamp(30px, 4vw, 44px);
  color: #fff;
  margin-bottom: 20px;
}

.seo-hero p {
  font-size: 17px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 36px;
  line-height: 1.7;
}

.seo-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 40px;
  background: var(--brand-orange);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 17px;
  font-weight: 600;
  transition: all 0.25s ease;
  box-shadow: 0 4px 24px rgba(194,79,39,0.4);
}

.seo-cta-btn:hover {
  background: var(--brand-orange-light);
  box-shadow: 0 6px 32px rgba(194,79,39,0.5);
  transform: translateY(-2px);
}

.seo-cta-btn svg {
  width: 20px;
  height: 20px;
}

.keyword-highlight {
  color: var(--brand-orange);
  font-weight: 600;
}

.seo-content h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.seo-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 32px 0 12px;
}

.seo-content p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.seo-content ul {
  margin: 12px 0 20px 20px;
  list-style: disc;
}

.seo-content ul li {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 8px;
}

.seo-features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin: 32px 0;
}

.seo-feature-card {
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
}

.seo-feature-card h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.seo-feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--bg-dark);
  padding: 60px 0 32px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand {
  max-width: 320px;
}

.footer-brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer-brand-logo svg {
  width: 32px;
  height: 32px;
}

.footer-brand p {
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: rgba(255,255,255,0.8);
  margin-bottom: 16px;
  letter-spacing: 0.3px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 14px;
  color: rgba(255,255,255,0.45);
  transition: color 0.2s ease;
}

.footer-col ul li a:hover {
  color: rgba(255,255,255,0.8);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255,255,255,0.35);
  line-height: 1.7;
  text-align: center;
}

.footer-divider {
  width: 60px;
  height: 2px;
  background: var(--brand-orange);
  margin: 0 auto 20px;
  border-radius: 1px;
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.mt-64 { margin-top: 64px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mb-48 { margin-bottom: 48px; }
.mb-64 { margin-bottom: 64px; }

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

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

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

  .detail-row.reverse {
    direction: ltr;
  }

  .download-hero-content {
    grid-template-columns: 1fr;
  }

  .platform-download-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 24px;
  }

  .features-grid,
  .reviews-grid,
  .platforms-grid,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 64px 0;
  }

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

  .btn-primary,
  .btn-secondary {
    width: 100%;
    justify-content: center;
  }

  .hero-float-doc,
  .hero-float-chart {
    display: none;
  }

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

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

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

  .guide-step-num {
    margin-bottom: 8px;
  }
}

/* Mobile nav */
.mobile-menu-btn {
  display: none;
  padding: 8px;
  background: none;
  border: none;
  color: var(--text-primary);
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-link {
    padding: 12px 16px;
    width: 100%;
  }

  .nav-cta {
    margin-left: 0;
    margin-top: 8px;
    text-align: center;
    justify-content: center;
  }
}