/* ============================================
   TG中文版 安全下载站 - 全局样式
   ============================================ */

/* CSS 变量 */
:root {
  --primary: #0088cc;
  --primary-dark: #006699;
  --primary-light: #e6f4fa;
  --secondary: #24a1de;
  --accent: #ff6b35;
  --success: #34c759;
  --warning: #ff9500;
  --text-primary: #1a1a1a;
  --text-secondary: #5a5a5a;
  --text-muted: #8a8a8a;
  --bg-white: #ffffff;
  --bg-light: #f5f7fa;
  --bg-dark: #1a1d21;
  --bg-card: #ffffff;
  --border-color: #e4e8ec;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.14);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 重置与基础 */
*, *::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, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary-dark);
}

ul, ol {
  list-style: none;
}

/* ============================================
   加载动画
   ============================================ */
@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 fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

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

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

@keyframes countUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fadeInUp {
  animation: fadeInUp 0.7s ease-out forwards;
}

.animate-fadeIn {
  animation: fadeIn 0.5s ease-out forwards;
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

.navbar-brand:hover {
  color: var(--primary);
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-item {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

.nav-item:hover {
  color: var(--primary);
  background: var(--primary-light);
}

.nav-item.active {
  color: var(--primary);
  background: var(--primary-light);
  font-weight: 600;
}

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

.navbar-mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

/* ============================================
   按钮
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  line-height: 1.5;
}

.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  box-shadow: 0 4px 14px rgba(0,136,204,0.35);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(0,136,204,0.45);
  transform: translateY(-1px);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-light);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), #ff8c5a);
  color: #fff;
  box-shadow: 0 4px 14px rgba(255,107,53,0.35);
}

.btn-accent:hover {
  box-shadow: 0 6px 20px rgba(255,107,53,0.45);
  transform: translateY(-1px);
  color: #fff;
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.125rem;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.875rem;
}

/* ============================================
   容器与布局
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

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

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

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

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-label {
  display: inline-block;
  padding: 4px 14px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: 100px;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   网格系统
   ============================================ */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

/* ============================================
   卡片
   ============================================ */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 32px;
  transition: var(--transition);
}

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

.card-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.card-icon svg {
  width: 26px;
  height: 26px;
  color: var(--primary);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.card-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
  padding: 140px 0 100px;
  background: linear-gradient(160deg, var(--primary-light) 0%, var(--bg-white) 50%, var(--bg-light) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,136,204,0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(0,136,204,0.1);
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero-badge svg {
  width: 18px;
  height: 18px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.hero-title span {
  color: var(--primary);
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 520px;
  line-height: 1.8;
}

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

.hero-meta {
  display: flex;
  gap: 32px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--border-color);
}

.hero-meta-item {
  display: flex;
  flex-direction: column;
}

.hero-meta-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.hero-meta-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-visual-inner {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 24px 60px rgba(0,136,204,0.25);
  position: relative;
}

.hero-visual-inner::before {
  content: '';
  position: absolute;
  inset: 20px;
  border: 2px dashed rgba(255,255,255,0.2);
  border-radius: 18px;
}

.hero-visual-icon {
  width: 140px;
  height: 140px;
  color: #fff;
  opacity: 0.95;
}

/* 浮动装饰元素 */
.hero-deco {
  position: absolute;
  background: #fff;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.hero-deco svg {
  width: 22px;
  height: 22px;
  color: var(--success);
}

.hero-deco-1 { top: 10%; left: -10px; animation: float 4s ease-in-out infinite; }
.hero-deco-2 { bottom: 15%; right: -10px; animation: float 3.5s ease-in-out infinite 0.5s; }
.hero-deco-3 { top: 50%; left: -20px; animation: float 4.5s ease-in-out infinite 1s; }

/* ============================================
   平台下载区域
   ============================================ */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

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

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

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

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

.platform-name {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.platform-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* ============================================
   功能详情区
   ============================================ */
.feature-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}

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

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

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

.feature-detail-visual {
  background: var(--bg-light);
  border-radius: var(--radius-xl);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
}

.feature-detail-visual svg {
  width: 160px;
  height: 160px;
  color: var(--primary);
}

.feature-detail-content h3 {
  font-size: 1.625rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.feature-detail-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

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

.feature-detail-content li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.feature-detail-content li svg {
  width: 20px;
  height: 20px;
  color: var(--success);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ============================================
   用户评价
   ============================================ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 28px;
  transition: var(--transition);
}

.review-card:hover {
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.review-stars {
  display: flex;
  gap: 3px;
  margin-bottom: 16px;
}

.review-stars svg {
  width: 18px;
  height: 18px;
  color: var(--warning);
}

.review-text {
  font-size: 0.9375rem;
  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(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.875rem;
}

.review-name {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text-primary);
}

.review-role {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ============================================
   数据统计
   ============================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-card {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  text-align: center;
  transition: var(--transition);
}

.stat-card:hover {
  background: rgba(255,255,255,0.12);
  transform: translateY(-3px);
}

.stat-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
}

.stat-icon svg {
  width: 24px;
  height: 24px;
  color: var(--secondary);
}

.stat-value {
  font-size: 2.25rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
}

/* ============================================
   对比表格
   ============================================ */
.compare-table-wrap {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
}

.compare-table th,
.compare-table td {
  padding: 18px 24px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.compare-table th {
  background: var(--bg-light);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.compare-table td {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.compare-table td:first-child {
  font-weight: 600;
  color: var(--text-primary);
}

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

.compare-table .check svg {
  width: 20px;
  height: 20px;
  color: var(--success);
}

.compare-table .cross svg {
  width: 20px;
  height: 20px;
  color: #e74c3c;
}

.compare-table .partial {
  color: var(--warning);
  font-weight: 500;
}

/* ============================================
   FAQ
   ============================================ */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--primary);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: var(--transition);
}

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

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

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

.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;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ============================================
   CTA 区域
   ============================================ */
.cta-section {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  padding: 80px 0;
  text-align: center;
  color: #fff;
}

.cta-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 1.0625rem;
  opacity: 0.9;
  max-width: 520px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.cta-btn {
  background: #fff;
  color: var(--primary);
  font-weight: 700;
  padding: 16px 40px;
  border-radius: var(--radius-lg);
  font-size: 1.0625rem;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
  color: var(--primary-dark);
}

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

/* ============================================
   下载页专属样式
   ============================================ */
.download-hero {
  padding: 140px 0 60px;
  background: linear-gradient(160deg, var(--primary-light) 0%, var(--bg-white) 60%);
}

.download-hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
}

.download-main-card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  padding: 48px;
  box-shadow: var(--shadow-lg);
}

.download-main-card .platform-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: 100px;
  margin-bottom: 20px;
}

.download-main-card .platform-tag svg {
  width: 16px;
  height: 16px;
}

.download-main-card h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.download-version {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.download-info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 24px 0;
  padding: 20px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.download-info-item {
  text-align: center;
}

.download-info-value {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.download-info-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.download-requirements {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.download-requirements strong {
  color: var(--text-secondary);
}

.platform-download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.platform-download-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 32px;
  transition: var(--transition);
}

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

.platform-download-card .platform-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
}

.platform-download-card .platform-icon svg {
  width: 26px;
  height: 26px;
}

.platform-download-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.platform-download-card .version {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.platform-download-card .install-steps {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin: 12px 0 0;
  padding-left: 16px;
}

.platform-download-card .install-steps li {
  list-style: decimal;
  margin-bottom: 4px;
  line-height: 1.6;
}

/* 安装指南 */
.guide-section {
  background: var(--bg-light);
}

.guide-step {
  display: flex;
  gap: 24px;
  margin-bottom: 40px;
}

.guide-step:last-child {
  margin-bottom: 0;
}

.guide-step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  flex-shrink: 0;
}

.guide-step-content h4 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
  margin-top: 10px;
}

.guide-step-content p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.guide-step-content ul {
  margin-top: 8px;
  padding-left: 20px;
}

.guide-step-content ul li {
  list-style: disc;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

/* 系统要求表格 */
.sysreq-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.sysreq-table th,
.sysreq-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.9375rem;
}

.sysreq-table th {
  background: var(--bg-light);
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sysreq-table td:first-child {
  font-weight: 600;
  color: var(--text-primary);
}

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

/* 更新日志 */
.changelog-list {
  max-width: 900px;
  margin: 0 auto;
}

.changelog-item {
  display: flex;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border-color);
}

.changelog-item:last-child {
  border-bottom: none;
}

.changelog-version {
  flex-shrink: 0;
  width: 100px;
}

.changelog-version .ver-num {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--primary);
}

.changelog-version .ver-date {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.changelog-content h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.changelog-content ul {
  padding-left: 18px;
}

.changelog-content li {
  list-style: disc;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
  line-height: 1.6;
}

/* 安全下载 */
.security-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.security-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 32px;
  text-align: center;
  transition: var(--transition);
}

.security-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.security-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: 50%;
}

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

.security-card h4 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.security-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   SEO页专属样式
   ============================================ */
.article-section {
  padding: 120px 0 80px;
}

.article-content {
  max-width: 800px;
  margin: 0 auto;
}

.article-content h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 24px;
  line-height: 1.4;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 48px 0 16px;
  color: var(--text-primary);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 32px 0 12px;
  color: var(--text-primary);
}

.article-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.article-content ul {
  padding-left: 24px;
  margin-bottom: 16px;
}

.article-content ul li {
  list-style: disc;
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 6px;
}

.article-content ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.article-content ol li {
  list-style: decimal;
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 6px;
}

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

.article-content a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-content blockquote {
  background: var(--bg-light);
  border-left: 4px solid var(--primary);
  padding: 20px 24px;
  margin: 24px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.article-content blockquote p {
  margin: 0;
  font-style: italic;
  color: var(--text-secondary);
}

.article-cta-box {
  background: linear-gradient(135deg, var(--primary-light), #fff);
  border: 2px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
  margin: 48px 0;
}

.article-cta-box h3 {
  font-size: 1.375rem;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--text-primary);
}

.article-cta-box p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

/* ============================================
   页脚
   ============================================ */
.footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 48px 0 32px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.footer-brand svg {
  width: 28px;
  height: 28px;
}

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.5);
}

.footer-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

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

.footer-links a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.55);
  transition: var(--transition);
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  padding-top: 24px;
  text-align: center;
}

.footer-disclaimer {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.4);
  line-height: 1.7;
}

.footer-disclaimer .safe-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--success);
  font-weight: 600;
  margin-bottom: 8px;
}

.footer-disclaimer .safe-badge svg {
  width: 16px;
  height: 16px;
}

/* ============================================
   面包屑
   ============================================ */
.breadcrumb {
  padding: 100px 0 20px;
  background: var(--bg-light);
}

.breadcrumb-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.breadcrumb-list a {
  color: var(--text-secondary);
}

.breadcrumb-list a:hover {
  color: var(--primary);
}

.breadcrumb-sep {
  color: var(--text-muted);
}

/* ============================================
   面包屑与移动端
   ============================================ */
.mobile-menu {
  display: none;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 24px;
  box-shadow: var(--shadow-md);
}

.mobile-menu.open {
  display: block;
}

.mobile-menu .nav-item {
  display: block;
  padding: 12px 16px;
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .hero-meta {
    justify-content: center;
  }
  
  .hero-visual {
    order: -1;
  }
  
  .hero-visual-inner {
    max-width: 360px;
  }
  
  .feature-detail {
    grid-template-columns: 1fr;
  }
  
  .feature-detail.reverse {
    direction: ltr;
  }
  
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  
  .download-hero-inner {
    grid-template-columns: 1fr;
  }
  
  .platform-download-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 56px 0;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .hero {
    padding: 120px 0 60px;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .hero-meta {
    gap: 20px;
  }
  
  .grid-2, .grid-3, .grid-4, .grid-6,
  .platform-grid, .review-grid, .stats-grid,
  .security-grid {
    grid-template-columns: 1fr;
  }
  
  .navbar-nav {
    display: none;
  }
  
  .navbar-mobile-toggle {
    display: block;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .download-main-card {
    padding: 28px;
  }
  
  .download-info-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .guide-step {
    flex-direction: column;
    gap: 12px;
  }
  
  .changelog-item {
    flex-direction: column;
    gap: 8px;
  }
  
  .article-content h1 {
    font-size: 1.625rem;
  }
  
  .article-content h2 {
    font-size: 1.25rem;
  }
}

/* ============================================
   SEO 辅助
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}