/* ============================================================
   Telegram 官网模板 V2 - 深色科技风 + 玻璃拟态
   符合谷歌SEO / GEO 标准
   ============================================================ */

/* ---- Google Fonts 引入 ---- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ---- CSS 变量 ---- */
:root {
  /* 主色系 */
  --tg-blue: #2AABEE;
  --tg-blue-light: #5ec8f5;
  --tg-blue-dark: #0d8fd4;
  --tg-purple: #7B5EA7;
  --tg-cyan: #00d4ff;

  /* 深色背景 */
  --bg-primary: #0a0e1a;
  --bg-secondary: #0f1628;
  --bg-card: #141c2e;
  --bg-card-hover: #1a2440;
  --bg-glass: rgba(20, 28, 46, 0.7);
  --bg-glass-light: rgba(42, 171, 238, 0.06);

  /* 文字颜色 */
  --text-primary: #e8f0fe;
  --text-secondary: #8fa3c0;
  --text-muted: #5a7090;
  --text-white: #ffffff;

  /* 边框 */
  --border-color: rgba(42, 171, 238, 0.15);
  --border-glow: rgba(42, 171, 238, 0.4);

  /* 渐变 */
  --grad-blue: linear-gradient(135deg, #2AABEE, #0d8fd4);
  --grad-hero: linear-gradient(135deg, #0a0e1a 0%, #0f1628 50%, #0a1628 100%);
  --grad-card: linear-gradient(145deg, #141c2e, #0f1628);
  --grad-glow: radial-gradient(ellipse at center, rgba(42,171,238,0.15) 0%, transparent 70%);

  /* 阴影 */
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4), 0 1px 0 rgba(42,171,238,0.1);
  --shadow-hover: 0 8px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(42,171,238,0.2);
  --shadow-glow: 0 0 30px rgba(42,171,238,0.2);
  --shadow-btn: 0 4px 20px rgba(42,171,238,0.4);

  /* 圆角 */
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;

  /* 字体 */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* ---- 重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--tg-blue); text-decoration: none; transition: color .2s; }
a:hover { color: var(--tg-blue-light); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ---- 容器 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 28px; }
.container-sm { max-width: 880px; margin: 0 auto; padding: 0 28px; }

/* ---- 背景网格装饰 ---- */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    linear-gradient(rgba(42,171,238,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42,171,238,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* ============================================================
   顶部导航
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--text-white);
  letter-spacing: -0.3px;
}
.site-logo img {
  width: 38px; height: 38px;
  border-radius: 10px;
  box-shadow: 0 0 16px rgba(42,171,238,0.4);
}
.site-logo .brand-name { color: var(--text-white); }
.site-logo .brand-tag {
  background: var(--grad-blue);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 主导航 */
.main-nav { display: flex; align-items: center; gap: 2px; }
.main-nav a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all .2s;
  position: relative;
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--tg-blue);
  background: var(--bg-glass-light);
  text-decoration: none;
}
.main-nav a.active::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%;
  transform: translateX(-50%);
  width: 20px; height: 2px;
  background: var(--tg-blue);
  border-radius: 2px;
}

/* 右侧操作 */
.header-actions { display: flex; align-items: center; gap: 12px; }
.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--grad-blue);
  color: #fff !important;
  padding: 9px 20px;
  border-radius: 24px;
  font-size: 0.875rem;
  font-weight: 700;
  transition: all .2s;
  text-decoration: none !important;
  box-shadow: var(--shadow-btn);
  letter-spacing: 0.2px;
}
.btn-download:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(42,171,238,0.5); }

/* 汉堡菜单 */
.menu-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.menu-toggle span { display: block; width: 24px; height: 2px; background: var(--text-secondary); border-radius: 2px; transition: all .3s; }

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 0;
  font-size: 0.85rem;
}
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.breadcrumb li { display: flex; align-items: center; gap: 6px; color: var(--text-muted); }
.breadcrumb li + li::before { content: "/"; color: var(--text-muted); font-size: 0.8rem; }
.breadcrumb a { color: var(--tg-blue); }
.breadcrumb a:hover { color: var(--tg-blue-light); }
.breadcrumb li:last-child { color: var(--text-secondary); }

/* ============================================================
   通用按钮
   ============================================================ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--grad-blue);
  color: #fff;
  padding: 14px 32px;
  border-radius: 32px;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  transition: all .25s;
  box-shadow: var(--shadow-btn);
  letter-spacing: 0.3px;
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transition: left .5s;
}
.btn-primary:hover::before { left: 100%; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 36px rgba(42,171,238,0.5); color: #fff; text-decoration: none; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--tg-blue);
  padding: 13px 30px;
  border-radius: 32px;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  border: 1.5px solid var(--border-glow);
  transition: all .25s;
  backdrop-filter: blur(10px);
}
.btn-secondary:hover { background: var(--bg-glass-light); border-color: var(--tg-blue); transform: translateY(-2px); text-decoration: none; color: var(--tg-blue-light); }

/* ============================================================
   Section 通用样式
   ============================================================ */
.section-header { text-align: center; margin-bottom: 56px; }
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-color);
  color: var(--tg-blue);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}
.section-title .grad-text {
  background: linear-gradient(135deg, var(--tg-blue), var(--tg-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc { font-size: 1rem; color: var(--text-secondary); max-width: 560px; margin: 0 auto; line-height: 1.8; }

/* ============================================================
   Hero 区域
   ============================================================ */
.hero-section {
  position: relative;
  padding: 100px 0 80px;
  text-align: center;
  overflow: hidden;
  background: var(--grad-hero);
  z-index: 1;
}
/* 光晕装饰 */
.hero-section::before {
  content: '';
  position: absolute;
  top: -100px; left: 50%;
  transform: translateX(-50%);
  width: 800px; height: 600px;
  background: radial-gradient(ellipse, rgba(42,171,238,0.12) 0%, transparent 65%);
  pointer-events: none;
}
.hero-section::after {
  content: '';
  position: absolute;
  bottom: -60px; right: -100px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(123,94,167,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  color: var(--tg-blue);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 7px 18px;
  border-radius: 24px;
  margin-bottom: 28px;
  letter-spacing: 0.5px;
}
.hero-badge .dot { width: 7px; height: 7px; background: #22c55e; border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.6;transform:scale(1.3)} }

.hero-logo-wrap {
  position: relative;
  display: inline-block;
  margin-bottom: 32px;
}
.hero-logo {
  width: 96px; height: 96px;
  border-radius: 24px;
  box-shadow: 0 0 0 1px rgba(42,171,238,0.3), 0 0 60px rgba(42,171,238,0.25), 0 20px 40px rgba(0,0,0,0.4);
}
.hero-logo-ring {
  position: absolute;
  top: -8px; left: -8px; right: -8px; bottom: -8px;
  border-radius: 32px;
  border: 1px solid rgba(42,171,238,0.2);
  animation: ring-rotate 8s linear infinite;
}
@keyframes ring-rotate { from{transform:rotate(0deg)} to{transform:rotate(360deg)} }

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  color: var(--text-white);
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-title .grad-text {
  background: linear-gradient(135deg, #2AABEE 0%, #00d4ff 50%, #7B5EA7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 44px;
  line-height: 1.8;
}
.hero-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; margin-bottom: 60px; }

/* 平台徽标行 */
.hero-platforms {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.platform-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  padding: 8px 16px;
  border-radius: 12px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: all .2s;
  text-decoration: none;
}
.platform-badge:hover { border-color: var(--tg-blue); color: var(--tg-blue); background: var(--bg-glass-light); text-decoration: none; }
.platform-badge .icon { font-size: 1rem; }

/* ============================================================
   轮播区
   ============================================================ */
.carousel-section {
  padding: 0 0 80px;
  position: relative;
  z-index: 1;
}
.carousel-wrapper {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card);
}
.carousel-track { display: flex; transition: transform .6s cubic-bezier(0.4,0,0.2,1); }
.carousel-slide { min-width: 100%; position: relative; }
.carousel-slide-inner {
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  position: relative;
  overflow: hidden;
}
.carousel-slide-inner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-hero);
}
.carousel-slide-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: #fff;
  max-width: 600px;
}
.carousel-slide-icon { font-size: 4rem; margin-bottom: 20px; filter: drop-shadow(0 0 20px rgba(42,171,238,0.5)); }
.carousel-slide-content h3 { font-size: 1.7rem; font-weight: 800; margin-bottom: 12px; letter-spacing: -0.3px; }
.carousel-slide-content p { font-size: 1rem; color: rgba(255,255,255,0.75); margin-bottom: 24px; line-height: 1.7; }
.carousel-slide-content a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  backdrop-filter: blur(10px);
  color: #fff;
  padding: 10px 24px;
  border-radius: 24px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: all .2s;
}
.carousel-slide-content a:hover { background: rgba(255,255,255,0.22); color: #fff; }

/* 轮播控制 */
.carousel-controls { display: flex; justify-content: center; gap: 8px; margin-top: 20px; }
.carousel-dot {
  width: 8px; height: 8px;
  border-radius: 4px;
  background: var(--border-color);
  cursor: pointer;
  transition: all .3s;
  border: none;
}
.carousel-dot.active { background: var(--tg-blue); width: 24px; box-shadow: 0 0 10px rgba(42,171,238,0.5); }
.carousel-btn {
  position: absolute;
  top: 50%; transform: translateY(-50%);
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  width: 44px; height: 44px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--tg-blue);
  transition: all .2s;
  z-index: 10;
  display: flex; align-items: center; justify-content: center;
}
.carousel-btn:hover { background: var(--bg-glass-light); border-color: var(--tg-blue); }
.carousel-btn.prev { left: 16px; }
.carousel-btn.next { right: 16px; }

/* ============================================================
   数据统计
   ============================================================ */
.stats-section {
  padding: 60px 0;
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.stat-item {
  text-align: center;
  padding: 20px;
  position: relative;
}
.stat-item + .stat-item::before {
  content: '';
  position: absolute;
  left: 0; top: 20%; bottom: 20%;
  width: 1px;
  background: var(--border-color);
}
.stat-num {
  font-size: 2.6rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--tg-blue), var(--tg-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
  letter-spacing: -1px;
}
.stat-label { font-size: 0.875rem; color: var(--text-muted); font-weight: 500; }

/* ============================================================
   特性卡片
   ============================================================ */
.features-section { padding: 100px 0; position: relative; z-index: 1; }
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all .3s;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--grad-blue);
  transform: scaleX(0);
  transition: transform .3s;
  transform-origin: left;
}
.feature-card:hover { border-color: var(--border-glow); box-shadow: var(--shadow-hover); transform: translateY(-4px); background: var(--bg-card-hover); }
.feature-card:hover::before { transform: scaleX(1); }

.feature-icon-wrap {
  width: 52px; height: 52px;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  transition: all .3s;
}
.feature-card:hover .feature-icon-wrap { border-color: var(--border-glow); box-shadow: 0 0 20px rgba(42,171,238,0.15); }
.feature-card h3 { font-size: 1.05rem; font-weight: 700; color: var(--text-white); margin-bottom: 10px; }
.feature-card p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.7; }
.feature-card .learn-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--tg-blue);
  font-size: 0.82rem;
  font-weight: 600;
  margin-top: 16px;
  opacity: 0;
  transition: opacity .3s;
}
.feature-card:hover .learn-more { opacity: 1; }

/* ============================================================
   下载区域
   ============================================================ */
.download-section { padding: 100px 0; background: var(--bg-secondary); position: relative; z-index: 1; }
.download-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 48px;
}
.download-card {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: all .3s;
  text-decoration: none;
  color: var(--text-primary);
  position: relative;
  overflow: hidden;
}
.download-card::after {
  content: '';
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: 3px;
  background: var(--grad-blue);
  transform: scaleY(0);
  transition: transform .3s;
  transform-origin: bottom;
}
.download-card:hover { border-color: var(--border-glow); box-shadow: var(--shadow-hover); transform: translateX(4px); text-decoration: none; color: var(--text-primary); }
.download-card:hover::after { transform: scaleY(1); }
.download-card-icon {
  width: 52px; height: 52px;
  background: var(--grad-blue);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
  box-shadow: 0 4px 16px rgba(42,171,238,0.3);
}
.download-card-info h3 { font-size: 1rem; font-weight: 700; color: var(--text-white); margin-bottom: 4px; }
.download-card-info p { font-size: 0.82rem; color: var(--text-secondary); }
.download-card-meta { display: flex; gap: 6px; margin-top: 6px; }
.download-card-meta span {
  font-size: 0.72rem;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: 4px;
}
.download-card-arrow { margin-left: auto; color: var(--tg-blue); font-size: 1.1rem; opacity: 0; transition: opacity .3s; }
.download-card:hover .download-card-arrow { opacity: 1; }

/* ============================================================
   新闻/文章列表
   ============================================================ */
.news-section { padding: 100px 0; position: relative; z-index: 1; }
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all .3s;
  display: flex;
  flex-direction: column;
}
.news-card:hover { border-color: var(--border-glow); box-shadow: var(--shadow-hover); transform: translateY(-6px); }
.news-card-thumb-wrap {
  position: relative;
  overflow: hidden;
  height: 190px;
}
.news-card-thumb {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .4s;
}
.news-card:hover .news-card-thumb { transform: scale(1.05); }
.news-card-thumb-placeholder {
  width: 100%; height: 190px;
  background: linear-gradient(135deg, var(--bg-card-hover), var(--bg-secondary));
  display: flex; align-items: center; justify-content: center;
  font-size: 2.5rem;
  position: relative;
}
.news-card-thumb-placeholder::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(42,171,238,0.05), rgba(123,94,167,0.05));
}
.news-card-body { padding: 22px; flex: 1; display: flex; flex-direction: column; }
.news-card-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.news-card-cat {
  background: var(--bg-glass-light);
  border: 1px solid var(--border-color);
  color: var(--tg-blue);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}
.news-card-date { font-size: 0.78rem; color: var(--text-muted); }
.news-card-title {
  font-size: 0.975rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 10px;
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card-title a { color: var(--text-white); }
.news-card-title a:hover { color: var(--tg-blue); }
.news-card-excerpt { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.65; flex: 1; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.news-card-footer { padding: 14px 22px; border-top: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; }
.read-more { font-size: 0.82rem; color: var(--tg-blue); font-weight: 600; display: flex; align-items: center; gap: 4px; }
.read-more:hover { color: var(--tg-blue-light); }
.news-card-views { font-size: 0.78rem; color: var(--text-muted); }

/* ============================================================
   列表页
   ============================================================ */
.page-title-bar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 48px 0;
  position: relative;
  overflow: hidden;
}
.page-title-bar::before {
  content: '';
  position: absolute;
  top: -60px; right: -60px;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(42,171,238,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.page-title-bar h1 { font-size: 1.9rem; font-weight: 800; color: var(--text-white); margin-bottom: 8px; letter-spacing: -0.5px; }
.page-title-bar p { font-size: 0.95rem; color: var(--text-secondary); }

.list-layout { display: grid; grid-template-columns: 1fr 300px; gap: 32px; padding: 48px 0; }

.article-list { display: flex; flex-direction: column; gap: 16px; }
.article-item {
  display: flex;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  transition: all .3s;
}
.article-item:hover { border-color: var(--border-glow); box-shadow: var(--shadow-hover); transform: translateX(4px); }
.article-item-thumb {
  width: 140px; height: 100px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.article-item-thumb-placeholder {
  width: 140px; height: 100px;
  background: linear-gradient(135deg, var(--bg-card-hover), var(--bg-secondary));
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
  border: 1px solid var(--border-color);
}
.article-item-body { flex: 1; }
.article-item-meta { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.article-item-cat { background: var(--bg-glass-light); border: 1px solid var(--border-color); color: var(--tg-blue); font-size: 0.72rem; font-weight: 700; padding: 3px 10px; border-radius: 20px; text-transform: uppercase; letter-spacing: 0.3px; }
.article-item-date { font-size: 0.78rem; color: var(--text-muted); }
.article-item-views { font-size: 0.78rem; color: var(--text-muted); }
.article-item-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.article-item-title a { color: var(--text-white); }
.article-item-title a:hover { color: var(--tg-blue); }
.article-item-excerpt { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.65; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* 分页 */
.pagination { display: flex; justify-content: center; align-items: center; gap: 8px; margin-top: 40px; }
.page-btn {
  display: flex; align-items: center; justify-content: center;
  width: 40px; height: 40px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  transition: all .2s;
  text-decoration: none;
  background: var(--bg-card);
}
.page-btn:hover, .page-btn.active { background: var(--tg-blue); color: #fff; border-color: var(--tg-blue); box-shadow: 0 0 16px rgba(42,171,238,0.4); text-decoration: none; }
.page-btn.active { pointer-events: none; }

/* 侧边栏 */
.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
}
.sidebar-widget-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  display: flex; align-items: center; gap: 8px;
}
.sidebar-list { display: flex; flex-direction: column; gap: 12px; }
.sidebar-list-item { display: flex; gap: 12px; align-items: flex-start; }
.sidebar-list-num {
  width: 22px; height: 22px;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-color);
  color: var(--tg-blue);
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.sidebar-list-item a { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.5; }
.sidebar-list-item a:hover { color: var(--tg-blue); }
.sidebar-list-item .meta { font-size: 0.75rem; color: var(--text-muted); margin-top: 2px; }

/* 标签云 */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-item {
  background: var(--bg-glass-light);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.78rem;
  padding: 5px 12px;
  border-radius: 20px;
  transition: all .2s;
  text-decoration: none;
  font-weight: 500;
}
.tag-item:hover { background: var(--bg-glass-light); border-color: var(--tg-blue); color: var(--tg-blue); text-decoration: none; }

/* ============================================================
   内容页
   ============================================================ */
.article-layout { display: grid; grid-template-columns: 1fr 300px; gap: 32px; padding: 48px 0; }
.article-content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 40px;
}
.article-header { margin-bottom: 28px; }
.article-header h1 { font-size: 1.7rem; font-weight: 800; color: var(--text-white); line-height: 1.4; margin-bottom: 16px; letter-spacing: -0.3px; }
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; color: var(--text-muted); font-size: 0.82rem; }
.article-meta-item { display: flex; align-items: center; gap: 5px; }
.article-cover { width: 100%; border-radius: var(--radius-sm); margin-bottom: 28px; max-height: 400px; object-fit: cover; border: 1px solid var(--border-color); }
.article-body { font-size: 0.975rem; line-height: 1.9; color: var(--text-secondary); }
.article-body h2 { font-size: 1.35rem; font-weight: 700; margin: 32px 0 14px; color: var(--text-white); }
.article-body h3 { font-size: 1.15rem; font-weight: 700; margin: 24px 0 10px; color: var(--text-white); }
.article-body p { margin-bottom: 16px; }
.article-body ul, .article-body ol { margin: 16px 0 16px 24px; }
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: 8px; color: var(--text-secondary); }
.article-body blockquote {
  border-left: 3px solid var(--tg-blue);
  background: var(--bg-glass-light);
  padding: 16px 20px;
  margin: 20px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-style: italic;
}
.article-body a { color: var(--tg-blue); }
.article-body table { width: 100%; border-collapse: collapse; margin: 20px 0; }
.article-body th { background: var(--bg-secondary); padding: 10px 14px; text-align: left; font-weight: 600; border: 1px solid var(--border-color); color: var(--text-white); font-size: 0.875rem; }
.article-body td { padding: 10px 14px; border: 1px solid var(--border-color); color: var(--text-secondary); font-size: 0.875rem; }
.article-body tr:nth-child(even) td { background: var(--bg-secondary); }
.article-body code { background: var(--bg-secondary); border: 1px solid var(--border-color); padding: 2px 6px; border-radius: 4px; font-size: 0.85em; color: var(--tg-blue); }
.article-body pre { background: var(--bg-secondary); border: 1px solid var(--border-color); padding: 16px; border-radius: var(--radius-sm); overflow-x: auto; margin: 16px 0; }

/* 文章标签 */
.article-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--border-color); }
.article-tags-label { font-size: 0.82rem; font-weight: 600; color: var(--text-muted); }

/* 相关文章 */
.related-articles { margin-top: 28px; }
.related-articles h3 { font-size: 1rem; font-weight: 700; color: var(--text-white); margin-bottom: 14px; }
.related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.related-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px;
  transition: all .2s;
}
.related-item:hover { border-color: var(--border-glow); background: var(--bg-card-hover); }
.related-item a { font-size: 0.875rem; font-weight: 600; color: var(--text-secondary); line-height: 1.5; display: block; margin-bottom: 5px; }
.related-item a:hover { color: var(--tg-blue); text-decoration: none; }
.related-item .meta { font-size: 0.75rem; color: var(--text-muted); }

/* ============================================================
   下载页
   ============================================================ */
.download-hero {
  padding: 80px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}
.download-hero::before {
  content: '';
  position: absolute;
  top: -100px; left: 50%;
  transform: translateX(-50%);
  width: 600px; height: 400px;
  background: radial-gradient(ellipse, rgba(42,171,238,0.1) 0%, transparent 65%);
  pointer-events: none;
}
.download-hero h1 { font-size: 2.4rem; font-weight: 900; color: var(--text-white); margin-bottom: 16px; letter-spacing: -0.5px; }
.download-hero p { font-size: 1.05rem; color: var(--text-secondary); max-width: 560px; margin: 0 auto 28px; }
.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.platforms-section { padding: 80px 0; position: relative; z-index: 1; }
.platforms-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 48px; }
.platform-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 36px 32px;
  text-align: center;
  transition: all .3s;
  position: relative;
  overflow: hidden;
}
.platform-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-blue);
  opacity: 0;
  transition: opacity .3s;
}
.platform-card:hover { border-color: var(--border-glow); box-shadow: var(--shadow-hover); transform: translateY(-6px); }
.platform-card:hover::before { opacity: 0.03; }
.platform-icon { font-size: 3rem; margin-bottom: 16px; filter: drop-shadow(0 0 12px rgba(42,171,238,0.3)); position: relative; }
.platform-card h3 { font-size: 1.15rem; font-weight: 700; color: var(--text-white); margin-bottom: 8px; position: relative; }
.platform-card p { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.7; position: relative; }
.platform-card .btn-dl {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--grad-blue);
  color: #fff;
  padding: 12px 28px;
  border-radius: 24px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: all .2s;
  box-shadow: 0 4px 16px rgba(42,171,238,0.3);
  position: relative;
}
.platform-card .btn-dl:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(42,171,238,0.5); color: #fff; text-decoration: none; }
.platform-card .btn-dl-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  color: var(--tg-blue);
  padding: 9px 20px;
  border-radius: 24px;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border-color);
  margin-top: 10px;
  transition: all .2s;
  position: relative;
}
.platform-card .btn-dl-secondary:hover { border-color: var(--tg-blue); background: var(--bg-glass-light); text-decoration: none; }

/* 步骤 */
.steps-section { padding: 80px 0; background: var(--bg-secondary); position: relative; z-index: 1; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 48px; }
.step-item { text-align: center; position: relative; }
.step-item:not(:last-child)::after {
  content: '→';
  position: absolute;
  top: 24px; right: -12px;
  color: var(--text-muted);
  font-size: 1rem;
}
.step-num {
  width: 52px; height: 52px;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-color);
  color: var(--tg-blue);
  border-radius: 50%;
  font-size: 1.2rem;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
  transition: all .3s;
}
.step-item:hover .step-num { background: var(--tg-blue); color: #fff; border-color: var(--tg-blue); box-shadow: 0 0 20px rgba(42,171,238,0.4); }
.step-item h3 { font-size: 0.975rem; font-weight: 700; color: var(--text-white); margin-bottom: 8px; }
.step-item p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

/* FAQ */
.faq-section { padding: 80px 0; position: relative; z-index: 1; }
.faq-list { max-width: 760px; margin: 48px auto 0; }
.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  overflow: hidden;
  background: var(--bg-card);
  transition: border-color .2s;
}
.faq-item.open { border-color: var(--border-glow); }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
  background: transparent;
  transition: background .2s;
}
.faq-question:hover { background: var(--bg-glass-light); }
.faq-question .icon { color: var(--tg-blue); font-size: 1.1rem; transition: transform .3s; flex-shrink: 0; }
.faq-item.open .faq-question .icon { transform: rotate(45deg); }
.faq-answer { display: none; padding: 0 22px 18px; font-size: 0.875rem; color: var(--text-secondary); line-height: 1.8; }
.faq-item.open .faq-answer { display: block; }

/* ============================================================
   CTA 区块
   ============================================================ */
.cta-section {
  padding: 100px 0;
  text-align: center;
  position: relative;
  z-index: 1;
  overflow: hidden;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}
.cta-section::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
  width: 600px; height: 400px;
  background: radial-gradient(ellipse, rgba(42,171,238,0.08) 0%, transparent 65%);
  pointer-events: none;
}
.cta-section h2 { font-size: 2.2rem; font-weight: 900; color: var(--text-white); margin-bottom: 16px; letter-spacing: -0.5px; position: relative; }
.cta-section p { font-size: 1rem; color: var(--text-secondary); margin-bottom: 36px; max-width: 520px; margin-left: auto; margin-right: auto; position: relative; }
.cta-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; position: relative; }

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 64px 0 0;
  position: relative;
  z-index: 1;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand {}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  text-decoration: none;
}
.footer-logo img { width: 34px; height: 34px; border-radius: 9px; box-shadow: 0 0 12px rgba(42,171,238,0.3); }
.footer-logo span { font-size: 1.1rem; font-weight: 800; color: var(--text-white); }
.footer-brand p { font-size: 0.85rem; line-height: 1.75; color: var(--text-muted); }
.footer-social { display: flex; gap: 8px; margin-top: 16px; }
.footer-social a {
  width: 34px; height: 34px;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: all .2s;
  text-decoration: none;
}
.footer-social a:hover { border-color: var(--tg-blue); color: var(--tg-blue); background: var(--bg-glass-light); }
.footer-col h4 { font-size: 0.85rem; font-weight: 700; color: var(--text-white); margin-bottom: 16px; letter-spacing: 0.5px; text-transform: uppercase; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { font-size: 0.85rem; color: var(--text-muted); transition: color .2s; }
.footer-col ul li a:hover { color: var(--tg-blue); text-decoration: none; }
.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--tg-blue); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .step-item:not(:last-child)::after { display: none; }
}
@media (max-width: 768px) {
  .hero-title { font-size: 2.2rem; }
  .list-layout, .article-layout { grid-template-columns: 1fr; }
  .download-grid, .platforms-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .main-nav { display: none; }
  .menu-toggle { display: flex; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: rgba(10,14,26,0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 16px;
    z-index: 999;
  }
  .header-inner { position: relative; }
  .features-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .article-content-box { padding: 24px 16px; }
  .carousel-slide-inner { height: 280px; }
}
@media (max-width: 480px) {
  .hero-title { font-size: 1.8rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .steps-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .stat-item + .stat-item::before { display: none; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .section-title { font-size: 1.7rem; }
}

/* ============================================================
   工具类
   ============================================================ */
.text-center { text-align: center; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.relative { position: relative; }
.z1 { position: relative; z-index: 1; }