/* ============================================================
   Viber官网模板 - 主样式文件
   品牌色: #7360f2 (主紫) | #5c4ed4 (深紫) | #f5f3ff (浅紫背景)
   ============================================================ */

/* ---- 全局重置 ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary:    #7360f2;
  --color-primary-dark: #5c4ed4;
  --color-primary-light: #ae9ef4;
  --color-bg-light:   #f5f3ff;
  --color-white:      #ffffff;
  --color-text:       #1a1a2e;
  --color-text-muted: #6b6b8a;
  --color-border:     #e2deff;
  --font-main:        'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --radius-sm:        6px;
  --radius-md:        12px;
  --radius-lg:        24px;
  --shadow-card:      0 4px 24px rgba(115,96,242,0.10);
  --shadow-btn:       0 4px 16px rgba(115,96,242,0.30);
  --transition:       0.25s ease;
}

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

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

ul, ol { list-style: none; }

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

/* ============================================================
   导航栏
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 12px rgba(115,96,242,0.07);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}
.site-logo svg { width: 36px; height: 36px; }
.site-logo span { color: var(--color-text); }

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

.main-nav a {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  transition: background var(--transition), color var(--transition);
}
.main-nav a:hover,
.main-nav a.active {
  background: var(--color-bg-light);
  color: var(--color-primary);
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ---- 按钮系统 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-btn);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(115,96,242,0.40);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-white {
  background: var(--color-white);
  color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}
.btn-white:hover {
  background: var(--color-bg-light);
  color: var(--color-primary-dark);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.05rem;
}

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

/* ============================================================
   Hero 轮播区
   ============================================================ */
.hero-slider {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #5c4ed4 0%, #7360f2 50%, #9b8af5 100%);
  min-height: 580px;
  display: flex;
  align-items: center;
}

.hero-slide {
  display: none;
  width: 100%;
}
.hero-slide.active { display: flex; }

.hero-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
  padding: 80px 0;
  width: 100%;
}

.hero-text {
  flex: 1;
  color: var(--color-white);
  max-width: 560px;
}

.hero-badge {
  display: inline-block;
  background: rgba(255,255,255,0.18);
  color: var(--color-white);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 20px;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.25);
}

.hero-text h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-text p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 36px;
  line-height: 1.8;
}

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

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  max-width: 500px;
}
.hero-image img {
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 64px rgba(0,0,0,0.25);
  max-height: 420px;
  object-fit: cover;
}

/* 轮播指示器 */
.slider-dots {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
}
.slider-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}
.slider-dot.active {
  background: var(--color-white);
  width: 24px;
  border-radius: 4px;
}

/* 轮播箭头 */
.slider-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.2);
  border: none;
  color: white;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
  backdrop-filter: blur(8px);
  z-index: 10;
}
.slider-arrow:hover { background: rgba(255,255,255,0.35); }
.slider-arrow.prev { left: 20px; }
.slider-arrow.next { right: 20px; }

/* ============================================================
   通用区块标题
   ============================================================ */
.section {
  padding: 80px 0;
}
.section-alt {
  background: var(--color-bg-light);
}
.section-dark {
  background: linear-gradient(135deg, #5c4ed4 0%, #7360f2 100%);
  color: var(--color-white);
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header .label {
  display: inline-block;
  background: var(--color-bg-light);
  color: var(--color-primary);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-dark .section-header .label {
  background: rgba(255,255,255,0.15);
  color: var(--color-white);
}
.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.3px;
}
.section-header p {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}
.section-dark .section-header p { color: rgba(255,255,255,0.8); }

/* ============================================================
   功能特性卡片
   ============================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.feature-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(115,96,242,0.18);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.feature-icon svg { width: 28px; height: 28px; color: var(--color-primary); }

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-text);
}
.feature-card p {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ============================================================
   下载平台区块
   ============================================================ */
.download-platforms {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.platform-block {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
}

.platform-block h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}
.platform-block > p {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-bottom: 28px;
}

.platform-image {
  width: 100%;
  border-radius: var(--radius-md);
  margin-bottom: 28px;
  object-fit: contain;
  max-height: 260px;
}

.download-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: var(--color-text);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition);
}
.store-btn:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}
.store-btn svg { width: 20px; height: 20px; flex-shrink: 0; }
.store-btn-text { line-height: 1.2; }
.store-btn-text small { display: block; font-size: 0.7rem; font-weight: 400; opacity: 0.8; }

.version-list {
  margin-top: 20px;
}
.version-list h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.version-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.version-links a {
  font-size: 0.88rem;
  color: var(--color-primary);
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 6px;
}
.version-links a:hover { color: var(--color-primary-dark); }
.version-links a::before {
  content: '↓';
  font-size: 0.8rem;
}

/* ============================================================
   文章列表
   ============================================================ */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.article-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}
.article-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(115,96,242,0.15);
}

.article-card-thumb {
  width: 100%;
  height: 200px;
  object-fit: cover;
}
.article-card-thumb-placeholder {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--color-bg-light), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
}
.article-card-thumb-placeholder svg {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  opacity: 0.5;
}

.article-card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.article-category {
  background: var(--color-bg-light);
  color: var(--color-primary);
  padding: 3px 10px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
}
.article-date {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.article-card-body h3 {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 10px;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-card-body h3 a { color: inherit; }
.article-card-body h3 a:hover { color: var(--color-primary); }

.article-card-body p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}
.read-more {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 4px;
}
.read-more::after { content: '→'; }
.read-more:hover { gap: 8px; }

.article-views {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-white);
}
.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  flex-wrap: wrap;
}
.breadcrumb-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-muted);
}
.breadcrumb-list li:not(:last-child)::after {
  content: '/';
  color: var(--color-border);
}
.breadcrumb-list a { color: var(--color-primary); }
.breadcrumb-list .current { color: var(--color-text); font-weight: 500; }

/* ============================================================
   分页
   ============================================================ */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 56px;
  flex-wrap: wrap;
}
.page-item {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.page-item:hover,
.page-item.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}
.page-item.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ============================================================
   内容页
   ============================================================ */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 48px;
  align-items: start;
  padding: 48px 0;
}

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

.article-header {
  margin-bottom: 32px;
}
.article-header h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--color-text);
}

.article-info {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}
.article-info span { display: flex; align-items: center; gap: 6px; }

.article-featured-image {
  width: 100%;
  border-radius: var(--radius-md);
  margin-bottom: 32px;
  box-shadow: var(--shadow-card);
}

.article-body {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text);
}
.article-body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 36px 0 16px;
  color: var(--color-text);
  padding-left: 16px;
  border-left: 4px solid var(--color-primary);
}
.article-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--color-text);
}
.article-body p { margin-bottom: 20px; }
.article-body ul, .article-body ol {
  margin: 16px 0 20px 24px;
}
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: 8px; }
.article-body img {
  border-radius: var(--radius-md);
  margin: 24px 0;
  box-shadow: var(--shadow-card);
}
.article-body a { color: var(--color-primary); text-decoration: underline; }
.article-body blockquote {
  border-left: 4px solid var(--color-primary);
  background: var(--color-bg-light);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-style: italic;
  color: var(--color-text-muted);
}

/* 侧边栏 */
.sidebar {
  position: sticky;
  top: 88px;
}
.sidebar-widget {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
  margin-bottom: 24px;
}
.sidebar-widget h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary);
  color: var(--color-text);
}

.sidebar-article-list { display: flex; flex-direction: column; gap: 16px; }
.sidebar-article-item { display: flex; gap: 12px; align-items: flex-start; }
.sidebar-article-thumb {
  width: 72px;
  height: 56px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}
.sidebar-article-info h5 {
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.sidebar-article-info h5 a { color: var(--color-text); }
.sidebar-article-info h5 a:hover { color: var(--color-primary); }
.sidebar-article-info span {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-item {
  background: var(--color-bg-light);
  color: var(--color-primary);
  padding: 5px 12px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all var(--transition);
}
.tag-item:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ============================================================
   统计数字区
   ============================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-item {
  text-align: center;
  padding: 32px 16px;
}
.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 8px;
}
.section-dark .stat-number { color: var(--color-white); }
.stat-label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  font-weight: 500;
}
.section-dark .stat-label { color: rgba(255,255,255,0.75); }

/* ============================================================
   社区/评价区
   ============================================================ */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.testimonial-card {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-md);
  padding: 28px;
  backdrop-filter: blur(8px);
}
.testimonial-stars {
  color: #fbbf24;
  font-size: 1rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}
.testimonial-card p {
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.9);
  margin-bottom: 20px;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
}
.testimonial-author-info strong {
  display: block;
  font-size: 0.9rem;
  color: white;
  font-weight: 600;
}
.testimonial-author-info span {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.65);
}

/* ============================================================
   FAQ 区块
   ============================================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--color-text);
  background: var(--color-white);
  transition: background var(--transition);
  user-select: none;
}
.faq-question:hover { background: var(--color-bg-light); }
.faq-question.open { color: var(--color-primary); background: var(--color-bg-light); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-question.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  display: none;
  padding: 0 24px 20px;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  background: var(--color-bg-light);
}
.faq-answer.open { display: block; }

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: #1a1a2e;
  color: rgba(255,255,255,0.75);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .site-logo {
  color: var(--color-primary-light);
  margin-bottom: 16px;
}
.footer-brand .site-logo span { color: white; }
.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.footer-social {
  display: flex;
  gap: 12px;
}
.social-link {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  transition: all var(--transition);
}
.social-link:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}
.social-link svg { width: 18px; height: 18px; }

.footer-col h5 {
  font-size: 0.9rem;
  font-weight: 700;
  color: white;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.65);
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: var(--color-primary-light); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-bottom p {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.45);
}
.footer-bottom-links {
  display: flex;
  gap: 20px;
}
.footer-bottom-links a {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.45);
}
.footer-bottom-links a:hover { color: var(--color-primary-light); }

/* ============================================================
   列表页侧边栏
   ============================================================ */
.list-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  padding: 48px 0;
  align-items: start;
}

.list-header {
  margin-bottom: 32px;
}
.list-header h1 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--color-text);
}
.list-header p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* ============================================================
   下载页专用
   ============================================================ */
.download-hero {
  background: linear-gradient(135deg, #5c4ed4 0%, #7360f2 100%);
  padding: 80px 0;
  color: white;
  text-align: center;
}
.download-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin-bottom: 16px;
}
.download-hero p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 40px;
}

.download-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.download-tab {
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid var(--color-border);
  background: var(--color-white);
  color: var(--color-text-muted);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}
.download-tab:hover,
.download-tab.active {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: white;
}
.download-tab svg { width: 20px; height: 20px; }

.download-content-area {
  display: none;
}
.download-content-area.active { display: block; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .download-platforms { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: white;
    padding: 16px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    z-index: 999;
  }

  .hero-content {
    flex-direction: column;
    text-align: center;
    padding: 48px 0;
  }
  .hero-actions { justify-content: center; }
  .hero-image { max-width: 100%; }

  .content-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }

  .list-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }

  .section { padding: 56px 0; }
  .features-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .btn-lg { padding: 14px 28px; }
  .hero-text h1 { font-size: 1.8rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================================
   工具类
   ============================================================ */
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-16 { gap: 16px; }
.hidden { display: none; }

/* 安全/加密特性高亮块 */
.security-highlight {
  background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: flex;
  gap: 48px;
  align-items: center;
}
.security-highlight img {
  max-width: 420px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}
.security-text h2 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--color-text);
}
.security-text p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 24px;
}
.security-points {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}
.security-point {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.92rem;
  color: var(--color-text);
}
.security-point-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  flex-shrink: 0;
  margin-top: 2px;
}

@media (max-width: 768px) {
  .security-highlight {
    flex-direction: column;
    padding: 32px 24px;
    gap: 28px;
  }
  .security-highlight img { max-width: 100%; }
}

/* CTA Banner */
.cta-banner {
  background: linear-gradient(135deg, #5c4ed4 0%, #7360f2 100%);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  text-align: center;
  color: white;
  margin: 0 0 80px;
}
.cta-banner h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
}
.cta-banner p {
  font-size: 1rem;
  opacity: 0.85;
  margin-bottom: 32px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}
.cta-banner .btn-white { margin: 0 8px; }

@media (max-width: 768px) {
  .cta-banner { padding: 40px 24px; }
  .cta-banner h2 { font-size: 1.5rem; }
}