/* ===== 91网 主样式文件 ===== */
/* 全局变量 */
:root {
  --primary: #1a6ef5;
  --primary-dark: #1255cc;
  --primary-light: #e8f0fe;
  --secondary: #ff6b35;
  --secondary-dark: #e55a28;
  --text-primary: #1a1a2e;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --bg-white: #ffffff;
  --bg-light: #f7f9fc;
  --bg-gray: #edf2f7;
  --border: #e2e8f0;
  --border-dark: #cbd5e0;
  --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(0,0,0,0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font-main: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition: 0.25s ease;
}

/* 重置样式 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* 容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== 头部导航 ===== */
.site-header {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 20px;
}

/* Logo */
.site-logo a {
  display: flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
}
.logo-icon {
  background: var(--primary);
  color: #fff;
  font-size: 22px;
  font-weight: 900;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  letter-spacing: -1px;
}
.logo-text {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 1px;
}

/* 主导航 */
.main-nav ul {
  display: flex;
  gap: 4px;
  align-items: center;
}
.main-nav ul li a {
  display: block;
  padding: 6px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}
.main-nav ul li a:hover,
.main-nav ul li.active a {
  color: var(--primary);
  background: var(--primary-light);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* 搜索框 */
.header-search-bar {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.search-wrap { display: flex; flex-direction: column; gap: 8px; }
.search-form {
  display: flex;
  gap: 0;
  max-width: 600px;
  border: 2px solid var(--primary);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-white);
}
.search-input {
  flex: 1;
  padding: 10px 16px;
  font-size: 14px;
  border: none;
  outline: none;
  font-family: inherit;
  color: var(--text-primary);
}
.search-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background var(--transition);
  white-space: nowrap;
}
.search-btn:hover { background: var(--primary-dark); }
.search-tips {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.search-tips a {
  color: var(--primary);
  font-size: 13px;
  padding: 2px 8px;
  background: var(--primary-light);
  border-radius: 20px;
  transition: all var(--transition);
}
.search-tips a:hover { background: var(--primary); color: #fff; }

/* ===== 通用按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(26,110,245,0.3);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-1px);
}
.btn-block { display: flex; width: 100%; margin-bottom: 10px; }

/* ===== 通用区块 ===== */
.section { padding: 72px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.3;
}
.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}
.section-more { text-align: center; margin-top: 40px; }

/* ===== 首屏Banner ===== */
.hero-banner {
  background: linear-gradient(135deg, #e8f0fe 0%, #f0f7ff 50%, #fff5f0 100%);
  padding: 80px 0 60px;
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
}
.hero-title {
  font-size: 42px;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 18px;
}
.hero-title .highlight {
  color: var(--primary);
  position: relative;
}
.hero-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 28px;
}
.hero-stats {
  display: flex;
  gap: 28px;
  margin-bottom: 32px;
  padding: 20px;
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.stat-item { text-align: center; }
.stat-item strong {
  display: block;
  font-size: 22px;
  font-weight: 800;
  color: var(--primary);
}
.stat-item span { font-size: 13px; color: var(--text-muted); }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-image { position: relative; }
.hero-image img {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  width: 100%;
}
.hero-play-badge {
  position: absolute;
  bottom: 20px;
  left: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
}
.play-icon { color: var(--secondary); font-size: 16px; }

/* ===== 功能区块 ===== */
.features-section { background: var(--bg-white); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature-card {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  border: 1px solid var(--border);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}
.feature-icon { font-size: 36px; margin-bottom: 14px; }
.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}
.feature-card img {
  border-radius: var(--radius-md);
  width: 100%;
  object-fit: cover;
  height: 180px;
}

/* ===== 场景区块 ===== */
.scenarios-section { background: var(--bg-light); }
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.scenario-item {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.scenario-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}
.scenario-icon { font-size: 32px; margin-bottom: 12px; }
.scenario-item h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.scenario-item p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ===== 视频卡片 ===== */
.videos-section { background: var(--bg-white); }
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.video-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}
.video-thumb-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: var(--bg-gray);
}
.video-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb { transform: scale(1.05); }
.video-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.video-card:hover .video-overlay { background: rgba(0,0,0,0.45); }
.play-btn {
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--transition);
  background: none;
  border: none;
  cursor: pointer;
}
.video-card:hover .play-btn {
  opacity: 1;
  transform: scale(1);
}
.play-icon-circle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  font-size: 22px;
  color: var(--primary);
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 20px;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
  flex-wrap: wrap;
}

/* ===== 教程步骤 ===== */
.tutorial-section { background: var(--bg-light); }
.tutorial-steps { display: flex; flex-direction: column; gap: 20px; max-width: 800px; margin: 0 auto; }
.step-item {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.step-item:hover { box-shadow: var(--shadow-md); border-color: var(--primary); }
.step-num {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  font-size: 18px;
  font-weight: 800;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-content h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.step-content p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ===== 更新日志 ===== */
.changelog-section { background: var(--bg-white); }
.changelog-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.changelog-item {
  display: flex;
  gap: 20px;
  background: var(--bg-light);
  border-radius: var(--radius-md);
  padding: 20px;
  border-left: 4px solid var(--primary);
}
.changelog-date {
  flex-shrink: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 90px;
  padding-top: 2px;
}
.changelog-content h3 { font-size: 15px; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.changelog-content p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }
.changelog-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 6px;
  text-transform: uppercase;
}
.changelog-tag.new { background: #d1fae5; color: #065f46; }
.changelog-tag.update { background: #dbeafe; color: #1e40af; }
.changelog-tag.fix { background: #fef3c7; color: #92400e; }

/* ===== FAQ ===== */
.faq-section { background: var(--bg-light); }
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.faq-item:hover { box-shadow: var(--shadow-sm); }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  cursor: pointer;
  user-select: none;
  gap: 12px;
}
.faq-question h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
  margin: 0;
}
.faq-arrow {
  font-size: 12px;
  color: var(--text-muted);
  transition: transform var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  display: none;
  padding: 0 22px 18px;
  border-top: 1px solid var(--border);
}
.faq-item.open .faq-answer { display: block; }
.faq-answer p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  padding-top: 14px;
}

/* ===== 用户评价 ===== */
.reviews-section { background: var(--bg-white); }
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review-card {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.review-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.reviewer-avatar {
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.reviewer-info { flex: 1; }
.reviewer-name { display: block; font-size: 15px; font-weight: 700; color: var(--text-primary); }
.reviewer-tag { font-size: 12px; color: var(--text-muted); }
.review-stars { color: #f59e0b; font-size: 14px; }
.review-text { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 12px; }
.review-date { font-size: 12px; color: var(--text-muted); }

/* ===== 联系我们 ===== */
.contact-section { background: var(--bg-light); }
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.contact-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.contact-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--primary); }
.contact-icon { font-size: 36px; margin-bottom: 12px; }
.contact-card h3 { font-size: 16px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.contact-card p { font-size: 14px; color: var(--primary); font-weight: 600; margin-bottom: 6px; }
.contact-card span { font-size: 12px; color: var(--text-muted); }
.contact-domain { font-size: 13px !important; word-break: break-all; }

/* ===== 页脚 ===== */
.site-footer {
  background: #1a1a2e;
  color: #a0aec0;
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 16px;
}
.footer-logo .logo-icon {
  background: var(--primary);
  color: #fff;
  font-size: 20px;
  font-weight: 900;
  padding: 3px 9px;
  border-radius: var(--radius-sm);
}
.footer-logo .logo-text {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
}
.footer-desc { font-size: 13px; line-height: 1.8; margin-bottom: 20px; color: #718096; }
.footer-social { display: flex; gap: 8px; flex-wrap: wrap; }
.social-link {
  padding: 5px 12px;
  background: rgba(255,255,255,0.08);
  color: #a0aec0;
  border-radius: 20px;
  font-size: 12px;
  transition: all var(--transition);
}
.social-link:hover { background: var(--primary); color: #fff; }
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  font-size: 13px;
  color: #718096;
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: var(--primary); }
.footer-contact li { margin-bottom: 10px; font-size: 13px; }
.contact-label { color: #718096; }
.footer-domain { color: var(--primary); font-size: 13px; }
.footer-bottom {
  padding: 20px 0;
}
.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.copyright { font-size: 13px; color: #718096; }
.update-time { font-size: 12px; color: #4a5568; }
.footer-links { display: flex; gap: 16px; }
.footer-links a { font-size: 12px; color: #718096; }
.footer-links a:hover { color: var(--primary); }

/* ===== 内页样式 ===== */
.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  padding: 48px 0 40px;
}
.page-hero h1 { font-size: 32px; font-weight: 800; margin-bottom: 10px; }
.page-hero p { font-size: 16px; opacity: 0.85; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 16px;
}
.breadcrumb a { color: rgba(255,255,255,0.8); }
.breadcrumb a:hover { color: #fff; }
.page-content { padding: 48px 0 72px; }
.content-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  align-items: start;
}
.main-content h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.main-content p { font-size: 15px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }

/* 侧边栏 */
.sidebar { position: sticky; top: 130px; }
.sidebar-widget {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
}
.sidebar-widget h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary);
}
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-list li a {
  display: block;
  padding: 5px 12px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.tag-list li a:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.version-list li { margin-bottom: 8px; }
.version-list li a { font-size: 13px; color: var(--text-secondary); }
.version-list li a:hover { color: var(--primary); }

/* 功能详情 */
.feature-detail-list { display: flex; flex-direction: column; gap: 24px; margin-top: 24px; }
.feature-detail-item {
  background: var(--bg-light);
  border-radius: var(--radius-md);
  padding: 24px;
  border-left: 4px solid var(--primary);
}
.feature-detail-item h3 { font-size: 17px; font-weight: 700; color: var(--text-primary); margin-bottom: 10px; }
.feature-detail-item p { font-size: 14px; color: var(--text-secondary); line-height: 1.8; margin: 0; }

/* 更新日志完整版 */
.changelog-full { display: flex; flex-direction: column; gap: 32px; }
.changelog-version {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border);
}
.version-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.version-header h2 { font-size: 20px; font-weight: 700; color: var(--text-primary); }
.version-date { font-size: 13px; color: var(--text-muted); }
.version-changes { display: flex; flex-direction: column; gap: 12px; }
.change-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.change-tag {
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  margin-top: 2px;
}
.change-item.new .change-tag { background: #d1fae5; color: #065f46; }
.change-item.update .change-tag { background: #dbeafe; color: #1e40af; }
.change-item.fix .change-tag { background: #fef3c7; color: #92400e; }

/* 下载中心 */
.download-section { max-width: 900px; margin: 0 auto; }
.download-section h2 { font-size: 26px; font-weight: 700; margin-bottom: 12px; }
.download-section > p { font-size: 15px; color: var(--text-secondary); margin-bottom: 32px; }
.download-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.download-card {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.download-card:hover { box-shadow: var(--shadow-md); border-color: var(--primary); }
.download-icon { font-size: 48px; margin-bottom: 16px; }
.download-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.download-card p { font-size: 14px; color: var(--text-secondary); margin-bottom: 8px; }
.version-info { font-size: 12px; color: var(--text-muted); margin-bottom: 20px !important; }

/* 帮助中心 */
.help-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}
.help-card {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border);
}
.help-icon { font-size: 32px; margin-bottom: 12px; }
.help-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 14px; }
.help-card ul li { margin-bottom: 10px; }
.help-card ul li a { font-size: 14px; color: var(--primary); }
.help-card ul li a:hover { text-decoration: underline; }
.help-contact {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border);
}
.help-contact h2 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.help-contact p { font-size: 14px; color: var(--text-secondary); margin-bottom: 8px; }

/* 实用技巧 */
.tips-list { display: flex; flex-direction: column; gap: 20px; margin-top: 20px; }
.tip-item {
  background: var(--bg-light);
  border-radius: var(--radius-md);
  padding: 22px;
  border-left: 4px solid var(--secondary);
}
.tip-item h3 { font-size: 16px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.tip-item p { font-size: 14px; color: var(--text-secondary); line-height: 1.8; margin: 0; }

/* 联系我们页面 */
.contact-page-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}
.contact-info h2 { font-size: 24px; font-weight: 700; margin-bottom: 24px; }
.contact-items { display: flex; flex-direction: column; gap: 20px; margin-bottom: 28px; }
.contact-item {
  background: var(--bg-light);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid var(--border);
}
.contact-item h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.contact-item p { font-size: 14px; color: var(--text-secondary); margin-bottom: 4px; }
.contact-social h3 { font-size: 16px; font-weight: 700; margin-bottom: 12px; }
.social-links { display: flex; gap: 10px; flex-wrap: wrap; }
.social-btn {
  padding: 8px 16px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: all var(--transition);
}
.social-btn:hover { background: var(--primary); color: #fff; }
.contact-form-wrap h2 { font-size: 24px; font-weight: 700; margin-bottom: 24px; }
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 14px; font-weight: 600; color: var(--text-primary); }
.form-group input,
.form-group select,
.form-group textarea {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  color: var(--text-primary);
  transition: border-color var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--primary); }
.form-group textarea { resize: vertical; }

/* 关于我们 */
.about-content { max-width: 860px; margin: 0 auto; }
.about-section { margin-bottom: 40px; }
.about-section h2 { font-size: 24px; font-weight: 700; margin-bottom: 16px; }
.about-section p { font-size: 15px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 12px; }
.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 20px;
}
.about-stat {
  background: var(--bg-light);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  border: 1px solid var(--border);
}
.about-stat strong { display: block; font-size: 24px; font-weight: 800; color: var(--primary); margin-bottom: 6px; }
.about-stat span { font-size: 13px; color: var(--text-muted); }
.about-promises { display: flex; flex-direction: column; gap: 10px; margin-top: 12px; }
.about-promises li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.about-promises li::before { content: "✓"; color: var(--primary); font-weight: 700; flex-shrink: 0; }

/* 视频弹窗 */
.video-modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}
.video-modal-overlay.active { display: flex; }
.video-modal {
  background: var(--bg-white);
  border-radius: var(--radius-xl);
  padding: 24px;
  max-width: 700px;
  width: 90%;
  position: relative;
}
.video-modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 24px;
  color: var(--text-muted);
  cursor: pointer;
  background: none;
  border: none;
  line-height: 1;
}
.video-modal-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-right: 32px;
}
.video-player-wrap {
  position: relative;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.video-player-placeholder {
  text-align: center;
  color: #fff;
}
.video-player-placeholder .big-play { font-size: 64px; margin-bottom: 16px; }
.video-player-placeholder p { font-size: 15px; opacity: 0.8; }

/* 搜索结果提示 */
.search-result-toast {
  display: none;
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-primary);
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  z-index: 9999;
  box-shadow: var(--shadow-lg);
}
.search-result-toast.show { display: block; }