/* 17C品牌官方网站 - 主样式文件 */
:root {
  --primary: #e8380d;
  --primary-dark: #c22d09;
  --secondary: #ff6b35;
  --accent: #ffa500;
  --bg: #f5f5f5;
  --bg-white: #ffffff;
  --text-main: #1a1a1a;
  --text-sub: #555555;
  --text-light: #888888;
  --border: #e0e0e0;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --radius: 8px;
  --radius-lg: 14px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text-main);
  font-size: 14px;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  padding: 5px 0;
  text-align: center;
}
.top-bar a { color: #ffe0d0; margin: 0 8px; }

/* ===== 头部 ===== */
.site-header {
  background: #fff;
  border-bottom: 2px solid var(--primary);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  height: 60px;
  gap: 24px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  width: 42px;
  height: 42px;
  background: var(--primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -1px;
}
.logo-text {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 1px;
}
.logo-sub {
  font-size: 11px;
  color: var(--text-light);
  margin-top: -2px;
}

/* 导航 */
.main-nav { flex: 1; }
.main-nav ul {
  display: flex;
  gap: 0;
  align-items: center;
}
.main-nav ul li a {
  display: block;
  padding: 0 14px;
  height: 60px;
  line-height: 60px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
  transition: all 0.2s;
  white-space: nowrap;
}
.main-nav ul li a:hover,
.main-nav ul li a.active {
  color: var(--primary);
  border-bottom: 2px solid var(--primary);
}

/* 搜索框 */
.header-search {
  display: flex;
  align-items: center;
  background: #f5f5f5;
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  width: 220px;
  flex-shrink: 0;
}
.header-search input {
  border: none;
  background: transparent;
  padding: 7px 14px;
  font-size: 13px;
  width: 100%;
  outline: none;
  color: var(--text-main);
}
.header-search button {
  background: var(--primary);
  border: none;
  padding: 7px 14px;
  color: #fff;
  cursor: pointer;
  font-size: 14px;
  transition: background 0.2s;
}
.header-search button:hover { background: var(--primary-dark); }

/* ===== 搜索提示 ===== */
.search-tip {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-sub);
  box-shadow: var(--shadow);
  white-space: nowrap;
  z-index: 100;
}
.header-search-wrap { position: relative; }
.header-search-wrap.active .search-tip { display: block; }

/* ===== 主容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 8px 0;
  font-size: 12px;
  color: var(--text-light);
}
.breadcrumb a { color: var(--text-sub); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* ===== Banner / 焦点图 ===== */
.hero-section {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  padding: 0;
  overflow: hidden;
  position: relative;
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: stretch;
  min-height: 380px;
}
.hero-content {
  flex: 1;
  padding: 48px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: #fff;
}
.hero-tag {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 12px;
  margin-bottom: 14px;
  font-weight: 600;
  letter-spacing: 1px;
}
.hero-title {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 14px;
}
.hero-title em { color: var(--accent); font-style: normal; }
.hero-desc {
  font-size: 15px;
  color: rgba(255,255,255,0.75);
  margin-bottom: 24px;
  max-width: 420px;
}
.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; }
.btn-primary {
  background: var(--primary);
  color: #fff;
  padding: 10px 24px;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-block;
}
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); }
.btn-outline {
  background: transparent;
  color: #fff;
  padding: 10px 24px;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  border: 1.5px solid rgba(255,255,255,0.5);
  cursor: pointer;
  transition: all 0.2s;
  display: inline-block;
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); color: #fff; }
.hero-image {
  width: 500px;
  flex-shrink: 0;
  overflow: hidden;
  position: relative;
}
.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
}
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 28px;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 22px;
  font-weight: 800;
  color: var(--accent);
}
.hero-stat .label {
  font-size: 11px;
  color: rgba(255,255,255,0.6);
  margin-top: 2px;
}

/* ===== 快捷导航 ===== */
.quick-nav {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.quick-nav-list {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.quick-nav-list::-webkit-scrollbar { display: none; }
.quick-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 20px;
  min-width: 80px;
  cursor: pointer;
  border-radius: var(--radius);
  transition: all 0.2s;
  flex-shrink: 0;
}
.quick-nav-item:hover { background: #fff5f3; color: var(--primary); }
.quick-nav-item .icon {
  font-size: 22px;
  margin-bottom: 4px;
}
.quick-nav-item .text {
  font-size: 12px;
  color: var(--text-sub);
}
.quick-nav-item:hover .text { color: var(--primary); }

/* ===== 主内容区 ===== */
.main-content {
  max-width: 1200px;
  margin: 20px auto;
  padding: 0 16px;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 20px;
}
.content-main { min-width: 0; }
.content-sidebar { min-width: 0; }

/* ===== 模块通用 ===== */
.module {
  background: #fff;
  border-radius: var(--radius-lg);
  margin-bottom: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.module-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px 12px;
  border-bottom: 1px solid #f0f0f0;
}
.module-title-wrap {}
.module-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}
.module-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 18px;
  background: var(--primary);
  border-radius: 2px;
}
.module-subtitle {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 3px;
  padding-left: 12px;
}
.module-more {
  font-size: 12px;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 3px;
  white-space: nowrap;
}
.module-more:hover { color: var(--primary-dark); }
.module-body { padding: 16px 20px; }

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.video-card {
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--border);
  transition: all 0.25s;
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  border-color: var(--primary);
}
.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: #1a1a1a;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 50px;
  height: 50px;
  background: rgba(232,56,13,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all 0.25s;
}
.video-play-btn::after {
  content: '';
  border-left: 18px solid #fff;
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
  margin-left: 4px;
}
.video-card:hover .video-play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
}
.video-tags {
  position: absolute;
  top: 8px;
  left: 8px;
  display: flex;
  gap: 4px;
}
.video-tag {
  background: var(--primary);
  color: #fff;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 3px;
  font-weight: 600;
}
.video-info { padding: 10px 12px; }
.video-title {
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-main);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-light);
}
.video-author {
  display: flex;
  align-items: center;
  gap: 4px;
}
.video-author img {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  object-fit: cover;
}
.video-stats { display: flex; gap: 8px; }
.video-stat { display: flex; align-items: center; gap: 2px; }

/* ===== 热门列表 ===== */
.hot-list { }
.hot-item {
  display: flex;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid #f5f5f5;
  align-items: flex-start;
  cursor: pointer;
  transition: all 0.2s;
}
.hot-item:last-child { border-bottom: none; }
.hot-item:hover { background: #fafafa; margin: 0 -20px; padding: 12px 20px; border-radius: var(--radius); }
.hot-rank {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background: #f0f0f0;
  color: var(--text-light);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.hot-rank.top1 { background: #ff4d4f; color: #fff; }
.hot-rank.top2 { background: #ff7a45; color: #fff; }
.hot-rank.top3 { background: #ffa940; color: #fff; }
.hot-thumb {
  width: 90px;
  height: 60px;
  border-radius: 6px;
  overflow: hidden;
  flex-shrink: 0;
  position: relative;
}
.hot-thumb img { width: 100%; height: 100%; object-fit: cover; }
.hot-thumb-play {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s;
}
.hot-item:hover .hot-thumb-play { opacity: 1; }
.hot-thumb-play::after {
  content: '';
  border-left: 12px solid #fff;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  margin-left: 3px;
}
.hot-content { flex: 1; min-width: 0; }
.hot-title {
  font-size: 13px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.hot-meta { font-size: 11px; color: var(--text-light); display: flex; gap: 10px; flex-wrap: wrap; }
.hot-meta span { display: flex; align-items: center; gap: 3px; }

/* ===== 专题卡片 ===== */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.topic-card {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  aspect-ratio: 4/3;
  cursor: pointer;
}
.topic-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}
.topic-card:hover img { transform: scale(1.06); }
.topic-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.75) 0%, transparent 60%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 12px;
}
.topic-name {
  color: #fff;
  font-size: 13px;
  font-weight: 700;
}
.topic-count {
  color: rgba(255,255,255,0.75);
  font-size: 11px;
  margin-top: 2px;
}
.topic-play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 40px;
  height: 40px;
  background: rgba(232,56,13,0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all 0.25s;
}
.topic-play-icon::after {
  content: '';
  border-left: 14px solid #fff;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  margin-left: 3px;
}
.topic-card:hover .topic-play-icon { opacity: 1; transform: translate(-50%, -50%) scale(1); }

/* ===== 作者卡片 ===== */
.author-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.author-card {
  display: flex;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  align-items: center;
  cursor: pointer;
  transition: all 0.2s;
}
.author-card:hover { border-color: var(--primary); background: #fff5f3; }
.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
}
.author-avatar img { width: 100%; height: 100%; object-fit: cover; }
.author-info { flex: 1; min-width: 0; }
.author-name { font-size: 13px; font-weight: 700; margin-bottom: 3px; }
.author-fans { font-size: 11px; color: var(--primary); font-weight: 600; }
.author-desc { font-size: 11px; color: var(--text-light); margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.author-follow {
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 12px;
  flex-shrink: 0;
  cursor: pointer;
  transition: background 0.2s;
}
.author-follow:hover { background: var(--primary-dark); }

/* ===== 侧边栏 ===== */
.sidebar-module {
  background: #fff;
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.sidebar-header {
  padding: 14px 16px 10px;
  border-bottom: 1px solid #f0f0f0;
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}
.sidebar-header::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 16px;
  background: var(--primary);
  border-radius: 2px;
}
.sidebar-body { padding: 12px 16px; }

/* 侧边栏热门 */
.sidebar-hot-item {
  display: flex;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid #f5f5f5;
  cursor: pointer;
  align-items: flex-start;
}
.sidebar-hot-item:last-child { border-bottom: none; }
.sidebar-hot-item:hover .sidebar-hot-title { color: var(--primary); }
.sidebar-hot-rank {
  width: 18px;
  height: 18px;
  border-radius: 3px;
  background: #f0f0f0;
  color: var(--text-light);
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.sidebar-hot-rank.r1 { background: #ff4d4f; color: #fff; }
.sidebar-hot-rank.r2 { background: #ff7a45; color: #fff; }
.sidebar-hot-rank.r3 { background: #ffa940; color: #fff; }
.sidebar-hot-title { font-size: 12px; line-height: 1.4; color: var(--text-main); }
.sidebar-hot-views { font-size: 11px; color: var(--text-light); margin-top: 2px; }

/* 标签云 */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-item {
  background: #f5f5f5;
  color: var(--text-sub);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
}
.tag-item:hover { background: #fff5f3; color: var(--primary); border-color: var(--primary); }

/* ===== FAQ ===== */
.faq-list { }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
}
.faq-question {
  padding: 14px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #fff;
  transition: background 0.2s;
  user-select: none;
}
.faq-question:hover { background: #fafafa; }
.faq-question .q-icon {
  color: var(--primary);
  font-weight: 800;
  font-size: 16px;
  margin-right: 8px;
}
.faq-question .arrow {
  font-size: 12px;
  color: var(--text-light);
  transition: transform 0.25s;
}
.faq-item.open .faq-question { background: #fff5f3; color: var(--primary); }
.faq-item.open .arrow { transform: rotate(180deg); }
.faq-answer {
  display: none;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
  background: #fafafa;
  border-top: 1px solid var(--border);
}
.faq-item.open .faq-answer { display: block; }

/* ===== 用户评论 ===== */
.comment-list { }
.comment-item {
  display: flex;
  gap: 10px;
  padding: 14px 0;
  border-bottom: 1px solid #f5f5f5;
}
.comment-item:last-child { border-bottom: none; }
.comment-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}
.comment-body { flex: 1; min-width: 0; }
.comment-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}
.comment-user { font-size: 13px; font-weight: 700; }
.comment-time { font-size: 11px; color: var(--text-light); }
.comment-text { font-size: 13px; color: var(--text-sub); line-height: 1.6; }
.comment-actions { display: flex; gap: 12px; margin-top: 6px; }
.comment-action {
  font-size: 11px;
  color: var(--text-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 3px;
}
.comment-action:hover { color: var(--primary); }

/* ===== 互动按钮区 ===== */
.interact-bar {
  display: flex;
  gap: 12px;
  padding: 14px 20px;
  border-top: 1px solid #f0f0f0;
  background: #fafafa;
}
.interact-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 12px;
  cursor: pointer;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text-sub);
  transition: all 0.2s;
}
.interact-btn:hover { border-color: var(--primary); color: var(--primary); background: #fff5f3; }
.interact-btn.liked { background: #fff5f3; border-color: var(--primary); color: var(--primary); }

/* ===== 帮助中心 ===== */
.help-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.help-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}
.help-card:hover { border-color: var(--primary); background: #fff5f3; }
.help-icon { font-size: 28px; margin-bottom: 8px; }
.help-title { font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.help-desc { font-size: 11px; color: var(--text-light); }

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.contact-item {
  display: flex;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  align-items: center;
}
.contact-icon { font-size: 24px; flex-shrink: 0; }
.contact-info {}
.contact-label { font-size: 11px; color: var(--text-light); }
.contact-value { font-size: 13px; font-weight: 600; margin-top: 2px; }

/* ===== 页脚 ===== */
.site-footer {
  background: #1a1a1a;
  color: rgba(255,255,255,0.7);
  margin-top: 40px;
}
.footer-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 16px 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}
.footer-brand {}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.footer-logo-icon {
  width: 38px;
  height: 38px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: 900;
}
.footer-logo-text {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
}
.footer-desc {
  font-size: 12px;
  line-height: 1.8;
  color: rgba(255,255,255,0.5);
  margin-bottom: 14px;
}
.footer-domain {
  font-size: 12px;
  color: rgba(255,255,255,0.4);
}
.footer-domain span { color: var(--accent); }
.footer-col-title {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 16px;
  text-align: center;
  font-size: 12px;
  color: rgba(255,255,255,0.35);
  max-width: 1200px;
  margin: 0 auto;
}
.footer-bottom a { color: rgba(255,255,255,0.4); margin: 0 6px; }
.footer-bottom a:hover { color: var(--primary); }

/* ===== 内页通用 ===== */
.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  padding: 40px 0;
  color: #fff;
  text-align: center;
}
.page-hero h1 { font-size: 28px; font-weight: 800; margin-bottom: 8px; }
.page-hero p { font-size: 15px; opacity: 0.85; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .main-content { grid-template-columns: 1fr; }
  .content-sidebar { display: none; }
  .hero-image { width: 380px; }
  .footer-main { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .hero-inner { flex-direction: column; min-height: auto; }
  .hero-content { padding: 28px 20px; }
  .hero-image { width: 100%; height: 200px; }
  .hero-title { font-size: 22px; }
  .video-grid { grid-template-columns: 1fr; }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .author-grid { grid-template-columns: 1fr; }
  .help-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr 1fr; gap: 20px; }
  .main-nav { display: none; }
  .header-search { width: 160px; }
  .hero-stats { gap: 16px; }
}
@media (max-width: 480px) {
  .topic-grid { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; }
  .help-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
}

/* ===== 懒加载占位 ===== */
img[data-src] { background: #f0f0f0; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: #f5f5f5; }
::-webkit-scrollbar-thumb { background: #ccc; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #aaa; }

/* ===== 分页 ===== */
.pagination {
  display: flex;
  gap: 6px;
  justify-content: center;
  padding: 20px 0;
}
.page-btn {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}
.page-btn:hover, .page-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ===== 内容详情页 ===== */
.article-content {
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-main);
}
.article-content h2 { font-size: 20px; font-weight: 700; margin: 24px 0 12px; }
.article-content h3 { font-size: 17px; font-weight: 700; margin: 20px 0 10px; }
.article-content p { margin-bottom: 14px; }
.article-content img { border-radius: var(--radius); margin: 16px 0; }

/* ===== 通知/提示 ===== */
.notice {
  background: #fff7e6;
  border: 1px solid #ffd591;
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 13px;
  color: #874d00;
  margin-bottom: 16px;
}
.notice-info {
  background: #e6f7ff;
  border-color: #91d5ff;
  color: #003a8c;
}

/* ===== 表单 ===== */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.form-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s;
  font-family: inherit;
}
.form-input:focus { border-color: var(--primary); }
.form-textarea { min-height: 100px; resize: vertical; }
.form-submit {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 10px 28px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.form-submit:hover { background: var(--primary-dark); }