/* 屿沐研学 - 全站样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #1a5bb5;
  --primary-dark: #124a99;
  --accent: #e8b04b;
  --text: #333;
  --text-light: #777;
  --bg: #f5f7fa;
  --border: #e5e9f0;
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 16px; }

/* ===== 顶部通栏 ===== */
.topbar {
  background: var(--primary-dark);
  color: rgba(255,255,255,.85);
  font-size: 12px;
  padding: 6px 0;
}
.topbar .container { display: flex; justify-content: space-between; }

/* ===== 头部 ===== */
.site-header {
  background: #fff;
  border-bottom: 3px solid var(--primary);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.logo-cn {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 2px;
}
.logo-sub {
  font-size: 12px;
  color: var(--text-light);
  letter-spacing: 1px;
}
.main-nav { display: flex; gap: 4px; }
.main-nav a {
  padding: 8px 16px;
  font-size: 16px;
  color: #444;
  border-radius: 4px;
  transition: all .2s;
}
.main-nav a:hover, .main-nav a.active {
  background: var(--primary);
  color: #fff;
}

/* ===== Banner ===== */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #2e7bd6 60%, #4a97e8 100%);
  color: #fff;
  padding: 64px 0;
}
.hero h1 { font-size: 36px; letter-spacing: 3px; margin-bottom: 12px; }
.hero p { font-size: 16px; opacity: .9; max-width: 640px; }
.hero .hero-tags { margin-top: 24px; display: flex; gap: 12px; flex-wrap: wrap; }
.hero .hero-tags span {
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.4);
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 14px;
}

/* ===== 通用板块 ===== */
.section { padding: 40px 0 20px; }
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  border-bottom: 2px solid var(--primary);
  padding-bottom: 10px;
}
.section-head h2 {
  font-size: 22px;
  color: var(--primary);
  padding-left: 12px;
  border-left: 5px solid var(--accent);
}
.section-head .more { font-size: 14px; color: var(--text-light); }
.section-head .more:hover { color: var(--primary); }

/* ===== 频道卡片 ===== */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.channel-card {
  background: #fff;
  border: 1px solid var(--border);
  border-top: 4px solid var(--primary);
  border-radius: 6px;
  padding: 24px 16px;
  text-align: center;
  transition: all .25s;
}
.channel-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(26,91,181,.15);
}
.channel-card .icon { font-size: 32px; margin-bottom: 10px; }
.channel-card h3 { font-size: 17px; margin-bottom: 6px; color: var(--text); }
.channel-card p { font-size: 13px; color: var(--text-light); }

/* ===== 文章列表 ===== */
.news-list { background: #fff; border: 1px solid var(--border); border-radius: 6px; padding: 8px 24px; }
.news-list li {
  padding: 14px 0;
  border-bottom: 1px dashed var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.news-list li:last-child { border-bottom: none; }
.news-list li a { font-size: 15px; color: #444; flex: 1; }
.news-list li a::before { content: "·"; color: var(--primary); margin-right: 8px; font-weight: 700; }
.news-list li a:hover { color: var(--primary); }
.news-list li time { font-size: 13px; color: #aaa; white-space: nowrap; }

.placeholder-note {
  margin-top: 12px;
  font-size: 13px;
  color: #b0b0b0;
  text-align: center;
  padding: 10px;
  background: #fafbfd;
  border-radius: 4px;
}

/* ===== 双栏区 ===== */
.two-col { display: grid; grid-template-columns: 1fr 340px; gap: 24px; margin-top: 20px; }
.side-box { background: #fff; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.side-box .side-title {
  background: var(--primary);
  color: #fff;
  font-size: 16px;
  padding: 10px 18px;
}
.side-box .side-body { padding: 18px; font-size: 14px; color: #555; }
.side-box .side-body p { margin-bottom: 12px; }
.contact-line { display: flex; gap: 8px; align-items: flex-start; margin-bottom: 10px; }
.contact-line .c-icon { color: var(--primary); }

/* ===== 频道页头 ===== */
.page-banner {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  padding: 40px 0;
}
.page-banner h1 { font-size: 28px; letter-spacing: 2px; }
.page-banner .crumb { font-size: 13px; opacity: .8; margin-top: 6px; }
.page-banner .crumb a:hover { text-decoration: underline; }

/* ===== 页脚 ===== */
.site-footer {
  margin-top: 48px;
  background: #24303f;
  color: rgba(255,255,255,.6);
  font-size: 13px;
  padding: 32px 0;
}
.site-footer .container { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.site-footer a { color: rgba(255,255,255,.8); }
.site-footer a:hover { color: #fff; }
.footer-nav { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 8px; }

/* ===== 文章详情页 ===== */
.article-wrap { background: #fff; border: 1px solid var(--border); border-radius: 6px; padding: 36px 42px; margin-top: 24px; }
.article-wrap h1 { font-size: 26px; line-height: 1.4; color: #222; margin-bottom: 12px; }
.article-meta { font-size: 13px; color: #999; padding-bottom: 18px; border-bottom: 1px solid var(--border); margin-bottom: 24px; }
.article-meta span { margin-right: 18px; }
.article-body { font-size: 16px; line-height: 1.9; color: #333; }
.article-body p { margin-bottom: 16px; }
.article-body h2 { font-size: 19px; color: var(--primary); margin: 26px 0 14px; padding-left: 10px; border-left: 4px solid var(--accent); }
.article-body h3 { font-size: 17px; margin: 20px 0 10px; }
.article-body ul, .article-body ol { margin: 0 0 16px 24px; }
.article-body li { margin-bottom: 8px; }
.article-body table { width: 100%; border-collapse: collapse; margin: 16px 0 20px; font-size: 14px; }
.article-body th, .article-body td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; }
.article-body th { background: #f0f4fa; color: var(--primary-dark); }
.article-body strong { color: var(--primary-dark); }
.source-note { font-size: 13px; color: #999; border-top: 1px dashed var(--border); margin-top: 28px; padding-top: 14px; }
.article-footer-banner { margin-top: 28px; text-align: center; }
.article-footer-banner img { max-width: 100%; border-radius: 4px; display: inline-block; }

@media (max-width: 860px) {
  .article-wrap { padding: 22px 18px; }
  .article-wrap h1 { font-size: 21px; }
  .article-body { font-size: 15px; }
  .article-body table { font-size: 13px; display: block; overflow-x: auto; }
}

/* ===== 响应式 ===== */
@media (max-width: 860px) {
  .channel-grid { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; }
  .header-inner { flex-direction: column; height: auto; padding: 12px 0; gap: 8px; }
  .main-nav { flex-wrap: wrap; justify-content: center; }
  .hero h1 { font-size: 26px; }
}