/* ===== 云栖书院 - 个人学习网站 样式 ===== */
:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --text: #2c3e50;
  --text-light: #6b7a8d;
  --bg: #f7f9fc;
  --card-bg: #ffffff;
  --border: #e4e9f0;
  --accent: #00b894;
}

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

/* ===== 导航 ===== */
.site-header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: 1px;
}
.logo span { color: var(--accent); }
.nav-links { display: flex; gap: 24px; }
.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-size: 15px;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  transition: all .2s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* ===== 主体 ===== */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 30px 20px 60px;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #1a73e8 0%, #00b894 100%);
  color: #fff;
  border-radius: 12px;
  padding: 48px 36px;
  margin-bottom: 36px;
}
.hero h1 { font-size: 32px; margin-bottom: 12px; }
.hero p { font-size: 16px; opacity: .92; max-width: 640px; }

/* 区块标题 */
.section-title {
  font-size: 20px;
  margin: 32px 0 16px;
  padding-left: 12px;
  border-left: 4px solid var(--primary);
}

/* 卡片网格 */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  transition: transform .2s, box-shadow .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 6px 18px rgba(26, 115, 232, .12); }
.card h3 { font-size: 16px; margin-bottom: 8px; }
.card h3 a { color: var(--text); text-decoration: none; }
.card h3 a:hover { color: var(--primary); }
.card p { font-size: 14px; color: var(--text-light); }
.card .meta { margin-top: 10px; font-size: 12px; color: var(--text-light); }

/* 标签 */
.tag {
  display: inline-block;
  background: rgba(26, 115, 232, .1);
  color: var(--primary);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 12px;
  margin-right: 6px;
}

/* 文章列表 */
.article-list { list-style: none; }
.article-list li {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 22px;
  margin-bottom: 14px;
  transition: box-shadow .2s;
}
.article-list li:hover { box-shadow: 0 4px 14px rgba(26, 115, 232, .1); }
.article-list h2 { font-size: 17px; margin-bottom: 6px; }
.article-list h2 a { color: var(--text); text-decoration: none; }
.article-list h2 a:hover { color: var(--primary); }
.article-list p { font-size: 14px; color: var(--text-light); }

/* 文章正文 */
.article-body {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
}
.article-body h1 { font-size: 24px; margin-bottom: 8px; }
.article-body .meta { color: var(--text-light); font-size: 13px; margin-bottom: 24px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.article-body h2 { font-size: 19px; margin: 24px 0 12px; }
.article-body h3 { font-size: 16px; margin: 18px 0 10px; }
.article-body p { margin-bottom: 14px; }
.article-body ul, .article-body ol { margin: 0 0 14px 22px; }
.article-body code {
  background: #f1f3f5;
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 13px;
}
.article-body pre {
  background: #282c34;
  color: #e6e6e6;
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  margin-bottom: 14px;
  font-size: 13px;
}

/* 关于页 */
.about-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
}
.about-card h2 { font-size: 20px; margin: 24px 0 12px; }
.about-card h2:first-child { margin-top: 0; }
.about-card p { margin-bottom: 12px; }
.about-card ul { margin: 0 0 12px 22px; }
.about-card li { margin-bottom: 6px; }

/* ===== 页脚 ===== */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--card-bg);
  text-align: center;
  padding: 24px 20px;
  color: var(--text-light);
  font-size: 13px;
}
.site-footer a { color: var(--text-light); text-decoration: none; }
.site-footer a:hover { color: var(--primary); }

/* 空状态 */
.empty { text-align: center; color: var(--text-light); padding: 40px 0; }

/* 响应式 */
@media (max-width: 640px) {
  .nav { flex-direction: column; height: auto; padding: 12px 20px; gap: 8px; }
  .hero { padding: 32px 24px; }
  .hero h1 { font-size: 24px; }
}