/* 清源技术笔记 - 基础样式（纯本地资源，无外部 CDN 依赖） */

:root {
  --ink: #1f2328;
  --ink-soft: #59636e;
  --line: #e5e7eb;
  --bg: #f7f8fa;
  --card: #ffffff;
  --link: #205ea6;
  --max: 860px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei",
               "PingFang SC", "Hiragino Sans GB", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

/* 头部 */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
  flex-wrap: wrap;
  gap: 8px;
}

.brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.5px;
}

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  margin-left: 18px;
  font-size: 15px;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--link);
}

.site-nav a.active {
  font-weight: 600;
}

/* 主体 */
main {
  padding: 32px 0 8px;
}

.hero {
  padding: 12px 0 26px;
}

.hero h1 {
  font-size: 28px;
  margin: 0 0 12px;
  letter-spacing: 0.5px;
}

.lead {
  color: var(--ink-soft);
  margin: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px 24px;
  margin-bottom: 22px;
}

.card h2 {
  font-size: 18px;
  margin: 0 0 14px;
  padding-left: 10px;
  border-left: 3px solid var(--link);
}

.article h1 {
  font-size: 24px;
  margin: 0 0 18px;
}

.article h2 {
  font-size: 17px;
  margin: 26px 0 10px;
  padding-left: 10px;
  border-left: 3px solid var(--link);
}

.article p,
.article li {
  color: #333b44;
}

.note {
  color: var(--ink-soft);
  font-size: 14px;
  background: #f1f3f6;
  border-radius: 6px;
  padding: 10px 14px;
}

/* 列表 */
.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}

.post-list li:last-child {
  border-bottom: none;
}

.post-list a {
  color: var(--ink);
  text-decoration: none;
}

.post-list a:hover {
  color: var(--link);
  text-decoration: underline;
}

.meta {
  color: #8b949e;
  font-size: 14px;
  white-space: nowrap;
}

.more {
  margin: 14px 0 0;
  font-size: 15px;
}

a { color: var(--link); }

/* 页脚 */
.site-footer {
  margin-top: 34px;
  padding: 22px 0 30px;
  border-top: 1px solid var(--line);
  color: #8b949e;
  font-size: 14px;
}

.site-footer p {
  margin: 4px 0;
}

.beian a {
  color: #8b949e;
  text-decoration: none;
}

.beian a:hover {
  text-decoration: underline;
}

.beian-icon {
  width: 16px;
  height: 18px;
  vertical-align: -3px;
  margin-right: 4px;
}

/* 移动端 */
@media (max-width: 560px) {
  .hero h1 { font-size: 23px; }
  .site-nav a { margin-left: 12px; font-size: 14px; }
  .card { padding: 18px 16px; }
  .post-list li { flex-direction: column; gap: 2px; }
}