:root {
  --bg: #fafaf9;
  --card: #ffffff;
  --text: #1c1917;
  --muted: #78716c;
  --accent: #0f766e;
  --border: #e7e5e4;
}

/* 系列导航 */
.series-nav { display: flex; justify-content: space-between; gap: 8px; margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--border); }
.series-nav a, .series-nav span { font-size: 13.5px; }
.series-nav a.nav-prev, .series-nav a.nav-next { color: var(--accent); text-decoration: none; padding: 8px 10px; border-radius: 8px; }
.series-nav a.nav-prev:hover, .series-nav a.nav-next:hover { background: #f0fdfa; }
.series-nav .nav-index { color: var(--muted); text-decoration: none; padding: 8px 10px; white-space: nowrap; }
.series-nav .nav-index:hover { color: var(--accent); }

/* 系列索引页 */
.index-page .series-desc { color: var(--muted); margin-bottom: 24px; }
.toc-list { list-style: none; }
.toc-item { display: flex; gap: 14px; padding: 14px 4px; border-bottom: 1px solid var(--border); }
.toc-num { flex-shrink: 0; width: 34px; height: 34px; display: flex; align-items: center; justify-content: center; background: #f0fdfa; color: var(--accent); font-weight: 700; border-radius: 50%; font-size: 14px; }
.toc-item a { font-weight: 700; color: var(--text); text-decoration: none; }
.toc-item a:hover { color: var(--accent); }
.toc-item p { color: var(--muted); font-size: 13.5px; margin-top: 3px; }
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
}
.wrap { max-width: 860px; margin: 0 auto; padding: 0 20px; }
.wrap.narrow { max-width: 680px; }

.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.site-header .wrap { display: flex; justify-content: space-between; align-items: center; height: 60px; }
.logo { font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none; }
nav a { margin-left: 24px; color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--accent); }

.hero { padding: 48px 0 8px; }
.hero h1 { font-size: 28px; margin-bottom: 8px; }
.hero p { color: var(--muted); font-size: 16px; }
.section-title { margin: 40px 0 16px; font-size: 20px; }

.post-list { display: flex; flex-direction: column; gap: 16px; padding-bottom: 60px; }
.post-card {
  display: block; background: var(--card);
  border: 1px solid var(--border); border-radius: 12px;
  padding: 22px 26px; text-decoration: none; color: var(--text);
  transition: box-shadow .2s, transform .2s;
}
.post-card:hover { box-shadow: 0 6px 24px rgba(0,0,0,.08); transform: translateY(-2px); }
.post-title { font-size: 18px; font-weight: 700; margin-bottom: 6px; color: var(--accent); }
.post-excerpt { color: var(--muted); font-size: 14.5px; margin-bottom: 10px; }
.post-meta { color: #a8a29e; font-size: 13px; }

article { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 40px 44px; margin: 32px 0 64px; }
article h1 { font-size: 26px; line-height: 1.4; margin-bottom: 16px; }
.meta-published { color: var(--muted); font-size: 14px; margin-bottom: 6px; }
.source-box {
  background: #f0fdfa; border-left: 4px solid var(--accent);
  padding: 12px 16px; border-radius: 0 8px 8px 0;
  font-size: 14px; color: var(--muted); margin-bottom: 28px;
}
.source-box a { color: var(--accent); word-break: break-all; }

article h2 { font-size: 21px; margin: 34px 0 14px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
article h3 { font-size: 17.5px; margin: 26px 0 10px; }
article p { margin: 12px 0; }
article ul, article ol { margin: 12px 0 12px 26px; }
article li { margin: 4px 0; }
article blockquote {
  border-left: 4px solid #d6d3d1; background: #fafaf9;
  margin: 16px 0; padding: 10px 18px; color: var(--muted); border-radius: 0 8px 8px 0;
}
article code {
  background: #f5f5f4; border: 1px solid var(--border);
  padding: 1px 6px; border-radius: 5px; font-size: 13.5px;
  font-family: ui-monospace, "SF Mono", Consolas, monospace;
}
article pre {
  background: #1c1917; color: #fafaf9;
  border-radius: 10px; overflow-x: auto;
  padding: 18px 20px; margin: 16px 0; font-size: 13.5px; line-height: 1.6;
}
article pre code { background: none; border: none; color: inherit; padding: 0; }
article table { border-collapse: collapse; width: 100%; margin: 16px 0; font-size: 14px; }
article th, article td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
article th { background: #f5f5f4; }
article img { max-width: 100%; border-radius: 8px; }
article a { color: var(--accent); }

.site-footer { border-top: 1px solid var(--border); padding: 24px 0; color: #a8a29e; font-size: 13.5px; text-align: center; }

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  article { padding: 26px 18px; margin: 20px 0 48px; }
  .hero { padding-top: 32px; }
  .hero h1 { font-size: 22px; }
  article h1 { font-size: 21px; }
  article h2 { font-size: 18.5px; margin: 26px 0 10px; }
  article h3 { font-size: 16px; }
  nav a { margin-left: 14px; font-size: 14px; }
  .post-card { padding: 16px 18px; }
  .post-title { font-size: 16.5px; }
  /* 长表格横向滚动，不撑破布局 */
  article table { display: block; overflow-x: auto; white-space: nowrap; -webkit-overflow-scrolling: touch; }
  /* 代码块不换行 + 缩小字号 */
  article pre { font-size: 12px; padding: 14px 16px; -webkit-overflow-scrolling: touch; }
  /* 图片点击可放大查看 */
  article img { border-radius: 6px; }
}
@media (max-width: 400px) {
  body { font-size: 15px; }
  article { padding: 20px 14px; }
}

/* 合集页目录 */
.series-toc { background: #f0fdfa; border-left: 4px solid var(--accent); border-radius: 0 8px 8px 0; padding: 16px 20px; margin-bottom: 28px; font-size: 14.5px; }
.page-toc { list-style: none; margin-top: 8px; }
.page-toc li { padding: 3px 0; }
.page-toc a { color: var(--accent); text-decoration: none; }
.page-toc a:hover { text-decoration: underline; }

/* ── 互动组件 ── */
.ix-bar { display: flex; align-items: center; gap: 12px; margin: 30px 0 8px; padding-top: 18px; border-top: 2px solid var(--border); flex-wrap: wrap; }
.ix-btn { background: var(--card); border: 1.5px solid var(--border); border-radius: 20px; padding: 7px 16px; cursor: pointer; font-size: 14px; color: var(--text); transition: all .15s; font-family: inherit; }
.ix-btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.ix-btn.active { border-color: #e11d48; background: #fff1f2; color: #e11d48; font-weight: 600; }
.ix-btn span { font-weight: 600; }
.ix-user { color: var(--muted); font-size: 13.5px; margin-left: auto; }
.ix-user a { color: var(--accent); }
.ix-login-tip { background: #fefce8; border: 1px solid #fde047; padding: 6px 12px; border-radius: 8px; font-size: 13.5px; color: var(--text); margin-left: auto; }

.ix-comments { margin-top: 14px; background: #fafaf9; border-radius: 10px; padding: 16px 18px; }
.ix-empty { color: var(--muted); font-size: 14px; }
.ix-comment { padding: 10px 0; border-bottom: 1px dashed var(--border); }
.ix-comment b { font-size: 14px; color: var(--accent); }
.ix-time { color: #a8a29e; font-size: 12px; margin-left: 8px; }
.ix-comment p { margin: 5px 0 0; font-size: 14.5px; }
.ix-cform { margin-top: 14px; }
.ix-cform textarea { width: 100%; min-height: 70px; border: 1.5px solid var(--border); border-radius: 10px; padding: 10px 12px; font-size: 14.5px; resize: vertical; font-family: inherit; box-sizing: border-box; }
.ix-cform button { float: right; margin-top: 8px; background: var(--accent); color: #fff; border: none; border-radius: 18px; padding: 8px 20px; cursor: pointer; font-size: 14px; }
.ix-cform button:hover { opacity: .9; }

/* 标签 */
.tag-chips { display: inline-flex; gap: 6px; flex-wrap: wrap; vertical-align: middle; }
.tag-chip { display: inline-block; background: #ecfdf5; color: #047857; font-size: 12px; padding: 2px 10px; border-radius: 10px; border: 1px solid #a7f3d0; }

/* 登录页 */
.auth-box { max-width: 380px; margin: 40px auto; background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 30px; }
.auth-tabs { display: flex; margin-bottom: 22px; border-bottom: 2px solid var(--border); }
.auth-tab { flex: 1; text-align: center; padding: 10px; cursor: pointer; color: var(--muted); font-weight: 600; }
.auth-tab.on { color: var(--accent); border-bottom: 2px solid var(--accent); margin-bottom: -2px; }
.auth-form input { width: 100%; padding: 11px 13px; margin-bottom: 12px; border: 1.5px solid var(--border); border-radius: 10px; font-size: 15px; box-sizing: border-box; }
.auth-form button { width: 100%; padding: 12px; background: var(--accent); color: #fff; border: none; border-radius: 10px; font-size: 15.5px; cursor: pointer; }
.auth-msg { font-size: 13.5px; min-height: 20px; margin: 4px 0 10px; }
.auth-msg.ok { color: #059669; } .auth-msg.err { color: #dc2626; }