:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --border: #e5e7eb;
  --tag-bg: #eef2ff;
  --tag-text: #4338ca;
  --danger: #dc2626;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}
.container { max-width: 860px; margin: 0 auto; padding: 0 18px; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-size: 20px; font-weight: 700; color: var(--text); }
.brand:hover { text-decoration: none; }
.nav a { margin-left: 18px; color: var(--muted); font-size: 15px; }
.nav a:hover { color: var(--primary); text-decoration: none; }

/* Footer */
.site-footer { margin-top: 48px; padding: 24px 0; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 13px; text-align: center; }

.loading { padding: 60px 0; text-align: center; color: var(--muted); }

/* Article list */
.hero { padding: 36px 0 8px; }
.hero h1 { font-size: 28px; margin: 0 0 6px; }
.hero p { color: var(--muted); margin: 0; }
.post-list { display: flex; flex-direction: column; gap: 20px; margin-top: 24px; }
.post-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; display: flex; gap: 16px; box-shadow: var(--shadow); transition: .15s;
}
.post-card:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(0,0,0,.08); }
.post-card .cover { width: 200px; min-width: 200px; height: 150px; object-fit: cover; background: #eef; }
.post-card .body { padding: 16px 18px 16px 0; flex: 1; }
.post-card h2 { margin: 0 0 8px; font-size: 19px; }
.post-card .summary { color: var(--muted); font-size: 14px; margin: 0 0 10px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.meta { font-size: 13px; color: var(--muted); display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.tag { display: inline-block; background: var(--tag-bg); color: var(--tag-text); font-size: 12px;
  padding: 2px 9px; border-radius: 999px; }
.tag:hover { text-decoration: none; opacity: .85; }

.load-more { display: block; margin: 28px auto; padding: 10px 26px; border: 1px solid var(--border);
  background: var(--card); border-radius: 999px; cursor: pointer; color: var(--text); font-size: 14px; }
.load-more:hover { border-color: var(--primary); color: var(--primary); }

/* Detail */
.article { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 30px; margin-top: 24px; box-shadow: var(--shadow); }
.article h1 { font-size: 30px; margin: 0 0 10px; }
.article .cover-full { width: 100%; max-height: 380px; object-fit: cover; border-radius: 10px; margin: 12px 0 20px; }
.markdown { font-size: 16px; }
.markdown h1, .markdown h2, .markdown h3 { margin: 1.4em 0 .6em; line-height: 1.3; }
.markdown img { max-width: 100%; border-radius: 8px; }
.markdown pre { background: #f6f8fa; padding: 14px 16px; border-radius: 8px; overflow: auto; }
.markdown code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 14px; }
.markdown :not(pre) > code { background: #eef1f5; padding: 2px 6px; border-radius: 5px; }
.markdown blockquote { border-left: 4px solid var(--border); margin: 1em 0; padding: 4px 16px; color: var(--muted); }
.markdown table { border-collapse: collapse; width: 100%; margin: 1em 0; }
.markdown th, .markdown td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.markdown th { background: #f6f8fa; }

/* Tags page */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.tag-cloud .tag { font-size: 14px; padding: 6px 14px; }

/* About */
.about { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px; margin-top: 24px; box-shadow: var(--shadow); }
.about .avatar { width: 96px; height: 96px; border-radius: 50%; object-fit: cover; margin-bottom: 14px; }
.about h1 { margin: 0 0 8px; }
.about .bio { color: var(--text); white-space: pre-wrap; }
.social-links { display: flex; gap: 14px; margin-top: 16px; flex-wrap: wrap; }
.social-links a { background: var(--tag-bg); color: var(--tag-text); padding: 6px 14px; border-radius: 999px; font-size: 14px; }

/* Admin */
.admin-wrap { margin-top: 24px; }
.auth-box { max-width: 360px; margin: 60px auto; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.auth-box h2 { margin-top: 0; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.field input[type=text], .field input[type=email], .field input[type=password], .field textarea, .field select {
  width: 100%; padding: 9px 11px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px;
  font-family: inherit; background: #fff; color: var(--text);
}
.field textarea { min-height: 220px; resize: vertical; font-family: ui-monospace, Menlo, monospace; line-height: 1.6; }
.btn { display: inline-block; padding: 9px 18px; border: none; border-radius: 8px; cursor: pointer;
  font-size: 14px; background: var(--primary); color: #fff; }
.btn:hover { background: var(--primary-dark); }
.btn.ghost { background: #fff; color: var(--text); border: 1px solid var(--border); }
.btn.ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn.danger { background: var(--danger); }
.btn.small { padding: 5px 12px; font-size: 13px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.admin-toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; gap: 10px; }
.admin-table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; }
.admin-table th, .admin-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; font-size: 14px; }
.admin-table th { background: #f6f8fa; }
.badge { font-size: 12px; padding: 2px 8px; border-radius: 999px; }
.badge.pub { background: #dcfce7; color: #166534; }
.badge.draft { background: #fef3c7; color: #92400e; }
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.45); display: flex; align-items: flex-start;
  justify-content: center; padding: 30px 12px; overflow: auto; z-index: 100; }
.modal-box { background: #fff; width: 100%; max-width: 820px; border-radius: 12px; padding: 22px 24px; }
.modal-box h2 { margin-top: 0; }
.tags-pick { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }
.tags-pick label { display: inline-flex; align-items: center; gap: 5px; background: #f3f4f6; padding: 4px 10px;
  border-radius: 999px; font-size: 13px; cursor: pointer; }
.preview { border: 1px dashed var(--border); border-radius: 8px; padding: 14px; margin-top: 8px; min-height: 80px;
  background: #fafafa; }
.preview h1,.preview h2,.preview h3 { margin: .6em 0 .4em; }
.attachment-list { margin-top: 8px; font-size: 13px; }
.attachment-list a { margin-right: 14px; }
.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tabs button { padding: 7px 16px; border: 1px solid var(--border); background: #fff; border-radius: 8px;
  cursor: pointer; font-size: 14px; }
.tabs button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); background: #111827;
  color: #fff; padding: 10px 18px; border-radius: 8px; font-size: 14px; opacity: 0; transition: .2s; z-index: 200; }
.toast.show { opacity: 1; }
.muted { color: var(--muted); }
.section-title { font-size: 22px; margin: 0 0 4px; }