:root {
  --bg: #fbfbfa;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #656d76;
  --border: #e3e1dd;
  --accent: #2f6fed;
  --accent-soft: #eaf1fe;
  --code-bg: #f3f1ee;
  --maxw: 860px;
  --serif: 'Noto Serif SC', 'Georgia', 'Songti SC', serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.hidden { display: none !important; }

/* ---------- index ---------- */
.site-header {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px 20px 24px;
}
.site-header h1 { font-size: 32px; margin: 0 0 8px; }
.lede { color: var(--muted); margin: 0 0 24px; }
.toolbar { display: flex; gap: 10px; align-items: center; }
.toolbar #search {
  flex: 1; padding: 10px 14px; border: 1px solid var(--border);
  border-radius: 10px; font-size: 15px; background: var(--surface); outline: none;
}
.toolbar #search:focus { border-color: var(--accent); }

.post-list { list-style: none; max-width: var(--maxw); margin: 0 auto; padding: 8px 20px 40px; }
.post-list li {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 20px 22px; margin-bottom: 16px; transition: box-shadow .15s, transform .15s;
}
.post-list li:hover { box-shadow: 0 6px 22px rgba(0,0,0,.06); transform: translateY(-1px); }
.post-list a.title { font-size: 20px; font-weight: 600; color: var(--text); text-decoration: none; }
.post-list a.title:hover { color: var(--accent); }
.post-meta { color: var(--muted); font-size: 13px; margin: 6px 0 8px; }
.post-summary { color: #444; font-size: 14.5px; margin: 0 0 12px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: 12px; color: var(--accent); background: var(--accent-soft);
  border-radius: 999px; padding: 2px 10px;
}
.empty { text-align: center; color: var(--muted); padding: 40px; }
.site-footer { max-width: var(--maxw); margin: 0 auto; padding: 20px; color: var(--muted); font-size: 13px; text-align: center; }

/* ---------- buttons ---------- */
.btn {
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  padding: 9px 16px; border-radius: 10px; font-size: 14px; cursor: pointer;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.05); color: #fff; }

/* ---------- post bar ---------- */
.post-bar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; gap: 12px;
  padding: 12px 20px; background: rgba(251,251,250,.9); backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}
.post-bar .back { color: var(--muted); text-decoration: none; font-size: 14px; }
.post-bar .back:hover { color: var(--accent); }
.post-bar .spacer { flex: 1; }
.save-status { font-size: 13px; color: var(--muted); }
.save-status.saving { color: #b8860b; }
.save-status.saved { color: #1a7f37; }

.post-main { max-width: var(--maxw); margin: 0 auto; padding: 24px 20px 80px; }
.editor { display: flex; gap: 16px; margin-top: 8px; }
.editor-pane { flex: 1; min-width: 0; }
.editor textarea {
  width: 100%; height: 70vh; resize: vertical; font-family: ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  font-size: 14px; line-height: 1.7; padding: 16px; border: 1px solid var(--border); border-radius: 12px;
  background: #fcfcfa; color: var(--text); outline: none;
}
.editor textarea:focus { border-color: var(--accent); }
.editor .preview-pane { border: 1px solid var(--border); border-radius: 12px; background: var(--surface); padding: 4px 20px; height: 70vh; overflow: auto; }
@media (max-width: 760px) { .editor { flex-direction: column; } .editor textarea { height: 40vh; } .editor .preview-pane { height: 40vh; } }

/* ---------- markdown body ---------- */
.markdown-body { font-family: var(--serif); font-size: 17px; line-height: 1.9; color: #24292f; word-wrap: break-word; }
.markdown-body h1 { font-size: 30px; text-align: center; margin: 8px 0 4px; }
.markdown-body h2 { font-size: 23px; margin: 44px 0 14px; padding-bottom: 6px; border-bottom: 2px solid var(--border); }
.markdown-body h3 { font-size: 19px; margin: 30px 0 10px; }
.markdown-body h4 { font-size: 16px; margin: 22px 0 8px; }
.markdown-body p { margin: 0 0 16px; }
.markdown-body strong { color: #111; }
.markdown-body blockquote {
  margin: 16px 0; padding: 10px 18px; border-left: 4px solid var(--accent);
  background: var(--accent-soft); color: #345; border-radius: 0 8px 8px 0;
}
.markdown-body ul, .markdown-body ol { padding-left: 26px; margin: 0 0 16px; }
.markdown-body li { margin: 4px 0; }
.markdown-body code {
  font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 85%;
  background: var(--code-bg); padding: .15em .4em; border-radius: 5px;
}
.markdown-body pre { background: #f6f4f1; padding: 16px; border-radius: 10px; overflow: auto; }
.markdown-body pre code { background: none; padding: 0; font-size: 13.5px; }
.markdown-body table { border-collapse: collapse; width: 100%; margin: 18px 0; font-size: 15px; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.markdown-body th { background: #f3f1ee; }
.markdown-body a { color: var(--accent); }
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }
.markdown-body img { max-width: 100%; }

/* ---------- toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%);
  background: #24292f; color: #fff; padding: 12px 18px; border-radius: 10px; font-size: 14px;
  box-shadow: 0 8px 24px rgba(0,0,0,.2); z-index: 50; max-width: 90vw;
}
.toast button { margin-left: 12px; }