:root {
  --bg: #ffffff;
  --fg: #111827;
  --muted: #6b7280;
  --link: #2563eb;
  --border: #e5e7eb;
  --code-bg: #f3f4f6;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --fg: #e5e7eb;
    --muted: #9ca3af;
    --link: #60a5fa;
    --border: rgba(229, 231, 235, 0.14);
    --code-bg: rgba(229, 231, 235, 0.08);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.65;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 860px; margin: 0 auto; padding: 0 16px; }

.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.6);
  backdrop-filter: blur(10px);
}
@media (prefers-color-scheme: dark) {
  .site-header { background: rgba(11,16,32,0.7); }
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
}

.brand-link { font-weight: 700; letter-spacing: 0.2px; color: var(--fg); }
.nav { display: flex; gap: 12px; flex-wrap: wrap; }
.nav a { color: var(--muted); font-size: 14px; }
.nav a:hover { color: var(--fg); text-decoration: none; }

main.container { padding: 28px 16px 40px; }
.page-title { margin: 0 0 14px; font-size: 22px; }

.post-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; }
.post-item { margin: 0; }
.post-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 16px 14px;
  background: rgba(255,255,255,0.55);
  box-shadow: 0 8px 30px rgba(17,24,39,0.05);
}
@media (prefers-color-scheme: dark) {
  .post-card { background: rgba(11,16,32,0.65); box-shadow: 0 10px 30px rgba(0,0,0,0.22); }
}

.post-card-header { display: grid; gap: 6px; }
.post-title { margin: 0; font-size: 18px; letter-spacing: -0.1px; }
.post-title a { color: var(--fg); }
.post-title a:hover { color: var(--link); text-decoration: none; }
.post-meta { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 13px; flex-wrap: wrap; }
.dot { opacity: 0.7; }
.post-excerpt { margin: 10px 0 0; color: var(--muted); font-size: 14px; }

.tags { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.tag { font-size: 12px; color: var(--muted); border: 1px solid var(--border); padding: 1px 8px; border-radius: 999px; }
.tag:hover { color: var(--fg); text-decoration: none; }

.post-h1 { margin: 0 0 8px; font-size: 28px; letter-spacing: -0.2px; }
.post-content { margin-top: 18px; }
.post-content img { max-width: 100%; height: auto; }
.post-content pre { padding: 12px 14px; overflow: auto; border-radius: 10px; background: var(--code-bg); }
.post-content code { font-family: var(--mono); font-size: 0.92em; }
.post-content :not(pre) > code { background: var(--code-bg); padding: 0.12em 0.35em; border-radius: 6px; }
.post-content blockquote { margin: 14px 0; padding: 4px 12px; border-left: 3px solid var(--border); color: var(--muted); }

.tag-list { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.tag-item a { color: var(--fg); }
.tag-count { color: var(--muted); margin-left: 4px; font-size: 13px; }

.archive-year { margin-top: 22px; }
.archive-year-title { margin: 0 0 10px; font-size: 18px; color: var(--fg); }
.archive-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.archive-item { display: flex; gap: 10px; color: var(--muted); }
.archive-item a { color: var(--fg); }

.site-footer { border-top: 1px solid var(--border); }
.site-footer .container { padding: 18px 16px; color: var(--muted); }