:root {
  color-scheme: light dark;
  --max-width: 720px;
  --fg: #1a1a1a;
  --bg: #ffffff;
  --muted: #666666;
  --border: #e2e2e2;
  --accent: #2452ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.55;
}

.site-header,
.site-main,
.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  border-bottom: 1px solid var(--border);
}

.site-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--fg);
  text-decoration: none;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--fg);
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--accent);
}

.site-main {
  min-height: 60vh;
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.post-list {
  list-style: none;
  padding: 0;
}

.post-list li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.post-list h2 {
  margin: 0 0 0.25rem;
}

.post-meta {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0 0 0.5rem;
}

.post-body {
  white-space: pre-wrap;
}

.post-excerpt {
  color: var(--fg);
}

form.post-form {
  display: grid;
  gap: 0.75rem;
  max-width: 480px;
  margin: 1.5rem 0;
}

form.post-form label {
  display: grid;
  gap: 0.25rem;
  font-weight: 600;
}

form.post-form input,
form.post-form textarea {
  font: inherit;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
}

form.post-form textarea {
  min-height: 160px;
  resize: vertical;
}

form.post-form button {
  justify-self: start;
  padding: 0.5rem 1.25rem;
  border: none;
  border-radius: 4px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  cursor: pointer;
}

.error-banner {
  background: #fdecec;
  border: 1px solid #f2b8b5;
  color: #7a1f1f;
  padding: 0.75rem 1rem;
  border-radius: 4px;
  margin-bottom: 1rem;
}