:root {
  --bg: #0f1115;
  --surface: #171a21;
  --surface-2: #1f2430;
  --text: #e8eaf0;
  --text-dim: #9aa2b1;
  --accent: #6ee7b7;
  --accent-2: #60a5fa;
  --border: #2a2f3a;
  --radius: 14px;
  --max-width: 780px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Noto Sans JP", "Segoe UI", system-ui, sans-serif;
  line-height: 1.8;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  padding: 40px 0 28px;
  background: linear-gradient(135deg, var(--surface), var(--surface-2));
  border-bottom: 1px solid var(--border);
}

.brand {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tagline {
  color: var(--text-dim);
  margin: 8px 0 0;
  font-size: 0.95rem;
}

.content { padding: 40px 0; min-height: 50vh; }

.post-card {
  padding: 22px;
  margin-bottom: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.post-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-2);
}

.post-card h2 { margin: 0 0 6px; font-size: 1.15rem; }
.post-card h2 a { color: var(--text); text-decoration: none; }
.post-card h2 a:hover { color: var(--accent-2); }

.meta { color: var(--text-dim); font-size: 0.85rem; margin: 0 0 10px; }
.excerpt { color: var(--text-dim); margin: 0 0 10px; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: 0.78rem;
  color: var(--accent);
  background: rgba(110, 231, 183, 0.08);
  border: 1px solid rgba(110, 231, 183, 0.25);
  border-radius: 999px;
  padding: 3px 10px;
}

.post h1 { font-size: 1.8rem; line-height: 1.4; margin-bottom: 6px; }
.post-body h2 {
  font-size: 1.3rem;
  margin-top: 2em;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.post-body h3 { font-size: 1.1rem; margin-top: 1.6em; color: var(--accent-2); }
.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2em 0;
  font-size: 0.92rem;
}
.post-body th, .post-body td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}
.post-body th { background: var(--surface-2); }
.post-body code {
  background: var(--surface-2);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.9em;
}
.post-body a { color: var(--accent-2); }

.back-link { margin-top: 2.5em; }
.back-link a { color: var(--text-dim); text-decoration: none; }
.back-link a:hover { color: var(--accent-2); }

.ad-slot { padding: 10px 0 0; min-height: 1px; }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 40px;
  color: var(--text-dim);
  font-size: 0.82rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 16px;
}

.footer-nav a {
  color: var(--text-dim);
  text-decoration: none;
}

.footer-nav a:hover { color: var(--accent-2); }

.static-page .post-body h2 { margin-top: 1.6em; }
.static-page .post-body ul { padding-left: 1.2em; }
.static-page .post-body li { margin-bottom: 0.4em; }