:root {
  --bg: #f7f5f0;
  --bg-card: #ffffff;
  --ink: #1a1a1a;
  --muted: #5c5c5c;
  --line: #e2ddd3;
  --accent: #0b5fff;
  --accent-soft: #e8efff;
  --code-bg: #f0ebe3;
  --max: 42rem;
  --font: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }

html { font-size: 17px; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(247, 245, 240, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
  max-width: var(--max);
  margin: 0 auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  text-decoration: none;
  color: inherit;
}

.brand-name {
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.05rem;
}

.brand-sub {
  font-size: 0.75rem;
  color: var(--muted);
  font-family: var(--mono);
}

.nav { display: flex; gap: 1.1rem; font-size: 0.92rem; }
.nav a { color: var(--ink); text-decoration: none; }
.nav a:hover { color: var(--accent); }

.hero {
  padding: 2.6rem 0 1.6rem;
  border-bottom: 1px solid var(--line);
}

.hero h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.hero p { margin: 0 0 0.75rem; color: var(--muted); max-width: 36rem; }

.disclaimer {
  display: inline-block;
  font-size: 0.78rem;
  font-family: var(--mono);
  color: #4a5568;
  background: var(--accent-soft);
  padding: 0.25rem 0.55rem;
  border-radius: 4px;
}

.start-box {
  margin: 1.75rem 0;
  padding: 1.1rem 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.start-box h2 {
  margin: 0 0 0.55rem;
  font-size: 1rem;
}

.start-box ul { margin: 0; padding-left: 1.2rem; }
.start-box li { margin: 0.3rem 0; }

.section-title {
  margin: 2rem 0 0.9rem;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.post-list { list-style: none; margin: 0 0 2.5rem; padding: 0; }

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

.post-list a.title {
  display: block;
  font-weight: 650;
  font-size: 1.08rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.015em;
  margin-bottom: 0.25rem;
}

.post-list a.title:hover { color: var(--accent); }

.post-meta {
  font-size: 0.8rem;
  color: var(--muted);
  font-family: var(--mono);
  margin-bottom: 0.35rem;
}

.post-excerpt { margin: 0; color: var(--muted); font-size: 0.95rem; }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.6rem 0 2.4rem;
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer p { margin: 0.35rem 0; }

main.page { padding: 2rem 0 1rem; }

article.post header { margin-bottom: 1.6rem; }

article.post h1 {
  margin: 0 0 0.55rem;
  font-size: clamp(1.45rem, 3.5vw, 1.95rem);
  letter-spacing: -0.03em;
  line-height: 1.25;
}

article.post .lede {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0.75rem 0 0;
}

.prose h2 {
  margin: 2rem 0 0.7rem;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.prose h3 {
  margin: 1.4rem 0 0.5rem;
  font-size: 1.05rem;
}

.prose p { margin: 0.85rem 0; }

.prose ul, .prose ol { margin: 0.7rem 0; padding-left: 1.3rem; }
.prose li { margin: 0.35rem 0; }

.prose code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

.prose pre {
  background: #1e1e1e;
  color: #e8e6e1;
  padding: 1rem 1.1rem;
  border-radius: 8px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.55;
}

.prose pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.prose blockquote {
  margin: 1.1rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 1rem 0;
}

.prose th, .prose td {
  border: 1px solid var(--line);
  padding: 0.5rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

.prose th { background: var(--bg-card); }

.callout {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  margin: 1.2rem 0;
  font-size: 0.95rem;
}

.callout strong { display: block; margin-bottom: 0.25rem; }

.back { display: inline-block; margin-bottom: 1.2rem; font-size: 0.9rem; }

@media (max-width: 560px) {
  .site-header .inner { flex-direction: column; align-items: flex-start; }
  .nav { gap: 0.85rem; }
}