:root {
  --bg:        #0d1117;
  --bg-card:   #161b22;
  --border:    #21262d;
  --text:      #c9d1d9;
  --text-dim:  #8b949e;
  --accent:    #58a6ff;
  --accent-2:  #3fb950;
  --code-bg:   #161b22;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

/* ── Layout ───────────────────────────────────────────────── */

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 0;
}

.site-header .inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

.site-title span {
  color: var(--accent-2);
}

nav a {
  color: var(--text-dim);
  font-size: 0.875rem;
  margin-left: 1.5rem;
}

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

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

/* ── Home ─────────────────────────────────────────────────── */

.hero {
  margin-bottom: 3.5rem;
}

.hero h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: #e6edf3;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.hero p {
  color: var(--text-dim);
  font-size: 1rem;
  max-width: 520px;
}

.hero .tags {
  margin-top: 1rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--accent-2);
  background: rgba(63, 185, 80, 0.1);
  border: 1px solid rgba(63, 185, 80, 0.2);
  padding: 0.2rem 0.6rem;
  border-radius: 2rem;
}

.section-label {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

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

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

.post-list li:last-child { border-bottom: none; }

.post-list .post-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: #e6edf3;
  display: block;
  margin-bottom: 0.25rem;
}

.post-list .post-title:hover { color: var(--accent); text-decoration: none; }

.post-list .post-meta {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.post-list .post-excerpt {
  margin-top: 0.4rem;
  font-size: 0.9rem;
  color: var(--text-dim);
}

/* ── Post ─────────────────────────────────────────────────── */

.post-header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.post-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: #e6edf3;
  letter-spacing: -0.03em;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.post-header .meta {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
}

.post-content h2 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #e6edf3;
  margin: 2.5rem 0 0.75rem;
  letter-spacing: -0.02em;
}

.post-content h3 {
  font-size: 1rem;
  font-weight: 600;
  color: #e6edf3;
  margin: 2rem 0 0.5rem;
}

.post-content p { margin-bottom: 1.25rem; }

.post-content ul,
.post-content ol {
  margin: 0 0 1.25rem 1.5rem;
}

.post-content li { margin-bottom: 0.35rem; }

.post-content strong { color: #e6edf3; font-weight: 600; }

.post-content em { color: var(--text-dim); }

.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 1rem;
  margin: 1.5rem 0;
  color: var(--text-dim);
  font-style: italic;
}

/* ── Code ─────────────────────────────────────────────────── */

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--code-bg);
  color: #79c0ff;
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--border);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: #e6edf3;
  font-size: 0.85rem;
  line-height: 1.6;
}

/* Rouge syntax — GitHub dark palette */
.highlight .k  { color: #ff7b72; }   /* keyword */
.highlight .kd { color: #ff7b72; }
.highlight .kn { color: #ff7b72; }
.highlight .s  { color: #a5d6ff; }   /* string */
.highlight .s1 { color: #a5d6ff; }
.highlight .s2 { color: #a5d6ff; }
.highlight .c  { color: #8b949e; font-style: italic; } /* comment */
.highlight .c1 { color: #8b949e; font-style: italic; }
.highlight .n  { color: #e6edf3; }
.highlight .nf { color: #d2a8ff; }   /* function */
.highlight .nc { color: #ffa657; }   /* class/type */
.highlight .mi { color: #79c0ff; }   /* integer */
.highlight .mf { color: #79c0ff; }
.highlight .o  { color: #ff7b72; }   /* operator */
.highlight .p  { color: #e6edf3; }   /* punctuation */
.highlight .nl { color: #3fb950; }   /* label */
.highlight .na { color: #79c0ff; }

/* ── Footer ───────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: 4rem;
}

.site-footer .inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.site-footer a { color: var(--text-dim); }
.site-footer a:hover { color: var(--accent); }

/* ── Responsive ───────────────────────────────────────────── */

@media (max-width: 600px) {
  .site-header .inner { flex-direction: column; gap: 0.75rem; align-items: flex-start; }
  nav a:first-child { margin-left: 0; }
  .post-header h1 { font-size: 1.4rem; }
  .hero h1 { font-size: 1.4rem; }
  .site-footer .inner { flex-direction: column; gap: 0.5rem; }
}