:root {
  --bg: #fafaf9;
  --bg-elevated: #ffffff;
  --border: #e7e5e4;
  --border-strong: #d6d3d1;
  --text: #1c1917;
  --text-muted: #57534e;
  --text-faint: #a8a29e;
  --accent: #16a34a;
  --accent-soft: #dcfce7;
  --accent-hover: #15803d;
  --code-bg: #f5f5f4;
  --shadow: 0 1px 2px rgba(0,0,0,0.04);
  --radius: 8px;
}
[data-theme="dark"] {
  --bg: #0c0a09;
  --bg-elevated: #1c1917;
  --border: #292524;
  --border-strong: #44403c;
  --text: #fafaf9;
  --text-muted: #a8a29e;
  --text-faint: #78716c;
  --accent: #4ade80;
  --accent-soft: #14532d;
  --accent-hover: #86efac;
  --code-bg: #1c1917;
  --shadow: 0 1px 2px rgba(0,0,0,0.3);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  transition: background 0.2s ease, color 0.2s ease;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 720px; margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 10;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; }
.brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--text);
  font-weight: 700; font-size: 17px; letter-spacing: -0.01em;
}
.brand-mark {
  width: 22px; height: 22px;
  display: grid; grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 1fr); gap: 2px;
}
.brand-mark span { background: var(--accent); border-radius: 1px; }
.brand-mark span:nth-child(2),
.brand-mark span:nth-child(4),
.brand-mark span:nth-child(6),
.brand-mark span:nth-child(8) { opacity: 0.45; }

.site-nav { display: flex; align-items: center; gap: 22px; }
.site-nav a { color: var(--text-muted); text-decoration: none; font-size: 14px; font-weight: 500; transition: color 0.15s; }
.site-nav a:hover { color: var(--text); }
.theme-toggle {
  background: transparent; border: 1px solid var(--border);
  color: var(--text-muted); width: 32px; height: 32px;
  border-radius: 6px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s;
}
.theme-toggle:hover { border-color: var(--border-strong); color: var(--text); }
.theme-toggle svg { width: 16px; height: 16px; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: none; }

/* Hero */
.hero { padding: 64px 0 32px; }
.hero h1 { font-size: 32px; font-weight: 700; letter-spacing: -0.025em; margin-bottom: 12px; line-height: 1.2; }
.hero p { color: var(--text-muted); font-size: 17px; max-width: 540px; }
.hero .meta-line { margin-top: 16px; font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--text-faint); }
.hero .meta-line .blink { color: var(--accent); animation: blink 1.4s ease-in-out infinite; }
@keyframes blink { 50% { opacity: 0.2; } }

/* Tag cloud */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 36px; padding-top: 12px; border-top: 1px solid var(--border); }
.tag {
  font-family: 'JetBrains Mono', monospace; font-size: 12px;
  padding: 3px 10px; border: 1px solid var(--border); border-radius: 999px;
  color: var(--text-muted); text-decoration: none; transition: all 0.15s;
  cursor: pointer; background: transparent;
}
.tag:hover { border-color: var(--accent); color: var(--accent); }
.tag.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-hover); }
[data-theme="dark"] .tag.active { color: var(--accent); }
.tag .count { color: var(--text-faint); margin-left: 4px; }

/* Post list */
.post-list { list-style: none; }
.post-item { padding: 22px 0; border-bottom: 1px solid var(--border); transition: padding 0.2s ease; }
.post-item:last-child { border-bottom: none; }
.post-item:hover { padding-left: 4px; }
.post-meta {
  display: flex; align-items: center; gap: 10px; margin-bottom: 8px;
  font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--text-faint);
  flex-wrap: wrap;
}
.badge {
  font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 500;
  padding: 2px 8px; border-radius: 4px; letter-spacing: 0.02em; text-transform: uppercase;
}
.badge-project { background: var(--accent-soft); color: var(--accent-hover); }
[data-theme="dark"] .badge-project { color: var(--accent); }
.badge-note { background: transparent; border: 1px solid var(--border-strong); color: var(--text-muted); }
.badge-log { background: transparent; border: 1px dashed var(--border-strong); color: var(--text-muted); }
.post-item h2 { font-size: 19px; font-weight: 600; letter-spacing: -0.015em; margin-bottom: 6px; line-height: 1.35; }
.post-item h2 a { color: var(--text); text-decoration: none; }
.post-item h2 a:hover { color: var(--accent); }
.post-excerpt { color: var(--text-muted); font-size: 15px; margin-bottom: 10px; }
.post-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.post-tags .tag { font-size: 11px; padding: 1px 8px; }
.read-time::before { content: "·"; margin-right: 10px; }

/* Article */
.post { padding: 24px 0 64px; }
.post .post-header { margin-bottom: 32px; }
.post h1 { font-size: 32px; font-weight: 700; letter-spacing: -0.025em; margin: 8px 0 12px; line-height: 1.2; }
.post .post-meta { margin-bottom: 14px; }
.post .post-tags { margin-top: 14px; }
.post p { margin-bottom: 18px; color: var(--text); font-size: 16px; }
.post h2 { font-size: 22px; font-weight: 600; letter-spacing: -0.015em; margin: 36px 0 14px; }
.post h3 { font-size: 18px; font-weight: 600; margin: 28px 0 10px; }
.post a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
.post a:hover { color: var(--accent-hover); }
.post code {
  font-family: 'JetBrains Mono', monospace; font-size: 0.88em;
  background: var(--code-bg); padding: 2px 6px; border-radius: 4px; border: 1px solid var(--border);
}
.post pre {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; overflow-x: auto; margin-bottom: 18px; font-size: 13px; line-height: 1.55;
}
.post pre code { background: transparent; border: none; padding: 0; font-size: inherit; }
.post blockquote { border-left: 3px solid var(--accent); padding: 4px 0 4px 16px; margin: 18px 0; color: var(--text-muted); font-style: italic; }
.post figure { margin: 28px 0; }
.post img { width: 100%; border-radius: var(--radius); border: 1px solid var(--border); display: block; }
.post figcaption { font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--text-faint); text-align: center; margin-top: 8px; }
.post ul, .post ol { margin: 0 0 18px 22px; color: var(--text); }
.post li { margin-bottom: 6px; }

/* PrismJS token colors */
.token.comment, .token.prolog, .token.doctype, .token.cdata { color: var(--text-faint); font-style: italic; }
.token.keyword, .token.boolean, .token.tag { color: #9333ea; }
[data-theme="dark"] .token.keyword, [data-theme="dark"] .token.boolean, [data-theme="dark"] .token.tag { color: #c084fc; }
.token.string, .token.char, .token.attr-value { color: var(--accent-hover); }
[data-theme="dark"] .token.string, [data-theme="dark"] .token.char, [data-theme="dark"] .token.attr-value { color: var(--accent); }
.token.function, .token.class-name { color: #2563eb; }
[data-theme="dark"] .token.function, [data-theme="dark"] .token.class-name { color: #60a5fa; }
.token.number, .token.operator, .token.punctuation { color: var(--text-muted); }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 32px 0; margin-top: 48px; font-size: 13px; color: var(--text-faint); }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.footer-links { display: flex; gap: 18px; }
.footer-links a { color: var(--text-muted); text-decoration: none; transition: color 0.15s; }
.footer-links a:hover { color: var(--accent); }

@media (max-width: 540px) {
  .hero h1 { font-size: 26px; }
  .post h1 { font-size: 26px; }
  .site-nav { gap: 14px; }
  .site-nav a { font-size: 13px; }
}
.badge-draft {
  background: transparent;
  border: 1px dashed #f59e0b;
  color: #b45309;
}
[data-theme="dark"] .badge-draft {
  border-color: #fbbf24;
  color: #fbbf24;
}