/* sergyenko.com — minimal light theme for long-form reading */
:root {
  --bg: #fdfdfb;
  --text: #1f2328;
  --muted: #6b7076;
  --accent: #1a5fb4;
  --rule: #e4e4e0;
  --code-bg: #f3f3ef;
  --serif: Charter, "Iowan Old Style", Georgia, Cambria, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { font-size: 18px; -webkit-text-size-adjust: 100%; }

body {
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  max-width: 700px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

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

/* header */
.site-header { margin-bottom: 3rem; padding-bottom: 1.25rem; border-bottom: 1px solid var(--rule); }
.site-title { font-family: var(--sans); font-size: 1.5rem; font-weight: 700; color: var(--text); letter-spacing: -0.01em; }
.site-title:hover { text-decoration: none; color: var(--accent); }
.site-subtitle { margin: 0.25rem 0 0.75rem; color: var(--muted); font-style: italic; }
.site-nav { font-family: var(--sans); font-size: 0.9rem; }
.site-nav a { margin-right: 1.25rem; color: var(--muted); }
.site-nav a:hover { color: var(--accent); }

/* index */
.post-item { margin-bottom: 2.25rem; }
.post-item time { font-family: var(--sans); font-size: 0.85rem; color: var(--muted); }
.post-item h2 { margin: 0.15rem 0 0.35rem; font-size: 1.35rem; line-height: 1.3; }
.post-item h2 a { color: var(--text); }
.post-item h2 a:hover { color: var(--accent); }
.post-item p { margin: 0; color: #444; }
.muted { color: var(--muted); }

/* post */
.post-header { margin-bottom: 2rem; }
.post-header h1 { margin: 0 0 0.5rem; font-size: 2rem; line-height: 1.2; letter-spacing: -0.01em; }
.post-meta { margin: 0; font-family: var(--sans); font-size: 0.85rem; color: var(--muted); }
.tags { list-style: none; margin: 0.5rem 0 0; padding: 0; font-family: var(--sans); font-size: 0.8rem; }
.tags li { display: inline-block; margin: 0 0.5rem 0.25rem 0; padding: 0.1rem 0.55rem; border: 1px solid var(--rule); border-radius: 999px; color: var(--muted); }
.draft, .draft-note { font-family: var(--sans); font-size: 0.75rem; color: #a4581d; }
.draft { margin-left: 0.5rem; padding: 0.05rem 0.45rem; border: 1px solid #e3b58c; border-radius: 999px; vertical-align: middle; }
.draft-note { margin: 0.75rem 0 0; }

.post-content h2, .post-content h3 { line-height: 1.3; margin: 2rem 0 0.75rem; letter-spacing: -0.01em; }
.post-content h2 { font-size: 1.45rem; }
.post-content h3 { font-size: 1.15rem; }
.post-content p, .post-content ul, .post-content ol { margin: 0 0 1.25rem; }
.post-content li { margin-bottom: 0.35rem; }
.post-content img { max-width: 100%; height: auto; }
.post-content blockquote { margin: 1.5rem 0; padding: 0 0 0 1.25rem; border-left: 3px solid var(--rule); color: #444; }
.post-content hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }
.post-content code { font-family: var(--mono); font-size: 0.85em; background: var(--code-bg); padding: 0.1em 0.35em; border-radius: 4px; }
.post-content pre { background: var(--code-bg); padding: 1rem; overflow-x: auto; border-radius: 6px; line-height: 1.45; }
.post-content pre code { background: none; padding: 0; font-size: 0.8rem; }
.post-content table { border-collapse: collapse; margin: 0 0 1.25rem; width: 100%; font-size: 0.95rem; }
.post-content th, .post-content td { border-bottom: 1px solid var(--rule); padding: 0.4rem 0.6rem; text-align: left; vertical-align: top; }
.post-content .footnote { font-size: 0.9rem; color: #444; }
.post-content sup a { font-family: var(--sans); font-size: 0.75em; }

/* footer */
.site-footer { margin-top: 4rem; padding-top: 1.25rem; border-top: 1px solid var(--rule); font-family: var(--sans); font-size: 0.8rem; color: var(--muted); }

@media (max-width: 480px) {
  html { font-size: 17px; }
  body { padding: 1.75rem 1rem 3rem; }
  .post-header h1 { font-size: 1.65rem; }
}

@media print {
  .site-nav, .site-footer { display: none; }
  body { max-width: none; }
}