/* Shared styles for the LAMP viewshed blog. Plain CSS, no build step,
   no external font or framework dependency — kept deliberately
   self-contained so the site works from a static file server with
   nothing else in place. */

:root {
  --ink: #0f172a;
  --mute: #64748b;
  --line: #cbd5e1;
  --accent: #f97316;
  --accent-dark: #b45309;
  --accent-bg: #fff7ed;
  --cyan: #0891b2;
  --cyan-dark: #0e7490;
  --paper: #ffffff;
  --canvas: #f8fafc;
  --max-w: 720px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        Helvetica, Arial, sans-serif;
}

header.site-header {
  background: var(--ink);
  color: #fff;
  padding: 28px 24px;
}

header.site-header .wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

header.site-header a.brand {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.15rem;
}

header.site-header a.brand:hover { text-decoration: underline; }

header.site-header nav a {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 0.92rem;
  margin-left: 18px;
}

header.site-header nav a:hover { color: #fff; }

main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 36px 24px 64px;
}

/* ---- index / post-list page ------------------------------------- */

.intro {
  color: var(--mute);
  margin-bottom: 32px;
  font-size: 1.02rem;
}

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

.post-card {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.post-card:first-child { padding-top: 0; }

.post-card time {
  display: block;
  color: var(--mute);
  font-size: 0.85rem;
  margin-bottom: 4px;
}

.post-card h2 {
  margin: 0 0 8px;
  font-size: 1.4rem;
}

.post-card h2 a {
  color: var(--ink);
  text-decoration: none;
}

.post-card h2 a:hover { color: var(--accent-dark); }

.post-card p { margin: 0; color: #334155; }

/* ---- article page ------------------------------------------------ */

article.post > .kicker {
  color: var(--mute);
  font-size: 0.92rem;
  margin-bottom: 4px;
}

article.post h1 {
  margin: 4px 0 2px;
  font-size: 2.1rem;
  line-height: 1.2;
}

article.post .subtitle {
  color: var(--mute);
  font-size: 1.15rem;
  margin: 0 0 22px;
}

.byline-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 0 0 26px;
  flex-wrap: wrap;
}

.byline-author {
  display: flex;
  align-items: center;
  gap: 10px;
}

.byline-author .avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  border: 1px solid #000;
}

.byline-author span {
  font-weight: 600;
  color: var(--ink);
  font-size: 0.95rem;
  line-height: 1;
}

.byline-row .program-badge { height: 34px; width: auto; display: block; }

article.post figure {
  margin: 28px 0;
}

article.post figure img,
article.post figure svg {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
}

article.post figure.schematic svg { padding: 12px; }

article.post .schematic-row {
  display: flex;
  gap: 16px;
}

article.post .schematic-item {
  flex: 1 1 0;
  min-width: 0;
}

article.post .schematic-item svg { margin: 0; }

article.post .schematic-title {
  text-align: center;
  font-size: 0.85rem;
  color: var(--mute);
  margin: 8px 0 0;
}

@media (max-width: 560px) {
  article.post .schematic-row { flex-direction: column; }
}

article.post figcaption {
  font-size: 0.85rem;
  color: var(--mute);
  margin-top: 8px;
}

article.post h2 {
  margin: 40px 0 12px;
  font-size: 1.4rem;
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

article.post h2:first-of-type { border-top: none; padding-top: 0; }

article.post p { margin: 0 0 16px; }

article.post a { color: var(--cyan-dark); }

article.post table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 24px;
  font-size: 0.95rem;
}

article.post th, article.post td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
}

article.post th { color: var(--mute); font-weight: 600; }

article.post strong { color: var(--ink); }

article.post code {
  background: #eef2f7;
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.9em;
}

.callout {
  background: var(--accent-bg);
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 16px 20px;
  margin: 20px 0;
}

.callout p:last-child { margin-bottom: 0; }

footer.post-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--mute);
  font-size: 0.9rem;
}

footer.post-footer a { color: var(--cyan-dark); }

footer.site-footer {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px 48px;
  color: var(--mute);
  font-size: 0.85rem;
}

@media (max-width: 480px) {
  main { padding: 24px 16px 48px; }
  article.post h1 { font-size: 1.6rem; }
}