/* hdlfactory theme — design tokens + layout + prose.
 * One file, no framework. Light is the default; dark redefines the
 * tokens under [data-theme="dark"]. */

:root {
  /* surfaces */
  --bg: #ffffff;
  --bg-raised: #f6f8fa;
  --border: #d9dee3;
  /* text */
  --fg: #1c2128;
  --fg-muted: #59636e;
  /* accent (the site's blue, kept) */
  --accent: #0b63ce;
  --accent-soft: #e3efff;
  /* code */
  --code-bg: #f6f8fa;
  /* type scale (minor third-ish) */
  --step-0: 1.0rem;
  --step-1: 1.2rem;
  --step-2: 1.44rem;
  --step-3: 1.73rem;
  --step-4: 2.07rem;
  /* layout */
  --measure: 70ch;
  --measure-wide: 90ch;
  --gap: 1.25rem;
  --mono: "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas,
          monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans",
          sans-serif;
}

[data-theme="dark"] {
  --bg: #14181d;
  --bg-raised: #1c2128;
  --border: #343b44;
  --fg: #d7dde3;
  --fg-muted: #8d97a2;
  --accent: #58a6ff;
  --accent-soft: #12263f;
  --code-bg: #1c2128;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
}

.container {
  max-width: var(--measure-wide);
  margin: 0 auto;
  padding: 0 1rem;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1rem;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; z-index: 10; }

/* ---- header / nav ---- */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg-raised);
}
.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  padding-top: 0.6rem;
  padding-bottom: 0.6rem;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 650;
  font-size: var(--step-1);
  color: var(--fg);
}
.brand:hover { text-decoration: none; color: var(--accent); }
.brand img { border-radius: 4px; }
.menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
.menu a {
  display: inline-block;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  color: var(--fg-muted);
  font-weight: 500;
}
.menu a:hover {
  color: var(--accent);
  background: var(--accent-soft);
  text-decoration: none;
}
#theme-toggle {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  border-radius: 6px;
  padding: 0.25rem 0.55rem;
  font-size: var(--step-0);
  cursor: pointer;
  line-height: 1.4;
}
#theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* ---- entry list (home, sections, per-tag) ---- */

main.container { padding-top: 1.75rem; padding-bottom: 3rem; }

.page-title { font-size: var(--step-3); margin: 0 0 1rem; }

.search { margin: 1.5rem 0; }
.search input {
  width: 100%;
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.9rem;
}
.search input:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.entries { list-style: none; margin: 0; padding: 0; }
.entry {
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
}
.entry-line {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.entry-line time {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--fg-muted);
  white-space: nowrap;
}
.entry-title { font-weight: 600; font-size: var(--step-1); }
.entry-summary {
  margin: 0.3rem 0 0;
  color: var(--fg-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tag {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 4px;
  padding: 0.05rem 0.4rem;
  margin-right: 0.25rem;
  white-space: nowrap;
}
.tag:hover { text-decoration: none; filter: brightness(0.92); }

.term-cloud {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.term-cloud .count { color: var(--fg-muted); font-size: 0.82rem; }

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

.article-header h1 {
  font-size: var(--step-4);
  line-height: 1.2;
  margin: 0 0 0.5rem;
  max-width: var(--measure-wide);
}
.article-header .meta {
  color: var(--fg-muted);
  font-size: 0.92rem;
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  flex-wrap: wrap;
}
.article-header .meta time { font-family: var(--mono); }
.article-header { border-bottom: 1px solid var(--border);
  margin-bottom: 1.75rem; padding-bottom: 1rem; }

/* Prose measures: text at --measure, big blocks may take the wide slot. */
.prose { max-width: var(--measure); }
.prose.lead { color: var(--fg-muted); }
.prose h1 { font-size: var(--step-3); }
.prose h2 { font-size: var(--step-2); margin-top: 2.2rem; }
.prose h3 { font-size: var(--step-1); margin-top: 1.8rem; }
.prose h2, .prose h3 { line-height: 1.3; }
.prose hr { border: 0; border-top: 1px solid var(--border); }
.prose img, .prose video, .prose iframe {
  max-width: min(var(--measure-wide), 100%);
  height: auto;
  display: block;
  margin: 1.5rem auto;
  border-radius: 6px;
}
.prose blockquote:empty { display: none; }
.prose blockquote {
  margin: 1.25rem 0;
  padding: 0.2rem 1.1rem;
  border-left: 3px solid var(--accent);
  background: var(--bg-raised);
  color: var(--fg-muted);
  border-radius: 0 6px 6px 0;
}

/* code */
code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}
pre {
  max-width: var(--measure-wide);
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  line-height: 1.5;
}
pre code { background: none; border: 0; padding: 0; font-size: 0.86rem; }
.highlight pre { margin: 0; }
.highlight { margin: 1.25rem 0; max-width: var(--measure-wide); }

/* tables */
.prose table {
  border-collapse: collapse;
  max-width: var(--measure-wide);
  margin: 1.25rem 0;
  display: block;
  overflow-x: auto;
}
.prose th, .prose td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.7rem;
  text-align: left;
}
.prose thead th { background: var(--bg-raised); }
.prose tr:nth-child(even) td { background: var(--bg-raised); }

/* ---- footer ---- */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-raised);
  color: var(--fg-muted);
  text-align: center;
  padding: 1.5rem 0 1rem;
  font-size: 0.92rem;
}
.site-footer a { color: var(--accent); }
.fineprint { font-size: 0.8rem; margin-top: 0.6rem; }

/* ---- small screens ---- */

@media (max-width: 640px) {
  body { font-size: 16px; }
  .entry-line { gap: 0.4rem; }
  .nav-row { justify-content: center; }
}