:root {
  --bg: #f4f6f8;
  --paper: #ffffff;
  --ink: #17202a;
  --muted: #5c6b7a;
  --line: #d5dde5;
  --header: #12181f;
  --header-ink: #f4f7fa;
  --link: #0b5f86;
  --link-hover: #084661;
  --accent: #1f8a5b;
  --code: #121920;
  --code-ink: #d7e2ec;
  --warn: #f4f0e6;
  --warn-line: #e2d3ad;
  --shadow: 0 1px 2px rgba(18, 24, 31, 0.06);
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.55 "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 0.15em; }
a:hover { color: var(--link-hover); }

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: #fff;
  padding: 0.4rem 0.7rem;
}
.skip:focus { top: 0.5rem; z-index: 5; }

.wrap { width: min(1080px, calc(100% - 2rem)); margin: 0 auto; }

.site-header {
  background: var(--header);
  color: var(--header-ink);
  border-bottom: 3px solid var(--accent);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.6rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--header-ink);
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
}
.brand-mark {
  width: 0.95rem;
  height: 0.95rem;
  background: var(--accent);
  box-shadow: 0.28rem 0 0 #163024, -0.28rem 0 0 #163024, 0 0.28rem 0 #163024, 0 -0.28rem 0 #163024;
}
.nav { display: flex; gap: 1.1rem; }
.nav a { color: #d5dee7; text-decoration: none; font-size: 0.95rem; }
.nav a[aria-current="page"], .nav a:hover { color: #fff; }

main { padding: 2rem 0 3rem; }

.hero, .page-head { margin-bottom: 20px; }
.eyebrow {
  margin: 0 0 0.4rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
h1 { font-size: clamp(1.8rem, 3vw, 2.4rem); line-height: 1.15; margin: 0 0 0.7rem; letter-spacing: -0.02em; }
h2 { font-size: 1.25rem; margin: 0 0 0.6rem; letter-spacing: -0.01em; }
.lede { margin: 0; color: var(--muted); font-size: 1.05rem; }

.filters {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr) auto;
  gap: 0.7rem;
  align-items: end;
  margin: 1.6rem 0 0.6rem;
  padding: 0.9rem;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.filters label { display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.78rem; color: var(--muted); }
.filters input, .filters select, .filters button, .button {
  font: inherit;
  color: var(--ink);
  background: #fff;
  border: 1px solid #b7c3ce;
  border-radius: 2px;
  padding: 0.45rem 0.55rem;
}
.filters button, .button {
  background: var(--header);
  color: #fff;
  border-color: var(--header);
  text-decoration: none;
  cursor: pointer;
}
.filters button:hover, .button:hover { background: #243140; color: #fff; }
.page-actions { margin: 1rem 0 0; }

.result-meta { color: var(--muted); font-size: 0.9rem; }

.cards, .article-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.8rem; }
.cards { grid-template-columns: repeat(2, 1fr); }
.card, .article-list article, .source-box {
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 1rem 1.05rem 0.9rem;
}
.card { padding: 0; overflow: hidden; }
.card-body { padding: 0.9rem 1.05rem 1rem; }
.card-photo { display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: cover; background: #e7edf2; }
.card h2, .article-list h2 { font-size: 1.15rem; }
.card h2 a, .article-list h2 a { text-decoration: none; }
.card h2 a:hover, .article-list h2 a:hover { text-decoration: underline; }
.card p, .article-list p { margin: 0.35rem 0 0; }
.model { color: var(--muted); font-size: 0.92rem; }
.card-top { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 0.55rem; }
.tag {
  display: inline-block;
  border: 1px solid var(--line);
  background: #f7f9fb;
  color: #314253;
  font-size: 0.75rem;
  line-height: 1.2;
  padding: 0.18rem 0.4rem;
}
.tag-mcu { border-color: #b7d7c6; background: #f1f8f4; color: #17613d; }
.card-links { display: flex; gap: 1rem; margin-top: 0.8rem !important; font-size: 0.92rem; }
.empty { background: var(--paper); border: 1px dashed var(--line); padding: 1rem; }

.crumbs { display: flex; flex-wrap: wrap; gap: 0.4rem; color: var(--muted); font-size: 0.88rem; margin-bottom: 1rem; }
.crumbs a { color: var(--muted); }

.prose { max-width: 46rem; }
.prose section + section { margin-top: 1.6rem; }
.prose p { margin: 0.7rem 0; }
.prose ul, .source-list, .source-box ul { margin: 0.4rem 0 0.8rem; padding-left: 1.15rem; }
.prose li + li, .source-box li + li { margin-top: 0.35rem; }
.prose code, .source-box code {
  font-family: ui-monospace, "Cascadia Code", "Source Code Pro", monospace;
  font-size: 0.88em;
  background: #e8eef3;
  padding: 0.05rem 0.28rem;
}
.prose pre {
  max-width: 100%;
  overflow: auto;
  background: var(--code);
  color: var(--code-ink);
  padding: 0.9rem 1rem;
  border-radius: 2px;
  line-height: 1.45;
}
.prose pre code { background: transparent; color: inherit; padding: 0; font-size: 0.82rem; }
.prose blockquote {
  margin: 0.8rem 0;
  padding: 0.7rem 0.9rem;
  background: var(--warn);
  border-left: 3px solid var(--warn-line);
}
.prose blockquote p { margin: 0; }

.guide-layout { display: grid; grid-template-columns: 14rem minmax(0, 1fr); gap: 1.5rem; align-items: start; }
.toc {
  position: sticky;
  top: 1rem;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 0.8rem 0.9rem;
}
.toc ol { margin: 0; padding-left: 1.15rem; }
.toc a { text-decoration: none; font-size: 0.92rem; }
.toc li + li { margin-top: 0.3rem; }

.source-box { margin-top: 1.5rem; max-width: 46rem; }
.source-box h2 { font-size: 1rem; }
.source-list { list-style: none; padding-left: 0; }
.source-list li, .source-box li { display: flex; flex-wrap: wrap; gap: 0.35rem 0.5rem; align-items: baseline; }
.source-url { flex-basis: 100%; color: var(--muted); font-family: ui-monospace, "Cascadia Code", monospace; font-size: 0.78rem; word-break: break-all; }
.shots { display: grid; gap: 0.8rem; margin: 0.9rem 0 0.2rem; }
.shot { margin: 0; background: var(--paper); border: 1px solid var(--line); }
.shot img { display: block; width: 100%; height: auto; background: #e7edf2; }
.shot figcaption { padding: 0.55rem 0.75rem 0.75rem; color: var(--muted); font-size: 0.9rem; }
.shot figcaption a { display: inline-block; margin-top: 0.2rem; }

.site-footer { border-top: 1px solid var(--line); background: #e9eef2; color: var(--muted); font-size: 0.88rem; }
.footer-inner { padding: 1.2rem 0 1.6rem; }
.footer-inner p { margin: 0.4rem 0; }
.footer-links { display: flex; gap: 1rem; flex-wrap: wrap; }

@media (max-width: 860px) {
  .filters, .cards, .guide-layout { grid-template-columns: minmax(0, 1fr); }
  .toc { position: static; }
  .header-inner { align-items: flex-start; flex-direction: column; padding: 0.7rem 0; }
}