/* rCell Notes — personal documentation site
   Self-contained, no external resources. System font stacks only. */

:root {
  --ink:        #1f2933;
  --ink-soft:   #3e4c59;
  --muted:      #7b8794;
  --line:       #dfe4ea;
  --line-soft:  #eaeef2;
  --bg:         #ffffff;
  --bg-alt:     #f5f7f9;
  --bg-code:    #f3f5f7;
  --accent:     #2f6f77;
  --accent-dk:  #235359;
  --accent-bg:  #e7f0f0;
  --ok:         #3c7d57;
  --warn:       #b3822c;
  --err:        #b3524c;
  --maxw:       1160px;
  --radius:     8px;
  --mono: "DejaVu Sans Mono", "SFMono-Regular", "Consolas", "Liberation Mono", Menlo, monospace;
  --sans: "DejaVu Sans", -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.62;
  color: var(--ink);
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

/* ---------- header / top nav ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 20;
}
.site-header .bar {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 64px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; text-decoration: none; }
.brand img { height: 40px; width: auto; display: block; }
.nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
  flex-wrap: wrap;
}
.nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 14.5px;
  padding: 7px 12px;
  border-radius: 6px;
  white-space: nowrap;
}
.nav a:hover { background: var(--bg-alt); color: var(--ink); }
.nav a.active { color: var(--accent-dk); background: var(--accent-bg); font-weight: 600; }

/* ---------- layout ---------- */
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
.layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 24px 64px;
  align-items: start;
}

/* ---------- sidebar (on-page TOC) ---------- */
.sidebar {
  position: sticky;
  top: 88px;
  font-size: 14px;
}
.sidebar h4 {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.sidebar ul { list-style: none; margin: 0 0 22px; padding: 0; border-left: 2px solid var(--line); }
.sidebar li { margin: 0; }
.sidebar a {
  display: block;
  padding: 4px 12px;
  color: var(--ink-soft);
  text-decoration: none;
  border-left: 2px solid transparent;
  margin-left: -2px;
}
.sidebar a:hover { color: var(--accent-dk); border-left-color: var(--accent); }
.sidebar .note { color: var(--muted); font-size: 12.5px; line-height: 1.5; }

/* ---------- content ---------- */
.content { min-width: 0; max-width: 820px; }
.content h1 {
  font-size: 30px;
  line-height: 1.2;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}
.content h2 {
  font-size: 21px;
  margin: 40px 0 10px;
  padding-top: 8px;
  border-top: 1px solid var(--line-soft);
  letter-spacing: -0.01em;
}
.content h2:first-of-type { border-top: none; }
.content h3 { font-size: 17px; margin: 26px 0 6px; color: var(--ink-soft); }
.content p { margin: 0 0 14px; }
.content a { color: var(--accent-dk); }
.content ul, .content ol { padding-left: 22px; margin: 0 0 16px; }
.content li { margin: 4px 0; }
.lede { font-size: 18px; color: var(--ink-soft); margin-bottom: 24px; }

.breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 4px; font-family: var(--mono); }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent-dk); }

.updated { font-size: 13px; color: var(--muted); margin: 2px 0 22px; }

/* ---------- hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 28px;
  align-items: center;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 30px;
  margin: 6px 0 30px;
}
.hero img { width: 100%; height: auto; border-radius: 6px; }
.hero h1 { margin-top: 0; }
.badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent-dk);
  background: var(--accent-bg);
  border: 1px solid #cfe0e0;
  padding: 2px 9px;
  border-radius: 20px;
  margin-bottom: 12px;
}

/* ---------- figures ---------- */
figure {
  margin: 22px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-alt);
}
figure img { display: block; width: 100%; height: auto; }
figcaption {
  font-size: 13px;
  color: var(--muted);
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: var(--bg);
}

/* ---------- tables ---------- */
.table-scroll { overflow-x: auto; margin: 18px 0; }
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14.5px;
}
th, td {
  text-align: left;
  padding: 9px 13px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
thead th {
  background: var(--bg-alt);
  color: var(--ink-soft);
  font-size: 13px;
  letter-spacing: 0.02em;
  border-bottom: 2px solid var(--line);
}
tbody tr:hover { background: var(--bg-alt); }
td code { white-space: nowrap; }

/* ---------- code ---------- */
code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg-code);
  padding: 1.5px 5px;
  border-radius: 4px;
  color: #33474b;
}
pre {
  background: #1f2933;
  color: #e2e8ee;
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
  margin: 16px 0;
  font-size: 13.5px;
  line-height: 1.55;
  border: 1px solid #17202a;
}
pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: 13.5px;
}
pre .c { color: #8fa3ad; }   /* comment */
pre .p { color: #7fd1c4; }   /* prompt / accent */

/* ---------- callouts ---------- */
.callout {
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  background: var(--bg-alt);
  border-radius: 6px;
  padding: 12px 16px;
  margin: 18px 0;
  font-size: 15px;
}
.callout.warn { border-left-color: var(--warn); }
.callout.tip  { border-left-color: var(--ok); }
.callout p:last-child { margin-bottom: 0; }
.callout strong { color: var(--ink); }

/* ---------- spec / cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 22px 0;
}
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  background: var(--bg);
}
.card h3 { margin: 0 0 4px; font-size: 15.5px; }
.card p { margin: 0; font-size: 14px; color: var(--ink-soft); }
.card a { text-decoration: none; }
.card a:hover h3 { color: var(--accent-dk); }

/* recent notes list */
.notes-list { list-style: none; padding: 0; margin: 8px 0 0; }
.notes-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  display: flex;
  gap: 14px;
  align-items: baseline;
}
.notes-list time { font-family: var(--mono); font-size: 12.5px; color: var(--muted); min-width: 92px; }
.notes-list a { text-decoration: none; color: var(--accent-dk); font-weight: 600; }
.notes-list a:hover { text-decoration: underline; }
.notes-list span { color: var(--ink-soft); font-size: 14px; }

/* LED swatches */
.dot { display: inline-block; width: 11px; height: 11px; border-radius: 50%; vertical-align: middle; margin-right: 6px; border: 1px solid rgba(0,0,0,.15); }
.dot.green { background: #4a9e6b; }
.dot.amber { background: #d9a441; }
.dot.red   { background: #c15c5c; }
.dot.blue  { background: #3a6ea5; }
.dot.off   { background: #cbd2d9; }

/* download rows */
.dl {
  display: flex;
  align-items: center;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px 16px;
  margin: 10px 0;
  text-decoration: none;
  color: var(--ink);
  background: var(--bg);
}
.dl:hover { border-color: var(--accent); background: var(--bg-alt); }
.dl .ic { font-family: var(--mono); font-size: 12px; color: #fff; background: var(--accent); padding: 4px 8px; border-radius: 4px; }
.dl .meta { margin-left: auto; font-family: var(--mono); font-size: 12.5px; color: var(--muted); }
.dl b { font-weight: 600; }
.dl small { display: block; color: var(--muted); font-size: 12.5px; font-weight: 400; }

/* search (non-functional, decorative) */
.searchbox {
  display: flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 4px 6px 4px 12px;
  background: var(--bg-alt);
  max-width: 220px;
}
.searchbox input {
  border: none;
  background: none;
  outline: none;
  font: inherit;
  font-size: 14px;
  width: 100%;
  color: var(--ink);
}
.searchbox .k { font-family: var(--mono); font-size: 11px; color: var(--muted); border: 1px solid var(--line); border-radius: 4px; padding: 1px 5px; }

.tag { font-family: var(--mono); font-size: 11.5px; color: var(--accent-dk); background: var(--accent-bg); padding: 1px 7px; border-radius: 4px; }

/* pager */
.pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  border-top: 1px solid var(--line);
  padding-top: 20px;
}
.pager a {
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 16px;
  color: var(--ink-soft);
  font-size: 14px;
  max-width: 48%;
}
.pager a:hover { border-color: var(--accent); color: var(--accent-dk); }
.pager small { display: block; color: var(--muted); font-size: 12px; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
  color: var(--muted);
  font-size: 13.5px;
}
.site-footer .bar {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 26px 24px;
  display: flex;
  gap: 18px 40px;
  flex-wrap: wrap;
  justify-content: space-between;
}
.site-footer a { color: var(--ink-soft); text-decoration: none; }
.site-footer a:hover { color: var(--accent-dk); }
.site-footer .links { display: flex; gap: 18px; flex-wrap: wrap; }

kbd {
  font-family: var(--mono);
  font-size: 12px;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 6px;
}

hr { border: none; border-top: 1px solid var(--line); margin: 32px 0; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; gap: 8px; }
  .sidebar { position: static; top: auto; display: none; }
  .hero { grid-template-columns: 1fr; }
  .content { max-width: none; }
}
@media (max-width: 560px) {
  .site-header .bar { min-height: 56px; padding: 8px 16px; }
  .nav { width: 100%; margin-left: 0; }
  .wrap, .layout { padding-left: 16px; padding-right: 16px; }
  .content h1 { font-size: 25px; }
  .searchbox { display: none; }
}