/* ====================================================================
   The TK Home Infrastructure Handbook — homelab.aidalee.com
   Design system: warm-paper light, warm-charcoal dark, serif headings.
   ==================================================================== */

:root {
  --bg: #faf8f5;
  --bg-card: #ffffff;
  --bg-sidebar: #f3efe7;
  --bg-code: #f3f0e9;
  --bg-callout: #ede9f5;
  --ink: #1f2024;
  --ink-soft: #5a5a60;
  --ink-faint: #8a8a90;
  --accent: #6b5b95;
  --accent-deep: #4a3f6b;
  --blue: #4a78b5;
  --blue-soft: #e6eef8;
  --green: #5d8a4a;
  --green-soft: #e9f1e2;
  --orange: #c4741f;
  --orange-soft: #fbeed4;
  --red: #b54a4a;
  --red-soft: #f7e2e2;
  --border: #e8e4dc;
  --shadow: 0 1px 4px rgba(40, 30, 20, 0.06);
  --shadow-lg: 0 8px 24px rgba(40, 30, 20, 0.10);
  --radius: 8px;
  --radius-lg: 12px;
  --serif: 'Georgia', 'Iowan Old Style', 'Charter', serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --mono: 'SF Mono', 'JetBrains Mono', 'Menlo', 'Consolas', monospace;
  --max-w: 1200px;
  --content-w: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a1d;
    --bg-card: #25252a;
    --bg-sidebar: #202024;
    --bg-code: #2a2a2e;
    --bg-callout: #2e2740;
    --ink: #ececec;
    --ink-soft: #b0b0b5;
    --ink-faint: #7a7a80;
    --accent: #b09cd9;
    --accent-deep: #d4c4f0;
    --blue: #8ab4e8;
    --blue-soft: #1f2d3e;
    --green: #9cc587;
    --green-soft: #1f2e1c;
    --orange: #e3a763;
    --orange-soft: #3a2c1a;
    --red: #e08080;
    --red-soft: #3a1f1f;
    --border: #353539;
    --shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.25;
  color: var(--ink);
}
h1 { font-size: 2.4rem; margin: 0 0 0.5rem; }
h2 {
  font-size: 1.6rem; margin: 2.4rem 0 0.8rem;
  padding-bottom: 0.4rem; border-bottom: 1px solid var(--border);
}
h3 { font-size: 1.2rem; margin: 1.8rem 0 0.6rem; }
h4 { font-size: 1.05rem; margin: 1.4rem 0 0.5rem; }
p { margin: 0.8rem 0; }
a {
  color: var(--accent); text-decoration: none;
  border-bottom: 1px dotted var(--accent);
}
a:hover { border-bottom-style: solid; }
hr {
  border: 0; border-top: 1px solid var(--border);
  margin: 2rem 0;
}
code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg-code);
  padding: 0.12em 0.4em;
  border-radius: 3px;
  border: 1px solid var(--border);
}
pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.5;
  margin: 1rem 0;
}
pre code {
  background: none; border: 0; padding: 0;
  font-size: inherit;
}
blockquote {
  border-left: 3px solid var(--accent);
  background: var(--bg-callout);
  margin: 1rem 0;
  padding: 0.6rem 1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--ink);
}
blockquote p:first-child { margin-top: 0; }
blockquote p:last-child { margin-bottom: 0; }
ul, ol { padding-left: 1.5rem; }
li { margin: 0.3rem 0; }
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}
th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.7rem;
  text-align: left;
}
th { background: var(--bg-card); font-weight: 600; }
img { max-width: 100%; height: auto; border-radius: var(--radius); }

/* ---------- Layout: docs with sidebar ---------- */
.docs-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100vh;
}
.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 1.5rem 1rem 4rem;
  position: sticky; top: 0; align-self: start;
  max-height: 100vh; overflow-y: auto;
  font-size: 0.92rem;
}
.sidebar .brand {
  display: block;
  font-family: var(--serif); font-size: 1.15rem;
  font-weight: 600; color: var(--ink);
  border-bottom: 0;
  margin-bottom: 0.4rem;
  padding: 0 0.2rem;
}
.sidebar .brand .icon { color: var(--accent); margin-right: 0.3rem; }
.sidebar .subtitle { font-size: 0.78rem; color: var(--ink-faint); margin: 0 0.2rem 1.2rem; }
.sidebar h6 {
  font-family: var(--sans);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  margin: 1.2rem 0.2rem 0.4rem;
  font-weight: 700;
}
.sidebar ul { list-style: none; padding-left: 0; margin: 0; }
.sidebar li { margin: 0.1rem 0; }
.sidebar a {
  display: block;
  padding: 0.3rem 0.5rem;
  border-radius: 4px;
  color: var(--ink-soft);
  border-bottom: 0;
  font-size: 0.9rem;
  line-height: 1.35;
}
.sidebar a:hover { background: var(--bg-card); color: var(--ink); }
.sidebar a.active {
  background: var(--accent);
  color: white;
  font-weight: 600;
}
.sidebar a.active:hover { background: var(--accent-deep); }
.sidebar .search-box {
  margin: 0 0.2rem 0.6rem;
  width: calc(100% - 0.4rem);
}
.sidebar .search-box input {
  width: 100%;
  padding: 0.4rem 0.6rem;
  font-size: 0.88rem;
  font-family: var(--sans);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--ink);
}
.sidebar .search-box input:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

.content { padding: 2.5rem 3rem 5rem; max-width: 880px; }
.content .crumbs {
  font-size: 0.85rem; color: var(--ink-faint);
  margin-bottom: 1rem;
}
.content .crumbs a {
  color: var(--ink-faint); border-bottom: 1px dotted var(--ink-faint);
}
.content .crumbs a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ---------- Callouts ---------- */
.callout {
  border-left: 3px solid var(--accent);
  background: var(--bg-callout);
  padding: 0.8rem 1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.2rem 0;
}
.callout.tip { border-left-color: var(--green); background: var(--green-soft); }
.callout.warn { border-left-color: var(--red); background: var(--red-soft); }
.callout.note { border-left-color: var(--blue); background: var(--blue-soft); }
.callout.idea { border-left-color: var(--orange); background: var(--orange-soft); }
.callout .label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.3rem;
  color: var(--ink-soft);
}
.callout p:last-child { margin-bottom: 0; }

/* ---------- Topic cards grid ---------- */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.topic-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.3rem;
  box-shadow: var(--shadow);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  display: block;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
}
.topic-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.topic-card h3 { margin: 0 0 0.4rem; color: var(--accent); font-size: 1.1rem; }
.topic-card p { margin: 0; font-size: 0.92rem; color: var(--ink-soft); }
.topic-card .count {
  display: inline-block; margin-top: 0.6rem;
  font-size: 0.75rem; color: var(--ink-faint);
  text-transform: uppercase; letter-spacing: 0.06em; font-weight: 600;
}
.topic-card.empty { opacity: 0.5; }
.topic-card.empty:hover { transform: none; box-shadow: var(--shadow); }
.topic-card.wip { border-left: 3px solid var(--orange); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-family: var(--sans);
  cursor: pointer;
  text-decoration: none;
  border-bottom: 1px solid var(--border);
}
.btn:hover { background: var(--bg-code); border-bottom-color: var(--border); }
.btn.primary { background: var(--accent); color: white; border-color: var(--accent); }
.btn.primary:hover { background: var(--accent-deep); border-color: var(--accent-deep); color: white; }
.btn .icon { margin-right: 0.4rem; }

.toolbar {
  display: flex; gap: 0.5rem; flex-wrap: wrap;
  margin: 0 0 1.5rem;
  align-items: center;
}
.toolbar .grow { flex: 1; }
.toolbar .badge {
  display: inline-block;
  font-size: 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
  color: var(--ink-soft);
}

/* ---------- Footer / next nav ---------- */
.next-nav {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 3rem; padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
  gap: 1rem;
  flex-wrap: wrap;
}
.next-nav a {
  color: var(--accent); border-bottom: 0;
  padding: 0.5rem 0.9rem; border-radius: var(--radius);
  background: var(--bg-card); border: 1px solid var(--border);
}
.next-nav a:hover { background: var(--bg-callout); border-color: var(--accent); }
.next-nav .next-label { font-size: 0.75rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.06em; display: block; }
.meta { text-align: center; margin-top: 2.5rem; color: var(--ink-faint); font-size: 0.8rem; }

/* ---------- Hero / landing ---------- */
.hero {
  text-align: center;
  padding: 4rem 1.5rem 3rem;
  max-width: 820px;
  margin: 0 auto;
}
.hero .eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 1rem;
}
.hero h1 {
  font-size: 3rem; line-height: 1.1;
  margin: 0 0 0.8rem;
}
.hero .tagline {
  font-size: 1.15rem; color: var(--ink-soft);
  max-width: 640px; margin: 0 auto 2rem;
}
.hero .principles {
  display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center;
  margin: 1.5rem 0;
}
.hero .principles span {
  font-size: 0.8rem; background: var(--bg-card);
  border: 1px solid var(--border); padding: 0.3rem 0.7rem;
  border-radius: 14px; color: var(--ink-soft);
}

/* ---------- Design principles block ---------- */
.principles-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.8rem; margin: 1.5rem 0;
}
.principle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
  font-size: 0.92rem;
}
.principle .num {
  font-family: var(--serif); font-weight: 700;
  color: var(--accent); font-size: 0.9rem;
  text-transform: uppercase; letter-spacing: 0.06em;
  display: block; margin-bottom: 0.3rem;
}

/* ---------- Diagram blocks ---------- */
.diagram {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.2rem 0;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.5;
  white-space: pre;
  overflow-x: auto;
}

/* ---------- Mobile ---------- */
@media (max-width: 900px) {
  .docs-layout { grid-template-columns: 1fr; }
  .sidebar {
    position: static; max-height: none; border-right: 0;
    border-bottom: 1px solid var(--border);
    padding: 1rem;
  }
  .content { padding: 1.5rem 1rem 3rem; }
  .hero h1 { font-size: 2.2rem; }
  .hero { padding: 2rem 1rem; }
}

/* ---------- Print ---------- */
@media print {
  :root {
    --bg: white; --bg-card: white; --bg-sidebar: white;
    --bg-code: #f3f0e9; --ink: black; --ink-soft: #444;
    --border: #ccc; --shadow: none; --shadow-lg: none;
  }
  .sidebar, .toolbar, .next-nav, .no-print { display: none !important; }
  .docs-layout { grid-template-columns: 1fr; }
  .content { max-width: 100%; padding: 0; }
  body { font-size: 11pt; }
  h1 { font-size: 24pt; page-break-after: avoid; }
  h2, h3, h4 { page-break-after: avoid; }
  pre, blockquote, .callout, .diagram, table { page-break-inside: avoid; }
  a { color: var(--ink); border-bottom: 0; }
  a[href^="http"]::after {
    content: " (" attr(href) ")"; font-size: 0.8em; color: #666;
  }
  a[href^="/"]::after, a[href^="#"]::after { content: ""; }
  .topic-card { box-shadow: none; }
}