:root {
  --bg: #f6f3ee;
  --bg-elevated: #fffcf7;
  --ink: #1a1f1c;
  --ink-muted: #5c665f;
  --line: #d9d2c5;
  --accent: #0f6b5c;
  --accent-soft: #d8efe9;
  --warn: #8a4b12;
  --warn-soft: #f3e4d4;
  --sidebar: #14201c;
  --sidebar-ink: #e8efe9;
  --sidebar-muted: #9db0a6;
  --code-bg: #eef2ef;
  --radius: 10px;
  --max: 46rem;
  --sidebar-w: 17.5rem;
  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --font-body: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--font-body);
  font-size: 1.02rem;
  line-height: 1.65;
}

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

a:hover {
  color: #0a4f44;
}

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  background: var(--sidebar);
  color: var(--sidebar-ink);
  padding: 1.4rem 1rem 2rem;
}

.sidebar a {
  color: var(--sidebar-ink);
  text-decoration: none;
}

.sidebar a:hover,
.sidebar a[aria-current="page"] {
  color: #fff;
}

.brand {
  display: block;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  margin: 0 0 0.25rem;
  padding: 0 0.55rem;
}

.brand-sub {
  margin: 0 0 1.25rem;
  padding: 0 0.55rem;
  color: var(--sidebar-muted);
  font-size: 0.78rem;
  line-height: 1.4;
}

.nav-label {
  margin: 1.1rem 0 0.35rem;
  padding: 0 0.55rem;
  color: var(--sidebar-muted);
  font-size: 0.68rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.nav-list a {
  display: block;
  padding: 0.38rem 0.55rem;
  border-radius: 7px;
  font-size: 0.86rem;
  line-height: 1.35;
  color: #c5d4cc;
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.nav-list .num {
  display: inline-block;
  min-width: 1.5rem;
  color: var(--sidebar-muted);
  font-variant-numeric: tabular-nums;
}

.content {
  padding: 2.25rem 2rem 4rem;
}

.article {
  max-width: var(--max);
  margin: 0 auto;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 2rem 2.1rem 2.4rem;
  box-shadow: 0 1px 0 rgba(26, 31, 28, 0.04);
}

.kicker {
  margin: 0 0 0.5rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 3vw, 2.35rem);
  line-height: 1.15;
  font-weight: 600;
}

h2 {
  margin: 2rem 0 0.7rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  line-height: 1.25;
}

h3 {
  margin: 1.4rem 0 0.45rem;
  font-size: 1.02rem;
}

.lead {
  margin: 0 0 1.4rem;
  color: var(--ink-muted);
  font-size: 1.08rem;
}

p {
  margin: 0 0 1rem;
}

ul,
ol {
  margin: 0 0 1.1rem;
  padding-left: 1.25rem;
}

li {
  margin: 0.3rem 0;
}

li::marker {
  color: var(--ink-muted);
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.4rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-muted);
  font-size: 0.78rem;
  font-weight: 600;
}

.chip.accent {
  background: var(--accent-soft);
  border-color: #b7ddd3;
  color: var(--accent);
}

.chip.warn {
  background: var(--warn-soft);
  border-color: #e4c9a8;
  color: var(--warn);
}

.card-grid {
  display: grid;
  gap: 0.85rem;
  margin: 1.2rem 0 1.5rem;
}

.card-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 1rem 1.05rem;
}

.card h3 {
  margin-top: 0;
}

.card p:last-child,
.card ul:last-child {
  margin-bottom: 0;
}

.card a.stretch {
  display: block;
  color: inherit;
  text-decoration: none;
}

.card a.stretch:hover h3 {
  color: var(--accent);
}

.callout {
  margin: 1.2rem 0;
  padding: 0.95rem 1.05rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #fff;
}

.callout.learn {
  border-left: 4px solid var(--accent);
}

.callout.build {
  border-left: 4px solid #2f5d9f;
}

.callout.check {
  border-left: 4px solid #6b7c3c;
  background: #f4f6ee;
}

.callout.notes {
  border-left: 4px solid var(--warn);
  background: var(--warn-soft);
}

.callout strong.label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

pre,
.code {
  margin: 0 0 1rem;
  padding: 0.9rem 1rem;
  overflow: auto;
  border-radius: 8px;
  background: var(--code-bg);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.5;
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

pre code {
  background: none;
  padding: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.2rem;
  font-size: 0.92rem;
}

th,
td {
  text-align: left;
  vertical-align: top;
  padding: 0.65rem 0.7rem;
  border-bottom: 1px solid var(--line);
}

th {
  color: var(--ink-muted);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 700;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}

.pager a {
  display: inline-block;
  max-width: 48%;
  padding: 0.7rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.9rem;
}

.pager a:hover {
  border-color: #b7ddd3;
  background: var(--accent-soft);
}

.pager .dir {
  display: block;
  color: var(--ink-muted);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}

.pager .next {
  margin-left: auto;
  text-align: right;
}

.home-hero {
  max-width: 54rem;
  margin: 0 auto;
}

.home-hero .article {
  max-width: none;
}

.arch {
  margin: 1rem 0 1.4rem;
  padding: 1rem;
  border-radius: var(--radius);
  background: #12201b;
  color: #d7e6df;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.45;
  overflow: auto;
  white-space: pre;
}

.questions {
  list-style: none;
  padding: 0;
}

.questions li {
  margin: 0.55rem 0;
  padding: 0.75rem 0.85rem;
  border-radius: 8px;
  background: #fff;
  border: 1px solid var(--line);
}

.questions li::before {
  content: "Q";
  display: inline-block;
  width: 1.35rem;
  height: 1.35rem;
  margin-right: 0.45rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  text-align: center;
  line-height: 1.35rem;
}

@media (max-width: 920px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: relative;
    height: auto;
    max-height: none;
  }

  .card-grid.two {
    grid-template-columns: 1fr;
  }

  .content {
    padding: 1.25rem 1rem 3rem;
  }

  .article {
    padding: 1.35rem 1.15rem 1.75rem;
  }
}

@media print {
  .sidebar,
  .pager {
    display: none;
  }

  .layout {
    display: block;
  }

  .article {
    border: none;
    box-shadow: none;
    padding: 0;
  }
}