:root {
  --bg: #f7f3ea;
  --paper: #fffaf1;
  --ink: #22201d;
  --muted: #6f675d;
  --line: #ddd2c0;
  --accent: #a44934;
  --accent-2: #1d7a74;
  --code-bg: #26231f;
  --code-ink: #f4ecdd;
  --sidebar: #ede3d2;
  --focus: #1864ab;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #713020;
}

.skip-link {
  position: fixed;
  left: 12px;
  top: 12px;
  z-index: 20;
  transform: translateY(-160%);
  padding: 8px 12px;
  background: var(--paper);
  border: 1px solid var(--line);
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  padding: 24px 18px;
  background: var(--sidebar);
  border-right: 1px solid var(--line);
}

.brand {
  margin-bottom: 18px;
}

.brand-title {
  display: block;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 1.15rem;
  font-weight: 750;
  line-height: 1.2;
  text-decoration: none;
}

.brand-subtitle {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.85rem;
}

.search-label {
  display: block;
  color: var(--muted);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.search {
  width: 100%;
  margin: 6px 0 18px;
  padding: 10px 12px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  font: 0.95rem Inter, ui-sans-serif, system-ui, sans-serif;
}

.toc-group {
  margin: 0 0 16px;
}

.toc-heading {
  display: block;
  padding: 8px 4px 6px;
  color: #514a42;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.toc-link {
  display: block;
  padding: 6px 8px;
  color: #37322c;
  border-radius: 6px;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.9rem;
  line-height: 1.35;
  text-decoration: none;
}

.toc-link:hover,
.toc-link.active {
  color: #161411;
  background: rgba(164, 73, 52, 0.12);
}

.content {
  min-width: 0;
  padding: 44px 24px 72px;
}

.page {
  width: min(820px, 100%);
  margin: 0 auto;
}

.page h1,
.page h2,
.page h3 {
  color: #181512;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  line-height: 1.2;
}

.page h1 {
  margin: 0 0 10px;
  font-size: clamp(2.2rem, 4vw, 4.6rem);
  letter-spacing: 0;
}

.page h2 {
  margin-top: 44px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  font-size: 1.65rem;
}

.page h3 {
  margin-top: 30px;
  font-size: 1.18rem;
}

.lede {
  color: #4e463e;
  font-size: 1.22rem;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 28px;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 4px 10px;
  color: #3e352d;
  background: #eadac4;
  border: 1px solid #d6c2a8;
  border-radius: 999px;
  font: 0.82rem Inter, ui-sans-serif, system-ui, sans-serif;
}

.cover {
  width: 100%;
  margin: 18px 0 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 45px rgba(77, 57, 33, 0.18);
}

.callout {
  margin: 26px 0;
  padding: 18px 20px;
  background: #efe4d1;
  border: 1px solid #d7c4a9;
  border-left: 5px solid var(--accent-2);
  border-radius: 6px;
}

.module-card,
.capstone-card {
  margin: 18px 0;
  padding: 18px 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.concept {
  margin: 20px 0;
}

.concept h3 {
  margin-bottom: 6px;
}

.diagram {
  color: #f8f0df;
  background: #1f2927;
  border: 1px solid #3e5d57;
}

.table-wrap {
  overflow-x: auto;
  margin: 18px 0 28px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  border: 1px solid var(--line);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.94rem;
  line-height: 1.45;
}

th,
td {
  padding: 12px 14px;
  border: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
}

th {
  background: #eadac4;
  color: #2c261f;
}

.module-card h3,
.capstone-card h3 {
  margin-top: 0;
}

ul,
ol {
  padding-left: 1.35rem;
}

li + li {
  margin-top: 0.3rem;
}

code,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

code {
  padding: 0.1em 0.28em;
  background: #eadfcf;
  border-radius: 4px;
  font-size: 0.92em;
}

pre {
  overflow: auto;
  padding: 16px;
  color: var(--code-ink);
  background: var(--code-bg);
  border-radius: 8px;
  line-height: 1.5;
}

pre code {
  padding: 0;
  color: inherit;
  background: transparent;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  width: min(820px, 100%);
  margin: 48px auto 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.pager a {
  max-width: 48%;
  padding: 10px 12px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.9rem;
  text-decoration: none;
}

.menu-button {
  display: none;
}

@media (max-width: 900px) {
  .shell {
    display: block;
  }

  .sidebar {
    position: fixed;
    inset: 0 0 0 auto;
    z-index: 10;
    width: min(86vw, 340px);
    transform: translateX(100%);
    transition: transform 160ms ease;
    box-shadow: -20px 0 45px rgba(35, 27, 18, 0.28);
  }

  body.nav-open .sidebar {
    transform: translateX(0);
  }

  .content {
    padding-top: 28px;
  }

  .menu-button {
    position: fixed;
    right: 14px;
    bottom: 14px;
    z-index: 15;
    display: inline-flex;
    padding: 10px 14px;
    color: #fffaf1;
    background: #2f2922;
    border: 0;
    border-radius: 999px;
    font: 0.9rem Inter, ui-sans-serif, system-ui, sans-serif;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.24);
  }
}

/* ── Inline markdown rendering ─────────────────────────────────── */

.page p strong {
  color: #181512;
  font-weight: 700;
}

.page p em {
  font-style: italic;
}

/* ── Callout blockquotes ─────────────────────────────────────────── */

blockquote.callout {
  margin: 22px 0;
  padding: 14px 18px 14px 20px;
  background: #eef6f5;
  border: 1px solid #b4d8d4;
  border-left: 5px solid var(--accent-2);
  border-radius: 6px;
  color: #1f3d3b;
  font-size: 0.97rem;
  line-height: 1.6;
}

blockquote.callout code {
  background: #d0ebe8;
}

/* ── Example note ─────────────────────────────────────────────────── */

.example-note {
  margin: 0 0 10px;
  padding: 10px 14px;
  background: #f3eedd;
  border-left: 4px solid var(--accent);
  border-radius: 4px;
  font-size: 0.92rem;
  color: #4a3f35;
}

/* ── Anti-pattern block ───────────────────────────────────────────── */

.anti-pattern-label {
  display: inline-block;
  margin: 18px 0 4px;
  padding: 5px 12px;
  background: #fce8e4;
  border: 1px solid #e8b9b1;
  border-radius: 4px;
  color: #8b2717;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.anti-pattern-fix {
  margin: 12px 0 0;
  padding: 12px 16px;
  background: #eaf4f0;
  border: 1px solid #b4d9cc;
  border-left: 4px solid #1d7a74;
  border-radius: 4px;
  font-size: 0.95rem;
  color: #1a3d35;
}