:root {
  --bg: #f5f1e8;
  --paper: #fffdf8;
  --ink: #22201c;
  --muted: #6c6257;
  --line: #d8ccbc;
  --accent: #a64b2a;
  --accent-soft: #f4dfd2;
  --nav: #efe5d6;
  --code: #2b2722;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top right, #f9e6d9 0, transparent 26%),
    linear-gradient(180deg, #f7f3eb 0%, var(--bg) 100%);
  line-height: 1.65;
}

a {
  color: var(--accent);
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  padding: 28px 22px;
  background: linear-gradient(180deg, var(--nav), #e7d9c6);
  border-right: 1px solid var(--line);
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  margin: 0 0 8px;
  font-size: 28px;
  line-height: 1.1;
}

.tagline {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 14px;
}

.nav-group {
  margin-bottom: 18px;
}

.nav-group-title {
  margin: 0 0 8px;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.nav-link {
  display: block;
  padding: 8px 10px;
  margin-bottom: 6px;
  border-radius: 10px;
  color: var(--ink);
  text-decoration: none;
}

.nav-link.active,
.nav-link:hover {
  background: rgba(255, 255, 255, 0.72);
}

.content {
  padding: 40px 48px 64px;
}

.content p,
.content li {
  font-size: 17px;
}

.hero,
.card,
.note,
.code-block,
.checklist {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 8px 20px rgba(79, 61, 45, 0.05);
}

.hero {
  padding: 34px;
  margin-bottom: 28px;
}

.hero h1,
.content h1 {
  margin-top: 0;
  line-height: 1.15;
}

.hero p.lead {
  font-size: 20px;
  color: #433b33;
  margin-bottom: 18px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.button {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid var(--accent);
}

.button.primary {
  background: var(--accent);
  color: #fff7f3;
}

.button.secondary {
  background: var(--accent-soft);
  color: var(--accent);
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 28px;
}

.card {
  padding: 22px;
}

.card h3 {
  margin-top: 0;
}

.section {
  margin-bottom: 28px;
}

.split {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 18px;
  margin-bottom: 28px;
}

.section h2 {
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
}

.note,
.checklist {
  padding: 18px 20px;
}

.note strong {
  color: var(--accent);
}

.code-block {
  padding: 18px 20px;
  overflow-x: auto;
}

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

pre {
  margin: 0;
  white-space: pre-wrap;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}

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

th {
  background: #f3ecdf;
}

ul,
ol {
  padding-left: 22px;
}

.footer {
  margin-top: 40px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 960px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .content {
    padding: 24px 18px 48px;
  }

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

  .split {
    grid-template-columns: 1fr;
  }
}