:root {
  --bg: #f6f1e8;
  --paper: #fffdf8;
  --ink: #1e2c2a;
  --muted: #667572;
  --line: #d9d2c6;
  --accent: #0f766e;
  --accent-soft: #d9f1ee;
  --accent-strong: #134e4a;
  --shadow: 0 24px 60px rgba(18, 34, 31, 0.08);
  --font-sans: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.08), transparent 24rem),
    linear-gradient(180deg, #faf7f1 0%, var(--bg) 100%);
  color: var(--ink);
  font-family: var(--font-sans);
}

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

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 22rem 1fr;
}

.sidebar {
  border-right: 1px solid var(--line);
  padding: 2rem 1.25rem;
  background: rgba(255, 253, 248, 0.86);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.brand-block h1,
.content-topbar h2,
.doc-content h1,
.doc-content h2,
.doc-content h3 {
  font-family: var(--font-serif);
}

.brand-block h1 {
  margin: 0.35rem 0 0.75rem;
  font-size: 2rem;
  line-height: 1.1;
}

.sidebar-copy,
.hero-note p,
.doc-content p,
.doc-content li {
  line-height: 1.7;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.76rem;
  font-weight: 700;
}

.meta-card,
.hero-note,
.doc-nav a,
.content-topbar,
.doc-content {
  box-shadow: var(--shadow);
}

.meta-card {
  margin: 1.5rem 0;
  padding: 1rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
  background: var(--paper);
  display: grid;
  gap: 0.35rem;
}

.meta-label {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.doc-nav {
  display: grid;
  gap: 0.85rem;
}

.doc-nav-section {
  display: grid;
  gap: 0.85rem;
}

.doc-nav-heading {
  margin: 0.25rem 0 -0.15rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  font-weight: 700;
}

.doc-nav a {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 1rem;
  border-radius: 1rem;
  background: var(--paper);
  border: 1px solid var(--line);
}

.doc-nav a.active {
  border-color: rgba(15, 118, 110, 0.45);
  background: linear-gradient(180deg, var(--accent-soft), #f6fffd);
}

.doc-nav-title {
  display: block;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.doc-nav-meta,
.doc-nav-summary {
  display: block;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.content-shell {
  padding: 2rem;
}

.content-topbar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.5rem;
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 1.25rem;
}

.content-topbar h2 {
  margin: 0.35rem 0 0;
  font-size: 2.2rem;
  line-height: 1.1;
}

.doc-meta {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.doc-meta span {
  background: #eef5f4;
  color: var(--accent-strong);
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
}

.hero-note {
  margin: 1rem 0 1.25rem;
  background: linear-gradient(135deg, #fff6df, #fffdf8);
  border: 1px solid #eadfbe;
  border-radius: 1.25rem;
  padding: 1rem 1.15rem;
}

.hero-note strong {
  display: block;
  margin-bottom: 0.35rem;
}

.doc-content {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  padding: 2rem;
}

.doc-content h1 {
  font-size: 2.25rem;
  line-height: 1.1;
  margin-top: 0;
}

.doc-content h2 {
  margin-top: 2rem;
  font-size: 1.6rem;
}

.doc-content h3 {
  margin-top: 1.5rem;
  font-size: 1.2rem;
}

.doc-content p,
.doc-content li {
  font-size: 1rem;
}

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

.table-wrap {
  overflow-x: auto;
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

.doc-content th,
.doc-content td {
  border: 1px solid var(--line);
  padding: 0.75rem;
  text-align: left;
  vertical-align: top;
}

.doc-content th {
  background: #f3f0ea;
}

.doc-content code {
  background: #eef5f4;
  color: #0b534d;
  border-radius: 0.35rem;
  padding: 0.08rem 0.35rem;
  font-size: 0.92em;
}

.doc-content pre {
  background: #172120;
  color: #f5fbfa;
  padding: 1rem;
  border-radius: 1rem;
  overflow-x: auto;
}

.doc-content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.doc-content blockquote {
  margin: 1rem 0;
  padding: 0.8rem 1rem;
  border-left: 4px solid var(--accent);
  background: #f3fbfa;
  color: #214442;
}

.doc-content hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2rem 0;
}

@media (max-width: 1024px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 720px) {
  .content-shell {
    padding: 1rem;
  }

  .content-topbar,
  .doc-content {
    padding: 1.2rem;
  }

  .content-topbar {
    flex-direction: column;
  }

  .content-topbar h2 {
    font-size: 1.8rem;
  }
}