:root {
  --bg: #f4efe6;
  --paper: #fffaf2;
  --paper-strong: #fffdf9;
  --ink: #1f2933;
  --muted: #5c6773;
  --brand: #0f766e;
  --brand-strong: #115e59;
  --accent: #d97706;
  --line: #e6dccd;
  --shadow: 0 20px 50px rgba(31, 41, 51, 0.08);
  --radius: 20px;
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(217, 119, 6, 0.12), transparent 28%),
    radial-gradient(circle at top right, rgba(15, 118, 110, 0.14), transparent 32%),
    linear-gradient(180deg, #f9f5ed 0%, var(--bg) 100%);
}

a {
  color: var(--brand-strong);
}

.page {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
  padding: 24px 0 56px;
}

.hero {
  background: linear-gradient(135deg, rgba(255, 250, 242, 0.96), rgba(255, 255, 255, 0.85));
  border: 1px solid rgba(230, 220, 205, 0.9);
  border-radius: 28px;
  box-shadow: var(--shadow);
  padding: 32px;
  margin-bottom: 24px;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.1);
  color: var(--brand-strong);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 0.96;
  letter-spacing: -0.03em;
}

.hero p {
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  border: 1px solid transparent;
}

.button--primary {
  background: var(--brand);
  color: #fff;
}

.button--secondary {
  background: rgba(255, 255, 255, 0.86);
  border-color: var(--line);
  color: var(--ink);
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
}

.sidebar,
.content-card,
.tile,
.notice {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.sidebar {
  position: sticky;
  top: 24px;
  align-self: start;
  padding: 18px;
}

.sidebar h2,
.content-card h2,
.tile h2 {
  margin-top: 0;
}

.nav-list,
.toc,
.checklist,
.plain-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-list li + li,
.toc li + li,
.checklist li + li,
.plain-list li + li {
  margin-top: 10px;
}

.nav-list a,
.toc a {
  display: block;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--ink);
  text-decoration: none;
  background: var(--paper-strong);
  border: 1px solid transparent;
}

.nav-list a:hover,
.toc a:hover {
  border-color: rgba(15, 118, 110, 0.2);
  color: var(--brand-strong);
}

.content-card {
  padding: 28px;
}

.content-card section + section {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.content-card h2 {
  font-size: 28px;
  margin-bottom: 10px;
}

.content-card h3 {
  margin-bottom: 8px;
  font-size: 20px;
}

.content-card p,
.content-card li {
  color: var(--muted);
  line-height: 1.7;
}

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

.tile {
  padding: 22px;
}

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

.notice {
  margin-top: 18px;
  padding: 16px 18px;
  background: rgba(217, 119, 6, 0.08);
}

.notice strong {
  color: #92400e;
}

.kicker {
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.footer {
  margin-top: 28px;
  color: var(--muted);
  font-size: 14px;
}

code {
  padding: 2px 6px;
  border-radius: 8px;
  background: rgba(31, 41, 51, 0.06);
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92em;
}

pre {
  overflow-x: auto;
  padding: 16px;
  border-radius: 14px;
  background: #1f2933;
  color: #f7fafc;
}

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

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

  .sidebar {
    position: static;
  }

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

  .hero {
    padding: 24px;
  }
}