:root {
  color: #171717;
  background: #f7f7f4;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  --bg: #f7f7f4;
  --surface: #ffffff;
  --text: #171717;
  --muted: #666a70;
  --border: #daddd8;
  --soft: #ecede8;
  --primary: #0f766e;
  --primary-dark: #115e59;
  --warning: #b45309;
  --danger: #b42318;
  --shadow: 0 24px 70px rgba(23, 23, 23, 0.09);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.74) 0%, rgba(247, 247, 244, 0) 320px),
    var(--bg);
  color: var(--text);
}

a {
  color: inherit;
}

p,
li {
  color: #42454a;
  line-height: 1.68;
}

.site-header,
.site-footer,
.guide-hero,
.guide-layout,
.guide-band {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  border-bottom: 1px solid rgba(218, 221, 216, 0.88);
  background: rgba(247, 247, 244, 0.84);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
}

.brand strong,
.site-footer strong {
  display: block;
  font-size: 15px;
}

.brand small,
.site-footer p {
  display: block;
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13px;
}

nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 14px;
}

nav a,
.button,
.card-link {
  text-decoration: none;
}

.nav-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: 8px;
  font-weight: 760;
}

.nav-cta {
  padding: 0 14px;
  background: var(--text);
  color: #fff;
}

.guide-hero {
  display: grid;
  gap: 22px;
  padding: 72px 0 46px;
}

.eyebrow {
  margin: 0;
  color: var(--primary);
  font-size: 13px;
  font-weight: 850;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--text);
  letter-spacing: 0;
}

h1 {
  max-width: 920px;
  font-size: clamp(42px, 6vw, 72px);
  line-height: 0.98;
}

h2 {
  font-size: clamp(28px, 3.6vw, 44px);
  line-height: 1.06;
}

h3 {
  font-size: 20px;
  line-height: 1.2;
}

.hero-lead {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 19px;
}

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

.button {
  gap: 10px;
  padding: 0 18px;
  border: 1px solid transparent;
}

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

.button--secondary {
  border-color: var(--border);
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
}

.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 42px;
  align-items: start;
  padding: 24px 0 78px;
}

.article,
.sidebar-card,
.guide-card,
.callout,
.detail-box,
.source-list {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 12px 34px rgba(23, 23, 23, 0.04);
}

.article {
  padding: clamp(22px, 4vw, 42px);
}

.article > * + * {
  margin-top: 24px;
}

.article h2 {
  padding-top: 10px;
}

.article h3 {
  margin-top: 26px;
}

.article p,
.article li {
  font-size: 16px;
}

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

.article li + li {
  margin-top: 8px;
}

.callout {
  padding: 18px;
  border-left: 4px solid var(--primary);
  background: #f8fbfa;
}

.callout strong {
  display: block;
  margin-bottom: 6px;
}

.warning {
  border-left-color: var(--warning);
  background: #fffaf2;
}

.detail-box {
  padding: 18px;
  background: #fbfbfa;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 0 0 74px;
}

.guide-card {
  display: grid;
  gap: 12px;
  min-height: 230px;
  padding: 22px;
}

.guide-card p {
  margin: 0;
}

.card-link {
  display: inline-flex;
  margin-top: auto;
  color: var(--primary);
  font-weight: 800;
}

.sidebar {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 14px;
}

.sidebar-card {
  padding: 18px;
}

.sidebar-card h2,
.sidebar-card h3 {
  font-size: 18px;
}

.sidebar-card p,
.sidebar-card li {
  font-size: 14px;
}

.sidebar-card ul {
  margin: 12px 0 0;
  padding-left: 18px;
}

.source-list {
  padding: 18px;
}

.source-list a {
  color: var(--primary);
  font-weight: 700;
}

.site-footer {
  display: grid;
  grid-template-columns: minmax(220px, 0.7fr) minmax(220px, 0.55fr) 1fr;
  gap: 24px;
  align-items: start;
  padding: 30px 0 42px;
  border-top: 1px solid var(--border);
}

.footer-links {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
}

.footer-disclaimer {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

@media (max-width: 860px) {
  .site-header,
  .site-footer,
  .guide-layout {
    display: grid;
  }

  .site-header {
    gap: 14px;
    padding: 12px 0;
  }

  nav {
    flex-wrap: wrap;
    gap: 12px;
  }

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

  .sidebar {
    position: static;
  }

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

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