:root {
  --us-ink: #12211f;
  --us-muted: #5f6f70;
  --us-border: #dce7e5;
  --us-surface: #f6faf9;
  --us-surface-strong: #e8f3f1;
  --us-teal: #0f766e;
  --us-coral: #b45339;
  --us-gold: #9a6b10;
}

body {
  letter-spacing: 0;
}

.content {
  max-width: 920px;
}

.sidebar-brand-text {
  font-weight: 760;
  letter-spacing: 0;
}

.sidebar-drawer {
  border-right: 1px solid var(--us-border);
}

.sidebar-tree .caption {
  color: var(--us-teal);
  font-size: 0.75rem;
  font-weight: 760;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.sidebar-tree a {
  border-radius: 6px;
  font-size: 0.94rem;
}

.toc-drawer {
  border-left: 1px solid var(--us-border);
}

h1,
h2,
h3 {
  letter-spacing: 0;
}

h1 {
  font-weight: 780;
}

h2 {
  border-bottom: 1px solid var(--us-border);
  padding-bottom: 0.35rem;
}

a {
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.hero {
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.12), rgba(180, 83, 57, 0.08)),
    var(--us-surface);
  border: 1px solid var(--us-border);
  border-radius: 14px;
  box-shadow: 0 16px 40px rgba(18, 33, 31, 0.08);
  margin: 0 0 1.4rem;
  padding: clamp(1.25rem, 2.4vw, 2rem);
}

.hero-kicker {
  color: var(--us-teal);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.075em;
  margin-bottom: 0.65rem;
  text-transform: uppercase;
}

.hero h1 {
  color: var(--us-ink);
  font-size: clamp(1.75rem, 3.25vw, 2.55rem);
  line-height: 1.12;
  margin: 0;
  max-width: 16em;
}

.hero p {
  color: var(--us-muted);
  font-size: 0.98rem;
  line-height: 1.58;
  margin: 0.95rem 0 0;
  max-width: 45rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.3rem;
}

.button {
  align-items: center;
  border-radius: 8px;
  display: inline-flex;
  font-size: 0.92rem;
  font-weight: 700;
  justify-content: center;
  min-height: 2.25rem;
  padding: 0.45rem 0.82rem;
  text-decoration: none;
}

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

.button.primary:hover {
  background: #115e59;
  color: #fff;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--us-border);
  color: var(--us-ink);
}

.button.secondary:hover {
  border-color: var(--us-teal);
  color: var(--us-teal);
}

.value-grid {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 1.25rem 0 2rem;
}

.value-card {
  background: #fff;
  border: 1px solid var(--us-border);
  border-radius: 12px;
  color: var(--us-ink);
  display: block;
  min-height: 10rem;
  padding: 1rem;
  text-decoration: none;
  transition:
    border-color 150ms ease,
    box-shadow 150ms ease,
    transform 150ms ease;
}

.value-card:hover {
  border-color: rgba(15, 118, 110, 0.42);
  box-shadow: 0 12px 28px rgba(18, 33, 31, 0.1);
  color: var(--us-ink);
  transform: translateY(-1px);
}

.value-card span {
  color: var(--us-coral);
  display: block;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  margin-bottom: 0.45rem;
  text-transform: uppercase;
}

.value-card strong {
  display: block;
  font-size: 1.08rem;
  line-height: 1.32;
}

.value-card p {
  color: var(--us-muted);
  font-size: 0.94rem;
  line-height: 1.52;
  margin: 0.65rem 0 0;
}

.explain-strip {
  border: 1px solid var(--us-border);
  border-radius: 12px;
  display: grid;
  gap: 0;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 1rem 0 2rem;
  overflow: hidden;
}

.explain-strip div {
  background: var(--us-surface);
  border-right: 1px solid var(--us-border);
  padding: 1rem;
}

.explain-strip div:last-child {
  border-right: 0;
}

.explain-strip strong {
  color: var(--us-ink);
  display: block;
  font-size: 0.98rem;
  line-height: 1.25;
}

.explain-strip p {
  color: var(--us-muted);
  font-size: 0.88rem;
  line-height: 1.48;
  margin: 0.55rem 0 0;
}

.highlight {
  border-radius: 10px;
}

div[class^="highlight"] pre {
  border-radius: 10px;
  padding: 1rem;
}

code.literal {
  border-radius: 5px;
  padding: 0.08rem 0.26rem;
}

.admonition {
  border-radius: 10px;
}

@media (max-width: 800px) {
  .value-grid,
  .explain-strip {
    grid-template-columns: 1fr;
  }

  .explain-strip div {
    border-bottom: 1px solid var(--us-border);
    border-right: 0;
  }

  .explain-strip div:last-child {
    border-bottom: 0;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --us-ink: #e5f2ef;
    --us-muted: #a8bbb8;
    --us-border: #284441;
    --us-surface: #132522;
    --us-surface-strong: #19332f;
    --us-teal: #5eead4;
    --us-coral: #f1a48e;
    --us-gold: #e0b44a;
  }

  .hero,
  .value-card,
  .button.secondary {
    background-color: var(--us-surface);
  }

  .button.primary {
    background: #14b8a6;
    color: #081311;
  }

  .button.primary:hover {
    background: #2dd4bf;
    color: #081311;
  }
}