:root {
  color-scheme: light;
  --bg: #f7f8fa;
  --panel: #ffffff;
  --text: #18202a;
  --muted: #5d6673;
  --line: #d8dee8;
  --accent: #0f6b78;
  --accent-dark: #084b55;
  --code: #eef3f5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.58;
}

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

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

nav a {
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
}

.page {
  width: min(1040px, calc(100% - 40px));
  margin: 0 auto;
  padding: 42px 0 64px;
}

h1, h2, h3 {
  line-height: 1.2;
}

h1 {
  font-size: 2.5rem;
  margin: 0 0 18px;
}

h2 {
  margin-top: 42px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

p, li {
  max-width: 78ch;
}

.lede {
  color: var(--muted);
  font-size: 1.15rem;
  max-width: 76ch;
}

.callout {
  border-left: 4px solid var(--accent);
  background: var(--panel);
  padding: 16px 18px;
  margin: 24px 0;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.metric {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.metric strong {
  display: block;
  font-size: 1.4rem;
}

.metric span {
  color: var(--muted);
  font-size: 0.9rem;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 18px 0 28px;
  background: var(--panel);
  font-size: 0.95rem;
}

th, td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: right;
  vertical-align: top;
}

th:first-child,
td:first-child {
  text-align: left;
}

th {
  background: #eef2f4;
}

img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

code {
  background: var(--code);
  padding: 0.1rem 0.28rem;
  border-radius: 4px;
}

pre {
  background: #17212b;
  color: #edf5f7;
  padding: 16px;
  overflow-x: auto;
  border-radius: 8px;
}

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

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 22px clamp(20px, 5vw, 64px);
  background: var(--panel);
}

@media (max-width: 640px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  h1 {
    font-size: 2rem;
  }

  table {
    display: block;
    overflow-x: auto;
  }
}