:root {
  color-scheme: light;
  --background: #f5f7f4;
  --surface: #ffffff;
  --text: #1d2a24;
  --muted: #59665f;
  --border: #d8e0da;
  --accent: #176b4d;
  --accent-dark: #0d4d37;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", "Yu Gothic", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
  color: var(--text);
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
}

.site-header {
  align-items: center;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 1.5rem;
  justify-content: space-between;
  padding: 1rem max(1.25rem, calc((100% - 860px) / 2));
}

.brand {
  color: var(--text);
  font-size: 1.15rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  justify-content: flex-end;
}

a {
  color: var(--accent);
  overflow-wrap: anywhere;
  text-underline-offset: 0.18em;
}

a:hover,
a:focus-visible {
  color: var(--accent-dark);
}

main {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  margin: 2rem auto;
  max-width: 860px;
  padding: clamp(1.25rem, 4vw, 3rem);
}

h1,
h2,
h3 {
  line-height: 1.4;
  scroll-margin-top: 1rem;
}

h1 {
  font-size: clamp(1.7rem, 5vw, 2.3rem);
  margin: 0 0 1.5rem;
}

h2 {
  border-top: 1px solid var(--border);
  font-size: 1.35rem;
  margin: 2.5rem 0 1rem;
  padding-top: 1.5rem;
}

h3 {
  font-size: 1.1rem;
  margin: 1.8rem 0 0.75rem;
}

p,
li {
  overflow-wrap: anywhere;
}

ol,
ul {
  padding-left: 1.5rem;
}

li + li {
  margin-top: 0.45rem;
}

code {
  background: #edf2ee;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92em;
  padding: 0.12em 0.3em;
}

.table-scroll {
  overflow-x: auto;
  width: 100%;
}

table {
  border-collapse: collapse;
  font-size: 0.92rem;
  min-width: 660px;
  width: 100%;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.65rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: #edf2ee;
}

footer {
  color: var(--muted);
  margin: 2rem auto 3rem;
  max-width: 860px;
  padding: 0 1.25rem;
  text-align: center;
}

footer p {
  margin: 0.25rem 0;
}

@media (max-width: 640px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.75rem;
  }

  nav {
    justify-content: flex-start;
  }

  main {
    border-left: 0;
    border-radius: 0;
    border-right: 0;
    margin: 1rem 0;
  }
}

@media print {
  .site-header,
  footer {
    display: none;
  }

  main {
    border: 0;
    margin: 0;
    max-width: none;
    padding: 0;
  }
}