:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --text: #1b2433;
  --text-secondary: #495a72;
  --primary: #2f5fd0;
  --border: #dde3ec;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141c;
    --surface: #171e29;
    --text: #e8edf5;
    --text-secondary: #a7b3c6;
    --primary: #8fb0ff;
    --border: #2a3444;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-text-size-adjust: 100%;
}

header,
main,
footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  padding-top: 32px;
}

.brand {
  color: var(--primary);
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.02em;
}

main {
  margin-top: 16px;
  margin-bottom: 48px;
  padding: 24px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
}

@media (min-width: 640px) {
  main {
    padding: 40px 48px;
  }
}

h1 {
  margin: 0 0 8px;
  font-size: 1.6rem;
  line-height: 1.4;
}

h2 {
  margin: 40px 0 8px;
  font-size: 1.15rem;
  line-height: 1.5;
}

p,
ul,
ol {
  margin: 8px 0;
}

ul,
ol {
  padding-left: 1.4em;
}

li + li {
  margin-top: 4px;
}

a {
  color: var(--primary);
  overflow-wrap: anywhere;
}

.meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
}

th,
td {
  padding: 12px 8px;
  border-top: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  width: 32%;
  color: var(--text-secondary);
  font-weight: 600;
}

@media (max-width: 520px) {
  th,
  td {
    display: block;
    width: 100%;
  }

  th {
    border-top: 1px solid var(--border);
    padding-bottom: 0;
  }

  td {
    border-top: none;
    padding-top: 4px;
  }
}

.links {
  list-style: none;
  padding: 0;
}

.links li {
  margin: 0;
  border-top: 1px solid var(--border);
}

.links a {
  display: block;
  padding: 14px 4px;
  text-decoration: none;
  font-weight: 600;
}

footer {
  padding-bottom: 32px;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

footer a {
  color: var(--text-secondary);
}