:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #1b1d24;
  --muted: #5d6270;
  --line: #e2e5ee;
  --accent: #1f4fd8;
  --accent-soft: #e8eefc;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1016;
    --surface: #171a22;
    --text: #e9ebf1;
    --muted: #a0a6b4;
    --line: #2a2f3b;
    --accent: #7ea2ff;
    --accent-soft: #1c2440;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

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;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 40px 16px 56px;
}

header.app {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

header.app img {
  width: 72px;
  height: 72px;
  flex: none;
}

header.app h1 {
  margin: 0;
  font-size: 24px;
  line-height: 1.4;
}

header.app p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 14px;
}

h2 {
  margin: 40px 0 12px;
  font-size: 19px;
  line-height: 1.5;
}

h3 {
  margin: 24px 0 4px;
  font-size: 16px;
}

p, ul, ol { margin: 0 0 12px; }

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

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

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

section.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 4px 20px 12px;
  margin-top: 16px;
}

.contact {
  background: var(--accent-soft);
  border-radius: 14px;
  padding: 16px 20px;
  margin-top: 16px;
}

.contact a {
  font-size: 18px;
  font-weight: 600;
  word-break: break-all;
}

.note {
  color: var(--muted);
  font-size: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 8px 0 16px;
}

th, td {
  text-align: left;
  vertical-align: top;
  padding: 8px 8px 8px 0;
  border-bottom: 1px solid var(--line);
}

th { font-weight: 600; white-space: nowrap; }

td code { word-break: break-all; }

footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

footer nav a { margin-right: 16px; }