:root {
  color-scheme: dark;
  --bg: #05070c;
  --panel: rgba(255, 255, 255, 0.07);
  --line: rgba(255, 255, 255, 0.14);
  --text: #f5f7fb;
  --muted: #b7bfcc;
  --blue: #1f9bff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% 0%, rgba(31, 155, 255, 0.18), transparent 34rem),
    linear-gradient(145deg, #07101d, var(--bg) 58%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  line-height: 1.75;
}

.wrap {
  width: min(980px, calc(100% - 36px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

header {
  padding: 34px 0 28px;
  border-bottom: 1px solid var(--line);
}

.brand {
  margin: 0 0 12px;
  font-size: clamp(34px, 8vw, 64px);
  letter-spacing: 0;
  line-height: 1;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

a {
  color: #8dcbff;
}

nav a,
.button {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.06);
}

main {
  display: grid;
  gap: 22px;
  padding-top: 30px;
}

section {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

h1,
h2,
h3 {
  margin: 0 0 14px;
  line-height: 1.3;
}

h1 {
  font-size: clamp(30px, 5vw, 44px);
}

h2 {
  font-size: 24px;
}

p,
ul,
ol,
dl {
  margin: 0 0 14px;
}

ul,
ol {
  padding-left: 1.3rem;
}

li + li {
  margin-top: 8px;
}

dl {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: 10px 18px;
}

dt {
  color: var(--muted);
}

dd {
  margin: 0;
}

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

footer {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 680px) {
  .wrap {
    width: min(100% - 28px, 980px);
    padding-top: 24px;
  }

  section {
    padding: 20px;
  }

  dl {
    grid-template-columns: 1fr;
    gap: 2px;
  }
}