:root {
  --color-text: #18181b;
  --color-muted: #71717a;
  --color-bg: #f3f4f6;
  --color-surface: #f8fafc;
  --color-border: #e2e8f0;
  --font-sans: system-ui, 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  --font-mono: ui-monospace, monospace;
  --content-width: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: var(--font-sans);
  line-height: 1.6;
}

a {
  color: inherit;
}

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

.header__title {
  margin: 0;
  font-size: 1.5rem;
}

.button {
  padding: 0.5rem 1.25rem;
  color: #fff;
  font-size: 0.875rem;
  text-decoration: none;
  background: var(--color-text);
  border-radius: 0.375rem;
}

.main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2.5rem 1rem 5rem;
}

.card {
  padding: 1.25rem 1.5rem 2rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
}

.card__title {
  margin: 0 0 1rem;
}

.code {
  overflow: auto;
  margin: 0;
  padding: 1.5rem;
  color: #fff;
  font-family: var(--font-mono);
  background: #1e293b;
  border-radius: 1rem;
}

.footer {
  padding: 1rem;
  color: var(--color-muted);
  font-size: 0.875rem;
  text-align: center;
}

[data-anim] {
  transition:
    opacity 0.6s,
    translate 0.6s;
}

[data-anim]:not(.is-visible) {
  opacity: 0;
  translate: 0 1rem;
}