:root {
  --color-primary: #0969da;
  --color-primary-light: #0969da;
  --color-background: #ffffff;
  --color-section-bg: #eaeef2;
  --color-surface: rgba(255, 255, 255, 0.75);
  --color-text: #000000;
  --color-text-white: #ffffff;
  --color-text-muted: #475569;
  --color-border: #000000;
  --container-width: 1280px;
  --container-padding: 120px;
  --font-family: 'Noto Sans JP', sans-serif;
  --transition-default: 200ms ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-background);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img,
video {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

main {
  display: block;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

@media (max-width: 1024px) {
  :root {
    --container-padding: 48px;
  }
}

@media (max-width: 640px) {
  :root {
    --container-padding: 24px;
  }
}