:root {
  --color-primary: #05c1c0;
  --color-primary-dark: #049a9a;
  --color-accent: #9b51e0;
  --color-yellow: #fdf63b;
  --color-text: #263238;
  --color-muted: #667085;
  --color-border: #d8eef0;
  --color-bg: #f7fbfb;
  --color-white: #ffffff;
  --shadow-soft: 0 12px 28px rgba(0, 83, 89, 0.12);
  --radius: 8px;
  --container: 1040px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-white);
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.8;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #007f85;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.35;
}

ul {
  padding-left: 1.35rem;
}

.container {
  width: min(100% - 32px, var(--container));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 1000;
  padding: 8px 12px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
}

.skip-link:focus {
  top: 16px;
}

.text-center {
  text-align: center;
}

.highlight {
  background: linear-gradient(transparent 62%, rgba(253, 246, 59, 0.85) 0%);
}

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

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  color: var(--color-white);
  background: var(--color-primary);
  border-radius: var(--radius);
  font-weight: 700;
  text-decoration: none;
}

.button:hover {
  color: var(--color-white);
  background: var(--color-primary-dark);
}