:root {
  --color-bg: #fdfbf8;
  --color-bg-dark: #f7f6f2;
  --color-text: #2f2a24;
  --color-text-muted: #6f665b;
  --color-heading: #26211c;
  --color-border: #e4dacb;
  --color-card: #ffffff;
  --color-accent: #e6843a;
  --color-accent-dark: #e85f1c;
  --color-section-index: #a39e9a;
  --font-sans: "Noto Sans JP", sans-serif;
  --font-serif: "Noto Serif JP", serif;
}

html {
  scroll-behavior: smooth;
}
  
  body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.8;
    letter-spacing: 0.04em;
  }
  
  img {
    max-width: 100%;
    height: auto;
    vertical-align: bottom;
  }
  
  a {
    color: inherit;
    text-decoration: none;
  }
  
  button {
    font: inherit;
  }
  
  h1,
  h2,
  h3,
  p {
    margin: 0;
  }
  
  ul,
  ol {
    margin: 0;
    padding: 0;
    list-style: none;
  }
  
  * {
    box-sizing: border-box;
  }
  
  .section-index {
    font-family: var(--font-serif);
    color: var(--color-section-index);
  }
  
  .section h2 {
    font-family: var(--font-serif);
    color: var(--color-heading);
  }
  
  .section p {
    color: var(--color-text-muted);
  }
  
  .button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-width: 116px;
    height: 36px;
    padding: 0 18px;
    border: 1px solid var(--color-border);
    border-radius: 2px;
    background: transparent;
    color: var(--color-text);
    font-size: 12px;
    font-weight: 500;
    line-height: 1;
    letter-spacing: 0.04em;
    transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.button::after {
    content: "→";
    font-size: 11px;
    color: var(--color-text-muted);
    transition: color 0.25s ease;
}

.button:hover {
    background: var(--color-border);
    border-color: var(--color-border);
    color: var(--color-text);
}

.button:hover::after {
    color: var(--color-text);
}

.button.primary {
  min-width: 150px;
  height: 42px;
  padding: 0 18px;
  border: 1px solid var(--color-accent);
  border-radius: 4px;
  background: var(--color-accent);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.04em;
}

.button.primary::after {
  color: #fff;
}

.button.primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: #fff;
}