:root {
      --background: #f7f8fa;
      --surface: #ffffff;
      --text: #273142;
      --subtext: #697586;
      --border: #e2e6eb;
      --accent: #3468a8;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      background: var(--background);
      color: var(--text);
      font-family:
        "Noto Sans JP", "Hiragino Kaku Gothic ProN",
        "Yu Gothic", Meiryo, sans-serif;
      font-size: 15px;
      line-height: 1.8;
    }

    a {
      color: var(--accent);
      text-decoration: none;
    }

    a:hover {
      text-decoration: underline;
    }

    .site-header {
      background: var(--surface);
      border-bottom: 1px solid var(--border);
    }

    .header-inner {
      max-width: 1080px;
      margin: auto;
      padding: 18px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .site-name {
      color: var(--text);
      font-size: 19px;
      font-weight: 700;
      white-space: nowrap;
    }

    .site-name:hover {
      text-decoration: none;
    }

    .navigation {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
    }

    .navigation a {
      color: var(--subtext);
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.04em;
    }

    .navigation a:hover {
      color: var(--accent);
    }

    .container {
      width: min(100% - 40px, 980px);
      margin: 0 auto;
    }

    main {
      padding: 38px 0 60px;
    }

    .intro {
      margin-bottom: 34px;
    }

    h1 {
      margin: 0 0 8px;
      font-size: 24px;
      font-weight: 600;
    }

    .intro p {
      margin: 0;
      color: var(--subtext);
      font-size: 14px;
    }

    section {
      margin-bottom: 45px;
      scroll-margin-top: 25px;
    }

    h2 {
      margin: 0 0 16px;
      padding-bottom: 10px;
      border-bottom: 1px solid var(--border);
      font-size: 17px;
      font-weight: 600;
      letter-spacing: 0.02em;
    }

    .section-description {
      margin: 0 0 18px;
      color: var(--subtext);
      font-size: 13px;
    }

    .card-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 16px;
    }

    .card {
      min-width: 0;
      padding: 23px;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 6px;
    }

    .card h3 {
      margin: 0 0 9px;
      font-size: 16px;
      font-weight: 600;
    }

    .card p {
      margin: 0 0 13px;
      color: var(--subtext);
      font-size: 13px;
    }

    .card .category {
      margin-bottom: 10px;
      color: var(--subtext);
      font-size: 11px;
      letter-spacing: 0.05em;
    }

    .card-link {
      display: inline-block;
      font-size: 13px;
      font-weight: 500;
    }

    .plain-box {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 6px;
      padding: 22px;
      color: var(--subtext);
      font-size: 13px;
    }

    .plain-box p {
      margin: 0 0 12px;
    }

    .plain-box p:last-child {
      margin-bottom: 0;
    }

    .site-footer {
      background: var(--surface);
      border-top: 1px solid var(--border);
      padding: 25px 20px;
      text-align: center;
      color: var(--subtext);
      font-size: 12px;
    }

    @media (max-width: 680px) {
      .header-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 13px;
      }

      .navigation {
        gap: 14px;
      }

      .navigation a {
        font-size: 11px;
      }

      .card-grid {
        grid-template-columns: 1fr;
      }

      main {
        padding-top: 26px;
      }

      h1 {
        font-size: 21px;
      }
    }

.navigation a[aria-current="page"] {
  color: var(--accent);
}

/* ジャンル別案内：カード全体をリンクとして操作できる */
.genre-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.genre-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  min-height: 190px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.genre-card:hover,
.genre-card:focus-visible {
  border-color: var(--accent);
  text-decoration: none;
}
.genre-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.genre-card h2 {
  margin: 0 0 12px;
  padding: 0;
  border: none;
  font-size: 16px;
}
.genre-card p {
  color: var(--subtext);
  font-size: 13px;
  margin: 0 0 16px;
}
.genre-link {
  margin-top: auto;
  font-size: 13px;
  color: var(--accent);
}
.category-back {
  margin-top: 24px;
  font-size: 13px;
}

/* 作品のサブタイトルと関連リンク */
.work-subtitle {
  display: block;
  margin-top: 3px;
  font-size: 0.86em;
  font-weight: 500;
}
.work-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
}