:root {
    --orange: #F39800;
    --orange-deep: #C97A00;
    --orange-soft: #FFF4E3;
    --blue: #0349D0;
    --blue-soft: #EAF0FC;
    --ink: #333333;
    --ink-sub: #7A7A7A;
    --line: #E6EAF0;
    --band: #F3F6FA;
    --card: #FFFFFF;
  }
  * { box-sizing: border-box; }
  html { -webkit-text-size-adjust: 100%; }
  body {
    margin: 0;
    background: #FFFFFF;
    color: var(--ink);
    font-family: "Noto Sans JP", "Hiragino Sans", "Hiragino Kaku Gothic ProN", sans-serif;
    font-weight: 400;
    line-height: 1.8;
  }
  a { color: inherit; }
  .wrap { max-width: 720px; margin: 0 auto; padding: 0 16px; }
  .en { font-family: "Lato", sans-serif; font-weight: 900; letter-spacing: .12em; }

  /* ヘッダー */
  header { padding: 20px 0 8px; }
  .brand { font-size: 12px; color: var(--ink-sub); margin: 0 0 14px; letter-spacing: .08em; }
  .hero {
    display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; object-position: 85% 50%;
    border-radius: 16px; background: #fff; margin: 0 0 20px;
  }
  .eyebrow { font-size: 13px; color: var(--orange); margin: 0 0 4px; }
  h1 { font-size: 25px; line-height: 1.5; margin: 0 0 12px; font-weight: 700; }
  .lead { margin: 0 0 8px; font-size: 15px; }
  .updated { font-size: 12px; color: var(--ink-sub); margin: 0; }

  /* 絞り込み */
  .filter { margin: 24px 0 0; padding: 16px; background: var(--band); border-radius: 16px; }
  .filter-label { font-size: 13px; color: var(--ink-sub); margin: 0 0 10px; font-weight: 500; }
  .chips { display: flex; flex-wrap: wrap; gap: 8px; }
  .filter-row + .filter-row { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
  .chip {
    font: inherit; font-size: 14px; font-weight: 500;
    padding: 6px 16px; border-radius: 100px;
    border: 1.5px solid var(--line); background: var(--card); color: var(--ink);
    cursor: pointer;
  }
  .chip[aria-pressed="true"] { background: var(--blue); border-color: var(--blue); color: #fff; font-weight: 700; }
  .chip:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; }

  /* セクション */
  section { margin: 40px 0; }
  .sec-head { margin: 0 0 16px; }
  .sec-head .en { display: block; font-size: 12px; color: var(--orange); line-height: 1.4; }
  h2 { font-size: 20px; margin: 0; font-weight: 700; line-height: 1.5; }
  #none { margin-top: 24px; }
  .empty {
    background: var(--band); border-radius: 16px;
    padding: 20px; font-size: 14px; color: var(--ink-sub); margin: 0;
  }

  /* カード共通 */
  .card {
    background: var(--card); border-radius: 16px; overflow: hidden;
    box-shadow: 0 2px 14px rgba(20, 40, 80, .08);
    margin-bottom: 20px;
  }
  .card-img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: #fff; border-bottom: 1px solid var(--line); }
  .card-body { padding: 18px 18px 20px; }
  .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
  .tag { font-size: 12px; padding: 1px 10px; border-radius: 100px; font-weight: 500; line-height: 1.8; }
  .tag.kind { background: var(--orange-soft); color: var(--orange-deep); font-weight: 700; }
  .tag.reward { background: var(--blue-soft); color: var(--blue); font-weight: 700; }
  .tag.target { background: var(--band); color: var(--ink-sub); }
  .title { display: flex; align-items: flex-start; gap: 12px; margin: 0 0 8px; }
  .title svg { width: 40px; height: 40px; flex: none; }
  .card h3 { font-size: 19px; line-height: 1.5; margin: 6px 0 0; font-weight: 700; }
  .catch { margin: 0 0 14px; font-size: 15px; }
  dl.meta { margin: 0 0 16px; display: grid; grid-template-columns: 5.5em 1fr; gap: 4px 10px; font-size: 14px; }
  dl.meta dt { color: var(--ink-sub); }
  dl.meta dd { margin: 0; }
  .note { font-size: 13px; color: var(--ink-sub); margin: 0 0 14px; }

  /* 1枚のカード内の日程リスト（単独カード用） */
  ul.sessions { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
  ul.sessions li {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    padding: 12px 0; border-bottom: 1px solid var(--line);
  }
  .when { font-size: 15px; font-weight: 700; line-height: 1.5; }
  .when small { display: block; font-weight: 400; font-size: 13px; color: var(--ink-sub); }

  /* まとめカード（種別ごとに1枚・中にイベントが並ぶ） */
  .group-head { display: flex; align-items: center; gap: 12px; padding: 16px 18px 6px; }
  .group-head svg { width: 40px; height: 40px; flex: none; }
  .group-head h3 { margin: 0; font-size: 18px; }
  .group-head .count { margin-left: auto; font-size: 13px; color: var(--ink-sub); white-space: nowrap; }
  ul.items { list-style: none; margin: 0; padding: 0 18px 6px; }
  li.item { padding: 14px 0; border-top: 1px solid var(--line); }
  .item-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
  .item-date { display: block; font-size: 13px; font-weight: 700; color: var(--orange-deep); line-height: 1.6; }
  .item-name { display: block; font-size: 16px; font-weight: 700; line-height: 1.55; margin: 2px 0; }
  .item-sub { display: block; font-size: 13px; color: var(--ink-sub); line-height: 1.6; }
  details.more { margin-top: 6px; }
  details.more summary { font-size: 13px; color: var(--blue); cursor: pointer; font-weight: 500; width: max-content; }
  details.more summary:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; }
  .more-body { margin-top: 10px; padding: 12px 14px; background: var(--band); border-radius: 12px; }
  .more-body .catch { font-size: 14px; margin-bottom: 10px; }
  .more-body dl.meta { margin-bottom: 0; font-size: 13px; }
  .more-body .tags { margin: 10px 0 0; }
  .more-body .note { margin: 10px 0 0; }

  /* ボタン */
  .btn {
    display: inline-block; flex-shrink: 0;
    text-decoration: none; text-align: center;
    background: var(--orange); color: #fff; font-weight: 700; font-size: 14px;
    padding: 8px 20px; border-radius: 100px; border: 0;
  }
  .btn:hover { background: var(--orange-deep); }
  .btn:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }
  .btn.wide { display: block; width: 100%; padding: 13px 16px; font-size: 15px; }
  .btn.disabled { background: var(--line); color: var(--ink-sub); pointer-events: none; }

  /* フッター */
  footer { margin-top: 48px; padding: 24px 0 40px; font-size: 13px; color: var(--ink-sub); border-top: 1px solid var(--line); }
  footer p { margin: 0 0 8px; }
  .back { display: inline-block; margin-top: 6px; color: var(--ink); font-weight: 500; }

  @media (min-width: 640px) {
    header { padding-top: 28px; }
    .hero { aspect-ratio: 16 / 9; object-position: 50% 50%; }
    h1 { font-size: 30px; }
    .card-body { padding: 22px 26px 24px; }
    .group-head { padding: 20px 26px 8px; }
    ul.items { padding: 0 26px 8px; }
  }