:root {
    --paper: #ffffff;
    --ink: #16202e;
    --sub: #55617a;
    --ai: #1f3f6e;        /* 藍: サイトの基調色 */
    --ai-deep: #152c4f;
    --ai-pale: #edf2f8;
    --line: #c5d0de;
    --shu: #d23b1e;       /* 朱: 申込ボタン専用。ほかには使わない */
    --shu-deep: #a52b13;
    --mark: #fff1b8;
    --gothic: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
    --mincho: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", serif;
    --w: 560px;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
  body { font-family: var(--gothic); font-size: 17px; line-height: 1.85; color: var(--ink); background: #dfe5ee; }
  a { color: var(--ai); }
  a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid #f0a500; outline-offset: 2px; }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

  /* ===== 共通の枠 ===== */
  .page { max-width: var(--w); margin: 0 auto; background: var(--paper); min-height: 100vh; }
  .pr { font-size: 13px; line-height: 1; color: var(--ink); background: #f3f3f3; padding: 7px 16px; letter-spacing: .08em; }
  .head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; padding: 12px 16px; border-bottom: 2px solid var(--ai); }
  .site-name { font-family: var(--mincho); font-size: 22px; font-weight: 700; letter-spacing: .12em; color: var(--ai-deep); text-decoration: none; }
  .nav { font-size: 14.5px; }
  .nav a { margin-left: 14px; }
  .crumb { font-size: 13.5px; color: var(--sub); padding: 10px 16px 0; }
  .crumb a { color: var(--sub); }
  .body { padding: 20px 16px 32px; }
  .body p { margin-bottom: 1.1em; }
  .body h1 { font-family: var(--mincho); font-size: 27px; line-height: 1.5; letter-spacing: .04em; color: var(--ai-deep); margin-bottom: 16px; }
  .body h2 { font-size: 20px; line-height: 1.5; margin: 36px 0 14px; padding-bottom: 8px; border-bottom: 3px solid var(--ai); }
  .body ol, .body ul { margin: 0 0 1.1em 1.4em; }
  .body li { margin-bottom: .5em; }

  .foot { background: var(--ai-deep); color: #fff; padding: 20px 16px 28px; font-size: 13.5px; line-height: 1.7; }
  .foot ul { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 6px 12px; margin-bottom: 14px; }
  .foot a { color: #fff; }
  .foot .not-buyer { border-top: 1px solid rgba(255,255,255,.35); padding-top: 12px; }
  .foot .copy { margin-top: 10px; opacity: .8; }

  /* 確認日の印(このサイトの目印。事実の区画にだけ付ける) */
  .stamp { display: inline-block; border: 2px solid var(--ai); color: var(--ai); font-size: 12.5px; font-weight: 700; line-height: 1.35; padding: 4px 9px 3px; border-radius: 3px; text-align: center; letter-spacing: .06em; transform: rotate(-3deg); background: #fff; white-space: nowrap; flex-shrink: 0; }
  .stamp b { display: block; font-size: 14.5px; letter-spacing: .02em; }

  /* ボタン */
  .btn-apply { display: block; text-align: center; text-decoration: none; background: var(--shu); color: #fff; font-size: 19px; font-weight: 700; line-height: 1.4; padding: 15px 12px 13px; border-radius: 6px; border-bottom: 4px solid var(--shu-deep); }
  .btn-apply small { display: block; font-size: 13px; font-weight: 400; margin-top: 2px; }
  .btn-lp { display: block; text-align: center; text-decoration: none; background: var(--ai); color: #fff; font-size: 17px; font-weight: 700; padding: 14px 12px; border-radius: 6px; }

  /* ===== トップ・共通・記事 ===== */
  .items { list-style: none; margin: 0 !important; }
  .items li { border: 2px solid var(--ai); border-radius: 4px; margin-bottom: 10px; }
  .items a { display: block; padding: 14px; text-decoration: none; color: var(--ink); }
  .items strong { display: block; font-family: var(--mincho); font-size: 22px; color: var(--ai-deep); }
  .do { list-style: none; margin: 0 !important; counter-reset: d; }
  .do li { counter-increment: d; position: relative; padding: 0 0 14px 44px; }
  .do li::before { content: counter(d); position: absolute; left: 0; top: 3px; width: 30px; height: 30px; border: 2px solid var(--ai); color: var(--ai); font-weight: 700; display: flex; align-items: center; justify-content: center; border-radius: 3px; }
  .tbl { width: 100%; border-collapse: collapse; font-size: 16px; margin-bottom: 8px; }
  .tbl th, .tbl td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
  .tbl th { background: var(--ai-pale); width: 34%; font-weight: 700; }
  .ph { background: var(--mark); padding: 0 4px; font-size: 14.5px; }
  .art-meta { font-size: 13.5px; color: var(--sub); margin-bottom: 16px; }
  .related { border-top: 3px solid var(--ai); margin-top: 32px; padding-top: 14px; }
  .related h2 { border: 0; margin: 0 0 8px; padding: 0; font-size: 18px; }
  .related ul { list-style: none; margin: 0; }
  .related li { border-bottom: 1px solid var(--line); padding: 10px 0; margin: 0; }