* { box-sizing: border-box; }
  html, body { margin: 0; padding: 0; background: var(--surface-page); }
  body { font-family: var(--font-body); }
  a { color: var(--text-accent); text-decoration: none; }
  a:hover { color: var(--accent-hover); }
  img { max-width: 100%; display: block; }
  /* Shared site header — full spec in 01-header-component.md */
  .site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,0.82); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--border-subtle); }
  .site-header .bar { max-width: 1160px; margin: 0 auto; padding: 12px 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
  .site-header .logo { display: flex; align-items: center; gap: 10px; }
  .site-header .wordmark { font-family: var(--font-display); font-weight: 700; font-size: 18px; letter-spacing: -0.02em; color: var(--text-primary); }
  .site-header .nav-desktop { display: flex; align-items: center; gap: 28px; }
  .site-header .nav-desktop a { font-family: var(--font-body); font-weight: 500; font-size: 14.5px; color: var(--text-secondary); transition: color 0.2s ease; }
  .site-header .nav-desktop a:hover { color: var(--blue-600); }
  .site-header .nav-burger { display: none; align-items: center; justify-content: center; width: 42px; height: 42px; border: 1px solid var(--border-subtle); background: var(--white); border-radius: 10px; cursor: pointer; color: var(--text-primary); }
  @media (max-width: 720px) { .site-header .nav-desktop { display: none !important; } .site-header .nav-burger { display: inline-flex !important; } }

  /* File retention page */
  .pe-doc { max-width: 720px; margin: 0 auto; padding: 64px 32px 96px; }
  .pe-doc-meta { color: var(--text-muted); margin: 0 0 40px; }
  .pe-doc-sections { display: flex; flex-direction: column; gap: 32px; }
  .pe-doc h2 { color: var(--text-primary); margin: 0 0 10px; }
  .pe-doc p { color: var(--text-secondary); margin: 0 0 10px; }
  .pe-doc p:last-child { margin-bottom: 0; }
  .pe-doc-table { list-style: none; margin: 14px 0 16px; padding: 0; border: 1px solid var(--border-subtle); border-radius: 14px; overflow: hidden; }
  .pe-doc-table li { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 6px 18px; padding: 14px 18px; border-bottom: 1px solid var(--border-subtle); }
  .pe-doc-table li:last-child { border-bottom: 0; }
  .pe-doc-table b { color: var(--text-primary); white-space: nowrap; }
  .pe-doc-back { display: inline-block; margin-top: 40px; }