:root {
  color-scheme: light;
  font-family: system-ui, -apple-system, "Noto Sans JP", sans-serif;
  --green: #147a3d;
  --green-dark: #0e5b2d;
  --green-soft: #e9f5ed;
  --ink: #17231b;
  --muted: #607066;
  --line: #dce7df;
  --danger: #b42318;
  --danger-soft: #fff2f0;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: linear-gradient(155deg, #edf7f0, #f8faf8 46%, #edf3ef); color: var(--ink); }
a { color: var(--green-dark); text-underline-offset: 3px; }
a:hover, a:focus-visible { color: var(--green); }
.shell { width: min(820px, calc(100% - 32px)); margin: 0 auto; padding: 24px 0 42px; }
.back-nav { margin-bottom: 12px; }
.back-nav a { display: inline-block; padding: 7px 2px; font-weight: 750; text-decoration: none; }
.hero, .panel { border: 1px solid var(--line); background: rgba(255,255,255,.97); box-shadow: 0 10px 34px rgba(23,55,34,.08); }
.hero { display: flex; align-items: center; gap: 17px; padding: 24px; border-radius: 20px; }
.hero img { width: 64px; height: 64px; border-radius: 17px; box-shadow: 0 5px 18px rgba(20,122,61,.18); }
.hero h1 { margin: 0; font-size: clamp(1.45rem, 5vw, 2rem); line-height: 1.3; }
.hero p { margin: 7px 0 0; color: var(--muted); line-height: 1.55; }
.hero .eyebrow { margin: 0 0 3px; color: var(--green); font-size: .83rem; font-weight: 800; }
.panel { margin-top: 16px; padding: 23px; border-radius: 18px; }
.panel h2, .notice h2, .sources h2 { margin: 0; font-size: 1.22rem; }
.rules { display: grid; gap: 11px; margin: 17px 0 0; padding-left: 1.45rem; line-height: 1.65; }
.rules li::marker { color: var(--green); font-weight: 800; }
.section-heading { display: flex; align-items: flex-start; gap: 12px; }
.section-heading p { margin: 5px 0 0; color: var(--muted); line-height: 1.55; }
.danger-mark { display: inline-flex; width: 32px; height: 32px; flex: 0 0 32px; align-items: center; justify-content: center; border-radius: 50%; background: var(--danger); color: white; font-weight: 900; }
.item-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin: 19px 0 0; padding: 0; list-style: none; }
.item-list li { padding: 10px 11px; border: 1px solid #efd4d0; border-radius: 9px; background: var(--danger-soft); font-size: .9rem; font-weight: 700; }
.size-note { margin: 17px 0 0; padding: 12px 14px; border-radius: 10px; background: #f4f7f5; color: #435249; font-size: .87rem; line-height: 1.55; }
.notice { margin-top: 16px; padding: 20px 22px; border: 1px solid #ecd58b; border-radius: 16px; background: #fff9e7; color: #5f4b0b; }
.notice h2 { color: #704f00; }
.notice p { margin: 8px 0 0; line-height: 1.65; }
.sources { margin-top: 22px; padding: 4px; }
.sources ul { display: flex; gap: 8px 22px; flex-wrap: wrap; margin: 11px 0; padding-left: 1.25rem; }
.sources p { margin: 0; color: var(--muted); font-size: .78rem; line-height: 1.55; }

@media (max-width: 620px) {
  .shell { width: min(100% - 20px, 820px); padding-top: 12px; }
  .hero { align-items: flex-start; gap: 12px; padding: 19px 17px; }
  .hero img { width: 50px; height: 50px; border-radius: 13px; }
  .panel { padding: 19px 16px; }
  .item-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .item-list li { padding: 9px 8px; font-size: .82rem; }
  .notice { padding: 18px 16px; }
}