:root {
  color-scheme: light;
  --paper: #faf8f2;
  --surface: #ffffff;
  --ink: #2e2f2f;
  --muted: #666666;
  --teal: #008080;
  --teal-dark: #006666;
  --teal-pale: #d3ecf1;
  --border: #e5e5e5;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", Arial, "Noto Sans JP", sans-serif;
  font-size: 17px;
  line-height: 1.7;
}

a { color: var(--teal-dark); }
a:hover { color: var(--teal); }
a:focus-visible { outline: 3px solid var(--teal); outline-offset: 4px; border-radius: 4px; }

.shell { width: min(100% - 32px, 760px); margin: 0 auto; padding: 48px 0 72px; }
.hero, .card { background: var(--surface); border: 1px solid var(--border); border-radius: 20px; }
.hero { padding: 32px; display: grid; grid-template-columns: 112px 1fr; gap: 24px; align-items: center; }
.icon { width: 112px; height: 112px; border-radius: 24px; display: block; }
.eyebrow { color: var(--teal-dark); font-weight: 700; margin: 0 0 4px; }
h1 { font-size: clamp(2rem, 7vw, 3rem); line-height: 1.2; margin: 0 0 8px; }
.lead { color: var(--muted); margin: 0; }
.card { padding: 28px; margin-top: 20px; }
h2 { font-size: 1.35rem; line-height: 1.35; margin: 0 0 14px; }
h3 { font-size: 1.05rem; margin: 24px 0 8px; }
p, ul { margin-top: 0; }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: 10px 22px; background: var(--teal); color: white; font-weight: 700; text-decoration: none; border-radius: 12px; }
.button:hover { background: var(--teal-dark); color: white; }
.note { background: var(--teal-pale); border-radius: 14px; padding: 16px 18px; }
footer { color: var(--muted); font-size: .9rem; text-align: center; margin-top: 32px; }

@media (max-width: 560px) {
  .shell { padding-top: 24px; }
  .hero { grid-template-columns: 72px 1fr; padding: 22px; gap: 16px; }
  .icon { width: 72px; height: 72px; border-radius: 17px; }
  .card { padding: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}