:root {
  --ink: #171717;
  --muted: #66615b;
  --paper: #f4f1eb;
  --card: #fff;
  --line: #ded8ce;
  --accent: #8a351f;
  --dark: #201914;
  font-family: system-ui, -apple-system, "Noto Sans JP", sans-serif;
  color: var(--ink);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); line-height: 1.8; }
a { color: var(--accent); text-underline-offset: 3px; }
.shell { width: min(960px, calc(100% - 32px)); margin-inline: auto; }
.hero { padding: 72px 0 76px; background: linear-gradient(125deg, #181512, #513324); color: #fff; }
.hero-inner { text-align: center; }
.eyebrow, .section-label { margin: 0; font-size: .76rem; font-weight: 900; letter-spacing: .18em; }
.eyebrow { color: #d9bd9d; }
.hero h1 { margin: .1em 0; font-size: clamp(2.65rem, 10vw, 5.5rem); line-height: 1.2; }
.lead { margin: 14px auto 28px; color: #f4ece4; font-size: clamp(1rem, 3vw, 1.25rem); }
.button { display: inline-flex; min-height: 50px; align-items: center; justify-content: center; padding: 11px 24px; border-radius: 999px; font-weight: 900; text-decoration: none; }
.button-light { background: #fff; color: var(--dark); }
.button-dark { background: var(--dark); color: #fff; }
.intro, .notes { padding: 72px 0; }
.section-label { color: var(--accent); }
h2 { margin: .15em 0 1em; font-size: clamp(1.8rem, 6vw, 2.7rem); line-height: 1.35; }
.prepare-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.prepare-grid article { padding: 25px; border: 1px solid var(--line); border-radius: 18px; background: var(--card); }
.prepare-grid span { color: var(--accent); font-size: .78rem; font-weight: 900; letter-spacing: .12em; }
.prepare-grid h3 { margin: 6px 0 4px; font-size: 1.1rem; }
.prepare-grid p { margin: 0; color: var(--muted); font-size: .92rem; }
.flow-section { padding: 72px 0; background: #fff; }
.steps { display: grid; gap: 14px; margin: 0; padding: 0; list-style: none; }
.steps li { display: grid; grid-template-columns: 58px 1fr; gap: 17px; padding: 23px; border: 1px solid var(--line); border-radius: 18px; background: #faf8f4; }
.step-number { display: grid; width: 52px; height: 52px; place-items: center; border-radius: 50%; background: var(--accent); color: #fff; font-size: 1.35rem; font-weight: 900; }
.steps h3 { margin: 0 0 4px; font-size: 1.15rem; }
.steps p { margin: 0; color: var(--muted); }
.notes ul { margin: 0; padding: 24px 24px 24px 46px; border-left: 5px solid var(--accent); border-radius: 12px; background: #fff; }
.notes li + li { margin-top: 7px; }
.cta { padding: 68px 0; background: #e8ded2; text-align: center; }
.cta h2 { margin-bottom: .35em; }
.cta p:not(.section-label) { margin: 0 auto 24px; color: var(--muted); }
footer { padding: 25px 0; background: #222; color: #ddd; font-size: .8rem; text-align: center; }

@media (max-width: 680px) {
  .shell { width: min(100% - 22px, 960px); }
  .hero { padding: 54px 0 58px; }
  .intro, .notes, .flow-section { padding: 54px 0; }
  .prepare-grid { grid-template-columns: 1fr; gap: 10px; }
  .prepare-grid article { padding: 19px; }
  .steps li { grid-template-columns: 44px 1fr; gap: 12px; padding: 18px 15px; }
  .step-number { width: 42px; height: 42px; font-size: 1.08rem; }
  .steps h3 { font-size: 1.05rem; }
  .steps p { font-size: .9rem; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }