:root {
  --green: #167c68;
  --green-dark: #0e5548;
  --ink: #18312c;
  --muted: #5d716c;
  --paper: #f7fbf9;
  --line: #dcebe5;
  --white: #fff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: -apple-system, BlinkMacSystemFont, "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif; line-height: 1.8; }
a { color: var(--green-dark); }
.site-header { background: var(--white); border-bottom: 1px solid var(--line); }
.nav { max-width: 1100px; margin: auto; padding: 1rem 1.25rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { color: var(--green-dark); font-size: 1.35rem; font-weight: 800; letter-spacing: .08em; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: .75rem 1.1rem; font-size: .9rem; }
nav a { text-decoration: none; }
.container { max-width: 1000px; margin: auto; padding: 0 1.25rem; }
.hero { padding: 5.5rem 0 4.5rem; background: linear-gradient(140deg, #e8f7f1, #f7fbf9 65%); }
.eyebrow { color: var(--green); font-weight: 700; letter-spacing: .08em; }
h1 { margin: .4rem 0 1rem; font-size: clamp(2.2rem, 6vw, 4.3rem); line-height: 1.2; letter-spacing: -.03em; }
h2 { margin-top: 0; font-size: clamp(1.55rem, 3vw, 2.2rem); line-height: 1.35; }
h3 { margin-bottom: .35rem; line-height: 1.4; }
.lead { max-width: 680px; font-size: 1.15rem; color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.75rem; }
.button { display: inline-block; border-radius: 999px; padding: .65rem 1.25rem; border: 1px solid var(--green); color: var(--green-dark); text-decoration: none; font-weight: 700; background: var(--white); }
.button.primary { color: var(--white); background: var(--green); }
.button.disabled { opacity: .65; cursor: not-allowed; }
section { padding: 4rem 0; }
.section-intro { max-width: 670px; color: var(--muted); }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.card { background: var(--white); border: 1px solid var(--line); border-radius: 1rem; padding: 1.35rem; }
.card p { margin-bottom: 0; color: var(--muted); }
.steps { counter-reset: step; display: grid; gap: 1rem; }
.step { display: grid; grid-template-columns: 2.6rem 1fr; gap: 1rem; align-items: start; }
.step::before { counter-increment: step; content: counter(step); display: grid; place-items: center; width: 2.6rem; height: 2.6rem; border-radius: 50%; color: var(--white); background: var(--green); font-weight: 800; }
.step h3 { margin-top: .15rem; }
.faq { border-top: 1px solid var(--line); padding: 1.1rem 0; }
.faq:last-child { border-bottom: 1px solid var(--line); }
.faq h3 { margin-top: 0; }
.note { padding: 1rem 1.2rem; border-left: 4px solid var(--green); background: #edf8f4; }
.prose { max-width: 760px; }
.prose li { margin: .35rem 0; }
.site-footer { margin-top: 3rem; background: #eaf4f0; border-top: 1px solid var(--line); }
.footer-inner { max-width: 1100px; margin: auto; padding: 2rem 1.25rem; display: flex; justify-content: space-between; gap: 1rem; align-items: start; }
.footer-inner small { color: var(--muted); }
@media (max-width: 700px) { .nav { align-items: flex-start; flex-direction: column; } nav { gap: .45rem .8rem; } .hero { padding: 3.8rem 0 3rem; } section { padding: 3rem 0; } .grid { grid-template-columns: 1fr; } .footer-inner { flex-direction: column; } }