:root { color-scheme: light; --ink:#142b27; --muted:#53635f; --green:#13866f; --pale:#eaf6f1; --line:#dce6e1; --paper:#fff; }
* { box-sizing:border-box; }
body { margin:0; background:#f5f8f6; color:var(--ink); font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif; line-height:1.8; }
header { background:var(--paper); border-bottom:1px solid var(--line); }
nav { max-width:920px; margin:auto; padding:18px 24px; display:flex; justify-content:space-between; align-items:center; gap:20px; }
.brand { color:var(--ink); font-weight:800; text-decoration:none; }
nav .links { display:flex; gap:18px; flex-wrap:wrap; }
a { color:var(--green); }
nav a { font-size:.94rem; font-weight:700; }
main { max-width:840px; margin:42px auto 72px; padding:0 24px; }
.hero { background:var(--paper); border:1px solid var(--line); border-radius:24px; padding:38px; box-shadow:0 8px 32px #133b270a; }
.kicker { color:var(--green); font-weight:800; letter-spacing:.04em; }
h1 { font-size:clamp(1.8rem,5vw,2.6rem); line-height:1.35; margin:.4rem 0 1rem; }
h2 { margin:2rem 0 .4rem; font-size:1.2rem; }
p, li { color:var(--muted); }
.card { margin-top:18px; padding:20px 24px; background:var(--pale); border-radius:16px; }
.button { display:inline-block; margin-top:14px; padding:12px 20px; background:var(--green); color:white; text-decoration:none; font-weight:800; border-radius:12px; }
footer { border-top:1px solid var(--line); background:white; padding:22px 24px; color:var(--muted); font-size:.9rem; }
footer div { max-width:840px; margin:auto; display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px; }
small { color:var(--muted); }
@media(max-width:600px) { nav { align-items:flex-start; flex-direction:column; } main { margin-top:22px; padding:0 14px; } .hero { padding:25px 20px; } }