:root { --brand: #2f7d5b; --brand-dark: #1e513c; --ink: #0f172a; --sub: #475569; --line: #e2e8f0; --bg: #f8fafc; }
* { box-sizing: border-box; }
body { margin: 0; font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", system-ui, sans-serif; color: var(--ink); background: #fff; line-height: 1.8; -webkit-text-size-adjust: 100%; }
a { color: var(--brand); }
header.hero { background: linear-gradient(135deg, var(--brand), var(--brand-dark)); color: #fff; padding: 40px 16px 48px; text-align: center; }
header.hero img { width: 72px; height: 72px; }
header.hero h1 { font-size: 28px; margin: 12px 0 4px; }
header.hero p.catch { font-size: 20px; font-weight: 700; color: #f5d27a; margin: 0; }
header.hero .sub { margin: 8px 0 24px; opacity: .92; }
.cta { display: inline-block; min-height: 48px; padding: 12px 28px; border-radius: 14px; background: #fff; color: var(--brand-dark); font-weight: 700; text-decoration: none; }
.cta.green { background: var(--brand); color: #fff; }
main { max-width: 760px; margin: 0 auto; padding: 8px 16px 48px; }
section { margin-top: 36px; }
h2 { font-size: 22px; border-left: 6px solid var(--brand); padding-left: 10px; margin: 0 0 12px; }
h3 { font-size: 17px; margin: 20px 0 6px; }
p, li { color: var(--sub); }
ul.features { list-style: none; padding: 0; display: grid; gap: 10px; }
ul.features li { background: var(--bg); border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; }
ul.features b { color: var(--ink); display: block; }
ol.steps { padding-left: 1.4em; }
ol.steps li { margin: 6px 0; }
.note { background: #fffbeb; border: 1px solid #fcd34d; border-radius: 14px; padding: 12px 14px; color: #78350f; }
details { border: 1px solid var(--line); border-radius: 14px; padding: 10px 14px; margin: 8px 0; }
summary { font-weight: 700; cursor: pointer; min-height: 32px; color: var(--ink); }
footer { border-top: 1px solid var(--line); padding: 24px 16px 40px; text-align: center; font-size: 14px; color: var(--sub); }
footer a { margin: 0 8px; display: inline-block; min-height: 44px; line-height: 44px; }
@media (min-width: 640px) { ul.features { grid-template-columns: 1fr 1fr; } header.hero h1 { font-size: 36px; } }
.center { text-align: center; margin-top: 40px; }
header.hero p { color: #fff; }