:root { --ink: #161A20; --sub: #4A5260; --line: #DCE1E8; --acc: #2563EB; --bg: #FFFFFF; --soft: #F4F6F9; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: "Segoe UI", "Noto Sans JP", "Yu Gothic UI", sans-serif; line-height: 1.7; }
main { max-width: 820px; margin: 0 auto; padding: 32px 20px 64px; }
header h1 { font-size: 34px; margin: 0 0 4px; }
header p { color: var(--sub); margin: 0 0 20px; }
.hero { width: 100%; border: 1px solid var(--line); border-radius: 12px; }
nav { background: var(--soft); border-radius: 12px; padding: 14px 20px; margin: 24px 0; }
nav ol { margin: 0; padding-left: 20px; }
h2 { font-size: 24px; margin: 44px 0 10px; padding-top: 8px; border-top: 1px solid var(--line); }
h3 { font-size: 18px; margin: 24px 0 6px; }
.step { display: flex; gap: 14px; margin: 14px 0; }
.step b.n { flex: 0 0 32px; height: 32px; border-radius: 50%; background: var(--acc); color: #fff; display: flex; align-items: center; justify-content: center; }
.step div { flex: 1; }
.note { background: #EEF4FF; border-left: 4px solid var(--acc); padding: 10px 14px; border-radius: 6px; margin: 12px 0; }
.warn { background: #FFF7E6; border-left: 4px solid #D99A1E; padding: 10px 14px; border-radius: 6px; margin: 12px 0; }
kbd { border: 1px solid #B9C0CA; border-bottom-width: 2px; border-radius: 4px; padding: 0 6px; font-family: Consolas, monospace; font-size: 0.92em; background: #fff; }
.menu { font-weight: 600; }
table { border-collapse: collapse; width: 100%; margin: 10px 0; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--soft); }
.qr { width: 260px; border: 1px solid var(--line); border-radius: 8px; }
footer { color: var(--sub); font-size: 13px; margin-top: 48px; border-top: 1px solid var(--line); padding-top: 12px; }
@media print { nav { display: none; } h2 { break-after: avoid; } }