:root { --tint:#E9EEF2; --paper:#FFFDF7; --ink:#0B1118; --ink-soft:#46505C; --ink-mute:#8A93A0; --blue:#54A0FF; --blue-deep:#2F7FE8; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--tint); color: var(--ink); font-family: "Plus Jakarta Sans", Arial, sans-serif; line-height: 1.75; }
a { color: var(--blue-deep); font-weight: 600; text-decoration: none; }
a:hover { text-decoration: underline; }
.shell { width: min(760px, calc(100% - 40px)); margin: 0 auto; }

header { padding: 22px 0 0; background: transparent; border: none; }
.nav { min-height: 64px; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; gap: 18px; border: 3px solid var(--ink); border-radius: 20px; background: var(--paper); box-shadow: 0 10px 26px rgba(11,17,24,.08); }
.brand { color: var(--ink); font-size: 1.22rem; font-weight: 800; letter-spacing: -.04em; text-decoration: none; }
.brand span { color: var(--blue-deep); }
.back { color: var(--ink-soft); font-size: .9rem; font-weight: 800; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; }
.back::before { content: "←"; }
.back:hover { color: var(--ink); text-decoration: underline; }

main { display: block; }
main.shell { background: var(--paper); border: 3px solid var(--ink); border-radius: 28px; padding: 44px min(56px,7vw) 56px; margin: 28px auto 40px; box-shadow: 0 20px 50px rgba(11,17,24,.10); }

h1 { letter-spacing: -.055em; font-size: clamp(2.1rem, 5.4vw, 3.6rem); line-height: 1.05; margin: 0 0 8px; color: var(--ink); font-weight: 800; }
h2 { font-size: 1.2rem; letter-spacing: -.02em; margin: 38px 0 10px; color: var(--ink); font-weight: 800; }
p, li { color: var(--ink-soft); }
p { margin: 0 0 16px; }
ul { padding-left: 22px; }
.meta { color: var(--ink-mute); font-size: .88rem; }
.notice { background: var(--tint); border: 2px solid var(--ink); border-radius: 18px; color: var(--ink-soft); margin: 30px 0; padding: 18px 20px; font-weight: 600; }
.button { background: var(--blue); border: 2px solid var(--ink); border-radius: 999px; color: #fff; display: inline-block; font-weight: 800; padding: 12px 22px; text-decoration: none; }
.button:hover { background: var(--blue-deep); text-decoration: none; }

footer { border-top: 4px solid var(--ink); background: var(--ink); color: #A9BFD6; font-size: .82rem; padding: 26px 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.fbrand { color: #fff; font-size: 1.05rem; font-weight: 800; letter-spacing: -.04em; text-decoration: none; }
.fbrand span { color: var(--blue); }
.footer-links a { margin-right: 16px; color: #fff; font-weight: 800; text-decoration: none; }
.footer-links a:last-child { margin-right: 0; }
.footer-links a:hover { color: var(--blue); text-decoration: underline; }