*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root { --ink: #111827; --ink-2: #4B5563; --mute: #6B7280; --paper: #FFFFFF; --line: #E5E7EB; --signal: #E4572E; }
body { font-family: 'Inter', system-ui, sans-serif; background: var(--paper); color: var(--ink); line-height: 1.7; -webkit-font-smoothing: antialiased; }
.top { border-bottom: 1px solid var(--line); background: #fff; }
.top .in { max-width: 820px; margin: 0 auto; padding: 0 20px; height: 68px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; color: var(--ink); line-height: 1.15; }
.brand-mark { width: 27px; height: 33px; flex-shrink: 0; }
.brand-txt { display: flex; flex-direction: column; }
.brand b { font-family: 'Inter', sans-serif; font-size: 18px; display: block; }
.brand-txt span { font-size: 12px; color: var(--mute); }
.back { color: var(--ink-2); text-decoration: none; font-size: 14px; font-weight: 500; }
.back:hover { color: var(--ink); }
main { max-width: 820px; margin: 0 auto; padding: 64px 20px 96px; }
h1 { font-family: 'Inter', sans-serif; font-weight: 600; font-size: clamp(36px, 6vw, 52px); letter-spacing: -.03em; line-height: 1.05; margin-bottom: 8px; }
.sub { color: var(--mute); font-size: 14px; margin-bottom: 48px; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
h2 { font-family: 'Inter', sans-serif; font-weight: 600; font-size: 21px; letter-spacing: -.01em; margin: 40px 0 12px; }
h3 { font-size: 16px; margin: 24px 0 8px; }
p, li { color: var(--ink-2); font-size: 15.5px; margin-bottom: 10px; }
ul { padding-left: 20px; }
a { color: var(--ink); }
.box { background: #F6F7F8; border-radius: 8px; padding: 22px 24px; margin-bottom: 8px; }
.box p { margin: 0; }
.todo { background: #FFF1C2; color: #6B4B00; padding: 0 4px; border-radius: 2px; font-weight: 500; }
footer { border-top: 1px solid var(--line); padding: 24px 20px; text-align: center; font-size: 13px; color: var(--mute); }
footer a { color: var(--mute); margin: 0 8px; }