:root {
  --paper: #f3f1ec;
  --blue: #25324b;
  --font-sans: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--blue); font-family: var(--font-sans); line-height: 1.6; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--blue); color: var(--paper); }
.shell { width: min(100% - 48px, 860px); margin-inline: auto; }

.site-header { display: flex; align-items: center; justify-content: space-between; height: 80px; border-bottom: 1px solid var(--blue); }
.brand { font-size: 17px; font-weight: 700; letter-spacing: -.03em; }
.site-nav { display: flex; gap: 28px; font: 600 11px var(--font-mono); }
.site-nav a { border-bottom: 1px solid transparent; padding-bottom: 3px; transition: border-color .2s; }
.site-nav a:hover { border-color: currentColor; }

.hero { padding: 88px 0 60px; border-bottom: 1px solid var(--blue); }
.eyebrow { display: flex; align-items: center; gap: 8px; font: 600 10px var(--font-mono); letter-spacing: .08em; text-transform: uppercase; opacity: .6; }
.hero h1 { margin: 22px 0 20px; font-size: clamp(42px, 7vw, 64px); line-height: .98; font-weight: 650; letter-spacing: -.04em; }
.hero p { max-width: 540px; margin: 0 0 36px; font-size: 17px; line-height: 1.65; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.button { display: inline-flex; align-items: center; gap: 10px; padding: 13px 20px; border: 1px solid var(--blue); font: 600 12px var(--font-mono); transition: background .2s, color .2s; }
.button-primary { background: var(--blue); color: var(--paper); }
.button-primary:hover { background: transparent; color: var(--blue); }
.button-outline:hover { background: var(--blue); color: var(--paper); }

.section { padding: 52px 0; border-bottom: 1px solid var(--blue); }
.section-label { margin: 0 0 18px; font: 600 10px var(--font-mono); letter-spacing: .08em; text-transform: uppercase; opacity: .6; }
.section h1, .section h2 { margin: 0 0 14px; font-size: 22px; font-weight: 650; letter-spacing: -.02em; }
.section p { margin: 0; max-width: 620px; font-size: 14px; line-height: 1.75; }

.page-hero { padding: 60px 0 44px; border-bottom: 1px solid var(--blue); }
.page-hero h1 { margin: 16px 0 0; font-size: clamp(34px, 5vw, 48px); font-weight: 650; letter-spacing: -.03em; }

.doc p { margin: 0; padding: 24px 0; border-bottom: 1px solid var(--blue); font-size: 14px; line-height: 1.8; }
.doc p:last-child { border-bottom: 0; }
.doc a { text-decoration: underline; text-underline-offset: 3px; }

.support-list { border-top: 1px solid var(--blue); }
.support-item { padding: 26px 0; border-bottom: 1px solid var(--blue); }
.support-item h2 { margin: 0 0 10px; font-size: 16px; font-weight: 650; }
.support-item p { margin: 0; font-size: 14px; line-height: 1.7; }
.support-item a { text-decoration: underline; text-underline-offset: 3px; font-weight: 600; }

.site-footer { padding: 46px 0 60px; }
.footer-row { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 14px; font: 600 10px var(--font-mono); }
.footer-row a { text-decoration: underline; text-underline-offset: 3px; }

@media (max-width: 640px) {
  .site-header { height: 68px; }
  .site-nav { gap: 16px; }
  .hero { padding: 56px 0 40px; }
  .page-hero { padding: 44px 0 32px; }
  .section { padding: 38px 0; }
}