:root {
  color-scheme: light;
  --background: #fff;
  --foreground: #212121;
  --muted: #eef3f1;
  --secondary-text: #5e5e5e;
  --border: #e1e5e3;
  --primary: #007154;
  --primary-hover: #005c44;
  --primary-light: #e2f4ee;
  --brand: #00a47a;
  --ink: #153b30;
  --font: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, system-ui, 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 2rem; }
body { margin: 0; background: var(--background); color: var(--foreground); font-family: var(--font); line-height: 1.7; word-break: keep-all; overflow-wrap: anywhere; }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 3px solid var(--primary); outline-offset: 6px; border-radius: 3px; }
p, h1, h2, h3 { margin: 0; }
.wrap { width: min(1200px, calc(100% - 80px)); margin-inline: auto; }
.mono, .eyebrow { font-family: var(--mono); }
.skip-link { position: absolute; top: -100px; left: 16px; z-index: 2; background: var(--primary); color: white; padding: 12px 20px; }
.skip-link:focus { top: 12px; }
.site-header { display: flex; align-items: center; gap: 32px; min-height: 104px; border-bottom: 1px solid var(--border); }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 750; letter-spacing: -.8px; white-space: nowrap; }
.brand-mark { display: grid; gap: 5px; width: 25px; }
.brand-mark i { display: block; width: 23px; height: 8px; background: var(--primary); border-radius: 2px; }
.brand-mark i:last-child { margin-left: 5px; width: 18px; }
.brand-version { align-self: flex-start; margin-top: 2px; font-size: 10px; color: var(--primary); letter-spacing: 0; }
.site-header nav { display: flex; gap: 28px; margin-left: auto; font-size: 14px; color: var(--secondary-text); }
.site-header nav a { display: inline-flex; align-items: center; min-height: 44px; padding-block: 12px; }
.site-header nav a:hover { color: var(--primary); }
.status { display: flex; align-items: center; gap: 7px; padding: 5px 11px; border: 1px solid var(--border); border-radius: 20px; font-size: 11px; }
.status span { width: 5px; height: 5px; border-radius: 50%; background: var(--primary); }
.hero { display: grid; grid-template-columns: 1.12fr 1fr; align-items: center; gap: 64px; padding-block: 88px 100px; }
.eyebrow { font-size: 11px; font-weight: 600; letter-spacing: 1.4px; color: var(--primary); }
h1 { margin-block: 24px; font-size: clamp(38px, 4.1vw, 58px); font-weight: 760; line-height: 1.25; letter-spacing: -2.8px; }
h1 span { color: var(--primary); }
.hero-description { color: var(--secondary-text); font-size: 16px; line-height: 1.9; }
.button { display: inline-flex; align-items: center; gap: 38px; margin-top: 32px; padding: 13px 19px; background: var(--primary); border: 1px solid var(--primary); border-radius: 5px; color: white; font-size: 14px; font-weight: 600; }
.button:hover { background: var(--primary-hover); }
.button span { font-size: 20px; }
.hero-note { margin-top: 19px; font-size: 11px; color: var(--secondary-text); }
.system-visual { border: 1px solid #c9d9d1; border-radius: 8px; background: #f5f8f6; padding: 24px; }
.visual-header { display: flex; align-items: center; justify-content: space-between; padding-bottom: 28px; color: var(--secondary-text); font-size: 10px; letter-spacing: 1px; }
.visual-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--brand); }
.visual-input { display: flex; justify-content: space-between; align-items: center; border: 1px solid var(--border); background: white; padding: 18px; border-radius: 5px; font-size: 13px; }
.visual-input strong { color: var(--primary); font-size: 20px; font-weight: 500; }
.connector { display: flex; justify-content: center; height: 42px; color: var(--primary); font-family: var(--mono); font-size: 23px; }
.hub-node { color: white; background: var(--ink); border: 1px solid var(--ink); border-radius: 5px; }
.hub-label { display: flex; flex-direction: column; gap: 6px; padding: 22px; }
.hub-label .mono { font-size: 9px; color: #b7e6d4; letter-spacing: 1.3px; }
.hub-label b { font-size: 28px; font-weight: 600; letter-spacing: -.5px; }
.hub-details { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid #426258; font-size: 10px; text-align: center; }
.hub-details span { padding: 10px 5px; border-right: 1px solid #426258; }
.hub-details span:last-child { border: 0; }
.visual-output { padding: 17px; border: 1px solid #c9d9d1; border-radius: 5px; background: white; }
.visual-output .mono { display: block; margin-bottom: 4px; color: var(--secondary-text); font-size: 9px; letter-spacing: 1px; }
.visual-output strong { font-size: 13px; font-weight: 550; }
.byte-ruler { display: grid; grid-template-columns: repeat(12, 1fr); gap: 3px; margin-top: 17px; }
.byte-ruler i { height: 13px; background: #d6e7de; border-left: 1px solid #89b6a2; }
.byte-ruler i:nth-child(3n) { background: #a2ceba; }
.visual-caption { margin-top: 20px; color: var(--secondary-text); text-align: center; font-size: 10px; }
.context-bar { background: var(--muted); border-block: 1px solid var(--border); }
.context-bar .wrap { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding-block: 22px; font-size: 12px; }
.context-bar span { color: var(--primary); font-family: var(--mono); font-size: 11px; white-space: nowrap; }
.context-bar b { margin-inline: 14px; font-weight: 400; color: #859c91; }
.flow-section, .delivery-section { padding-block: 100px; }
.section-heading h2 { margin-top: 22px; font-size: clamp(27px, 3vw, 38px); font-weight: 700; letter-spacing: -1.6px; line-height: 1.4; }
.section-heading > p:last-child { margin-top: 22px; font-size: 14px; color: var(--secondary-text); }
.flow-line { display: grid; grid-template-columns: repeat(4, 1fr); list-style: none; margin: 48px 0 0; padding: 0; border: 1px solid var(--border); border-radius: 6px; }
.flow-line li { position: relative; padding: 24px; border-right: 1px solid var(--border); }
.flow-line li:last-child { border-right: 0; }
.flow-line li:not(:last-child)::after { content: '→'; position: absolute; top: 65px; right: -9px; z-index: 1; color: #5a776a; background: white; font-family: var(--mono); }
.flow-index { display: block; font-family: var(--mono); font-size: 10px; color: var(--secondary-text); margin-bottom: 18px; }
.flow-line strong { font-size: 17px; font-weight: 650; }
.flow-line p { margin-top: 8px; font-size: 11px; color: var(--secondary-text); }
.flow-type { display: block; margin-top: 28px; font-size: 10px; color: var(--secondary-text); }
.flow-line .flow-hub { background: var(--primary-light); border-top: 3px solid var(--primary); padding-top: 21px; }
.flow-hub strong, .flow-hub .flow-type { color: var(--primary); }
.section-caption { margin-top: 18px; font-size: 11px; color: var(--secondary-text); }
.guardrail-section { padding-block: 88px; background: #f5f8f6; border-block: 1px solid var(--border); }
.guardrail-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; }
.guardrail-section h2 span { color: var(--primary); }
.principles article { display: grid; grid-template-columns: 30px 1fr; gap: 20px; padding-block: 26px; border-bottom: 1px solid #d6e0da; }
.principles article:first-child { padding-top: 0; }
.principles article:last-child { padding-bottom: 0; border-bottom: 0; }
.principle-number { padding-top: 5px; font: 11px var(--mono); color: var(--primary); }
.principles h3 { font-size: 17px; font-weight: 650; }
.principles p { margin-top: 10px; font-size: 13px; color: var(--secondary-text); line-height: 1.9; }
.delivery-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 44px; }
.delivery-list article { border-top: 2px solid var(--primary); padding-top: 22px; }
.delivery-list .mono { font-size: 10px; color: var(--primary); letter-spacing: .6px; }
.delivery-list h3 { margin-block: 13px 8px; font-size: 22px; font-weight: 650; letter-spacing: -.5px; }
.delivery-list p { color: var(--secondary-text); font-size: 13px; }
.closing { padding-block: 60px 80px; border-top: 1px solid var(--border); }
.closing h2 { margin-block: 20px; font-size: clamp(26px, 3.2vw, 40px); line-height: 1.45; font-weight: 650; letter-spacing: -1.6px; }
.closing > p:not(.eyebrow) { color: var(--secondary-text); font-size: 13px; }
.text-link { display: inline-flex; gap: 40px; margin-top: 22px; color: var(--primary); font-size: 13px; font-weight: 600; padding-block: 8px; }
.site-footer { display: flex; justify-content: space-between; align-items: center; gap: 25px; padding-block: 26px; border-top: 1px solid var(--border); color: var(--secondary-text); font-size: 10px; }
.footer-brand { color: var(--foreground); font-size: 16px; }
.footer-brand small { color: var(--secondary-text); font-size: 9px; font-weight: 450; letter-spacing: 0; }
.error-page { min-height: 75vh; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; }
.error-page h1 { font-size: 44px; }
.error-page p { color: var(--secondary-text); }
@media (max-width: 960px) {
  .wrap { width: calc(100% - 48px); }
  .site-header { gap: 18px; }
  .site-header nav { gap: 18px; }
  .hero { gap: 32px; padding-block: 64px; }
  h1 { font-size: 40px; letter-spacing: -2px; }
  .hero-description { font-size: 14px; }
  .system-visual { padding: 18px; }
  .guardrail-layout { gap: 40px; }
  .flow-line li { padding-inline: 17px; }
}
@media (max-width: 700px) {
  .wrap { width: calc(100% - 40px); }
  .site-header { min-height: 80px; flex-wrap: wrap; padding-block: 16px; gap: 16px; }
  .site-header nav { order: 3; width: 100%; margin: 0; gap: 24px; font-size: 12px; }
  .site-header nav a { padding-block: 4px; }
  .status { margin-left: auto; }
  .hero { grid-template-columns: 1fr; gap: 40px; padding-block: 48px 56px; }
  h1 { font-size: clamp(32px, 7.5vw, 48px); letter-spacing: -1.8px; }
  .hero-description { font-size: 14px; }
  .system-visual { padding: 24px; }
  .context-bar .wrap { flex-direction: column; align-items: flex-start; gap: 10px; padding-block: 20px; }
  .context-bar p { font-size: 11px; }
  .context-bar b { margin-inline: 10px; }
  .flow-section, .delivery-section { padding-block: 60px; }
  .flow-line { grid-template-columns: 1fr 1fr; margin-top: 32px; }
  .flow-line li { padding: 22px; border-bottom: 1px solid var(--border); }
  .flow-line li:nth-child(2) { border-right: 0; }
  .flow-line li:nth-child(3), .flow-line li:nth-child(4) { border-bottom: 0; }
  .flow-line .flow-hub { padding-top: 19px; }
  .flow-line li::after { display: none; }
  .flow-line strong { font-size: 15px; }
  .flow-line p { font-size: 10px; }
  .guardrail-section { padding-block: 60px; }
  .guardrail-layout { grid-template-columns: 1fr; gap: 36px; }
  .delivery-list { grid-template-columns: 1fr; gap: 28px; }
  .closing { padding-block: 44px 56px; }
  .site-footer { flex-wrap: wrap; gap: 12px 24px; }
  .site-footer p { width: 100%; order: 3; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }