:root {
  color-scheme: light;
  --ink: #14201e;
  --muted: #5c6966;
  --brand: #067865;
  --brand-dark: #035c4e;
  --mint: #dcefeb;
  --lavender: #e9e4f7;
  --rose: #f4dfe5;
  --line: rgba(20, 77, 68, 0.14);
  --paper: rgba(255, 255, 255, 0.84);
  --canvas: #f3f5f4;
  --shadow: 0 24px 70px rgba(20, 54, 48, 0.1);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Noto Sans KR", "Noto Sans JP", "Noto Sans SC", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 90% 4%, rgba(205, 190, 240, .5), transparent 28rem),
    radial-gradient(circle at 0 20%, rgba(133, 211, 194, .35), transparent 26rem),
    var(--canvas);
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-underline-offset: .2em; }
img { display: block; max-width: 100%; height: auto; }
.skip-link { position: fixed; left: 12px; top: 12px; z-index: 100; padding: 10px 15px; border-radius: 999px; background: #111; color: #fff; transform: translateY(-170%); }
.skip-link:focus { transform: translateY(0); }
.shell { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 40; border-bottom: 1px solid var(--line); background: rgba(243, 245, 244, .84); backdrop-filter: blur(22px) saturate(140%); }
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 18px; font-weight: 780; text-decoration: none; }
.brand img { width: 38px; height: 38px; border-radius: 11px; box-shadow: 0 8px 22px rgba(6, 120, 101, .18); }
.nav-links { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 8px; }
.nav-links a { padding: 8px 11px; border-radius: 999px; color: #42504d; font-size: 13px; font-weight: 680; text-decoration: none; }
.nav-links a:hover, .nav-links a:focus-visible { background: rgba(255, 255, 255, .8); outline: none; }
.nav-links .primary-link { background: var(--ink); color: #fff; }
.hero { min-height: 690px; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(390px, .95fr); align-items: center; gap: clamp(44px, 7vw, 90px); padding-block: 84px 102px; }
.eyebrow { margin: 0 0 16px; color: var(--brand-dark); font-size: 13px; font-weight: 820; letter-spacing: .1em; text-transform: uppercase; }
h1, h2, h3 { margin-top: 0; letter-spacing: -.045em; }
.hero h1 { max-width: 760px; margin-bottom: 25px; font-size: clamp(52px, 7vw, 88px); line-height: .99; }
.lead { max-width: 700px; margin: 0; color: var(--muted); font-size: clamp(18px, 2vw, 21px); line-height: 1.72; }
.button-row { display: flex; flex-wrap: wrap; gap: 11px; margin-top: 31px; }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 0 19px; border: 1px solid var(--line); border-radius: 14px; background: rgba(255, 255, 255, .76); font-size: 14px; font-weight: 760; text-decoration: none; }
.button.primary { border-color: var(--brand); background: var(--brand); color: #fff; box-shadow: 0 14px 32px rgba(6, 120, 101, .2); }
.button:focus-visible, .flow-node:focus-visible { outline: 3px solid rgba(6, 120, 101, .28); outline-offset: 3px; }
.workflow-visual { padding: 22px; border: 1px solid rgba(255,255,255,.76); border-radius: 34px; background: rgba(255,255,255,.58); box-shadow: var(--shadow); backdrop-filter: blur(18px); }
.app-icon { width: 90px; height: 90px; margin: 0 auto 24px; border-radius: 23px; box-shadow: 0 17px 38px rgba(12, 80, 68, .18); }
.flow-line { position: relative; display: grid; gap: 10px; }
.flow-line::before { position: absolute; top: 27px; bottom: 27px; left: 21px; width: 2px; background: linear-gradient(var(--brand), #816fbb, #c3617e); content: ""; }
.flow-node { position: relative; display: grid; grid-template-columns: 44px 1fr; gap: 13px; align-items: center; padding: 12px 14px; border: 1px solid var(--line); border-radius: 17px; background: rgba(255,255,255,.88); text-decoration: none; }
.flow-node b { display: grid; width: 44px; height: 44px; place-items: center; border-radius: 14px; background: var(--mint); color: var(--brand-dark); font-size: 13px; }
.flow-node:nth-child(3) b { background: var(--lavender); color: #55467a; }
.flow-node:nth-child(4) b { background: var(--rose); color: #7c3f54; }
.flow-node strong, .flow-node span { display: block; }
.flow-node span { color: var(--muted); font-size: 13px; }
.section { padding-block: 98px; border-top: 1px solid var(--line); }
.section-heading { max-width: 760px; margin-bottom: 36px; }
.section-heading h2 { margin-bottom: 18px; font-size: clamp(39px, 5vw, 64px); line-height: 1.02; }
.section-heading p { color: var(--muted); font-size: 17px; }
.module-grid, .principle-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.module-card, .principle-card, .step-card, .notice, .guide-nav, .guide-section { border: 1px solid var(--line); background: var(--paper); box-shadow: 0 12px 38px rgba(20, 54, 48, .05); }
.module-card { min-height: 300px; display: flex; flex-direction: column; padding: 26px; border-radius: 25px; }
.module-card .number { color: var(--brand); font-size: 12px; font-weight: 800; }
.module-card h3 { margin: auto 0 13px; font-size: 29px; }
.module-card p { margin: 0; color: var(--muted); }
.module-card ul { margin: 14px 0 0; padding-left: 18px; color: var(--muted); }
.operations { display: grid; grid-template-columns: .72fr 1.28fr; gap: 32px; align-items: start; }
.step-list { display: grid; gap: 11px; }
.step-card { display: grid; grid-template-columns: 46px 1fr; gap: 14px; padding: 17px; border-radius: 18px; }
.step-card b { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 50%; background: var(--brand); color: #fff; }
.step-card h3 { margin: 0 0 4px; font-size: 18px; }
.step-card p { margin: 0; color: var(--muted); font-size: 15px; }
.principle-card { padding: 25px; border-radius: 22px; }
.principle-card h3 { margin-bottom: 10px; }
.principle-card p { margin: 0; color: var(--muted); }
.notice { margin-top: 26px; padding: 24px 26px; border-left: 5px solid var(--brand); border-radius: 18px; }
.notice strong { display: block; margin-bottom: 5px; }
.notice p { margin: 0; color: var(--muted); }
.cta { margin-block: 100px; display: grid; grid-template-columns: 1fr auto; gap: 30px; align-items: center; padding: clamp(32px, 6vw, 60px); border-radius: 30px; background: #13201e; color: #fff; }
.cta h2 { margin: 0 0 9px; font-size: clamp(32px, 4vw, 50px); }
.cta p { max-width: 700px; margin: 0; color: #b8c4c1; }
.cta .button { background: #fff; color: #14201e; }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); }
.footer-inner { min-height: 160px; display: flex; align-items: center; justify-content: space-between; gap: 26px; }
.footer-inner p { margin: 5px 0 0; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 15px; }
.footer-links a { font-size: 13px; font-weight: 680; }

.guide-hero { padding-block: 76px 54px; }
.guide-hero h1 { max-width: 800px; margin-bottom: 18px; font-size: clamp(48px, 7vw, 80px); line-height: 1; }
.guide-layout { display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: 28px; padding-bottom: 110px; }
.guide-nav { position: sticky; top: 92px; align-self: start; display: grid; gap: 4px; padding: 14px; border-radius: 21px; }
.guide-nav a { padding: 10px 12px; border-radius: 11px; color: #40504c; font-size: 14px; font-weight: 680; text-decoration: none; }
.guide-nav a:hover { background: var(--mint); }
.guide-content { display: grid; gap: 18px; }
.guide-section { padding: clamp(24px, 4vw, 42px); border-radius: 25px; scroll-margin-top: 92px; }
.guide-section h2 { margin-bottom: 15px; font-size: clamp(29px, 4vw, 43px); }
.guide-section h3 { margin: 27px 0 8px; font-size: 21px; }
.guide-section p, .guide-section li { color: var(--muted); }
.guide-section ol, .guide-section ul { padding-left: 22px; }
.guide-section li + li { margin-top: 9px; }
.callout { margin-top: 20px; padding: 17px 19px; border-radius: 15px; background: var(--mint); color: #28443e; }
.callout.lavender { background: var(--lavender); color: #4e4567; }
.callout strong { display: block; margin-bottom: 4px; }

@media (max-width: 900px) {
  .hero, .operations { grid-template-columns: 1fr; }
  .workflow-visual { width: min(100%, 620px); }
  .module-grid, .principle-grid { grid-template-columns: 1fr; }
  .module-card { min-height: 230px; }
  .guide-layout { grid-template-columns: 1fr; }
  .guide-nav { position: static; display: flex; overflow-x: auto; }
  .guide-nav a { white-space: nowrap; }
}
@media (max-width: 640px) {
  .shell { width: min(100% - 28px, 1160px); }
  .site-header { position: static; }
  .nav { align-items: flex-start; padding-block: 12px; }
  .nav-links a:not(.primary-link) { display: none; }
  .hero { min-height: auto; padding-block: 58px 76px; }
  .hero h1 { font-size: 48px; }
  .section { padding-block: 74px; }
  .cta { grid-template-columns: 1fr; margin-block: 74px; }
  .footer-inner { align-items: flex-start; flex-direction: column; padding-block: 35px; }
  .footer-links { justify-content: flex-start; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }