@charset "UTF-8";
:root{--paper:#f7f5f0;--paper-deep:#eeeae1;--ink:#142536;--ink-2:#1d3346;--text:#26343c;--muted:#56656b;--line:#d4d6cf;--bronze:#765d31;--gold:#b69a5a;--sage:#4f6664;--container:1200px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{margin:0;background:var(--paper);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Noto Sans KR","Malgun Gothic",sans-serif;line-height:1.6;word-break:keep-all;overflow-wrap:anywhere;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}img{max-width:100%;display:block}
:focus-visible{outline:3px solid var(--bronze);outline-offset:4px}
.container{width:min(var(--container),calc(100% - 96px));margin-inline:auto}
.skip-link{position:fixed;left:16px;top:12px;z-index:50;padding:12px 18px;background:var(--ink);color:var(--paper);transform:translateY(-200%)}.skip-link:focus{transform:none}

/* header */
.site-header{position:sticky;top:0;z-index:30;background:rgba(247,245,240,.96);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.header-inner{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:12px;min-height:44px}
.brand img{width:40px;height:40px;flex-shrink:0}
.brand-text strong{display:block;font-size:17px;letter-spacing:-.03em;color:var(--ink)}
.brand-text small{display:block;font-size:9px;letter-spacing:.14em;color:var(--bronze);margin-top:3px}
.desktop-nav{display:flex;gap:34px}
.desktop-nav a{font-size:14px;min-height:44px;display:flex;align-items:center;color:var(--ink)}
.desktop-nav a:hover{color:var(--bronze)}
.mobile-menu{display:none;position:relative}
.mobile-menu summary{list-style:none;cursor:pointer;min-height:44px;display:flex;align-items:center;gap:6px;font-size:14px;color:var(--ink)}
.mobile-menu summary::-webkit-details-marker{display:none}
.mobile-menu nav{position:absolute;right:0;top:52px;min-width:180px;background:var(--paper);border:1px solid var(--line);display:grid;padding:8px 0}
.mobile-menu nav a{padding:12px 20px;font-size:15px}

/* hero */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero-inner{position:relative;z-index:2;padding:112px 0 96px;max-width:var(--container)}
.hero-inner>*{max-width:620px}
.eyebrow{margin:0 0 26px;font-size:11px;font-weight:700;letter-spacing:.18em;color:var(--bronze)}
.hero h1{margin:0;font-size:clamp(40px,5.2vw,70px);line-height:1.2;letter-spacing:-.045em;font-weight:650;color:var(--ink)}
.hero h1 span{display:block}.hero h1 .accent{color:var(--sage)}
.lead{margin:30px 0 0;font-size:17px;line-height:1.85;color:var(--muted);max-width:520px}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:28px;margin-top:38px}
.button{display:inline-flex;align-items:center;gap:12px;min-height:48px;padding:12px 22px;font-size:14px;border:1px solid var(--ink)}
.button-primary{background:var(--ink);color:var(--paper)}.button-primary:hover{background:var(--ink-2)}
.text-link{display:inline-flex;align-items:center;gap:14px;min-height:44px;font-size:14px;color:var(--ink);border-bottom:1px solid var(--ink)}
.text-link:hover{color:var(--bronze);border-color:var(--bronze)}
.field-index{position:relative;z-index:2;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line)}
.field-index a{display:flex;align-items:baseline;gap:12px;padding:22px 0;min-height:44px;font-size:14px;color:var(--ink)}
.field-index a+a{padding-left:24px;border-left:1px solid var(--line)}
.field-index small{font-size:11px;letter-spacing:.1em;color:var(--bronze)}
.field-index b{font-weight:500}.field-index a:hover b{color:var(--bronze)}

/* hero visual: abstract data field */
.hero-visual{margin:0}
.hero-visual{position:absolute;z-index:1;right:max(0px,calc((100vw - var(--container))/2 - 60px));top:44px;width:min(700px,50vw);pointer-events:none}
.hero-visual img{width:100%;height:auto}

/* about */
.about{background:var(--ink);color:#d6dde0;padding:96px 0}
.about-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:80px;align-items:start}
.about .section-index{color:#d7c08c}
.about h2{margin:22px 0 0;font-size:clamp(30px,3.2vw,44px);line-height:1.38;letter-spacing:-.04em;font-weight:600;color:var(--paper)}
.about-copy p{margin:0 0 18px;font-size:16px;line-height:1.95}.about-copy p:last-child{margin:0}
.about-copy strong{color:var(--paper);font-weight:550}

/* sections */
.section{padding:104px 0}
.section-index{margin:0;font-size:11px;font-weight:700;letter-spacing:.16em;color:var(--bronze)}
.section-head{display:grid;grid-template-columns:1fr 2.1fr;gap:40px;margin-bottom:48px}
.section-head .section-index{padding-top:10px}
.section-head h2{margin:0;font-size:clamp(30px,3.1vw,44px);line-height:1.35;letter-spacing:-.045em;font-weight:600;color:var(--ink)}
.section-intro{margin:18px 0 0;font-size:16px;line-height:1.85;color:var(--muted);max-width:660px}
.field-row{display:grid;grid-template-columns:1fr 2.1fr;gap:40px;padding:38px 0 40px;border-top:1px solid var(--line)}
.field-row:last-child{border-bottom:1px solid var(--line)}
.field-no{display:block;font-size:12px;letter-spacing:.1em;color:var(--bronze)}
.field-en{display:block;margin-top:14px;font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.field-title h3{margin:8px 0 0;font-size:26px;letter-spacing:-.04em;line-height:1.4;color:var(--ink)}
.field-body .question{margin:0 0 14px;font-size:22px;line-height:1.5;letter-spacing:-.03em;font-weight:550;color:var(--ink)}
.field-body p{margin:0 0 10px;font-size:15px;line-height:1.9;color:var(--muted);max-width:740px}
.field-body .topics{margin-top:18px;font-size:13px;color:var(--bronze)}

/* method */
.method{background:var(--paper-deep);padding:104px 0}
.method-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:40px}
.method-list li{border-top:1px solid var(--ink);padding-top:22px}
.method-list span{font-size:11px;font-weight:700;letter-spacing:.16em;color:var(--bronze)}
.method-list h3{margin:18px 0 12px;font-size:21px;letter-spacing:-.035em;color:var(--ink)}
.method-list p{margin:0;font-size:15px;line-height:1.85;color:var(--muted)}

/* contact */
.contact{padding:104px 0 112px}
.contact h2{margin:0 0 28px}
.email{display:inline-block;font-size:clamp(26px,3.2vw,44px);letter-spacing:-.03em;color:var(--ink);border-bottom:1px solid var(--gold);padding-bottom:8px;word-break:normal}
.email:hover{color:var(--bronze)}
.contact-note{margin:24px 0 0;font-size:15px;line-height:1.85;color:var(--muted)}

/* footer */
.site-footer{border-top:1px solid var(--line);padding:30px 0}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;font-size:13px;color:var(--muted)}
.footer-inner strong{display:block;color:var(--ink);font-size:14px}.footer-inner span{display:block;font-size:11px;letter-spacing:.06em}
.footer-inner a{min-height:44px;display:inline-flex;align-items:center}

/* 404 */
.not-found{min-height:80vh;display:grid;align-content:center;gap:16px}.not-found h1{font-size:clamp(36px,6vw,66px);letter-spacing:-.04em;margin:0;color:var(--ink)}

@media(max-width:980px){
  .container{width:calc(100% - 56px)}
  .desktop-nav{gap:22px}
  .about-grid{gap:48px}
  .hero{display:flex;flex-direction:column}.hero-inner{order:1;padding-bottom:12px}.hero-visual{order:2;position:relative;top:auto;right:auto;width:min(640px,calc(100% - 56px));margin:0 max(28px,calc((100% - 640px)/2)) 8px auto}.field-index{order:3;margin-inline:auto}
  html[lang="en"] .hero-visual{width:min(640px,calc(100% - 56px))}
}
@media(max-width:760px){
  html{scroll-padding-top:72px}
  .container{width:calc(100% - 40px)}
  .header-inner{min-height:64px}
  .brand img{width:34px;height:34px}.brand-text strong{font-size:15px}.brand-text small{font-size:8px;letter-spacing:.08em}
  .desktop-nav{display:none}.mobile-menu{display:block}
  .hero-inner{padding:64px 0 56px}
  .eyebrow{font-size:10px;letter-spacing:.12em}
  .lead{font-size:15px}
  .hero{display:flex;flex-direction:column}.hero-inner{order:1;padding-bottom:8px}.hero-visual{order:2;position:relative;top:auto;right:auto;width:calc(100% - 40px);margin:0 auto 8px;opacity:.9}.field-index{order:3}
  .field-index{margin:0 auto;width:calc(100% - 40px);grid-template-columns:1fr 1fr}
  .field-index a{padding:16px 0}
  .field-index a:nth-child(odd){padding-left:0;border-left:0}
  .field-index a:nth-child(even){padding-left:16px;border-left:1px solid var(--line)}
  .field-index a:nth-child(n+3){border-top:1px solid var(--line)}
  .about,.method{padding:64px 0}.section,.contact{padding:64px 0}
  .about-grid,.section-head,.field-row{grid-template-columns:1fr;gap:20px}
  .section-head{margin-bottom:32px}.section-head .section-index{padding-top:0}
  .field-row{padding:28px 0 30px}.field-title h3{font-size:23px}.field-body .question{font-size:19px}.field-body p{font-size:14px}
  .method-list{grid-template-columns:1fr;gap:30px}
  .footer-inner{flex-wrap:wrap}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* language switch */
.header-end{display:flex;align-items:center;gap:34px}
.lang-switch{display:flex;align-items:center;font-size:12px;letter-spacing:.08em}
.lang-switch a{min-height:44px;min-width:36px;display:inline-flex;align-items:center;justify-content:center;color:var(--muted)}
.lang-switch a+a{border-left:1px solid var(--line)}
.lang-switch a[aria-current="page"]{color:var(--ink);font-weight:700}
.lang-switch a:hover{color:var(--bronze)}
/* English page type adjustments */
html[lang="en"] .hero h1{font-size:clamp(38px,4.6vw,62px);letter-spacing:-.035em;line-height:1.14}
html[lang="en"] .hero-inner>*{max-width:620px}
html[lang="en"] .hero-visual{width:min(600px,42vw)}
html[lang="en"] .about h2,html[lang="en"] .section-head h2{letter-spacing:-.03em}
html[lang="en"] .field-title h3,html[lang="en"] .field-body .question{letter-spacing:-.02em}
html[lang="en"] .desktop-nav{gap:28px}
@media(max-width:980px){.header-end{gap:20px}}
@media(max-width:760px){.header-end{gap:6px}.lang-switch{order:-1}.lang-switch a{min-width:30px;font-size:11px}.mobile-menu summary{white-space:nowrap}.brand{min-width:0}}
@media(max-width:760px){html[lang="en"] .hero-visual{width:calc(100% - 40px)}}

@media(min-width:981px) and (max-width:1180px){.hero-inner>*,html[lang="en"] .hero-inner>*{max-width:54vw}.hero h1{font-size:4.6vw}html[lang="en"] .hero h1{font-size:4.2vw}.hero-visual,html[lang="en"] .hero-visual{width:40vw}}
@media(max-width:374px){.brand-text small{display:none}.brand-text strong{font-size:14px}}