/* ============================================================
   Essential — Shared Design System
   Used by sub-pages under /pages/. Home keeps its own inline CSS.
   ============================================================ */

:root{
  --bg:#FCFCFA;
  --bg-soft:#F4F2EC;
  --ink:#0F0F0E;
  --ink-2:#3A3A37;
  --muted:#8E8C85;
  --rule:#E6E3DA;
  --rule-strong:#CFCBBE;
  --sans:"Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--bg);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;font-feature-settings:"ss01","cv11"}
body{font-size:15px;line-height:1.55;text-wrap:pretty;letter-spacing:-0.005em;word-break:keep-all;overflow-wrap:break-word}
h1,h2,h3,h4,h5,h6,p,li,a,span,dd,dt,div{word-break:keep-all;overflow-wrap:break-word}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}

.wrap{max-width:1360px;margin:0 auto;padding:0 56px}
.hr{border:0;border-top:1px solid var(--rule)}
.hr-strong{border:0;border-top:1px solid var(--ink)}

/* ---- Type utilities ---- */
.tag{font-size:11px;letter-spacing:0.18em;text-transform:uppercase;color:var(--ink);font-weight:500}
.tag-muted{font-size:11px;letter-spacing:0.18em;text-transform:uppercase;color:var(--muted);font-weight:500}
.meta{font-family:var(--sans);font-size:11.5px;letter-spacing:0.04em;color:var(--muted)}
.slash{color:var(--muted);font-weight:400;margin:0 8px}

.pagenum{
  font-size:11px;letter-spacing:0.18em;color:var(--muted);font-weight:500;
  display:inline-flex;align-items:center;gap:10px;
}
.pagenum::before{content:"";display:inline-block;width:18px;height:1px;background:var(--rule-strong)}

/* ---- Utility strip ---- */
.util{
  border-bottom:1px solid var(--rule);
  font-size:11px;letter-spacing:0.16em;text-transform:uppercase;color:var(--muted);
}
.util-inner{display:flex;justify-content:space-between;align-items:center;height:34px}
.util span b{color:var(--ink);font-weight:600;letter-spacing:0.18em}
.pipe{color:var(--rule-strong);margin:0 12px}

/* ---- Global Nav ---- */
nav.top{position:sticky;top:0;z-index:50;background:var(--bg);border-bottom:1px solid var(--rule)}
.nav-inner{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;height:76px;gap:32px}
.logo{font-size:18px;font-weight:700;letter-spacing:-0.01em;display:inline-flex;align-items:center;gap:10px;color:var(--ink)}
.logo .mark{width:14px;height:14px;background:var(--ink);border-radius:50%}
.logo img{height:20px;width:auto;display:block}
.menu{display:flex;justify-content:center;gap:40px;font-size:14px;font-weight:500;color:var(--ink-2)}
.menu .item{position:relative;padding:28px 0;cursor:pointer}
.menu .item:hover{color:var(--ink)}
.menu .item.active{color:var(--ink)}
.menu .item.active::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;background:var(--ink);
}
.menu .item .submenu{
  position:absolute;top:100%;left:50%;transform:translate(-50%,4px);
  background:var(--bg);border:1px solid var(--rule);
  padding:8px 0;min-width:280px;opacity:0;visibility:hidden;transition:opacity .15s,transform .15s,visibility .15s;
}
.menu .item:hover .submenu{opacity:1;visibility:visible;transform:translate(-50%,0)}
.submenu a{display:grid;grid-template-columns:1fr auto;gap:16px;padding:12px 20px;font-size:13px;color:var(--ink-2);border-bottom:1px solid var(--rule)}
.submenu a:last-child{border-bottom:0}
.submenu a:hover{background:var(--bg-soft);color:var(--ink)}
.submenu a .ko{font-size:11px;color:var(--muted);align-self:center}

.nav-r{display:flex;justify-content:flex-end;align-items:center;gap:18px;font-size:13px}
.nav-r .lang{color:var(--muted);letter-spacing:0.08em}
.nav-r .lang b{color:var(--ink);font-weight:600}

.btn{
  display:inline-flex;align-items:center;gap:10px;height:40px;padding:0 18px;
  background:var(--ink);color:var(--bg);font-size:13px;font-weight:500;border:1px solid var(--ink);
  transition:background .15s,color .15s;cursor:pointer;
}
.btn:hover{background:transparent;color:var(--ink)}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:var(--bg)}
.btn .arr{display:inline-block;transition:transform .2s}
.btn:hover .arr{transform:translateX(4px)}

/* ---- Breadcrumb (sub-page header) ---- */
.crumbs{
  display:flex;align-items:center;gap:12px;font-size:11.5px;letter-spacing:0.14em;text-transform:uppercase;
  color:var(--muted);padding:32px 0 0;
}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--ink)}
.crumbs .sep{color:var(--rule-strong)}
.crumbs .cur{color:var(--ink);font-weight:600}

/* ---- Page hero (sub-page top section) ---- */
.page-hero{padding:40px 0 96px;border-bottom:1px solid var(--ink)}
.page-hero .grid{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:end;margin-top:48px}
.page-hero h1{
  font-size:clamp(48px,7vw,108px);line-height:0.98;letter-spacing:-0.035em;font-weight:600;
}
.page-hero h1 .lt{font-weight:300;color:var(--ink-2)}
.page-hero .h-ko{font-size:14px;color:var(--muted);margin-top:14px}
.page-hero .lede{font-size:16px;line-height:1.65;color:var(--ink-2);max-width:48ch}
.page-hero .lede .en{display:block;margin-top:14px;color:var(--muted);font-size:13.5px;line-height:1.55;font-style:italic;letter-spacing:0}
.page-hero .stats{
  display:flex;gap:48px;margin-top:48px;padding-top:24px;border-top:1px solid var(--rule);
}
.page-hero .stats div .n{font-size:32px;font-weight:600;letter-spacing:-0.02em;display:block;line-height:1}
.page-hero .stats div .lbl{font-size:11px;color:var(--muted);letter-spacing:0.14em;text-transform:uppercase;margin-top:8px;display:block}

/* ---- Section header (deck-head pattern) ---- */
section{padding:140px 0;border-top:1px solid var(--rule)}
.deck-head{display:grid;grid-template-columns:1fr 2fr;gap:80px;align-items:start;margin-bottom:88px}
.deck-head .pagenum{margin-bottom:24px}
.deck-head .title-en{font-size:clamp(36px,4.4vw,64px);line-height:1.0;letter-spacing:-0.03em;font-weight:600}
.deck-head .title-en .lt{font-weight:300;color:var(--ink-2)}
.deck-head .title-ko{font-size:14px;color:var(--muted);margin-top:14px}
.deck-head .right{padding-top:8px}
.deck-head .right p{font-size:16px;line-height:1.65;color:var(--ink-2);max-width:54ch}
.deck-head .right .en{margin-top:14px;color:var(--muted);font-size:13.5px;line-height:1.55;font-style:italic;letter-spacing:0}

/* ---- Footer ---- */
footer{padding:80px 0 32px;border-top:1px solid var(--ink)}
.foot-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr 1fr;gap:32px;margin-bottom:64px}
.foot-brand .logo{margin-bottom:18px}
.foot-brand p{font-size:13px;color:var(--ink-2);line-height:1.6;max-width:38ch}
.foot-brand .en{font-size:12px;color:var(--muted);margin-top:8px;font-style:italic;letter-spacing:0}
footer h6{font-size:11px;letter-spacing:0.16em;text-transform:uppercase;color:var(--ink);margin-bottom:18px;font-weight:600}
footer ul{list-style:none;display:flex;flex-direction:column;gap:8px}
footer ul a{font-size:13px;color:var(--ink-2)}
footer ul a:hover{color:var(--ink)}
.foot-bottom{
  border-top:1px solid var(--rule);padding-top:20px;display:flex;justify-content:space-between;
  font-size:11px;letter-spacing:0.06em;color:var(--muted);
}
.foot-bottom .ver{font-family:var(--mono);letter-spacing:0.08em}

@media (max-width: 980px){
  .wrap{padding:0 24px}
  .menu{display:none}
  .menu-toggle{display:inline-flex}
  .nav-inner{grid-template-columns:1fr auto;height:64px}
  .nav-r{gap:14px}
  .nav-r .lang{display:none}
  .nav-r .btn:not(.menu-toggle){display:none}
  .page-hero .grid,.deck-head,.foot-top{grid-template-columns:1fr;gap:32px}
}

@media (max-width: 640px){
  body{font-size:14px}
  .wrap{padding:0 20px}
  .util{font-size:10px;letter-spacing:0.12em}
  .util-inner{height:auto;min-height:34px;padding:8px 0;gap:12px;flex-wrap:wrap}
  .util .pipe{margin:0 8px}
  nav.top .nav-inner{height:56px;gap:12px}
  .logo{font-size:16px}
  .logo .mark{width:12px;height:12px}
  .foot-bottom{flex-direction:column;gap:8px;align-items:flex-start}
}

/* Mobile menu toggle + panel */
.menu-toggle{
  display:none;align-items:center;gap:10px;background:none;border:0;cursor:pointer;
  font-family:var(--sans);font-size:12px;font-weight:600;letter-spacing:0.16em;
  text-transform:uppercase;color:var(--ink);padding:8px 0;
}
.menu-toggle .bars{display:inline-flex;flex-direction:column;gap:4px}
.menu-toggle .bars i{display:block;width:18px;height:1.5px;background:var(--ink);transition:transform .2s,opacity .2s}
body.menu-open .menu-toggle .bars i:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
body.menu-open .menu-toggle .bars i:nth-child(2){opacity:0}
body.menu-open .menu-toggle .bars i:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

.mobile-panel{
  position:fixed;inset:0;background:var(--bg);z-index:60;
  display:flex;flex-direction:column;
  opacity:0;visibility:hidden;transition:opacity .2s,visibility .2s;
  overflow-y:auto;
}
body.menu-open .mobile-panel{opacity:1;visibility:visible}
.mp-head{
  display:flex;justify-content:space-between;align-items:center;
  height:56px;padding:0 20px;border-bottom:1px solid var(--rule);
  position:sticky;top:0;background:var(--bg);z-index:1;
}
.mp-body{padding:24px 20px 16px;flex:1}
.mp-section{border-bottom:1px solid var(--rule);padding:18px 0}
.mp-section:last-of-type{border-bottom:0}
.mp-section > .lbl{
  display:flex;align-items:baseline;justify-content:space-between;
  width:100%;background:none;border:0;padding:6px 0;cursor:pointer;
  font-family:var(--sans);font-size:22px;font-weight:600;letter-spacing:-0.015em;
  color:var(--ink);text-align:left;
}
.mp-section > .lbl .num{font-size:10.5px;letter-spacing:0.18em;color:var(--muted);font-weight:500}
.mp-section > .lbl .ko{font-size:12px;font-weight:400;color:var(--muted);letter-spacing:0;margin-left:10px}
.mp-section > .lbl .chev{font-family:var(--mono);font-size:14px;color:var(--muted);transition:transform .2s}
.mp-section.open > .lbl .chev{transform:rotate(45deg);color:var(--ink)}
.mp-sub{display:grid;grid-template-rows:0fr;transition:grid-template-rows .25s ease}
.mp-sub > div{overflow:hidden}
.mp-section.open .mp-sub{grid-template-rows:1fr}
.mp-sub a{
  display:flex;justify-content:space-between;align-items:baseline;gap:16px;
  padding:12px 0;border-top:1px solid var(--rule);
  font-size:14px;color:var(--ink-2);
}
.mp-sub > div > :first-child{margin-top:12px}
.mp-sub a:hover{color:var(--ink)}
.mp-sub a .ko{font-size:11px;color:var(--muted);letter-spacing:0}
.mp-foot{
  padding:20px;border-top:1px solid var(--rule);display:flex;flex-direction:column;gap:14px;
  background:var(--bg);position:sticky;bottom:0;
}
.mp-foot .lang{
  display:flex;justify-content:space-between;font-size:11px;letter-spacing:0.16em;
  text-transform:uppercase;color:var(--muted);
}
.mp-foot .lang .opts b{color:var(--ink);font-weight:600}
.mp-foot .btn{width:100%;justify-content:center;height:48px}

/* ---- Back-to-top floating button ---- */
.to-top{
  position:fixed;right:28px;bottom:28px;z-index:55;
  width:50px;height:50px;display:flex;align-items:center;justify-content:center;
  background:var(--ink);color:var(--bg);border:1px solid var(--ink);cursor:pointer;
  font-family:var(--sans);font-size:15px;line-height:1;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .2s,transform .2s,visibility .2s,background .15s,color .15s;
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:transparent;color:var(--ink)}
@media (max-width:640px){
  .to-top{right:16px;bottom:16px;width:44px;height:44px}
}

/* 위쪽 `.menu-toggle{display:none}` base 규칙이 980px 미디어쿼리보다
   뒤에 정의돼 모바일에서 햄버거 메뉴가 가려지는 문제 — 마지막에 다시 노출 */
@media (max-width: 980px){
  .menu-toggle{display:inline-flex}
}