/* KACCGA — site.css : tokens, base, masthead, hero, signature (guilloche + microprint) */
:root{
  --navy:#232A8A;        /* seal navy, text-safe */
  --navy-deep:#131859;   /* bands, footer */
  --red:#D71F2B;         /* seal red (accent only) */
  --red-ink:#B8141F;     /* red for text on paper */
  --paper:#F4F6FB;       /* cool certificate paper */
  --white:#FFFFFF;
  --ink:#10142E;
  --muted:#565C7C;
  --mist:#E4E8F4;
  --line:#B3BBE4;        /* guilloche linework */
  --rule:#D5DAEC;
  --f-display:"Hahmlet","Noto Serif KR",Georgia,serif;
  --f-body:"Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --wrap:1200px;
  --gutter:clamp(18px,4vw,40px);
  --radius:10px;
  --shadow:0 1px 2px rgba(16,20,46,.06),0 8px 28px rgba(16,20,46,.07);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--f-body);font-size:17px;line-height:1.7;word-break:keep-all;overflow-wrap:break-word;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy);text-underline-offset:3px}
a:hover{color:var(--red-ink)}
:focus-visible{outline:3px solid var(--red);outline-offset:3px;border-radius:4px}
h1,h2,h3,h4{font-family:var(--f-display);color:var(--navy-deep);line-height:1.25;margin:0 0 .5em;letter-spacing:-.01em}
p{margin:0 0 1em}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;background:var(--navy);color:#fff;padding:8px 14px;z-index:100}
.skip:focus{left:8px;color:#fff}
html[lang="en"] .ko-only{display:none!important}
html[lang="ko"] .en-only{display:none!important}

/* ---------- utility type ---------- */
.eyebrow{font-family:var(--f-mono);font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);display:flex;align-items:center;gap:10px;margin:0 0 18px}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--red)}
.mono{font-family:var(--f-mono)}
.lead{font-size:clamp(17px,1.6vw,19px);color:var(--muted);max-width:40em}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border-radius:999px;font:600 16px/1 var(--f-body);text-decoration:none;border:1.5px solid transparent;cursor:pointer;transition:background .2s,color .2s,border-color .2s,transform .2s}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--navy);color:#fff}
.btn--primary:hover{background:var(--navy-deep);color:#fff}
.btn--ghost{border-color:var(--navy);color:var(--navy);background:transparent}
.btn--ghost:hover{background:var(--navy);color:#fff}
.btn--light{background:#fff;color:var(--navy-deep)}
.btn--light:hover{background:var(--mist);color:var(--navy-deep)}
.btn--line-light{border-color:rgba(255,255,255,.6);color:#fff}
.btn--line-light:hover{background:#fff;color:var(--navy-deep)}
.btn svg{width:18px;height:18px}

/* ---------- masthead ---------- */
.masthead{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);-webkit-backdrop-filter:saturate(1.4) blur(10px);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--rule)}
.masthead__row{display:flex;align-items:center;gap:20px;min-height:76px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);flex-shrink:0}
.brand img{width:50px;height:50px}
.brand__ko{display:block;font:800 19px/1.15 var(--f-body);letter-spacing:-.02em;color:var(--navy-deep)}
.brand__en{display:block;font:600 9.6px/1.3 var(--f-body);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:3px}
.nav{margin-left:auto;display:flex;align-items:center;gap:4px}
.nav a{position:relative;padding:10px 12px;font-weight:600;font-size:15.5px;color:var(--ink);text-decoration:none;border-radius:8px;white-space:nowrap}
.nav a:hover{color:var(--navy);background:var(--mist)}
.nav a[aria-current="page"]{color:var(--navy)}
.nav a[aria-current="page"]::after{content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;background:var(--red)}
.masthead__tools{display:flex;align-items:center;gap:10px}
.lang{display:inline-flex;border:1.5px solid var(--rule);border-radius:999px;padding:3px;background:#fff}
.lang button{border:0;background:transparent;font:700 13px/1 var(--f-mono);padding:8px 10px;border-radius:999px;color:var(--muted);cursor:pointer;min-width:40px}
.lang button[aria-pressed="true"]{background:var(--navy);color:#fff}
.masthead .btn{min-height:42px;padding:0 18px;font-size:15px}
.menu-btn{display:none;width:46px;height:46px;border:1.5px solid var(--rule);border-radius:12px;background:#fff;align-items:center;justify-content:center;cursor:pointer}
.menu-btn span,.menu-btn span::before,.menu-btn span::after{display:block;width:20px;height:2px;background:var(--navy-deep);position:relative;transition:transform .25s,background .25s}
.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0}
.menu-btn span::before{top:-6px}.menu-btn span::after{top:6px}
.menu-open .menu-btn span{background:transparent}
.menu-open .menu-btn span::before{transform:translateY(6px) rotate(45deg)}
.menu-open .menu-btn span::after{transform:translateY(-6px) rotate(-45deg)}

/* ---------- microprint (signature strip) ---------- */
.microprint{background:var(--mist);border-block:1px solid var(--rule);overflow:hidden;position:relative}
.microprint::before,.microprint::after{content:"";position:absolute;left:0;right:0;height:1px;background:var(--line)}
.microprint::before{top:3px}.microprint::after{bottom:3px}
.microprint__track{display:flex;width:max-content;font:500 10.5px/1 var(--f-mono);letter-spacing:.22em;color:var(--navy);text-transform:uppercase;padding:11px 0;white-space:nowrap}
.microprint__track span{padding-right:.9em}
html.motion .microprint__track{animation:micro 90s linear infinite}
@keyframes micro{to{transform:translateX(-50%)}}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;background:var(--white)}
.hero__grid{display:grid;grid-template-columns:1.08fr .92fr;gap:clamp(24px,4vw,64px);align-items:center;padding-block:clamp(48px,7vw,96px) clamp(40px,6vw,80px)}
.hero h1{font-size:clamp(38px,5.4vw,72px);font-weight:700;line-height:1.14;letter-spacing:-.025em;margin-bottom:24px}
.hero h1 em{font-style:normal;color:var(--red-ink)}
.hero .lead{margin-bottom:32px}
.hero__cta{display:flex;flex-wrap:wrap;gap:12px}
.hero__facts{display:flex;flex-wrap:wrap;gap:8px 28px;margin:36px 0 0;padding:18px 0 0;border-top:1px solid var(--rule);list-style:none;font-size:14.5px;color:var(--muted)}
.hero__facts b{font-family:var(--f-mono);font-weight:600;color:var(--navy-deep);margin-right:6px}

.medallion{position:relative;width:100%;max-width:520px;margin-inline:auto;aspect-ratio:1/1}
.medallion svg.guilloche{position:absolute;inset:0;width:100%;height:100%}
.guilloche path{fill:none;stroke:var(--line);stroke-width:.55;vector-effect:non-scaling-stroke}
.guilloche .g-outer{stroke:var(--navy);opacity:.28}
.guilloche .g-mid{stroke:var(--red);opacity:.28}
.guilloche .g-inner{stroke:var(--navy);opacity:.45}
.medallion__seal{position:absolute;left:50%;top:50%;width:44%;transform:translate(-50%,-50%);filter:drop-shadow(0 10px 24px rgba(19,24,89,.18))}
.medallion__year{position:absolute;left:50%;bottom:4%;transform:translateX(-50%);font:600 12px/1 var(--f-mono);letter-spacing:.3em;color:var(--navy);background:var(--white);padding:6px 10px;white-space:nowrap}
html.motion .guilloche path{stroke-dasharray:var(--len);stroke-dashoffset:var(--len);animation:draw 2.6s cubic-bezier(.6,.1,.2,1) forwards}
html.motion .guilloche .g-mid{animation-delay:.35s}
html.motion .guilloche .g-inner{animation-delay:.7s}
html.motion .medallion__seal{opacity:0;animation:sealIn .9s .9s ease-out forwards}
@keyframes draw{to{stroke-dashoffset:0}}
@keyframes sealIn{from{opacity:0;transform:translate(-50%,-46%) scale(.94)}to{opacity:1;transform:translate(-50%,-50%) scale(1)}}

/* ---------- reveal (gated) ---------- */
html.motion .reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
html.motion .reveal.in{opacity:1;transform:none}

/* ---------- page hero (subpages) ---------- */
.page-hero{background:var(--white);border-bottom:1px solid var(--rule);position:relative;overflow:hidden}
.page-hero .wrap{padding-block:clamp(44px,6vw,80px) clamp(36px,5vw,56px);position:relative}
.page-hero h1{font-size:clamp(34px,4.6vw,58px);font-weight:700;margin-bottom:14px}
.page-hero .lead{margin:0}
.page-hero__mark{position:absolute;right:-60px;top:50%;width:360px;height:360px;transform:translateY(-50%);opacity:.55;pointer-events:none}
.crumbs{font:500 13px/1 var(--f-mono);letter-spacing:.08em;color:var(--muted);margin-bottom:18px}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--navy)}

@media (max-width:1080px){
  .nav a{padding:10px 8px;font-size:15px}
  .masthead .btn--join{display:none}
}
@media (max-width:920px){
  .menu-btn{display:inline-flex}
  .nav{position:fixed;inset:76px 0 auto 0;flex-direction:column;align-items:stretch;gap:0;background:#fff;border-bottom:1px solid var(--rule);padding:8px var(--gutter) 20px;box-shadow:var(--shadow);transform:translateY(-8px);opacity:0;visibility:hidden;transition:opacity .2s,transform .2s,visibility .2s;max-height:calc(100vh - 76px);overflow:auto}
  .menu-open .nav{opacity:1;visibility:visible;transform:none}
  .nav a{padding:14px 4px;font-size:17px;border-bottom:1px solid var(--mist);border-radius:0}
  .nav a[aria-current="page"]::after{left:4px;right:auto;width:22px;bottom:8px}
  .masthead__tools{margin-left:auto}
  .hero__grid{grid-template-columns:1fr}
  .medallion{max-width:380px;order:-1}
  .page-hero__mark{opacity:.25;right:-120px}
}
@media (max-width:520px){
  body{font-size:16px}
  .masthead__row{min-height:64px;gap:10px}
  .nav{inset:64px 0 auto 0;max-height:calc(100vh - 64px)}
  .brand img{width:40px;height:40px}
  .brand__ko{font-size:16px}
  .brand__en{display:none}
  .lang button{min-width:34px;padding:7px 8px}
  .menu-btn{width:42px;height:42px}
  .hero__cta .btn{flex:1 1 100%}
  .medallion{max-width:300px}
}