:root{
  --paper:#FBFBFA; --silver:#ECEEF0; --line:#C3C8CD; --ink:#211B1D; --mute:#5E585A;
  --dawn:#9B2A24; --dawn-deep:#7A1F1A; --gold:#A8843A;
  --serif:"Gowun Batang",ui-serif,"AppleMyungjo","Batang",serif;
  --sans:"IBM Plex Sans KR","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.125rem/1.75 var(--sans);word-break:keep-all}
a{color:inherit}
a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
.wrap{max-width:68rem;margin:0 auto;padding:0 1.5rem}
header.top{border-bottom:1px solid var(--line);background:var(--paper)}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:4.5rem}
.brand{font:700 1.25rem/1.3 var(--serif);text-decoration:none}
.call{display:inline-flex;align-items:center;gap:.5rem;background:var(--dawn);color:#fff;text-decoration:none;font-weight:600;padding:.75rem 1.25rem;border-radius:.4rem;min-height:3rem}
.call:hover{background:var(--dawn-deep)}
.hero{padding:4.5rem 0 4rem;border-bottom:1px solid var(--line)}
.hero .wrap{display:grid;grid-template-columns:1fr auto;gap:3rem;align-items:center}
.hero h1{font:700 clamp(2.1rem,5vw,3.4rem)/1.3 var(--serif);margin:0 0 1.25rem;letter-spacing:-.01em}
.hero p{font-size:1.25rem;color:var(--mute);margin:0 0 2rem;max-width:32em}
.actions{display:flex;flex-wrap:wrap;gap:.75rem}
.ghost{display:inline-flex;align-items:center;min-height:3rem;padding:.75rem 1.25rem;border:1px solid var(--ink);border-radius:.4rem;text-decoration:none;font-weight:600}
.ghost:hover{background:var(--silver)}
.seal{display:flex;flex-direction:column;align-items:center;gap:.9rem;border:3px solid var(--dawn);border-radius:.3rem;padding:1.4rem 1.1rem 1.1rem;user-select:none}
.seal .han{writing-mode:vertical-rl;font:700 clamp(4rem,9vw,6.5rem)/1.05 "Noto Serif KR",var(--serif);color:var(--dawn)}
.seal .sub{font:500 1rem/1 var(--serif);color:var(--gold);letter-spacing:.2em}
section{padding:3.5rem 0;border-bottom:1px solid var(--line)}
section h2{font:700 1.75rem/1.4 var(--serif);margin:0 0 1.5rem}
.deal{display:flex;flex-wrap:wrap;gap:.5rem 2.5rem;list-style:none;padding:0;margin:0;font:600 1.375rem/1.6 var(--serif)}
.deal li{border-bottom:2px solid var(--gold);padding-bottom:.1rem}
.two{display:grid;grid-template-columns:1fr 1fr;gap:0;border-top:1px solid var(--ink)}
.two article{padding:1.75rem 1.5rem 1.75rem 0}
.two article+article{border-left:1px solid var(--line);padding-left:1.5rem}
.two h3{font:700 1.375rem/1.4 var(--serif);margin:0 0 .5rem}
.two p{margin:0;color:var(--mute)}
.benefit{background:var(--silver)}
.benefit .wrap{display:grid;grid-template-columns:1.2fr 1fr;gap:2rem;align-items:center}
.benefit p{margin:0 0 1rem;color:var(--mute)}
.info{display:grid;grid-template-columns:max-content 1fr;gap:.6rem 2rem;margin:0}
.info dt{color:var(--mute)}
.info dd{margin:0;font-weight:600}
footer{padding:2rem 0 3rem;color:var(--mute);font-size:.95rem}
.note{font-size:.95rem;color:var(--mute);border-left:3px solid var(--gold);padding:.25rem 0 .25rem 1rem;margin:1.5rem 0}
/* benefit page */
.formula{font:600 1.2rem/1.6 var(--serif);background:#fff;border:1px solid var(--line);padding:1rem 1.25rem;overflow-x:auto}
.figs{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:0 2rem}
.figs li{display:flex;justify-content:space-between;gap:1rem;border-bottom:1px solid var(--line);padding:.6rem 0}
.figs b{white-space:nowrap}
.sim{display:grid;gap:1rem;max-width:34rem}
.sim label{display:grid;gap:.35rem;font-weight:600}
.sim input{font:inherit;padding:.7rem .9rem;border:1px solid var(--ink);border-radius:.3rem;background:#fff;min-height:3rem}
.out{background:#fff;border:1px solid var(--ink);padding:1.25rem;margin-top:1.5rem;max-width:34rem}
.out .row{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding:.4rem 0}
.ok{color:#2F5D3A}.warn{color:var(--dawn)}
@media (max-width:760px){
  .hero .wrap,.benefit .wrap{grid-template-columns:1fr}
  .seal{flex-direction:row;justify-self:start;order:-1;padding:.6rem 1rem}
  .seal .han{writing-mode:horizontal-tb;font-size:3rem}
  .two{grid-template-columns:1fr}
  .two article+article{border-left:0;border-top:1px solid var(--line);padding-left:0}
  .figs{grid-template-columns:1fr}
  .brand{font-size:1.05rem}
}
@media (prefers-reduced-motion:no-preference){.seal{animation:stamp .6s ease-out both}@keyframes stamp{from{opacity:0;transform:scale(1.08)}to{opacity:1;transform:none}}}
@media (max-width:760px){.hide-sm{display:none}.call{padding:.7rem .9rem}}