:root{
    --paper:#F6F8FB;
    --sheet:#FFFFFF;
    --ink:#1C2A6B;
    --ink-soft:#33438F;
    --ink-wash:#E9EDF8;
    --text:#1A1C23;
    --pencil:#5F6675;
    --rule:#D9DEE8;
    --grid:#E7EBF2;
    --marker:#FFE45C;
  }
  *{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(--text);
    font-family:"Schibsted Grotesk",system-ui,-apple-system,"Apple SD Gothic Neo","Malgun Gothic",sans-serif;
    font-size:17px;line-height:1.6;
  }
  a{color:var(--ink)}
  a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--ink);outline-offset:3px;border-radius:4px}
  .wrap{max-width:1120px;margin:0 auto;padding:0 24px}
  .ko{color:var(--pencil)}

  /* nav */
  .nav{position:sticky;top:0;z-index:10;background:rgba(246,248,251,.92);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid transparent}
  .nav.scrolled{border-bottom-color:var(--rule)}
  .nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
  .brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;letter-spacing:-.01em;color:var(--text);text-decoration:none}
  .brand svg{flex:none}
  .nav ul{display:none;list-style:none;margin:0;padding:0;gap:28px}
  .nav ul a{color:var(--pencil);text-decoration:none;font-size:15px;font-weight:500}
  .nav ul a:hover{color:var(--text)}
  .btn{display:inline-block;background:var(--ink);color:#fff;text-decoration:none;font-weight:700;padding:12px 20px;border-radius:8px;font-size:15px;white-space:nowrap}
  .btn:hover{background:var(--ink-soft)}
  .btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
  .btn.ghost:hover{background:var(--ink-wash)}
  .btn.lg{padding:15px 24px;font-size:16px}

  /* hero */
  .hero{padding:56px 0 40px}
  .hero h1{font-size:clamp(42px,7vw,84px);line-height:1;letter-spacing:-.04em;font-weight:800;margin:0;max-width:12ch}
  .hero .lede{font-size:clamp(18px,2.1vw,21px);line-height:1.5;color:var(--pencil);max-width:44ch;margin:24px 0 0}
  .hero .lede-ko{font-size:15.5px;margin:10px 0 0;max-width:52ch}
  .hero .ctas{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
  .hero .note{font-size:14px;color:var(--pencil);margin-top:14px}

  /* demo */
  .demo{margin:40px 0 0;display:grid;grid-template-columns:1fr;gap:22px;align-items:center}
  .memo{
    position:relative;background:var(--sheet);
    background-image:linear-gradient(var(--grid) 1px,transparent 1px);
    background-size:100% 34px;background-position:0 46px;
    border:1px solid var(--rule);border-radius:6px;padding:16px 24px 26px;
    font-family:"Nanum Pen Script",cursive;font-size:25px;line-height:34px;color:#39404f;
    transform:rotate(-1.2deg);
  }
  .memo .src{font-family:"Schibsted Grotesk",sans-serif;font-size:13px;line-height:1.4;color:var(--pencil);margin:0 0 12px;display:flex;align-items:center;gap:8px}
  .rec{display:inline-flex;align-items:center;gap:6px;background:var(--ink-wash);color:var(--ink);border-radius:999px;padding:3px 10px;font-weight:600}
  .rec i{width:7px;height:7px;border-radius:50%;background:#D7263D;display:inline-block}
  .memo s{color:#9aa1ad}
  .arrow{display:none;color:var(--ink);justify-self:center}
  .page{
    background:var(--sheet);border:1px solid var(--rule);border-radius:12px;
    padding:26px 28px;box-shadow:0 1px 0 var(--rule),0 24px 48px -30px rgba(28,42,107,.5);
  }
  .page .head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}
  .page h2{font-size:21px;letter-spacing:-.02em;line-height:1.3;margin:0 0 4px}
  .page .meta{font-size:13.5px;color:var(--pencil);margin:0 0 6px}
  .badge{flex:none;font-size:12.5px;font-weight:600;color:var(--ink);background:var(--ink-wash);border-radius:999px;padding:3px 10px}
  .page h3{font-size:13.5px;font-weight:700;color:var(--ink);margin:16px 0 5px}
  .page p,.page li{font-size:15px;line-height:1.55;margin:0}
  .page ul{margin:0;padding-left:20px}
  .page li+li{margin-top:4px}
  .ts{font-size:12.5px;font-weight:600;color:var(--ink);background:var(--ink-wash);border-radius:4px;padding:1px 6px;margin-left:4px;white-space:nowrap}
  mark{background:linear-gradient(transparent 45%,var(--marker) 45%);color:inherit;padding:0 2px}
  .check{list-style:none;padding-left:0!important}
  .check li::before{content:"";display:inline-block;width:12px;height:12px;border:1.5px solid var(--ink-soft);border-radius:3px;margin-right:9px;vertical-align:-1px}
  .quiz{border:1px dashed var(--rule);border-radius:8px;padding:10px 12px}

  /* points */
  .points{display:grid;grid-template-columns:1fr;gap:22px;padding:56px 0 8px}
  .points div{display:flex;gap:14px;align-items:flex-start}
  .points svg{flex:none;margin-top:3px;color:var(--ink)}
  .points strong{display:block;font-size:17px}
  .points span{color:var(--pencil);font-size:15.5px}

  /* sections */
  section.block{padding:88px 0;border-top:1px solid var(--rule);margin-top:56px}
  section.block + section.block{margin-top:0}
  .sec{font-size:clamp(30px,3.8vw,44px);letter-spacing:-.03em;line-height:1.1;margin:0;max-width:20ch}
  .sec-sub{color:var(--pencil);font-size:18px;max-width:52ch;margin:16px 0 40px}

  ol.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr;gap:32px;counter-reset:s}
  ol.steps li{counter-increment:s;padding-top:20px;border-top:2px solid var(--ink);max-width:40ch}
  ol.steps li::before{content:counter(s);display:block;font-weight:800;font-size:15px;color:var(--ink);margin-bottom:10px}
  ol.steps strong{display:block;font-size:21px;letter-spacing:-.01em;margin-bottom:6px}
  ol.steps span{color:var(--pencil)}

  .outputs{display:grid;grid-template-columns:1fr;gap:1px;background:var(--rule);border:1px solid var(--rule);border-radius:12px;overflow:hidden}
  .outputs div{background:var(--sheet);padding:26px 26px 28px}
  .outputs h3{font-size:18px;margin:0 0 8px;letter-spacing:-.01em}
  .outputs p{margin:0;color:var(--pencil);font-size:15.5px}
  .outputs .sample{margin-top:14px;font-size:14px;color:var(--text);background:var(--paper);border-radius:6px;padding:10px 12px}

  .who{display:grid;grid-template-columns:1fr;gap:20px}
  .who article{background:var(--sheet);border:1px solid var(--rule);border-radius:12px;padding:28px}
  .who h3{font-size:22px;letter-spacing:-.02em;margin:0 0 4px}
  .who .ko{font-size:15px;margin:0 0 16px}
  .who ul{margin:0;padding-left:20px;color:var(--text)}
  .who li+li{margin-top:6px}

  .faq{max-width:760px}
  .faq details{border-bottom:1px solid var(--rule)}
  .faq summary{cursor:pointer;list-style:none;padding:20px 32px 20px 0;font-weight:600;font-size:18px;position:relative}
  .faq summary::-webkit-details-marker{display:none}
  .faq summary::after{content:"";position:absolute;right:6px;top:28px;width:10px;height:10px;border-right:2px solid var(--ink);border-bottom:2px solid var(--ink);transform:rotate(45deg);transition:transform .2s}
  .faq details[open] summary::after{transform:rotate(-135deg);top:32px}
  .faq details p{margin:0 0 22px;color:var(--pencil);max-width:62ch}

  .closing{background:var(--ink);color:#fff;border-radius:16px;padding:56px 32px;margin:88px 0 0}
  .closing h2{font-size:clamp(30px,4vw,46px);letter-spacing:-.03em;line-height:1.1;margin:0;max-width:18ch}
  .closing p{color:#C9D0EC;max-width:52ch;margin:16px 0 28px}
  .closing .btn{background:#fff;color:var(--ink)}
  .closing .btn:hover{background:var(--marker)}

  footer.wrap{padding:72px 24px 56px;color:var(--pencil);font-size:14px}
  footer .row{display:flex;flex-wrap:wrap;gap:12px 32px;justify-content:space-between;align-items:flex-start}
  footer .brand{font-size:16px}
  footer p{margin:8px 0 0;max-width:40ch}
  footer nav{display:flex;gap:24px;flex-wrap:wrap}
  footer nav a{color:var(--pencil);text-decoration:none}
  footer nav a:hover{color:var(--text)}
  footer .legal{margin-top:32px;padding-top:20px;border-top:1px solid var(--rule)}

  @media (min-width:860px){
    .nav ul{display:flex}
    .hero{padding-top:88px}
    .demo{grid-template-columns:0.82fr 56px 1.18fr}
    .arrow{display:block}
    .points{grid-template-columns:repeat(3,1fr)}
    ol.steps{grid-template-columns:repeat(3,1fr)}
    .outputs{grid-template-columns:repeat(2,1fr)}
    .who{grid-template-columns:repeat(2,1fr)}
    .closing{padding:72px 64px}
  }
  @media (prefers-reduced-motion:no-preference){
    .page{animation:settle .9s .3s cubic-bezier(.2,.7,.2,1) both}
    .page mark{background-size:0 100%;background-repeat:no-repeat;background-image:linear-gradient(transparent 45%,var(--marker) 45%);background-color:transparent;animation:swipe .6s 1.2s ease-out forwards}
    @keyframes settle{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
    @keyframes swipe{to{background-size:100% 100%}}
  }

  /* shared additions */
  .nav .right{display:flex;align-items:center;gap:14px}
  .lang{font-size:14px;font-weight:600;color:var(--pencil);text-decoration:none;padding:6px 8px;border-radius:6px}
  .lang:hover{color:var(--text);background:var(--ink-wash)}
  .example-link{display:inline-block;margin-top:18px;font-weight:600;font-size:15px}

  /* document pages */
  .doc{max-width:760px;padding:56px 0 24px}
  .doc .eyebrow{font-size:14px;color:var(--pencil);margin:0 0 12px}
  .doc h1{font-size:clamp(32px,4.6vw,48px);letter-spacing:-.03em;line-height:1.1;margin:0 0 16px}
  .doc .lead{font-size:18px;color:var(--pencil);margin:0 0 32px;max-width:60ch}
  .doc h2{font-size:22px;letter-spacing:-.015em;margin:40px 0 10px}
  .doc p,.doc li{max-width:68ch}
  .doc ul{padding-left:22px}
  .doc li+li{margin-top:6px}
  .notice{background:var(--ink-wash);border-radius:10px;padding:14px 18px;font-size:15px;color:var(--ink);margin:0 0 32px}

  /* sample note page */
  .sample{background:var(--sheet);border:1px solid var(--rule);border-radius:14px;padding:32px clamp(20px,4vw,44px);box-shadow:0 24px 48px -36px rgba(28,42,107,.45)}
  .sample .meta-row{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 24px}
  .chip{font-size:13px;font-weight:600;color:var(--ink);background:var(--ink-wash);border-radius:999px;padding:4px 12px}
  .sample h2{font-size:15px;font-weight:700;color:var(--ink);margin:28px 0 8px;letter-spacing:0}
  .sample h2:first-of-type{margin-top:0}
  .terms dt{font-weight:700;margin-top:10px}
  .terms dd{margin:2px 0 0;color:var(--text)}
  .qa li{margin-bottom:10px}
  .qa details summary{cursor:pointer;color:var(--ink);font-size:14px;font-weight:600;margin-top:4px}
  .qa details p{margin:6px 0 0;color:var(--pencil)}
  .split{display:grid;grid-template-columns:1fr;gap:20px;margin:0 0 32px}
  @media (min-width:860px){.split{grid-template-columns:1fr 1fr}}
  .split .memo{transform:none}
  :lang(ko){word-break:keep-all;overflow-wrap:break-word}