:root{
  --bg:#fbfaf8; --surface:#ffffff; --text:#1a1a1a; --muted:#6b6b6b;
  --line:#e7e4de; --line-soft:#f0eee9;
  --teach:#0e8a7d; --design:#2563c9; --build:#c07b12; --write:#c04a6e;
  --serif:'Nanum Myeongjo', serif;
  --sans:'Pretendard', -apple-system, system-ui, sans-serif;
  --max:1080px;
}
[data-theme="dark"]{
  --bg:#100f0e; --surface:#191817; --text:#f2efe9; --muted:#a29d95;
  --line:#2c2a27; --line-soft:#232120;
  --teach:#2fd0bd; --design:#6ba2ff; --build:#e6ad4f; --write:#f2879f;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--sans);
  line-height:1.65;-webkit-font-smoothing:antialiased;transition:background .3s,color .3s}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.muted{color:var(--muted)}

/* NAV */
header.nav{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 85%,transparent);
  backdrop-filter:blur(12px);border-bottom:1px solid var(--line-soft)}
.nav-inner{max-width:var(--max);margin:0 auto;padding:16px 24px;display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:800;font-size:16px;letter-spacing:-.02em}
.brand span{color:var(--muted);font-weight:500}
.nav-links{display:flex;gap:24px;align-items:center;font-size:14.5px;font-weight:500}
.nav-links a{color:var(--muted);transition:color .2s}
.nav-links a:hover{color:var(--text)}
.theme-btn{background:none;border:1px solid var(--line);border-radius:100px;
  width:34px;height:34px;cursor:pointer;color:var(--text);font-size:15px;display:grid;place-items:center;transition:.2s}
.theme-btn:hover{border-color:var(--muted)}
@media(max-width:760px){.nav-links a:not(.pill){display:none}}

/* HERO */
.hero{padding:96px 0 72px}
.eyebrow{font-size:13px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);font-weight:600;margin-bottom:26px}
.hero h1{font-family:var(--serif);font-weight:800;font-size:clamp(42px,7vw,78px);
  line-height:1.1;letter-spacing:-.02em;margin-bottom:28px}
.hero .lead{font-size:clamp(17px,2.2vw,20px);color:var(--muted);max-width:560px;margin-bottom:14px}
.hero .sub{font-size:15px;color:var(--muted);margin-bottom:36px}
.cta{display:inline-flex;align-items:center;gap:8px;background:var(--text);color:var(--bg);
  padding:13px 24px;border-radius:100px;font-weight:600;font-size:15px;transition:.2s}
.cta:hover{opacity:.85;transform:translateY(-1px)}
.cta.ghost{background:transparent;color:var(--text);border:1px solid var(--line);margin-left:10px}

/* SECTIONS */
section{padding:64px 0}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:32px;gap:16px}
.sec-head h2{font-size:14px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:700}
.sec-head a{font-size:14px;color:var(--muted);font-weight:500}
.sec-head a:hover{color:var(--text)}

/* PILLARS */
.pillars{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
@media(max-width:860px){.pillars{grid-template-columns:repeat(2,1fr)}}
@media(max-width:460px){.pillars{grid-template-columns:1fr}}
.pillar{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:26px 22px 24px;
  transition:.25s;position:relative;overflow:hidden;display:block}
.pillar:hover{transform:translateY(-4px);border-color:var(--pc);box-shadow:0 12px 30px -18px var(--pc)}
.pillar .num{font-family:var(--serif);font-size:14px;color:var(--pc);font-weight:700;opacity:.8}
.pillar h3{font-size:22px;margin:14px 0 8px;letter-spacing:-.01em}
.pillar p{font-size:14px;color:var(--muted);line-height:1.55}
.pillar .bar{position:absolute;left:0;top:0;height:100%;width:4px;background:var(--pc)}
.p1{--pc:var(--teach)} .p2{--pc:var(--design)} .p3{--pc:var(--build)} .p4{--pc:var(--write)}

/* FEATURED */
.featured{background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:clamp(30px,5vw,56px);display:block}
.featured .tag{font-size:12.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--write);font-weight:700}
.featured h3{font-family:var(--serif);font-weight:800;font-size:clamp(26px,4vw,40px);line-height:1.22;margin:16px 0 20px;letter-spacing:-.01em}
.featured p{font-size:16.5px;color:var(--muted);max-width:640px;margin-bottom:26px}
.read{display:inline-flex;gap:7px;font-weight:600;font-size:15px;color:var(--text);border-bottom:1.5px solid var(--text);padding-bottom:3px}

/* LIST / ITEMS */
.latest-list{display:grid;gap:2px}
.item{display:grid;grid-template-columns:auto 1fr auto;gap:18px;align-items:center;
  padding:20px 6px;border-top:1px solid var(--line-soft);transition:.2s}
.item:hover{background:var(--surface);padding-left:16px;padding-right:16px;border-radius:12px}
.item .k{font-size:12px;font-weight:700;letter-spacing:.05em;padding:4px 10px;border-radius:100px;white-space:nowrap}
.k.teach{color:var(--teach);background:color-mix(in srgb,var(--teach) 14%,transparent)}
.k.design{color:var(--design);background:color-mix(in srgb,var(--design) 14%,transparent)}
.k.build{color:var(--build);background:color-mix(in srgb,var(--build) 14%,transparent)}
.k.write{color:var(--write);background:color-mix(in srgb,var(--write) 14%,transparent)}
.item h4{font-size:17px;font-weight:600;letter-spacing:-.01em}
.item .date{font-size:13.5px;color:var(--muted);white-space:nowrap}
@media(max-width:560px){.item{grid-template-columns:auto 1fr}.item .date{display:none}}

/* PAGE HEADER (내부 페이지) */
.page-head{padding:80px 0 8px}
.page-head .num{font-family:var(--serif);font-size:16px;font-weight:700}
.page-head h1{font-family:var(--serif);font-size:clamp(34px,6vw,56px);font-weight:800;letter-spacing:-.02em;margin:10px 0 12px}
.page-head p{color:var(--muted);font-size:17px;max-width:560px}

/* PROSE (글 본문) */
.prose{max-width:720px;margin:0 auto;padding:72px 0}
.prose .k{display:inline-block;font-size:12px;font-weight:700;padding:4px 10px;border-radius:100px;margin-bottom:16px}
.prose h1{font-family:var(--serif);font-size:clamp(30px,5vw,46px);font-weight:800;line-height:1.2;letter-spacing:-.02em;margin-bottom:12px}
.prose time{display:block;color:var(--muted);font-size:14px;margin-bottom:40px}
.prose h2{font-size:24px;margin:40px 0 14px;letter-spacing:-.01em}
.prose h3{font-size:19px;margin:30px 0 10px}
.prose p{font-size:17px;line-height:1.8;margin:18px 0;color:var(--text)}
.prose a{color:var(--design);text-decoration:underline;text-underline-offset:3px}
.prose ul,.prose ol{margin:18px 0 18px 22px}
.prose li{margin:8px 0;line-height:1.7}
.prose blockquote{border-left:3px solid var(--line);padding-left:18px;color:var(--muted);font-style:italic;margin:24px 0}
.prose code{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:2px 6px;font-size:.9em}
.prose pre{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px;overflow:auto;margin:24px 0}
.prose pre code{border:none;padding:0;background:none}
.prose img{max-width:100%;border-radius:12px;margin:24px 0}

/* DOWNLOAD (자료실) */
.dl{color:var(--muted);font-size:13.5px;font-weight:600;white-space:nowrap}
.dl:hover{color:var(--text)}

/* ABOUT */
.about{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:start}
@media(max-width:760px){.about{grid-template-columns:1fr;gap:28px}}
.about h2{font-family:var(--serif);font-size:32px;font-weight:800;margin-bottom:6px}
.about .en{font-size:13px;letter-spacing:.2em;color:var(--muted);text-transform:uppercase;margin-bottom:22px}
.about p{color:var(--muted);font-size:16px;line-height:1.75;margin-bottom:16px}
.stats{display:grid;gap:22px}
.stat{border-left:2px solid var(--line);padding-left:16px}
.stat b{font-family:var(--serif);font-size:30px;font-weight:800;display:block;line-height:1}
.stat span{font-size:13.5px;color:var(--muted)}

/* Q&A placeholder */
.notice{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:clamp(28px,5vw,48px);text-align:center}
.notice .badge{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--write);
  background:color-mix(in srgb,var(--write) 14%,transparent);padding:5px 12px;border-radius:100px;margin-bottom:18px}
.notice h2{font-size:24px;margin-bottom:12px}
.notice p{color:var(--muted);max-width:520px;margin:0 auto 8px}

/* FOOTER */
footer{border-top:1px solid var(--line);padding:44px 0 60px;margin-top:40px}
.foot{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;max-width:var(--max);margin:0 auto;padding:0 24px}
.foot .links{display:flex;gap:22px;font-size:14.5px;font-weight:500}
.foot .links a{color:var(--muted)}.foot .links a:hover{color:var(--text)}
.foot .cr{font-size:13.5px;color:var(--muted)}