:root{
  --ink:#0b1220;--body:#3d4657;--mut:#8a93a5;--line:#e8ebf1;
  --blue:#2457e6;--blue-d:#1a3fae;--bg:#fff;--soft:#f5f7fb;
  --r:16px;--shadow:0 4px 24px rgba(15,23,42,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Pretendard Variable",Pretendard,-apple-system,"Apple SD Gothic Neo","Noto Sans KR",sans-serif;color:var(--body);background:var(--bg);line-height:1.75;font-size:16px;letter-spacing:-.01em}
a{color:inherit;text-decoration:none}
h1,h2,h3{color:var(--ink);letter-spacing:-.02em;line-height:1.35}
img{max-width:100%}

/* header */
.hd{position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);z-index:50}
.hd-in{max-width:1120px;margin:0 auto;display:flex;align-items:center;gap:32px;padding:0 24px;height:64px}
.logo{font-weight:900;font-size:1.25rem;color:var(--ink);letter-spacing:-.02em}
.logo span{color:var(--blue)}
.gnb{display:flex;gap:24px;font-weight:600;font-size:.95rem;color:var(--body);margin-left:auto}
.gnb a:hover{color:var(--blue)}
.hd-cta{background:var(--blue);color:#fff;font-weight:700;font-size:.9rem;padding:10px 18px;border-radius:999px}
.hd-cta:hover{background:var(--blue-d)}

/* hero featured */
.hero-wrap{max-width:1120px;margin:40px auto 0;padding:0 24px}
.featured{display:grid;grid-template-columns:1.1fr 1fr;gap:0;border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:var(--shadow);transition:transform .2s}
.featured:hover{transform:translateY(-2px)}
.featured-thumb{position:relative;min-height:320px;display:flex;flex-direction:column;justify-content:flex-end;padding:32px;color:#fff}
.thumb-cat{font-size:.8rem;font-weight:700;opacity:.85;margin-bottom:8px}
.thumb-title{font-size:1.5rem;font-weight:800;line-height:1.4;text-shadow:0 2px 12px rgba(0,0,0,.25)}
.featured-body{padding:40px;display:flex;flex-direction:column;justify-content:center;gap:12px}
.featured-body h1{font-size:1.5rem;margin:0}
.featured-body p{margin:0;color:var(--body)}

/* pills */
.list-wrap{max-width:1120px;margin:48px auto;padding:0 24px}
.cat-pills{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:32px}
.cat-pills a{padding:9px 18px;border:1px solid var(--line);border-radius:999px;font-weight:600;font-size:.92rem;color:var(--body);background:#fff}
.cat-pills a:hover{border-color:var(--blue);color:var(--blue)}
.cat-pills a.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.cat-title{font-size:1.6rem;margin:0 0 24px}
.empty{color:var(--mut);padding:40px 0}

/* cards */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff;box-shadow:var(--shadow);transition:transform .2s}
.card:hover{transform:translateY(-3px)}
.card-thumb{height:150px;display:flex;align-items:flex-end;padding:16px;color:#fff}
.card-thumb.sm{height:90px}
.card-thumb span{font-size:.8rem;font-weight:700;opacity:.9}
.card-body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-body h2,.card-body h3{font-size:1.05rem;margin:0}
.card-body p{margin:0;font-size:.9rem;color:var(--body);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.meta{color:var(--mut);font-size:.82rem}
.badge{display:inline-block;background:#eaf0ff;color:var(--blue);font-weight:700;font-size:.78rem;padding:4px 12px;border-radius:999px;width:fit-content}

/* tool banner */
.tool-banner{max-width:1120px;margin:16px auto 64px;padding:36px 40px;display:flex;align-items:center;justify-content:space-between;gap:24px;background:linear-gradient(120deg,#0b1220,#1a2c56);border-radius:24px;color:#cbd5e1}
.tool-banner h2{color:#fff;margin:0 0 6px;font-size:1.3rem}
.tool-banner p{margin:0;font-size:.95rem}
.btn{display:inline-block;background:var(--blue);color:#fff;padding:13px 26px;border-radius:12px;font-weight:700;border:0;font-size:1rem;cursor:pointer;white-space:nowrap}
.btn:hover{background:var(--blue-d)}

/* post */
.post{max-width:760px;margin:48px auto;padding:0 24px}
.crumb{font-size:.85rem;color:var(--mut);margin-bottom:16px}
.crumb a:hover{color:var(--blue)}
.post h1{font-size:1.9rem;margin:12px 0 8px}
.post-hero{height:180px;border-radius:var(--r);display:flex;align-items:flex-end;padding:20px;color:#fff;margin:24px 0 8px}
.post-hero span{font-weight:700;opacity:.9}
.prose h2{font-size:1.35rem;margin-top:2.2em;padding-top:.6em;border-top:1px solid var(--line)}
.prose h3{font-size:1.1rem}
.prose table{border-collapse:collapse;width:100%;font-size:.92rem;margin:1em 0}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.prose th{background:var(--soft);color:var(--ink)}
.prose blockquote{margin:1.5em 0;padding:14px 20px;background:var(--soft);border-left:4px solid var(--blue);border-radius:0 10px 10px 0;color:var(--body);font-size:.92rem}
.prose a{color:var(--blue);font-weight:600}
.prose strong{color:var(--ink)}
.cta-box{background:linear-gradient(120deg,#eaf0ff,#f2f7ff);border:1px solid #d4e0ff;border-radius:20px;padding:28px;margin:40px 0;text-align:center}
.cta-box strong{color:var(--ink);font-size:1.1rem}
.cta-box p{margin:8px 0 16px;font-size:.95rem}
.related{margin-top:56px}
.related h2{font-size:1.2rem}
.related .grid{grid-template-columns:repeat(3,1fr)}

/* calculator */
.calc{border:1px solid var(--line);border-radius:20px;padding:28px;margin:24px 0;box-shadow:var(--shadow)}
.calc label{display:block;margin-bottom:16px;font-weight:700;color:var(--ink);font-size:.92rem}
.calc input,.calc select{display:block;width:100%;padding:12px 14px;margin-top:6px;border:1px solid var(--line);border-radius:10px;font-size:1rem;font-family:inherit}
.calc input:focus,.calc select:focus{outline:2px solid var(--blue);border-color:transparent}
.calc-result{background:var(--soft);border-radius:14px;padding:20px;margin-top:20px}
.calc-result strong{color:var(--blue);font-size:1.3rem}

/* floating cta */
.float-cta{position:fixed;right:24px;bottom:24px;background:var(--blue);color:#fff;font-weight:700;padding:14px 22px;border-radius:999px;box-shadow:0 8px 24px rgba(36,87,230,.35);z-index:60;font-size:.95rem}
.float-cta:hover{background:var(--blue-d)}

/* footer */
.ft{background:var(--ink);color:#94a3b8;margin-top:80px}
.ft-in{max-width:1120px;margin:0 auto;padding:48px 24px;font-size:.85rem}
.ft-brand{font-weight:900;font-size:1.1rem;color:#fff;margin-bottom:16px}
.ft-brand span{color:#6d8dff}
.ft nav{margin:16px 0}
.ft a:hover{color:#fff}
.copy{color:#5b6678;margin-top:16px}

@media (max-width:840px){
  .gnb{display:none}
  .featured{grid-template-columns:1fr}
  .featured-thumb{min-height:220px}
  .featured-body{padding:24px}
  .grid{grid-template-columns:1fr}
  .related .grid{grid-template-columns:1fr}
  .tool-banner{flex-direction:column;text-align:center;padding:28px 24px}
  .post h1{font-size:1.5rem}
  .float-cta{left:24px;text-align:center}
}
@media (min-width:841px) and (max-width:1080px){
  .grid{grid-template-columns:repeat(2,1fr)}
}