/* ── Reset ─────────────────────────────────────── */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

/* ── Tokens ─────────────────────────────────────── */
:root{
  --bg:#fff;--bg2:#f7f8f9;--bg3:#ecfeff;
  --border:rgba(0,0,0,0.07);--border2:rgba(0,0,0,0.11);
  --text:#0f0e1a;--muted:#7878a0;--muted2:#b4b4cc;
  --accent:#06b6d4;--accent2:#67e8f9;
  --max-w:760px;--nav-h:56px;
}

/* ── Base ───────────────────────────────────────── */
body{
  font-family:'DM Sans',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  background:var(--bg);color:var(--text);
  font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;
  display:flex;flex-direction:column;min-height:100vh;
}
main{flex:1}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* ── NAV ────────────────────────────────────────── */
.nav{
  position:sticky;top:0;z-index:100;
  height:var(--nav-h);
  background:rgba(255,255,255,0.92);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 48px;
}
.nav-logo{
  font-family:'DM Sans',sans-serif;font-size:19px;font-weight:800;
  letter-spacing:-0.5px;display:flex;align-items:center;
  gap:0;text-decoration:none;line-height:1;
}
.nav-logo:hover{text-decoration:none}
.nav-logo img{height:36px;width:auto;display:block}
.nav-logo-k  {color:var(--accent);display:inline-block}
.nav-logo-ybr{color:var(--text);display:inline-block}
.nav-links{display:flex;align-items:center;gap:20px}
.nav-link{
  font-size:13px;font-weight:500;color:var(--muted);
  text-decoration:none;white-space:nowrap;transition:color .15s;
}
.nav-link:hover{color:var(--text);text-decoration:none}
.nav-link.active{color:var(--accent);font-weight:600}
.nav-cta{
  font-size:13px;font-weight:700;color:#fff;
  background:var(--accent);padding:7px 16px;border-radius:8px;
  text-decoration:none;transition:opacity .15s;white-space:nowrap;
}
.nav-cta:hover{opacity:.85;text-decoration:none}

/* ── PAGE ───────────────────────────────────────── */
.page{max-width:var(--max-w);margin:0 auto;padding:52px 24px 96px;width:100%}

/* ── BREADCRUMB ─────────────────────────────────── */
.breadcrumb{
  display:flex;align-items:center;gap:6px;
  font-size:12px;color:var(--muted2);
  margin-bottom:32px;flex-wrap:wrap;
}
.breadcrumb a{color:var(--muted2);text-decoration:none}
.breadcrumb a:hover{color:var(--muted)}

/* ── PAGE HEADER ────────────────────────────────── */
.page-header{margin-bottom:44px;padding-bottom:32px;border-bottom:1px solid var(--border)}
.page-eyebrow{
  font-size:11px;font-weight:700;letter-spacing:1.2px;
  text-transform:uppercase;color:var(--accent);margin-bottom:10px;
}
.page-title{
  font-size:clamp(26px,5vw,36px);font-weight:800;
  letter-spacing:-1.2px;color:var(--text);
  line-height:1.1;margin-bottom:16px;
}
.page-meta{font-size:13px;color:var(--muted2);display:flex;flex-wrap:wrap;gap:4px 16px}

/* ── TOC ────────────────────────────────────────── */
.toc{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:14px;padding:22px 26px;margin-bottom:48px;
}
.toc-title{
  font-size:11px;font-weight:700;letter-spacing:.8px;
  text-transform:uppercase;color:var(--muted);margin-bottom:14px;
}
.toc-list{list-style:none;display:flex;flex-direction:column;gap:5px}
.toc-list li a{
  font-size:13px;color:var(--muted);font-weight:500;
  text-decoration:none;display:flex;align-items:center;gap:10px;
  padding:3px 0;transition:color .15s;
}
.toc-list li a:hover{color:var(--accent);text-decoration:none}
.toc-list li a.toc-active{color:var(--accent);font-weight:600}
.toc-num{font-size:10px;font-weight:700;color:var(--accent2);min-width:24px;flex-shrink:0}

/* ── ARTICLE ────────────────────────────────────── */
.article section{padding-bottom:40px;margin-bottom:40px;border-bottom:1px solid var(--border)}
.article section:last-child{border-bottom:none;padding-bottom:0;margin-bottom:0}
.article h2{
  font-size:19px;font-weight:800;letter-spacing:-0.4px;color:var(--text);
  margin-bottom:16px;padding-top:4px;
  display:flex;align-items:baseline;flex-wrap:wrap;gap:10px;line-height:1.3;
}
.art-num{
  font-size:10px;font-weight:700;color:var(--accent);
  letter-spacing:.5px;text-transform:uppercase;flex-shrink:0;
}
.article h3{font-size:14px;font-weight:700;color:var(--text);margin:22px 0 10px;letter-spacing:-0.2px}
.article p{font-size:15px;color:var(--muted);line-height:1.75;margin-bottom:12px}
.article p:last-child{margin-bottom:0}
.article ul,.article ol{padding-left:20px;margin-bottom:12px}
.article li{font-size:15px;color:var(--muted);line-height:1.75;margin-bottom:4px}
.article strong{color:var(--text);font-weight:600}

/* ── SPECIAL BLOCKS ─────────────────────────────── */
.notice{
  background:rgba(6,182,212,.05);
  border:1px solid rgba(6,182,212,.15);
  border-left:3px solid var(--accent);
  border-radius:0 10px 10px 0;
  padding:14px 18px;margin-bottom:14px;
  font-size:14px;color:var(--muted);line-height:1.65;
}
.notice strong{color:var(--text)}

.contact-card{background:var(--bg2);border:1px solid var(--border);border-radius:12px;padding:20px 24px}
.contact-card p{font-size:15px;color:var(--muted);margin-bottom:6px}
.contact-card p:last-child{margin-bottom:0}

.legal-note{font-size:13px;color:var(--muted2);font-style:italic;margin-top:20px;line-height:1.65}

/* ── FOOTER ─────────────────────────────────────── */
.footer{
  border-top:1px solid var(--border);background:var(--bg2);
  padding:22px 48px;display:flex;flex-wrap:wrap;
  justify-content:space-between;align-items:center;
  gap:12px;font-size:12px;color:var(--muted2);
}
.footer-links{display:flex;flex-wrap:wrap;gap:16px;align-items:center}
.footer a{color:var(--muted2);text-decoration:none;transition:color .15s}
.footer a:hover{color:var(--text)}
.footer a.active{color:var(--accent);font-weight:600}
.footer-x{display:inline-flex;align-items:center}

/* ── RESPONSIVE ─────────────────────────────────── */
@media(max-width:640px){
  .nav{padding:0 16px}
  .nav-links .nav-link:not(.nav-cta){display:none}
  .page{padding:40px 16px 72px}
  .toc{padding:16px 18px}
  .footer{flex-direction:column;align-items:flex-start;padding:20px 16px}
}


/* ── BLOG INDEX ─────────────────────────────────── */
.page-wide{max-width:1100px}
.page-lead{font-size:16px;color:var(--muted);line-height:1.7}
.blog-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;list-style:none}
.card{
  display:flex;flex-direction:column;height:100%;
  border:1px solid var(--border2);border-radius:16px;overflow:hidden;
  background:var(--bg);color:var(--text);
  transition:box-shadow .2s,transform .2s;
}
.card:hover{text-decoration:none;box-shadow:0 8px 32px rgba(15,14,26,.08);transform:translateY(-2px)}
.card-thumb{aspect-ratio:16/9;overflow:hidden;background:var(--bg2)}
.card-thumb img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .3s}
.card:hover .card-thumb img{transform:scale(1.03)}
.card-body{padding:22px 24px 24px;flex:1;display:flex;flex-direction:column}
.card-tag{font-size:11px;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:var(--accent);margin-bottom:10px}
.card-title{font-size:18px;font-weight:800;letter-spacing:-.4px;line-height:1.35;margin-bottom:10px;transition:color .15s}
.card:hover .card-title{color:var(--accent)}
.card-desc{font-size:13px;color:var(--muted);line-height:1.7;flex:1;margin-bottom:16px}
.card-meta{font-size:12px;color:var(--muted2);display:flex;align-items:center;gap:8px}
.dot{width:3px;height:3px;border-radius:50%;background:var(--muted2);display:inline-block}

/* ── POST ───────────────────────────────────────── */
.post-title{font-size:clamp(28px,4.4vw,40px);letter-spacing:-1.4px;line-height:1.15}
.page-meta .dot{align-self:center}
.post-hero{margin:0 0 44px;border-radius:16px;overflow:hidden;aspect-ratio:16/9;background:var(--bg2)}
.post-hero img{width:100%;height:100%;object-fit:cover;display:block}
.post-body{font-size:17px;color:#2d2d3a;line-height:1.85}
.post-body p{margin-bottom:24px}
.post-body h2{font-size:26px;font-weight:800;letter-spacing:-.8px;color:var(--text);margin:56px 0 16px;line-height:1.3}
.post-body h3{font-size:19px;font-weight:700;letter-spacing:-.3px;color:var(--text);margin:36px 0 12px}
.post-body ul,.post-body ol{padding-left:24px;margin-bottom:24px}
.post-body li{margin-bottom:8px}
.post-body strong{font-weight:700;color:var(--text)}
.post-body blockquote{
  border-left:3px solid var(--accent);background:rgba(6,182,212,.05);
  border-radius:0 10px 10px 0;padding:14px 20px;margin:32px 0;
  font-style:italic;color:var(--muted);
}
.post-body blockquote cite{display:block;margin-top:12px;font-style:normal;font-size:14px;font-weight:600;color:var(--text)}
.post-img{margin:32px 0}
.post-img img{width:100%;height:auto;display:block;border-radius:12px;background:var(--bg2)}
.post-img figcaption,.img-grid figcaption{font-size:12px;color:var(--muted2);margin-top:8px;text-align:center;line-height:1.5}
.img-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:32px 0}
.img-grid img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;display:block;border-radius:12px;background:var(--bg2)}
.callout{background:var(--bg2);border:1px solid var(--border);border-radius:14px;padding:20px 24px;margin:32px 0}
.callout-title{font-size:13px!important;font-weight:700;color:var(--text);margin-bottom:8px!important}
.callout ul{padding-left:20px;margin-bottom:0}
.callout li{font-size:15px;margin-bottom:6px}
.cta-banner{
  background:linear-gradient(135deg,#0a1628,#0f1f3d);
  border-radius:16px;padding:36px 40px;margin:64px 0 0;text-align:center;
}
.cta-banner h2{font-size:22px;font-weight:800;color:#fff;letter-spacing:-.6px;margin-bottom:10px}
.cta-banner p{font-size:15px;color:rgba(255,255,255,.6);margin-bottom:24px}
.cta-btn{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--accent);color:#fff;font-size:15px;font-weight:700;
  padding:13px 32px;border-radius:11px;transition:opacity .15s;
}
.cta-btn:hover{opacity:.88;text-decoration:none}
.back-link{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--muted);margin-top:40px;transition:color .15s}
.back-link:hover{color:var(--accent);text-decoration:none}

@media(max-width:900px){
  .blog-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .blog-grid{grid-template-columns:1fr}
  .post-body{font-size:16px}
  .post-body h2{font-size:22px;margin-top:44px}
  .img-grid{grid-template-columns:1fr}
  .cta-banner{padding:28px 22px}
}