/* ============================================
   빌캠교실 블로그 · v2 Notion-style Redesign
   ============================================ */
:root{
  --bg:#f7f5ee;
  --bg-soft:#f0ecdf;
  --card:#ffffff;
  --text:#171a2e;
  --text-soft:#3d4256;
  --muted:#737a8c;
  --line:#e8e2d0;
  --line-soft:#f1ecdf;
  --brand:#5b3cff;
  --brand2:#8c72ff;
  --brand-soft:#efe9ff;
  --accent:#ff7a59;
  --accent-soft:#ffeee7;
  --mint:#10b981;
  --mint-soft:#e3f6ee;
  --sand:#c89456;
  --sand-soft:#faf0dd;
  --rose:#ec4899;
  --rose-soft:#fde6f0;
  --indigo:#4f46e5;
  --indigo-soft:#ebeaff;
  --shadow-xs:0 1px 2px rgba(18,23,42,.04);
  --shadow-sm:0 4px 12px -4px rgba(18,23,42,.08);
  --shadow:0 18px 38px -18px rgba(18,23,42,.18);
  --shadow-lg:0 30px 60px -24px rgba(18,23,42,.28);
  --radius:22px;
  --radius-sm:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Pretendard","Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background:
    radial-gradient(900px 500px at 8% -10%, rgba(91,60,255,.08), transparent 55%),
    radial-gradient(700px 420px at 100% 5%, rgba(255,122,89,.08), transparent 55%),
    radial-gradient(800px 500px at 50% 100%, rgba(140,114,255,.05), transparent 60%);
  z-index:0;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:1240px;margin:0 auto;padding:0 24px;position:relative;z-index:1}

/* ---------- Topbar ---------- */
.topbar{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(247,245,238,.85);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{
  min-height:74px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}
.brand{
  display:flex;
  align-items:center;
  gap:14px;
  font-weight:900;
  font-size:17px;
  letter-spacing:-.01em;
}
.brand-mark{
  width:44px;
  height:44px;
  border-radius:14px;
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  display:grid;
  place-items:center;
  color:#fff;
  font-weight:900;
  box-shadow:0 10px 22px -10px rgba(91,60,255,.55);
}
.brand small{
  display:block;
  color:var(--muted);
  font-size:11px;
  letter-spacing:.14em;
  font-weight:700;
  margin-top:2px;
}
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav a{
  padding:10px 14px;
  border-radius:999px;
  font-weight:700;
  font-size:14.5px;
  color:var(--text-soft);
  transition:all .2s ease;
}
.nav a:hover{background:#fff;color:var(--brand);box-shadow:var(--shadow-xs)}

/* ---------- Layout: page shell with sidebar ---------- */
.page{
  display:grid;
  grid-template-columns:280px minmax(0,1fr);
  gap:36px;
  padding:48px 0 32px;
  align-items:flex-start;
}
.page.single{
  grid-template-columns:260px minmax(0,1fr);
}

/* ---------- Sidebar ---------- */
.sidebar{
  position:sticky;
  top:96px;
  display:flex;
  flex-direction:column;
  gap:18px;
}
.side-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:20px;
  padding:22px 20px;
  box-shadow:var(--shadow-xs);
}
.side-card h4{
  margin:0 0 14px;
  font-size:12px;
  font-weight:900;
  color:var(--muted);
  letter-spacing:.12em;
  text-transform:uppercase;
  display:flex;
  align-items:center;
  gap:8px;
}
.side-card h4 .dot{
  width:6px;height:6px;border-radius:50%;
  background:linear-gradient(135deg,var(--brand),var(--brand2));
}
.side-list{
  display:flex;
  flex-direction:column;
  gap:2px;
  margin:0;padding:0;list-style:none;
}
.side-list a{
  display:flex;
  align-items:center;
  gap:11px;
  padding:9px 11px;
  border-radius:10px;
  font-size:14px;
  font-weight:700;
  color:var(--text-soft);
  transition:all .15s ease;
}
.side-list a:hover{background:var(--bg-soft);color:var(--text)}
.side-list a.active{background:var(--brand-soft);color:var(--brand)}
.side-list .icon{
  width:24px;height:24px;border-radius:7px;
  display:grid;place-items:center;
  font-size:13px;
  flex-shrink:0;
}
.icon.bg-purple{background:var(--brand-soft);color:var(--brand)}
.icon.bg-orange{background:var(--accent-soft);color:var(--accent)}
.icon.bg-mint{background:var(--mint-soft);color:var(--mint)}
.icon.bg-sand{background:var(--sand-soft);color:var(--sand)}
.icon.bg-rose{background:var(--rose-soft);color:var(--rose)}
.icon.bg-indigo{background:var(--indigo-soft);color:var(--indigo)}
.side-count{
  margin-left:auto;
  font-size:11.5px;
  font-weight:800;
  color:var(--muted);
  background:var(--bg-soft);
  padding:2px 8px;
  border-radius:999px;
}

/* ---------- Naver CTA (refined / on-tone) ---------- */
.naver-cta{
  display:block;
  position:relative;
  overflow:hidden;
  padding:22px 20px 24px;
  border-radius:20px;
  background:
    radial-gradient(180px 120px at 100% 0%, rgba(255,122,89,.25), transparent 70%),
    linear-gradient(155deg,#1a1538 0%,#2a1d6b 60%,#3a2887 100%);
  color:#fff;
  border:1px solid rgba(255,255,255,.08);
  box-shadow:0 18px 38px -18px rgba(58,40,135,.55);
  text-decoration:none;
}
.naver-cta::after{
  content:"";
  position:absolute;
  right:-30px;
  bottom:-30px;
  width:140px;height:140px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.12),transparent 70%);
}
.naver-cta-row{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:12px;
  position:relative;
}
.naver-badge{
  display:inline-grid;
  place-items:center;
  width:32px;height:32px;
  border-radius:9px;
  background:#fff;
  color:#03c75a;
  font-weight:900;
  font-size:18px;
  font-family:Georgia,serif;
  box-shadow:0 4px 12px rgba(0,0,0,.18);
}
.naver-tag{
  font-size:11px;
  font-weight:800;
  letter-spacing:.1em;
  color:rgba(255,255,255,.65);
}
.naver-cta h4{
  margin:0 0 6px;
  font-size:17px;
  font-weight:900;
  letter-spacing:-.015em;
  position:relative;
  color:#fff;
}
.naver-cta p{
  margin:0 0 16px;
  font-size:13.5px;
  line-height:1.6;
  color:rgba(255,255,255,.78);
  position:relative;
}
.naver-go{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:11px 16px;
  background:rgba(255,255,255,.14);
  border:1px solid rgba(255,255,255,.22);
  border-radius:11px;
  font-size:13.5px;
  font-weight:800;
  color:#fff;
  backdrop-filter:blur(4px);
  position:relative;
  transition:all .2s ease;
}
.naver-cta:hover .naver-go{background:rgba(255,255,255,.22);transform:translateX(2px)}

/* Mini about card */
.about-mini{
  background:linear-gradient(155deg,#fff 0%,#faf6ea 100%);
  border:1px solid var(--line);
  border-radius:20px;
  padding:22px 20px;
  box-shadow:var(--shadow-xs);
}
.about-mini-head{
  display:flex;align-items:center;gap:11px;margin-bottom:10px;
}
.about-avatar{
  width:38px;height:38px;
  border-radius:12px;
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  display:grid;place-items:center;
  color:#fff;font-weight:900;font-size:14px;
  box-shadow:0 6px 14px -6px rgba(91,60,255,.55);
}
.about-mini-head strong{font-size:14.5px}
.about-mini-head span{display:block;font-size:11.5px;color:var(--muted);font-weight:700}
.about-mini p{
  margin:0;
  font-size:13px;
  color:var(--text-soft);
  line-height:1.65;
}

/* ---------- Hero (listing main) ---------- */
.main-hero{margin-bottom:28px}
.hero-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:7px 13px;
  border-radius:999px;
  background:var(--brand-soft);
  color:var(--brand);
  font-weight:800;
  font-size:12px;
  letter-spacing:.08em;
}
.main-hero h1{
  margin:14px 0 12px;
  font-size:clamp(30px,4vw,44px);
  line-height:1.18;
  letter-spacing:-.025em;
  font-weight:900;
}
.main-hero h1 em{
  font-style:normal;
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.main-hero p{
  margin:0;
  font-size:16px;
  color:var(--text-soft);
  max-width:600px;
}

/* ---------- Filter chips ---------- */
.filters{
  display:flex;
  gap:8px;
  flex-wrap:wrap;
  margin:24px 0 22px;
}
.chip{
  padding:8px 14px;
  border-radius:999px;
  background:#fff;
  border:1px solid var(--line);
  font-size:13px;
  font-weight:700;
  color:var(--text-soft);
  cursor:pointer;
  transition:all .18s ease;
}
.chip:hover{border-color:var(--brand);color:var(--brand)}
.chip.active{background:var(--text);color:#fff;border-color:var(--text)}

/* ---------- Card grid (Notion-style) ---------- */
.grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:20px;
}
.card{
  position:relative;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:24px 24px 26px;
  box-shadow:var(--shadow-xs);
  transition:transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  display:flex;
  flex-direction:column;
  min-height:200px;
  text-decoration:none;
  color:inherit;
}
.card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow);
  border-color:#dcd2b8;
}
.card-top{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:14px;
  margin-bottom:10px;
}
.card .tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 12px;
  border-radius:999px;
  font-size:11.5px;
  font-weight:800;
  letter-spacing:.04em;
}
.tag .ic{font-size:11px}
.tag.cat-ai{background:var(--brand-soft);color:var(--brand)}
.tag.cat-flow{background:var(--mint-soft);color:var(--mint)}
.tag.cat-course{background:var(--accent-soft);color:var(--accent)}
.tag.cat-edu{background:var(--sand-soft);color:var(--sand)}
.tag.cat-term{background:var(--indigo-soft);color:var(--indigo)}
.tag.cat-contest{background:var(--rose-soft);color:var(--rose)}

.arrow-circle{
  width:36px;height:36px;
  border-radius:50%;
  background:var(--text);
  color:#fff;
  display:grid;
  place-items:center;
  flex-shrink:0;
  transition:transform .25s ease, background .25s ease;
}
.card:hover .arrow-circle{transform:translate(2px,-2px) rotate(-8deg);background:var(--brand)}
.arrow-circle svg{width:16px;height:16px}

.card h2{
  margin:6px 0 10px;
  font-size:19px;
  line-height:1.35;
  font-weight:900;
  letter-spacing:-.015em;
}
.card p{
  margin:0;
  color:var(--muted);
  font-size:14px;
  line-height:1.65;
  flex:1;
}
.card-foot{
  display:flex;
  align-items:center;
  gap:10px;
  margin-top:18px;
  color:var(--muted);
  font-size:12px;
  font-weight:700;
}
.card-foot .dot{width:3px;height:3px;background:var(--muted);border-radius:50%}

/* Featured card */
.card.featured{
  grid-column:span 2;
  flex-direction:row;
  align-items:stretch;
  padding:0;
  overflow:hidden;
  min-height:240px;
}
.card.featured .fc-media{
  flex:1;
  background:
    radial-gradient(420px 240px at 80% 20%, rgba(255,255,255,.22), transparent 60%),
    linear-gradient(135deg,#1c1546 0%,#5b3cff 55%,#8c72ff 100%);
  color:#fff;
  padding:36px 38px;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  position:relative;
}
.card.featured .fc-media::after{
  content:"";
  position:absolute;
  right:-50px;bottom:-50px;
  width:200px;height:200px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.16),transparent 70%);
}
.card.featured .fc-media span.eyebrow{
  display:inline-block;
  padding:6px 12px;
  border-radius:999px;
  background:rgba(255,255,255,.16);
  color:#fff;
  font-size:11px;
  font-weight:800;
  letter-spacing:.08em;
  position:relative;
}
.card.featured .fc-media h2{
  margin:14px 0 8px;
  font-size:28px;
  line-height:1.22;
  font-weight:900;
  color:#fff;
  letter-spacing:-.02em;
  position:relative;
}
.card.featured .fc-media p{
  color:rgba(255,255,255,.85);
  font-size:14.5px;
  max-width:440px;
  position:relative;
}
.card.featured .fc-body{
  flex:.9;
  padding:36px;
  display:flex;
  flex-direction:column;
  justify-content:center;
  background:#fff;
}
.card.featured .fc-body h3{
  font-size:13px;
  margin:0 0 12px;
  color:var(--muted);
  font-weight:800;
  letter-spacing:.06em;
  text-transform:uppercase;
}
.card.featured .fc-body ul{
  margin:0;padding:0;list-style:none;
  display:flex;flex-direction:column;gap:9px;
}
.card.featured .fc-body li{
  display:flex;gap:10px;color:var(--text-soft);font-size:14px;
}
.card.featured .fc-body li::before{
  content:"✓";color:var(--brand);font-weight:900;
}
.card.featured .fc-body .arrow-circle{
  align-self:flex-start;
  margin-top:18px;
}

/* ---------- CTA panel ---------- */
.cta-panel{
  margin:48px 0 24px;
  background:
    radial-gradient(600px 340px at 10% 0%, rgba(140,114,255,.24), transparent 60%),
    linear-gradient(135deg,#0f1330 0%,#1a1648 60%,#2b1d6a 100%);
  color:#fff;
  border-radius:26px;
  padding:42px 38px;
  box-shadow:var(--shadow);
  overflow:hidden;
  position:relative;
}
.cta-panel::after{
  content:"";
  position:absolute;
  right:-80px;top:-80px;
  width:280px;height:280px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(255,122,89,.25),transparent 70%);
}
.cta-panel h2{margin:0 0 10px;font-size:26px;font-weight:900;letter-spacing:-.02em;position:relative}
.cta-panel p{margin:0;color:#d8d9ea;font-size:15px;position:relative;max-width:560px}
.cta-actions{margin-top:22px;display:flex;gap:10px;flex-wrap:wrap;position:relative}
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:12px 18px;
  border-radius:12px;
  font-weight:800;
  font-size:14px;
  border:1px solid rgba(255,255,255,.15);
  transition:transform .2s ease;
  text-decoration:none;
}
.btn:hover{transform:translateY(-2px)}
.btn.primary{
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  color:#fff;
  border:none;
  box-shadow:0 14px 30px -10px rgba(140,114,255,.55);
}
.btn.ghost{background:rgba(255,255,255,.08);color:#fff;backdrop-filter:blur(6px)}

/* ---------- Footer ---------- */
.footer{
  padding:32px 0 50px;
  color:var(--muted);
  font-size:13px;
  text-align:center;
  border-top:1px solid var(--line);
  margin-top:32px;
}

/* ============================================
   Blog post (detail page)
   ============================================ */
.post-hero{
  margin-bottom:24px;
}
.post-hero .tag{
  display:inline-flex;
  padding:6px 13px;
  border-radius:999px;
  font-size:11.5px;
  font-weight:800;
  letter-spacing:.06em;
  background:var(--brand-soft);
  color:var(--brand);
}
.post-hero h1{
  margin:14px 0 14px;
  font-size:clamp(28px,3.6vw,40px);
  line-height:1.22;
  font-weight:900;
  letter-spacing:-.022em;
}
.post-meta{
  display:flex;
  gap:14px;
  align-items:center;
  color:var(--muted);
  font-size:13.5px;
  flex-wrap:wrap;
}
.post-meta .author{
  display:flex;align-items:center;gap:8px;
  color:var(--text-soft);font-weight:700;
}
.post-meta .author .av{
  width:24px;height:24px;border-radius:7px;
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  color:#fff;display:grid;place-items:center;
  font-size:11px;font-weight:900;
}
.post-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--muted)}

.post-article{
  background:#fff;
  border:1px solid var(--line);
  border-radius:24px;
  padding:42px 46px;
  box-shadow:var(--shadow-sm);
  margin-bottom:22px;
}
.post-article .hook{
  font-size:17.5px;
  font-weight:700;
  color:var(--text);
  line-height:1.75;
  padding:20px 22px;
  background:var(--bg-soft);
  border-left:4px solid var(--brand);
  border-radius:12px;
  margin:0 0 26px;
}
.post-article p{font-size:16px;color:var(--text-soft);line-height:1.85;margin:14px 0}
.post-article h2{
  margin:36px 0 12px;
  font-size:22px;
  font-weight:900;
  letter-spacing:-.015em;
  position:relative;
  padding-left:16px;
}
.post-article h2::before{
  content:"";
  position:absolute;
  left:0;top:9px;bottom:9px;
  width:4px;
  border-radius:4px;
  background:linear-gradient(180deg,var(--brand),var(--brand2));
}
.post-article .callout{
  margin:26px 0;
  padding:22px 24px;
  background:linear-gradient(135deg,var(--brand-soft),#fff);
  border:1px solid #e4dcff;
  border-radius:16px;
}
.post-article .callout b{color:var(--brand)}

.post-cta{
  background:#fff;
  border:1px solid var(--line);
  border-radius:22px;
  padding:32px 36px;
  text-align:center;
  box-shadow:var(--shadow-sm);
}
.post-cta h2{margin:0 0 8px;font-size:20px;font-weight:900}
.post-cta p{margin:0 0 18px;color:var(--muted);font-size:14.5px}
.post-cta-row{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.post-cta .cta-btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:12px 18px;
  border-radius:12px;
  font-weight:800;
  font-size:14px;
  border:1px solid var(--line);
  background:#fff;
  color:var(--text);
  transition:all .2s ease;
  text-decoration:none;
}
.post-cta .cta-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.post-cta .cta-btn.primary{
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  color:#fff;
  border:none;
  box-shadow:0 12px 26px -10px rgba(140,114,255,.55);
}

/* Related posts */
.related{margin-top:36px}
.related h3{
  font-size:13px;
  font-weight:900;
  color:var(--muted);
  letter-spacing:.1em;
  text-transform:uppercase;
  margin:0 0 14px;
}
.related-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:14px;
}
.related-grid a{
  display:block;
  padding:18px 20px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:16px;
  transition:all .2s ease;
  text-decoration:none;
}
.related-grid a:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:var(--shadow-xs)}
.related-grid span{font-size:11px;font-weight:800;color:var(--brand);letter-spacing:.06em}
.related-grid strong{display:block;margin-top:6px;font-size:14px;line-height:1.4;color:var(--text)}

/* ---------- Responsive ---------- */
@media (max-width:1080px){
  .page,.page.single{grid-template-columns:1fr;gap:24px}
  .sidebar{position:static;flex-direction:row;flex-wrap:wrap;gap:14px}
  .sidebar > *{flex:1;min-width:240px}
}
@media (max-width:780px){
  .nav{display:none}
  .grid{grid-template-columns:1fr}
  .card.featured{grid-column:span 1;flex-direction:column}
  .card.featured .fc-media,.card.featured .fc-body{padding:30px 28px}
  .post-article{padding:32px 24px}
  .post-cta{padding:26px 22px}
  .related-grid{grid-template-columns:1fr}
  .cta-panel{padding:34px 24px}
  .sidebar{flex-direction:column}
  .sidebar > *{min-width:0;width:100%}
}