*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:'Noto Sans KR',sans-serif;background:#06080F;color:#fff;overflow-x:hidden;}
::selection{background:rgba(99,102,241,.35);color:#fff;-webkit-text-fill-color:#fff;}
*{user-select:none;-webkit-user-select:none;}
body::before{
  content:'';position:fixed;inset:0;
  background-image:linear-gradient(rgba(99,102,241,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(99,102,241,.04) 1px,transparent 1px);
  background-size:52px 52px;pointer-events:none;z-index:0;
}
body::after{
  content:'';position:fixed;inset:0;
  background:radial-gradient(ellipse 70% 50% at 15% 10%,var(--accent-glow,rgba(99,102,241,.18)) 0%,transparent 60%);
  pointer-events:none;z-index:0;
}

/* ── 상단 네비 ── */
.topnav{
  position:sticky;top:0;z-index:100;
  display:flex;align-items:center;gap:12px;
  background:rgba(6,8,15,.88);backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(99,102,241,.12);
  padding:14px 24px;
}
.back{
  font-size:13px;font-weight:600;color:rgba(255,255,255,.45);
  text-decoration:none;padding:7px 14px;border-radius:8px;
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);
  transition:all .2s;white-space:nowrap;
}
.back:hover{color:rgba(255,255,255,.8);border-color:rgba(255,255,255,.2);}
.nav-title{font-size:16px;font-weight:700;color:#E2E8F0;}
.nav-ver{
  margin-left:auto;
  font-family:'JetBrains Mono',monospace;font-size:11px;
  color:rgba(99,102,241,.6);background:rgba(99,102,241,.08);
  border:1px solid rgba(99,102,241,.2);padding:4px 10px;border-radius:6px;
}

/* ── 페이지 히어로 ── */
.page-hero{
  position:relative;z-index:1;
  padding:60px 24px 48px;text-align:center;
  border-bottom:1px solid rgba(99,102,241,.1);
}
.ph-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:'JetBrains Mono',monospace;font-size:11px;letter-spacing:3px;
  color:var(--accent,#6366F1);margin-bottom:12px;
}
.ph-eyebrow::before{content:'';display:block;width:20px;height:2px;background:var(--accent,#6366F1);}
.ph-title{font-size:clamp(28px,5vw,44px);font-weight:900;margin-bottom:14px;color:#E2E8F0;}
.ph-desc{font-size:15px;color:rgba(255,255,255,.45);line-height:1.9;max-width:560px;margin:0 auto;}
.ph-desc strong{color:rgba(255,255,255,.8);}

/* ── 콘텐츠 ── */
.content{position:relative;z-index:1;max-width:920px;margin:0 auto;padding:0 24px 80px;}

.block{padding-top:56px;}
.block-label{
  font-family:'JetBrains Mono',monospace;font-size:11px;letter-spacing:3px;
  text-transform:uppercase;margin-bottom:8px;display:flex;align-items:center;gap:8px;
}
.block-label::before{content:'';display:block;width:20px;height:2px;background:currentColor;}
.block-title{font-size:clamp(22px,4vw,30px);font-weight:900;color:#E2E8F0;margin-bottom:28px;}

/* ── 카드 ── */
.card-grid4{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;}
.card{
  background:rgba(11,14,28,.7);
  border:1px solid rgba(21,27,53,1);
  border-radius:16px;padding:24px;
  transition:border-color .3s,transform .3s;
}
.card:hover{border-color:var(--b,rgba(99,102,241,.3));transform:translateY(-4px);}
.card-icon{font-size:28px;margin-bottom:14px;display:block;}
.card h3{font-size:15px;font-weight:700;color:#E2E8F0;margin-bottom:7px;}
.card p{font-size:12px;color:rgba(255,255,255,.45);line-height:1.7;}

/* ── 태그 ── */
.tag{
  display:inline-flex;align-items:center;
  font-size:11px;font-weight:600;padding:4px 10px;border-radius:6px;
  font-family:'JetBrains Mono',monospace;
}
.tag.indigo{color:#818CF8;background:rgba(99,102,241,.12);border:1px solid rgba(99,102,241,.25);}
.tag.cyan{color:#38BDF8;background:rgba(56,189,248,.1);border:1px solid rgba(56,189,248,.2);}
.tag.emerald{color:#10B981;background:rgba(16,185,129,.1);border:1px solid rgba(16,185,129,.2);}
.tag.amber{color:#F59E0B;background:rgba(245,158,11,.1);border:1px solid rgba(245,158,11,.2);}
.tag-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px;}

/* ── 문제-해결 ── */
.ps-list{display:flex;flex-direction:column;gap:10px;}
.ps-row{display:grid;grid-template-columns:1fr 36px 1fr;gap:10px;align-items:center;}
.ps-left,.ps-right{border-radius:12px;padding:16px 18px;}
.ps-left{background:rgba(239,68,68,.05);border:1px solid rgba(239,68,68,.15);}
.ps-right{background:rgba(99,102,241,.06);border:1px solid rgba(99,102,241,.18);}
.ps-tag{font-family:'JetBrains Mono',monospace;font-size:10px;letter-spacing:2px;margin-bottom:6px;font-weight:700;}
.ps-tag.red{color:#EF4444;}
.ps-tag.blue{color:#6366F1;}
.ps-left p,.ps-right p{font-size:13px;color:rgba(255,255,255,.65);line-height:1.6;}
.ps-arrow{text-align:center;font-size:18px;color:rgba(99,102,241,.4);}

/* ── 로드맵 ── */
.roadmap{display:flex;flex-direction:column;}
.rm-item{display:flex;gap:20px;}
.rm-left{display:flex;flex-direction:column;align-items:center;}
.rm-dot{width:14px;height:14px;border-radius:50%;flex-shrink:0;margin-top:22px;}
.rm-line{width:2px;flex:1;min-height:32px;}
.rm-body{padding:16px 0 32px;flex:1;}
.rm-phase{font-family:'JetBrains Mono',monospace;font-size:10px;letter-spacing:2px;margin-bottom:6px;font-weight:700;}
.rm-body h3{font-size:16px;font-weight:700;color:#E2E8F0;margin-bottom:6px;}
.rm-body p{font-size:13px;color:rgba(255,255,255,.45);line-height:1.75;}

/* ── 통계 카드 ── */
.stat-row{display:flex;gap:16px;flex-wrap:wrap;}
.stat-card{
  flex:1;min-width:160px;
  background:rgba(11,14,28,.7);border:1px solid rgba(21,27,53,1);
  border-radius:16px;padding:24px;text-align:center;
}
.sc-num{font-size:30px;font-weight:900;font-family:'JetBrains Mono',monospace;margin-bottom:6px;}
.sc-label{font-size:12px;color:rgba(255,255,255,.35);}

/* ── 푸터 ── */
.sub-footer{
  position:relative;z-index:1;
  text-align:center;padding:36px 24px;
  border-top:1px solid rgba(99,102,241,.08);
  font-size:12px;color:rgba(255,255,255,.2);
}
.sub-footer a{color:rgba(99,102,241,.5);text-decoration:none;}
.sub-footer a:hover{color:#818CF8;}

@media(max-width:560px){
  .ps-row{grid-template-columns:1fr;}.ps-arrow{display:none;}
  .card-grid4{grid-template-columns:1fr 1fr;}
}