:root{--navy:#0a1931;--gold:#ffd700;--bg:#f4f6f8;--ink:#18263b;--muted:#5d6b7d;--line:#dce2e9}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,'Malgun Gothic',sans-serif;line-height:1.6}header{background:var(--navy);color:white;padding:23px max(24px,calc((100vw - 1280px)/2));display:flex;justify-content:space-between;gap:20px;font-size:13px;border-bottom:3px solid var(--gold)}.brand{font-weight:750;letter-spacing:1.6px}main{max-width:1328px;margin:auto;padding:52px 24px 28px}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--muted);font-weight:700}h1{font-size:clamp(32px,4vw,52px);line-height:1.25;letter-spacing:-2px;margin:14px 0 20px}h2{font-size:20px;margin:0 0 8px}h3{font-size:16px;margin:0 0 12px}p{margin:8px 0}.intro{margin-bottom:32px}.notice{border-left:3px solid #b68d00;background:#fff9df;padding:12px 16px;font-size:14px;margin-top:24px}.layout{display:grid;grid-template-columns:350px minmax(0,1fr);gap:24px;align-items:start}.panel{border:1px solid var(--line);background:white;border-radius:12px;padding:24px}.muted{color:var(--muted);font-size:13px}.fields{display:grid;grid-template-columns:1fr 1fr;gap:16px 12px;margin:24px 0}.fields label{display:block;font-size:12px;font-weight:650}.fields input{font:inherit;width:100%;min-height:44px;border:1px solid #b9c4d1;border-radius:6px;padding:9px;margin-top:5px;color:var(--ink)}input:focus-visible,button:focus-visible{outline:3px solid #2572cf;outline-offset:3px}.buttons{display:flex;gap:8px}button{min-height:46px;padding:10px 16px;border:0;border-radius:7px;background:var(--navy);color:white;font:inherit;font-size:14px;font-weight:700;cursor:pointer}button:disabled{opacity:.55;cursor:wait}.secondary{background:#edf0f4;color:var(--ink)}#status{font-size:13px;margin-top:14px}.result-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:0 0 18px}.pill{font-size:12px;background:#e5eaf1;padding:6px 10px;border-radius:30px}.empty{min-height:420px;border:1px dashed #b8c3d1;border-radius:12px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px;text-align:center;color:var(--muted)}.empty>span{font-size:42px;color:#9aa9bc;letter-spacing:5px;margin-bottom:24px}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.card{background:white;border:1px solid var(--line);border-radius:10px;padding:20px}.card.highlight{background:var(--navy);color:white;border-top:4px solid var(--gold)}.card .label{font-size:13px}.card strong{display:block;font-size:clamp(20px,2.1vw,28px);letter-spacing:-1px;margin:8px 0}.card small{display:block;font-size:12px}.comparison{padding:16px 0;color:var(--muted);font-size:13px}.chart{margin:4px 0 18px}svg{width:100%;height:auto;display:block}.legend{font-size:12px;color:#65758c;text-align:right}.legend span{color:#0a6a8c;margin-left:18px}.table-scroll{overflow-x:auto}table{border-collapse:collapse;width:100%;white-space:nowrap;font-size:12px;text-align:right}th,td{padding:13px 10px;border-bottom:1px solid var(--line)}th{background:#f5f7fa;font-weight:600}.explanation{margin-top:26px}.explain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin:22px 0}.explain-grid p{font-size:14px;color:var(--muted)}footer{font-size:12px;color:var(--muted);padding:24px 0}.negative{color:#bb3434}
.level-panel{margin-bottom:24px;background:white;border:1px solid var(--line);border-radius:12px;padding:24px}
.level-header{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:8px}
.level-tabs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:18px 0}
.level-btn{background:#edf0f4;color:var(--ink);border:2px solid transparent;border-radius:10px;padding:14px;text-align:left;display:flex;flex-direction:column;min-height:92px;cursor:pointer;transition:all .18s ease}
.level-btn:hover{background:#f8fafd;border-color:#2572cf}
.level-btn.active{background:var(--navy);color:white;border-color:var(--gold);box-shadow:0 6px 16px rgba(10,25,49,.16)}
.level-tag{font-size:11px;font-weight:800;letter-spacing:1px;color:#758599;margin-bottom:4px}
.level-btn.active .level-tag{color:var(--gold)}
.level-btn strong{font-size:13px;font-weight:700;margin-bottom:4px;display:block}
.level-btn small{font-size:11px;color:var(--muted);line-height:1.35;display:block}
.level-btn.active small{color:#c7d4e5}
.level-mission{background:#f8fafd;border:1px solid #dce2e9;border-left:4px solid var(--navy);border-radius:8px;padding:16px 20px;margin-top:14px}
.mission-header{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.mission-header h3{margin:0;font-size:15px;color:var(--ink)}
.mission-badge{background:var(--gold);color:var(--navy);font-size:11px;font-weight:800;padding:3px 8px;border-radius:4px;white-space:nowrap}
.mission-challenge{margin-top:10px;padding-top:10px;border-top:1px dashed #dce2e9;font-size:13px;color:var(--ink)}
@media(max-width:1000px){.level-tabs{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.level-tabs{grid-template-columns:1fr}.level-header{flex-direction:column;align-items:flex-start}}

/* 10 Essential Simulators Hub Styles */
.sim-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin:20px 0}
@media(max-width:1024px){.sim-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:640px){.sim-grid{grid-template-columns:repeat(2,1fr)}}
.sim-card-tab{background:#fff;border:2px solid var(--line);border-radius:12px;padding:14px 10px;text-align:center;cursor:pointer;transition:all .2s ease;display:flex;flex-direction:column;align-items:center;gap:5px}
.sim-card-tab:hover{border-color:#2572cf;transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.06)}
.sim-card-tab.is-active{background:var(--navy);color:#fff;border-color:var(--gold);box-shadow:0 6px 18px rgba(10,25,49,.18)}
.sim-card-icon{font-size:26px;line-height:1}
.sim-card-num{font-size:10px;font-weight:800;letter-spacing:1px;color:var(--muted)}
.sim-card-tab.is-active .sim-card-num{color:var(--gold)}
.sim-card-title{font-size:12px;font-weight:700;line-height:1.3}
.sim-card-badge{font-size:10px;padding:2px 6px;background:#f1f5f9;border-radius:4px;color:#475569}
.sim-card-tab.is-active .sim-card-badge{background:rgba(255,255,255,.15);color:#f8fafc}
.sim-workspace{background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 8px 24px rgba(0,0,0,.04);overflow:hidden}
.sim-ws-header{padding:20px 24px;background:#f8fafc;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.sim-formula-box{background:#fff9df;border:1px solid #fef08a;padding:7px 12px;border-radius:6px;font-size:12px;color:#854d0e;font-weight:600}
.sim-ws-body{display:grid;grid-template-columns:360px 1fr;min-height:480px}
@media(max-width:900px){.sim-ws-body{grid-template-columns:1fr}}
.sim-controls-panel{padding:24px 20px;border-right:1px solid var(--line);background:#fafbfc}
.sim-controls-title{font-size:13px;font-weight:700;color:var(--navy);margin-bottom:14px;display:flex;justify-content:space-between}
.sim-form-group{margin-bottom:14px}
.sim-form-group label{display:block;font-size:12px;font-weight:600;color:#334155;margin-bottom:4px}
.sim-form-group input{width:100%;padding:9px 10px;border:1px solid #cbd5e1;border-radius:6px;font-size:13px;box-sizing:border-box}
.sim-run-btn{width:100%;padding:12px;background:var(--navy);color:#fff;border:0;border-radius:7px;font-size:14px;font-weight:700;cursor:pointer;margin-top:8px;transition:background .2s}
.sim-run-btn:hover{background:#162a4a}
.sim-results-panel{padding:24px;display:flex;flex-direction:column;gap:20px}
.sim-metrics-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.sim-metric-card{border:1px solid var(--line);border-radius:10px;padding:16px;background:#fff}
.sim-metric-card.highlight{background:linear-gradient(135deg,#0a1931,#162a4a);color:#fff;border-color:#162a4a}
.sim-metric-label{font-size:12px;color:var(--muted);margin-bottom:4px}
.sim-metric-card.highlight .sim-metric-label{color:#cbd5e1}
.sim-metric-val{font-size:22px;font-weight:800;letter-spacing:-.5px}
.sim-metric-card.highlight .sim-metric-val{color:var(--gold)}
.sim-insight-box{background:#f0fdf4;border:1px solid #bbf7d0;border-left:4px solid #22c55e;border-radius:8px;padding:14px 18px}@media(max-width:1000px){.layout{grid-template-columns:290px minmax(0,1fr)}.panel{padding:18px}.result-heading{align-items:flex-start;flex-direction:column}.cards{grid-template-columns:1fr}}@media(max-width:700px){main{padding:30px 16px}header{padding:18px 16px;font-size:11px}.layout{grid-template-columns:1fr}.cards{grid-template-columns:1fr 1fr;gap:10px}.card{padding:15px}.explain-grid{grid-template-columns:1fr;gap:16px}.empty{min-height:250px}.result-heading{flex-direction:row;align-items:center}.pill{font-size:10px}h2{font-size:18px}.fields label{font-size:13px}}

/* 10대 시뮬레이터 단계별 난이도 확장 바 */
.sim-diff-panel {
  background: #f8fafc;
  border-bottom: 1px solid var(--border, #e2e8f0);
  padding: 16px 20px;
}
.sim-diff-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}
.sim-diff-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
@media (max-width: 820px) {
  .sim-diff-tabs { grid-template-columns: repeat(2, 1fr); }
}
.sim-diff-btn {
  padding: 10px 12px;
  background: white;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 700;
  color: #334155;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.sim-diff-btn:hover {
  border-color: #2563eb;
  color: #1e3a8a;
  background: #f0fdf4;
}
.sim-diff-btn.is-active {
  background: linear-gradient(135deg, #0a1931, #1e3a8a);
  border-color: #1e3a8a;
  color: white;
  box-shadow: 0 4px 12px rgba(10, 25, 49, 0.25);
}
.sim-diff-btn.is-active small {
  color: #93c5fd;
}
.sim-diff-btn small {
  font-size: 11px;
  font-weight: 400;
  color: #64748b;
}