:root{--bg:#f3f5f7;--card:#fff;--line:#d5dbe1;--txt:#20252b;--muted:#6b7280;--blue:#1468d4;--green:#15803d;--red:#c62828;--amber:#8a5a00}
*{box-sizing:border-box} html,body{color-scheme:light;background:var(--bg);color:var(--txt)} body{margin:0;font-family:"Malgun Gothic","Apple SD Gothic Neo",sans-serif}
.wrap{max-width:1260px;margin:0 auto;padding:16px}
.top{position:sticky;top:0;z-index:20;background:rgba(243,245,247,.96);backdrop-filter:blur(8px);display:flex;justify-content:space-between;gap:12px;align-items:center;padding:10px 0}
h1{font-size:21px;margin:0} .timer{background:#fff;border:1px solid var(--line);border-radius:8px;padding:8px 11px;font-weight:800;white-space:nowrap}
.card{background:#fff;border:1px solid var(--line);border-radius:11px;padding:14px}
.badge{display:inline-block;padding:4px 9px;border-radius:999px;background:#eef4ff;color:#1d4ed8;font-size:12px;font-weight:800;margin-right:6px}
.badge.type{background:#eef7ef;color:#14723a}
.problem{margin-top:10px} .problem img{display:block;max-width:100%;height:auto;margin:0 auto 10px;background:#fff}
.problem.multi img{border-bottom:1px solid #eee;padding-bottom:10px}
h3{font-size:17px;margin:14px 0 7px}
.toolbar{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:7px}
button{border:1px solid #aeb7c1;background:#fff;border-radius:7px;padding:8px 11px;font-weight:700;cursor:pointer}
button:hover{background:#f4f7fb} button.primary{background:var(--blue);border-color:var(--blue);color:#fff}
button.good{background:#eaf7ee;color:#166534} button.bad{background:#fdecec;color:#991b1b}
.memo{min-height:145px;border:1px solid #aeb7c1;border-radius:7px;padding:10px;font-size:19px;line-height:1.9;outline:none;background:#fff}
.frac{display:inline-grid;grid-template-rows:auto auto;vertical-align:middle;text-align:center;min-width:44px;margin:0 4px}
.frac>.num{border-bottom:2px solid #222;padding:1px 6px;min-height:22px} .frac>.den{padding:1px 6px;min-height:22px}
.solution-step{margin:7px 0;line-height:1.9}
.solution-heading{font-weight:800;margin:13px 0 5px;color:#172033}
.solution-frac{display:inline-flex;flex-direction:column;align-items:stretch;justify-content:center;vertical-align:middle;text-align:center;line-height:1.15;min-width:34px;margin:0 4px;white-space:nowrap}
.solution-frac>.solution-num{padding:0 6px 3px;border-bottom:1.7px solid #172033}
.solution-frac>.solution-den{padding:3px 6px 0}
.solution-sqrt{white-space:nowrap}
.solution-root{display:inline-flex;align-items:flex-start;vertical-align:-0.22em;white-space:nowrap;margin:0 .08em}
.solution-root-symbol{font-family:"Times New Roman",serif;font-size:1.52em;line-height:.92;transform:scaleX(.92);margin-right:-.08em}
.solution-radicand{display:inline-block;border-top:1.7px solid currentColor;padding:.08em .12em 0 .13em;line-height:1.18;min-height:1.05em}
.solution-formula-box{margin:8px 0 14px;padding:12px 14px;border:1px solid #cbd7e3;border-radius:9px;background:#f5f8fb}
.solution-formula-box .solution-step{margin:5px 0;font-size:1.02em}
.solution-calc-box{margin:8px 0 14px;padding:2px 0 4px}
.solution-final-box{margin:9px 0 4px;padding:11px 14px;border:2px solid #26384d;border-radius:9px;background:#fff;font-weight:800}
.solution-final-row+.solution-final-row{margin-top:7px}
.solution-symbol-box{margin:8px 0 14px;padding:10px 14px;border:1px solid #d7e0e9;border-radius:9px;background:#fff}
.solution-symbol-row{display:grid;grid-template-columns:minmax(90px,auto) 1fr;gap:10px;align-items:baseline;padding:5px 0}
.solution-symbol-row+.solution-symbol-row{border-top:1px dashed #dfe5eb}
.solution-symbol-term{font-family:Cambria,"Times New Roman",serif;font-size:1.05em;font-weight:800;white-space:nowrap}
.solution-symbol-desc{line-height:1.65;color:#26384d}
.solution-derivation-note{margin:0 0 9px;padding:9px 12px;border-left:4px solid #2f86e8;border-radius:0 7px 7px 0;background:#eef5fd;color:#26384d;line-height:1.65}
@media(max-width:560px){.solution-symbol-row{grid-template-columns:1fr;gap:1px}.solution-symbol-term{white-space:normal}}
.grading-rule-table{width:100%;border-collapse:collapse;margin:10px 0 16px;font-size:14px}
.grading-rule-table th,.grading-rule-table td{border:1px solid #b9c4cf;padding:9px 10px;text-align:left;vertical-align:top}
.grading-rule-table th{background:#eef3f7;font-weight:800}
.grading-warning{margin-top:15px;padding:12px 14px;border-left:4px solid #b44a3b;background:#fff5f3;line-height:1.7}
.math-exp{font-size:.7em;vertical-align:super;font-weight:700} .inline-answer{font-weight:800;margin-left:8px;display:inline-block !important;white-space:nowrap;vertical-align:middle}.calc-line{display:flex;align-items:center;flex-wrap:wrap;gap:6px;min-height:40px}.calc-line .inline-answer{margin-left:6px}
.answer-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px} .ordered-answer-list .ans,.ordered-answer-list .desc{margin-top:10px} .ans label,.desc label{display:block;font-weight:800;margin-bottom:5px}
input.answer,textarea{width:100%;border:1px solid #aeb7c1;border-radius:7px;padding:10px;font-size:16px;background:#fff;color:#222}
textarea{min-height:92px;resize:vertical;line-height:1.55} .desc{margin-top:10px}
.feedback{display:none;margin-top:12px;border-radius:8px;padding:12px;line-height:1.6} .feedback.show{display:block}
.feedback.ok{background:#eaf7ee;color:#166534} .feedback.warn{background:#fff8df;color:#6b4b00} .feedback.bad{background:#fdecec;color:#991b1b}
.actions{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap;margin-top:14px}
.hint{font-size:12px;color:var(--muted);line-height:1.5;margin-top:6px}
.chartbox{margin-top:12px;border:1px solid var(--line);border-radius:9px;padding:9px;background:#fafafa}
.chartviewport{overflow:auto;max-height:680px;border:1px solid #cfd5dc;background:white;text-align:center}
.chartviewport img{transform-origin:top left;display:block;margin:0 auto}
.duct-chart .chartviewport{max-height:none;overflow:auto;padding:8px}
.duct-chart #chartstage{min-width:0}
.zoomrow{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:7px}
.drawbox{margin-top:12px} .drawtools{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:7px}
.drawstage{position:relative;overflow:auto;border:1px solid #9ea7b0;background:#fff;max-height:720px}
.drawstage .bg{display:block;width:100%;height:auto;pointer-events:none;user-select:none}
.drawstage svg{position:absolute;inset:0;width:100%;height:100%;touch-action:none}
.drawtools button.active{
  border:2px solid #1468d4 !important;
  box-shadow:0 0 0 2px rgba(20,104,212,.16);
  background:#eaf2ff !important;
  color:#0f4fa8;
}
.drawtools button[data-tool="erase"].active{
  border-color:#c62828 !important;
  box-shadow:0 0 0 2px rgba(198,40,40,.14);
  background:#fff0f0 !important;
  color:#991b1b;
}
.drawtools button[data-tool="select"].active{
  border-color:#7c3aed !important;
  box-shadow:0 0 0 2px rgba(124,58,237,.14);
  background:#f5f0ff !important;
  color:#5b21b6;
}
.manual-review{margin-top:9px;border:1px dashed #c9a227;background:#fffbea;border-radius:8px;padding:10px;color:#333}
.result{display:none;margin-top:14px;border:2px solid var(--blue);border-radius:10px;padding:16px;background:#f8fbff} .result.show{display:block}
.score{font-size:29px;font-weight:900;color:var(--blue)} table{width:100%;border-collapse:collapse;margin-top:12px} th,td{border:1px solid #d6dde4;padding:7px;text-align:center} th{background:#f3f6f9}
@media(max-width:800px){.answer-grid{grid-template-columns:1fr}h1{font-size:17px}.top{align-items:flex-start}}

/* Multi-image layout */
.problem.multi{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:12px;
  align-items:start;
}
.problem.multi .problem-img-wrap{
  border:1px solid #d8dde3;
  border-radius:8px;
  background:#fff;
  overflow:hidden;
}
.problem.multi .problem-img-wrap img{
  width:100%;
  height:auto;
  margin:0;
  cursor:zoom-in;
}
.problem:not(.multi) .problem-img-wrap img{
  cursor:zoom-in;
}
@media(max-width:800px){
  .problem.multi{grid-template-columns:1fr}
}

/* 모의고사 4 - 13번: 설명 왼쪽, P-h 선도 오른쪽 배치 */
.problem.variant-problem.mock4-q13-side-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(280px,380px);
  gap:22px;
  align-items:start;
}
.problem.mock4-q13-side-layout .problem-img-wrap{
  width:100%;
  max-width:380px;
  justify-self:end;
  margin-top:8px;
}
.problem.mock4-q13-side-layout .problem-img-wrap img{
  width:100%;
  height:auto;
  margin:0;
}
@media(max-width:900px){
  .problem.variant-problem.mock4-q13-side-layout{grid-template-columns:1fr}
  .problem.mock4-q13-side-layout .problem-img-wrap{
    max-width:460px;
    justify-self:center;
    margin-top:0;
  }
}

/* Problem annotation overlay */
.problem-img-wrap{
  position:relative;
  display:block;
  max-width:100%;
}
.problem-img-wrap img{
  display:block;
  max-width:100%;
  height:auto;
  user-select:none;
  -webkit-user-drag:none;
}
.problem-note-svg{
  position:absolute;
  left:0;
  top:0;
  width:100%;
  height:100%;
  touch-action:none;
  cursor:crosshair;
  pointer-events:auto;
  display:block;
}

/* 시험용 선도 작도 레이어를 선도 이미지 위에 확실하게 배치한다. */
#work #chartstage{position:relative;isolation:isolate}
#work #chartstage>#chartimg{position:relative;z-index:1;pointer-events:none;user-select:none;-webkit-user-drag:none}
#work #chartstage>#chartsvg{
  position:absolute!important;
  inset:0!important;
  display:block!important;
  width:100%!important;
  height:100%!important;
  z-index:50!important;
  pointer-events:auto;
  touch-action:none;
}

/* General-question full-area annotation layer */
.problem.general-markup-surface{position:relative}
.problem-markup-svg{
  z-index:30;
  overflow:visible;
}
.problem-markup-svg.is-reading{
  pointer-events:none!important;
  cursor:auto!important;
}

/* Floating tool palette */
#floatingAnnotTools{
  position:fixed;
  left:100px;
  top:var(--exam-tools-top,144px);
  transform:none;
  z-index:999;
  display:flex;
  flex-direction:column;
  gap:2px;
  background:rgba(255,255,255,.97);
  border:1px solid #cfd5dc;
  border-radius:12px;
  padding:6px;
  box-shadow:0 8px 28px rgba(0,0,0,.16);
  max-height:calc(100vh - var(--exam-tools-top,144px) - 10px);
  box-sizing:border-box;
  overflow:hidden;
}
#floatingAnnotTools button{
  width:44px;
  min-height:30px;
  padding:3px 4px;
  font-size:11px;
}
#floatingAnnotTools button.active{
  border:2px solid #1468d4 !important;
  background:#eaf2ff !important;
  box-shadow:0 0 0 2px rgba(20,104,212,.14);
}
#floatingAnnotTools button[data-annot="eraser"].active{
  border-color:#c62828 !important;
  background:#fff0f0 !important;
}
#floatingAnnotTools button[data-annot="select"].active{
  border-color:#7c3aed !important;
  background:#f5f0ff !important;
}
#floatingAnnotTools .tool-label{
  font-size:9px;
  color:#5f6772;
  text-align:center;
  line-height:1.05;
}
#floatingAnnotTools .target-label{
  max-width:64px;
  padding:3px 2px 5px;
  border-bottom:1px solid #e2e6ea;
  color:#334155;
  font-size:11px;
  font-weight:800;
  line-height:1.25;
  text-align:center;
  word-break:keep-all;
}
@media(max-width:900px){
  #floatingAnnotTools{left:92px;transform:scale(.9);transform-origin:left top}
}

/* v138 layout preview: left writing tools + right sticky calculation memo */
body.has-calc-memo #examTop{
  max-width:none;
  margin-left:164px;
  margin-right:504px;
  padding-left:14px;
  padding-right:14px;
}
.calc-memo-panel{
  position:fixed;
  z-index:120;
  right:18px;
  top:var(--exam-tools-top,144px);
  transform:none;
  width:450px;
  max-height:calc(100vh - 92px);
  display:flex;
  flex-direction:column;
  padding:14px;
  border:1px solid #aeb9c5;
  border-radius:13px;
  background:rgba(255,255,255,.985);
  box-shadow:0 12px 34px rgba(30,41,59,.18);
}
.calc-memo-panel .memo-panel-heading{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  margin-bottom:9px;
}
.calc-memo-panel .memo-panel-heading h3{margin:0;font-size:18px}
.calc-memo-panel .memo-sticky-label{
  padding:4px 8px;
  border-radius:999px;
  background:#eef4ff;
  color:#1859a9;
  font-size:11px;
  font-weight:800;
  white-space:nowrap;
}
.calc-memo-panel .toolbar{flex:0 0 auto;margin-bottom:8px}
.calc-memo-panel .toolbar button{padding:7px 9px}
.calc-memo-panel .hint{flex:0 0 auto;margin:0 0 8px;font-size:11px}
.calc-memo-panel .memo{
  flex:1 1 auto;
  min-height:280px;
  height:41vh;
  max-height:433px;
  font-size:16px;
  overflow:auto;
  background:#fffefb;
  box-shadow:inset 0 1px 3px rgba(15,23,42,.05);
}
@media(max-width:1380px){
  body.has-calc-memo #examTop{margin-left:156px;margin-right:450px}
  .calc-memo-panel{right:12px;width:405px}
  .calc-memo-panel .memo{font-size:16px}
}
@media(max-width:1050px){
  body.has-calc-memo #examTop{margin:0 auto;padding-left:164px;padding-right:12px;max-width:100%}
  .calc-memo-panel{
    position:relative;
    right:auto;
    top:auto;
    transform:none;
    width:100%;
    max-height:none;
    margin:10px 0 16px;
    box-shadow:0 5px 18px rgba(30,41,59,.10);
  }
  .calc-memo-panel .memo{height:280px;min-height:280px;max-height:none}
}
@media(max-width:700px){
  body.has-calc-memo #examTop{padding-left:74px}
  #floatingAnnotTools{top:auto;bottom:8px;left:50%;height:auto!important;transform:translateX(-50%);transform-origin:center;flex-direction:row;max-width:96vw;max-height:none;overflow-x:auto;overflow-y:hidden}
  #floatingAnnotTools .tool-label,#floatingAnnotTools .target-label{display:none}
}

/* Image modal */
#imgModal{
  position:fixed;
  inset:0;
  background:rgba(0,0,0,.78);
  z-index:2000;
  display:none;
  align-items:center;
  justify-content:center;
  padding:24px;
}
#imgModal.show{display:flex}
#imgModal img{
  max-width:96vw;
  max-height:92vh;
  object-fit:contain;
  background:#fff;
  border-radius:8px;
}
#imgModal .close{
  position:absolute;
  top:16px;
  right:20px;
  width:44px;
  height:44px;
  border-radius:50%;
  font-size:24px;
  background:#fff;
  border:none;
  cursor:pointer;
}



.solution-panel{display:none;margin-top:14px;border:1px solid #b8c2cc;border-radius:10px;padding:14px;background:#fbfcfd}
.solution-panel.show{display:block}
.solution-panel h3{margin:0 0 10px;font-size:17px}
.solution-panel .solution-note{white-space:pre-wrap;line-height:1.7}


.solution-images{display:grid;grid-template-columns:1fr;gap:12px;margin-top:12px}
.solution-images img{display:block;max-width:100%;height:auto;margin:0 auto;border:1px solid #d8dde3;border-radius:8px;background:#fff;cursor:zoom-in}


.duct-answer-table{width:100%;border-collapse:collapse;margin:12px 0;font-size:14px}.duct-answer-table th,.duct-answer-table td{border:1px solid #b9c0c8;padding:7px;text-align:center}.duct-answer-table th{background:#f4f6f8}.duct-answer-table input{width:100%;min-width:65px;box-sizing:border-box;padding:7px;text-align:center}.duct-pressure-answer{margin:14px 0;display:flex;gap:8px;align-items:center;flex-wrap:wrap}.duct-pressure-answer input{width:180px;padding:8px}.duct-ok{background:#eefaf1}.duct-bad{background:#fff0f0}


#questionNavigator{
  position:fixed;
  left:12px;
  top:var(--exam-tools-top,144px);
  transform:none;
  z-index:998;
  width:76px;
  max-height:calc(100vh - var(--exam-tools-top,144px) - 10px);
  overflow-y:auto;
  padding:8px 7px;
  border:1px solid #cfd5dc;
  border-radius:12px;
  background:rgba(255,255,255,.97);
  box-shadow:0 8px 28px rgba(0,0,0,.14);
}
#questionNavigator .nav-title{
  margin:0 0 7px;
  padding-bottom:7px;
  border-bottom:1px solid #e2e6ea;
  color:#334155;
  font-size:11px;
  font-weight:900;
  text-align:center;
}
#questionNavList{display:flex;flex-direction:column;gap:4px}
#questionNavList button{
  display:grid;
  grid-template-columns:1fr 18px;
  align-items:center;
  width:100%;
  min-height:30px;
  padding:4px 5px;
  border:1px solid transparent;
  border-radius:7px;
  color:#374151;
  background:#f7f8fa;
  font-size:12px;
  font-weight:800;
}
#questionNavList button:hover{border-color:#aeb7c1;background:#eef4ff}
#questionNavList button.current{
  border:2px solid var(--blue);
  padding:3px 4px;
  background:#eaf2ff;
  color:#0f4fa8;
  box-shadow:0 0 0 2px rgba(20,104,212,.12);
}
#questionNavList .nav-status{font-size:15px;font-weight:900;line-height:1}
#questionNavList .ungraded .nav-status{color:#9ca3af}
#questionNavList .correct .nav-status{color:var(--green)}
#questionNavList .wrong .nav-status{color:var(--red)}
#questionNavList .partial .nav-status{color:#d28a00}
@media(max-width:1450px){.wrap{padding-left:96px}}
@media(max-width:700px){
  #questionNavigator{left:5px;width:64px;padding:6px 5px}
  #questionNavigator .nav-title{font-size:10px}
  #questionNavList button{grid-template-columns:1fr 15px;min-height:27px;padding:3px;font-size:11px}
  #questionNavList button.current{padding:2px}
  #questionNavList .nav-status{font-size:13px}
  .wrap{padding-left:74px;padding-right:8px}
}


:root{--site-header-height:92px;--site-blue:#2f86e8;--site-navy:#111827}
.site-header{position:sticky;top:0;z-index:1500;height:var(--site-header-height);border-bottom:1px solid #e6e9ed;background:#fff}
.site-header-inner{display:flex;align-items:center;justify-content:space-between;width:min(1180px,calc(100% - 48px));height:100%;margin:0 auto}
.site-brand{display:inline-flex;align-items:center;gap:12px;color:#202124;text-decoration:none;white-space:nowrap}
.site-brand-mark{display:grid;place-items:center;width:44px;height:44px;border-radius:13px;background:linear-gradient(145deg,#45a2f3,#2678df);box-shadow:0 5px 14px rgba(47,134,232,.18)}
.site-brand-mark svg{display:block;width:28px;height:28px}
.site-brand-name{font-size:29px;font-weight:900;letter-spacing:-1.4px}
.site-brand-sub{display:block;margin-top:2px;color:#788391;font-size:10px;font-weight:700;letter-spacing:.02em}
.site-menu{display:flex;align-items:center;gap:42px;height:100%}
.site-menu a{position:relative;display:flex;align-items:center;height:100%;color:#111827;text-decoration:none;font-size:17px;font-weight:800;letter-spacing:-.45px;white-space:nowrap}
.site-menu a::after{content:'';position:absolute;left:50%;bottom:18px;width:0;height:3px;border-radius:99px;background:var(--site-blue);transform:translateX(-50%);transition:width .18s ease}
.site-menu a:hover,.site-menu a:focus-visible{color:#1768bd}
.site-menu a:hover::after,.site-menu a:focus-visible::after,.site-menu a.active::after{width:100%}
.site-menu a.active{color:#1768bd}
.menu-toggle{display:none;width:42px;height:42px;padding:0;border:1px solid #d7dde5;border-radius:9px;background:#fff;color:#1f2937;font-size:22px;line-height:1}
.menu-notice{position:fixed;left:50%;top:calc(var(--site-header-height) + 14px);z-index:1600;padding:10px 16px;border-radius:8px;background:rgba(17,24,39,.93);color:#fff;font-size:13px;font-weight:700;opacity:0;pointer-events:none;transform:translate(-50%,-8px);transition:opacity .18s ease,transform .18s ease}
.menu-notice.show{opacity:1;transform:translate(-50%,0)}
.top{top:var(--site-header-height)}
@media(max-width:960px){
  :root{--site-header-height:72px}
  .site-header-inner{width:min(100% - 28px,1180px)}
  .site-brand-mark{width:40px;height:40px;border-radius:11px}
  .site-brand-name{font-size:24px}.site-brand-sub{display:none}
  .menu-toggle{display:block}
  .site-menu{position:absolute;left:14px;right:14px;top:calc(100% + 8px);display:none;height:auto;padding:8px;border:1px solid #dfe4ea;border-radius:12px;background:#fff;box-shadow:0 12px 28px rgba(15,23,42,.14)}
  .site-menu.open{display:grid;grid-template-columns:1fr 1fr}
  .site-menu a{height:auto;min-height:46px;padding:10px 12px;border-radius:8px;font-size:15px}
  .site-menu a::after{display:none}
  .site-menu a:hover,.site-menu a:focus-visible,.site-menu a.active{background:#edf5ff}
}
@media(max-width:520px){.site-menu.open{grid-template-columns:1fr}.site-brand-name{font-size:22px}}


.site-footer{margin-top:30px;border-top:1px solid #dfe4ea;background:#fff;color:#5b6470}
.site-footer-inner{width:min(1180px,calc(100% - 48px));margin:0 auto;padding:25px 0 28px;text-align:center}
.site-footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:5px 0;margin-bottom:13px}
.site-footer-links a{display:inline-flex;align-items:center;color:#3f4854;text-decoration:none;font-size:13px;font-weight:800}
.site-footer-links a:hover,.site-footer-links a:focus-visible{color:#1768bd;text-decoration:underline;text-underline-offset:3px}
.site-footer-links a:not(:last-child)::after{content:'';display:block;width:1px;height:12px;margin:0 14px;background:#d7dce2}
.site-footer-copy{margin:0;font-size:12px;line-height:1.65}
.info-page{position:fixed;top:var(--site-header-height);right:0;bottom:0;left:0;z-index:1450;display:none;overflow-y:auto;background:#f4f6f8}
.info-page.show{display:block}
.info-page-inner{width:min(900px,calc(100% - 40px));margin:32px auto 64px;padding:38px 44px 46px;border:1px solid #dfe4ea;border-radius:14px;background:#fff;box-shadow:0 10px 30px rgba(15,23,42,.06)}
.info-back{display:inline-flex;align-items:center;gap:7px;margin:0 0 25px;padding:8px 11px;border:1px solid #cfd6df;border-radius:8px;background:#fff;color:#314154;font-size:14px;font-weight:800;text-decoration:none}
.info-back:hover,.info-back:focus-visible{border-color:#8bb9ed;background:#f2f7fd;color:#1768bd}
.info-page h1{margin:0 0 10px;color:#182231;font-size:30px;letter-spacing:-1px}
.info-lead{margin:0 0 29px;padding-bottom:22px;border-bottom:1px solid #e3e7eb;color:#647080;line-height:1.7}
.info-page h2{margin:29px 0 10px;color:#1f2c3c;font-size:19px}
.info-page p,.info-page li{color:#394656;font-size:15px;line-height:1.85}
.info-page p{margin:8px 0}.info-page ul{margin:8px 0;padding-left:24px}
.info-page .policy-note{margin:22px 0 0;padding:15px 17px;border-left:4px solid #2f86e8;border-radius:0 8px 8px 0;background:#f0f7ff;color:#2d4664}
.info-page .placeholder{display:inline-block;padding:2px 7px;border-radius:5px;background:#fff2c7;color:#765200;font-weight:800}
.info-page .feature-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:16px 0;padding:0;list-style:none}
.info-page .feature-list li{padding:12px 14px;border:1px solid #dce4ed;border-radius:9px;background:#f9fbfd;font-weight:700}
body.info-page-open{overflow:hidden}
@media(max-width:720px){
  .site-footer-inner{width:min(100% - 28px,1180px)}
  .site-footer-links a:not(:last-child)::after{margin:0 9px}
  .info-page-inner{width:min(100% - 24px,900px);margin:18px auto 36px;padding:25px 20px 32px}
  .info-page h1{font-size:25px}.info-page .feature-list{grid-template-columns:1fr}
}


:root{--home-navy:#123b68;--home-blue:#287fd7;--home-soft:#eef6ff}
body.view-home .wrap,body.view-home #questionNavigator,body.view-home #floatingAnnotTools,
body.view-practice .wrap,body.view-practice #questionNavigator,body.view-practice #floatingAnnotTools{display:none!important}
body.view-exam .home-page,body.view-exam .practice-page,body.view-practice .home-page{display:none!important}
body.view-home .practice-page{display:none!important}
.site-header-inner{gap:22px}
.site-menu{margin-left:auto;gap:28px}
.site-menu>a,.nav-group>.nav-trigger{position:relative;display:flex;align-items:center;gap:5px;height:100%;padding:0;border:0;border-radius:0;background:transparent;color:#111827;text-decoration:none;font-family:inherit;font-size:16px;font-weight:800;letter-spacing:-.45px;white-space:nowrap}
.site-menu>a::after,.nav-group>.nav-trigger::after{content:'';position:absolute;left:50%;bottom:18px;width:0;height:3px;border-radius:99px;background:var(--site-blue);transform:translateX(-50%);transition:width .18s ease}
.site-menu>a:hover,.site-menu>a:focus-visible,.nav-group>.nav-trigger:hover,.nav-group>.nav-trigger:focus-visible{background:transparent;color:#1768bd}
.site-menu>a:hover::after,.site-menu>a:focus-visible::after,.site-menu>a.active::after,.nav-group>.nav-trigger:hover::after,.nav-group>.nav-trigger:focus-visible::after,.nav-group>.nav-trigger.active::after{width:100%}
.nav-group{position:relative;display:flex;align-items:center;height:100%}
.nav-caret{font-size:11px;transition:transform .18s ease}
.nav-group.open .nav-caret{transform:rotate(180deg)}
.nav-dropdown{position:absolute;top:calc(100% - 12px);left:50%;display:none;width:218px;padding:9px;border:1px solid #dde4ec;border-radius:12px;background:#fff;box-shadow:0 15px 35px rgba(15,35,60,.16);transform:translateX(-50%)}
.nav-group.open .nav-dropdown,.nav-group:hover .nav-dropdown{display:block}
.nav-dropdown a{display:flex;align-items:center;justify-content:space-between;width:100%;height:auto;min-height:42px;padding:9px 11px;border-radius:8px;color:#27364a;text-decoration:none;font-size:14px;font-weight:750;line-height:1.3}
.nav-dropdown a::after{display:none!important}
.nav-dropdown a:hover,.nav-dropdown a:focus-visible{background:#edf5ff;color:#1768bd}
.nav-dropdown small{color:#8a95a3;font-size:10px;font-weight:700}
.home-page{min-height:calc(100vh - var(--site-header-height));background:linear-gradient(180deg,#f6faff 0,#f4f6f8 72%)}
.home-inner{width:min(1180px,calc(100% - 48px));margin:0 auto;padding:34px 0 42px}
.home-main-grid{display:grid;grid-template-columns:minmax(0,1fr);align-items:stretch}
.home-content-stack{display:flex;min-width:0;flex-direction:column;gap:16px}
.home-hero{border:1px solid #dfe6ee;border-radius:16px;background:#fff;box-shadow:0 10px 30px rgba(22,51,84,.06)}
.site-intro-card{padding:20px 22px;border:1px solid #dfe6ee;border-radius:16px;background:#fff;box-shadow:0 10px 30px rgba(22,51,84,.06)}
.site-intro-card h2{margin:0 0 15px;color:#1d2e42;font-size:21px;letter-spacing:-.6px}
.site-intro-horizontal{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(170px,.75fr) minmax(190px,.8fr);gap:22px}
.site-intro-horizontal section{min-width:0}
.site-intro-horizontal section+section{padding-left:20px;border-left:1px solid #e4e9ef}
.site-intro-card h3{margin:0 0 9px;color:#29445f;font-size:15px}
.site-intro-card p{margin:0 0 8px;color:#5b697b;font-size:12.5px;line-height:1.62;word-break:keep-all}
.site-intro-card p:last-child{margin-bottom:0}
.site-intro-card ul{margin:0;padding-left:18px;color:#5b697b;font-size:12.5px;line-height:1.68}
.site-intro-card li+li{margin-top:3px}
.home-hero{padding:29px 30px}
.home-hero-grid{display:grid;grid-template-columns:minmax(230px,.55fr) minmax(0,1.45fr);gap:32px;align-items:center}
.hero-kicker{display:inline-flex;align-items:center;gap:7px;margin-bottom:14px;color:#216ebd;font-size:13px;font-weight:900}
.hero-kicker::before{content:'';width:24px;height:3px;border-radius:99px;background:#2f86e8}
.hero-copy h1{margin:0;color:#172b43;font-size:21px;line-height:1.35;letter-spacing:-.6px;word-break:keep-all}
.hero-copy p{margin:16px 0 0;color:#5b697b;font-size:15px;line-height:1.75;word-break:keep-all}
.demo-video-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.demo-item{min-width:0}
.demo-title{display:block;margin:0 0 8px;color:#29445f;font-size:12px;font-weight:900}
.demo-poster{position:relative;aspect-ratio:16/9;overflow:hidden;border:1px solid #cfd9e4;border-radius:13px;background:#eaf1f7;box-shadow:0 10px 24px rgba(19,55,91,.12)}
.demo-video{display:block;width:100%;height:100%;object-fit:contain;background:#0b1724}
.demo-caption{position:absolute;right:11px;top:11px;left:11px;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:10px;pointer-events:none;color:#fff;font-size:11px;font-weight:800;text-shadow:0 1px 4px rgba(0,0,0,.65)}
.demo-speed{padding:5px 8px;border:1px solid rgba(255,255,255,.5);border-radius:999px;background:rgba(13,38,65,.72);white-space:nowrap}
.feature-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:22px;overflow:hidden;border:1px solid #dfe6ee;border-radius:14px;background:#dfe6ee}
.feature-item{padding:18px 17px;background:#fff}
.feature-item strong{display:block;margin-bottom:5px;color:#21364e;font-size:14px}.feature-item span{color:#6c7988;font-size:12px;line-height:1.5}
.quick-section{margin-top:22px}
.quick-section h2{margin:0 0 12px;color:#20344b;font-size:19px}
.quick-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}
.quick-card{padding:18px;border:1px solid #dfe6ee;border-radius:13px;background:#fff;text-decoration:none}
.quick-card strong{display:block;color:#223a55;font-size:15px}.quick-card span{display:block;margin-top:7px;color:#738090;font-size:12px;line-height:1.5}
.quick-card:hover{border-color:#9fc5ee;box-shadow:0 8px 20px rgba(38,94,153,.08)}
.home-update-section{margin-top:24px}.home-update-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:12px}.home-update-head h2{margin:0;color:#20344b;font-size:19px}.home-update-head a{color:#3179be;font-size:12px;font-weight:800;text-decoration:none}.home-update-list{overflow:hidden;border:1px solid #dfe6ee;border-radius:14px;background:#fff}.home-update-item{display:grid;grid-template-columns:125px minmax(0,1fr);gap:18px;padding:17px 19px}.home-update-item+.home-update-item{border-top:1px solid #e6ebf1}.home-update-version{display:flex;flex-direction:column;gap:5px}.home-update-version strong{color:#216ebd;font-size:15px}.home-update-version time{color:#84909d;font-size:11px}.home-update-content h3{margin:0 0 9px;color:#263d56;font-size:14px}.home-update-change{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1.2fr);align-items:center;gap:12px}.home-update-change span{display:flex;align-items:flex-start;gap:8px;color:#687687;font-size:12px;line-height:1.55}.home-update-change b{flex:0 0 auto;color:#334f6d;font-size:11px}.home-update-change i{color:#4b87c2;font-style:normal;font-weight:900}
.practice-page{min-height:calc(100vh - var(--site-header-height));background:linear-gradient(180deg,#f6faff 0,#f4f6f8 72%)}
.practice-inner{width:min(1040px,calc(100% - 48px));margin:0 auto;padding:38px 0 54px}
.practice-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:22px}
.practice-heading h1{margin:0 0 8px;color:#172b43;font-size:32px;letter-spacing:-1.2px}
.practice-heading p{margin:0;color:#657386;font-size:14px;line-height:1.65}
.practice-back{padding:9px 13px;border:1px solid #cdd9e6;border-radius:9px;background:#fff;color:#365a7e;font-weight:800}
.subject-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-bottom:22px}
.subject-card{min-height:116px;padding:17px;border:1px solid #dfe6ee;border-radius:13px;background:#fff;text-align:left;box-shadow:0 7px 20px rgba(22,51,84,.04)}
.subject-card strong{display:block;margin-bottom:7px;color:#223a55;font-size:16px}.subject-card span{color:#738090;font-size:12px;line-height:1.55}
.subject-card:hover{border-color:#91bce8;background:#f8fbff}
.practice-note{margin-top:13px;color:#7a8795;font-size:11px;line-height:1.55;text-align:center}
@media(max-width:1080px){.site-menu{gap:18px}.home-hero-grid{grid-template-columns:1fr}.site-intro-horizontal{grid-template-columns:1fr 1fr}.site-intro-copy{grid-column:1/-1}.site-intro-horizontal section:nth-child(2){padding-left:0;border-left:0}}
@media(max-width:960px){
  .site-menu{gap:0;margin:0}.site-menu.open{display:grid;grid-template-columns:1fr 1fr;align-items:start;max-height:calc(100vh - 92px);overflow:auto}
  .site-menu>a,.nav-group>.nav-trigger{width:100%;height:auto;min-height:46px;padding:10px 12px;border-radius:8px;font-size:15px;justify-content:space-between}
  .site-menu>a::after,.nav-group>.nav-trigger::after{display:none}
  .site-menu>a:hover,.site-menu>a:focus-visible,.site-menu>a.active,.nav-group>.nav-trigger:hover,.nav-group>.nav-trigger:focus-visible,.nav-group>.nav-trigger.active{background:#edf5ff}
  .nav-group{display:block;height:auto}.nav-dropdown{position:static;display:none;width:auto;padding:4px 7px 8px;border:0;box-shadow:none;transform:none}.nav-group:hover .nav-dropdown{display:none}.nav-group.open .nav-dropdown{display:block}
  .nav-dropdown a{min-height:38px;padding:7px 10px}
  .home-hero{padding:24px}.home-hero-grid{gap:20px}
}
@media(max-width:720px){.home-inner{width:min(100% - 24px,1180px);padding:18px 0 28px}.home-main-grid{grid-template-columns:1fr}.home-content-stack{order:1}.home-hero{padding:21px 18px}.home-hero-grid{grid-template-columns:1fr}.site-intro-card{padding:18px}.site-intro-horizontal{grid-template-columns:1fr;gap:16px}.site-intro-copy{grid-column:auto}.site-intro-horizontal section+section{padding-top:15px;padding-left:0;border-top:1px solid #e4e9ef;border-left:0}.feature-strip{grid-template-columns:1fr 1fr}.quick-cards{grid-template-columns:1fr}.demo-video-grid{grid-template-columns:1fr}.demo-poster{aspect-ratio:16/10}.home-update-item{grid-template-columns:1fr;gap:10px}.home-update-version{flex-direction:row;align-items:center}.home-update-change{grid-template-columns:1fr}.home-update-change i{transform:rotate(90deg);text-align:center}}
@media(max-width:900px){.subject-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:720px){.practice-inner{width:min(100% - 24px,1040px);padding:25px 0 38px}.practice-heading{align-items:flex-start;flex-direction:column}.practice-heading h1{font-size:27px}.subject-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.site-menu.open{grid-template-columns:1fr}.feature-strip{grid-template-columns:1fr}}
@media(max-width:520px){.subject-grid{grid-template-columns:1fr}.practice-back{width:100%}}


.mock5-compare-table{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px}
.mock5-compare-table th,.mock5-compare-table td{border:1px solid #9fa9b5;padding:8px;text-align:center}
.mock5-compare-table th{background:#eef2f6;font-weight:800}
.mock5-compare-table td:first-child{text-align:left;font-weight:700;background:#fafbfc}
.mock5-compare-table input{width:68px;max-width:100%;padding:8px;border:1px solid #aeb7c1;border-radius:6px;text-align:center;font-size:16px}
.mock5-compare-table input.duct-ok{background:#eefaf1;border-color:#70ad7c}
.mock5-compare-table input.duct-bad{background:#fff0f0;border-color:#d98a8a}
.mock5-choice-note{margin:10px 0;padding:10px 12px;border-left:4px solid #5b91c8;background:#f3f8fd;font-weight:700}


body.view-learning .wrap,
body.view-learning #questionNavigator,
body.view-learning #floatingAnnotTools,
body.view-learning .home-page,
body.view-learning .practice-page{display:none!important}
body.view-home .learning-page,
body.view-exam .learning-page,
body.view-practice .learning-page{display:none!important}
.learning-page{min-height:calc(100vh - var(--site-header-height));background:#f4f6f8}
.learning-inner{width:min(1040px,calc(100% - 40px));margin:0 auto;padding:34px 0 60px}
.learning-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-end;margin-bottom:20px}
.learning-head h1{margin:0 0 7px;color:#172b43;font-size:31px;letter-spacing:-1px}
.learning-head p{margin:0;color:#657386;line-height:1.65}
.learning-back{padding:9px 13px;border:1px solid #cdd9e6;border-radius:9px;background:#fff;color:#365a7e}
.learning-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:0 0 18px}
.learning-summary div{padding:15px;border:1px solid #dce4ed;border-radius:11px;background:#fff}
.learning-summary strong{display:block;margin-bottom:5px;color:#203a55}
.learning-summary span{color:#6b7786;font-size:13px;line-height:1.5}
.learn-accordion{display:grid;gap:11px}
.learn-section{overflow:hidden;border:1px solid #d8e0e8;border-radius:12px;background:#fff}
.learn-section summary{display:flex;align-items:center;gap:10px;padding:16px 18px;cursor:pointer;font-size:17px;font-weight:900;color:#20344b;list-style:none}
.learn-section summary::-webkit-details-marker{display:none}
.learn-section summary::before{content:'+';display:grid;place-items:center;width:25px;height:25px;border-radius:50%;background:#edf5ff;color:#1768bd;font-size:18px}
.learn-section[open] summary::before{content:'−'}
.learn-body{padding:0 19px 20px;border-top:1px solid #edf0f3;color:#344154;line-height:1.75}
.learn-body h3{margin:18px 0 8px;color:#1d3047}
.learn-body p{margin:8px 0}
.learn-formula{margin:13px 0;padding:15px;border-left:4px solid #2f86e8;border-radius:0 9px 9px 0;background:#f2f7fd;text-align:center;font-family:Cambria,serif;font-size:20px}
.learn-table{width:100%;border-collapse:collapse;margin:12px 0}
.learn-table th,.learn-table td{border:1px solid #d2dae3;padding:9px;text-align:left}
.learn-table th{background:#f2f5f8}
.exam-tip{margin:13px 0;padding:13px 15px;border:1px solid #f0d890;border-radius:9px;background:#fff9e8;color:#624b12}
.mistake-note{margin:13px 0;padding:13px 15px;border:1px solid #efb8b8;border-radius:9px;background:#fff3f3;color:#7d2424}
.heat-visual{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:15px 0}
.heat-mode{min-height:120px;padding:14px;border:1px solid #cfd8e2;border-radius:10px;background:#fbfcfd;text-align:center}
.heat-mode strong{display:block;margin-bottom:10px;color:#233a54}
.heat-icon{font-size:32px;letter-spacing:3px}
.wall-diagram{display:grid;grid-template-columns:52px 68px 82px 62px 52px;justify-content:center;min-height:170px;margin:18px auto 10px}
.wall-diagram div{display:flex;align-items:center;justify-content:center;border:1px solid #52677e;border-right:0;font-size:12px;writing-mode:vertical-rl}
.wall-diagram div:last-child{border-right:1px solid #52677e}
.wall-diagram .insul{background:repeating-linear-gradient(45deg,#fff,#fff 7px,#e8edf2 7px,#e8edf2 9px)}
.wall-diagram .block{background:repeating-linear-gradient(0deg,#fff,#fff 19px,#d8e0e8 19px,#d8e0e8 21px)}
.memory-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:9px;margin-top:12px}
.memory-grid div{padding:12px;border:1px solid #dbe3eb;border-radius:9px;background:#fafcff;font-weight:750}
@media(max-width:720px){
  .learning-inner{width:min(100% - 24px,1040px);padding:22px 0 42px}
  .learning-head{align-items:flex-start;flex-direction:column}
  .learning-head h1{font-size:27px}
  .learning-summary,.heat-visual,.memory-grid{grid-template-columns:1fr}
  .wall-diagram{grid-template-columns:38px 50px 58px 46px 38px}
}


.learning-topic[hidden]{display:none!important}
.refrig-key-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:14px 0}
.refrig-key-card{padding:14px;border:1px solid #d8e1eb;border-radius:10px;background:#fbfdff}
.refrig-key-card strong{display:block;margin-bottom:6px;color:#203a55}
.refrig-key-card span{display:block;color:#687789;font-size:13px;line-height:1.6}
.refrig-flow{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;margin:15px 0;padding:16px;border:1px solid #d6dee8;border-radius:10px;background:#fff}
.refrig-flow span{padding:9px 13px;border:1px solid #6d7e91;border-radius:8px;background:#fff;font-weight:800}
.refrig-flow b{font-size:19px;color:#52677e}
@media(max-width:720px){.refrig-key-grid{grid-template-columns:1fr}.refrig-flow{justify-content:flex-start}.refrig-flow b{transform:rotate(90deg)}}


.ph-board{margin:14px 0;padding:14px;border:1px solid #cfd8e2;border-radius:11px;background:#fff;overflow-x:auto}
.ph-board svg{display:block;width:min(100%,760px);height:auto;margin:0 auto}
.ph-board text{font-family:"Malgun Gothic","Apple SD Gothic Neo",sans-serif;fill:#26384d}
.ph-legend{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:12px 0}
.ph-legend div{padding:10px;border:1px solid #dbe3eb;border-radius:8px;background:#fafcff;font-size:13px;line-height:1.55}
.cycle-step-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;margin:14px 0}
.cycle-step{padding:12px;border:1px solid #d7e0e9;border-radius:9px;background:#fbfcfd}
.cycle-step strong{display:block;margin-bottom:6px;color:#203a55}
.line-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin:13px 0}
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body.office-mode.view-exam .office-mode-chrome{
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body.office-mode.view-exam #examTop .top{top:131px;padding:6px 10px;border:1px solid #b8c4bc;background:rgba(255,255,255,.97);backdrop-filter:none}
body.office-mode.view-exam #examTitle{font-size:0;font-weight:700;color:#24372b}
body.office-mode.view-exam #examTitle::after{content:'냉방부하 설계조건 검토';font-size:15px}
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body.office-mode.view-exam #examTop>.card{
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body.office-mode.view-exam .variant-sheet{border-color:#9eb5a5;border-radius:0;background:rgba(255,255,255,.96)}
body.office-mode.view-exam .variant-sheet .variant-kicker{border-radius:0;background:#e2f0d9;color:#185c37}
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body.office-mode.view-exam .variant-sheet .conditions h3{background:#e2f0d9;color:#24372b}
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body.office-mode.view-exam .result{border-color:#217346;background:#f6fbf7}
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@media(max-width:760px){.components-role-concept{padding:10px}}


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@media(max-width:760px){.evap-relation-concept{padding:10px}}


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@media(max-width:760px){.shsc-concept{padding:10px}}


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@media(max-width:760px){.enthalpy-concept{padding:10px}}


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@media(max-width:760px){.refrigerant-concept{padding:10px}}


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@media(max-width:760px){.cycle-flow-concept{padding:10px}}


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@media(max-width:760px){.air-terms-concept{padding:10px}}