/* Layout: 칠판색 상단 띠 + 업무 화면. 시험지 미리보기만 흰 A4 종이로 둔다. */
:root{
  --bg:#F2F4F1;--surface:#FFFFFF;--sunk:#E8ECE8;--ink:#1B2420;--muted:#65716B;--line:#D9E0DB;
  --accent:#2C5B4B;--accent-ink:#FFFFFF;--chalk:#E3EDE7;
  --ok:#2E7A4D;--ok-bg:#E2F1E7;--warn:#A86A12;--warn-bg:#F8EDD8;--bad:#B3372F;--bad-bg:#F7E1DF;--info:#35679C;--info-bg:#E0EAF4;
  --f-display:"Gowun Batang","Nanum Myeongjo",serif;
  --f-body:"IBM Plex Sans KR","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",monospace;
  --f-exam:"Noto Serif KR","Noto Serif CJK KR","Batang","AppleMyungjo",serif;
  --r:8px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#111614;--surface:#18201C;--sunk:#1F2925;--ink:#E4EBE7;--muted:#92A099;--line:#2B3530;
  --accent:#7DB6A0;--accent-ink:#0D1411;--chalk:#1F3029;
  --ok:#6CC08E;--ok-bg:#183326;--warn:#E2B25A;--warn-bg:#33291A;--bad:#EA7E74;--bad-bg:#3A1F1C;--info:#86AEDB;--info-bg:#1B2838;
  color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#111614;--surface:#18201C;--sunk:#1F2925;--ink:#E4EBE7;--muted:#92A099;--line:#2B3530;
  --accent:#7DB6A0;--accent-ink:#0D1411;--chalk:#1F3029;
  --ok:#6CC08E;--ok-bg:#183326;--warn:#E2B25A;--warn-bg:#33291A;--bad:#EA7E74;--bad-bg:#3A1F1C;--info:#86AEDB;--info-bg:#1B2838;
  color-scheme:dark}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0}
img{max-width:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:15px;line-height:1.55}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

.top{background:var(--accent);color:var(--accent-ink);display:flex;flex-wrap:wrap;align-items:center;gap:8px 22px;padding-block:10px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.brand{display:flex;flex-direction:column}
.brand small{font-size:11px;letter-spacing:.08em;opacity:.75}
.brand b{font-family:var(--f-display);font-size:19px;line-height:1.2}
.nav{display:flex;gap:2px;overflow-x:auto}
.nav a{color:inherit;text-decoration:none;padding:7px 12px;border-radius:6px;opacity:.82;font-weight:500;white-space:nowrap;display:flex;gap:6px;align-items:center}
.nav a:hover{opacity:1;background:color-mix(in srgb,var(--accent-ink) 10%,transparent)}
.nav a[aria-current="page"]{opacity:1;background:color-mix(in srgb,var(--accent-ink) 16%,transparent)}
.nav .cnt{font-family:var(--f-mono);font-size:11.5px;background:color-mix(in srgb,var(--accent-ink) 20%,transparent);padding:0 6px;border-radius:99px}
.who{margin-left:auto;font-size:12.5px;display:flex;gap:10px;align-items:center;opacity:.9}
.who button{background:none;border:0;color:inherit;padding:0;cursor:pointer;text-decoration:underline;font-size:12px}

main{padding-block:20px 60px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));max-width:1500px;margin-inline:auto;display:flex;flex-direction:column;gap:16px}
.head{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;justify-content:space-between}
.head h1{font-family:var(--f-display);font-size:25px;margin:0;line-height:1.2;text-wrap:balance}
.head p{margin:2px 0 0;color:var(--muted)}
.tools{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.btn{border:1px solid var(--line);background:var(--surface);padding:8px 14px;border-radius:7px;cursor:pointer;font-weight:500;white-space:nowrap}
a.btn{color:inherit;text-decoration:none}
.btn:hover{border-color:var(--muted)}
.btn.pri{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.btn.pri:hover{filter:brightness(1.08)}
.btn.sm{padding:5px 10px;font-size:13.5px}
.btn.ghost{background:transparent;border-color:transparent;color:var(--muted)}
.btn.ghost:hover{color:var(--ink);border-color:var(--line)}
.btn.danger{color:var(--bad)}
.btn.on{background:var(--chalk);border-color:var(--accent);color:var(--accent)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.field{display:flex;flex-direction:column;gap:4px;min-width:0}
.field>label,.lab{font-size:12px;color:var(--muted);font-weight:500}
input[type=text],input[type=number],input[type=date],input[type=search],input[type=email],input[type=password],select,textarea{border:1px solid var(--line);background:var(--surface);border-radius:6px;padding:7px 10px;min-width:0;width:100%}
textarea{resize:vertical;min-height:96px;line-height:1.6}
.filters{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:12px 14px}
.note{color:var(--muted);font-size:12.5px;margin:0}
.pill{display:inline-block;padding:1px 8px;border-radius:99px;font-size:12px;font-weight:600;line-height:1.6;white-space:nowrap}
.l-하{background:var(--ok-bg);color:var(--ok)}.l-중{background:var(--info-bg);color:var(--info)}.l-상{background:var(--warn-bg);color:var(--warn)}.l-최상{background:var(--bad-bg);color:var(--bad)}
.p-mute{background:var(--sunk);color:var(--muted)}
.chip{font-size:11px;padding:0 6px;border-radius:4px;border:1px dashed var(--muted);color:var(--muted)}
.empty{border:1px dashed var(--line);border-radius:var(--r);padding:28px 22px;display:flex;flex-direction:column;gap:12px;background:var(--surface)}
.empty h3{margin:0;font-size:16px}.empty p{margin:0;color:var(--muted);max-width:62ch}
.skel{color:var(--muted);padding:40px 0}

/* 문제 카드 */
.qlist{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,430px),1fr));gap:12px}
.qc{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:12px 14px;display:flex;flex-direction:column;gap:8px;min-width:0}
.qc.in{border-color:var(--accent)}
.qc .meta{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:12.5px;color:var(--muted)}
.qc .foot{display:flex;gap:6px;justify-content:flex-end;margin-top:auto;flex-wrap:wrap}
.math{overflow-wrap:anywhere;line-height:1.7}
.math .katex{font-size:1.06em}
.qc .math{overflow-x:auto}
.qopts{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:2px 12px;font-size:14px}
.qopts .ans{color:var(--accent);font-weight:700}
.box{border:1px solid currentColor;padding:6px 10px 6px;margin:6px 0;position:relative}
.box>b{display:block;text-align:center;font-weight:400;font-size:.92em;margin-bottom:2px}
.qfig{max-height:150px;object-fit:contain;display:block}

/* 시험지 화면 */
.build{display:grid;grid-template-columns:minmax(0,430px) minmax(0,1fr);gap:16px;align-items:start}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);min-width:0}
.panel>h2{font-size:13.5px;margin:0;padding:11px 14px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:8px}
.panel>h2 span{color:var(--muted);font-weight:400;font-size:12px}
.panel .body{padding:12px 14px;display:flex;flex-direction:column;gap:10px}
.side{display:flex;flex-direction:column;gap:12px}
.fg{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.fg .full{grid-column:1/-1}
.ol{list-style:none;margin:0;padding:0;max-height:430px;overflow-y:auto}
.ol li{display:grid;grid-template-columns:26px minmax(0,1fr) 58px auto;gap:6px;align-items:center;padding:6px 14px;border-top:1px solid var(--line);font-size:13.5px}
.ol li:first-child{border-top:0}
.ol .t{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ol .n{font-family:var(--f-mono);color:var(--muted);font-size:12.5px}
.ol input{padding:3px 6px;text-align:right;font-family:var(--f-mono);font-size:13px}
.ol .mv{display:flex}
.ol .mv button{border:0;background:none;cursor:pointer;color:var(--muted);padding:2px 5px;border-radius:4px}
.ol .mv button:hover{background:var(--sunk);color:var(--ink)}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:6px;overflow:hidden}
.seg button{border:0;background:var(--surface);padding:7px 13px;cursor:pointer;border-left:1px solid var(--line);font-size:14px}
.seg button:first-child{border-left:0}
.seg button[aria-pressed="true"]{background:var(--accent);color:var(--accent-ink);font-weight:600}
.pv-bar{display:flex;flex-wrap:wrap;gap:8px;justify-content:space-between;align-items:center;margin-bottom:10px}
.pv{background:var(--sunk);border-radius:var(--r);padding:14px;overflow:hidden}
#sheets{display:flex;flex-direction:column;gap:14px;align-items:center;zoom:var(--z,1)}

/* A4 종이: 화면 테마와 상관없이 흰 종이에 검은 글씨 */
.sheet{--paper:#FFFFFF;--pink:#141414;--pgrey:#555555;--brand:#CB1333;width:210mm;height:297mm;background:var(--paper);color:var(--pink);padding:11mm 13mm 8mm;display:flex;flex-direction:column;overflow:hidden;font-family:var(--f-exam);font-size:var(--qsize,10.5pt);line-height:1.62;box-shadow:0 2px 10px color-mix(in srgb,#000 18%,transparent);color-scheme:light;flex:none}
.s-head{flex:none;margin-bottom:4.5mm}
.s-mast{display:flex;align-items:center;gap:2.6mm;padding-bottom:1.8mm;border-bottom:1.8pt solid var(--brand);position:relative}
.s-mast::after{content:"";position:absolute;left:0;right:0;bottom:-1.2mm;border-bottom:.5pt solid var(--brand)}
.s-logo{height:10.5mm;width:auto;display:block;flex:none}
.s-name{font-family:var(--f-display);font-weight:700;font-size:17pt;letter-spacing:.08em;line-height:1;color:var(--pink)}
.s-meta{margin-left:auto;font-family:var(--f-body);font-size:9pt;color:var(--pgrey);align-self:flex-end;white-space:nowrap}
.s-meta b{color:var(--brand);font-weight:700}
.s-title{font-size:21pt;font-weight:700;text-align:center;line-height:1.25;margin:5mm 0 3.5mm;letter-spacing:.03em;text-wrap:balance}
.s-title small{display:block;font-size:11pt;font-weight:400;letter-spacing:.3em;color:var(--brand);margin-top:1mm}
.s-info{display:flex;border-top:1.4pt solid var(--pink);border-bottom:.6pt solid var(--pink);font-size:9.5pt;font-family:var(--f-body)}
.s-info>div{flex:1;padding:1.6mm 2.5mm;border-left:.5pt solid #999;white-space:nowrap;display:flex;gap:2mm;justify-content:space-between;min-width:0}
.s-info>div:first-child{border-left:0}
.s-info .w{flex:1.7}
.s-info span{color:var(--pgrey)}
.s-run{flex:none;display:flex;align-items:center;gap:1.8mm;padding-bottom:1.5mm;margin-bottom:4mm;border-bottom:.9pt solid var(--brand);font-size:9pt;font-family:var(--f-body)}
.s-run .s-logo{height:5.5mm}
.s-run b{font-family:var(--f-display);font-size:10.5pt;letter-spacing:.06em}
.s-run span{margin-left:auto;color:var(--pgrey)}
.s-cols{flex:1 1 0;min-height:0;display:flex;gap:9mm;position:relative}
.s-cols.c2::before{content:"";position:absolute;left:50%;top:0;bottom:0;border-left:.6pt solid #888}
.s-col{flex:1 1 0;min-width:0;display:flex;flex-direction:column}
.s-col.fill{justify-content:space-between}
.s-foot{flex:none;height:6.5mm;display:grid;grid-template-columns:1fr auto 1fr;gap:4mm;align-items:end;font-size:8.5pt;color:var(--pgrey);font-family:var(--f-body)}
.s-foot b{font-family:var(--f-mono);font-weight:500;color:var(--pink)}
.s-foot span:last-child{text-align:right;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#measure{position:absolute;left:-10000px;top:0;visibility:hidden}
.q{break-inside:avoid}
.q-line{display:flex;gap:1.5mm}
.q-no{flex:none;font-weight:700;min-width:6mm}
.q-b{flex:1;min-width:0}
.q-pt{font-size:.88em;white-space:nowrap}
.q-tag{font-family:var(--f-body);font-size:.8em;border:.6pt solid var(--pink);padding:0 1mm;margin-right:1mm}
.q-fig{display:block;margin:1.5mm auto}
.q .opts{display:grid;gap:.6mm 2mm;margin-top:1.5mm;padding-left:7.5mm}
.q .o{min-width:0}.q .o>span{display:inline-block}
.sheet .katex{font-size:1.05em}
.sheet .box{margin:1.5mm 0}
.sheet .ansbox{font-size:.92em;color:var(--pgrey);margin-top:1.5mm;padding-left:7.5mm}
.k-grid{display:grid;grid-template-columns:repeat(5,1fr);border-left:.6pt solid var(--pink);border-top:.6pt solid var(--pink);font-size:9.5pt}
.k-grid div{border-right:.6pt solid var(--pink);border-bottom:.6pt solid var(--pink);padding:.8mm 1.5mm;min-width:0;overflow-wrap:anywhere}
.k-grid b{margin-right:1.5mm}
.sheetwarn{color:var(--warn);font-size:12.5px}

/* 모달 */
.overlay{position:fixed;inset:0;background:color-mix(in srgb,#000 45%,transparent);display:flex;align-items:flex-start;justify-content:center;padding-block:max(26px,env(safe-area-inset-top,0px)) 26px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));overflow-y:auto;z-index:50}
.modal{background:var(--surface);border-radius:10px;width:100%;max-width:560px;border:1px solid var(--line);box-shadow:0 18px 50px color-mix(in srgb,#000 30%,transparent)}
.modal.wide{max-width:1040px}
.modal header{padding:13px 18px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:8px}
.modal header h2{margin:0;font-size:17px;font-family:var(--f-display)}
.modal .mb{padding:14px 18px;display:flex;flex-direction:column;gap:12px}
.modal footer{padding:11px 18px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap;align-items:center}
.ed{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:16px}
.ed>div{min-width:0;display:flex;flex-direction:column;gap:10px}
.prev{background:#fff;color:#141414;border:1px solid var(--line);border-radius:6px;padding:12px;font-family:var(--f-exam);min-height:200px;color-scheme:light;font-size:14.5px}
.optrow{display:grid;grid-template-columns:auto minmax(0,1fr);gap:6px;align-items:center}
.optrow label{display:flex;gap:4px;align-items:center;font-size:14px;cursor:pointer}
.opts-ed{display:flex;flex-direction:column;gap:5px}
.figbox{border:1px dashed var(--line);border-radius:6px;padding:8px 10px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.figbox img{max-height:90px;background:#fff}
math-field{width:100%;font-size:21px;border:1px solid var(--line);border-radius:6px;padding:8px 10px;background:var(--surface);color:var(--ink);--caret-color:var(--accent);min-height:58px}
.keys{display:flex;flex-wrap:wrap;gap:4px}
.keys button{min-width:42px;border:1px solid var(--line);background:var(--surface);border-radius:5px;padding:4px 7px;cursor:pointer;font-size:14px}
.keys button:hover{border-color:var(--accent);background:var(--chalk)}
.confirm{display:flex;gap:8px;align-items:center;flex-wrap:wrap;color:var(--bad);font-size:13px}
.lvl{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
.checks{display:flex;flex-wrap:wrap;gap:6px;max-height:170px;overflow-y:auto}
.checks label{display:inline-flex;align-items:center;gap:5px;border:1px solid var(--line);border-radius:6px;padding:3px 8px;cursor:pointer;font-size:13px}
.checks input{margin:0}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:12px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:12px 14px;display:flex;flex-direction:column;gap:6px;min-width:0}
.card h3{margin:0;font-size:15px}
.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(20px + env(safe-area-inset-bottom,0px));background:var(--ink);color:var(--bg);padding:9px 16px;border-radius:8px;font-size:13px;z-index:60;max-width:calc(100% - 32px)}
.gate{position:fixed;inset:0;background:var(--bg);display:flex;align-items:center;justify-content:center;padding:24px;z-index:70}
.gate-card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:28px;width:100%;max-width:380px;display:flex;flex-direction:column;gap:14px}
.gate-brand{display:flex;flex-direction:column;gap:2px;color:var(--accent)}
.gate-brand small{font-size:12px;letter-spacing:.08em}
.gate-brand b{font-family:var(--f-display);font-size:26px}
.gate-msg{margin:0;color:var(--bad);font-size:14px}
.errbox{position:fixed;left:12px;right:12px;bottom:12px;z-index:90;background:#B3372F;color:#fff;padding:12px 14px;border-radius:8px;font-size:13px;white-space:pre-wrap}
@media (max-width:1000px){.build{grid-template-columns:minmax(0,1fr)}.ed{grid-template-columns:minmax(0,1fr)}.ol{max-height:none}}
@media (max-width:640px){.who span{display:none}.fg{grid-template-columns:minmax(0,1fr)}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

@page{size:A4;margin:0}
@media print{
  html,body{background:#fff}
  body>*:not(#appRoot){display:none!important}
  .top,.side,.pv-bar,.head,main>.note{display:none!important}
  main{padding:0;margin:0;max-width:none;display:block}
  .build{display:block}.pv{padding:0;background:none;border-radius:0;overflow:visible}
  #sheets{display:block;zoom:1!important}
  .sheet{box-shadow:none;break-after:page;break-inside:avoid;-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .sheet:last-child{break-after:auto}
}