/* Pretendard (SIL OFL 1.1, fonts/Pretendard-LICENSE.txt) */
@font-face{font-family:"Pretendard";font-weight:45 920;font-style:normal;font-display:swap;src:url("fonts/PretendardVariable.woff2") format("woff2")}
:root{
  --bg:#f3f4f1; --paper:#ffffff; --ink:#1d2125; --muted:#5d656d; --line:#d8dcd5;
  --asphalt:#2b3036; --center:#f2b705;
  --blue:#1d57a3; --blue-bg:#e8eff9; --red:#c3301d; --red-bg:#fbeceb; --yellow-bg:#fff5d6; --yellow-ink:#7a5a00;
  --ok:#1d57a3; --bad:#c3301d; --tag-ink:#fff; --hl:#ffe58a;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#181b1f; --paper:#21252a; --ink:#e8eaec; --muted:#a0a8b0; --line:#353b42;
    --asphalt:#111316; --blue:#7fb0f0; --blue-bg:#1c2a3d; --red:#f08a7c; --red-bg:#3a2220; --yellow-bg:#3a3017; --yellow-ink:#f2cf6b; --tag-ink:#14181c; --hl:#5c4a12;
  }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:"Pretendard","Apple SD Gothic Neo","Noto Sans KR","Malgun Gothic",system-ui,sans-serif;
  font-size:18px;line-height:1.8;word-break:keep-all;overflow-wrap:break-word}
a{color:var(--blue)}
button{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--center);outline-offset:2px}

/* 머리띠: 아스팔트 + 노란 중앙선 진행률 */
.road{position:sticky;top:0;z-index:20;background:var(--asphalt);color:#fff;padding:0 16px;box-shadow:0 1px 0 rgba(0,0,0,.25)}
.road-in{max-width:1100px;margin:0 auto;height:52px;display:flex;align-items:center;gap:12px}
.road h1{font-size:17px;margin:0;font-weight:800;letter-spacing:-.02em;display:flex;align-items:center;gap:10px;white-space:nowrap}
.road .logo{width:28px;height:28px;border-radius:7px;box-shadow:0 0 0 1px rgba(255,255,255,.14)}
.road h1 small{font-weight:600;font-size:12.5px;color:var(--center);border:1px solid rgba(242,183,5,.45);border-radius:999px;padding:2px 9px;letter-spacing:0}
/* 차선: 흰 점선 위로 노란 중앙선이 진행률만큼 깔린다 */
.lane{margin:0 -16px;height:4px;position:relative;
  background:repeating-linear-gradient(90deg,rgba(255,255,255,.22) 0 18px,transparent 18px 34px) 0 50%/100% 2px no-repeat}
.lane i{position:absolute;left:0;height:4px;top:0;width:var(--p,0%);background:var(--center);transition:width .2s}
.tabs-top{display:none;gap:4px;margin-left:auto;align-self:stretch}
.tab{background:none;border:0;color:#aeb5bc;padding:8px 14px;border-radius:8px;cursor:pointer;font-weight:600}
.tab:hover{color:#fff}
.tab[aria-selected=true]{color:#fff}
.tabs-top .tab{border-radius:0;padding:0 14px;font-size:15.5px;box-shadow:inset 0 -3px 0 transparent}
.tabs-top .tab[aria-selected=true]{box-shadow:inset 0 -3px 0 var(--center)}
.tabs-bottom{position:fixed;bottom:0;left:0;right:0;z-index:20;display:flex;background:var(--asphalt);
  padding-bottom:env(safe-area-inset-bottom)}
.tabs-bottom .tab{flex:1;padding:12px 0;border-radius:0;font-size:15px}
.tabs-bottom .tab[aria-selected=true]{box-shadow:inset 0 3px 0 var(--center);background:none}

main{max-width:1100px;margin:0 auto;padding:16px 16px 96px}
section[hidden]{display:none}

/* 정리 */
.layout{display:block}
.toc{display:none}
#tocbtn{margin-left:auto;min-width:0;max-width:60%;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);border-radius:999px;
  color:#e6e9ec;font-size:14px;cursor:pointer;padding:6px 12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#tocbtn[aria-expanded=true]{border-color:var(--center)}
#tocbtn::after{content:" ▾";font-size:12px}
@media (max-width:959px){.road h1 small{display:none}}
body.tocopen .toc{display:block;position:fixed;z-index:30;top:64px;left:12px;right:12px;max-height:70vh;overflow:auto;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:8px 0;box-shadow:0 12px 32px rgba(0,0,0,.25)}
body.tocopen .toc a{display:block;padding:10px 16px;color:var(--ink);text-decoration:none;font-size:16px}
body.tocopen .toc a.on{font-weight:800;box-shadow:inset 4px 0 0 var(--center)}
.doc{max-width:720px;margin:0 auto}
.doc hr{display:none}
.doc h2{font-size:26px;line-height:1.35;margin:64px 0 16px;padding-top:16px;border-top:4px solid var(--ink);scroll-margin-top:72px}
.doc h2:first-child{margin-top:8px}
.doc h3{font-size:21px;line-height:1.4;margin:40px 0 10px;padding-left:12px;border-left:5px solid var(--center);scroll-margin-top:72px}
.doc p{margin:.6em 0}
.doc li{margin:.75em 0}
.doc li::marker{color:var(--muted)}
.doc ul,.doc ol{padding-left:1.3em}
.doc img{max-width:100%;height:auto;border-radius:6px;vertical-align:middle;background:#fff}
.doc>p strong,.doc>ul strong,.doc>ol strong{background:linear-gradient(transparent 58%,var(--hl) 58%);padding:0 1px}
.doc em{color:var(--muted);font-style:normal;font-size:15px}
.tablewrap{overflow-x:auto;margin:12px 0;border:1px solid var(--line);border-radius:8px;background:var(--paper)}
table{border-collapse:collapse;width:100%;font-size:16.5px;line-height:1.6}
th,td{padding:9px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
tr:last-child td{border-bottom:0}
th{background:var(--bg);font-weight:700;white-space:nowrap}
.slowstop td:first-child{white-space:nowrap;font-weight:700}
.slowstop td:nth-child(2):not(:empty){background:var(--yellow-bg)}
.slowstop td:nth-child(3):not(:empty){background:var(--red-bg)}
.slowstop th:nth-child(2){color:var(--yellow-ink)}.slowstop th:nth-child(3){color:var(--red)}
@media (max-width:600px){table{font-size:16px}th,td{padding:8px 9px}}

.box{margin:20px 0;padding:14px 18px;border-radius:8px;border-left:5px solid}
.box p:first-child{margin-top:0}.box p:last-child,.box ul:last-child{margin-bottom:0}
.tag{display:inline-block;font-size:13px;font-weight:800;padding:1px 8px;border-radius:4px;margin-right:8px;vertical-align:2px;color:var(--tag-ink)}
.core{background:var(--blue-bg);border-color:var(--blue)}
.core .tag{background:var(--blue)}
.memo{background:var(--yellow-bg);border-color:var(--center)}
.memo .tag{background:var(--center);color:#2b2200}
.memo strong{color:var(--yellow-ink)}
.trap{background:var(--red-bg);border-color:var(--red)}
.trap .tag{background:var(--red)}
.rules{background:var(--paper);border-color:var(--ink)}
.rules p{margin:.8em 0}

.check{margin:24px 0;border:2px solid var(--blue);border-radius:10px;background:var(--paper);padding:4px 16px 14px}
.check .ct{font-weight:800;color:var(--blue);margin:10px 0 4px}
.check details summary{display:inline-block;cursor:pointer;margin-top:8px;padding:8px 16px;border-radius:8px;background:var(--blue);color:var(--tag-ink);font-weight:700;list-style:none}
.check details summary::-webkit-details-marker{display:none}
.check details[open] summary{background:none;color:var(--blue);padding-left:0}
.check details[open] summary::after{content:" (접기)"}
.check details p{margin:8px 0 0;padding:10px 14px;background:var(--blue-bg);border-radius:8px}

/* 실전 문제 */
.qbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:4px 0 16px}
.chip{border:1.5px solid var(--line);background:var(--paper);border-radius:999px;padding:6px 14px;cursor:pointer;font-size:15px}
.chip[aria-pressed=true]{border-color:var(--ink);background:var(--ink);color:var(--bg)}
.qstat{margin-left:auto;font-size:15px;color:var(--muted)}
.qhelp{font-size:15px;color:var(--muted);margin:0 0 12px}
.qlist{max-width:760px;margin:0 auto}
.q{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:16px;margin:0 0 16px;scroll-margin-top:72px}
.q.bad{border-color:var(--bad)}.q.good{border-color:var(--ok)}
.qhead{font-size:13px;color:var(--muted);margin-bottom:6px}
.qhead b{color:var(--ink)}
.qtext{font-weight:700;margin:0 0 12px}
.zoom{overflow:auto;margin:0 0 4px;border-radius:6px;background:#fff;cursor:zoom-in}
.zoom img{width:100%;height:auto;display:block}
.zoom.big{cursor:zoom-out}
.zoom.big img{width:1000px;max-width:none}
.zhint{font-size:13px;color:var(--muted);margin:0 0 12px}
@media (min-width:960px){.zhint{display:none}.zoom{cursor:default}.zoom.big img{width:100%}}
.opts{display:grid;gap:8px}
.opts.row{grid-template-columns:repeat(auto-fit,minmax(52px,1fr))}
.opt{text-align:left;border:1.5px solid var(--line);background:var(--bg);border-radius:8px;padding:10px 12px;cursor:pointer;line-height:1.5}
.opts.row .opt{text-align:center;font-size:20px;padding:8px 0}
.opt[aria-pressed=true]{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}
.opt.right{border-color:var(--ok);background:var(--blue-bg)}
.opt.wrong{border-color:var(--bad);background:var(--red-bg)}
.qact{display:flex;gap:8px;margin-top:12px;align-items:center}
.btn{border:0;background:var(--ink);color:var(--bg);border-radius:8px;padding:10px 18px;font-weight:700;cursor:pointer}
.btn:disabled{opacity:.35;cursor:default}
.btn.ghost{background:none;color:var(--muted);border:1.5px solid var(--line)}
.need{font-size:14px;color:var(--muted)}
.q.good .need,.q.bad .need{display:none}
.past{font-size:12px;font-weight:700;padding:1px 7px;border-radius:4px;margin-left:6px;vertical-align:1px}
.past.good{background:var(--blue-bg);color:var(--blue)}.past.bad{background:var(--red-bg);color:var(--red)}
.result{margin-top:12px;padding:12px 14px;border-radius:8px;font-size:16px}
.result.good{background:var(--blue-bg)}.result.bad{background:var(--red-bg)}
.result b{display:block;margin-bottom:4px}
.result details{margin-top:8px;font-size:15px;color:var(--muted)}
.result summary{cursor:pointer;color:var(--ink)}
.empty{text-align:center;color:var(--muted);padding:48px 0}

/* 숫자 암기 */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px;max-width:900px;margin:0 auto}
.card{min-height:140px;border:1px solid var(--line);border-radius:12px;background:var(--paper);cursor:pointer;padding:14px;
  display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center}
.card .k{font-size:24px;font-weight:800;line-height:1.3;font-variant-numeric:tabular-nums}
.card .back{display:none;flex-direction:column;align-items:center}
.card.open .front{display:none}
.card.open .back{display:flex}
.card .v{font-size:15px;margin-top:4px}
.card .v1{font-size:16px;font-weight:700;line-height:1.45}
.card .m{font-size:14px;margin-top:6px;color:var(--yellow-ink);font-weight:700}
.card.open{background:var(--yellow-bg);border-color:var(--center)}
.card.open .k{font-size:20px}
.card.ok{border-color:var(--blue)}
.card.ng{border-color:var(--red);border-width:2px}
.card .judge{display:flex;gap:6px;margin-top:10px}
.card .judge button{font:inherit;font-size:13px;border:1.5px solid var(--line);background:var(--paper);border-radius:999px;padding:4px 10px;cursor:pointer}
.card .judge [data-j=ok]{color:var(--blue)}.card .judge [data-j=ng]{color:var(--red)}

@media (min-width:960px){
  body{font-size:18.5px}
  .tabs-top{display:flex}
  #tocbtn{display:none}
  .tabs-bottom{display:none}
  main{padding-bottom:48px}
  .layout{display:grid;grid-template-columns:240px 1fr;gap:40px}
  .toc{display:block;position:sticky;top:76px;align-self:start;max-height:calc(100vh - 96px);overflow:auto;font-size:14.5px;padding-top:8px}
  body.tocopen .toc{position:sticky;box-shadow:none;border:0;background:none;left:auto;right:auto;top:76px;padding:8px 0 0}
  .toc a,body.tocopen .toc a{display:block;color:var(--muted);text-decoration:none;padding:5px 0 5px 12px;border-left:3px solid var(--line);line-height:1.4}
  .toc a.on{color:var(--ink);border-left-color:var(--center);font-weight:700}
  .doc{margin:0}
}
@media (prefers-reduced-motion: reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* 실전 문제 확장: 장 바로가기, 찍었어요, 모의시험 */
.modes{margin-bottom:8px}
.golink{display:inline-block;margin-top:8px;font-size:15px;font-weight:700}
.btn.small{font-size:14px;padding:6px 12px;margin-top:10px}
.mockstart{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:16px;margin-bottom:16px}
#mockbar.running{position:sticky;z-index:5;background:var(--bg)}
.mockhead{display:flex;justify-content:space-between;align-items:center;gap:12px;background:var(--bg);padding:8px 0;margin-bottom:12px;border-bottom:1px solid var(--line)}
#clock{font-weight:800;font-variant-numeric:tabular-nums}
.scorebox{border-radius:12px;padding:16px;margin-bottom:16px;font-size:17px}
.scorebox b{font-size:28px}
.scorebox.pass{background:var(--blue-bg)}.scorebox.fail{background:var(--red-bg)}

[hidden]{display:none!important}

/* 앱 설치 버튼과 아이폰 안내 */
#install{flex:none;background:var(--center);color:#1d2125;border:0;border-radius:999px;font-size:14px;font-weight:800;padding:6px 12px;cursor:pointer;white-space:nowrap}
#iosinstall{border:0;border-radius:16px;padding:20px;max-width:min(420px,calc(100vw - 32px));background:var(--paper);color:var(--ink);font-size:16px;line-height:1.6}
#iosinstall::backdrop{background:rgba(0,0,0,.5)}
#iosinstall h3{margin:0 0 8px;font-size:18px}
#iosinstall ol{padding-left:20px;margin:0 0 16px}
#iosinstall li{margin-bottom:6px}
#iosinstall form{text-align:right}
#iosinstall .share{display:inline-block;width:14px;height:17px;vertical-align:-2px;border:2px solid var(--blue);border-top-color:transparent;border-radius:3px;position:relative}
#iosinstall .share::before{content:"↑";position:absolute;left:50%;top:-11px;transform:translateX(-50%);color:var(--blue);font-weight:800;font-size:15px;line-height:1}