:root{
  --paper:#fbfaf7; --ink:#263e32; --accent:#285d43; --accent2:#2a7d63;
  --muted:#6a756d; --line:#dde3dc; --wash:#edf3ed; --wrong:#8a3b36; --ok:#1f6b4a;
}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);
  font-family:system-ui,-apple-system,"Segoe UI","Apple SD Gothic Neo",sans-serif;
  line-height:1.65;word-break:keep-all}
.hidden{display:none !important}
.muted{color:var(--muted);font-size:.9em}
.right{margin-left:auto}
.error{color:var(--wrong)}
button{font:inherit;cursor:pointer}
a,.link{color:var(--accent);background:none;border:none;text-decoration:underline;text-underline-offset:3px}
.primary{background:var(--accent);color:#fff;border:none;border-radius:8px;padding:.6em 1.1em}
.primary:hover{background:var(--accent2)}

/* 로그인 */
.login{min-height:100vh;display:grid;place-items:center;padding:24px}
.login-box{max-width:420px;width:100%;background:#fff;border:1px solid var(--line);
  border-radius:14px;padding:32px}
.login-box h1{font-family:"Nanum Myeongjo",serif;margin:0 0 6px}
.login-box form{display:flex;gap:8px;margin-top:14px}
.login-box input{flex:1;padding:.6em;border:1px solid var(--line);border-radius:8px}

/* 레이아웃 */
.topbar{display:flex;align-items:center;gap:18px;padding:12px 20px;
  background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.brand{font-weight:700}
.tabs{display:flex;gap:4px}
.tab{background:none;border:1px solid transparent;border-radius:8px;padding:.4em .9em;color:var(--muted)}
.tab.active{color:var(--accent);border-color:var(--line);background:var(--wash)}
.who{margin-left:auto;display:flex;gap:12px;align-items:center;font-size:.92em}

.view{max-width:860px;margin:0 auto;padding:22px}
#view-index.view{max-width:1100px}

/* 풀기 시작 화면 */
.start-panel{display:flex;flex-direction:column;gap:20px}
.start-block{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px}
.start-block h3{margin:0 0 12px;font-size:1em}
.start-config{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.start-config label{font-size:.9em;color:var(--muted);display:flex;align-items:center;gap:6px}
.start-config select{padding:.45em .5em;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink)}
.start-config .check{color:var(--ink)}
.start-config .primary{margin-left:auto}
.quickstart button span.muted{font-size:.82em;font-weight:400}

.stage{min-height:300px}
.empty{display:grid;place-items:center;gap:14px;min-height:260px;color:var(--muted);
  border:1px dashed var(--line);border-radius:12px;padding:24px;text-align:center}
.empty-title{font-size:1.1em;color:var(--ink);margin:0}
.quickstart{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.ghost{background:#fff;color:var(--accent);border:1px solid var(--line);border-radius:8px;padding:.6em 1.1em}
.ghost:hover{border-color:var(--accent2);background:var(--wash)}

.session-bar{display:flex;justify-content:space-between;align-items:center;
  background:var(--wash);border:1px solid var(--line);border-radius:10px;
  padding:.5em .9em;margin-bottom:12px;font-size:.92em}
.session-bar .sb-score b{font-weight:700}

.opt.selected{border-color:var(--accent2);background:var(--wash)}
#submit.is-next{background:var(--accent2)}
.kbd-hint{margin-left:auto;font-size:.82em}

.summary{background:#fff;border:1px solid var(--line);border-radius:12px;padding:28px;text-align:center}
.summary h2{margin:0 0 8px}
.sum-score{font-size:1.1em;margin:0 0 18px}
.sum-score b{color:var(--accent)}
.sum-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}

.flash{position:fixed;left:50%;bottom:40px;transform:translateX(-50%) translateY(12px);
  background:var(--ink);color:#fff;padding:.7em 1.2em;border-radius:10px;font-size:.92em;
  opacity:0;pointer-events:none;transition:opacity .18s,transform .18s;z-index:50}
.flash.show{opacity:1;transform:translateX(-50%) translateY(0)}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px}
.card-meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:14px}
.chip{background:var(--wash);color:var(--accent);border-radius:999px;padding:.15em .7em;font-size:.8em;font-weight:600}
.chip.alt{background:#eef0f4;color:#3b4a66}
.qid{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.78em;
  color:var(--muted);background:var(--wash);padding:.15em .55em;border-radius:6px;cursor:pointer}
.qid:hover{color:var(--accent)}
.card-meta .right{margin-left:auto}
.prompt{font-size:1.05em;margin:6px 0 14px}
.prompt p{margin:.4em 0}
/* 코드블록: 어디에 있든(지문·해설·모범답안·모달·색인) 가로 스크롤로 가두어 페이지 폭을 안 늘림 */
pre{background:#f3f5f1;border:1px solid var(--line);border-radius:8px;
  padding:12px;overflow-x:auto;max-width:100%;font-size:.9em;line-height:1.5;white-space:pre}
pre code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
/* 긴 비공백 토큰이 컨테이너를 밀어내지 않도록 */
.card,.prompt,.options,.browse-card,.idx-q-body,.set-q,#qmodal-body,.feedback{overflow-wrap:anywhere}
.subpart{border-left:3px solid var(--line);padding-left:12px;margin:10px 0;color:#30473b}
.images img{max-width:100%;border:1px solid var(--line);border-radius:8px;margin:8px 0;background:#fff}

.options{display:grid;gap:10px;margin:8px 0}
.opt{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);
  border-radius:10px;padding:.7em .9em}
.opt:hover{border-color:var(--accent2)}
.opt input{margin-top:.25em}
.opt.correct{border-color:var(--ok);background:#eef7f1}
.opt.wrong{border-color:var(--wrong);background:#f8eeed}
.opt .no{font-weight:700;color:var(--accent)}

.write textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:.8em;font:inherit;resize:vertical}

.actions{display:flex;gap:14px;align-items:center;margin-top:16px}

.feedback{margin-top:18px;border-top:1px solid var(--line);padding-top:16px}
.verdict{font-weight:700;font-size:1.05em}
.verdict.ok{color:var(--ok)} .verdict.no{color:var(--wrong)}
.feedback h4{margin:14px 0 6px}
.feedback pre{background:#f3f5f1;border:1px solid var(--line);border-radius:8px;padding:12px;overflow:auto}
.checks{margin:6px 0 0;padding-left:18px}
.selfscore{display:flex;gap:10px;align-items:center;margin-top:10px;flex-wrap:wrap}
.selfscore input{width:90px;padding:.4em;border:1px solid var(--line);border-radius:8px}
.note{font-size:.85em;color:var(--muted);margin-top:8px}

/* 통계 */
.stats{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px}
.stats h2{font-size:1.05em;margin:22px 0 10px}
.stats h2:first-child{margin-top:0}
.overall{display:flex;gap:26px;flex-wrap:wrap;font-size:1.05em}
.overall b{font-size:1.5em;color:var(--accent);display:block}
.bar-row{display:grid;grid-template-columns:200px 1fr 120px;gap:10px;align-items:center;margin:6px 0}
@media(max-width:620px){.bar-row{grid-template-columns:1fr}}
.bar{background:var(--wash);border-radius:999px;height:16px;overflow:hidden}
.bar > span{display:block;height:100%;background:var(--accent2)}
.wrong-list{list-style:none;padding:0;margin:0;max-height:360px;overflow:auto}
.wrong-list li{border-bottom:1px solid var(--line);padding:8px 0;font-size:.92em;display:flex;gap:10px}

.tally{font-size:.9em;color:var(--accent);margin:6px 0}

/* 벼락치기 */
.cram-strategy{background:var(--wash);border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin:10px 0 20px}
.cram-strategy h3{margin:0 0 8px;font-size:1em}
.cram-strategy ul{margin:0;padding-left:20px}
.cram-strategy li{margin:6px 0}
.cram-h{margin:26px 0 12px;padding-bottom:6px;border-bottom:2px solid var(--line)}
.cram-domain{border:1px solid var(--line);border-radius:10px;margin:8px 0;padding:6px 16px}
.cram-domain > summary{cursor:pointer;font-weight:600;padding:8px 0}
.cram-list{margin:6px 0 12px;padding-left:20px}
.cram-list li{margin:7px 0;line-height:1.6}
.cram-table{width:100%;border-collapse:collapse;margin:8px 0 14px;font-size:.92em}
.cram-table th,.cram-table td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);vertical-align:middle}
.cram-table th{background:var(--wash)}
.cram-table code{background:var(--wash);padding:.1em .4em;border-radius:5px}

/* 소주제 섹션: 용어→설명 정렬 */
.cram-sec{margin:16px 0}
.cram-sec h4{margin:0 0 7px;font-size:.98em;color:var(--accent)}
.sec-lead{margin:0 0 9px;font-size:.9em;color:var(--muted);line-height:1.55}

/* 풀이 예제 */
.cram-ex{border:1px solid var(--accent);border-radius:8px;margin:10px 0;overflow:hidden;background:#fff}
.cram-ex .ex-q{background:var(--wash);padding:9px 12px;font-size:.9em;font-weight:600}
.cram-ex .ex-work{margin:0;border:none;border-radius:0;border-top:1px solid var(--line);background:#fbfcfb;font-size:.85em}
.cram-ex .ex-a{padding:9px 12px;border-top:1px solid var(--line);font-size:.9em;color:var(--ok);font-weight:600}
.cram-kv{display:grid;grid-template-columns:minmax(120px,30%) 1fr;gap:1px;
  border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--line)}
.cram-kv .kv-k{background:var(--wash);padding:7px 10px;font-weight:600;font-size:.9em}
.cram-kv .kv-v{background:#fff;padding:7px 10px;font-size:.92em;line-height:1.5}
@media(max-width:600px){.cram-kv{grid-template-columns:1fr}.cram-kv .kv-k{padding-bottom:0}}

/* 클래스 다이어그램 도식 */
.cd-row{display:flex;gap:18px;align-items:center;flex-wrap:wrap;margin:8px 0 14px}
.cd-fig{background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px}
.cd-fig .cd-svg{display:block;width:240px;height:auto}
.cd-fig-wide{overflow-x:auto}
.cd-fig-wide .cd-svg{width:500px;max-width:none}
.cd-note{flex:1;min-width:220px;font-size:.92em;line-height:1.6}
.cd-rel .glyph-cell{width:80px}
.glyph{width:66px;height:22px;display:block}

/* 풀이 로그 */
.log-wrap{max-height:440px;overflow:auto;border:1px solid var(--line);border-radius:8px}
.log-table{width:100%;border-collapse:collapse;font-size:.88em}
.log-table th,.log-table td{text-align:left;padding:7px 10px;border-bottom:1px solid var(--line);white-space:nowrap}
.log-table th{position:sticky;top:0;background:var(--wash);z-index:1}
.log-table code.link-q{cursor:pointer}
.r-ok{color:var(--ok);font-weight:600}
.r-no{color:var(--wrong);font-weight:600}

.link-q{cursor:pointer}
.link-q:hover{color:var(--accent);text-decoration:underline}

/* 문제 열람 모달 */
.qmodal{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:24px}
.qmodal-backdrop{position:absolute;inset:0;background:rgba(20,30,25,.5)}
.qmodal-box{position:relative;background:#fff;border-radius:14px;max-width:760px;width:100%;
  max-height:86vh;overflow:auto;padding:28px 26px;box-shadow:0 20px 60px rgba(0,0,0,.25)}
.qmodal-close{position:absolute;top:12px;right:14px;background:none;border:none;font-size:1.2em;color:var(--muted);cursor:pointer}
.qmodal-close:hover{color:var(--ink)}

/* 풀이 셋 기록 */
.set-acts{display:flex;gap:8px;padding:6px 0 10px}
.set-acts button{font-size:.85em;padding:.4em .9em}
.set-row{border:1px solid var(--line);border-radius:10px;margin:8px 0;padding:6px 14px}
.set-row > summary{cursor:pointer;padding:6px 0;font-size:.92em}
.set-body{padding:4px 0 8px;max-height:320px;overflow:auto}
.set-q{display:flex;align-items:center;gap:8px;padding:5px 0;border-top:1px dashed var(--line);font-size:.86em}
.set-q .right{margin-left:auto}

/* 주제별 색인 — 2단(좌: 모듈 목록 / 우: 문제 열람) */
.idx-layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:20px;align-items:start}
@media(max-width:820px){.idx-layout{grid-template-columns:1fr}}
.idx-nav{position:sticky;top:70px;max-height:calc(100vh - 90px);overflow:auto;
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px}
.idx-nav-domain{font-weight:700;font-size:.9em;color:var(--accent);padding:12px 8px 4px}
.idx-nav-domain:first-child{padding-top:4px}
.idx-nav-mod{display:flex;justify-content:space-between;gap:10px;width:100%;text-align:left;
  background:none;border:none;border-radius:8px;padding:.5em .6em;color:var(--ink);font-size:.9em}
.idx-nav-mod:hover{background:var(--wash)}
.idx-nav-mod.active{background:var(--accent);color:#fff}
.idx-nav-mod.active .muted{color:#dbeee4}

.idx-content{min-height:300px;min-width:0}
.idx-hint{display:grid;place-items:center;height:200px;border:1px dashed var(--line);border-radius:12px}
.idx-head{display:flex;align-items:center;gap:14px;margin-bottom:12px}
.idx-head h2{margin:0;font-size:1.1em;flex:1}
.idx-filters{display:flex;align-items:center;gap:16px;flex-wrap:wrap;background:#fff;
  border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin-bottom:14px;font-size:.9em}
.idx-filters select{padding:.35em .5em;border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--ink);margin-left:4px}
.browse-stat{font-size:.85em;color:var(--muted);margin:4px 0 2px;display:flex;gap:10px;align-items:center}
.browse-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin-bottom:14px}
.browse-card .prompt{font-size:1em;margin:8px 0}
.browse-card .options{margin:8px 0}
.browse-card .opt{padding:.5em .8em}
.toggle-ans{margin-top:6px}
.browse-answer{margin-top:12px;border-top:1px solid var(--line);padding-top:12px}
.view-answer{font-weight:700;color:var(--ok);margin:4px 0}

/* ---------- 모바일 (<= 600px) ---------- */
@media(max-width:600px){
  .topbar{flex-wrap:wrap;gap:8px 12px;padding:10px 14px}
  .brand{font-size:.95em}
  .tabs{order:3;width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .tab{white-space:nowrap}
  .who{font-size:.85em;gap:10px}

  .view,#view-index.view{padding:14px}
  .card,.browse-card,.start-block,.summary,.stats,.login-box{padding:16px}
  .prompt{font-size:1em}
  .actions{flex-wrap:wrap;gap:10px}
  .kbd-hint{display:none}

  .session-bar{flex-wrap:wrap;gap:4px 10px}
  .start-config{gap:10px}
  .start-config label{flex:1 1 44%}
  .start-config select{width:100%}
  .start-config .primary{margin-left:0;width:100%}
  .quickstart button{width:100%}

  /* 색인: 좌측 목록은 상단 가로 스크롤 띠로 */
  .idx-nav{position:static;max-height:40vh}
  .idx-head{flex-wrap:wrap}
  .idx-filters{gap:10px}

  .qmodal{padding:10px}
  .qmodal-box{padding:22px 16px;max-height:92vh}

  .overall{gap:14px 22px}
  .log-table{font-size:.82em}
}