:root{
  --bg:#000000; --card:#1e293b; --border:#334155; --text:#e2e8f0; --muted:#ffffff;
  --accent:#ff0000; --purple:#ff0000; --green:#34d399; --red:#f87171;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--text);
  font-family:Helvetica,Arial,"Segoe UI",system-ui,sans-serif;font-size:15px;line-height:1.5}
button,input,select,textarea{font:inherit;color:inherit}

.app{display:flex;min-height:100vh}
.sidebar{width:240px;flex-shrink:0;border-right:1px solid var(--card);padding:26px 12px 18px;
  display:flex;flex-direction:column;position:sticky;top:0;height:100vh;overflow-y:auto}
.brand{padding:0 8px}
.brand h1{margin:0;font-size:20px;color:var(--accent)}
.brand p{margin:2px 0 20px;font-size:12px;color:var(--muted)}
.nav{display:flex;flex-direction:column;gap:2px}
.nav button{background:none;border:0;border-radius:6px;text-align:left;padding:9px 14px;
  color:var(--muted);cursor:pointer;font-size:14px}
.nav button:hover{background:var(--card);color:var(--text)}
.nav button.active{background:var(--card);color:var(--accent)}
.side-bottom{margin-top:auto;padding:16px 8px 0}
.filebox{border:1px solid var(--border);border-radius:8px;padding:12px;margin-bottom:16px;background:var(--card);font-size:12px;color:var(--muted)}
.filebox b{color:var(--text);word-break:break-word}
.filebox .btn{width:100%;padding:8px 10px;font-size:13px;margin-top:10px}
.role{display:inline-block;font-size:11px;font-weight:bold;padding:1px 8px;border-radius:4px;margin-bottom:6px;
  background:#065f46;color:#6ee7b7}
.total{font-weight:bold;color:var(--purple);font-size:14px}
.main{flex:1;min-width:0;padding:28px 36px 60px}
.page{max-width:900px}

@media (max-width:820px){
  .app{flex-direction:column}
  .sidebar{width:100%;height:auto;position:static;border-right:0;border-bottom:1px solid var(--card);padding:16px 12px}
  .nav{flex-direction:row;overflow-x:auto;padding-bottom:4px}
  .nav button{white-space:nowrap}
  .side-bottom{padding-top:12px}
  .main{padding:20px 16px 48px}
}

h2.title{margin:0;font-size:28px;color:var(--accent)}
.sub{margin:2px 0 20px;color:var(--muted);font-size:14px}
h3{font-size:18px;margin:22px 0 10px}
label.lbl{display:block;font-weight:bold;margin:0 0 4px}
.muted{color:var(--muted)}

.btn{border:0;border-radius:6px;padding:11px 16px;cursor:pointer;font-weight:bold;
  background:var(--accent);color:var(--bg)}
.btn.secondary{background:var(--card);color:var(--text);border:1px solid var(--border)}
.btn.danger{background:var(--red);color:var(--bg)}
.btn:disabled{background:var(--border);color:var(--muted);cursor:not-allowed}
.btn.block{display:block;width:100%}
.btn:focus-visible,.nav button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
input[type=text],input[type=password],textarea,select{width:100%;background:var(--card);border:1px solid var(--border);
  border-radius:6px;padding:10px 12px;outline:none}
input[type=text]:focus,input[type=password]:focus,textarea:focus,select:focus{border-color:var(--accent)}
textarea{resize:vertical;min-height:110px}
select{width:auto;min-width:160px}
.field{margin-bottom:16px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.grid2 .cell small{display:block;font-weight:bold;color:var(--muted);margin-bottom:3px}
@media (max-width:620px){.grid2{grid-template-columns:1fr}}
.check{display:flex;align-items:center;gap:8px;cursor:pointer}
.check input{accent-color:var(--accent);width:16px;height:16px}

.card{background:var(--card);border:1px solid var(--border);border-radius:8px}
.notice{border-radius:6px;padding:12px 14px;font-weight:bold;margin:8px 0}
.notice.info{background:#0c2d48;color:#7dd3fc}
.notice.warn{background:#422006;color:#fcd34d}
.notice.success{background:#065f46;color:#6ee7b7}
.notice.error{background:#ff0000;color:#ffffff}
.metrics{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px;margin-bottom:20px}
.metric{border:1px solid var(--border);border-radius:8px;padding:16px;text-align:center}
.metric .v{font-size:30px;font-weight:bold}
.metric .c{font-size:12px;color:var(--muted)}
.actions{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:20px}

.qcard{padding:14px 18px;margin-bottom:12px}
.qtop{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.qid{font-size:12px;font-weight:bold;color:#64748b}
.badge{background:#065f46;color:#6ee7b7;font-size:12px;font-weight:bold;padding:2px 10px;border-radius:4px}
.qtext{font-weight:bold;font-size:16px;margin-bottom:10px;white-space:pre-wrap;overflow-wrap:anywhere}
.qopts{display:grid;grid-template-columns:1fr 1fr;gap:4px 14px;font-size:14px}
.qopts .correct{color:var(--green);font-weight:bold}
@media (max-width:620px){.qopts{grid-template-columns:1fr}}

.infocard{padding:16px 18px;margin-bottom:8px}
.infocard dl{display:grid;grid-template-columns:max-content 1fr;gap:6px 16px;margin:0}
.infocard dt{color:var(--muted)}
.infocard dd{margin:0;font-weight:bold;overflow-wrap:anywhere}
.btnrow{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}

.bar{height:8px;background:var(--card);border:1px solid var(--border);border-radius:99px;overflow:hidden;margin-bottom:8px}
.bar>div{height:100%;background:var(--accent);transition:width .25s}
.qbig{font-size:20px;font-weight:bold;white-space:pre-wrap;overflow-wrap:anywhere;margin:0}
.opt{display:flex;align-items:flex-start;gap:10px;background:var(--card);border:1px solid var(--border);
  border-radius:6px;padding:12px 14px;margin:8px 0;cursor:pointer;font-size:16px}
.opt input{margin-top:5px;accent-color:var(--accent)}
.opt.locked{cursor:default}
.opt.good{color:var(--green);border-color:var(--green)}
.opt.bad{color:var(--red);border-color:var(--red)}
.wrong-card{padding:12px 16px;margin-bottom:8px}
.wrong-card .q{font-weight:bold;white-space:pre-wrap}
.wrong-card .y{color:var(--red);font-size:14px}
.wrong-card .a{color:var(--green);font-size:14px}

.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);opacity:0;pointer-events:none;
  padding:12px 20px;border-radius:8px;font-weight:bold;transition:.2s;z-index:10;max-width:90vw;text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.info{background:#0c2d48;color:#7dd3fc}
.toast.warn{background:#422006;color:#fcd34d}
.toast.success{background:#065f46;color:#6ee7b7}
.toast.error{background:#ff0000;color:#ffffff}
.linkbtn{background:none;border:0;color:var(--muted);cursor:pointer;font-size:12px;text-decoration:underline;padding:6px 0 0}
.linkbtn:hover{color:var(--text)}
ol.steps{padding-left:20px;margin-top:0}
ol.steps li{margin-bottom:6px}
.drop{outline:2px dashed var(--accent);outline-offset:-8px}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* Pure white text on the main quiz buttons */
#qaStart,#qStart,#qSubmit,#qNext{color:#ffffff}

/* ───────── Passage-based questions (one passage, several sub-questions) ───────── */
.page.wide{max-width:1240px}
.qlayout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:22px;align-items:start;margin-top:6px}
/* the passage stays in view while the student works through every question of the set */
.passage{position:sticky;top:16px;max-height:calc(100vh - 32px);overflow-y:auto;
  background:var(--card);border:1px solid var(--border);border-left:4px solid var(--accent);
  border-radius:8px;padding:14px 18px}
.passage h4{margin:0 0 8px;font-size:13px;letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.setbadge{display:inline-block;margin:0 0 10px;padding:2px 10px;border-radius:4px;
  background:var(--accent);color:#ffffff;font-size:12px;font-weight:bold}

/* text + tables inside passages and questions */
.rich p{margin:0 0 10px;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.6}
.rich p:last-child{margin-bottom:0}
.qbig.qrich{white-space:normal}
.tscroll{overflow-x:auto;margin:8px 0 12px}
.ptable{border-collapse:collapse;min-width:60%;font-size:14px;font-weight:normal}
.ptable th,.ptable td{border:1px solid var(--border);padding:6px 12px;text-align:left;vertical-align:top}
.ptable th{background:#0f172a;color:var(--text);font-weight:bold}

/* collapsed passage in the question bank and in the wrong-answer review */
.qpassage{margin:6px 0 10px;font-size:14px;font-weight:normal}
.qpassage summary{cursor:pointer;color:var(--muted)}
.qpassage .rich{margin-top:8px;padding:10px 12px;border:1px solid var(--border);border-radius:6px}

/* narrow screens: one column, passage pinned to the top of the screen */
@media (max-width:980px){
  .qlayout{grid-template-columns:1fr}
  .passage{top:0;max-height:38vh;z-index:5}
}