:root{
  --ink:#14202e;
  --paper:#fbf9f4;
  --panel:#ffffff;
  --line:#dfe4e9;
  --accent:#2f6f6a;       /* deep teal */
  --accent-soft:#e3efee;
  --signal:#c9622f;        /* terracotta for warnings/wrong */
  --good:#2f6f6a;
  --muted:#5d6b78;
  --shadow:0 1px 2px rgba(20,32,46,.06),0 8px 24px rgba(20,32,46,.05);
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
}
*{box-sizing:border-box}
html,body{margin:0}
body{
  font-family:"Georgia","Times New Roman",serif;
  background:var(--paper);color:var(--ink);
  -webkit-font-smoothing:antialiased;line-height:1.5;
}
.ui,button,input,select,textarea{font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;}
header.bar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 22px;border-bottom:1px solid var(--line);background:var(--panel);
  position:sticky;top:0;z-index:20;
}
.brand{display:flex;align-items:baseline;gap:12px}
.brand b{font-size:19px;letter-spacing:.3px}
.brand .tag{font-family:ui-sans-serif,system-ui,sans-serif;font-size:11px;letter-spacing:1.5px;text-transform:uppercase;color:var(--muted)}
.modes{display:flex;gap:6px;background:var(--paper);padding:4px;border-radius:10px;border:1px solid var(--line)}
.modes button{
  border:0;background:transparent;padding:7px 16px;border-radius:7px;cursor:pointer;
  font-size:13px;font-weight:600;color:var(--muted)
}
.modes button.active{background:var(--accent);color:#fff}
main{max-width:980px;margin:0 auto;padding:30px 22px 80px}
.view{display:none}.view.active{display:block}

/* ---------- shared ---------- */
h1{font-size:30px;margin:0 0 4px}
.lede{color:var(--muted);font-size:15px;margin:0 0 26px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px;margin-bottom:16px;box-shadow:var(--shadow)}
label.fld{display:block;font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px;font-weight:600;letter-spacing:.4px;text-transform:uppercase;color:var(--muted);margin:0 0 6px}
input[type=text],input[type=email],textarea,select{
  width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:8px;font-size:14px;background:#fff;color:var(--ink)
}
textarea{resize:vertical;line-height:1.5}
input:focus,textarea:focus,select:focus{outline:2px solid var(--accent);outline-offset:0;border-color:transparent}
input.invalid{border-color:var(--signal)}
input.invalid:focus{outline-color:var(--signal)}
.field-error{font-family:ui-sans-serif,system-ui,sans-serif;font-size:12.5px;color:var(--signal);margin:6px 0 0}
.btn{
  border:0;border-radius:9px;padding:10px 18px;font-size:14px;font-weight:600;cursor:pointer;
  transition:background-color .15s,border-color .15s,color .15s,opacity .15s,transform .1s;
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
}
.btn.primary{background:var(--accent);color:#fff}
.btn.ghost{background:#fff;border:1px solid var(--line);color:var(--ink)}
.btn.sm{padding:6px 12px;font-size:12.5px}
.btn.danger{background:#fff;border:1px solid var(--signal);color:var(--signal)}
.btn.primary:hover:not(:disabled){background:#265c58}
.btn.ghost:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}
.btn.danger:hover:not(:disabled){background:#fef3ef}
.btn:active:not(:disabled){transform:scale(.97)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn:disabled,.btn[disabled]{opacity:.5;cursor:not-allowed}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.spacer{flex:1}

/* ---------- admin ---------- */
.qedit{border:1px solid var(--line);border-radius:12px;padding:16px;margin-bottom:14px;background:var(--panel)}
.qedit .qhd{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.qnum{font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px;font-weight:700;color:#fff;background:var(--accent);width:26px;height:26px;border-radius:50%;display:grid;place-items:center;flex:none}
.opts{display:grid;gap:8px;margin-top:10px}
.opt{display:flex;align-items:center;gap:10px}
.opt input[type=radio]{width:18px;height:18px;accent-color:var(--accent);flex:none}
.opt input[type=text]{flex:1}
.hint{font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px;color:var(--muted);margin-top:6px}
.mt{margin-top:14px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.tc{display:grid;grid-template-columns:1fr 1fr auto;gap:8px;align-items:center;margin-bottom:8px}
.pill{font-family:ui-sans-serif,system-ui,sans-serif;font-size:11px;font-weight:600;padding:2px 9px;border-radius:20px;border:1px solid var(--line);color:var(--muted)}
.pill.hidden{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}

/* ---------- candidate ---------- */
.progress{height:6px;background:var(--line);border-radius:4px;overflow:hidden;margin-bottom:24px}
.progress > div{height:100%;background:var(--accent);width:0;transition:width .3s}
.qcard .qtext{font-size:18px;margin:0 0 16px;font-weight:600}
.qcard .qcode{font-family:var(--mono);font-size:13px;background:#0f1b29;color:#dce6f0;border-radius:10px;padding:14px;margin:0 0 16px;white-space:pre-wrap;overflow-x:auto}
.choices{display:grid;gap:10px}
.choice{
  display:flex;align-items:center;gap:12px;padding:13px 15px;border:1px solid var(--line);
  border-radius:10px;cursor:pointer;font-family:ui-sans-serif,system-ui,sans-serif;font-size:14.5px;background:#fff;
  transition:border-color .15s,background-color .15s;user-select:none;
}
.choice:hover{border-color:var(--accent)}
.choice:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-color:var(--accent)}
.choice.sel{border-color:var(--accent);background:var(--accent-soft)}
.choice .mk{width:22px;height:22px;border-radius:50%;border:2px solid var(--line);flex:none;display:grid;place-items:center}
.choice.sel .mk{border-color:var(--accent);background:var(--accent)}
.choice.sel .mk::after{content:"";width:8px;height:8px;border-radius:50%;background:#fff}
.codewrap{display:grid;grid-template-columns:1fr;gap:14px}
.editor{
  width:100%;min-height:300px;font-family:var(--mono);font-size:13.5px;line-height:1.55;
  border:1px solid var(--line);border-radius:10px;padding:14px;background:#0f1b29;color:#dce6f0;tab-size:2
}
.console{font-family:var(--mono);font-size:13px;background:#0f1b29;color:#dce6f0;border-radius:10px;padding:14px;min-height:60px;white-space:pre-wrap}
.tcrow{display:flex;align-items:center;gap:10px;padding:8px 12px;border:1px solid var(--line);border-radius:8px;margin-bottom:6px;font-family:ui-sans-serif,system-ui,sans-serif;font-size:13px}
.dot{width:10px;height:10px;border-radius:50%;flex:none;background:var(--line)}
.dot.pass{background:var(--good)}.dot.fail{background:var(--signal)}
.scorebig{font-size:54px;font-weight:700;color:var(--accent);line-height:1}
.meta{font-family:ui-sans-serif,system-ui,sans-serif;font-size:13px;color:var(--muted)}
.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 18px;border-radius:10px;font-family:ui-sans-serif,system-ui,sans-serif;font-size:13px;opacity:0;transition:opacity .25s;pointer-events:none;z-index:50}
.toast.show{opacity:1}
.small{font-size:12px}
.danger-text{color:var(--signal)}

/* ---------- proctoring ---------- */
.rec-badge{display:inline-flex;align-items:center;gap:7px;font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px;font-weight:600;color:var(--signal);border:1px solid var(--signal);background:#fff;padding:4px 10px;border-radius:20px}
.rec-dot{width:9px;height:9px;border-radius:50%;background:var(--signal);animation:recpulse 1.4s ease-in-out infinite}
@keyframes recpulse{0%,100%{opacity:1}50%{opacity:.25}}
.proctor-overlay{
  position:fixed;inset:0;z-index:100;display:none;place-items:center;
  background:rgba(20,32,46,.92);color:#fff;text-align:center;padding:28px;
  font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
.proctor-overlay.show{display:grid}
.proctor-box{max-width:520px}
.proctor-box h2{font-family:"Georgia",serif;font-size:26px;margin:0 0 10px;color:#fff}
.proctor-box .vmsg{font-size:15px;color:#ffd9c9;margin:0 0 8px}
.proctor-box .vcount{font-size:13px;color:#cdd6df;margin:0 0 22px}
.proctor-box .btn.primary{background:var(--signal)}
.proctor-box .confirm-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
@media(max-width:640px){
  .grid2{grid-template-columns:1fr}
  .tc{grid-template-columns:1fr}
  main{padding:16px 14px 60px}
  h1{font-size:22px}
  .lede{font-size:14px;margin-bottom:18px}
  .card{padding:14px}
  header.bar{padding:10px 14px}
  .brand b{font-size:16px}
  .qcard .qtext{font-size:16px}
  .editor{min-height:180px;font-size:12px}
  /* stack nav buttons on very small screens */
  #runScreen .row.mt{flex-wrap:wrap}
  #runScreen .row.mt .spacer{display:none}
  #runScreen .row.mt .btn{flex:1 1 auto}
}