/* ===== Exam page ===== */
.exam-body{background:var(--bg)}
.exam-loading{display:grid;place-items:center;min-height:60vh;color:var(--muted)}
.exam-top{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--navy);color:#fff;padding:10px clamp(14px,3vw,32px);padding-top:calc(10px + env(safe-area-inset-top,0px))}
.exam-brand{display:flex;gap:12px;align-items:center;min-width:0}
.exam-brand img{height:38px;background:#fff;border-radius:8px;padding:3px 5px;flex-shrink:0}
.exam-brand b{display:block;font-family:var(--serif);font-weight:400;font-size:1.2rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.exam-brand span{font-size:.82rem;color:#B9C2D6}
.exam-clock{display:grid;text-align:center;background:rgba(255,255,255,.08);border:1px solid rgba(232,185,74,.5);border-radius:12px;padding:6px 16px;min-width:120px}
.exam-clock span{font-size:.72rem;color:#B9C2D6}
.exam-clock b{font-size:1.6rem;font-variant-numeric:tabular-nums;color:var(--gold-2);line-height:1.1}
.exam-clock.warn{border-color:#F2A23A}.exam-clock.warn b{color:#F7C46C}
.exam-clock.danger{border-color:#E5534B;background:rgba(229,83,75,.18)}.exam-clock.danger b{color:#FF8A80}
.exam-wrap{display:grid;grid-template-columns:280px 1fr;gap:20px;padding:20px clamp(14px,3vw,32px) 60px;max-width:1300px;margin:0 auto}
.exam-side{display:grid;gap:14px;align-content:start;position:sticky;top:84px}
.exam-student{display:flex;gap:12px;align-items:center}
.exam-student .who-txt{min-width:0}.exam-student .who-txt b{display:block}.exam-student .who-txt span{display:block;font-size:.85rem;color:var(--muted);overflow-wrap:anywhere}
.exam-progress{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:12px;font-size:.9rem}
.save-state{font-size:.78rem;color:var(--ok)}.save-state.bad{color:var(--bad);font-weight:600}
.exam-nav{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:6px}
.exam-nav button{height:40px;border-radius:9px;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:600 .9rem var(--sans);cursor:pointer}
.exam-nav button.done{background:rgba(63,160,103,.16);border-color:#3FA067;color:var(--ok)}
.exam-nav button.cur{outline:3px solid var(--gold-2);outline-offset:1px}
.dot{display:inline-block;width:10px;height:10px;border-radius:3px;border:1px solid var(--line);background:var(--bg);vertical-align:middle;margin:0 3px 0 8px}
.dot.done{background:rgba(63,160,103,.3);border-color:#3FA067;margin-left:0}
.exam-instr summary{cursor:pointer;font-weight:600}.exam-instr p{white-space:pre-wrap;margin:8px 0 0;color:var(--muted);font-size:.92rem}
.exam-main{min-width:0}
.exam-q{min-height:320px;outline:none}
.q-head{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:14px}
.q-text{font-size:1.08rem;line-height:1.7;white-space:pre-wrap;margin-bottom:18px}
.q-text .blank{display:inline-block;width:10ch;min-width:8ch;max-width:100%;padding:4px 8px;margin:0 4px;border:0;border-bottom:2px solid var(--gold);border-radius:6px 6px 0 0;background:var(--surface-2);font-size:1rem}
.q-opts{display:grid;gap:10px}
.opt{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border:1px solid var(--line);border-radius:12px;cursor:pointer;background:var(--bg)}
.opt:hover{border-color:var(--gold)}
.opt.on,.opt:has(input:checked){border-color:var(--gold);background:rgba(232,185,74,.12)}
.opt input{margin-top:3px;width:18px;height:18px;flex-shrink:0;accent-color:var(--navy)}
.q-match{display:grid;gap:10px}
.mrow{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--bg)}
.mrow .arrow{color:var(--gold-ink);font-weight:700}
@media (max-width:640px){.mrow{grid-template-columns:1fr}.mrow .arrow{display:none}}
.q-order{list-style:none;padding:0;margin:0 0 12px;display:grid;gap:8px}
.q-order li{display:flex;gap:12px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--bg)}
.ord-n{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--navy);color:var(--gold-2);font-weight:700;flex-shrink:0}
.ord-t{flex:1}.ord-b{display:flex;gap:4px}
.exam-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:14px}
.exam-actions .sp{flex:1}
.exam-actions #submit{padding:.8em 1.4em}
.exam-actions #submit:disabled{background:var(--surface-2);color:var(--muted)}
.exam-overlay{position:fixed;inset:0;z-index:100;background:rgba(5,12,26,.7);display:grid;place-items:center;padding:20px}
.exam-overlay .card{max-width:440px;text-align:center}
.exam-done{max-width:900px;margin:30px auto;padding:0 16px;display:grid;gap:16px}
.exam-msg{text-align:center;max-width:560px;margin:40px auto}
.exam-done .exam-msg{margin:0 auto;width:100%}
.big-tick{width:64px;height:64px;border-radius:50%;background:rgba(63,160,103,.16);color:var(--ok);display:grid;place-items:center;font-size:2rem;margin:0 auto 10px}
.score-big{display:flex;justify-content:center;align-items:baseline;gap:6px;margin:8px 0}
.score-big b{font-family:var(--serif);font-weight:400;font-size:3.4rem;line-height:1;color:var(--gold-ink)}
.score-big span{font-size:1.3rem;color:var(--muted)}
.exam-review{display:grid;gap:12px}
.rv .q-text{font-size:1rem;margin-bottom:8px}
pre.code-ans{background:#0F1A30;color:#E7EBF3;border-radius:10px;padding:12px;overflow:auto;font-size:.85rem;margin:6px 0}
@media (max-width:900px){
  .exam-wrap{grid-template-columns:1fr}
  .exam-side{position:static}
  .exam-nav{grid-template-columns:repeat(auto-fill,minmax(36px,1fr))}
  .exam-clock{min-width:96px;padding:4px 10px}.exam-clock b{font-size:1.3rem}
  .exam-brand b{font-size:1rem}
}
/* Code editor */
.ek-code{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--surface)}
.ek-code-bar{display:flex;gap:10px;align-items:center;justify-content:space-between;padding:8px 10px;background:var(--surface-2);border-bottom:1px solid var(--line)}
.ek-code-lang{font-weight:700;font-size:.85rem}
.ek-code .CodeMirror{height:auto;min-height:220px;font:14px/1.5 Consolas,"Cascadia Code","Courier New",monospace}
.ek-code .CodeMirror-scroll{min-height:220px}
.ek-code-src.plain{display:block;width:100%;min-height:240px;border:0;border-radius:0;font:14px/1.5 Consolas,"Courier New",monospace;background:var(--bg)}
.ek-code-io{border-top:1px solid var(--line);padding:8px 10px}
.ek-code-io summary{cursor:pointer;font-size:.85rem;font-weight:600}
.ek-code-in{margin-top:8px;font:13px/1.4 Consolas,monospace;min-height:60px}
.ek-code-out{margin:0;padding:10px 12px;background:#0F1A30;color:#E7EBF3;font:13px/1.45 Consolas,monospace;max-height:260px;overflow:auto;border-top:1px solid var(--line);white-space:pre-wrap}
.ek-code-out .e{color:#FF8A80}.ek-code-out .st,.ek-code-out .fin{color:#8E9AB5;font-style:italic}
/* Instructions screen (before every test) */
.intro{max-width:760px;margin:28px auto;padding:0 16px 40px}
.intro-card{display:grid;gap:16px}
.intro-card h3{font:600 .8rem var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:6px 0 -6px}
.intro-facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px}
.intro-facts div{background:var(--surface-2);border-radius:12px;padding:12px 14px}
.intro-facts b{display:block;font-family:var(--serif);font-weight:400;font-size:1.5rem;line-height:1.2}
.intro-facts span{font-size:.82rem;color:var(--muted)}
.intro-instr{white-space:pre-wrap;margin:0;padding:12px 14px;border-left:3px solid var(--gold-2);background:var(--surface-2);border-radius:0 10px 10px 0}
.rules{margin:0;padding-left:1.2em;display:grid;gap:8px;line-height:1.5}
.rules .danger-rule{color:var(--bad)}
.agree{padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--bg);margin:0}
.intro-actions{display:flex;justify-content:flex-end;gap:10px;flex-wrap:wrap}
.intro-actions .btn{padding:.85em 1.4em}
/* Out of full screen: questions hidden behind a cover */
.exam-locked .exam-wrap{visibility:hidden}
.exam-cover{position:fixed;inset:0;z-index:150;background:rgba(5,12,26,.92);display:grid;place-items:center;padding:20px}
.exam-cover[hidden]{display:none}
.exam-cover .card{max-width:480px;text-align:center;display:grid;gap:6px;justify-items:center}
.exam-cover .card p{margin:4px 0}
.warn-cover{z-index:160}
.warn-ico{width:56px;height:56px;border-radius:50%;background:var(--bad-bg);color:var(--bad);display:grid;place-items:center;font:700 1.8rem var(--sans)}
#wOk{min-width:140px;margin-top:8px}