/* Quiz stage — the screen students see while taking a quiz or exam.
   Blue medical-training look: gradient banner, timer + progress cards, question
   navigator on the left, one question at a time with A/B/C/D options. */
.qs{--qs-blue:#1d4ed8;--qs-blue-2:#3b82f6;--qs-navy:#0f2a6b;--qs-ink:#1a2b5f;--qs-teal:#1cc7a8;--qs-green:#22c55e;--qs-grey:#cbd5e1;
 display:flex;flex-direction:column;gap:14px;width:100%;min-height:100%;box-sizing:border-box;padding:0 0 24px;
 font-family:inherit;animation:qsIn .5s ease both}
@keyframes qsIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.qs *{box-sizing:border-box}
.qs button{font:inherit}

/* ---- banner -------------------------------------------------------------- */
.qs-top{position:relative;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:22px;min-height:88px;padding:12px 18px 12px 20px;
 color:#fff;background:linear-gradient(90deg,#0b2a7a 0%,#1748c4 35%,#2f7bf2 70%,#52a8ff 100%);
 border-radius:0 0 22px 22px;box-shadow:0 10px 30px rgba(23,72,196,.28);overflow:hidden}
.qs-top::after{content:'';position:absolute;inset:0;background:radial-gradient(120% 140% at 100% 0,rgba(255,255,255,.18),transparent 55%);pointer-events:none}
.qs-brand{display:flex;align-items:center;gap:12px;position:relative;z-index:1}
.qs-brand-ico{width:50px;height:50px;border-radius:12px;background:linear-gradient(135deg,#ffc53d,#ff9f1c);display:grid;place-items:center;box-shadow:0 6px 16px rgba(0,0,0,.25);animation:qsFloat 3.6s ease-in-out infinite}
.qs-brand-ico svg{width:28px;height:28px;stroke:#1a2b5f;fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.qs-brand strong{display:block;font-size:17px;letter-spacing:.3px;text-transform:uppercase;line-height:1.15}
.qs-brand small{display:block;font-size:12px;opacity:.85;letter-spacing:.6px;text-transform:uppercase}
.qs-title{display:flex;align-items:center;gap:14px;position:relative;z-index:1;min-width:0}
.qs-title-ico{width:52px;height:52px;border-radius:14px;background:#fff;color:#1748c4;display:grid;place-items:center;box-shadow:0 8px 18px rgba(0,0,0,.22);flex-shrink:0;animation:qsFloat 3.6s ease-in-out .6s infinite}
.qs-title-ico svg{width:30px;height:30px;stroke:#1748c4;fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.qs-title h1{margin:0;font-size:clamp(18px,2.4vw,27px);font-weight:900;letter-spacing:.2px;line-height:1.1;text-shadow:0 2px 8px rgba(0,0,0,.25);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.qs-title h1 em{font-style:normal;color:#ffd166}
.qs-count{display:inline-block;margin-top:5px;padding:3px 12px;border-radius:999px;background:#fff;color:#1748c4;font-size:12px;font-weight:800}
.qs-ecg{position:absolute;left:52%;right:21%;top:50%;height:46px;transform:translateY(-50%);opacity:.9;pointer-events:none;z-index:0}
.qs-ecg svg{width:100%;height:100%}
.qs-ecg path{fill:none;stroke:#8ff5ff;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:420;stroke-dashoffset:420;animation:qsEcg 3.2s linear infinite;filter:drop-shadow(0 0 4px rgba(143,245,255,.9))}
@keyframes qsEcg{to{stroke-dashoffset:-420}}
@keyframes qsFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-3px)}}
@media(max-width:900px){.qs-ecg{display:none}}

/* camera preview in the banner (only when the exam uses the camera) */
.qs-cam{position:relative;z-index:1;width:200px;height:118px;border-radius:14px;border:3px solid #fff;background:#0b1c45;box-shadow:0 10px 24px rgba(0,0,0,.35);overflow:hidden;flex-shrink:0;justify-self:end;animation:qsPop .6s cubic-bezier(.2,.9,.3,1.2) both}
.qs-cam .exam-cam{position:static!important;left:auto!important;top:auto!important;width:100%!important;height:100%!important;opacity:1!important;pointer-events:none}
.qs-cam .exam-cam video{width:100%;height:100%;object-fit:cover;transform:scaleX(-1)}
.qs-cam-tag{position:absolute;left:10px;bottom:8px;display:flex;align-items:center;gap:6px;padding:3px 10px;border-radius:999px;background:rgba(0,0,0,.55);font-size:12px;font-weight:700}
.qs-cam-tag::before{content:'';width:8px;height:8px;border-radius:50%;background:#22c55e;box-shadow:0 0 0 0 rgba(34,197,94,.7);animation:qsPulse 1.6s infinite}
@keyframes qsPulse{70%{box-shadow:0 0 0 7px rgba(34,197,94,0)}100%{box-shadow:0 0 0 0 rgba(34,197,94,0)}}
@keyframes qsPop{from{opacity:0;transform:scale(.8)}to{opacity:1;transform:none}}
.qs-top.no-cam{grid-template-columns:auto 1fr}
.qs-top.no-cam .qs-ecg{right:4%}

/* ---- body ---------------------------------------------------------------- */
.qs-body{display:grid;grid-template-columns:190px 1fr;gap:16px;padding:0 18px;align-items:start}
@media(max-width:760px){.qs-body{grid-template-columns:1fr}.qs-side{order:2}}
.qs-side{background:#fff;border-radius:16px;box-shadow:0 8px 24px rgba(23,72,196,.10);overflow:hidden;position:sticky;top:8px}
.qs-side-head{display:flex;align-items:center;gap:9px;padding:12px 14px;color:#fff;font-weight:800;font-size:15px;background:linear-gradient(90deg,#1748c4,#2f7bf2)}
.qs-side-head svg{width:18px;height:18px;stroke:#fff;fill:none;stroke-width:2.4;stroke-linecap:round}
.qs-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:14px 14px 6px}
.qs-dot{width:40px;height:40px;border-radius:50%;border:2px solid #d9dee9;background:#eef1f7;color:#1a2b5f;font-weight:800;font-size:15px;display:grid;place-items:center;cursor:pointer;transition:transform .18s,background .25s,border-color .25s,box-shadow .25s;margin:0 auto}
.qs-dot:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(23,72,196,.18)}
.qs-dot.is-done{background:#22c55e;border-color:#16a34a;color:#fff}
.qs-dot.is-current{background:#1d4ed8;border-color:#1d4ed8;color:#fff;box-shadow:0 0 0 4px rgba(29,78,216,.18);animation:qsCurrent 1.8s ease-in-out infinite}
@keyframes qsCurrent{0%,100%{box-shadow:0 0 0 4px rgba(29,78,216,.18)}50%{box-shadow:0 0 0 7px rgba(29,78,216,.08)}}
.qs-legend{list-style:none;margin:0;padding:10px 16px 16px;font-size:12px;color:#334155;display:flex;flex-direction:column;gap:6px}
.qs-legend li{display:flex;align-items:center;gap:8px}
.qs-legend i{width:12px;height:12px;border-radius:50%;background:#cbd5e1;flex-shrink:0}
.qs-legend .cur i{background:#1d4ed8}.qs-legend .done i{background:#22c55e}

.qs-main{display:flex;flex-direction:column;gap:14px;min-width:0}
.qs-stats{display:grid;grid-template-columns:minmax(220px,300px) 1fr;gap:14px}
@media(max-width:620px){.qs-stats{grid-template-columns:1fr}}
.qs-timer{display:flex;align-items:center;gap:14px;padding:14px 20px;border-radius:16px;color:#fff;background:linear-gradient(135deg,#0ea5a0,#16a34a);box-shadow:0 10px 24px rgba(22,163,74,.28);transition:background .4s}
.qs-timer svg{width:36px;height:36px;stroke:#fff;fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.qs-timer strong{font-size:38px;font-weight:900;letter-spacing:1px;line-height:1;font-variant-numeric:tabular-nums}
.qs-timer span{font-size:15px;font-weight:800;opacity:.95;align-self:flex-end;margin-bottom:6px}
.qs-timer.is-late{background:linear-gradient(135deg,#ef4444,#b91c1c);box-shadow:0 10px 24px rgba(239,68,68,.35);animation:qsLate 1s ease-in-out infinite}
@keyframes qsLate{50%{transform:scale(1.02)}}
.qs-timer.is-free strong{font-size:22px}
.qs-progress{display:flex;align-items:center;gap:16px;padding:12px 18px;border-radius:16px;background:#fff;box-shadow:0 8px 24px rgba(23,72,196,.10)}
.qs-progress .grow{flex:1;min-width:0}
.qs-progress b{display:block;color:#1a2b5f;font-size:15px;margin-bottom:8px}
.qs-bar{height:9px;border-radius:999px;background:#e5eaf3;overflow:hidden}
.qs-bar i{display:block;height:100%;width:0;border-radius:999px;background:linear-gradient(90deg,#1cc7a8,#22c55e);transition:width .5s cubic-bezier(.2,.8,.2,1)}
.qs-progress small{display:block;margin-top:7px;font-size:12px;color:#475569;font-weight:600}
.qs-ring{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:900;font-size:14px;background:conic-gradient(#22c55e var(--p,0%),#0f2a6b 0);position:relative;flex-shrink:0;transition:background .4s}
.qs-ring::before{content:'';position:absolute;inset:5px;border-radius:50%;background:#0f2a6b}
.qs-ring span{position:relative}

/* ---- question panel ------------------------------------------------------- */
.qs-form{display:block;padding:0;border:0;background:transparent}
.qs-q{display:flex;flex-direction:column;gap:12px;background:#fff;border-radius:18px;box-shadow:0 10px 30px rgba(23,72,196,.10);padding:12px 14px 16px;animation:qsSlide .35s ease both}
.qs-q[hidden]{display:none}
@keyframes qsSlide{from{opacity:0;transform:translateX(16px)}to{opacity:1;transform:none}}
.qs-q-head{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.qs-q-no{display:inline-flex;align-items:center;gap:10px;padding:6px 14px 6px 8px;border-radius:999px;background:#fff6dc;color:#1a2b5f;font-weight:800;font-size:15px}
.qs-q-no i{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,#ffc53d,#ff9f1c);color:#1a2b5f;font-style:normal;font-weight:900;display:grid;place-items:center;font-size:18px}
.qs-q-no em{font-style:normal;color:#d97706}
.qs-hint{display:inline-flex;align-items:center;gap:7px;padding:6px 14px;border-radius:999px;background:#eef3ff;color:#334155;font-size:13px;font-weight:600}
.qs-hint svg{width:16px;height:16px;stroke:#f59e0b;fill:#fde68a;stroke-width:2}
.qs-q-title{display:flex;align-items:center;gap:16px;padding:16px 20px;border-radius:14px;background:linear-gradient(90deg,#e4eeff,#eef4ff);border:1px solid #d6e2fb}
.qs-q-ico{width:52px;height:52px;border-radius:14px;flex-shrink:0;background:linear-gradient(135deg,#3b82f6,#1d4ed8);display:grid;place-items:center;box-shadow:0 8px 18px rgba(29,78,216,.3)}
.qs-q-ico svg{width:30px;height:30px;stroke:#fff;fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.qs-q-title h2{margin:0;font-size:clamp(17px,1.9vw,23px);font-weight:900;color:#1a2b5f;line-height:1.3}
.qs-options{display:flex;flex-direction:column;gap:10px}
.qs-opt{display:flex;align-items:center;gap:16px;padding:12px 16px;border-radius:14px;border:2px solid #e3e8f2;background:#fff;cursor:pointer;transition:border-color .2s,background .2s,transform .18s,box-shadow .2s;position:relative;animation:qsSlide .4s ease both}
.qs-opt:nth-child(2){animation-delay:.05s}.qs-opt:nth-child(3){animation-delay:.1s}.qs-opt:nth-child(4){animation-delay:.15s}.qs-opt:nth-child(5){animation-delay:.2s}
.qs-opt:hover{border-color:#93c5fd;background:#f6f9ff;transform:translateX(3px)}
.qs-opt input{position:absolute;opacity:0;width:0;height:0}
.qs-radio{width:24px;height:24px;border-radius:50%;border:2px solid #94a3b8;flex-shrink:0;display:grid;place-items:center;transition:border-color .2s}
.qs-radio::after{content:'';width:12px;height:12px;border-radius:50%;background:#1d4ed8;transform:scale(0);transition:transform .2s cubic-bezier(.2,.9,.3,1.4)}
.qs-letter{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;font-weight:900;font-size:17px;flex-shrink:0}
.qs-opt[data-l="A"] .qs-letter{background:#dbeafe;color:#1d4ed8}
.qs-opt[data-l="B"] .qs-letter{background:#fce7f3;color:#db2777}
.qs-opt[data-l="C"] .qs-letter{background:#dcfce7;color:#16a34a}
.qs-opt[data-l="D"] .qs-letter{background:#ede9fe;color:#7c3aed}
.qs-opt[data-l="E"] .qs-letter{background:#ffedd5;color:#ea580c}
.qs-opt[data-l="F"] .qs-letter{background:#cffafe;color:#0891b2}
.qs-opt .qs-text{flex:1;font-size:15.5px;color:#1e293b;font-weight:600;line-height:1.4}
.qs-opt.is-picked{border-color:#1d4ed8;background:#eff5ff;box-shadow:0 8px 20px rgba(29,78,216,.14)}
.qs-opt.is-picked .qs-radio{border-color:#1d4ed8}.qs-opt.is-picked .qs-radio::after{transform:scale(1)}
.qs-q textarea{width:100%;min-height:150px;border:2px solid #e3e8f2;border-radius:14px;padding:14px 16px;font:inherit;font-size:15px;resize:vertical;background:#fff}
.qs-q textarea:focus{outline:none;border-color:#1d4ed8;box-shadow:0 0 0 4px rgba(29,78,216,.12)}
.qs-nav{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:2px}
.qs-btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:12px;border:0;font-weight:800;font-size:15px;cursor:pointer;transition:transform .15s,box-shadow .2s,opacity .2s}
.qs-btn svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}
.qs-btn.prev{background:#e9edf5;color:#475569}
.qs-btn.prev:disabled{opacity:.45;cursor:default}
.qs-btn.next{background:linear-gradient(90deg,#1d4ed8,#2f7bf2);color:#fff;box-shadow:0 10px 24px rgba(29,78,216,.32)}
.qs-btn.next:hover,.qs-btn.submit:hover{transform:translateY(-2px)}
.qs-btn.submit{background:linear-gradient(90deg,#16a34a,#22c55e);color:#fff;box-shadow:0 10px 24px rgba(22,163,74,.32)}
.qs-note{margin:0;padding:0 4px;font-size:13px;color:#64748b;font-weight:600}

/* inside the player/dialog */
#viewer.exam-mode .cb-page.qs-page,.cb-page.qs-page{max-width:none;padding:0;min-height:100%;background:linear-gradient(180deg,#e8f1ff 0%,#eef2fb 45%,#e9ecf7 100%)}
.qs-page .cb-page-head{display:none}
.qs-page .cb-nav{display:none}
.qs-exit{display:flex;justify-content:flex-end;padding:0 18px}