/* =========================================================
   APEX AeroSafety Solutions — Knowledge Check
   Extends styles.css without modifying the main site styles.
   ========================================================= */

[hidden]{display:none!important}

.sr-only{
  position:absolute!important;
  width:1px!important;
  height:1px!important;
  padding:0!important;
  margin:-1px!important;
  overflow:hidden!important;
  clip:rect(0,0,0,0)!important;
  white-space:nowrap!important;
  border:0!important;
}

.viewer-top{
  position:sticky;
  top:0;
  z-index:70;
  background:rgba(3,15,24,.94);
  backdrop-filter:blur(15px);
  border-bottom:1px solid var(--line);
}

.viewer-top .progress{
  width:100%;
  height:4px;
  overflow:hidden;
  background:rgba(255,255,255,.08);
}

.viewer-top .progress i{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--green));
  box-shadow:0 0 16px rgba(70,215,255,.48);
  transition:width .35s ease;
}

.viewer-row{
  min-height:74px;
  display:flex;
  align-items:center;
  gap:18px;
}

.viewer-row .chapter-title{
  flex:1;
  font-size:1rem;
  letter-spacing:.02em;
}

.viewer-row .brand{
  flex:0 0 auto;
}

.viewer-row .logo{
  width:42px;
  height:42px;
}

.quiz-main{
  min-height:calc(100vh - 151px);
  padding:72px 0 92px;
  background:
    radial-gradient(circle at 78% 16%,rgba(70,215,255,.13),transparent 28%),
    radial-gradient(circle at 18% 80%,rgba(103,215,165,.08),transparent 26%),
    linear-gradient(180deg,#04131e,#020a10);
}

.quiz-main::before{
  content:"";
  position:fixed;
  inset:74px 0 0;
  pointer-events:none;
  opacity:.16;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:52px 52px;
  mask-image:linear-gradient(to bottom,#000,transparent 88%);
}

.quiz-container{
  position:relative;
  z-index:2;
  width:min(960px,92vw);
}

.quiz-panel{
  padding:clamp(26px,5vw,54px);
  border:1px solid rgba(255,255,255,.13);
  border-radius:26px;
  background:linear-gradient(145deg,rgba(14,59,84,.96),rgba(5,27,41,.98));
  box-shadow:0 28px 80px rgba(0,0,0,.34);
}

.quiz-panel h1{
  max-width:900px;
  margin:15px 0 22px;
  font-size:clamp(2.2rem,5.5vw,4.4rem);
  line-height:1.02;
}

.quiz-panel .lead{
  max-width:820px;
}

.quiz-meta{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:14px;
  margin:34px 0 26px;
}

.quiz-meta div{
  min-height:112px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:7px;
  padding:19px;
  text-align:center;
  border:1px solid var(--line);
  border-radius:17px;
  background:rgba(255,255,255,.035);
}

.quiz-meta strong{
  color:#fff;
  font-size:1.36rem;
}

.quiz-meta span{
  color:var(--muted);
  font-size:.84rem;
  font-weight:750;
  letter-spacing:.04em;
  text-transform:uppercase;
}

.notice,
.quiz-notice{
  padding:18px 20px;
  color:#d9edf5;
  line-height:1.65;
  border:1px solid rgba(70,215,255,.25);
  border-left:4px solid var(--cyan);
  border-radius:14px;
  background:rgba(70,215,255,.075);
}

.quiz-actions{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:13px;
  flex-wrap:wrap;
  margin-top:30px;
}

.quiz-question-head{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  gap:26px;
  align-items:start;
  margin-bottom:29px;
}

.quiz-question-head h1{
  margin-bottom:0;
  font-size:clamp(1.25rem,2.3vw,1.75rem);
  letter-spacing:-.035em;
}

.score-chip{
  min-width:102px;
  padding:11px 14px;
  text-align:center;
  color:#a9efff;
  font-weight:850;
  border:1px solid rgba(70,215,255,.3);
  border-radius:999px;
  background:rgba(70,215,255,.08);
}

.quiz-options{
  display:grid;
  gap:13px;
  min-width:0;
  margin:0;
  padding:0;
  border:0;
}

.quiz-option{
  position:relative;
  display:grid;
  grid-template-columns:44px minmax(0,1fr);
  align-items:center;
  gap:16px;
  min-height:76px;
  padding:15px 18px;
  cursor:pointer;
  border:1px solid rgba(255,255,255,.14);
  border-radius:17px;
  background:rgba(255,255,255,.035);
  transition:transform .18s ease,border-color .18s ease,background .18s ease,box-shadow .18s ease;
}

.quiz-option:hover{
  transform:translateY(-2px);
  border-color:rgba(70,215,255,.55);
  background:rgba(70,215,255,.065);
}

.quiz-option input{
  position:absolute;
  opacity:0;
  pointer-events:none;
}

.option-letter{
  width:42px;
  height:42px;
  display:grid;
  place-items:center;
  flex:0 0 auto;
  color:#bcefff;
  font-weight:900;
  border:1px solid rgba(70,215,255,.34);
  border-radius:12px;
  background:rgba(70,215,255,.08);
}

.option-text{
  color:#edf8fc;
  font-size:1.04rem;
  line-height:1.5;
}

.quiz-option:has(input:checked){
  border-color:var(--cyan);
  background:rgba(70,215,255,.11);
  box-shadow:0 0 0 3px rgba(70,215,255,.08);
}

.quiz-option:has(input:focus-visible){
  outline:3px solid rgba(141,234,255,.5);
  outline-offset:3px;
}

.quiz-option:has(input:checked) .option-letter{
  color:#03131d;
  border-color:transparent;
  background:linear-gradient(135deg,#8deaff,#20c3ed);
}

.quiz-option.is-correct{
  border-color:rgba(103,215,165,.8);
  background:rgba(103,215,165,.12);
}

.quiz-option.is-correct .option-letter{
  color:#041a12;
  border-color:transparent;
  background:var(--green);
}

.quiz-option.is-incorrect{
  border-color:rgba(255,132,132,.74);
  background:rgba(255,100,100,.09);
}

.quiz-option.is-incorrect .option-letter{
  color:#2b0808;
  border-color:transparent;
  background:#ff9a9a;
}

.quiz-option.is-disabled{
  cursor:default;
}

.quiz-option.is-disabled:hover{
  transform:none;
}

.quiz-message{
  margin:15px 0 0;
  color:#ffd4d4;
  font-weight:750;
}

.quiz-feedback{
  margin-top:32px;
  padding-top:30px;
  border-top:1px solid var(--line);
}

.feedback-status{
  display:inline-flex;
  align-items:center;
  min-height:35px;
  padding:7px 12px;
  margin-bottom:15px;
  border-radius:999px;
  font-size:.8rem;
  font-weight:900;
  letter-spacing:.1em;
  text-transform:uppercase;
}

.feedback-status.correct{
  color:#a9f2ce;
  background:rgba(103,215,165,.12);
  border:1px solid rgba(103,215,165,.28);
}

.feedback-status.incorrect{
  color:#ffd0d0;
  background:rgba(255,112,112,.1);
  border:1px solid rgba(255,132,132,.25);
}

.quiz-feedback h2{
  margin-bottom:14px;
  font-size:clamp(1.65rem,3vw,2.45rem);
}

.quiz-feedback > p{
  max-width:840px;
  color:var(--muted);
  font-size:1.03rem;
  line-height:1.75;
}

.takeaway-box{
  margin-top:23px;
  padding:20px 22px;
  border:1px solid rgba(245,198,93,.28);
  border-left:4px solid var(--gold);
  border-radius:15px;
  background:rgba(245,198,93,.075);
}

.takeaway-box strong{
  display:block;
  margin-bottom:7px;
  color:#ffe39a;
  font-size:.78rem;
  letter-spacing:.12em;
  text-transform:uppercase;
}

.takeaway-box p{
  margin:0;
  color:#f8edcf;
  line-height:1.65;
}

.result-score{
  width:min(320px,100%);
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:195px;
  margin:34px 0;
  padding:25px;
  text-align:center;
  border:1px solid rgba(70,215,255,.28);
  border-radius:24px;
  background:radial-gradient(circle at center,rgba(70,215,255,.13),rgba(255,255,255,.025));
  box-shadow:inset 0 0 45px rgba(70,215,255,.04);
}

.result-score strong{
  color:#9eeeff;
  font-size:clamp(3.7rem,9vw,6rem);
  line-height:1;
  letter-spacing:-.055em;
}

.result-score span{
  color:var(--muted);
  font-weight:750;
}

#resultScreen h2{
  margin:0 0 12px;
  font-size:clamp(1.65rem,3.4vw,2.55rem);
}

#loadingState{
  min-height:260px;
  display:grid;
  place-items:center;
  text-align:center;
}

#loadingState p::before{
  content:"";
  display:block;
  width:38px;
  height:38px;
  margin:0 auto 18px;
  border:3px solid rgba(255,255,255,.14);
  border-top-color:var(--cyan);
  border-radius:50%;
  animation:quiz-spin .8s linear infinite;
}

@keyframes quiz-spin{to{transform:rotate(360deg)}}

.quiz-panel .btn:disabled{
  opacity:.52;
  cursor:not-allowed;
  filter:saturate(.45);
}

@media(max-width:720px){
  .quiz-main{padding:44px 0 70px}
  .quiz-panel{border-radius:20px;padding:25px 20px}
  .quiz-meta{grid-template-columns:1fr}
  .quiz-meta div{min-height:88px}
  .quiz-question-head{grid-template-columns:1fr;gap:16px}
  .score-chip{justify-self:start}
  .quiz-option{grid-template-columns:38px minmax(0,1fr);gap:13px;padding:14px}
  .option-letter{width:38px;height:38px}
  .quiz-actions{justify-content:stretch}
  .quiz-actions .btn{width:100%}
  .viewer-row{gap:12px}
  .viewer-row .muted{font-size:.84rem}
}

@media(max-width:480px){
  .viewer-row .chapter-title{display:none}
  .viewer-row .muted{margin-left:auto}
  .quiz-panel h1{font-size:2rem}
  .quiz-question-head h1{font-size:1.2rem}
  .option-text{font-size:.98rem}
}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{
    scroll-behavior:auto!important;
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
  }
}