/* Fixed reading, answer and action regions. Content never sizes the frame. */
body.is-quiz{background:#edf2f7}
.exam-shell{width:100%;max-width:1040px;grid-template-rows:56px 3px minmax(0,1fr) calc(80px + env(safe-area-inset-bottom,0px));border:0}
.exam-topbar{padding:0 16px;gap:10px}.exam-topbar .back-button{background:#f0f4f8;border-radius:13px;flex:0 0 44px}.exam-topbar strong{font-size:14px}.exam-topbar small{font-size:11px}.exam-count{font-size:20px;font-variant-numeric:tabular-nums;color:var(--ink)}.exam-count small{font-size:13px}
.exam-stage{grid-template-rows:36% minmax(0,1fr);grid-template-columns:minmax(0,1fr)}
.exam-question-pane{position:relative;background:#f3f7fb;border-color:#e0e8ef;scrollbar-gutter:auto}
.exam-question-content,.exam-question-content:has(.question-visual){display:block;padding:14px 20px}
.exam-question-content[hidden]{display:none!important}
.exam-question-content .question-title{font-family:var(--display);font-size:20px;line-height:1.3;font-weight:650;letter-spacing:-.025em;margin:0;overflow-wrap:anywhere}
.exam-question-content .question-visual{height:144px;min-height:0;margin:10px 0 0;padding:0;background:none;border:0;display:block}
.question-image-button{height:100%;width:100%;position:relative;display:grid;grid-template-rows:minmax(0,1fr);grid-template-columns:minmax(0,1fr);place-items:center;border:0;background:transparent;border-radius:14px;padding:0;color:var(--link);cursor:zoom-in}
.exam-question-content .question-visual img{height:100%;width:100%;min-height:0;max-width:100%;max-height:100%;object-fit:contain}
.image-enlarge{position:absolute;right:0;bottom:0;display:flex;align-items:center;gap:4px;padding:7px 8px;border:1px solid #dbe6ef;background:#fffffff2;border-radius:9px;font-size:11px;color:#365e7d}
.image-enlarge .icon{width:15px;height:15px}
.exam-answer-pane{padding:10px 16px;scrollbar-gutter:auto;background:white;overflow-y:auto;overscroll-behavior:contain}
.exam-answer-pane .answers{height:100%;min-height:416px;grid-template-rows:repeat(4,minmax(0,1fr));gap:8px;margin:0}
.exam-answer-pane .answer-option{position:relative;display:grid;grid-template-columns:28px minmax(0,1fr);grid-template-rows:auto;align-content:safe center;align-items:center;gap:10px;height:100%;min-height:0;max-height:100%;padding:7px 10px;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;border:2px solid #dce4eb;border-radius:15px;background:#fff;color:var(--ink);font-family:var(--display);font-size:17px;line-height:1.3;text-align:left;transition:border-color .12s,background .12s;touch-action:pan-y}
.exam-answer-pane .answer-copy{font-size:inherit;line-height:inherit;overflow-wrap:anywhere;min-width:0}
.exam-answer-pane .answer-letter{height:28px;width:28px;flex:none;border:0;border-radius:9px;background:#edf2f7;color:#486174;font-size:13px;font-weight:700}
.exam-answer-pane .answer-letter .icon{height:18px;width:18px}
.exam-answer-pane .answer-option.is-selected,.exam-answer-pane .answer-option.is-correct,.exam-answer-pane .answer-option.is-incorrect{padding:7px 10px;border-width:2px;box-shadow:none}
.exam-answer-pane .answer-option.is-selected{border-color:#1d70b8;background:#eef6fd}.exam-answer-pane .answer-option.is-selected .answer-letter{background:#1d70b8;color:white}
.exam-answer-pane .answer-option.is-correct{border-color:#087b56;background:#eff9f4;color:#17543d}.exam-answer-pane .answer-option.is-correct .answer-letter{background:#087b56;color:white}
.exam-answer-pane .answer-option.is-incorrect{border-color:#b32d35;background:#fff3f2;color:#88282e}.exam-answer-pane .answer-option.is-incorrect .answer-letter{background:#b32d35;color:white}
.exam-answer-pane .answer-option[aria-disabled=true]{cursor:default}.exam-answer-pane .answer-option[aria-disabled=true]:hover{border-color:#dce4eb;background:#fff}.exam-answer-pane .answer-option.is-correct:hover{border-color:#087b56;background:#eff9f4}.exam-answer-pane .answer-option.is-incorrect:hover{border-color:#b32d35;background:#fff3f2}
.exam-answer-pane .answer-option.has-overflow{background-image:linear-gradient(to top,#e8eff680,transparent 9px);background-attachment:local}
.exam-footer{grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);gap:12px;padding:12px 16px calc(12px + env(safe-area-inset-bottom,0px));border-top:1px solid #e0e7ee;background:#fff;box-shadow:0 -3px 16px #1b3b5e06}
.exam-footer .btn{height:52px;min-height:52px;padding:10px 12px;border:0;border-radius:14px;font-size:16px;line-height:1.2;gap:7px;transition:background .12s;transform:none}
.exam-hint{font-size:12px;line-height:1.4;color:#597080}.explanation-toggle{min-height:48px;font-size:14px;font-weight:600;text-decoration:none;gap:6px}.explanation-toggle .icon{height:16px;width:16px}
.exam-question-pane .exam-feedback{position:absolute;inset:0;height:100%;max-height:none;border:0;border-left:4px solid var(--green);border-radius:0;box-shadow:none;background:#f0f8f4;display:flex;flex-direction:column;overflow:hidden}
.exam-question-pane .exam-feedback.is-error{border-color:#b32d35;background:#fff7f4}
.feedback-top{padding:10px 12px 6px 16px;flex:none;gap:10px;align-items:center}.feedback-kicker{font-size:9px;font-weight:750;letter-spacing:.1em;color:#49695b;margin:0 0 4px}.is-error .feedback-kicker{color:#93564b}.feedback-top h2{font-size:21px;line-height:1.2;margin:0;letter-spacing:-.025em}.feedback-close{width:44px;min-width:44px;height:44px;padding:10px;background:#ffffffb3;border-radius:12px;color:#35576b}.feedback-close .icon{width:21px;height:21px}.feedback-scroll{padding:0 18px 16px;overflow:auto;min-height:0}.feedback-scroll p{font-size:16px;line-height:1.45;margin:0 0 10px}.feedback-scroll .correct-answer-text{font-size:14px;font-weight:650}.feedback-scroll .review-hint{font-size:12px;color:#75544d}.feedback-scroll .source-details{padding-top:0;margin-top:12px}.feedback-scroll .source-details summary{font-size:13px;min-height:44px;padding:12px 0}.feedback-scroll .source-details a{display:inline-flex;min-height:44px;align-items:center;font-size:13px}
#question-image-dialog{width:min(720px,calc(100% - 24px));max-width:none;max-height:calc(100dvh - 24px);margin:auto;padding:16px;border:0;border-radius:22px;background:#fff;color:var(--ink);box-shadow:0 25px 100px #041d3c40;overflow:auto}
#question-image-dialog::backdrop{background:#0c1e31b3;backdrop-filter:blur(3px)}.image-dialog-header{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:14px}.image-dialog-header h2{font-size:18px;margin:0}.image-dialog-art{height:min(65dvh,550px);min-height:160px;display:grid;grid-template-rows:minmax(0,1fr);grid-template-columns:minmax(0,1fr);place-items:center;background:#f5f8fa;border-radius:15px;padding:12px}.image-dialog-art img{width:100%;height:100%;object-fit:contain;max-height:100%}
.mini-sign-set{display:flex;flex-direction:column;align-items:stretch;gap:12px;padding:16px!important;border:1px solid var(--line)}.mini-sign-set>div{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;align-items:center;padding:8px 0}.mini-sign-set img{width:100%;height:48px;object-fit:contain}.mini-sign-set .text-link{display:flex;justify-content:center;align-items:center;gap:8px;min-height:46px;border:0;border-radius:12px;background:#edf5fc;font-size:15px;color:var(--link)}
@media(max-width:359px){.exam-question-content,.exam-question-content:has(.question-visual){padding:12px 16px}.exam-question-content .question-title{font-size:19px}.exam-answer-pane{padding-inline:12px}.exam-answer-pane .answer-option{font-size:17px;gap:8px;padding-inline:8px}.exam-answer-pane .answer-option.is-selected,.exam-answer-pane .answer-option.is-correct,.exam-answer-pane .answer-option.is-incorrect{padding-inline:8px}.exam-footer{padding-inline:12px;gap:8px}.exam-footer .btn{font-size:15px;padding-inline:8px}.mini-sign-set>div{gap:3px}.mini-sign-set img{height:40px}}
@media(min-width:900px),(min-width:640px) and (max-height:600px){.exam-stage{grid-template-columns:minmax(0,1fr) minmax(0,1.08fr);grid-template-rows:minmax(0,1fr)}.exam-question-pane{border-bottom:0;border-right:1px solid #e0e8ef}.exam-question-content,.exam-question-content:has(.question-visual){padding:28px}.exam-question-content .question-title{font-size:25px;line-height:1.35}.exam-question-content .question-visual{height:260px;margin-top:30px}.exam-answer-pane{padding:20px}.exam-answer-pane .answers{gap:12px;min-height:440px}.exam-answer-pane .answer-option{padding:14px;font-size:18px;grid-template-columns:32px minmax(0,1fr);gap:13px}.exam-answer-pane .answer-option.is-selected,.exam-answer-pane .answer-option.is-correct,.exam-answer-pane .answer-option.is-incorrect{padding:14px}.exam-answer-pane .answer-letter{width:32px;height:32px;font-size:14px}.feedback-top{padding:24px 20px 14px 24px}.feedback-top h2{font-size:26px}.feedback-scroll{padding:0 26px 26px}.feedback-scroll p{font-size:18px}.feedback-scroll .correct-answer-text{font-size:16px}.exam-footer{grid-template-columns:1fr 250px;padding-inline:24px}.exam-hint,.explanation-toggle{font-size:15px}}
@media(min-width:900px) and (min-height:601px){body.is-quiz #app{display:grid;place-items:center;padding:24px}.exam-shell{height:min(900px,calc(100dvh - 48px));border-radius:24px;border:1px solid #dce5ed;overflow:hidden;grid-template-rows:64px 3px minmax(0,1fr) calc(84px + env(safe-area-inset-bottom,0px))}.exam-topbar{padding-inline:22px}.exam-topbar strong{font-size:16px}.exam-topbar small{font-size:12px}.mini-sign-set{flex-direction:row;align-items:center}.mini-sign-set>div{flex:1;max-width:510px}.mini-sign-set img{height:58px}.mini-sign-set .text-link{min-width:210px;padding-inline:20px}}
@media(min-width:640px) and (max-height:600px){.exam-question-content,.exam-question-content:has(.question-visual){padding:16px 20px}.exam-question-content .question-title{font-size:20px}.exam-question-content .question-visual{height:144px;margin-top:14px}.feedback-top{padding:10px 14px 8px}.feedback-scroll{padding:0 18px 18px}}
@media(prefers-reduced-motion:reduce){.exam-answer-pane .answer-option,.exam-footer .btn{transition:none}}
/* A compact phone keeps the full sign alongside the stem, within the same frame. */
@media(max-width:639px) and (max-height:700px){
 .exam-question-content:has(.question-visual){display:grid;grid-template-columns:minmax(0,1fr) 130px;gap:12px;align-items:start;padding:12px}
 .exam-question-content:has(.question-visual) .question-title{font-size:18px;line-height:1.3;grid-column:1;grid-row:1}
 .exam-question-content:has(.question-visual) .question-visual{grid-column:2;grid-row:1;height:130px;margin:0}
 .image-enlarge{padding:5px 6px;font-size:10px;bottom:0;right:0}
}