:root{--learning-blue:#1e54d8}
.question-stem{font-size:17px;line-height:1.95}
.option{display:flex;align-items:center;gap:16px;min-height:60px;font-size:16px;line-height:1.75;padding:14px 18px}
.option-letter{width:32px;height:32px;min-width:32px;display:grid;place-items:center;font-size:16px;font-weight:600;border:1px solid #c4c8c9;border-radius:6px;color:var(--ink);background:#f5f5f2}
.option-text{flex:1;min-width:0}
.option-selected{display:grid;place-items:center;width:20px;flex:none;color:var(--learning-blue);visibility:hidden}
.option.chosen{border-color:var(--learning-blue);background:#f4f7ff}
.option.chosen .option-letter{background:var(--learning-blue);border-color:var(--learning-blue);color:white}
.option.chosen .option-selected{visibility:visible}
.option:focus-within{outline:2px solid var(--learning-blue);outline-offset:3px}
.answer-field>label,.short-answer-label{font-size:14px;line-height:1.7}
.unit-input input{font-size:16px}
.unit-input select{font-size:13px}
.tolerance-note{font-size:13px;color:var(--muted);margin-bottom:17px}
.nav-topic+.nav-topic{margin-top:20px}
.nav-topic h3{font-size:13px;font-weight:500;color:var(--muted);margin:0 0 9px}
.question-map a{min-height:58px}
.question-aside .aside-block:first-child{padding-top:0}
.field-results>div{font-size:14px}
.field-results p{font-size:14px;line-height:1.8}
.correct-fields{font-size:14px;color:var(--muted)}
.numeric-details{margin:18px 0;font-size:14px;border-top:1px solid var(--line)}
.numeric-details>summary{padding:14px 0;cursor:pointer}
.numeric-details>div{padding:12px 0;border-top:1px solid var(--line)}
.numeric-details p{font-size:13px;line-height:1.8;color:var(--muted);margin:4px 0}
.explanation-body,.explanation ol{font-size:15px;line-height:1.9}
.explanation-body h3{font-size:14px}
.feedback-actions{margin-top:24px}
.feedback{scroll-margin-top:120px}
.learning-resources{margin:28px 0 4px;padding-top:20px;border-top:1px solid var(--line)}
.learning-resources h3{font-size:13px;font-weight:500;color:var(--muted);margin:0 0 10px}
.learning-resources>div{display:flex;flex-wrap:wrap;gap:8px 24px}
.resource-link{display:inline-flex;align-items:center;gap:8px;min-height:40px;font-size:14px;color:var(--learning-blue);text-decoration:none}
.resource-link .icon{width:15px;height:15px}
.resource-link:hover{text-decoration:underline}
.course-followup{border:1px solid var(--line);border-radius:10px;background:white;padding:24px 28px;display:flex;align-items:center;gap:30px;margin:25px 0}
.course-followup>div{flex:1}
.course-followup h2{font-size:20px;margin:6px 0 10px}
.course-followup p:not(.eyebrow){font-size:14px;line-height:1.85;color:var(--muted);margin:0}
.course-followup .button{white-space:nowrap}
.knowledge-changes{margin:24px 0;font-size:14px}
.knowledge-changes h2{font-size:20px}
.knowledge-changes>p{font-size:13px;color:var(--muted)}
.knowledge-changes table{width:100%;border-collapse:collapse;margin-top:15px}
.knowledge-changes th,.knowledge-changes td{text-align:left;padding:12px 8px;border-bottom:1px solid var(--line);line-height:1.8}
.knowledge-changes th{font-weight:500;color:var(--muted)}
.profile-hero{background:#f4f6fa;border-color:#d9dfe8}
.profile-hero:before{background:var(--learning-blue)}
.profile-tagline,.profile-kicker,.profile-conclusion{color:#424e60}
.portrait-ray{stroke:var(--learning-blue)}
.profile-copy,.portrait-orbit,.portrait-lens,.portrait-ray,.portrait-focus,.dimension-track>span{animation-duration:.4s;animation-delay:0s}
.portrait-ray.secondary,.portrait-orbit.inner{animation-delay:.05s;animation-duration:.35s}
.profile-stats span,.profile-footnote,.profile-conclusion{font-size:14px}
.profile-stats strong{font-size:27px}
.profile-stats>div{gap:10px}
.profile-topline .eyebrow{font-size:14px;letter-spacing:1px}
@media(max-width:700px){
 .topbar{position:sticky;top:0;z-index:5;background:var(--paper)}
 .question-stem{font-size:16px}
 .option{font-size:16px;min-height:60px;padding:13px 12px;gap:12px}
 .option-letter{width:32px;height:32px;min-width:32px;font-size:16px}
 .option-selected{width:16px}
 .answer-field>label{font-size:14px}
 .feedback-actions .button{min-height:48px;font-size:14px}
 .field-results>div,.field-results p,.feedback>p{font-size:14px}
 .explanation-body,.explanation ol{font-size:14px}
 .source-details{font-size:12px;line-height:1.9}
 .source-details summary{font-size:13px}
 .course-followup{display:block;padding:21px}
 .course-followup .button{margin-top:18px;white-space:normal}
 .profile-copy h1{font-size:30px}
 .profile-conclusion{font-size:14px}
 .profile-art{grid-row:auto;max-width:160px}
 .profile-stats span{font-size:12px}
 .profile-footnote{font-size:12px}
 .knowledge-changes{font-size:12px}
 .knowledge-changes th,.knowledge-changes td{padding:9px 5px}
 .session-navigation{display:grid;grid-template-columns:1fr;gap:16px}
 .nav-topic+.nav-topic{margin:0}
 .learning-resources>div{gap:4px 18px}
}
@media(prefers-reduced-motion:reduce){
 .profile-copy,.portrait-orbit,.portrait-lens,.portrait-ray,.portrait-focus,.dimension-track>span{animation:none}
}