.tr-hero{padding-top:clamp(64px,7vw,100px);padding-bottom:clamp(40px,4.5vw,64px)}.tr-hero h1{font-family:var(--font-display);font-weight:400;font-size:clamp(34px,4.8vw,64px);line-height:1.12;margin:16px 0 0}.tr-lead{max-width:62ch;margin:20px 0 0;color:var(--color-text-dim);font-size:clamp(16px,1.5vw,19px);line-height:1.6}.tr-hero-meta{margin-top:24px;font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--color-slate)}.tr-series-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}.tr-series-card{display:block;padding:28px;background:var(--color-card);border:1px solid var(--color-line);border-radius:var(--radius-card);transition:border-color .18s ease,transform .18s ease}.tr-series-card:hover{border-color:#0cbfaa66;transform:translateY(-2px)}.tr-series-card:focus-visible{outline:2px solid var(--color-teal);outline-offset:3px}.tr-series-card h2{font-family:var(--font-display);font-weight:400;font-size:24px;margin:14px 0 10px}.tr-series-card p{margin:0;color:var(--color-text-dim);font-size:15px;line-height:1.6}.tr-series-card .tr-count{display:block;margin-top:18px;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--color-teal)}.tr-lesson-list{display:flex;flex-direction:column;gap:12px}.tr-lesson-row{display:flex;align-items:center;gap:20px;padding:20px 24px;background:var(--color-card);border:1px solid var(--color-line);border-radius:var(--radius-card);transition:border-color .18s ease,transform .18s ease}.tr-lesson-row:hover{border-color:#0cbfaa66;transform:translate(2px)}.tr-lesson-row:focus-visible{outline:2px solid var(--color-teal);outline-offset:3px}.tr-lesson-num{flex:none;width:40px;height:40px;display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-size:16px;color:var(--color-teal);background:var(--color-teal-soft);border-radius:50%}.tr-lesson-body{flex:1;min-width:0}.tr-lesson-title{font-family:var(--font-display);font-weight:400;font-size:18px;color:var(--color-fog);margin:0 0 4px}.tr-lesson-goal{margin:0;font-size:14px;color:var(--color-text-dim);line-height:1.5}.tr-lesson-row .arr{flex:none;color:var(--color-slate);transition:transform .18s ease}.tr-lesson-row:hover .arr{transform:translate(3px);color:var(--color-teal)}.tr-detail-hero{padding-top:clamp(40px,5vw,72px);padding-bottom:clamp(24px,3vw,40px)}.tr-detail-hero h1{font-family:var(--font-display);font-weight:400;font-size:clamp(30px,4vw,52px);line-height:1.15;margin:14px 0 0}.tr-goal-callout{margin:22px 0 0;padding:18px 22px;max-width:68ch;background:var(--color-card);border:1px solid var(--color-line);border-left:2px solid var(--color-teal);border-radius:var(--radius-card)}.tr-goal-label{display:block;font-size:11px;font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:var(--color-teal);margin-bottom:6px}.tr-goal-callout p{margin:0;font-size:16px;line-height:1.6;color:var(--color-fog)}.tr-body{padding-top:clamp(32px,4vw,56px);padding-bottom:clamp(56px,6vw,96px)}.tr-prose{max-width:74ch}.tr-prose h2{font-family:var(--font-display);font-weight:400;font-size:clamp(22px,2.6vw,30px);line-height:1.25;margin:44px 0 16px}.tr-prose>h2:first-child{margin-top:0}.tr-prose h3{font-family:var(--font-display);font-weight:400;font-size:clamp(18px,1.9vw,21px);margin:30px 0 12px}.tr-prose p{margin:0 0 18px;color:var(--color-text-dim);line-height:1.72}.tr-prose strong{color:var(--color-fog);font-weight:500}.tr-prose ul,.tr-prose ol{margin:0 0 20px;padding-left:22px;color:var(--color-text-dim)}.tr-prose li{margin-bottom:12px;line-height:1.68}.tr-prose li::marker{color:var(--color-teal)}.tr-prose a{color:var(--color-teal);text-decoration:underline;text-underline-offset:3px;text-decoration-color:#0cbfaa66}.tr-prose a:hover{text-decoration-color:var(--color-teal)}.tr-prose a:focus-visible{outline:2px solid var(--color-teal);outline-offset:2px;border-radius:2px}.tr-quiz{margin-top:56px;padding-top:40px;border-top:1px solid var(--color-line)}.tr-quiz-head{margin-bottom:28px}.tr-quiz-head h2{margin:12px 0 8px}.tr-quiz-note{margin:0;max-width:60ch;font-size:14px;color:var(--color-slate);line-height:1.6}.tr-quiz-q{margin-bottom:32px}.tr-quiz-q:last-of-type{margin-bottom:0}.tr-quiz-question{margin:0 0 14px;font-size:16px;font-weight:500;color:var(--color-fog);line-height:1.5}.tr-quiz-options{display:flex;flex-direction:column;gap:10px}.tr-quiz-opt{text-align:left;padding:14px 18px;font-family:var(--font-body);font-size:15px;line-height:1.5;color:var(--color-fog);background:var(--color-card-2);border:1px solid var(--color-line);border-radius:var(--radius-card);transition:border-color .15s ease,background-color .15s ease}.tr-quiz-opt:not(:disabled):hover{border-color:#0cbfaa66}.tr-quiz-opt:focus-visible{outline:2px solid var(--color-teal);outline-offset:2px}.tr-quiz-opt:disabled{cursor:default}.tr-quiz-opt.is-correct{border-color:#4ade8080;background:var(--color-green-soft);color:var(--color-green)}.tr-quiz-opt.is-incorrect{border-color:#f8717180;background:var(--color-error-soft);color:var(--color-error)}.tr-quiz-explain{margin:14px 0 0;padding-left:14px;border-left:2px solid rgba(12,191,170,.35);font-size:14px;line-height:1.6;color:var(--color-text-dim)}.tr-quiz-result[hidden]{display:none}.tr-quiz-result{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-top:32px;padding:20px 24px;background:var(--color-card);border:1px solid var(--color-line);border-radius:var(--radius-card)}.tr-quiz-score{margin:0;font-family:var(--font-display);font-size:18px;color:var(--color-fog)}.tr-lesson-nav{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:48px;padding-top:24px;border-top:1px solid var(--color-line)}.tr-nav-link{display:flex;flex-direction:column;gap:4px;max-width:320px;padding:16px 20px;background:var(--color-card);border:1px solid var(--color-line);border-radius:var(--radius-card);transition:border-color .18s ease}.tr-nav-link:hover{border-color:#0cbfaa66}.tr-nav-link:focus-visible{outline:2px solid var(--color-teal);outline-offset:3px}.tr-nav-link.tr-next{margin-left:auto;text-align:right;align-items:flex-end}.tr-nav-dir{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--color-slate)}.tr-nav-title{font-family:var(--font-display);font-size:15px;color:var(--color-fog)}@media(prefers-reduced-motion:reduce){.tr-series-card,.tr-lesson-row,.tr-nav-link,.tr-lesson-row .arr,.tr-quiz-opt{transition:none}.tr-series-card:hover,.tr-lesson-row:hover,.tr-lesson-row:hover .arr{transform:none}}