/* Real Class 10 and 12 attempts: handwriting, product grading, then a visitor's try. */
#walkthrough .demo-tabs{position:relative;isolation:isolate}
#walkthrough .demo-tabs [data-feedback-tab-label]{font:inherit}
#walkthrough .demo-tabs [aria-selected=true]:after{content:none}
#walkthrough .demo-tabs button{position:relative;z-index:1;min-height:58px;padding:6px 6px 10px;align-items:flex-start;gap:3px;transition:color .55s cubic-bezier(.22,1,.36,1)}
#walkthrough .demo-tabs button>b{font-weight:500;font-size:.8125rem;line-height:1.35}
#walkthrough .demo-tabs [aria-selected=true]>b{font-weight:600;color:var(--ink)}
#walkthrough .tab-beat{position:relative;display:grid;place-items:center;width:28px;height:28px;flex-shrink:0;margin-bottom:1px;font-size:inherit;letter-spacing:0;color:inherit}
#walkthrough .tab-ring{position:absolute;inset:0;width:28px;height:28px;overflow:visible}
#walkthrough .tab-ring-track,#walkthrough .tab-ring-fill{fill:none;stroke-width:1.7}
#walkthrough .tab-ring-track{stroke:#eeebea}
#walkthrough .tab-ring-fill{stroke:var(--ink);stroke-linecap:round;stroke-dasharray:84.8;stroke-dashoffset:84.8}
#walkthrough .tab-num{position:relative;z-index:1;font-style:normal;font-size:.625rem;letter-spacing:.06em;font-weight:600;color:#968d88;line-height:1}
#walkthrough .demo-tabs [aria-selected=true] .tab-num{color:var(--ink)}
#walkthrough .demo-tabs.is-guided .tab-ring-track{stroke:#eae4e1}
#walkthrough .demo-tabs.is-guided [aria-selected=true] .tab-ring-fill{animation:tab-ring-spin var(--tab-dwell,4.2s) linear forwards}
#walkthrough .demo-tabs.is-guided.is-fill-paused [aria-selected=true] .tab-ring-fill{animation-play-state:paused}
#walkthrough .demo-tabs .is-loop-done .tab-beat{background:#f1efee;border-radius:50%}
#walkthrough .demo-tabs .is-loop-done .tab-ring{opacity:0}
#walkthrough .demo-tabs .is-loop-done .tab-num{color:var(--ink)}
#walkthrough .demo-tabs .is-arriving .tab-beat{animation:tab-arrive .52s cubic-bezier(.22,1,.36,1)}
#walkthrough .demo-tab-indicator{position:absolute;left:0;top:4px;bottom:5px;z-index:0;height:auto;width:var(--tab-indicator-w,72px);transform:translateX(var(--tab-indicator-x,0));background:linear-gradient(180deg,#f6f4f3,#f3f1f0);border-radius:11px;box-shadow:inset 0 0 0 1px #edebe9,0 6px 16px #3b25180a;pointer-events:none;transition:transform .82s cubic-bezier(.22,1,.36,1),width .82s cubic-bezier(.22,1,.36,1)}
#walkthrough .demo-tabs.is-guided .demo-tab-indicator{box-shadow:inset 0 0 0 1px #eae4e1,0 8px 20px #3b251812}
#walkthrough .tab-spark{position:absolute;z-index:3;width:8px;height:8px;border-radius:50%;background:var(--ink);box-shadow:0 0 0 5px #edeae9,0 0 18px #ba8a6e;opacity:0;pointer-events:none;left:18px;top:14px}
#walkthrough .demo-panel{position:relative}
#walkthrough .demo-panel[data-real-answer="true"]{min-height:515px;transition:min-height .75s cubic-bezier(.22,1,.36,1)}
#walkthrough .demo-panel.is-swapping{overflow:hidden}
#walkthrough .demo-card{transition:box-shadow .7s ease,transform .7s cubic-bezier(.22,1,.36,1)}
#walkthrough .demo-card.is-guided{box-shadow:0 16px 38px #3b251814,0 0 0 1px #edeae9}
#walkthrough .demo-card.is-step-changing{box-shadow:0 18px 40px #3b251818;transform:translateY(-2px)}
#walkthrough .walkthrough-content{animation:none}
#walkthrough .walkthrough-leave{position:absolute;left:0;right:0;top:0;z-index:0;pointer-events:none;animation:walkthrough-leave .62s cubic-bezier(.4,0,.2,1) forwards;transform-origin:30% 40%}
#walkthrough .walkthrough-enter{position:relative;z-index:1;animation:walkthrough-enter .82s cubic-bezier(.22,1,.36,1) .1s both;transform-origin:70% 50%}
#walkthrough .leave-forward{--walk-out:-26px;--walk-rot:-.35deg}
#walkthrough .leave-back{--walk-out:26px;--walk-rot:.35deg}
#walkthrough .enter-forward{--walk-in:28px;--walk-rot:.3deg}
#walkthrough .enter-back{--walk-in:-28px;--walk-rot:-.3deg}
@keyframes walkthrough-enter{from{opacity:0;transform:translateX(var(--walk-in,28px)) translateY(8px) rotate(var(--walk-rot,.3deg));filter:blur(5px)}to{opacity:1;transform:none;filter:none}}
@keyframes walkthrough-leave{to{opacity:0;transform:translateX(var(--walk-out,-24px)) translateY(-6px) rotate(var(--walk-rot,-.35deg));filter:blur(4px)}}
@keyframes tab-ring-spin{to{stroke-dashoffset:0}}
@keyframes tab-arrive{0%{transform:scale(.94)}58%{transform:scale(1.04)}100%{transform:scale(1)}}
.real-answer-content{min-width:0}
.real-answer-meta{flex-wrap:wrap;row-gap:4px}
.answer-proof-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 0 13px}
.answer-proof-heading h3{font-family:var(--serif);font-weight:400;font-size:1.5rem;letter-spacing:-.035em;line-height:1.25;margin:0}
.answer-proof-heading h3 em,.real-answer-content .walkthrough-progress-title em{color:#7c6151}
.vedora-grade{flex:0 0 auto;text-align:center;background:#f4f3f2;border:1px solid #efedeb;border-radius:6px;padding:7px 9px}
.vedora-grade>span{display:block;font-size:.5625rem;letter-spacing:.07em;font-weight:600;color:#765b4b;line-height:1.4}
.vedora-grade strong{display:block;font-family:var(--serif);font-size:1.8rem;font-weight:500;line-height:1.3;color:var(--ink)}
.vedora-grade strong span{font-size:1rem;color:#8a7264;font-weight:400}
.answer-sheet-proof{margin:0;border:1px solid #efedec;border-radius:5px;overflow:hidden;background:#f7f6f6}
.source-sheet-window{display:block;position:relative;aspect-ratio:2.55;overflow:hidden;background:#f6f5f4}
.source-sheet-image-layer{position:absolute;inset:0 0 auto;display:block;aspect-ratio:1326/912;transform:translateY(-31.8%)}
.source-sheet-window img{display:block;width:100%;height:100%}
.source-sheet-annotation{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.source-sheet-window:hover .source-slip-ring{stroke-width:5}
.answer-sheet-proof figcaption{display:flex;justify-content:space-between;gap:9px;align-items:center;padding:7px 10px;font-size:.6875rem;color:#7a685d;border-top:1px solid #f1f0ee;line-height:1.5}
.answer-sheet-proof figcaption a{font-weight:500;flex-shrink:0;color:var(--ink)}
.answer-source-links{display:flex;flex-wrap:wrap;gap:6px 17px;margin:9px 0 12px;font-size:.75rem;line-height:1.5;color:#6d5a4f}
.answer-source-links a{text-decoration:underline;text-decoration-color:#eae4e1;text-underline-offset:3px}
.answer-source-links a:hover,.answer-sheet-proof figcaption a:hover{color:var(--ink);text-decoration-color:var(--ink)}
.real-answer-feedback{padding:12px 13px;background:#f5f3f2;border-left:2px solid #a7846f;border-radius:0 5px 5px 0}
.real-feedback-label{display:block;font-size:.625rem;letter-spacing:.07em;font-weight:600;color:#765e50;margin-bottom:4px}
.real-feedback-heading{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 10px}
.real-feedback-heading strong{font-size:.875rem;line-height:1.5}
.real-feedback-heading>span{font-size:.625rem;color:#765e50;white-space:nowrap}
.real-answer-feedback>p{font-size:.8125rem;line-height:1.55;color:#6d5e55;margin:4px 0 0}
.corrected-distance.math{font-size:1.0625rem;line-height:1.55;margin-top:7px;overflow-wrap:anywhere}
.real-answer-content mark{background:#edeae9;color:var(--ink);padding:0 3px;border-radius:3px}
.answer-grading-details{margin-top:10px;border-bottom:1px solid #f0eeed}
.answer-grading-details summary{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:7px 0;font-size:.75rem;font-weight:500;line-height:1.6;list-style:none;cursor:pointer}
.answer-grading-details summary::-webkit-details-marker{display:none}
.answer-grading-details summary>span{font-size:1.1rem;font-weight:400;color:#826757;transition:transform .18s}
.answer-grading-details[open] summary>span{transform:rotate(45deg)}
.answer-grading-body{font-size:.8125rem;line-height:1.65;color:#71625a;padding:7px 0 15px}
.answer-grading-body h4{font-size:.8125rem;font-weight:600;color:var(--ink);margin:14px 0 5px}
.answer-grading-body p{margin:0}
.answer-grading-body ul{padding-left:18px;margin:0;display:grid;gap:4px}
.answer-grading-body .grading-summary{padding-left:10px;border-left:2px solid #bfa292}
.answer-grading-body .grading-math{font-family:var(--serif);font-style:italic;color:var(--ink);line-height:1.8;margin-bottom:7px}
.practice-hint{display:flex;align-items:center;justify-content:space-between;gap:8px 16px;flex-wrap:wrap;padding:9px 12px;margin:2px 0 16px;background:#f4f3f2;border:1px solid #f1efed;border-radius:6px}
.practice-hint>span{font-size:.625rem;letter-spacing:.08em;font-weight:600;color:#7d604f;text-transform:uppercase}
.practice-hint .math{font-size:1.0625rem;line-height:1.4;margin:0}
.practice-prompt{margin:0 0 14px}
.practice-prompt .distance-practice-question{margin-top:6px;font-size:1rem;line-height:1.55}
.distance-practice-question{font-size:.9375rem;line-height:1.65;margin-top:8px}
.distance-practice-question strong{font-family:var(--serif);font-weight:500;white-space:nowrap}
#walkthrough .real-answer-options{margin-top:0}
#walkthrough .real-answer-options .answer-choice{min-height:48px;padding:11px 12px;font-family:var(--serif);font-style:italic;font-size:1rem;gap:10px}
.choice-letter{display:grid;place-items:center;width:23px;height:23px;flex-shrink:0;font-family:var(--sans);font-style:normal;font-size:.6875rem;border:1px solid #eeebea;border-radius:50%;color:#775c4d}
.real-answer-options [aria-checked=true] .choice-letter{background:var(--ink);border-color:var(--ink);color:#fff}
.choice-result{font-family:var(--sans);font-style:normal;font-size:.8125rem;color:#745f53;margin-left:.45em;white-space:nowrap}
.practise-actions{margin-top:2px}
.practise-stagger{animation:practise-rise .62s cubic-bezier(.22,1,.36,1) both;animation-delay:calc(.12s + var(--stagger,0)*90ms)}
.practise-stagger[data-stagger="1"]{--stagger:0}
.practise-stagger[data-stagger="2"]{--stagger:1}
.practise-stagger[data-stagger="3"]{--stagger:2}
.practise-stagger[data-stagger="4"]{--stagger:3}
@keyframes practise-rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.real-answer-content .practice-result{min-height:0}
.real-answer-content .practice-result:empty{margin:0}
.real-answer-content .practice-timeline{margin-top:8px}
#walkthrough .practice-timeline li{padding-bottom:16px;gap:10px}
.real-answer-content .practice-timeline + .demo-next{margin-top:20px}
.source-sheet-window:focus-visible{outline-offset:-4px}
.class12-sheet-window{aspect-ratio:944/320}
.class12-sheet-window .source-sheet-image-layer{aspect-ratio:944/574;transform:none}
.grading-preview-caption{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:5px 12px;margin-bottom:7px;font-family:var(--sans);color:#6e5c51;font-size:.625rem;letter-spacing:.03em;line-height:1.5}
.grading-preview-caption a{font-size:.6875rem;font-weight:500;letter-spacing:0;text-decoration:underline;text-decoration-color:#eae4e1;text-underline-offset:3px}
.grading-correction{padding:10px 0 0}
.grading-correction>span{font-size:.625rem;letter-spacing:.06em;font-weight:500;color:#846e62}
.grading-correction .corrected-distance{margin-top:4px}
.grading-source-report{display:inline-block;margin-top:12px;color:#3b2518;text-decoration:underline;text-underline-offset:3px}
.class12-practice-equation.math{font-size:1.25rem;line-height:1.5;margin:0;overflow-wrap:anywhere}
@media(min-width:681px) and (max-width:900px){
  .answer-proof-heading{gap:7px;align-items:flex-start}
  .answer-proof-heading h3{font-size:1.25rem}
  .vedora-grade{padding:6px}
  .vedora-grade>span{font-size:.5rem;letter-spacing:0}
  .vedora-grade strong{font-size:1.5rem}
  .source-sheet-window{aspect-ratio:2.1}
  .class12-sheet-window{aspect-ratio:944/340}
  .real-answer-meta{font-size:.6875rem}
  .real-feedback-heading strong{font-size:.8125rem}
  .real-answer-feedback{padding:10px}
  .corrected-distance.math{font-size:.9375rem}
  .answer-sheet-proof figcaption{padding:6px;font-size:.625rem}
  .practice-hint{padding:8px 10px}
  .practice-hint .math{font-size:1rem}
  #walkthrough .real-answer-options .answer-choice{font-size:.875rem;gap:7px;padding-inline:8px}
}
@media(max-width:680px){
  #walkthrough .demo-panel[data-real-answer="true"]{min-height:510px}
  .answer-proof-heading h3{font-size:1.5rem}
  .answer-sheet-proof figcaption,.answer-source-links{font-size:.75rem}
  .real-answer-meta{font-size:.6875rem}
}
@media(max-width:390px){
  .answer-proof-heading h3{font-size:1.25rem}
  .vedora-grade{padding-inline:7px}
  .source-sheet-window{aspect-ratio:2.2}
  .class12-sheet-window{aspect-ratio:944/340}
  .answer-sheet-proof figcaption,.answer-source-links{font-size:.6875rem}
  .real-answer-feedback{padding:10px}
  .corrected-distance.math{font-size:1rem}
  #walkthrough .demo-tabs button{font-size:.8125rem}
}
@media(prefers-reduced-motion:reduce){
  .answer-grading-details summary>span{transition:none}
  #walkthrough .demo-tab-indicator,#walkthrough .demo-panel[data-real-answer="true"],#walkthrough .demo-card,#walkthrough .demo-tabs button,.tab-spark{transition:none}
  #walkthrough .walkthrough-enter,#walkthrough .walkthrough-leave,.practise-stagger,#walkthrough .demo-tabs.is-guided [aria-selected=true] .tab-ring-fill,#walkthrough .demo-tabs .is-arriving .tab-beat{animation:none}
  #walkthrough .demo-card.is-step-changing,#walkthrough .demo-card.is-guided{box-shadow:none;transform:none}
  #walkthrough .tab-spark{opacity:0}
}