/* Unified answer workspace: preserve backend status, enhance presentation only. */
.study-workspace .core-study-grid{grid-template-columns:minmax(0,1fr) 14px var(--assistant-width,380px);gap:0}
.study-divider{align-self:stretch;cursor:col-resize;touch-action:none;display:flex;align-items:center;justify-content:center;min-height:140px;outline-offset:-2px}
.study-divider span{height:64px;width:3px;background:var(--learn-line);border-radius:5px;position:sticky;top:40vh}
.study-divider:hover span,.study-divider:focus-visible span{background:var(--learn-accent);box-shadow:0 0 10px var(--learn-accent)}
.study-resizing{cursor:col-resize;user-select:none}
body[data-learning-theme] .study-ai{height:calc(100dvh - 36px);max-height:1100px;position:sticky;top:18px;padding:22px;display:flex;flex-direction:column;gap:14px;overflow:hidden}
.study-ai .ai-messages{flex:1;min-height:180px;max-height:none;overflow:auto;padding:2px 6px 4px 0;font-size:14px;line-height:1.9;overscroll-behavior:contain}
.study-ai .ai-message{padding:16px;margin-bottom:14px;border-radius:16px;overflow-wrap:anywhere}
.study-ai .ai-message small{display:block;font-size:11px;color:var(--learn-muted);margin-bottom:8px}
.study-ai .ai-compose{flex:none;margin:0}.study-ai .ai-compose textarea{min-height:80px;max-height:160px;padding:13px;font-size:14px;resize:vertical}
.study-ai .ai-compose .quiz-actions{margin:6px 0 0;padding:0;justify-content:flex-end}
.study-ai .quote-chip{max-height:165px;flex:none;overflow:auto;padding:13px;line-height:1.7;font-size:13px}
.study-ai .study-followups{flex:none;display:flex;flex-wrap:wrap;gap:7px}.study-followups>span{width:100%;font-size:11px;color:var(--learn-muted)}
.study-context{display:flex;flex-wrap:wrap;gap:7px;font-size:11px;color:var(--learn-muted)}
.study-context span{padding:4px 8px;border:1px solid var(--learn-line);border-radius:8px}.study-context small{width:100%;font-size:11px}
.study-ai-error{color:var(--learn-error-text);background:var(--learn-error-bg);padding:10px;border-radius:10px;font-size:12px}
.study-ai-error button{display:block;margin-top:6px;color:inherit;background:none;border:1px solid currentColor;border-radius:6px;padding:6px;cursor:pointer}
.study-ai #ai-status{margin:0;font-size:11px}.study-ai-heading{flex:none}.study-ai-tabs{flex:none}
body[data-learning-theme] .core-assistant{padding:23px}.core-assistant-welcome{padding:12px 0 18px}.core-lock-card{border-radius:18px}
.study-question-summary{padding:22px 24px}.study-question-summary .quiz-head{margin-bottom:12px;padding-bottom:12px}.study-question-summary .core-progress{margin-bottom:12px}
.study-question-summary .core-answer-instruction{margin:0 0 8px}.study-question-summary .quiz-stem{font-size:17px;line-height:1.85}
.study-answer-surface:has(.ink-workspace){padding:0;overflow:hidden}
.ink-workspace{padding:20px;min-width:0}.ink-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:18px}.ink-heading h3{font-size:19px;margin:0 0 5px}.ink-heading p{font-size:11px;color:var(--learn-muted);margin:0}
.ink-workspace button{font:inherit;font-size:12px;color:var(--learn-text);background:var(--learn-field);border:1px solid var(--learn-line);padding:9px 11px;border-radius:9px;cursor:pointer;min-height:40px}
.ink-workspace button:hover{border-color:var(--learn-accent)}.ink-workspace button[aria-pressed=true]{color:var(--learn-accent);background:var(--learn-selected);border-color:var(--learn-accent)}.ink-workspace button:disabled{opacity:.45;cursor:default}
.ink-modes{display:flex;gap:5px;padding:4px;border-radius:13px;background:var(--learn-raised)}
.ink-toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:7px;padding:10px;border:1px solid var(--learn-line);border-radius:12px 12px 0 0;background:var(--learn-raised)}
.ink-toolbar label{display:flex;gap:6px;align-items:center;font-size:11px;color:var(--learn-muted)}.ink-toolbar input[type=color]{border:0;background:none;width:30px;height:30px;padding:0}.ink-toolbar input[type=range]{width:65px;accent-color:var(--learn-accent)}
.ink-desk{display:grid;grid-template-columns:72px minmax(0,1fr);border:1px solid var(--learn-line);border-top:0;border-radius:0 0 12px 12px;overflow:hidden;min-width:0}
.ink-pages{padding:8px 5px;background:var(--learn-raised);display:flex;gap:9px;flex-direction:column;overflow:auto;max-height:650px}.ink-pages button{padding:4px;font-size:10px;flex:none}.ink-thumb{display:block;width:100%;height:auto;background:white;border-radius:4px;margin-bottom:4px}
.ink-paper{position:relative;min-width:0;background-color:#fff;background-image:radial-gradient(#c3d4e4 .65px,transparent .85px);background-size:20px 20px}
#ink-canvas{display:block;width:100%;height:auto;aspect-ratio:3/2;min-height:410px;touch-action:none;cursor:crosshair;user-select:none}
.ink-placeholder{position:absolute;inset:0;display:flex;gap:12px;align-items:center;justify-content:center;flex-direction:column;color:#7895b0;pointer-events:none;font-size:28px}.ink-placeholder b{font-size:16px;font-weight:500}.ink-placeholder span{font-size:12px}.ink-placeholder.hidden{display:none}
.ink-page-footer{display:flex;justify-content:space-between;align-items:center;gap:10px;padding-top:12px;font-size:11px;color:var(--learn-muted)}
.ink-save-status{font-size:11px;color:var(--learn-muted);margin:13px 0 0;line-height:1.6}
.ink-text label{display:block;margin-bottom:12px;font-size:13px}.ink-text textarea{width:100%;min-height:380px;background:var(--learn-field);border:1px solid var(--learn-line);color:var(--learn-text);padding:18px;line-height:1.9;font-size:16px;border-radius:12px;resize:vertical}.ink-text p,.ink-photos p{font-size:12px;color:var(--learn-muted)}
.ink-upload{padding:24px;border:1px dashed var(--learn-accent);border-radius:14px;display:block;color:var(--learn-accent);cursor:pointer;text-align:center}.ink-upload input{display:block;margin:15px auto 0;max-width:100%}
.ink-photo-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.ink-photo-list figure{margin:0}.ink-photo-list img{width:100%;max-height:260px;object-fit:contain;background:white;border-radius:10px}
.study-answer-surface:has(.ink-workspace)>.quiz-actions{margin:0;padding:15px 20px;border-top:1px solid var(--learn-line)}.study-answer-surface:has(.ink-workspace)>p{padding:0 20px 12px;font-size:12px}
body.ink-is-fullscreen{overflow:hidden}.ink-workspace.ink-fullscreen{position:fixed;inset:12px;z-index:2000;background:var(--learn-surface);border:1px solid var(--learn-line);border-radius:20px;overflow:auto;box-shadow:0 0 0 20px #000b}
.ink-fullscreen .ink-desk{max-width:1400px;margin:auto}.ink-fullscreen #ink-canvas{height:calc(100dvh - 245px);min-height:350px;max-height:900px}.ink-fullscreen .ink-paper{background:white}.ink-fullscreen .ink-toolbar{position:sticky;top:-20px;z-index:1}
body[data-learning-theme] .core-study-grid .quiz-answer .opt.study-option-correct{background:var(--learn-success-bg);border-color:var(--learn-success-text)}
body[data-learning-theme] .core-study-grid .quiz-answer .opt.study-option-wrong{background:var(--learn-error-bg);border-color:var(--learn-error-text)}
.study-feedback{margin:20px 0;padding:20px}.study-my-answer h3,.study-analysis h3{font-size:18px}.study-analysis .analysis{font-size:16px;line-height:1.9}.analysis-step{margin:12px 0}.analysis-step summary{padding:12px;cursor:pointer;min-height:44px}
.study-answer-images{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.study-my-answer .submitted-text{font-size:16px;line-height:1.9}.study-standard{font-size:16px}
@media(max-width:1100px){.study-workspace .core-study-grid{grid-template-columns:minmax(0,1fr);gap:20px}.study-divider{display:none}body[data-learning-theme] .study-ai{position:static;height:760px;max-height:none}.ink-toolbar{gap:6px}.ink-workspace{padding:16px}.core-assistant{display:block}.core-assistant-welcome{display:block}}
@media(prefers-reduced-motion:reduce){.study-intelligence em{animation:none}}
/* Keep geometry and ink at their true aspect ratio as columns resize. */
#ink-canvas{min-height:0;height:auto;aspect-ratio:3/2}
.ink-fullscreen #ink-canvas{height:auto;min-height:0;max-height:none}
.ink-fullscreen .ink-desk{max-width:min(1400px,calc((100dvh - 260px)*1.5 + 72px))}
.study-question-summary .quiz-head{display:grid;grid-template-columns:minmax(0,1fr) auto;column-gap:15px;align-items:start}
.study-question-summary .quiz-head>div:first-child{grid-column:1;grid-row:1/span 2}
.study-question-summary .quiz-head>.study-status-pill{grid-column:2;justify-self:end}
.study-question-summary .quiz-head>.core-progress{grid-column:2;margin:8px 0 0;justify-self:end;white-space:nowrap}
.study-question-summary .quiz-head .core-progress-track{display:none}
body[data-learning-theme]{--scene-panel:#fffffff8;--scene-aside:#f8fcfff9}
body[data-learning-theme=dark]{--scene-panel:#081b30f7;--scene-aside:#0a2039f7}