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var(--sp-6);font-size:var(--text-sm);font-weight:600;border-radius:var(--radius-md);transition:all var(--transition-fast);white-space:nowrap;cursor:pointer;border:none}.btn-primary{background:linear-gradient(135deg,var(--amber-500),var(--amber-600));color:var(--slate-900);box-shadow:0 2px 8px #f59e0b4d}.btn-primary:hover{background:linear-gradient(135deg,var(--amber-400),var(--amber-500));transform:translateY(-1px)}.btn-secondary{background:var(--bg-elevated);color:var(--text-primary);border:1px solid var(--border-default)}.btn-secondary:hover{background:var(--bg-card-hover)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover{background:var(--bg-card);color:var(--text-primary)}.btn-success{background:linear-gradient(135deg,var(--emerald-500),var(--emerald-600));color:#fff}.btn-sm{padding:var(--sp-2) var(--sp-4);font-size:var(--text-xs)}.btn-lg{padding:var(--sp-4) var(--sp-8);font-size:var(--text-md)}.badge{display:inline-flex;align-items:center;gap:var(--sp-1);padding:2px var(--sp-3);font-size:var(--text-xs);font-weight:600;border-radius:var(--radius-full);background:var(--bg-elevated);color:var(--text-secondary)}.badge-amber{background:#f59e0b26;color:var(--amber-400)}.badge-emerald{background:#10b98126;color:var(--emerald-400)}.mode-toggle{display:inline-flex;align-items:center;gap:0;padding:2px;border:1px solid var(--border-subtle);border-radius:var(--radius-full);background:var(--bg-elevated)}.mode-seg{padding:3px var(--sp-3);font-size:var(--text-xs);font-weight:600;border-radius:var(--radius-full);border:none;background:transparent;color:var(--text-muted);cursor:pointer;transition:background var(--transition-fast),color var(--transition-fast);white-space:nowrap}.mode-seg:hover{color:var(--text-primary)}.mode-seg.is-active{background:#f59e0b2e;color:var(--amber-400)}.mode-seg:focus-visible{outline:2px solid var(--amber-400);outline-offset:1px}.cc-card{display:flex;align-items:flex-start;gap:var(--sp-4);padding:var(--sp-4) var(--sp-5);border:1px solid var(--border-subtle);border-radius:var(--radius-md);background:var(--bg-elevated);color:var(--text-primary);cursor:pointer;text-align:left;transition:border-color var(--transition-fast),background var(--transition-fast)}.cc-card:hover{border-color:var(--amber-400);background:var(--bg-elev-1)}.cc-card:focus-visible{outline:2px solid var(--amber-400);outline-offset:1px}.cc-icon{flex:0 0 auto;font-size:1.6rem;line-height:1;padding-top:2px}.cc-body{display:flex;flex-direction:column;gap:2px;flex:1 1 auto;min-width:0}.cc-body strong{font-size:var(--text-sm);font-weight:600}.cc-desc{font-size:var(--text-xs);color:var(--text-muted);line-height:1.4}.student-mode-banner{position:fixed;bottom:0;left:0;right:0;z-index:9000;display:flex;align-items:center;justify-content:center;gap:var(--sp-3);padding:6px var(--sp-4);background:#3b82f61f;border-top:1px solid rgba(59,130,246,.35);font-size:var(--text-xs);color:var(--text-primary)}.student-mode-banner-action{padding:2px 10px;font-size:var(--text-xs);font-weight:600;border:1px solid rgba(59,130,246,.5);border-radius:var(--radius-full);background:transparent;color:var(--text-primary);cursor:pointer}.student-mode-banner-action:hover{background:#3b82f62e}.student-mode-banner{flex-wrap:wrap;text-align:center}body:has(.student-mode-banner) .content-area{padding-bottom:5.5rem}@media(max-width:640px){body:has(.student-mode-banner) .content-area{padding-bottom:6.75rem}}.tabs{display:flex;gap:var(--sp-1);border-bottom:1px solid var(--border-subtle);margin-bottom:var(--sp-6)}.tab{padding:var(--sp-3) var(--sp-4);font-size:var(--text-sm);font-weight:500;color:var(--text-muted);border-bottom:2px solid transparent;transition:all var(--transition-fast);cursor:pointer;background:none;border-top:none;border-left:none;border-right:none}.tab:hover{color:var(--text-primary)}.tab.active{color:var(--amber-400);border-bottom-color:var(--amber-500)}.accordion{border:1px solid var(--border-subtle);border-radius:var(--radius-md);overflow:hidden}.accordion-item{border-bottom:1px solid var(--border-subtle)}.accordion-item:last-child{border-bottom:none}.accordion-trigger{display:flex;align-items:center;gap:var(--sp-3);width:100%;padding:var(--sp-4) var(--sp-5);font-size:var(--text-base);font-weight:600;color:var(--text-primary);background:var(--bg-card);text-align:left;transition:all var(--transition-fast)}.accordion-trigger:hover{background:var(--bg-card-hover)}.accordion-trigger .chevron{margin-left:auto;transition:transform var(--transition-fast)}.accordion-trigger.open .chevron{transform:rotate(180deg)}.accordion-body{max-height:0;overflow:hidden;transition:max-height var(--transition-slow)}.accordion-body.open{max-height:2000px}.accordion-content{padding:var(--sp-4) var(--sp-5)}.exercise-container{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);overflow:hidden;margin:var(--sp-6) 0}.exercise-header{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-4) var(--sp-6);background:linear-gradient(135deg,#f59e0b14,#f59e0b05);border-bottom:1px solid var(--border-subtle)}.exercise-type-icon{width:36px;height:36px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.1rem;background:var(--accent-glow)}.exercise-title{font-size:var(--text-md);font-weight:700;flex:1}.exercise-score{display:flex;align-items:center;gap:var(--sp-2);font-size:var(--text-sm);font-weight:600;color:var(--emerald-400)}.exercise-body{padding:var(--sp-6)}.exercise-footer{display:flex;align-items:center;justify-content:space-between;padding:var(--sp-4) var(--sp-6);border-top:1px solid var(--border-subtle);background:#0f172a66}.exercise-container[data-submitted="1"] .exercise-body{pointer-events:none;opacity:.85}.exercise-container[data-submitted="1"] .exercise-footer button:disabled{opacity:.55;cursor:not-allowed}.quiz-option{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-3) var(--sp-4);margin-bottom:var(--sp-2);border:1px solid var(--border-subtle);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.quiz-option:hover{border-color:var(--amber-500);background:var(--accent-glow)}.quiz-option.selected{border-color:var(--amber-500);background:#f59e0b1a}.quiz-option.correct{border-color:var(--emerald-500);background:#10b9811a}.quiz-option.incorrect{border-color:var(--rose-500);background:#f43f5e1a}.quiz-radio{width:18px;height:18px;border:2px solid var(--text-muted);border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.quiz-option.selected .quiz-radio{border-color:var(--amber-500)}.quiz-option.selected .quiz-radio:after{content:"";width:8px;height:8px;border-radius:50%;background:var(--amber-500)}.quiz-option.correct .quiz-radio{border-color:var(--emerald-500);background:var(--emerald-500)}.quiz-label{font-size:var(--text-sm);color:var(--text-primary);line-height:1.5}.quiz-multi .quiz-radio{border-radius:4px}.quiz-multi .quiz-option.selected .quiz-radio:after{border-radius:1px;width:10px;height:10px}.quiz-q-timer{margin:0 0 var(--sp-3);padding:6px 10px;background:#f59e0b0f;border:1px solid rgba(245,158,11,.18);border-radius:var(--radius-sm);display:flex;align-items:center;gap:var(--sp-3)}.quiz-q-timer-bar{flex:1;position:relative;height:4px;border-radius:2px;background:#ffffff0f;overflow:hidden}.quiz-q-timer-fill{display:block;height:100%;width:100%;background:linear-gradient(90deg,var(--amber-400, #fbbf24),var(--amber-500, #f59e0b));transition:width .25s linear}.quiz-q-timer-text{display:inline-flex;align-items:center;gap:4px;font-size:.75rem;font-weight:700;color:var(--amber-300, #fcd34d);font-variant-numeric:tabular-nums;white-space:nowrap}.quiz-q-timer-emoji{font-size:.95rem}.quiz-q-timer-low{background:#f43f5e1a;border-color:#f43f5e4d}.quiz-q-timer-low .quiz-q-timer-fill{background:linear-gradient(90deg,var(--rose-400, #fb7185),var(--rose-500, #f43f5e));animation:quiz-q-timer-pulse .5s ease-in-out infinite alternate}.quiz-q-timer-low .quiz-q-timer-text{color:var(--rose-300, #fda4af)}@keyframes quiz-q-timer-pulse{0%{opacity:.85}to{opacity:1}}.quiz-question-locked .quiz-option{pointer-events:none;opacity:.55}.quiz-question-locked .quiz-q-timer{background:#64748b1a;border-color:#64748b40}.quiz-question-locked .quiz-q-timer-fill{background:#64748b80}.quiz-question-locked .quiz-q-timer-text{color:var(--text-muted)}.quiz-question-locked .quiz-q-timer-text:after{content:" · time up";color:var(--rose-300, #fda4af);font-weight:600}.quiz-pre-start{padding:var(--sp-6);text-align:center;background:#f59e0b0a;border:1px dashed rgba(245,158,11,.3);border-radius:var(--radius-md)}.quiz-pre-start-ended{background:#94a3b80f;border-color:#94a3b84d;color:var(--text-muted)}.quiz-pre-start-ended .quiz-pre-start-icon{animation:none;opacity:.7}.quiz-pre-start p{margin:0 0 var(--sp-3)}.quiz-pre-start p:last-child{margin-bottom:0}.quiz-pre-start-icon{font-size:2.5rem;margin-bottom:var(--sp-3);opacity:.85;animation:quiz-pre-start-pulse 1.6s ease-in-out infinite}@keyframes quiz-pre-start-pulse{0%,to{transform:scale(1);opacity:.85}50%{transform:scale(1.08);opacity:1}}.quiz-start-btn{font-size:1rem;padding:var(--sp-3) var(--sp-6);margin:var(--sp-2) 0 var(--sp-3)}.quiz-question-seq{display:none}.quiz-question-seq.quiz-question-active{display:block;animation:quiz-q-slide-in .4s cubic-bezier(.22,.61,.36,1)}@keyframes quiz-q-slide-in{0%{opacity:0;transform:translate(36px) scale(.985)}to{opacity:1;transform:translate(0) scale(1)}}@media(prefers-reduced-motion:reduce){.quiz-question-seq.quiz-question-active{animation:none}}.quiz-q-progress{display:inline-block;margin-bottom:var(--sp-3);padding:2px 10px;font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--amber-300, #fcd34d);background:#f59e0b1a;border:1px solid rgba(245,158,11,.25);border-radius:var(--radius-full)}.quiz-q-controls{margin-top:var(--sp-4);padding-top:var(--sp-3);border-top:1px dashed var(--border-subtle);display:flex;justify-content:flex-end;gap:var(--sp-2)}.quiz-advance-btn,.quiz-q-submit-btn{min-width:110px}.exercise-container:has(.quiz-attempt-info[data-sequential="1"]) .exercise-footer button{display:none}.quiz-question-submitted .quiz-q-submit-btn{background:var(--bg-surface);color:var(--text-muted);border-color:var(--border-subtle)}.quiz-q-waiting{margin-left:var(--sp-2);font-size:.78rem;color:var(--text-muted);font-style:italic;align-self:center}.quiz-q-instructor-progress{justify-content:flex-start}.quiz-q-submit-progress{display:inline-flex;align-items:center;gap:4px;padding:4px 12px;font-size:.78rem;color:var(--text-muted);background:#64748b14;border:1px solid rgba(100,116,139,.2);border-radius:var(--radius-full);font-variant-numeric:tabular-nums}.quiz-q-submit-count{font-weight:700;color:var(--amber-300, #fcd34d)}.quiz-q-submit-total{color:var(--text-primary)}.quiz-podium-card{padding:var(--sp-6);text-align:center;background:linear-gradient(180deg,#f59e0b1a,#f59e0b05);border:1px solid rgba(245,158,11,.3);border-radius:var(--radius-lg)}.quiz-podium-title{font-size:1.5rem;font-weight:800;margin-bottom:var(--sp-4);background:linear-gradient(90deg,var(--amber-300, #fcd34d),var(--amber-500, #f59e0b));-webkit-background-clip:text;background-clip:text;color:transparent}.quiz-podium-list{display:flex;flex-direction:column;gap:var(--sp-2);max-width:460px;margin:0 auto}.quiz-podium-row{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:var(--sp-3);padding:var(--sp-3) var(--sp-4);border-radius:var(--radius-md);background:#ffffff08;border:1px solid var(--border-subtle)}.quiz-podium-row-1{background:#f59e0b1f;border-color:#f59e0b66;transform:scale(1.04)}.quiz-podium-row-2{background:#94a3b81a;border-color:#94a3b84d}.quiz-podium-row-3{background:#b453091a;border-color:#b453094d}.quiz-podium-medal{font-size:1.5rem}.quiz-podium-name{text-align:left;font-weight:600;color:var(--text-primary)}.quiz-podium-score{font-weight:700;font-variant-numeric:tabular-nums;color:var(--amber-300, #fcd34d)}.quiz-podium-mine{margin-top:var(--sp-4);padding:var(--sp-3);font-size:.9rem;color:var(--text-muted);background:#ffffff08;border-radius:var(--radius-md)}.pmf-fx-mute{position:fixed;right:var(--sp-4);bottom:var(--sp-4);z-index:1000;width:38px;height:38px;border-radius:50%;border:1px solid var(--border-default);background:var(--bg-surface);color:var(--text-primary);cursor:pointer;font-size:1.05rem;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-md);transition:transform var(--transition-fast),background var(--transition-fast)}.pmf-fx-mute:hover{transform:scale(1.08);background:var(--bg-elevated)}@media print{.pmf-fx-mute{display:none!important}}.quiz-streak-badge{display:inline-block;margin-left:6px;padding:2px 10px;font-weight:700;font-size:.75rem;color:var(--bg-app, #0f172a);background:linear-gradient(90deg,#fb7185,#f59e0b);border-radius:var(--radius-full);animation:streak-pop .4s ease-out}@keyframes streak-pop{0%{transform:scale(.8);opacity:0}60%{transform:scale(1.1);opacity:1}to{transform:scale(1)}}.quiz-question-revealing .quiz-option{position:relative;pointer-events:none;overflow:hidden}.quiz-question-revealing .quiz-option.correct{border-color:var(--emerald-500);background:#10b98114;animation:quiz-reveal-correct .6s ease-out}@keyframes quiz-reveal-correct{0%{transform:scale(1)}40%{transform:scale(1.025);box-shadow:0 0 0 4px #10b98133}to{transform:scale(1)}}.quiz-reveal-count{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:flex-end;padding-right:var(--sp-3);pointer-events:none;z-index:1}.quiz-reveal-bar{position:absolute;left:0;top:0;bottom:0;background:linear-gradient(90deg,#f59e0b2e,#f59e0b0f);z-index:0;animation:quiz-reveal-bar-grow .6s ease-out}.quiz-question-revealing .quiz-option.correct .quiz-reveal-bar{background:linear-gradient(90deg,#10b98147,#10b98114)}@keyframes quiz-reveal-bar-grow{0%{width:0!important}}.quiz-reveal-num{font-size:.75rem;font-weight:700;color:var(--text-primary);background:var(--bg-elevated);padding:2px 8px;border-radius:var(--radius-full);font-variant-numeric:tabular-nums;position:relative;z-index:2}.input{width:100%;padding:var(--sp-3) var(--sp-4);font-family:var(--font-sans);font-size:var(--text-sm);color:var(--text-primary);background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-md);transition:all var(--transition-fast)}.input:focus{outline:none;border-color:var(--amber-500);box-shadow:0 0 0 3px var(--accent-glow)}.input::placeholder{color:var(--text-muted)}textarea.input{min-height:100px;resize:vertical;line-height:1.6}textarea.kp-field{min-height:2.25rem;resize:none;overflow:hidden;line-height:1.45}.checklist{list-style:none}.checklist-item{display:flex;align-items:flex-start;gap:var(--sp-3);padding:var(--sp-3) 0;border-bottom:1px solid var(--border-subtle)}.checklist-item:last-child{border-bottom:none}.checklist-checkbox{width:20px;height:20px;border:2px solid var(--text-muted);border-radius:var(--radius-sm);flex-shrink:0;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast);margin-top:2px}.checklist-checkbox.checked{background:var(--emerald-500);border-color:var(--emerald-500)}.checklist-checkbox.checked:after{content:"✓";color:#fff;font-size:12px;font-weight:700}.checklist-text{font-size:var(--text-sm);color:var(--text-primary);line-height:1.5}.progress-bar{width:100%;height:6px;background:var(--border-subtle);border-radius:var(--radius-full);overflow:hidden}.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--amber-500),var(--emerald-400));border-radius:var(--radius-full);transition:width .6s ease}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:200;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:all var(--transition-base)}.modal-overlay.active{opacity:1;visibility:visible}.modal{background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-xl);width:90%;max-width:560px;max-height:85vh;overflow-y:auto;animation:scaleIn .3s ease}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--sp-5) var(--sp-6);border-bottom:1px solid var(--border-subtle)}.modal-title{font-size:var(--text-lg);font-weight:700}.modal-body{padding:var(--sp-6)}.modal-footer{display:flex;justify-content:flex-end;gap:var(--sp-3);padding:var(--sp-4) var(--sp-6);border-top:1px solid var(--border-subtle)}.toast-container{position:fixed;top:var(--sp-4);right:var(--sp-4);z-index:300;display:flex;flex-direction:column;gap:var(--sp-3)}.toast{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-3) var(--sp-5);background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);animation:slideInLeft .3s ease;min-width:280px}.toast-success{border-left:3px solid var(--emerald-500)}.toast-error{border-left:3px solid var(--rose-500)}.toast-info{border-left:3px solid var(--amber-500)}.toast-message{font-size:var(--text-sm);color:var(--text-primary);flex:1}.help-role-jumplinks{display:flex;gap:.5rem;flex-wrap:wrap;margin:1rem 0 1.5rem}.help-role-section{border:1px solid var(--border-default, rgba(255,255,255,.08));border-radius:8px;margin:1rem 0;overflow:hidden;background:var(--bg-surface, rgba(255,255,255,.02))}.help-role-section>summary{list-style:none;cursor:pointer;padding:1rem 1.25rem;display:flex;align-items:center;gap:.75rem;background:#ffffff08;font-weight:600}.help-role-section>summary::-webkit-details-marker{display:none}.help-role-section>summary:after{content:"▾";margin-left:auto;opacity:.6;transition:transform .15s ease}.help-role-section[open]>summary:after{transform:rotate(180deg)}.help-role-section .help-role-sub-body{padding:1rem 1.25rem;border-top:1px solid var(--border-default, rgba(255,255,255,.06))}.help-role-section .help-role-sub-body h4{margin:1rem 0 .4rem;font-size:1rem;color:var(--amber-300, #fcd34d)}.help-role-section .help-role-sub-body h4:first-child{margin-top:0}.help-role-section .help-role-sub-body ul,.help-role-section .help-role-sub-body ol{padding-left:1.25rem;margin:.25rem 0 .75rem}.help-role-section .help-role-sub-body li{margin:.35rem 0;line-height:1.5}.help-role-section .help-role-sub-body code{background:#ffffff0f;padding:.05rem .35rem;border-radius:3px;font-size:.9em}.help-role-section .help-role-sub-body em{color:var(--amber-200, #fde68a);font-style:normal}.help-role-section .help-role-sub-body p{margin:.35rem 0 .75rem;line-height:1.55}.help-preset-table{width:100%;border-collapse:collapse;font-size:.88rem;margin:.25rem 0}.help-preset-table th,.help-preset-table td{text-align:left;padding:.45rem .6rem;border-bottom:1px solid var(--border-subtle, rgba(255,255,255,.06));vertical-align:top}.help-preset-table thead th{color:var(--text-secondary);font-weight:600;border-bottom:1px solid var(--border-default)}.help-preset-table tbody tr:last-child td{border-bottom:none}.help-preset-table td:first-child{color:var(--text-accent);font-weight:600;white-space:nowrap}.ou-validto{background:none;border:none;padding:0;font:inherit;color:inherit;cursor:pointer;line-height:1.3;border-bottom:1px dashed var(--border-strong)}.ou-validto:hover{color:var(--text-primary);border-bottom-color:var(--amber-500)}.ou-validto-pen{opacity:.4;font-size:.82em;margin-left:.18rem}.ou-validto:hover .ou-validto-pen{opacity:.85}.ou-vt-editor{position:absolute;top:50%;right:.3rem;left:auto;transform:translateY(-50%);z-index:20;display:flex;align-items:center;gap:.25rem;max-width:240px;background:var(--bg-elevated);border:1px solid var(--border-default);border-radius:6px;padding:.2rem .3rem;box-shadow:var(--shadow-md)}.ou-vt-editor .ou-vt-input{width:130px;flex:none;padding:.12rem .25rem;font-size:.74rem;color:var(--text-primary);background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:4px;color-scheme:light dark}.downloads-block{margin:1.25rem 0;padding:1rem 1.1rem;background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:12px}.downloads-title{font-weight:600;font-size:.95rem;color:var(--text-heading);margin-bottom:.6rem}.downloads-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.45rem}.dl-item{margin:0}.dl-link,.dl-item-nolink{display:flex;align-items:center;gap:.7rem;padding:.6rem .75rem;border:1px solid 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#fbbf24)!important;font-weight:700!important;font-size:.8125rem!important;border-bottom:1px solid rgba(251,191,36,.2);background:#fbbf240a}body.r-presenter-open{overflow:hidden}.r-pres-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:var(--bg-base, #0f0f23);z-index:10000;display:flex;flex-direction:column;animation:r-pres-fade .2s ease}@keyframes r-pres-fade{0%{opacity:0}to{opacity:1}}.r-pres-topbar{display:flex;align-items:center;gap:1.5rem;padding:1rem 2rem;border-bottom:1px solid var(--border-color, rgba(255,255,255,.08));font-size:.875rem;color:var(--text-muted, #94a3b8)}.r-pres-id{font-family:ui-monospace,monospace;color:var(--amber-400, #fbbf24)}.r-pres-progress{font-weight:700;font-size:1rem;color:var(--text-primary)}.r-pres-count{margin-left:auto}.r-pres-close{background:transparent;border:1px solid var(--border-color, 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rgba(255,255,255,.06));position:relative;overflow:hidden;font-size:1.125rem}.r-pres-bar-correct{border-color:#10b98166;background:#10b9810f}.r-pres-fill{position:absolute;top:0;right:0;bottom:0;left:0;background:#fbbf242e;z-index:0;transition:width .5s cubic-bezier(.22,1,.36,1);border-radius:10px}.r-pres-bar-correct .r-pres-fill{background:#10b9812e}.r-pres-label{position:relative;z-index:1;font-weight:500;line-height:1.4}.r-pres-num{position:relative;z-index:1;font-size:1.75rem;font-weight:700;font-variant-numeric:tabular-nums;color:var(--amber-400, #fbbf24)}.r-pres-bar-correct .r-pres-num{color:#10b981}.r-pres-pie-wrap{display:flex;align-items:center;gap:2.5rem;margin-top:1.5rem;width:100%;max-width:720px;flex-wrap:wrap;justify-content:center}.r-pres-pie{width:clamp(220px,32vw,360px);height:auto;flex-shrink:0;filter:drop-shadow(0 4px 12px rgba(0,0,0,.15))}.r-pres-legend{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.6rem;min-width:200px}.r-pres-legend li{display:grid;grid-template-columns:18px auto auto 1fr;align-items:center;gap:.5rem .75rem;font-size:1.1rem;color:#1e293b}.r-pres-legend-correct{font-weight:600}.r-pres-legend-correct .r-pres-num{color:#10b981}.r-pres-legend .r-pres-num{font-size:1.2rem;font-weight:700;font-variant-numeric:tabular-nums;color:#0f172a}.r-pres-swatch{width:14px;height:14px;border-radius:3px;display:inline-block}.r-pres-legend-label{color:#475569}.r-pres-dots{display:flex;gap:1.5rem;margin-top:1.5rem;align-items:flex-end;justify-content:center;flex-wrap:wrap;width:100%;max-width:900px}.r-pres-dots-col{display:flex;flex-direction:column;align-items:center;min-width:120px;flex:1 1 0;max-width:200px}.r-pres-dots-cluster{display:flex;flex-wrap:wrap;gap:4px;justify-content:center;align-items:center;margin-bottom:.8rem;min-height:60px;position:relative}.r-pres-dot{width:14px;height:14px;border-radius:50%;display:inline-block}.r-pres-dots-overflow{margin-left:4px;font-size:.85rem;color:#64748b;font-weight:600}.r-pres-dots-meta{text-align:center;line-height:1.3}.r-pres-dots-meta .r-pres-num{font-size:1.4rem;font-weight:700;color:#0f172a;font-variant-numeric:tabular-nums}.r-pres-dots-col-correct .r-pres-dots-meta .r-pres-num{color:#10b981}.r-pres-dots-label{display:block;font-size:.95rem;color:#475569;margin-top:4px}body:not(.r-mode-hidden) .r-pres-pie-wrap .r-count-pct,body:not(.r-mode-hidden) .r-pres-dots .r-count-pct{display:none}.r-pres-stage.r-show-pct .r-count-num{display:none}.r-pres-stage.r-show-pct .r-count-pct{display:inline}.r-pres-answer-list{list-style:none;padding:0;margin:0;width:100%;max-width:900px;max-height:60vh;overflow-y:auto;display:flex;flex-direction:column;gap:.75rem}.r-pres-answer-list li{background:#ffffff0a;padding:1rem 1.25rem;border-radius:10px;border-left:3px solid var(--amber-400, #fbbf24);font-size:1.0625rem;line-height:1.5}.r-pres-answer-list strong{color:var(--amber-400, #fbbf24);margin-right:.5rem}.r-pres-nav{display:flex;justify-content:center;gap:1rem;padding:1rem 2rem 2rem}.r-fillin-student{padding:.25rem 0 .5rem}.r-fillin-list{list-style:none;padding:0 0 0 .5rem;margin:.25rem 0 0;display:flex;flex-direction:column;gap:.35rem}.r-fillin-list li{font-size:1rem;line-height:1.45;padding:.45rem .7rem;background:#ffffff06;border-left:3px solid var(--amber-400, #fbbf24);border-radius:4px}.r-fillin-list li.lang-vn{border-left-color:var(--navy-500, #5c7cfa)}@media(max-width:720px){.r-header{flex-direction:column;align-items:stretch}.r-ex-header{flex-direction:column;align-items:flex-start}.r-pres-bar{font-size:1rem}.r-pres-num{font-size:1.25rem}}body.r-mode-numbers .r-opt-bar,body.r-mode-numbers .r-opt-fill,body.r-mode-numbers .r-pres-fill{background:transparent!important}body.r-mode-numbers .r-opt-bar{background:#ffffff0a!important}body.r-mode-hidden .r-opt-bar,body.r-mode-hidden .r-opt-fill,body.r-mode-hidden .r-pres-fill{background:transparent!important}body.r-mode-hidden .r-opt-bar{background:#ffffff0a!important}body.r-mode-hidden .r-opt-count,body.r-mode-hidden .r-pres-num,body.r-mode-hidden .r-q-acc,body.r-mode-hidden .r-pres-acc,body.r-mode-hidden .r-ex-count,body.r-mode-hidden .r-pres-count,body.r-mode-hidden .quiz-podium-score,body.r-mode-hidden .guessnum-pres-stats,body.r-mode-hidden .guessnum-summary-line,body.r-mode-hidden .guessnum-value,body.r-mode-hidden 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tr:hover{background:#ffffff08}.qa-table .qa-num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}.qa-rank{color:var(--text-muted);font-weight:700}.qa-module{color:var(--text-secondary);white-space:nowrap}.qa-text-vn{font-size:.78rem;margin-top:2px}.qa-acc-cell{min-width:160px}.qa-acc-bar{display:inline-block;vertical-align:middle;width:100px;height:6px;background:#ffffff14;border-radius:3px;overflow:hidden;margin-right:8px}.qa-acc-fill{display:block;height:100%;background:var(--amber-400);transition:width .3s}.qa-acc-pct{font-weight:700}.r-acc-band-hard .qa-acc-fill{background:var(--rose-500, #f43f5e)}.r-acc-band-hard .qa-acc-pct{color:var(--rose-300, #fda4af)}.r-acc-band-mid .qa-acc-fill{background:var(--amber-400, #fbbf24)}.r-acc-band-mid .qa-acc-pct{color:var(--amber-300, #fcd34d)}.r-acc-band-easy .qa-acc-fill{background:var(--emerald-400, #34d399)}.r-acc-band-easy .qa-acc-pct{color:var(--emerald-300, #6ee7b7)}.r-acc-band-none .qa-acc-pct{color:var(--text-muted)}.hist-summary{display:flex;gap:var(--sp-3);flex-wrap:wrap;margin-top:var(--sp-2)}.hist-summary>.qa-summary-stat{min-width:120px}.hist-timeline{list-style:none;padding:0;display:grid;gap:var(--sp-2)}.hist-row{display:grid;grid-template-columns:160px 28px 1fr auto auto;align-items:center;gap:var(--sp-3);padding:8px 12px;background:#ffffff08;border-left:3px solid var(--border-subtle);border-radius:var(--radius-sm);font-size:var(--text-sm)}.hist-row.r-acc-band-hard{border-left-color:var(--rose-500)}.hist-row.r-acc-band-mid{border-left-color:var(--amber-400)}.hist-row.r-acc-band-easy{border-left-color:var(--emerald-500)}.hist-when{color:var(--text-muted);font-size:.78rem;white-space:nowrap}.hist-kind{text-align:center}.hist-title{font-weight:600}.hist-detail{color:var(--text-secondary);font-size:.85rem}.hist-dur{color:var(--text-muted);font-size:.78rem;font-variant-numeric:tabular-nums}@media(max-width:720px){.hist-row{grid-template-columns:1fr auto}.hist-row>.hist-when{grid-column:1 / -1;order:1}.hist-row>.hist-kind{order:2}.hist-row>.hist-title{order:3}.hist-row>.hist-detail{grid-column:1 / -1;order:4}.hist-row>.hist-dur{grid-column:1 / -1;order:5;text-align:right}}:root[data-theme=light] .r-cell-miss{color:#0f172a38}:root[data-theme=light] .r-pres-leaderboard,:root[data-theme=light] .r-pres-leaderboard .lb-header,:root[data-theme=light] .r-pres-leaderboard .lb-name,:root[data-theme=light] .r-pres-leaderboard .lb-acc{color:#f1f5f9}:root[data-theme=light] .r-pres-leaderboard .lb-rank-num{color:#cbd5e1}:root[data-theme=light] .r-pres-leaderboard .lb-score{color:#fcd34d}:root[data-theme=light] .r-pres-teams,:root[data-theme=light] .r-pres-teams .team-panel-title,:root[data-theme=light] .r-pres-teams .team-name,:root[data-theme=light] .r-pres-teams .team-rank{color:#f1f5f9}:root[data-theme=light] .r-pres-teams .team-rank-num{color:#cbd5e1}:root[data-theme=light] .r-pres-teams 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