:root{--qcm-bg:var(--cq-bg-alt, #f8fafc);--qcm-card-bg:var(--cq-card-bg, #ffffff);--qcm-text:var(--cq-text, #1e293b);--qcm-text-muted:var(--cq-text-muted, #64748b);--qcm-border:var(--cq-border, #e2e8f0);--qcm-accent:var(--cq-accent, #6366f1);--qcm-accent-light:rgba(99, 102, 241, 0.1);--qcm-success:var(--cq-success, #10b981);--qcm-success-light:rgba(16, 185, 129, 0.1);--qcm-danger:var(--cq-danger, #ef4444);--qcm-danger-light:rgba(239, 68, 68, 0.1);--qcm-warning:var(--cq-warning, #f59e0b);--qcm-warning-light:rgba(245, 158, 11, 0.1);--qcm-gradient:var(--cq-hero-gradient, linear-gradient(135deg, var(--cq-accent, #6366f1) 0%, var(--cq-accent-alt, #8b5cf6) 100%));--qcm-shadow:0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);--qcm-shadow-lg:0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);--qcm-radius:12px;--qcm-radius-sm:8px;--premium-accent:var(--cq-accent, #6366f1);--premium-accent-hover:var(--cq-accent-hover, #4f46e5);--premium-accent-bg:var(--qcm-accent-light, rgba(99, 102, 241, 0.1))}body.qcm-dark,[data-theme="dark"]{--premium-accent-bg:rgba(99, 102, 241, 0.2)}body.qcm-dark,[data-theme="dark"]{--qcm-bg:var(--cq-bg-alt, #1e293b);--qcm-card-bg:var(--cq-card-bg, #1f2937);--qcm-text:var(--cq-text, #f1f5f9);--qcm-text-muted:var(--cq-text-muted, #94a3b8);--qcm-border:var(--cq-border, #374151);--qcm-accent-light:rgba(99, 102, 241, 0.2);--qcm-success-light:rgba(16, 185, 129, 0.2);--qcm-danger-light:rgba(239, 68, 68, 0.2);--qcm-shadow:0 4px 6px -1px rgba(0, 0, 0, 0.3);--qcm-shadow-lg:0 10px 15px -3px rgba(0, 0, 0, 0.4)}#qcm-app{font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;color:var(--qcm-text);line-height:1.5}#qcm-app *{box-sizing:border-box}.qcm-hidden{display:none!important}.qcm-error{text-align:center;padding:2rem 1.5rem;background:var(--qcm-card-bg);border-radius:var(--qcm-radius);border:1px solid var(--qcm-border)}.qcm-error-icon{font-size:3rem;margin-bottom:1rem}.qcm-prep-state{text-align:center;padding:2rem 1.25rem;background:var(--qcm-card-bg,#fff);border:1px solid var(--qcm-border,#e5e7eb);border-radius:var(--qcm-radius,16px)}.qcm-prep-state__title,.qcm-prep-state h2{margin:0 0 .5rem;font-size:1.25rem}.qcm-prep-state p{margin:0 auto;max-width:36rem;color:var(--qcm-text-muted,#64748b)}.qcm-keys-hint{margin:.75rem 0 0;font-size:.8125rem;line-height:1.4;text-align:center;color:var(--qcm-text-muted,#6b7280)}@media (max-width:640px){.qcm-keys-hint{display:none}}@media (prefers-reduced-motion:reduce){.qcm-prep-state,.qcm-keys-hint{animation:none}}.qcm-start-screen{animation:qcm-fade-in 0.4s ease-out}.qcm-start-card{background:var(--qcm-card-bg);border-radius:var(--qcm-radius);padding:1.5rem 2rem;box-shadow:var(--qcm-shadow-lg);border:1px solid var(--qcm-border);max-width:1100px;margin:0 auto}.qcm-start-header{text-align:center;margin-bottom:1.5rem;padding-bottom:1.25rem;border-bottom:1px solid var(--qcm-border)}.qcm-start-title{font-size:2rem;font-weight:700;margin:0 0 1rem 0;color:var(--qcm-text)}.qcm-start-meta{display:flex;justify-content:center;gap:2rem;flex-wrap:wrap}.qcm-meta-item{font-size:1.0625rem;color:var(--qcm-text-muted);font-weight:500}.qcm-mode-title{font-size:1.25rem;font-weight:700;color:var(--qcm-text);margin:0 0 .75rem 0;text-align:center}.qcm-mode-subtitle{font-size:.9375rem;color:var(--qcm-text-muted);margin:0 0 1.25rem 0;text-align:center;font-weight:400;line-height:1.5;max-width:600px;margin-left:auto;margin-right:auto}.qcm-mode-selection{text-align:center;container-type:inline-size}.qcm-mode-selection .qcm-modes-grid{display:grid!important;grid-template-columns:repeat(2,minmax(0,1fr))!important;gap:0.75rem!important;padding:0!important;margin-top:1rem;max-width:100%}.qcm-mode-selection 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0.25s ease;text-align:left!important;width:100%;height:auto!important;min-height:0;position:relative}.qcm-mode-selection .qcm-mode-card:hover{border-color:var(--qcm-accent,#6366f1)!important;box-shadow:0 8px 24px rgb(99 102 241 / .18);transform:translateY(-3px)}.qcm-mode-selection .qcm-mode-card:active{transform:translateY(-1px)}.qcm-mode-selection .qcm-mode-card:focus-visible{outline:2px solid #4f46e5;outline-offset:3px}.qcm-mode-card--locked{cursor:pointer}.qcm-mode-lock{display:inline-flex;margin-left:.35rem;color:#4f46e5;vertical-align:-2px}.qcm-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.qcm-end-note{margin:0 0 1rem;font-size:.95rem;line-height:1.5;color:var(--qcm-text-muted,#475569)}.qcm-end-remaining{margin:0 0 1rem;padding:.85rem 1rem;border-radius:12px;text-align:left;background:color-mix(in srgb,#6366f1 8%,#fff);border:1px solid color-mix(in srgb,#6366f1 22%,#e5e7eb)}.qcm-end-remaining p{margin:0 0 .4rem;font-weight:700}.qcm-end-remaining ul{margin:0;padding-left:1.1rem}.qcm-end-remaining li{margin:.3rem 0}.qcm-mode-selection .qcm-mode-icon{font-size:1.25rem;line-height:1;width:1.25rem;height:1.25rem;color:var(--mode-accent,var(--qcm-accent))}.qcm-mode-selection .qcm-mode-info{display:contents}.qcm-mode-selection .qcm-mode-info h4{grid-column:2;font-size:1rem;font-weight:700;line-height:1.25;margin:0;color:var(--qcm-text);display:flex;align-items:center;flex-wrap:wrap;gap:.25rem;overflow-wrap:anywhere}.qcm-mode-selection .qcm-mode-info p{grid-column:1 / -1;font-size:.8125rem;color:var(--qcm-text-muted);margin:0;line-height:1.4;overflow-wrap:break-word;word-break:break-word}.qcm-mode-selection .qcm-mode-badges{grid-column:1 / -1;display:flex;justify-content:flex-start;gap:.25rem;flex-wrap:wrap}.qcm-mode-selection .qcm-badge{font-size:.6875rem;padding:.2rem .4rem}.qcm-badge{font-size:.75rem;font-weight:600;padding:.375rem .625rem;border-radius:100px;background:var(--qcm-accent-light);color:var(--qcm-accent)}.qcm-badge-muted{background:var(--qcm-border);color:var(--qcm-text-muted)}.qcm-badge-xp{background:var(--qcm-warning-light);color:var(--qcm-warning)}.qcm-mode-card--premium{position:relative;overflow:hidden;opacity:.85;cursor:default!important}.qcm-mode-card--premium::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(135deg,rgb(99 102 241 / .03) 0%,rgb(139 92 246 / .06) 100%);pointer-events:none}.qcm-mode-card--premium:hover{transform:none!important;box-shadow:var(--qcm-shadow)!important;border-color:var(--qcm-border)!important;cursor:default!important}.qcm-badge-premium{background:linear-gradient(135deg,#6366f1 0%,#8b5cf6 100%);color:#fff;font-size:.6875rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px;padding:.25rem .5rem;border-radius:4px;display:inline-flex;align-items:center;gap:.25rem}.qcm-badge-premium::before{content:'✨';font-size:.625rem}.qcm-mode-coming-soon{position:absolute;bottom:.75rem;right:.75rem;font-size:.6875rem;color:var(--qcm-text-muted);font-style:italic}.qcm-runner{animation:qcm-fade-in 0.4s ease-out;max-width:1000px;margin:0 auto;padding:0 1.5rem;min-width:0;overflow-x:clip}.qcm-topbar{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;padding:1.25rem 1.5rem;background:var(--qcm-card-bg);border-radius:var(--qcm-radius);margin-bottom:2rem;box-shadow:var(--qcm-shadow-lg);border:1px solid var(--qcm-border)}.qcm-topbar-left{display:flex;align-items:center;gap:.625rem;flex-wrap:wrap;flex-shrink:0}.qcm-streak-indicator{display:inline-flex;align-items:center;gap:.35rem;padding:.35rem .7rem;border-radius:999px;border:1px solid rgb(251 113 133 / .35);background:rgb(251 113 133 / .12);color:#f43f5e;font-size:.8125rem;font-weight:700;letter-spacing:.02em}.qcm-streak-indicator.streak-hot{border-color:rgb(245 158 11 / .4);background:rgb(245 158 11 / .15);color:#d97706}.qcm-streak-indicator.streak-legendary{border-color:rgb(168 85 247 / .45);background:rgb(168 85 247 / .17);color:#7c3aed}.qcm-streak-indicator.streak-pulse{animation:qcm-streak-pop 0.26s ease-out}.qcm-combo-indicator{display:inline-flex;align-items:center;gap:.35rem;padding:.35rem .7rem;border-radius:999px;border:1px solid rgb(59 130 246 / .35);background:rgb(59 130 246 / .12);color:#2563eb;font-size:.8125rem;font-weight:700}.qcm-combo-indicator.combo-hot{border-color:rgb(249 115 22 / .45);background:rgb(249 115 22 / .15);color:#ea580c}.qcm-mode-indicator{font-size:.9375rem;font-weight:700;color:var(--qcm-accent);background:var(--qcm-accent-light);padding:.5rem 1rem;border-radius:100px;letter-spacing:.3px}.qcm-topbar-center{flex:1;max-width:450px}.qcm-progress-wrapper{display:flex;align-items:center;gap:1rem}.qcm-progress-bar{flex:1;height:10px;background:var(--qcm-border);border-radius:100px;overflow:hidden;box-shadow:inset 0 1px 2px rgb(0 0 0 / .05)}.qcm-progress-fill{height:100%;background:var(--qcm-gradient);border-radius:100px;transition:width 0.4s cubic-bezier(.4,0,.2,1)}.qcm-progress-text{font-size:.875rem;font-weight:700;color:var(--qcm-text);white-space:nowrap;min-width:50px;text-align:right}.qcm-topbar-right{display:flex;align-items:center;gap:1.25rem;flex-shrink:0;position:relative}.qcm-topbar-right .qcm-premium-display{order:-1;margin-left:auto;min-width:fit-content}.qcm-timer{display:flex;align-items:center;gap:.375rem;padding:.375rem .75rem;background:var(--qcm-accent-light);border-radius:100px;transition:all 0.15s}.qcm-timer-icon{font-size:.875rem}.qcm-timer-value{font-size:.875rem;font-weight:700;font-variant-numeric:tabular-nums;color:var(--qcm-accent)}.qcm-timer.qcm-timer-warning{background:var(--qcm-warning-light)}.qcm-timer.qcm-timer-warning .qcm-timer-value{color:var(--qcm-warning)}.qcm-timer.qcm-timer-danger{background:var(--qcm-danger-light);animation:qcm-pulse 1s infinite}.qcm-timer.qcm-timer-danger .qcm-timer-value{color:var(--qcm-danger)}.qcm-premium-display{display:flex!important;align-items:center;gap:.625rem;padding:.625rem 1.25rem;background:var(--premium-accent-bg,var(--qcm-accent-light,rgb(99 102 241 / .1)));border:1.5px solid var(--premium-accent,var(--qcm-accent,#6366f1));border-radius:10px;font-weight:600;transition:all 0.15s cubic-bezier(.4,0,.2,1);box-shadow:0 2px 8px rgb(99 102 241 / .15),0 0 0 1px rgb(255 255 255 / .5) inset;position:relative;overflow:hidden;z-index:10}.qcm-premium-display::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgb(255 255 255 / .2),transparent);transition:left 0.35s ease}.qcm-premium-display:hover{background:var(--premium-accent-bg,var(--qcm-accent-light,rgb(99 102 241 / .15)));border-color:var(--premium-accent-hover,var(--cq-accent-hover,#4f46e5));transform:translateY(-1px);box-shadow:0 4px 12px rgb(99 102 241 / .2),0 0 0 1px rgb(255 255 255 / .6) inset}.qcm-premium-display:hover::before{left:100%}.qcm-premium-icon{font-size:1.25rem;line-height:1;filter:drop-shadow(0 1px 2px rgb(0 0 0 / .1));animation:qcm-premium-pulse 3s ease-in-out infinite}@keyframes qcm-premium-pulse{0%,100%{transform:scale(1);opacity:1}50%{transform:scale(1.02);opacity:.9}}.qcm-premium-label{font-size:.6875rem;color:var(--premium-accent,var(--qcm-accent,#6366f1));text-transform:uppercase;letter-spacing:.04em;font-weight:700;white-space:nowrap}.qcm-premium-value{font-size:1rem;color:var(--premium-accent-hover,var(--cq-accent-hover,#4f46e5));font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:-.3px}body.qcm-dark .qcm-premium-display,[data-theme="dark"] .qcm-premium-display{background:var(--premium-accent-bg,rgb(99 102 241 / .2));border-color:var(--premium-accent,var(--qcm-accent,#6366f1));box-shadow:0 2px 8px rgb(99 102 241 / .2),0 0 0 1px rgb(255 255 255 / .1) inset}body.qcm-dark .qcm-premium-display:hover,[data-theme="dark"] .qcm-premium-display:hover{background:var(--premium-accent-bg,rgb(99 102 241 / .25));border-color:var(--premium-accent-hover,var(--cq-accent-hover,#4f46e5));box-shadow:0 4px 12px rgb(99 102 241 / .25),0 0 0 1px rgb(255 255 255 / .15) inset}body.qcm-dark .qcm-premium-label,[data-theme="dark"] .qcm-premium-label{color:var(--premium-accent,var(--qcm-accent,#818cf8))}body.qcm-dark .qcm-premium-value,[data-theme="dark"] .qcm-premium-value{color:var(--premium-accent,var(--qcm-accent,#818cf8))}body.qcm-dark .qcm-premium-icon,[data-theme="dark"] .qcm-premium-icon{filter:drop-shadow(0 1px 3px rgb(99 102 241 / .4))}.qcm-premium-display.qcm-premium-hidden{display:none!important;visibility:hidden!important;opacity:0!important}#qcm-premium-display,#qcm-premium-display-start,.qcm-premium-display{display:flex!important;visibility:visible!important;opacity:1!important}.qcm-start-screen{position:relative}.qcm-premium-display--start{position:absolute;top:0;right:0;z-index:100;margin:1rem}}*/ .qcm-question-card{background:var(--qcm-card-bg);border-radius:var(--qcm-radius);padding:1.75rem 2.5rem;box-shadow:var(--qcm-shadow-lg);border:1px solid var(--qcm-border);margin-bottom:1.5rem;max-width:900px;margin-left:auto;margin-right:auto}.qcm-question-text{font-size:1.5rem;font-weight:700;margin:0 0 1rem 0;color:var(--qcm-text);line-height:1.5;flex:1}.qcm-question-head{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem}.qcm-diff-badge{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;font-size:.75rem;font-weight:700;letter-spacing:.02em;padding:.35rem .75rem;white-space:nowrap;border:1px solid #fff0}.qcm-diff-easy{color:#047857;background:rgb(16 185 129 / .15);border-color:rgb(16 185 129 / .35)}.qcm-diff-medium{color:#b45309;background:rgb(245 158 11 / .18);border-color:rgb(245 158 11 / .35)}.qcm-diff-hard{color:#be123c;background:rgb(244 63 94 / .16);border-color:rgb(244 63 94 / .35)}.qcm-milestone-progress{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.5rem;margin-bottom:1.1rem}.qcm-milestone-progress .milestone-step{text-align:center;font-size:.7rem;font-weight:700;color:var(--qcm-text-muted);border:1px solid var(--qcm-border);border-radius:999px;padding:.28rem .45rem;background:var(--qcm-bg);transition:all 0.2s ease}.qcm-milestone-progress .milestone-step.is-current{border-color:var(--qcm-accent);color:var(--qcm-accent);box-shadow:0 0 0 2px var(--qcm-accent-light) inset}.qcm-milestone-progress .milestone-step.is-completed{border-color:rgb(16 185 129 / .45);color:#047857;background:rgb(16 185 129 / .14)}.qcm-question-card{transition:border-color 0.22s ease,box-shadow 0.22s ease,transform 0.22s ease}.qcm-question-card.qcm-card-success{border-color:rgb(16 185 129 / .5);box-shadow:0 0 0 3px rgb(16 185 129 / .12),var(--qcm-shadow-lg);animation:qcm-card-flash-success 0.32s ease-out}.qcm-question-card.qcm-card-error{border-color:rgb(239 68 68 / .5);box-shadow:0 0 0 3px rgb(239 68 68 / .12),var(--qcm-shadow-lg);animation:qcm-card-flash-error 0.32s ease-out}body.qcm-dark .qcm-question-text,[data-theme="dark"] .qcm-question-text{color:#fff}.qcm-options-list{display:flex;flex-direction:column;gap:.75rem}.qcm-option{display:flex;align-items:flex-start;gap:1rem;padding:1.25rem 1.5rem;background:var(--qcm-bg);border:2px solid var(--qcm-border);border-radius:var(--qcm-radius-sm);cursor:pointer;transition:all 0.2s ease;position:relative}.qcm-option:hover{border-color:var(--qcm-accent);background:var(--qcm-accent-light)}.qcm-option input{position:absolute;opacity:0;width:0;height:0}.qcm-option-letter{flex-shrink:0;width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--qcm-accent-light);color:var(--qcm-accent);font-weight:700;font-size:1rem;border-radius:10px;transition:all 0.2s}.qcm-option-text{flex:1;font-size:1.0625rem;color:var(--qcm-text);line-height:1.6}.qcm-option-indicator{flex-shrink:0;width:24px;height:24px;border:2px solid var(--qcm-border);border-radius:50%;transition:all 0.2s}.qcm-option.qcm-option-selected{border-color:var(--qcm-accent);background:var(--qcm-accent-light)}.qcm-option.qcm-option-selected .qcm-option-letter{background:var(--qcm-accent);color:#fff}.qcm-option.qcm-option-selected .qcm-option-indicator{border-color:var(--qcm-accent);background:var(--qcm-accent);box-shadow:inset 0 0 0 3px #fff}.qcm-option.qcm-option-correct{border-color:var(--qcm-success);background:var(--qcm-success-light)}.qcm-option.qcm-option-correct .qcm-option-letter{background:var(--qcm-success);color:#fff}.qcm-option.qcm-option-correct .qcm-option-indicator{border-color:var(--qcm-success);background:var(--qcm-success)}.qcm-option.qcm-option-wrong{border-color:var(--qcm-danger);background:var(--qcm-danger-light)}.qcm-option.qcm-option-wrong .qcm-option-letter{background:var(--qcm-danger);color:#fff}.qcm-option.qcm-option-wrong .qcm-option-indicator{border-color:var(--qcm-danger);background:var(--qcm-danger)}.qcm-feedback{margin-top:1.5rem;padding:1.25rem;border-radius:var(--qcm-radius-sm);animation:qcm-slide-down 0.3s ease-out}.qcm-feedback-status{display:flex;align-items:center;gap:.5rem;font-weight:600;font-size:1.125rem;margin-bottom:.5rem}.qcm-feedback-status.correct{color:var(--qcm-success)}.qcm-feedback-status.wrong{color:var(--qcm-danger)}.qcm-feedback-status .status-icon{font-size:1.25rem}.qcm-feedback-explanation{font-size:.9375rem;color:var(--qcm-text);line-height:1.6;padding-left:1.75rem}.qcm-actions{display:flex;justify-content:space-between;gap:1.25rem;max-width:900px;margin:0 auto}.qcm-btn{display:inline-flex;align-items:center;justify-content:center;gap:.625rem;padding:1rem 2rem;font-size:1.0625rem;font-weight:600;border-radius:100px;cursor:pointer;transition:all 0.25s ease;border:none;text-decoration:none}.qcm-btn-primary{background:var(--qcm-gradient);color:#fff;box-shadow:0 4px 12px rgb(99 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