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modalFadeIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.hide{display:none!important}.invisible{visibility:hidden!important}::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:#a855f70a;border-radius:4px}::-webkit-scrollbar-thumb{background:#a855f733;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#a855f759}.problem-set-panels{display:flex;gap:16px;align-items:stretch}@media(max-width:600px){.problem-set-panels{flex-direction:column}}.problem-set-panel{flex:1;display:flex;flex-direction:column;padding:20px}.panel-title{margin-top:0;margin-bottom:14px;font-size:1.05rem;color:var(--c-text);font-weight:500}.radio-list{display:flex;flex-direction:column;gap:12px;flex:1}.radio-item{display:flex;align-items:center;gap:8px;font-size:.95rem;color:var(--c-text);cursor:pointer}.btn-delete-loaded{background:none;border:1px solid var(--c-text-muted);border-radius:50%;color:var(--c-text-muted);width:24px;height:24px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:14px;transition:all .2s;flex-shrink:0;padding:0;margin-left:8px}.btn-delete-loaded:hover{border-color:#ef4444;color:#ef4444;background-color:#fef2f2}.radio-item input[type=radio]{appearance:none;-webkit-appearance:none;width:18px;height:18px;flex-shrink:0;border:2px solid var(--c-primary-from);border-radius:50%;margin:0;position:relative;cursor:pointer;background:#fff;transition:outline .2s}.radio-item input[type=radio]:focus-visible{outline:3px solid rgba(168,85,247,.4);outline-offset:2px}.radio-item input[type=radio]:checked:after{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:10px;height:10px;background:var(--c-primary-from);border-radius:50%}@media(max-height:850px){.app-container{padding:16px}.app-header{margin-bottom:16px}.logo{font-size:2.2rem;margin-bottom:0}.card-glass{padding:20px}.quiz-progress-bar{margin-bottom:12px}.card-3d-wrapper{margin:12px 0}.card-3d{min-height:140px}.card-3d-side{padding:16px}.question-text{font-size:1.2rem}.typewriter-hint{margin-top:8px}.btn-reveal-small{font-size:.8rem;padding:6px 12px}.quiz-input-area{margin-top:12px}.quiz-answer-box{padding:10px 14px;font-size:1rem}.feedback-area{margin-top:12px;padding:12px;gap:8px}.feedback-badge{font-size:1.1rem;padding:4px 14px}.feedback-choice-row{margin-top:2px}}.btn-back-to-top{position:fixed;bottom:30px;right:30px;width:50px;height:50px;border-radius:50%;background:linear-gradient(135deg,var(--c-primary-from) 0%,var(--c-primary-to) 100%);color:#fff;border:1px solid rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(20px);transition:all .3s cubic-bezier(.34,1.56,.64,1);z-index:9999;box-shadow:0 8px 32px rgba(var(--c-primary-rgb),.3),inset 0 1px 1px #fff6;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}.btn-back-to-top.show{opacity:1;visibility:visible;transform:translateY(0)}.btn-back-to-top:hover{transform:translateY(-5px);box-shadow:0 12px 40px rgba(var(--c-primary-rgb),.4),inset 0 1px 1px #ffffff80;filter:brightness(1.05)}.btn-back-to-top:active{transform:translateY(0) scale(.95)}@media(max-width:600px){.btn-back-to-top{bottom:20px;right:20px;width:44px;height:44px}}.toast-notification{position:fixed;top:24px;left:50%;transform:translate(-50%) translateY(-20px);background:linear-gradient(135deg,var(--c-primary-from),var(--c-primary-to));color:#fff;padding:12px 24px;border-radius:8px;font-weight:700;box-shadow:0 4px 12px #a855f766;z-index:10000;opacity:0;transition:all .3s cubic-bezier(.16,1,.3,1);pointer-events:none}.toast-notification.show{opacity:1;transform:translate(-50%) translateY(0)}