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h2{font-size:1.5rem;font-weight:700;margin-bottom:24px}.score-circle{width:140px;height:140px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-light));display:flex;align-items:center;justify-content:center;margin:0 auto 24px}.score-value{font-size:2rem;font-weight:700;color:#fff}.results-stats{display:flex;justify-content:center;gap:40px;margin-bottom:32px}.result-stat{display:flex;flex-direction:column;align-items:center}.result-value{font-size:2rem;font-weight:700}.result-stat.correct .result-value{color:var(--success)}.result-stat.incorrect .result-value{color:var(--error)}.result-label{font-size:.875rem;color:var(--text-muted);margin-top:4px}.install-prompt{position:fixed;bottom:0;left:0;right:0;background:var(--bg-card);padding:16px 20px;display:flex;align-items:center;gap:12px;box-shadow:0 -4px 12px #0000001a;z-index:1000}.install-prompt.hidden{display:none}.install-prompt p{flex:1;font-size:.9375rem;color:var(--text-primary)}.install-btn{padding:10px 20px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);font-weight:500;cursor:pointer}.dismiss-btn{padding:10px 16px;background:transparent;color:var(--text-muted);border:none;cursor:pointer}@media (max-width: 380px){.header h1,.question-text{font-size:1rem}.option-text{font-size:.875rem}.stats-grid{gap:8px}.stat-value{font-size:1.25rem}}@supports (padding: max(0px)){.header{padding-top:max(16px,env(safe-area-inset-top))}.install-prompt{padding-bottom:max(16px,env(safe-area-inset-bottom))}}@media (hover: none){.option-btn:active:not(:disabled){transform:scale(.98);background:var(--bg-secondary)}.nav-btn:active:not(:disabled){transform:scale(.98)}.mark-btn:active{transform:scale(.95)}}html{scroll-behavior:smooth}.main-content{scrollbar-width:none;-ms-overflow-style:none}.main-content::-webkit-scrollbar{display:none}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}.flashcard-inner{transition:none!important}.progress-bar:after{transition:none!important}}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}button:focus-visible,select:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.skip-link{position:absolute;top:-40px;left:0;background:var(--accent);color:#fff;padding:8px 16px;z-index:1000;transition:top .2s}.skip-link:focus{top:0}.concepts-header{text-align:center;margin-bottom:24px}.concepts-header h2{font-size:1.5rem;font-weight:700;color:var(--text-primary);margin-bottom:8px}.concepts-subtitle{color:var(--text-muted);font-size:.9375rem}.concepts-container{max-height:calc(100vh - 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