.question-card{background-color:var(--card-background);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-lg);animation:.3s ease-in fadeIn}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.question-header{margin-bottom:var(--spacing-lg);padding-bottom:var(--spacing-md);border-bottom:2px solid var(--border-color);justify-content:space-between;align-items:center;display:flex}.question-number{color:var(--primary-color);font-size:1rem;font-weight:600}.category{color:var(--text-secondary);background-color:var(--background);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-sm);text-transform:capitalize;font-size:.875rem}.question-image{margin-bottom:var(--spacing-lg);text-align:center}.question-image img{border-radius:var(--radius-md);max-width:100%;height:auto;box-shadow:var(--shadow-md)}.image-caption{margin-top:var(--spacing-sm);color:var(--text-secondary);font-size:.875rem;font-style:italic}.question-text{margin-bottom:var(--spacing-lg);color:var(--text-primary);font-size:1.25rem;font-weight:600;line-height:1.6}.answers{gap:var(--spacing-md);flex-direction:column;display:flex}.answer-button{align-items:flex-start;gap:var(--spacing-md);width:100%;padding:var(--spacing-md);text-align:left;color:var(--text-primary);background-color:var(--card-background);border:2px solid var(--border-color);border-radius:var(--radius-md);cursor:pointer;min-height:44px;font-size:1rem;transition:all .2s;display:flex}.answer-button:hover:not(.disabled){border-color:var(--primary-color);background-color:var(--answer-hover-bg);transform:translate(4px)}.answer-button.selected{border-color:var(--primary-color);background-color:var(--answer-selected-bg)}.answer-button.correct{border-color:var(--success-color);background-color:var(--answer-correct-bg);cursor:default}.answer-button.incorrect{border-color:var(--error-color);background-color:var(--answer-incorrect-bg);cursor:default}.answer-button.disabled{opacity:.6;cursor:not-allowed}.answer-key{color:var(--primary-color);flex-shrink:0;font-weight:700}.answer-button.correct .answer-key{color:var(--success-color)}.answer-button.incorrect .answer-key{color:var(--error-color)}.answer-text{flex:1;line-height:1.5}.result-message{margin-top:var(--spacing-lg);padding:var(--spacing-md);border-radius:var(--radius-md);text-align:center;font-weight:600;animation:.3s ease-out slideIn}@keyframes slideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.result-message.correct{background-color:var(--result-correct-bg);color:var(--result-correct-text);border:2px solid var(--success-color)}.result-message.incorrect{background-color:var(--result-incorrect-bg);color:var(--result-incorrect-text);border:2px solid var(--error-color)}.result-message p{margin:0;font-size:1.125rem}@media (width<=640px){.question-card{padding:var(--spacing-md)}.question-text{font-size:1.125rem}.answer-button{padding:var(--spacing-sm) var(--spacing-md);font-size:.938rem}.answer-button:hover{transform:none}}.dark-mode-toggle{border-radius:var(--radius-md);color:#fff;cursor:pointer;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background-color:#ffffff1a;border:1px solid #fff3;justify-content:center;align-items:center;width:40px;height:40px;padding:0;transition:all .2s;display:flex}.dark-mode-toggle:hover{background-color:#fff3;transform:scale(1.05)}.dark-mode-toggle:active{transform:scale(.95)}.dark-mode-toggle svg{display:block}[data-theme=dark] .dark-mode-toggle{background-color:#ffffff0d;border-color:#ffffff1a}[data-theme=dark] .dark-mode-toggle:hover{background-color:#ffffff26}.app{flex-direction:column;min-height:100vh;display:flex}.app-header{background:linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);color:#fff;padding:var(--spacing-lg) var(--spacing-md);text-align:center;box-shadow:var(--shadow-md)}.header-content{justify-content:space-between;align-items:center;gap:var(--spacing-md);max-width:800px;margin:0 auto;display:flex}.header-text{text-align:left;flex:1}.app-header h1{margin-bottom:var(--spacing-xs);font-size:1.875rem;font-weight:700}.subtitle{opacity:.9;margin-bottom:var(--spacing-md);font-size:1rem}.stats{opacity:.85;text-align:center;margin-top:var(--spacing-md);font-size:.875rem}.app-main{width:100%;max-width:800px;padding:var(--spacing-lg) var(--spacing-md);flex:1;margin:0 auto}.loading{text-align:center;padding:var(--spacing-xl);color:var(--text-secondary);font-size:1.125rem}.next-button{width:100%;margin-top:var(--spacing-lg);padding:var(--spacing-md) var(--spacing-lg);color:#fff;background-color:var(--primary-color);border-radius:var(--radius-md);cursor:pointer;box-shadow:var(--shadow-sm);border:none;font-size:1.125rem;font-weight:600;transition:background-color .2s}.next-button:hover{background-color:var(--primary-hover)}.next-button:active{transform:translateY(1px)}.app-footer{text-align:center;padding:var(--spacing-lg) var(--spacing-md);color:var(--text-secondary);border-top:1px solid var(--border-color);background-color:var(--card-background);font-size:.875rem}@media (width<=640px){.app-header h1{font-size:1.5rem}.subtitle{font-size:.875rem}.header-content{text-align:center;flex-direction:column}.header-text{text-align:center}.app-main{padding:var(--spacing-md)}}:root{--primary-color:#2563eb;--primary-hover:#1d4ed8;--success-color:#10b981;--error-color:#ef4444;--text-primary:#1f2937;--text-secondary:#6b7280;--background:#f9fafb;--card-background:#fff;--border-color:#e5e7eb;--answer-hover-bg:#eff6ff;--answer-selected-bg:#dbeafe;--answer-correct-bg:#d1fae5;--answer-incorrect-bg:#fee2e2;--result-correct-bg:#d1fae5;--result-correct-text:#065f46;--result-incorrect-bg:#fee2e2;--result-incorrect-text:#991b1b;--spacing-xs:.25rem;--spacing-sm:.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--radius-sm:.375rem;--radius-md:.5rem;--radius-lg:.75rem;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a}[data-theme=dark]{--primary-color:#60a5fa;--primary-hover:#3b82f6;--success-color:#34d399;--error-color:#f87171;--text-primary:#f9fafb;--text-secondary:#d1d5db;--background:#111827;--card-background:#1f2937;--border-color:#374151;--answer-hover-bg:#1e3a5f;--answer-selected-bg:#1e40af;--answer-correct-bg:#064e3b;--answer-incorrect-bg:#7f1d1d;--result-correct-bg:#064e3b;--result-correct-text:#6ee7b7;--result-incorrect-bg:#7f1d1d;--result-incorrect-text:#fca5a5;--shadow-sm:0 1px 2px 0 #0000004d;--shadow-md:0 4px 6px -1px #00000080;--shadow-lg:0 10px 15px -3px #00000080}*{box-sizing:border-box;margin:0;padding:0}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--background);color:var(--text-primary);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;line-height:1.5}#root{flex-direction:column;min-height:100vh;display:flex}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}