:root{--color-primary:#2563eb;--color-primary-hover:#1d4ed8;--color-success:#22c55e;--color-success-hover:#16a34a;--color-error:#ef4444;--color-error-hover:#dc2626;--color-warning:#f59e0b;--color-background:#fff;--color-surface:#f3f4f6;--color-surface-hover:#e5e7eb;--color-text:#1f2937;--color-text-secondary:#6b7280;--color-border:#d1d5db;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--radius-full:9999px;--font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,sans-serif}.dark{--color-background:#111827;--color-surface:#1f2937;--color-surface-hover:#374151;--color-text:#f9fafb;--color-text-secondary:#9ca3af;--color-border:#374151}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{background-color:#fff;background-color:var(--color-background);color:#1f2937;color:var(--color-text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;font-family:var(--font-family);line-height:1.5;min-height:100vh;transition:background-color .2s ease,color .2s ease}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.25;margin-bottom:.5em}h1{font-size:1.875rem}h2{font-size:1.5rem}h3{font-size:1.25rem}h4{font-size:1.125rem}p{margin-bottom:1rem}a{color:#2563eb;color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font-family:inherit;font-size:inherit}button:focus,input:focus,select:focus,textarea:focus{outline:2px solid #2563eb;outline:2px solid var(--color-primary);outline-offset:2px}.sr-only{clip:rect(0,0,0,0);border:0;height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;white-space:nowrap;width:1px}.app-loading{align-items:center;background-color:#fff;background-color:var(--color-background);display:flex;justify-content:center;min-height:100vh}.spinner{border:3px solid #d1d5db;border-top-color:#2563eb;border:3px solid var(--color-border);border-radius:50%;border-top-color:var(--color-primary);height:40px;width:40px}.spinner,.spinner-small{animation:spin 1s linear 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auto;max-width:800px;padding:1rem 1rem 5rem;width:100%}.bottom-nav{background-color:var(--color-surface);border-top:1px solid var(--color-border);bottom:0;display:flex;justify-content:space-around;left:0;padding:.5rem 0;position:fixed;right:0;z-index:100}.bottom-nav-item{align-items:center;border-radius:var(--radius-md);color:var(--color-text-secondary);display:flex;flex-direction:column;font-size:.75rem;min-width:64px;padding:.5rem 1rem;text-decoration:none;transition:color .2s,background-color .2s}.bottom-nav-item:hover{background-color:var(--color-surface-hover);text-decoration:none}.bottom-nav-item.active{color:var(--color-primary)}.bottom-nav-icon{font-size:1.5rem;margin-bottom:.25rem}.btn{align-items:center;border:none;border-radius:var(--radius-md);cursor:pointer;display:inline-flex;font-size:1rem;font-weight:500;gap:.5rem;justify-content:center;padding:.75rem 1.5rem;text-decoration:none;transition:background-color .2s,transform .1s}.btn:active{transform:scale(.98)}.btn:disabled{cursor:not-allowed;opacity:.5}.btn-primary{background-color:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--color-primary-hover)}.btn-success{background-color:var(--color-success);color:#fff}.btn-success:hover:not(:disabled){background-color:var(--color-success-hover)}.btn-error{background-color:var(--color-error);color:#fff}.btn-error:hover:not(:disabled){background-color:var(--color-error-hover)}.btn-outline{background-color:initial;border:2px solid var(--color-border);color:var(--color-text)}.btn-outline:hover:not(:disabled){background-color:var(--color-surface)}.btn-block{width:100%}.btn-icon{min-height:44px;min-width:44px;padding:.5rem}.form-group{margin-bottom:1rem}.form-label{color:var(--color-text);display:block;font-weight:500;margin-bottom:.5rem}.form-input{background-color:var(--color-background);border:1px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text);font-size:1rem;padding:.75rem 1rem;transition:border-color .2s;width:100%}.form-input:focus{border-color:var(--color-primary)}.form-input.error{border-color:var(--color-error)}.form-error{color:var(--color-error)}.form-error,.form-hint{font-size:.875rem;margin-top:.25rem}.form-hint{color:var(--color-text-secondary)}.card{background-color:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:1rem}.card-clickable{cursor:pointer;transition:transform .2s,box-shadow .2s}.card-clickable:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.card-last-used{border:2px solid var(--color-primary);position:relative}.card-last-used:before{background:linear-gradient(135deg,#2563eb0d,#0000 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.5rem}.badge-primary{background-color:var(--color-primary);color:#fff}.badge-success{background-color:var(--color-success);color:#fff}.auth-container{align-items:center;background-color:var(--color-background);display:flex;justify-content:center;min-height:100vh;padding:1rem}.auth-card{background-color:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);max-width:400px;padding:2rem;width:100%}.auth-title{margin-bottom:1.5rem;text-align:center}.auth-logo{color:var(--color-primary);font-size:2.5rem;margin-bottom:1rem;text-align:center}.auth-links{font-size:.875rem;margin-top:1rem;text-align:center}.page-header{align-items:center;display:flex;justify-content:space-between;margin-bottom:1.5rem}.page-title{font-size:1.5rem;font-weight:700}@media (min-width:768px){.main-content{padding:2rem 2rem 6rem}.flashcard{height:300px}.flashcard-face{font-size:2rem}}@media (min-width:1024px){.main-content{padding-bottom:6rem}}
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