.size-btn {
    border: 1px solid #e5e7eb;
}

.size-btn.active { 
    background-color: #2563eb !important; 
    color: white !important; 
    border-color: #2563eb !important;
    transform: scale(0.95);
}

.loader { 
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3b82f6;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite; 
}

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

.input-field {
    width: 100%;
    padding: 0.8rem;
    background-color: #f9fafb;
    border-radius: 0.75rem;
    outline: none;
    border: 1px solid #eee;
}

.btn-primary {
    width: 100%;
    background-color: #2563eb;
    color: white;
    padding: 1rem;
    border-radius: 1rem;
    font-weight: bold;
}

.btn-black {
    background-color: #000;
    color: #fff;
    padding: 1rem 2rem;
    border-radius: 0.75rem;
    font-weight: bold;
}