:root {
    --google-blue: #4285F4;
    --google-red: #EA4335;
    --google-yellow: #FBBC05;
    --google-green: #34A853;
}

/* Animations */
.fade-in {
    animation: fadeIn 0.3s ease-in-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.shake {
    animation: shake 0.5s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

.button-loading {
    position: relative;
    pointer-events: none;
}

.button-loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Form elements */
input:focus {
    box-shadow: 0 0 0 2px rgba(66, 133, 244, 0.3);
    outline: none;
}

.border-red-500 {
    border-color: var(--google-red) !important;
}

.text-red-500 {
    color: var(--google-red);
}

.text-blue-600 {
    color: var(--google-blue);
}