.auth-container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    overflow: hidden;
    max-width: 400px;
    width: 100%;
    animation: slideIn 0.5s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 2rem;
    text-align: center;
    color: white;
}

.login-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.login-header p {
    opacity: 0.9;
    font-size: 0.9rem;
}

.login-form {
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #333;
}

input[type="text"],
input[type="password"],
input[type="email"] {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
    font-family: inherit;
}

input:focus {
    outline: none;
    border-color: #667eea;
}

.btn-login {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-login:active {
    transform: translateY(0);
}

.error-message {
    background: #fee;
    color: #c33;
    padding: 0.75rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    display: none;
    border-left: 4px solid #c33;
}

.error-message.show {
    display: block;
    animation: shake 0.5s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.back-link {
    text-align: center;
    margin-top: 1.5rem;
}

.back-link a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.back-link a:hover {
    color: #764ba2;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.remember-me input[type="checkbox"] {
    width: auto;
}

.remember-me label {
    margin: 0;
    font-weight: normal;
    cursor: pointer;
}

@media (max-width: 768px) {
    .login-header h1 {
        font-size: 1.5rem;
    }
    
    body {
        padding: 1rem;
    }
}