body {
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.main-container {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
}

.welcome-section {
    text-align: center;
    margin-bottom: 30px;
}

.welcome-section h2 {
    color: #333;
    margin: 0 0 10px 0;
}

.welcome-section p {
    color: #666;
    margin: 0;
}

.login-options {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
}

.login-option {
    flex: 1;
    padding: 12px 0;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: #666;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.3s ease;
}

.login-option.active {
    color: #2196F3;
    border-bottom-color: #2196F3;
}

.login-panels {
    position: relative;
}

.login-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.login-panel.active {
    display: block;
}

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

.input-group {
    margin-bottom: 20px;
    position: relative;
}

.input-group label {
    display: flex;
    align-items: center;
    color: #666;
    margin-bottom: 8px;
}

.input-group i {
    margin-right: 8px;
    color: #2196F3;
}

.input-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: #2196F3;
}

.validation-message {
    color: red;
    font-size: 12px;
    display: none;
    margin-top: 5px;
}

.form-actions {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.password-reset-link {
    color: #2196F3;
    text-decoration: none;
    font-size: 14px;
    align-self: flex-end;
}

.password-reset-link:hover {
    text-decoration: underline;
}

.submit-button {
    width: 100%;
    padding: 14px;
    background-color: #2196F3;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.submit-button:hover {
    background-color: #1976D2;
}

.registration-link {
    text-align: center;
    margin-top: 20px;
    color: #666;
}

.registration-link a {
    color: #2196F3;
    text-decoration: none;
    font-weight: bold;
}

.registration-link a:hover {
    text-decoration: underline;
}

.input-valid {
    border: 1px solid green;
}

.input-invalid {
    border: 1px solid red;
}