:root {
    --primary-color: #2c3e50;
    --secondary-color: #e74c3c;
    --accent-color: #f39c12;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    color: var(--dark-color);
    line-height: 1.6;
}

.main-container {
    max-width: 500px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 2rem;
    position: relative;
}

h1::after {
    content: '';
    position: absolute;
    width: 100px;
    height: 3px;
    background-color: var(--accent-color);
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.form-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
}

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

.register-link a {
    color: var(--secondary-color);
    text-decoration: none;
}

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

.error-message {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.alert {
    padding: 0.75rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: 0.25rem;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.password-container {
    position: relative;
}

.toggle-password {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--primary-color);
}

.form-group {
    position: relative;
}

.form-group .toggle-password {
    position: absolute;
    top: 70%;
    transform: translateY(-50%);
    right: 15px;
    cursor: pointer;
}

.checkbox {
    position: absolute;
    top: 45%;
    transform: translateY(-50%);
    right: 100px;
    cursor: pointer;
}