:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --background-color: #f5f6fa;
    --error-color: #e74c3c;
    --success-color: #2ecc71;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--primary-color);
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.overlay-content {
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    width: 90%;
    max-width: 400px;
    text-align: center;
}

.overlay h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.hidden {
    display: none !important;
}

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

.form-group {
    margin-bottom: 1.5rem;
    flex: 1;
}

.form-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

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

input, select {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

button {
    display: block;
    width: 100%;
    padding: 1rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #2980b9;
}

.error {
    border-color: var(--error-color);
}

.error-message {
    color: var(--error-color);
    font-size: 0.9rem;
    margin-top: 0.3rem;
}

@media (max-width: 768px) {
    .container {
        margin: 1rem;
        padding: 1rem;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }
}

.loading {
    opacity: 0.7;
    pointer-events: none;
}

.success-message {
    color: var(--success-color);
    text-align: center;
    margin-top: 1rem;
    font-weight: 600;
}

#password {
    margin-bottom: 1rem;
}