:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
}

body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f5f6fa;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
    padding: 30px;
}

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

.nav {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    justify-content: center;
}

.nav-button {
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background-color: var(--primary-color);
    color: white;
    transition: all 0.3s ease;
}

.nav-button:hover {
    background-color: var(--secondary-color);
}

.section {
    display: none;
    padding: 20px;
    border: 1px solid #ecf0f1;
    border-radius: 5px;
    margin-top: 20px;
}

.section.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--primary-color);
    font-weight: 500;
}

input {
    width: 100%;
    padding: 10px;
    border: 1px solid #bdc3c7;
    border-radius: 5px;
    box-sizing: border-box;
}

.action-button {
    background-color: var(--success-color);
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.action-button:hover {
    background-color: #219a52;
}

.action-button.danger {
    background-color: var(--danger-color);
}

.action-button.danger:hover {
    background-color: #c0392b;
}

.account-info {
    margin-top: 30px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 5px;
    border-left: 4px solid var(--secondary-color);
}

.success-message {
    background-color: #d4edda;
    color: #155724;
    padding: 15px;
    border-radius: 5px;
    margin-top: 20px;
    display: none;
}

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