/* Base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

body {
    font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    background-color: #f0f8ff;
    min-height: 100vh;
}

/* App container */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.app-header {
    text-align: center;
    margin: 20px 0;
    color: #2c3e50;
}

.app-header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 700;
}

/* App grid */
.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    padding: 20px;
}

/* App cards */
.app-card {
    background-color: white;
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    text-decoration: none;
    color: #2c3e50;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.app-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.app-icon {
    font-size: 3em;
    margin-bottom: 10px;
}

.app-card h2 {
    margin-bottom: 10px;
    color: #2c3e50;
    font-weight: 700;
}

.app-card p {
    color: #7f8c8d;
    font-size: 1.1em;
    font-weight: 400;
}

/* Back button */
.back-button {
    position: fixed;
    top: 20px;
    left: 20px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s ease;
    font-weight: 700;
}

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

/* Responsive design */
@media (max-width: 768px) {
    .app-grid {
        grid-template-columns: 1fr;
        padding: 10px;
    }

    .app-header h1 {
        font-size: 2em;
    }

    .back-button {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }
}