:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --accent-color: #e74c3c;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--light-color);
    color: var(--dark-color);
    line-height: 1.6;
}

header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem 0;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 800px;
    margin: 0 auto;
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    padding: 40px 0;
}

.app-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.app-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.app-image {
    height: 180px;
    background-color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
}

.app-content {
    padding: 20px;
}

.app-title {
    font-size: 1.4rem;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.app-description {
    color: #666;
    margin-bottom: 20px;
}

.app-link {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s ease;
    cursor: pointer;
}

.app-link:hover {
    background-color: var(--secondary-color);
}

footer {
    background-color: var(--dark-color);
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-top: 40px;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    overflow: auto;
}

.modal-content {
    position: relative;
    background-color: white;
    margin: 2% auto;
    padding: 0;
    width: 90%;
    max-width: 1000px;
    height: auto;
    min-height: 80vh;
    border-radius: 8px;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.3);
    animation: modalopen 0.3s;
}

#appFrame {
    width: 100%;
    height: 75vh;
    border: none;
    border-radius: 4px;
    background: white;
}

@keyframes modalopen {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.close-btn {
    position: absolute;
    right: 20px;
    top: 10px;
    font-size: 28px;
    font-weight: bold;
    color: #aaa;
    cursor: pointer;
    z-index: 1001;
    transition: all 0.3s;
}

.close-btn:hover {
    color: var(--accent-color);
    transform: scale(1.1);
}

/* Loading indicator */
.modal-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--primary-color);
    font-size: 1.5rem;
}

@media (max-width: 992px) {
    .modal-content {
        width: 95%;
        margin: 1% auto;
    }
    
    #appFrame {
        height: 70vh;
    }
}

@media (max-width: 768px) {
    .apps-grid {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .modal-content {
        width: 98%;
        padding: 0;
    }
    
    .close-btn {
        right: 15px;
        top: 10px;
        font-size: 24px;
    }
    
    #appFrame {
        height: 65vh;
    }
}