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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

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

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header h1 {
    font-size: 48px;
    margin-bottom: 10px;
}

.header p {
    font-size: 18px;
    opacity: 0.9;
}

.filter-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 30px 0;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 25px;
    border: 2px solid #667eea;
    background: white;
    color: #667eea;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
}

.filter-btn:hover {
    background: #667eea;
    color: white;
}

.filter-btn.active {
    background: #667eea;
    color: white;
}

.apps-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.app-item {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.app-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 25px rgba(0,0,0,0.15);
}

.app-logo {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
}

.app-info {
    padding: 20px;
}

.app-name {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #333;
}

.app-description {
    font-size: 14px;
    color: #666;
    margin-bottom: 15px;
    max-height: 50px;
    overflow: hidden;
}

.app-buttons {
    display: flex;
    gap: 10px;
}

.download-btn {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
    font-size: 14px;
    text-decoration: none;
    text-align: center;
    display: inline-block;
}

.btn-android {
    background: #3dd65f;
    color: white;
}

.btn-android:hover {
    background: #2cad4a;
}

.btn-ios {
    background: #555;
    color: white;
}

.btn-ios:hover {
    background: #333;
}

.btn-disabled {
    background: #ccc;
    color: #999;
    cursor: not-allowed;
}

.btn-disabled:hover {
    background: #ccc;
}

.loading {
    text-align: center;
    padding: 60px 20px;
    color: #999;
    font-size: 18px;
}

.no-apps {
    text-align: center;
    padding: 80px 20px;
    color: #999;
}

.no-apps p {
    font-size: 18px;
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 32px;
    }
    
    .header p {
        font-size: 16px;
    }
    
    .apps-container {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 15px;
    }
    
    .app-buttons {
        flex-direction: column;
    }
}