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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
    min-height: 100vh;
}

header {
    background: rgba(255, 255, 255, 0.95);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    flex-wrap: wrap;
}

h1 {
    color: #4a5568;
    font-size: 1.8rem;
    font-weight: 600;
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

h1 .subtitle {
    font-size: 0.9rem;
    font-weight: 400;
    color: #718096;
}

.hero-section {
    text-align: center;
    padding: 3rem 0;
    background: white;
    border-radius: 15px;
    margin-bottom: 2rem;
}

.hero-section h2 {
    font-size: 2.5rem;
    color: #2d3748;
    margin-bottom: 1rem;
}

.hero-section p {
    font-size: 1.2rem;
    color: #718096;
}

.main-nav {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.main-nav a {
    color: #4a5568;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.main-nav a:hover {
    color: #667eea;
}


main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

#app-container {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    min-height: 400px;
}

.ad-container {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}



footer {
    text-align: center;
    padding: 2rem;
    background: white;
    border-top: 1px solid #e2e8f0;
}


@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    main {
        padding: 0 1rem;
    }

    #app-container, .ad-container {
        padding: 1rem;
    }
}