body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f0f0f0;
    color: #000;
    text-align: center;
}

.theme-dark {
    background: #111;
    color: #fff;
}

.banner-img {
    width: 100%;
    max-width: 100%;
    display: block;
}

.hero {
    margin-top: 20px;
}

.hero-img {
    width: 90%;
    max-width: 900px;
    border-radius: 12px;
}

.mode-switch {
    margin: 20px;
}

.mode-switch button {
    padding: 10px 20px;
    margin: 5px;
    background: #ff1a1a;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.section-title {
    margin-top: 40px;
    font-size: 24px;
    font-weight: bold;
}

.app-grid, .dock {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding: 20px;
    max-width: 600px;
    margin: auto;
}

footer {
    margin-top: 40px;
    padding: 20px;
    background: #222;
    color: #fff;
}