main.css

/* main.css */
:root {
    --header-height: 60px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Nunito', Arial, sans-serif;
    font-size: 16px;
    background-color: #f0f0f0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.notebook-page {
    background-color: white;
    padding: 10px 20px;
    border-radius: 0 0 5px 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    height: var(--header-height);
    z-index: 1000;
}

.notebook-page::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: #ff9999;
}

.notebook-page h1 {
    margin: 0;
    font-size: clamp(1rem, 5vw, 1.5rem);
    color: #333;
}

.content {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: calc(var(--header-height) + 20px) 20px 20px;
    min-height: 100vh;
}

.logo {
    max-width: 90%;
    max-height: 90vh;
    object-fit: contain;
}

@media (max-width: 768px) {
    :root {
        --header-height: 50px;
    }

    .notebook-page {
        padding: 5px 10px;
    }

    .content {
        padding-top: calc(var(--header-height) + 10px);
    }
}

@media (max-width: 480px) {
    :root {
        --header-height: 40px;
    }

    .notebook-page h1 {
        font-size: clamp(0.875rem, 4vw, 1.25rem);
    }
}