* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: #f3f5f7;
    color: #202124;
    font-family:
        Arial,
        "Noto Sans Arabic",
        sans-serif;
    line-height: 1.8;
}

.top,
.home-header {
    background: #1f2937;
    color: white;
    padding: 25px;
}

.home-header {
    text-align: center;
}

.home-header h1 {
    margin: 0;
    font-size: 34px;
}

.home-header p {
    margin: 5px 0 0;
}

.top {
    position: sticky;
    top: 0;
    z-index: 10;
}

.top h1 {
    max-width: 1100px;
    margin: 10px auto 0;
}

.back {
    color: white;
    text-decoration: none;
}

main {
    width: min(1100px, 94%);
    margin: 30px auto;
}

main > section {
    background: white;
    padding: 25px;
    margin-bottom: 25px;
    border-radius: 14px;
}

h2 {
    margin-top: 0;
}

.lesson-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.lesson-list a {
    display: block;
    padding: 15px 18px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background: #fafafa;
    color: #202124;
    text-decoration: none;
    transition: 0.15s;
}

.lesson-list a:hover {
    background: #eeeeee;
}

.contents {
    border-right: 5px solid #374151;
}

.toc {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.toc a {
    padding: 8px 14px;
    border: 1px solid #ddd;
    border-radius: 8px;
    color: #202124;
    text-decoration: none;
}

.notice {
    background: #fff8df !important;
}

.page {
    background: white;
    margin: 25px 0;
    padding: 30px;
    border-radius: 14px;
}

.page-number {
    color: #777;
    font-size: 14px;
    margin-bottom: 20px;
}

.language {
    margin: 25px 0;
    padding: 22px;
    border-radius: 10px;
}

.language-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 15px;
}

.french {
    direction: ltr;
    text-align: left;
    background: #f7f7f7;
}

.arabic {
    direction: rtl;
    text-align: right;
    background: #f7f7f7;
}

.english {
    direction: ltr;
    text-align: left;
    background: #f7f7f7;
}

.translation-placeholder {
    color: #777;
    font-style: italic;
}

figure {
    margin: 30px auto;
    text-align: center;
}

figure img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

figcaption {
    color: #777;
    font-size: 13px;
}

@media (max-width: 600px) {

    main {
        width: 96%;
    }

    .page {
        padding: 16px;
    }

    .language {
        padding: 15px;
    }

    .home-header h1 {
        font-size: 27px;
    }
}