/* Page Settings */
:root {
    --bg: #f5f0e8;
    --text: #4a4238;
    --accent: #c97a5f;
    --accent-dark: #b8673d;
    --muted: #d4a574;
    --card-bg: #fffbf7;
    --button-text: #5d4037;
    --hover-bg: #f0e4d6;
    --shadow-accent: rgba(201,122,95,0.25);
    --shadow-accent-strong: rgba(201,122,95,0.35);
    --shadow-accent-sm: rgba(201,122,95,0.15);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
    color: var(--text);
    background-color: var(--bg);
    min-height: 100vh;
}

html {
    scroll-behavior: smooth;
}

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}


/* Header Section */
header {
    display: flex;
    align-items: center;
    flex-direction: row;
    justify-content: space-between;
    padding: 20px 20px 20px 20px;
    box-shadow: 0 0 15px var(--accent);
    border-bottom: 2px solid var(--accent);
    border-radius: 10px;
}

header p {
    font-size: 24px;
}

.right {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 40px;
}

.socials {
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    gap: 20px;
}

.socials p {
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--accent);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    transition: 0.5s;
    padding-top: 4px;
}

.socials a {
    color: var(--text);
}

.socials a:visited {
    color: var(--text);
}

.socials p:hover {
    background-color: var(--accent);
    color: var(--text);
    box-shadow: 0 0 15px var(--accent);
    border: 2px solid var(--accent-dark);
}

.hamburger {
    padding-top: 7.5px;
    font-size: 24px;
    cursor: pointer;
}


/* Sidebar Section */
.sidebar {
    position: fixed;
    top: 0;
    right: 0;
    width: 0;
    height: 100%;
    background-color: var(--accent);
    transition: width 0.7s ease;
    overflow: hidden;
    z-index: 999;
    border-left: 2px solid var(--accent-dark);
}

.sidebar.active {
    width: 320px;
}

body.sidebar-open {
    overflow: hidden;
}

.sidebar-content {
    width: 100%;
    max-width: 320px;
    height: 100%;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    font-weight: bold;
    box-sizing: border-box;
} 

.sidebar-content p {
    margin: 10px;
}

.sidebar-content h1 {
    margin: 10px;
}

.sidebar-btn {
    display: block;
    width: 100%;
    text-align: left;
    font-size: 18px;
    font-weight: bold;
    background: none;
    border: none;
    cursor: pointer;
    text-decoration: none;
    color: var(--card-bg);
    padding: 10px;
}

.sidebar-btn span {
    position: relative;
    display: inline-block;
    font-size: 15px;
}

.sidebar-btn span::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -4px;

    width: 100%;
    height: 2px;
    background-color: var(--text);

    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s ease;
}

.sidebar-btn:hover span::after {
    transform: scaleX(1);
}

.sidebar-btn:hover {
    color: var(--text);
}

.sidebar-dropdown {
    background-color: var(--card-bg);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.sidebar-dropdown a {
    display: block;
    padding: 10px 10px 10px 30px;
    color: var(--text);
    text-decoration: none;
    transition: background-color 0.2s ease;
    font-size: 15px;
    white-space: normal;
    overflow-wrap: anywhere;
    word-wrap: break-word;
    hyphens: auto;
}

.sidebar-dropdown a:hover {
    background-color: var(--accent);
}

body.sidebar-open {
    overflow: hidden;
}

.sidebar-divider {
    border: 1px solid var(--card-bg);
    margin: 15px 0px 15px 0px;
}

.sidebar-socials {
    display: flex;
    flex-direction: row;
    justify-content: center;
}

.sidebar-btn-social-links {
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    margin-right: 40px;
    font-size: 24px;
    gap: 20px;
}

.sidebar-btn-social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--text);
    border-radius: 50%;
    height: 30px;
    width: 30px;
    text-decoration: none;
    cursor: pointer;
    transition: 0.5s;
    color: var(--card-bg);
}

.sidebar-btn-social-links a:visited {
    color: var(--card-bg);
}

.sidebar-btn-social-links a:hover {
    background-color: var(--card-bg);
    color: var(--text);
    box-shadow: 0 0 15px rgba(201, 122, 95, 0.2);
}


/* Introduction Section */
.introduction {
    display: flex;
    justify-content: center;
    text-align: center;
    margin: 40px 0px 20px 0px;
}

.introduction h1 {
    font-size: 24px;
}

.introduction p {
    text-align: center;
    margin: 20px 180px 2px 180px;
}


/* Content Section */
.content {
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 2px solid var(--hover-clr);
    box-shadow: 0 0 15px var(--hover-clr);
    text-align: center;
    border-radius: 10px;
    color: var(--text);
    margin: 50px 60px 0px 60px;
    padding-bottom: 20px;
}

.content h1 {
    font-size: 18px;
}

.content p {
    font-size: 18px;
}

.content-teach {
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 2px solid var(--accent);
    box-shadow: 0 0 15px var(--shadow-accent);
    text-align: center;
    border-radius: 10px;
    color: var(--text);
    margin-top: 15px;
    margin-left: 60px;
    margin-right: 60px;
    padding: 20px;
}

.content-teach h1 {
    font-size: 20px;
}

.content-teach h2 {
    font-size: 18px;
}

.content-teach p {
    font-size: 16px;
}

.content-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.table-of-contents-btn {
    margin-bottom: 20px;
}

.download-exercise {
    margin-bottom: 20px;
}

.content-grid {
    display: grid;
    grid-template-columns: auto auto auto;
    gap: 10px;
    margin: 20px;
}

.card {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 400px;
    height: 100px;
    overflow: hidden;
    border-radius: 10px;
    text-decoration: none;
    border: 2px solid var(--accent-dark);
    box-shadow: 0 0 15px var(--accent);
    transform: translateY(0);
}

.card:hover {
    box-shadow: 0 0 20px var(--shadow-accent-strong);
    transform: translateY(-4px);
    font-weight: bold;
}

.card span {
    position: relative;
    display: inline-block;
    color: var(--text);
}

.card span:visited {
    color: var(--text);
}

.card p {
    font-size: 15px;
    font-weight: bold;
}

html,
body {
    overflow-x: hidden;
}

@media (max-width: 480px) {

    header {
        padding: 0 10px 0 10px;
        width: 100%;
        height: 56px;
    }

    .sidebar {
        top: 0;
        height: 100dvh;
    }

    .sidebar-btn {
        font-size: 15px;
    }

    .sidebar-btn span {
        font-size: 15px;
    }

    .sidebar-dropdown {
        font-size: 15px;
    }

    .sidebar-dropdown a {
        padding: 10px 10px 10px 10px;
        font-size: 15px;
    }

    .content {
        margin: 20px 10px;
        padding: 15px;
        margin: 20px 20px 40px 20px;
    }

    .content h1 {
        font-size: 18px;
    }

    .content-bookkeeping {
        margin: 20px 10px;
        padding: 15px;
        margin: 20px 20px 40px 20px;
    }

    .content-bookkeeping h1 {
        font-size: 18px;
    }

    .introduction {
        flex-direction: column;
        padding: 0 10px;
        border: 2px solid var(--hover-clr);
        box-shadow: 0 0 15px var(--hover-clr);
        border-radius: 10px;
        margin: 40px 20px 20px 20px;
    }

    .introduction h1 {
        padding-left: 0;
        font-size: 18px;
    }

    .introduction p {
        margin: 10px 0;
        font-size: 14px;
    }

    .content-grid {
        grid-template-columns: 1fr;
    }

    .card {
        width: 100%;
        padding: 0 20px 0 20px;
    }

    .socials {
        display: none;
    }

    .footer {
        display: none;
    }
}