:root {
    --color-dark: #0C1618;
    --color-primary: #004643;
    --color-background: #FAF4D3;
    --color-secondary: #D1AC00;
    --color-accent: #F6BE9A;
    --colo-accent2: #e65100;
    --font-heading: 'Cambo', serif;
    --font-body: 'Chivo', sans-serif;
}

.cambo-regular {
    font-family: var(--font-heading);
    font-weight: 400;
    font-style: normal;
}

.chivo-regular {
    font-family: var(--font-body);
    font-weight: 300;
    font-style: normal;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-background);
    color: var(--color-dark);
    margin: 0;
    line-height: 1.6;
}

h1,
h2 {
    font-family: var(--font-heading);
    color: var(--color-primary);
}

main>h1 {
    grid-column: 1 / -1;
    text-align: center;
    font-family: var(--font-heading);
    font-size: 1.8rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.main-header {
    background-color: var(--color-primary);
    color: var(--color-background);
    padding: 1rem;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    position: relative;
}

.site-logo {
    width: 40px;
    height: 40px;
}

.site-name {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--color-background);
}

.hamburger {
    background: none;
    border: none;
    color: var(--color-background);
    font-size: 2rem;
    cursor: pointer;
    display: none;
}

.navigation {
    background-color: var(--color-primary);
    padding: 0.75rem;
}

.navigation a {
    color: var(--color-background);
    text-decoration: none;
    font-family: var(--font-body);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s, color 0.3s, transform 0.2s;
}

nav.navigation {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}

nav.navigation a:hover {
    background-color: var(--color-accent);
    color: var(--color-primary);
    transform: scale(1.05);
}

main {
    max-width: 960px;
    margin: 2rem auto;
    padding: 1rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.about-me {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.about-me p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-dark);
}

.image-card {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.image-card img {
    max-width: 100%;
    height: auto;
    border-radius: 5px;
}

.certificate-card {
    grid-column: span 2;
    background: var(--color-primary);
    color: var(--color-background);
    padding: 0.75rem;
    border-radius: 8px;
    margin-top: 1.5rem;
    font-size: 0.95rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.certificate-card h2 {
    color: var(--color-background);
    text-align: center;
    margin-bottom: 1rem;
}

.filter-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.filter-buttons button {
    background-color: var(--color-secondary);
    border: none;
    padding: 0.5rem 1rem;
    font-weight: bold;
    color: var(--color-dark);
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.filter-buttons button:hover {
    background-color: var(--color-accent);
}

dialog {
    border: 1px solid rgb(0 0 0 / 10%);
    border-radius: .25rem;
    padding: 1rem;
    background-color: #fff;
    box-shadow: 0 0 3rem #777;
    width: 90%;
    max-width: 600px;
}

::backdrop {
    background-color: rgb(0 0 0 / 50%);
}

dialog button {
    position: absolute;
    top: 23px;
    right: 23px;
    padding: .5rem 1rem;
    border: 1px solid rgb(0 0 0 / 10%);
}

.course-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.course-buttons button {
    padding: 1rem;
    border: none;
    font-weight: bold;
    font-family: var(--font-body);
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.course-buttons .cse {
    background-color: #e0f7fa;
    color: #006064;
}

.course-buttons .wdd {
    background-color: #fff3e0;
    color: var(--colo-accent2);
}

.course-buttons button:hover {
    transform: scale(1.05);
}

.course-card {
    font-family: var(--font-body);
    font-size: 0.95rem;
    padding: 0.5rem;
    margin: 0.5rem auto;
    max-width: 150px;
    text-align: center;
    font-weight: bold;
    border-radius: 6px;
    border: 2px solid var(--color-primary);
}

#course-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
}

footer {
    background-color: var(--color-primary);
    color: var(--color-background);
    text-align: center;
    padding: 1rem;
    font-size: 0.9rem;
}

#lastModified {
    color: var(--color-accent);
}

@media (max-width: 768px) {
    main {
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 1rem;
    }

    main>h1 {
        font-size: 1.4rem;
        text-align: center;
        margin-bottom: 1rem;
    }

    .course-work,
    .image-card,
    .certificate-card {
        width: 100%;
        max-width: 500px;
    }

    .header-container {
        flex-direction: row;
        justify-content: space-between;
    }

    .hamburger {
        display: block;
    }

    nav.navigation {
        display: none;
        flex-direction: column;
        align-items: center;
        width: 100%;
        padding: 1rem 0;
    }

    nav.navigation.open {
        display: flex;
    }

    nav.navigation a {
        display: block;
        text-align: center;
        padding: 1rem;
        background-color: var(--color-primary);
        color: var(--color-background);
        margin: 0.25rem 0;
        border-radius: 6px;
        width: 100%;
    }

    .filter-buttons {
        flex-direction: column;
        width: 100%;
        align-items: center;
    }

    .filter-buttons button {
        width: 80%;
        margin: 0.25rem 0;
    }

    #course-list {
        flex-direction: column;
        align-items: center;
    }

    .course-card {
        width: 80%;
    }

    footer {
        font-size: 0.85rem;
    }
}