:root {
    --font-family: 'Roboto', sans-serif;
    --background-color: #f4f4f9;
    --text-color: #333;
    --header-footer-bg-color: #000000;
    --header-footer-text-color: #fff;
    --link-hover-color: #ffeb3b;
    --card-bg-color: #fff;
    --card-text-color: #333;
    --card-hover-bg-color: #0056b3;
    --card-border-radius: 20px;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --card-hover-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    --container-max-width: 1200px;
    --container-padding: 20px;
    --filter-bg-color: #fff;
    --filter-text-color: #333;
    --filter-border-radius: 8px;
    --filter-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --title-color: #333;
    --title-font-size: 2.5em;
    --title-font-weight: 700;
    --subtitle-color: #000000;
    --subtitle-font-size: 1.5em;
    --subtitle-font-weight: 500;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.container {
    max-width: var(--container-max-width);
    width: 100%;
    padding: var(--container-padding);
    box-sizing: border-box;
}

header {
    width: 100%;
    background-color: var(--header-footer-bg-color);
    color: var(--header-footer-text-color);
    padding: 15px 0;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    box-sizing: border-box;
}

.logo {
    font-size: 1.5em;
    font-weight: 700;
}

nav {
    display: flex;
    gap: 15px;
}

nav a {
    color: var(--header-footer-text-color);
    text-decoration: none;
    font-size: 1em;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--link-hover-color);
}

h1 {
    text-align: center;
    margin-bottom: 20px;
    color: var(--title-color);
    font-size: var(--title-font-size);
    font-weight: var(--title-font-weight);
}

.filter {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
    gap: 10px;
}

.filter select, .filter input {
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ddd;
    border-radius: var(--filter-border-radius);
    background-color: var(--filter-bg-color);
    color: var(--filter-text-color);
    outline: none;
    transition: border-color 0.3s ease, background-color 0.3s ease, color 0.3s ease;
    box-shadow: var(--filter-shadow);
}

.filter select:focus, .filter input:focus {
    border-color: var(--header-footer-bg-color);
}

.articles {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: center;
}

.card {
    background-color: var(--card-bg-color);
    color: var(--card-text-color);
    border-radius: var(--card-border-radius);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
    width: calc(33.333% - 30px);
    max-width: 350px;
    margin-bottom: 20px;
}

.card img {
    width: 100%;
    height: 262px;
    display: block;
    object-fit: cover;
}

.card-content {
    padding: 20px;
}

.card-content h3 {
    margin: 0 0 10px;
    font-size: var(--subtitle-font-size);
    color: var(--subtitle-color);
    font-weight: var(--subtitle-font-weight);
}

.card-content p {
    margin: 0;
    color: #666;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--card-hover-shadow);
}

.card-content a {
    text-decoration: none;
    color: var(--subtitle-color);
    transition: color 0.3s ease;
}

.card-content a:hover {
    color: var(--card-hover-bg-color);
}

.pagination {
    display: flex;
    justify-content: center;
    margin-top: 20px;
}

.pagination button {
    background-color: var(--header-footer-bg-color);
    color: var(--header-footer-text-color);
    border: none;
    padding: 10px 15px;
    margin: 0 5px;
    border-radius: var(--filter-border-radius);
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.pagination button:hover {
    background-color: var(--card-hover-bg-color);
    color: var(--link-hover-color);
}

.pagination button.active {
    background-color: var(--link-hover-color);
    color: var(--header-footer-bg-color);
}

footer {
    width: 100%;
    background-color: var(--header-footer-bg-color);
    color: var(--header-footer-text-color);
    padding: 15px 0;
    text-align: center;
}

footer p {
    margin: 0;
    font-weight: 500;
}

@media (max-width: 768px) {
    .card {
        width: calc(50% - 30px);
    }
}

@media (max-width: 480px) {
    .card {
        width: 100%;
        max-width: none;
    }
}



#search-keyword{
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ddd;
    border-radius: var(--filter-border-radius);
    background-color: var(--filter-bg-color);
    color: var(--filter-text-color);
    outline: none;
    transition: border-color 0.3s ease, background-color 0.3s ease, color 0.3s ease;
    box-shadow: var(--filter-shadow);
    margin-left: 30px;
    width: 40%;
}

/* Styling for the checkbox */
.filter label {
    display: inline-flex;
    align-items: center;
    font-size: 1rem;
    cursor: pointer;
    margin-left: 10px;
}

.filter input[type="checkbox"] {
    appearance: none;
    width: 40px;
    height: 20px;
    background-color: #ccc;
    border-radius: 15px;
    position: relative;
    outline: none;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.filter input[type="checkbox"]::before {
    content: '';
    width: 18px;
    height: 18px;
    background-color: white;
    border-radius: 50%;
    position: absolute;
    top: 1px;
    left: 1px;
    transition: transform 0.3s ease;
}

.filter input[type="checkbox"]:checked {
    background-color: black;
}

.filter input[type="checkbox"]:checked::before {
    transform: translateX(20px);
}

.filter label span {
    margin-left: 8px;
    font-weight: 500;
    color: #333;
}