:root {
    --spacing-small: 0.4rem;
    --spacing-middle: 1rem;
    --spacing-big: 1.5rem;
    --transition-speed: 0.2s;
    --color-white: white;
    --color-bg-dark: #1a1a2e;
    --color-btn: #1a1a2e;
    --color-accent: #e94560;
    --color-border: #ddd;
    --color-nav-link: #e9d42e;
    --color-tag-bg: #eee;
    --color-footer-muted: #aaa;
    --color-text-mid: #555;
    --color-text-light: #686868;
    --color-text-label: #444;
    --color-text-dark: #333;
}

* {
    margin: 0;
    padding: 0;
}

body {
    display: flex;
    justify-content: center;
}

h2,
h3,
h4 {
    color: var(--color-text-dark);
}

.flex-column {
    display: flex;
    flex-direction: column;
}

/* Grille principale */
#page {
    display: grid;
    grid-template-columns: 3fr 1fr;
    grid-template-rows: auto 1fr auto;
    grid-template-areas:
        "header header"
        "main   aside"
        "footer footer";
    gap: var(--spacing-big);
    max-width: 1200px;
    min-height: 100vh;
}

/* En-tête : flexbox en rangée */
header {
    grid-area: header;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--color-bg-dark);
    color: var(--color-white);
    padding: var(--spacing-middle);
}

.logo {
    font-size: var(--spacing-big);
    font-weight: 700;
    color: var(--color-accent);
}

nav {
    display: flex;
    gap: var(--spacing-big);
}

header nav a {
    color: var(--color-nav-link);
    text-decoration: none;
}

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

/* Contenu principal : grid avec zones nommées */
main {
    grid-area: main;
    gap: var(--spacing-big);
}

.featured,
.card,
.widget {
    border: 1px solid var(--color-border);
}

/* Article vedette : grille 2 colonnes avec flexbox imbriqué */
.featured {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.featured img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.featured-content {
    padding: var(--spacing-big);
    gap: var(--spacing-big);
}

.featured-content p {
    color: var(--color-text-mid);
}

.btn {
    background: var(--color-btn);
    color: var(--color-white);
    text-decoration: none;
    padding: var(--spacing-middle);
    border-radius: 4px;
    align-self: flex-end;
}

.btn:hover {
    background: var(--color-accent);
}

/* Grille de 3 cartes */
.articles {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-middle);
}

.card:hover {
    transform: translateY(-5px);
    transition: transform var(--transition-speed);
}

.card img {
    width: 100%;
    height: 140px;
    object-fit: cover;
}

.card-content {
    padding: var(--spacing-middle);
    margin: var(--spacing-small) 0;
}

.card-content p {
    color: var(--color-text-light);
}

/* Barre latérale */
aside {
    grid-area: aside;
    gap: var(--spacing-big);
}

.widget {
    padding: var(--spacing-middle);
}

.widget h4 {
    text-transform: uppercase;
    margin-bottom: var(--spacing-small);
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: var(--spacing-small);
}

.widget ul {
    list-style: none;
    gap: var(--spacing-small);
}

.widget ul a {
    text-decoration: none;
    color: var(--color-text-dark);
}

.widget ul a:hover {
    color: var(--color-accent);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-small);
}

.tag {
    font-size: 0.75rem;
    padding: var(--spacing-small);
    border-radius: 4px;
    text-transform: uppercase;
    background: var(--color-tag-bg);
    color: var(--color-text-mid);
    cursor: pointer;
    transition: background var(--transition-speed), color var(--transition-speed);
}

.tag:hover {
    background: var(--color-accent);
    color: var(--color-white);
}

/* Pied de page : grille 3 colonnes de tailles différentes */
footer {
    grid-area: footer;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-big);
    background: var(--color-bg-dark);
    color: var(--color-footer-muted);
    padding: var(--spacing-big);
}

footer h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-middle);
}

footer ul {
    list-style: none;
    gap: var(--spacing-small);
}

footer a {
    color: var(--color-footer-muted);
    text-decoration: none;
}

footer a:hover {
    color: var(--color-white);
}

/*  Mobile ( 768px) */
@media (max-width: 768px) {
    #page {
        grid-template-columns: 1fr;
        grid-template-areas:
            "header"
            "main"
            "aside"
            "footer";
    }

    .featured,
    .articles,
    footer {
        grid-template-columns: 1fr;
    }

}

/* Mode sombre */
@media (prefers-color-scheme: dark) {
    :root {
        --color-white: #e0e0e0;
        --color-bg-dark: #0d0d1a;
        --color-btn: #737388;
        --color-border: #444;
        --color-tag-bg: #2a2a3e;
        --color-text-mid: #aaa;
        --color-text-light: #999;
        --color-text-dark: #ccc;
    }

    body,
    .featured,
    .card,
    .widget {
        background: var(--color-bg-dark);
    }
}