article>header,
main>header {
    position: relative;
    z-index: 10;
    width: 90%;
    max-width: 1200px;
    margin: 0 auto 2rem auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: .5rem 1rem;
    background:
        radial-gradient(circle at top left, var(--bg-white-12) 0%, var(--transparent) 60%),
        linear-gradient(to bottom, var(--surface-charcoal), var(--surface-onyx));
    border-radius: 0 0 2rem 2rem;
    box-shadow: 0 8px 20px var(--overlay-black-60);
    gap: 1rem;

    .site-logo {
        flex-shrink: 0;
        margin: auto;
    }

    .header-content {
        flex: 1;
        min-width: 200px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        color: var(--text-white);
    }

    .page-title {
        font-size: 1.5rem;
        margin: 0;
        font-weight: 600;
    }

    .page-meta {
        font-size: 0.875rem;
        margin-top: .25rem;
        opacity: 0.8;
        display: flex;
        flex-wrap: wrap;
        gap: 0.75rem;
    }
}

.tablet-header {
    position: sticky;
    top: 0;
    z-index: 9;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 85%;
    max-width: 1140px;
    margin: -4.5rem auto 2rem auto;
    padding: 0.4rem 1rem;
    height: 2.5rem;

    background-color: var(--surface-elevated);

    background-image:
        /* Stries métalliques irrégulières */
        repeating-linear-gradient(to right,
            var(--header-metal-stripe-strong) 0%,
            var(--header-metal-stripe-strong) 4%,
            var(--header-metal-stripe-highlight) 5%,
            var(--header-metal-stripe-strong) 6%),
        /* Stries secondaires plus douces */
        repeating-linear-gradient(to right,
            var(--header-metal-stripe-soft) 0%,
            var(--header-metal-stripe-soft) 2%,
            var(--header-metal-stripe-soft-highlight) 3%,
            var(--header-metal-stripe-soft) 4%),
        /* Effet d'ombrage et reflet léger */
        linear-gradient(to bottom,
            var(--header-metal-gradient-top) 0%,
            var(--header-metal-gradient-mid) 47%,
            var(--header-metal-gradient-top) 53%,
            var(--header-metal-gradient-bottom) 100%);

    background-size: 200px 100%;
    background-repeat: repeat;

    border-radius: 0 0 1rem 1rem;
    box-shadow: 0 4px 12px var(--overlay-black-50);
    overflow: hidden;

    .tablet-links {
        display: flex;
        flex-wrap: wrap;
        gap: .5rem;

        .tablet-link {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.4rem 0.8rem;
            border-radius: 999px;
            background: var(--surface-elevated);
            color: var(--text-light);
            text-decoration: none;
            border: 1px solid var(--transparent);
            font-size: 0.85rem;
            line-height: 1;
            transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
        }

        .tablet-link:hover,
        .tablet-link:focus-visible {
            background-color: var(--surface-elevated-hover);
            color: var(--text-white);
        }

        .tablet-link:focus-visible {
            outline: 2px solid var(--accent-blue);
            outline-offset: 3px;
            border-color: var(--transparent);
        }

        .tablet-link:focus:not(:focus-visible) {
            outline: none;
        }

        .tablet-link-icon {
            font-size: 1rem;
            line-height: 1;
        }

        .tablet-menu {
            position: relative;
            display: inline-flex;
            flex-direction: column;
            align-items: stretch;
        }

        .tablet-menu[open] .tablet-link {
            background-color: var(--border-dark);
            color: var(--text-white);
        }

        .tablet-menu summary {
            list-style: none;
            cursor: pointer;
        }

        .tablet-menu summary::-webkit-details-marker,
        .tablet-menu summary::marker {
            display: none;
        }
    }

    .tablet-logo {
        height: 32px;
        flex-shrink: 0;
    }

    .tablet-title {
        font-size: 0.9rem;
        font-weight: 500;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        color: var(--text-dim);
        flex: 1;
    }

    #toc {
        position: relative;

        #TableOfContents {
            position: fixed;
            top: 2.5rem;
            z-index: 8;
            width: clamp(300px, 50vw, 600px);
            max-height: 50vh;
            right: 0;
            margin: 0 auto;
            background-color: var(--surface-elevated);
            border: 1px solid var(--border-panel);
            border-radius: 0.5rem;
            box-shadow: 0 0 10px var(--overlay-black-40);
            overflow: auto;
            padding: 1rem;
            scrollbar-width: thin;
            scrollbar-color: var(--scrollbar-thumb) var(--surface-elevated);
        }

        #TableOfContents ul {
            list-style: none;
            padding-left: 1rem;
        }

        #TableOfContents li {
            margin: 0.25rem 0;
        }

        #TableOfContents a {
            text-decoration: none;
            color: var(--text-light);
            transition: color 0.2s ease;
            display: block;
        }

        #TableOfContents a:hover {
            color: var(--accent-blue);
            text-decoration: underline;
        }
    }
}