/* =============================================================================
   Panel — botón hamburguesa accesible y sidebar colapsable.
   ============================================================================= */

/* Botón hamburguesa fijo en el top-bar (móvil y escritorio cuando se quiere) */
.panel-menu-btn {
    display: none;
    background: transparent;
    border: 2px solid currentColor;
    color: inherit;
    width: 44px;
    height: 44px;
    border-radius: 8px;
    padding: 0;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    margin-right: var(--space-3, 16px);
}
.panel-menu-btn:focus-visible {
    outline: 3px solid var(--color-accent, #d4af37);
    outline-offset: 3px;
}
.panel-menu-btn[aria-expanded="true"] {
    background: currentColor;
    color: var(--color-bg, #0d0d0d);
}
.panel-menu-btn svg {
    width: 22px;
    height: 22px;
    pointer-events: none;
}

/* Backdrop que cubre el contenido cuando el sidebar está abierto en móvil */
.panel-sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 90;
}

/* En pantallas estrechas: ocultar sidebar por defecto, mostrar al expandir */
@media (max-width: 900px) {
    .panel-menu-btn { display: inline-flex; }
    .panel-layout { display: block; }

    .panel-sidebar {
        position: fixed !important;
        top: 0;
        left: 0;
        bottom: 0;
        width: min(300px, 85vw);
        max-width: 300px;
        z-index: 100;
        overflow-y: auto;
        transform: translateX(-105%);
        transition: transform 0.2s ease-out;
        box-shadow: 2px 0 16px rgba(0, 0, 0, 0.4);
    }
    .panel-sidebar[data-open="true"] {
        transform: translateX(0);
    }
    .panel-sidebar-backdrop[data-open="true"] {
        display: block;
    }
    .panel-main {
        width: 100%;
        margin-left: 0;
    }

    /* Reducir animación si el usuario lo prefiere */
    .reduced-motion .panel-sidebar { transition: none; }
}

/* Skip-link al sidebar del panel */
.skip-to-sidebar {
    position: absolute;
    left: -9999px;
    top: 0;
}
.skip-to-sidebar:focus {
    left: 8px;
    top: 8px;
    padding: 8px 12px;
    background: var(--color-bg, #0d0d0d);
    color: var(--color-accent, #d4af37);
    text-decoration: underline;
    z-index: 200;
}