/* ==========================================================================
   TUTORIALES — reskineado al shell oscuro compartido de RaumLab (antes esta
   página tenía su propia estética clara/Georgia, sin header/nav/footer
   compartidos — quedaba desalineada del resto de in_SITE y de los otros dos
   módulos). Layout: lista de modos a la izquierda (.instr-nav, nunca
   scrollea) + panel de contenido al centro (.instr-panel, sí puede) —
   mismo patrón que espacio_INM/trans_FORMA, con position:fixed en vez de
   flex:1 porque acá no hay un contenedor de SPA que ya resuelva el alto
   (mismo criterio que #editor-layout/#viewer-layout de module-shell.css).
   ========================================================================== */

.instr-layout {
    display: flex;
    align-items: stretch;
    gap: 56px;
    width: 100vw;
    height: calc(100vh - var(--header-h) - var(--footer-h));
    position: fixed;
    top: var(--header-h);
    left: 0;
    padding: 36px 48px;
    box-sizing: border-box;
    background: transparent;
    color: var(--text-color);
}

.instr-nav {
    width: 300px;
    flex-shrink: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 0 25px;
}

.instr-nav-item {
    display: block;
    width: 100%;
    text-align: left;
    font-family: var(--font-geist);
    font-size: 0.82rem;
    font-weight: 300;
    color: var(--text-color);
    background: none;
    border: none;
    border-left: 2px solid transparent;
    padding: 10px 0 10px 14px;
    cursor: pointer;
    transition: font-weight 0.2s ease, border-color 0.2s ease;
}
.instr-nav-item:hover { font-weight: 500; }
.instr-nav-item.active {
    border-left-color: var(--text-color);
    font-weight: 500;
}

.instr-panel {
    flex: 1;
    min-width: 0;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border-fine) transparent;
    padding-right: 12px;
}
.instr-panel::-webkit-scrollbar { width: 3px; }
.instr-panel::-webkit-scrollbar-track { background: transparent; }
.instr-panel::-webkit-scrollbar-thumb { background: var(--border-fine); }
.instr-panel::-webkit-scrollbar-thumb:hover { background: var(--text-color); }

.instr-body { display: none; max-width: 640px; }
.instr-body.active { display: block; }

.instr-body h2 {
    font-family: var(--font-geist);
    font-size: 1rem;
    font-weight: 300;
    letter-spacing: 0.03em;
    color: var(--text-color);
    margin: 0 0 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-fine);
}

.instr-body h3 {
    font-family: var(--font-geist);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-color);
    margin: 24px 0 10px;
}

.instr-body p {
    font-family: var(--font-geist);
    font-size: 0.88rem;
    font-weight: 300;
    line-height: 1.7;
    color: var(--text-color);
    margin: 0 0 12px;
}

.instr-body strong { font-weight: 500; }

.instr-body code {
    font-family: monospace;
    background: rgba(242, 239, 233, 0.1);
    border: 1px solid var(--border-fine);
    border-radius: 3px;
    padding: 1px 6px;
    font-size: 0.85em;
}

.instr-body ol { padding-left: 20px; }

.instr-body li {
    font-family: var(--font-geist);
    font-size: 0.88rem;
    font-weight: 300;
    line-height: 1.7;
    color: var(--text-color);
    margin-bottom: 10px;
}

@media (max-width: 768px) {
    .instr-layout {
        position: relative;
        top: 0;
        flex-direction: column;
        width: 100%;
        height: auto;
        min-height: calc(100vh - var(--header-h) - var(--mobile-bottom-reserve));
        gap: 24px;
        padding: calc(var(--header-h) + 20px) 20px var(--mobile-bottom-reserve);
    }

    .instr-nav {
        width: 100%;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 4px 20px;
        padding: 0;
    }

    .instr-panel {
        overflow-y: visible;
        padding-right: 0;
    }
}