#header {
    display: flex;
    padding: 1.2rem clamp(1.2rem, 4vw, 2.5rem);
    background-color: #0a0a0a;
    transition: background-color 0.4s ease, box-shadow 0.4s ease;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 50;
}

/* Cuando el usuario hace scroll, el header se vuelve sólido */
#header.scrolled {
    background-color: #0a0a0a;
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.07);
}

#header img {
    width: 200px;
    height: auto;
    transition: all 0.3s ease;
}

#header img:hover {
    width: 205px;
}

#header-btn-img {
    display: flex;
    align-items: center;
    gap: 50px;
}

#redes {
    display: flex;
    gap: 8px;
    transition: all 0.1s ease;
}

#redes a:hover {
    opacity: 0.5;
    border-radius: 50%;
    height: 47px;
    transition: all 0.1s ease;
    transform: translateY(-2px);
}

body.dark-mode #redes a {
    transition: all 0.1s ease;
}

body.dark-mode #redes a:hover {
    border-radius: 50%;
    height: 47px;
    transition: all 0.1s ease;
    transform: translateY(-2px);
}

/* ── Lang Switcher ── */
.lang-switcher {
    position: relative;
    display: inline-block;
    align-content: center;
}

.lang-selected {
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--nav-text);
    transition: all 0.2s, background 0.2s;
}

.lang-selected:hover {
    background: var(--hover-bg);
    color: black;
}

body.dark-mode .lang-selected:hover {
    background: var(--hover-bg);
    color: #6b6b6b;
}

.lang-arrow {
    font-size: 0.65rem;
    display: inline-block;
    transition: transform 0.2s ease;
}

.lang-arrow.rotated {
    transform: rotate(180deg);
}

.lang-menu {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    list-style: none;
    margin: 0;
    padding: 4px 0;
    min-width: 130px;
    border: 1px solid var(--border-color);
    background: var(--bg-container);
    z-index: 999;
}

.lang-menu.open {
    display: block;
}

.lang-menu li {
    padding: 8px 12px;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-color);
    transition: background 0.15s;
}

.lang-menu li:hover {
    background: var(--hover-bg);
}

#header-column-2 {
    display: flex;
    gap: 45px;
    margin-right: 20px;
}

/* Botón de modo */
#btnModo {
    width: 44px;
    height: 44px;
    border: none;
    cursor: pointer;
    background: transparent;
    background-image: url("../images/oscuro.svg");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 50px;
    filter: invert(1);
    transition: transform .3s ease, filter 0.3s ease;
}

#btnModo:hover {
    transform: scale(1.15) rotate(15deg);
    filter: invert(1);
}

#btnModo:active {
    transform: scale(1.05) rotate(0deg);
}

body.dark-mode #btnModo {
    background-image: url("../images/claro.svg");
    filter: invert(1);
}

body.dark-mode #btnModo:hover {
    filter: invert(1) drop-shadow(0px 4px 15px rgba(84, 84, 233, 0.6));
    transform: scale(1.15) rotate(-15deg);
}

/* Cerrar sesión */
#cerrar-sesion {
    align-self: center;
}

#cerrar-sesion a {
    font-weight: 500;
    background-color: var(--cerrar-sesion-bg);
    transition: all 0.3s ease;
    display: inline-block;
    padding: 15px 57px;
    color: #ffffff;
    text-decoration: none;
    font-family: 'Plus Jakarta Sans', sans-serif;
}

body.dark-mode #cerrar-sesion a {
    background-color: var(--cerrar-sesion-bg);
}

#cerrar-sesion a:hover {
    background-color: var(--cerrar-sesion-hover-bg);
    font-size: 17px;
    transition: all 0.3s ease;
}

body.dark-mode #cerrar-sesion a:hover {
    background-color: var(--cerrar-sesion-hover);
    font-size: 17.5px;
    transition: all 0.3s ease;
}

/* ── Botón hamburguesa ──────────────────────────────────── */
#burgerBtn {
    opacity: 1;
    transition: opacity 0.1s ease;
}

#burgerBtn.open {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.burger-inside {
    opacity: 1;
    pointer-events: all;
}

.burger-btn {
    z-index: 200;
    width: 48px;
    height: 48px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 7px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 6px;
    align-items: flex-end;
    transform: rotate(0deg);
    transition: transform 0.3s ease;
}

.burger-btn:hover span:nth-child(2) {
    width: 100%;
}

.burger-btn.open:hover {
    transform: rotate(90deg);
    transition: transform 0.3s ease;
}

#home:hover {
    transform: translateY(-3px);
    transition: all 0.3s ease;
}

.burger-btn span {
    display: block;
    height: 2px;
    background: var(--nav-text);
    border-radius: 2px;
    transform-origin: center;
    transition: transform 0.4s cubic-bezier(.77, 0, .18, 1),
        opacity 0.3s ease,
        width 0.4s cubic-bezier(.77, 0, .18, 1);
}

.burger-btn span:nth-child(1) {
    width: 100%;
}

.burger-btn span:nth-child(2) {
    width: 70%;
}

.burger-btn span:nth-child(3) {
    width: 100%;
}

.burger-btn.open span:nth-child(1) {
    width: 100%;
    transform: translateY(9px) rotate(45deg);
}

.burger-btn.open span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.burger-btn.open span:nth-child(3) {
    width: 100%;
    transform: translateY(-9px) rotate(-45deg);
}

/* ── Overlay ────────────────────────────────────────────── */
.overlay {
    position: fixed;
    inset: 0;
    background: var(--overlay-bg);
    backdrop-filter: blur(3px);
    z-index: 90;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.overlay.open {
    opacity: 1;
    pointer-events: all;
}

/* ── Panel lateral ──────────────────────────────────────── */
.nav-panel {
    position: fixed;
    top: 0;
    right: 0;
    height: 100%;
    width: 300px;
    background: var(--nav-panel-bg);
    border: 0px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    padding: 8rem 1.5rem 2rem 1.5rem;
    transform: translateX(100%);
    transition: transform 0.5s cubic-bezier(.77, 0, .18, 1), background-color 0.3s ease;
    justify-content: space-between;
}

.nav-panel.open {
    transform: translateX(0);
}

.nav-divider {
    height: 1px;
    background: rgba(255 255 255 / 13%);
    margin: 2rem 0;
}

/* ── Links principales ──────────────────────────────────── */
#home {
    position: absolute;
    top: 25px;
    opacity: 0;
    transition: all 0.3s ease;
}

#cerrar {
    position: absolute;
    top: 31px;
    right: 32px;
    opacity: 0;
    transition: opacity 0.1s ease;
}

#cerrar.open,
#home.open {
    opacity: 1;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 2.2rem;
}

nav ul li {
    overflow: visible;
}

nav ul li>a {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--nav-text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    opacity: 0;
    transform: translateX(24px);
    padding: 0.4rem 0;
    transition: color 0.25s ease, opacity 0.5s ease, transform 0.5s cubic-bezier(.77, 0, .18, 1);
}

.nav-panel.open nav ul li>a {
    opacity: 1;
    transform: translateX(0);
}

nav ul li:nth-child(1)>a {
    transition-delay: 0.05s;
}

nav ul li:nth-child(2)>a {
    transition-delay: 0.12s;
}

nav ul li>a::before {
    content: '';
    display: block;
    width: 0;
    height: 2px;
    background: rgba(255, 255, 255, 0.7);
    transition: width 0.3s ease;
    flex-shrink: 0;
}

#home>a::before {
    display: none;
}

nav ul li>a:hover {
    color: #ffffff;
}

nav ul li>a:hover::before {
    width: 16px;
}

/* ── Flecha ─────────────────────────────────────────────── */
.arrow {
    font-size: 0.6rem;
    transition: transform 0.3s ease;
    margin-left: auto;
    padding-left: 0.5rem;
    flex-shrink: 0;
    opacity: 0.7;
}

nav ul li.has-submenu.open>a .arrow {
    transform: rotate(180deg);
}

/* ── Submenú ────────────────────────────────────────────── */
.submenu {
    list-style: none;
    padding: 0 0 0 1rem;
    margin: 0 0 0 0.4rem;
    max-height: 0;
    overflow: hidden;
    border-left: 2px solid rgba(255, 255, 255, 0.2);
    transition: max-height 0.35s cubic-bezier(.77, 0, .18, 1);
}

.submenu.open {
    max-height: 200px;
    margin-bottom: 0.4rem;
}

.submenu li a {
    font-family: 'Plus Jakarta Sans', sans-serif !important;
    font-size: 0.95rem !important;
    font-weight: 400 !important;
    letter-spacing: 0.02em !important;
    color: rgba(240, 236, 224, 0.6) !important;
    text-decoration: none;
    display: flex !important;
    align-items: center;
    padding: 0.3rem 0 !important;
    opacity: 0 !important;
    transform: translateX(12px) !important;
    transition: color 0.2s ease, opacity 0.3s ease, transform 0.3s ease !important;
}

.submenu.open li a {
    opacity: 1 !important;
    transform: translateX(0) !important;
}

.submenu li:nth-child(1) a {
    transition-delay: 0.06s !important;
}

.submenu li:nth-child(2) a {
    transition-delay: 0.12s !important;
}

.submenu li a::before {
    display: none !important;
}

.submenu li a:hover {
    color: #ffffff !important;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
    #redes {
        display: none;
    }
}

@media (max-width: 570px) {
    #header img {
        width: 32vw;
    }

    #header-btn-img {
        display: flex;
        align-items: center;
        gap: 2vw;
    }
}

@media (max-width: 420px) {
    #header {
        padding: 1rem 1rem;
    }
}