.header {
    position: sticky;
    top: 1rem;
    z-index: var(--z-sticky);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    margin: 1rem 1.25rem 0 1.25rem;
    background: var(--surface-primary);
    border: 0.125rem solid var(--border-medium);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    height: 4rem;
    transition: var(--transition-normal);
    backdrop-filter: blur(0.625rem) saturate(180%);
}

body.dark .header {
    background: rgba(19, 27, 46, 0.9);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-xl), var(--glow-primary);
}

.hd-p-logo {
    margin: 0;
    font-family: var(--font-display);
    font-size: 1.375rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 50%;
    transition: var(--transition-fast);
    letter-spacing: -0.03125rem;
    position: relative;
}

body.dark .hd-p-logo {
    color: var(--color-secondary);
    text-shadow: var(--glow-secondary);
}

.hd-p-logo::after {
    content: '';
    position: absolute;
    bottom: -0.25rem;
    left: 0;
    width: 0;
    height: 0.1875rem;
    background: var(--color-secondary);
    border-radius: var(--radius-full);
    transition: var(--transition-normal);
}

.hd-p-logo:hover::after {
    width: 100%;
}

.hd-bn-modos,
.hd-bn-hamburguesa {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    border: 0.125rem solid var(--border-medium);
    border-radius: var(--radius-full);
    background: var(--surface-secondary);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-normal);
    font-size: 1.375rem;
    padding: 0;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

body.dark .hd-bn-modos,
body.dark .hd-bn-hamburguesa {
    background: var(--surface-hover);
    border-color: var(--border-strong);
}

.hd-bn-modos:hover,
.hd-bn-hamburguesa:hover {
    background: var(--color-primary);
    color: var(--text-inverse);
    border-color: var(--color-primary);
    transform: scale(1.08);
    box-shadow: var(--shadow-lg);
}

body.dark .hd-bn-modos:hover,
body.dark .hd-bn-hamburguesa:hover {
    box-shadow: var(--shadow-lg), var(--glow-primary);
}

.hd-bn-modos:active,
.hd-bn-hamburguesa:active {
    transform: scale(0.96);
}

.hd-bn-modos-sun,
.hd-bn-modos-moon {
    transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.hd-bn-modos-sun {
    display: block;
}

.hd-bn-modos-moon {
    display: none;
}

body.dark .hd-bn-modos-sun {
    display: none;
}

body.dark .hd-bn-modos-moon {
    display: block;
}

.hd-bn-modos:hover .hd-bn-modos-sun {
    transform: rotate(180deg);
}

.hd-bn-modos:hover .hd-bn-modos-moon {
    transform: rotate(-30deg);
}

.hd-bn-hamburguesa .bi-list {
    display: block;
    transition: var(--transition-fast);
}

.hd-bn-hamburguesa .bi-x-lg {
    display: none;
    transition: var(--transition-fast);
}

.hd-bn-hamburguesa.activo .bi-list {
    display: none;
}

.hd-bn-hamburguesa.activo .bi-x-lg {
    display: block;
}

.hd-nav {
    position: fixed;
    top: 6.5rem;
    left: 1.25rem;
    right: 1.25rem;
    background: var(--surface-primary);
    backdrop-filter: blur(0.625rem);
    border: 0.125rem solid var(--border-medium);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1), 
                opacity 0.4s ease,
                transform 0.4s ease;
    opacity: 0;
    transform: translateY(-1.25rem);
}

body.dark .hd-nav {
    background: rgba(19, 27, 46, 0.95);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-xl), var(--glow-primary);
}

.hd-nav.nav-abierto {
    max-height: calc(100vh - 8rem);
    opacity: 1;
    overflow-y: auto;
    transform: translateY(0);
}

.hd-nav-ul {
    list-style: none;
    margin: 0;
    padding: 1.5rem;
}

.hd-nav-ul-li {
    position: relative;
}

.hd-nav-ul-li-a {
    position: relative;
    display: flex;
    align-items: center;
    padding: 1rem 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
}

.hd-nav-ul-li-a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 0.25rem;
    height: 0;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    transition: var(--transition-normal);
}

.hd-nav-ul-li-a:hover {
    background: var(--surface-hover);
    color: var(--color-primary);
    padding-left: 1.75rem;
}

.hd-nav-ul-li-a:hover::before {
    height: 60%;
}

body.dark .hd-nav-ul-li-a:hover {
    background: var(--surface-secondary);
}

.submenu {
    list-style: none;
    margin: 0;
    padding: 0 0 0 1.25rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.submenu.submenu-abierto {
    max-height: 37.5rem;
    padding: 0.75rem 0 0.75rem 1.25rem;
}

.submenu a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
    border-radius: var(--radius-md);
    margin-bottom: 0.375rem;
}

.submenu a::before {
    content: '→';
    color: var(--color-accent);
    font-weight: var(--font-weight-bold);
    transition: var(--transition-fast);
}

.submenu a:hover {
    background: var(--surface-hover);
    color: var(--color-primary);
    padding-left: 1.5rem;
}

.submenu a:hover::before {
    transform: translateX(0.25rem);
}

@media (min-width: 48rem) {
    .header {
        padding: 1.25rem 2rem;
        margin: 1.5rem 2rem 0 2rem;
    }

    .hd-p-logo {
        font-size: 1.625rem;
        max-width: 60%;
    }

    .hd-bn-hamburguesa {
        display: none;
    }

    .hd-nav {
        position: static;
        max-height: none;
        opacity: 1;
        overflow: visible;
        background: transparent;
        border: none;
        box-shadow: none;
        backdrop-filter: none;
        transform: translateY(0);
        margin: 0;
    }

    .hd-nav-ul {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        padding: 0;
    }

    .hd-nav-ul-li-a {
        padding: 0.75rem 1.25rem;
        margin-bottom: 0;
    }

    .hd-nav-ul-li-a::before {
        display: none;
    }

    .hd-nav-ul-li-a:hover {
        padding-left: 1.25rem;
    }

    .submenu {
        position: absolute;
        top: calc(100%);
        left: 0;
        min-width: 16rem;
        background: var(--surface-primary);
        border: 0.125rem solid var(--border-medium);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-xl);
        max-height: 0;
        padding: 0;
        overflow: hidden;
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        opacity: 0;
        transform: translateY(-0.625rem);
    }

    body.dark .submenu {
        background: var(--surface-secondary);
        border-color: var(--border-strong);
        box-shadow: var(--shadow-xl), var(--glow-primary);
    }

    .hd-nav-ul-li:hover .submenu {
        max-height: 37.5rem;
        padding: 0.75rem;
        opacity: 1;
        transform: translateY(0);
    }

    .submenu a {
        margin-bottom: 0.25rem;
    }

    .submenu a:last-child {
        margin-bottom: 0;
    }

    .submenu a:hover {
        background: var(--color-primary);
        color: var(--text-inverse);
        padding-left: 1rem;
    }

    body.dark .submenu a:hover {
        box-shadow: var(--glow-primary);
    }
}

@media (min-width: 64rem) {
    .header {
        padding: 1.5rem 3rem;
        margin: 2rem 3rem 0 3rem;
    }

    .hd-p-logo {
        font-size: 1.875rem;
        max-width: none;
    }

    .hd-bn-modos {
        width: 3.25rem;
        height: 3.25rem;
        font-size: 1.5rem;
    }

    .hd-nav-ul {
        gap: 0.75rem;
    }

    .hd-nav-ul-li-a {
        padding: 0.875rem 1.5rem;
        font-size: var(--font-size-lg);
    }

    .hd-nav-ul-li-a:hover {
        padding-left: 1.5rem;
    }

    .submenu {
        min-width: 18rem;
    }
}
@media (min-width: 90rem) {
    .header {
        padding: 1.75rem 5rem;
        margin: 2.5rem 5rem 0 5rem;
        max-width: 120rem;
        margin-left: auto;
        margin-right: auto;
    }

    .hd-p-logo {
        font-size: 2.125rem;
    }

    .hd-nav-ul {
        gap: 1rem;
    }

    .hd-nav-ul-li-a {
        padding: 1rem 1.75rem;
    }

    .hd-nav-ul-li-a:hover {
        padding-left: 1.75rem;
    }
}