/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all var(--transition);
}

.header--scrolled {
    box-shadow: var(--shadow-md);
}

/* Top Bar */
.topbar {
    background: var(--color-dark);
    padding: 0.4rem 0;
    font-size: var(--font-size-xs);
    color: rgba(255,255,255,0.8);
    display: none;
    transition: all var(--transition);
}

.header--scrolled .topbar {
    display: none !important;
}

.topbar__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.topbar__info {
    display: flex;
    gap: var(--space-lg);
}

.topbar__item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.topbar__social {
    display: flex;
    gap: var(--space-md);
}

.topbar__social a {
    color: rgba(255,255,255,0.8);
    transition: color var(--transition-fast);
}

.topbar__social a:hover {
    color: var(--color-primary);
}

/* Main Nav Bar */
.header__main {
    padding: 0.75rem 0;
    transition: all var(--transition);
}

.header--scrolled .header__main {
    background: white;
    padding: 0.5rem 0;
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header__logo img {
    height: 50px;
    width: auto;
    transition: var(--transition);
}

/* Logo blanco: visible por defecto sobre hero oscuro */
.header__logo .logo-white {
    display: block;
}

.header__logo .logo-dark {
    display: none;
}

/* Cuando el header hace scroll (fondo blanco), oscurecer el logo */
.header--scrolled .header__logo .logo-white {
    display: none;
}

.header--scrolled .header__logo .logo-dark {
    display: block;
    filter: brightness(0.3);
}

/* Navigation */
.nav {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    width: 300px;
    height: 100vh;
    background: white;
    box-shadow: -5px 0 30px rgba(0,0,0,0.15);
    padding: 5rem 2rem 2rem;
    z-index: 999;
    transform: translateX(100%);
    transition: transform var(--transition);
    overflow-y: auto;
}

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

.nav__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.nav__link {
    display: block;
    padding: 0.75rem 0;
    font-weight: 500;
    color: var(--color-dark);
    font-size: var(--font-size-lg);
    border-bottom: 1px solid var(--color-border);
    transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
    color: var(--color-primary);
}

.nav__cta {
    margin-top: var(--space-xl);
}

/* Hamburger */
.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 28px;
    cursor: pointer;
    z-index: 1001;
    position: relative;
}

.hamburger__line {
    width: 100%;
    height: 3px;
    background: white;
    border-radius: 2px;
    transition: all var(--transition);
}

.header--scrolled .hamburger__line {
    background: var(--color-dark);
}

.hamburger--active .hamburger__line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
    background: var(--color-dark);
}

.hamburger--active .hamburger__line:nth-child(2) {
    opacity: 0;
}

.hamburger--active .hamburger__line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
    background: var(--color-dark);
}

/* Overlay */
.nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 998;
}

.nav-overlay--visible {
    display: block;
}

/* Body lock */
body.nav-open {
    overflow: hidden;
}

/* Desktop Nav */
@media (min-width: 768px) {
    .topbar {
        display: block;
    }
}

@media (min-width: 992px) {
    .hamburger {
        display: none;
    }

    .nav-overlay {
        display: none !important;
    }

    .nav {
        display: flex;
        position: static;
        width: auto;
        height: auto;
        background: transparent;
        box-shadow: none;
        padding: 0;
        transform: none;
        overflow: visible;
    }

    .nav__list {
        flex-direction: row;
        align-items: center;
        gap: 0;
    }

    .nav__link {
        padding: 0.5rem 1rem;
        font-size: var(--font-size-sm);
        font-weight: 500;
        color: white;
        border-bottom: none;
    }

    .header--scrolled .nav__link {
        color: var(--color-dark);
    }

    .nav__link:hover,
    .nav__link--active {
        color: var(--color-primary);
    }

    .nav__cta {
        margin-top: 0;
        margin-left: var(--space-md);
    }
}