/* =========================================
   HEADER.CSS - Navegación Superior
   IRIS
   ========================================= */

/* ─── Header Principal ─── */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 5%;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    /* Transición suave para scroll-hide y efectos visuales */
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1),
                background 0.25s ease,
                box-shadow 0.25s ease,
                border-color 0.25s ease;
}

/* Estado: header visible con fondo al hacer scroll */
.main-header.scrolled {
    background: rgba(248, 250, 252, 0.94);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-xs);
}

/* Estado: header oculto (scroll hacia abajo) */
.main-header.header-hidden {
    transform: translateY(-100%);
}

/* El menú móvil también se esconde cuando el header lo hace */
.mobile-menu {
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1),
                opacity 0.25s ease;
}

/* ─── Nav Desktop ─── */
.desktop-nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.desktop-nav a {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-body);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    text-decoration: none;
}

.desktop-nav a:hover {
    color: var(--text-dark);
    background: var(--bg-surface);
}

/* ─── Auth Buttons ─── */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.btn-nav-login {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-body);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    text-decoration: none;
}

.btn-nav-login:hover {
    color: var(--text-dark);
    background: var(--bg-surface);
}

.btn-nav-register {
    font-size: var(--text-sm);
    font-weight: 600;
    background: var(--primary);
    color: #fff;
    padding: 9px 18px;
    border-radius: var(--radius-md);
    transition: var(--transition-slow);
    text-decoration: none;
    border: none;
}

.btn-nav-register:hover {
    background: var(--primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(61, 155, 122, 0.3);
}

/* ─── Hamburger (mobile) ─── */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    cursor: pointer;
    border: none;
    background: none;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.hamburger:hover { background: var(--bg-surface); }

.hamburger span {
    display: block;
    height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── Mobile Menu ─── */
.mobile-menu {
    display: none;
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--bg-main);
    border-bottom: 1px solid var(--border);
    padding: var(--space-6) 5%;
    z-index: 999;
    box-shadow: var(--shadow-md);
    animation: fadeIn 0.2s ease;
}

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

.mobile-menu nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.mobile-menu nav a {
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--text-body);
    padding: 12px 0;
    border-bottom: 1px solid var(--border-dark);
    text-decoration: none;
}

.mobile-menu .mobile-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.mobile-actions .btn-primary,
.mobile-actions .btn-outline {
    width: 100%;
    justify-content: center;
}

/* ─── Header Simple (páginas internas) ─── */
.simple-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) 5%;
    background: var(--bg-surface-2);
    border-bottom: 1px solid var(--border);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.back-link:hover { color: var(--text-dark); }

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .desktop-nav,
    .header-actions .btn-nav-login,
    .header-actions .btn-nav-register { display: none; }
    .hamburger { display: flex; }
}