/* 
 * Header "Trifásico" Styles 
 */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 999;
    padding: 20px 0;
    transition: all 0.4s ease;
    background-color: transparent;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.site-header.is-sticky {
    background-color: rgba(17, 17, 16, 0.95); /* var(--color-bg) but rgba for backdrop */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 15px 0;
    border-bottom-color: rgba(212, 175, 55, 0.2); /* Gold border */
}

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

/* Phase 1: Logo */
.header-logo {
    flex: 0 0 20%;
    display: flex;
    align-items: center;
}

.header-logo .custom-logo {
    max-height: 50px;
    width: auto;
    object-fit: contain;
}

.site-title {
    font-size: 24px;
    margin: 0;
    line-height: 1;
    display: flex;
    align-items: center;
}

.logo-text-pdi {
    color: var(--color-accent);
    font-weight: 700;
    font-style: italic;
    font-size: 32px;
    margin-right: 10px;
    position: relative;
}

.logo-text-pdi::after {
    content: '';
    position: absolute;
    right: -10px;
    top: 5px;
    height: calc(100% - 10px);
    width: 2px;
    background-color: rgba(255,255,255,0.2);
}

.logo-text-sub {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-text);
    font-family: var(--font-secondary);
    max-width: 100px;
    line-height: 1.2;
    padding-left: 10px;
}

/* Phase 2: Navigation */
.header-nav {
    flex: 1 1 auto;
    display: flex;
    justify-content: center;
}

.main-navigation {
    display: block;
}

.nav-menu-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 10px 0;
    position: relative;
    transition: color var(--transition-speed) ease;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-speed) ease;
}

.nav-link:hover,
.nav-item.current-menu-item .nav-link {
    color: var(--color-accent);
}

.nav-link:hover::before,
.nav-item.current-menu-item .nav-link::before {
    width: 100%;
}

/* Phase 3: CTA Action */
.header-action {
    flex: 0 0 20%;
    display: flex;
    justify-content: flex-end;
}

/* Mobile Menu Toggle (Hamburger) */
.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.hamburger-box {
    width: 30px;
    height: 24px;
    display: inline-block;
    position: relative;
}

.hamburger-inner {
    display: block;
    top: 50%;
    margin-top: -2px;
}

.hamburger-inner, .hamburger-inner::before, .hamburger-inner::after {
    width: 30px;
    height: 2px;
    background-color: var(--color-text);
    position: absolute;
    transition: transform 0.15s ease, background-color 0.15s ease;
}

.hamburger-inner::before, .hamburger-inner::after {
    content: "";
    display: block;
}

.hamburger-inner::before { top: -8px; }
.hamburger-inner::after { bottom: -8px; }

/* Hamburger Active State */
.menu-toggle.is-active .hamburger-inner {
    transform: rotate(45deg);
}
.menu-toggle.is-active .hamburger-inner::before {
    top: 0;
    opacity: 0;
}
.menu-toggle.is-active .hamburger-inner::after {
    bottom: 0;
    transform: rotate(-90deg);
}

/* Responsive */
@media screen and (max-width: 1024px) {
    .nav-menu-list {
        gap: 20px;
    }
    .header-logo, .header-action {
        flex: 0 0 auto;
    }
    .header-nav {
        flex: 1 1 auto;
    }
}

@media screen and (max-width: 768px) {
    .header-action {
        display: none; /* Hide CTA on mobile to save space, or move to menu */
    }
    
    .menu-toggle {
        display: block;
        z-index: 1001;
    }
    
    .nav-menu-list {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 400px;
        height: 100vh;
        background-color: var(--color-bg-secondary);
        flex-direction: column;
        justify-content: center;
        padding: 40px;
        transition: right 0.4s cubic-bezier(0.77, 0, 0.175, 1);
        z-index: 1000;
        border-left: 1px solid rgba(212, 175, 55, 0.2);
    }
    
    .main-navigation.is-open .nav-menu-list {
        right: 0;
    }
    
    .nav-item {
        width: 100%;
        text-align: center;
    }
    
    .nav-link {
        font-size: 18px;
        display: block;
        padding: 15px 0;
    }
    
    /* Overlay */
    .mobile-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0,0,0,0.7);
        z-index: 999;
        opacity: 0;
        visibility: hidden;
        transition: all 0.4s ease;
        backdrop-filter: blur(5px);
    }
    
    .mobile-overlay.is-active {
        opacity: 1;
        visibility: visible;
    }
}