/*
 * PivHub CSS Module: 01-header.css
 * Header and primary/mobile navigation.
 */

/* --------------------------------------------------------------------------
   4. Header & Navigation
   -------------------------------------------------------------------------- */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
    padding-block: var(--space-3);
}

.site-header.is-scrolled {
    background: rgba(var(--theme-bg-rgb), 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 var(--color-on-dark-line), 0 4px 24px rgba(0, 0, 0, 0.3);
    padding-block: var(--space-2);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-pad);
    gap: var(--space-4);
}

.header-left {
    flex-shrink: 0;
}

.logo {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
}

.logo-image {
    display: block;
    width: auto;
    height: 36px;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 0.02em;
    line-height: 1;
}

.logo-accent {
    color: var(--color-on-dark-strong);
    font-style: italic;
}

.primary-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.primary-nav .nav-list,
.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.primary-nav .nav-list li,
.nav-list li {
    position: relative;
}

.primary-nav .nav-list a,
.nav-list a {
    display: inline-block;
    font-family: var(--font-body);
    font-size: var(--fs-caption);
    font-weight: 500;
    color: var(--color-on-dark-medium);
    padding-block: 4px;
    position: relative;
    transition: color var(--transition);
}

.primary-nav .nav-list a::after,
.nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--color-on-dark-strong);
    transition: width var(--transition);
}

.primary-nav .nav-list a:hover,
.nav-list a:hover {
    color: var(--color-on-dark-strong);
}

.primary-nav .nav-list a:hover::after,
.nav-list a:hover::after {
    width: 100%;
}

.primary-nav .current-menu-item > a,
.primary-nav .current_page_item > a {
    color: var(--color-on-dark-strong);
}

.primary-nav .current-menu-item > a::after,
.primary-nav .current_page_item > a::after {
    width: 100%;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-shrink: 0;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-white);
    border-radius: 2px;
    transition: all var(--transition);
    transform-origin: center;
}

.menu-toggle.is-active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.is-active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.menu-toggle.is-active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    background: var(--color-black);
    z-index: 999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--space-15) var(--space-6);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    overflow-y: auto;
    border-left: 1px solid var(--color-on-dark-line);
}

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

.mobile-nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.mobile-nav-list a {
    display: block;
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 600;
    color: var(--color-white);
    padding: var(--space-1) 0;
    transition: color var(--transition), padding-left var(--transition);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.mobile-nav-list a:hover {
    color: var(--color-on-dark-strong);
    padding-left: var(--space-2);
}

.mobile-nav-list .mobile-cta {
    margin-top: var(--space-4);
    align-self: flex-start;
    font-family: var(--font-body);
    font-size: var(--fs-caption);
    text-transform: uppercase;
    border-bottom: none;
}