.site-header {
    padding: 0 var(--container-padding);
    position: relative;
    z-index: 100;
    background: var(--color-background);
    border-bottom: 1px solid var(--color-border);
}

.header-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0;
}

.header-main {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

/* ─── Logo ─── */

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

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
}

.site-logo img {
    display: block;
}

.site-logo-text {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--color-text-primary);
    letter-spacing: var(--tracking-tight);
}

/* ─── Desktop Navigation ─── */

.header-nav {
    display: flex;
    align-items: center;
}

.header-nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
    margin: 0;
    padding: 0;
}

.header-nav-item {
    margin: 0;
}

.header-nav-link {
    display: block;
    padding: var(--space-2) var(--space-3);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-muted);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.header-nav-link:hover {
    color: var(--color-text-primary);
    background-color: var(--color-grey-50);
}

.header-nav-link.is-active {
    color: var(--color-text-primary);
    font-weight: var(--font-semibold);
}

/* ─── Header Right ─── */

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

.header-search-btn,
.header-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    border: none;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.header-search-btn:hover,
.header-menu-btn:hover {
    color: var(--color-text-primary);
    background-color: var(--color-grey-50);
}

.header-menu-btn {
    display: none;
}

/* ═══════════════════════════════════════
   Mobile Navigation Drawer
   ═══════════════════════════════════════ */

.nav-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(9, 9, 11, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.nav-overlay.is-active {
    opacity: 1;
    visibility: visible;
}

.nav-drawer {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 201;
    width: 320px;
    max-width: 85vw;
    background: var(--color-background);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.nav-drawer.is-active {
    transform: translateX(0);
}

.nav-drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-5);
    border-bottom: 1px solid var(--color-border);
}

.nav-drawer-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    border: none;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-drawer-close:hover {
    color: var(--color-text-primary);
    background-color: var(--color-grey-50);
}

.nav-drawer-menu {
    list-style: none;
    margin: 0;
    padding: var(--space-3) var(--space-3);
}

.nav-drawer-item {
    margin: 0;
}

.nav-drawer-link {
    display: block;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-drawer-link:hover {
    color: var(--color-text-primary);
    background-color: var(--color-grey-50);
}

/* ─── Body Lock ─── */

body.nav-open {
    overflow: hidden;
}

/* ═══════════════════════════════════════
   Responsive
   ═══════════════════════════════════════ */

@media (max-width: 767px) {
    .site-header {
        padding: 0 var(--space-4);
    }

    .header-nav {
        display: none;
    }

    .header-menu-btn {
        display: flex;
    }
}

@media (min-width: 768px) {
    .header-menu-btn {
        display: none;
    }

    .nav-overlay,
    .nav-drawer {
        display: none;
    }
}