/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    height: var(--header-height);
    display: flex;
    align-items: center;
    transition: background var(--transition-slow), box-shadow var(--transition-slow);
}

/* Solid background on scroll */
.site-header.is-scrolled {
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(14px);
}

/* When header sits on dark video, tweak CTA outline */
.site-header .btn-outline-white {
    padding: calc(var(--space-2) + 3px) var(--space-5);
    font-size: var(--text-xs);
}

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

/* Logo */
.site-branding {
    flex-shrink: 0;
}

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

.site-logo-light,
.site-logo-dark {
    height: 24px;
    width: auto;
    display: block;
}

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

.site-header.is-scrolled .site-logo-light {
    display: none;
}

.site-header.is-scrolled .site-logo-dark {
    display: block;
}

.site-logo svg {
    height: 24px;
    width: auto;
    fill: var(--color-white);
}

.site-title {
    font-family: var(--font-heading);
    font-size: var(--text-base);
    font-weight: var(--font-bold);
    color: var(--color-white);
    text-decoration: none;
    letter-spacing: var(--tracking-tight);
}

.site-title:hover {
    color: var(--color-white);
}

/* Centered navigation */
.main-nav {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: calc(var(--space-8) + 20px);
}

.nav-menu li a {
    color: rgba(255, 255, 255, 0.8);
    font-family: var(--font-body);
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
    letter-spacing: var(--tracking-wide);
    transition: color var(--transition-base);
    text-decoration: none;
}

.nav-menu li a:hover,
.nav-menu li.current-menu-item a {
    color: var(--color-white);
}

.site-header.is-scrolled .nav-menu li a {
    color: rgba(0, 0, 0, 0.74);
}

.site-header.is-scrolled .nav-menu li a:hover,
.site-header.is-scrolled .nav-menu li.current-menu-item a {
    color: var(--color-black);
}

/* Right-side CTA */
.header-cta {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.header-cta .btn {
    white-space: nowrap;
}

.site-header.is-scrolled .header-cta .btn-outline-white {
    background: var(--color-accent);
    color: var(--color-white);
    border-color: var(--color-accent);
}

.site-header.is-scrolled .header-cta .btn-outline-white:hover {
    background: var(--color-accent-dark);
    color: var(--color-white);
    border-color: var(--color-accent-dark);
}

/* Mobile toggle */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-white);
    position: relative;
    transition: background var(--transition-base);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: var(--color-white);
    left: 0;
    transition: transform var(--transition-base);
}

.site-header.is-scrolled .hamburger,
.site-header.is-scrolled .hamburger::before,
.site-header.is-scrolled .hamburger::after {
    background: var(--color-black);
}

.hamburger::before { top: -7px; }
.hamburger::after  { top: 7px; }

/* Hamburger → X animation */
.mobile-menu-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* Mobile menu overlay */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.95);
    z-index: 999;
    padding: calc(var(--header-height) + var(--space-8)) var(--space-8) var(--space-8);
}

.mobile-menu-overlay.is-open {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.mobile-nav {
    text-align: center;
}

.mobile-nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.mobile-nav-menu li a {
    font-family: var(--font-heading);
    font-size: var(--text-3xl);
    color: var(--color-white);
    font-weight: var(--font-bold);
    text-decoration: none;
    transition: color var(--transition-base);
}

.mobile-nav-menu li a:hover {
    color: var(--color-primary-light);
}

.mobile-nav-cta {
    margin-top: var(--space-4);
}

/* Header offset for main content (not on front page — landing is full-screen) */
.site-main {
    padding-top: var(--header-height);
}

.home .site-main {
    padding-top: 0;
}

@media (max-width: 768px) {
    .main-nav,
    .header-cta {
        display: none;
    }

    .site-logo-light,
    .site-logo-dark {
        height: 16px;
    }

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