/* ==========================================================
   SITE HEADER
   Sticky · Transparent over hero · Solid on scroll
   Desktop nav · Accessible mobile drawer
   ========================================================== */

.site-header {
    --header-bg: transparent;
    --header-fg: var(--color-heading);
    --header-fg-muted: var(--color-text-light);
    --header-border: transparent;
    --header-shadow: none;
    --header-logo-bg: var(--color-primary);
    --header-logo-stroke: var(--color-inverse);

    position: sticky;
    top: 0;
    z-index: var(--z-header);
    width: 100%;
}

/*
 * Transparent-over-hero pages: fixed overlay so the hero is edge-to-edge.
 * Remains fixed while scrolled to avoid layout jump (sticky ↔ fixed).
 */
.has-transparent-header .site-header {
    position: fixed;
    left: 0;
    right: 0;
}

.site-header__bar {
    position: relative;
    z-index: calc(var(--z-header) + 2);
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--header-border);
    box-shadow: var(--header-shadow);
    transition:
        background-color var(--transition),
        border-color var(--transition),
        box-shadow var(--transition);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    min-height: var(--header-height);
}

/* ---------- Brand ---------- */

.site-header__brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
    color: var(--header-fg);
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.site-header__brand:hover {
    color: var(--header-fg);
    opacity: 0.88;
}

.site-header__logo {
    display: flex;
}

.site-header__logo-mark,
.logo-mark__bg {
    display: block;
}

.logo-mark__bg {
    fill: var(--header-logo-bg);
    transition: fill var(--transition);
}

.logo-mark__wave {
    stroke: var(--header-logo-stroke);
    transition: stroke var(--transition);
}

.site-header__brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.site-header__brand-name {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: var(--font-weight-extrabold);
    letter-spacing: var(--letter-spacing-tight);
    color: var(--header-fg);
    transition: color var(--transition);
}

.site-header__brand-tag {
    font-family: var(--font-heading);
    font-size: 0.6875rem;
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-wider);
    text-transform: uppercase;
    color: var(--header-fg-muted);
    transition: color var(--transition);
}

/* ---------- Desktop Nav ---------- */

.site-header__nav {
    display: none;
    flex: 1 1 auto;
    justify-content: center;
}

.site-header__list {
    display: flex;
    align-items: center;
    gap: 0.15rem;
}

.site-header__link {
    display: inline-flex;
    align-items: center;
    min-height: 2.75rem;
    padding: 0.5rem 0.85rem;
    font-family: var(--font-heading);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--header-fg-muted);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition:
        color var(--transition-fast),
        background-color var(--transition-fast);
}

.site-header__link:hover {
    color: var(--header-fg);
    background-color: rgba(22, 61, 99, 0.06);
}

.site-header__link.is-active,
.site-header__link[aria-current="page"] {
    color: var(--header-fg);
}

.site-header__link:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

/* ---------- Actions ---------- */

.site-header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-shrink: 0;
    margin-left: auto;
}

.site-header__cta {
    display: none;
}

/* ---------- Hamburger ---------- */

.site-header__toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    margin-right: -0.4rem;
    border-radius: var(--radius-sm);
    color: var(--header-fg);
    background: transparent;
    transition: background-color var(--transition-fast);
}

.site-header__toggle:hover {
    background-color: rgba(22, 61, 99, 0.08);
}

.site-header__toggle:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

.site-header__toggle-box {
    position: relative;
    display: block;
    width: 1.35rem;
    height: 0.9rem;
}

.site-header__toggle-line {
    position: absolute;
    left: 0;
    display: block;
    width: 100%;
    height: 2px;
    border-radius: 2px;
    background-color: currentColor;
    transition:
        transform var(--transition),
        opacity var(--transition-fast),
        top var(--transition);
}

.site-header__toggle-line:nth-child(1) { top: 0; }
.site-header__toggle-line:nth-child(2) { top: calc(50% - 1px); }
.site-header__toggle-line:nth-child(3) { top: calc(100% - 2px); }

/* Open → X */
.site-header.is-open .site-header__toggle-line:nth-child(1) {
    top: calc(50% - 1px);
    transform: rotate(45deg);
}

.site-header.is-open .site-header__toggle-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.site-header.is-open .site-header__toggle-line:nth-child(3) {
    top: calc(50% - 1px);
    transform: rotate(-45deg);
}

/* ---------- Transparent (over hero) ---------- */

.site-header--transparent:not(.is-scrolled):not(.is-open) {
    --header-bg: transparent;
    --header-fg: var(--color-inverse);
    --header-fg-muted: rgba(255, 255, 255, 0.82);
    --header-border: transparent;
    --header-shadow: none;
    --header-logo-bg: rgba(255, 255, 255, 0.16);
    --header-logo-stroke: var(--color-inverse);
}

.site-header--transparent:not(.is-scrolled):not(.is-open) .site-header__link:hover {
    background-color: rgba(255, 255, 255, 0.12);
    color: var(--color-inverse);
}

.site-header--transparent:not(.is-scrolled):not(.is-open) .site-header__toggle:hover {
    background-color: rgba(255, 255, 255, 0.12);
}

.site-header--transparent:not(.is-scrolled):not(.is-open) .site-header__cta.btn--accent {
    box-shadow: 0 8px 24px rgba(15, 46, 77, 0.25);
}

/* ---------- Scrolled / Solid ---------- */

.site-header.is-scrolled,
.site-header.is-open,
.site-header:not(.site-header--transparent) {
    --header-bg: rgba(255, 255, 255, 0.97);
    --header-fg: var(--color-heading);
    --header-fg-muted: var(--color-text-light);
    --header-border: var(--color-border);
    --header-shadow: var(--shadow-sm);
    --header-logo-bg: var(--color-primary);
    --header-logo-stroke: var(--color-inverse);
}

@supports (backdrop-filter: blur(12px)) {
    .site-header.is-scrolled .site-header__bar,
    .site-header.is-open .site-header__bar,
    .site-header:not(.site-header--transparent) .site-header__bar {
        background-color: rgba(255, 255, 255, 0.86);
        backdrop-filter: blur(14px) saturate(1.2);
        -webkit-backdrop-filter: blur(14px) saturate(1.2);
    }
}

/* ---------- Backdrop ---------- */

.site-header__backdrop {
    position: fixed;
    inset: 0;
    z-index: calc(var(--z-header) + 1);
    background-color: rgba(15, 46, 77, 0.48);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition:
        opacity var(--transition),
        visibility var(--transition);
}

.site-header.is-open .site-header__backdrop {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.site-header__backdrop[hidden] {
    display: block;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* ---------- Mobile Panel ---------- */

.site-header__panel {
    position: fixed;
    top: var(--header-height);
    right: 0;
    bottom: 0;
    z-index: calc(var(--z-menu));
    display: flex;
    flex-direction: column;
    width: min(100%, 22rem);
    padding: var(--space-5) var(--space-5) var(--space-7);
    background-color: var(--color-white);
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateX(105%);
    visibility: hidden;
    transition:
        transform var(--transition),
        visibility var(--transition);
}

.site-header.is-open .site-header__panel {
    transform: translateX(0);
    visibility: visible;
}

.site-header__panel[hidden] {
    display: flex;
    visibility: hidden;
}

.site-header__panel-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.site-header__panel-link {
    display: flex;
    align-items: center;
    min-height: 3rem;
    padding: 0.65rem 0.85rem;
    font-family: var(--font-heading);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-heading);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.site-header__panel-link:hover {
    background-color: var(--color-light);
    color: var(--color-primary);
}

.site-header__panel-link.is-active,
.site-header__panel-link[aria-current="page"] {
    background-color: var(--color-accent-soft);
    color: var(--color-primary);
}

.site-header__panel-link:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

.site-header__panel-footer {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin-top: auto;
    padding-top: var(--space-7);
}

.site-header__panel-phone {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    min-height: 2.75rem;
    font-family: var(--font-heading);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-light);
    text-decoration: none;
}

.site-header__panel-phone:hover {
    color: var(--color-accent);
}

/* Lock page scroll while menu open */
body.has-nav-open {
    overflow: hidden;
}

/* ---------- Desktop breakpoint ---------- */

@media (min-width: 1024px) {
    .site-header__nav {
        display: flex;
    }

    .site-header__cta {
        display: inline-flex;
    }

    .site-header__toggle {
        display: none;
    }

    .site-header__backdrop,
    .site-header__panel {
        display: none !important;
    }

    .site-header__list {
        gap: 0.25rem;
    }

    .site-header__link {
        padding-inline: 0.95rem;
    }
}

/* Slightly denser mid-size desktop before full CTA room */
@media (min-width: 1024px) and (max-width: 1199.98px) {
    .site-header__link {
        padding-inline: 0.65rem;
        font-size: 0.8125rem;
    }

    .site-header__cta {
        padding-inline: 1rem;
    }
}

@media (min-width: 1200px) {
    .site-header__brand-name {
        font-size: 1.2rem;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .site-header__bar,
    .site-header__toggle-line,
    .site-header__panel,
    .site-header__backdrop,
    .site-header__brand-name,
    .site-header__brand-tag,
    .logo-mark__bg,
    .logo-mark__wave {
        transition: none;
    }
}