/* ============================================================================
   NAVIGATION — Glassmorphism Sticky Nav + Mobile Hamburger
   ============================================================================ */

.navbar {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: var(--glass-border);
    transition: box-shadow var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--nav-height);
}

/* ── Brand / Logo ── */
.nav-brand a {
    text-decoration: none;
    color: inherit;
}

.nav-brand-text {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--color-primary);
    font-family: var(--font-heading);
    font-size: 1.375rem;
    font-weight: var(--weight-bold);
    letter-spacing: var(--tracking-tight);
}

.logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-primary-gradient);
    border-radius: var(--radius-sm);
    font-family: var(--font-heading);
    font-weight: var(--weight-extrabold);
    font-size: var(--text-h4);
    color: white;
    letter-spacing: -1px;
    flex-shrink: 0;
}

/* ── Nav Menu (Mobile: hidden) ── */
.nav-menu {
    display: none;
    list-style: none;
}

.nav-menu a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: var(--weight-medium);
    font-size: var(--text-body-sm);
    transition: color var(--transition-fast);
}

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

.nav-menu a.active,
.nav-menu a[aria-current="page"] {
    color: var(--color-primary);
    font-weight: var(--weight-semibold);
    border-bottom: 2px solid var(--color-primary);
    padding-bottom: 2px;
}

/* Nav CTA */
.nav-cta {
    background: var(--color-primary-gradient) !important;
    color: var(--color-text-on-primary) !important;
    padding: var(--space-2) var(--space-5) !important;
    border-radius: var(--radius-xl) !important;
    font-weight: var(--weight-semibold) !important;
    min-height: 44px;
    display: inline-flex !important;
    align-items: center;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: var(--shadow-primary-sm);
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-primary-lg) !important;
}

.nav-cta:focus-visible {
    outline: 2px solid var(--color-text) !important;
    outline-offset: 2px;
}

/* ── Hamburger Toggle ── */
.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    padding: 10px;
    background: transparent;
    border: none;
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
    background-color: rgba(11, 122, 117, 0.1);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    min-height: 2px;
    background: var(--color-text);
    margin: 4px 0;
    transition: transform var(--transition-slow), opacity var(--transition-slow);
    border-radius: 2px;
}

/* ── Mobile Menu Active ── */
.nav-menu.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: var(--shadow-lg);
    padding: var(--space-4) 0;
    border-top: var(--glass-border);
    z-index: var(--z-modal);
    max-height: calc(100vh - var(--nav-height));
    overflow-y: auto;
}

.nav-menu.active li {
    width: 100%;
}

.nav-menu.active a {
    display: block;
    padding: var(--space-4) var(--space-6);
    font-size: var(--text-body);
}

.nav-menu.active a:hover {
    background: var(--color-surface-low);
}

/* ── Desktop Nav ── */
@media (min-width: 768px) {
    .nav-menu {
        display: flex;
        align-items: center;
        gap: var(--space-8);
    }

    .nav-toggle {
        display: none;
    }
}

/* ============================================================================
   PS-NAV — Direction A variant (Phase 2 forward)
   ============================================================================
   Used by `<header class="ps-nav">` on rebuilt pages. Coexists with `.navbar`
   so legacy pages keep rendering unchanged.
   ============================================================================ */

.ps-nav {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 48px;
    border-bottom: 1px solid var(--ps-line);
    background: rgba(246, 245, 241, 0.9);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    gap: 24px;
}

/* Brand */
.ps-nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--ps-ink);
}

.ps-nav-logo {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--ps-teal);
    color: #fff;
    font-family: var(--ps-font-display);
    font-style: italic;
    font-size: 17px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    letter-spacing: -0.02em;
    flex-shrink: 0;
}

.ps-nav-wordmark {
    font-family: var(--ps-font-display);
    font-size: 22px;
    color: var(--ps-ink);
    letter-spacing: -0.012em;
}

/* Menu (desktop) */
.ps-nav-menu {
    display: none;
    align-items: center;
    gap: 30px;
    font-size: 14px;
    color: var(--ps-ink);
    font-weight: 500;
}

.ps-nav-menu a {
    position: relative;
    color: var(--ps-ink);
    text-decoration: none;
    padding: 6px 0;
    transition: color 150ms ease;
}

.ps-nav-menu a:hover { color: var(--ps-teal); }

.ps-nav-menu a:focus-visible {
    outline: 2px solid var(--ps-teal);
    outline-offset: 4px;
    border-radius: 2px;
}

.ps-nav-menu a[aria-current="page"] {
    color: var(--ps-teal);
}

.ps-nav-menu a[aria-current="page"]::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 2px;
    background: var(--ps-teal);
    border-radius: 2px;
}

/* Right-side actions */
.ps-nav-actions {
    display: none;
    gap: 12px;
    align-items: center;
}

.ps-nav-signin {
    font-size: 13px;
    color: var(--ps-ink-muted);
    text-decoration: none;
    padding: 10px 6px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    transition: color 150ms ease;
}

.ps-nav-signin:hover { color: var(--ps-ink); }

.ps-nav-signin:focus-visible {
    outline: 2px solid var(--ps-teal);
    outline-offset: 2px;
    border-radius: 2px;
}

.ps-nav-cta {
    background: var(--ps-ink);
    color: #fff;
    padding: 10px 18px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: background-color 150ms ease;
}

.ps-nav-cta:hover { background: var(--ps-teal-deep); }

.ps-nav-cta:focus-visible {
    outline: 2px solid var(--ps-teal);
    outline-offset: 2px;
}

/* Mobile hamburger toggle */
.ps-nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    padding: 10px;
    background: transparent;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 150ms ease;
}

.ps-nav-toggle:hover,
.ps-nav-toggle:focus-visible {
    background-color: rgba(15, 30, 28, 0.06);
    outline: none;
}

.ps-nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--ps-ink);
    margin: 3px 0;
    transition: transform 200ms ease, opacity 200ms ease;
    border-radius: 2px;
}

/* Mobile menu open state */
.ps-nav-menu.is-open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(246, 245, 241, 0.98);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    padding: 16px 24px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--ps-line);
    box-shadow: var(--ps-shadow);
    z-index: var(--z-modal);
}

.ps-nav-menu.is-open a {
    padding: 14px 8px;
    font-size: 16px;
    border-bottom: 1px solid var(--ps-line);
}

.ps-nav-menu.is-open a:last-child {
    border-bottom: none;
}

/* Mobile-only sign-in/CTA inside the open menu */
.ps-nav-menu.is-open .ps-nav-cta-mobile {
    margin-top: 12px;
    background: var(--ps-ink);
    color: #fff;
    text-align: center;
    border-radius: 999px;
    border: none;
    padding: 14px 18px;
}

@media (min-width: 768px) {
    .ps-nav-menu,
    .ps-nav-actions {
        display: flex;
    }
    .ps-nav-toggle { display: none; }
}

@media (max-width: 768px) {
    .ps-nav { padding: 14px 24px; }
    .ps-nav-wordmark { font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
    .ps-nav-menu a,
    .ps-nav-signin,
    .ps-nav-cta,
    .ps-nav-toggle,
    .ps-nav-toggle span {
        transition: none;
    }
}