:root {
    --site-nav-top: 12px;
    --site-nav-height: 48px;
    --site-nav-space: calc(var(--site-nav-top) + var(--site-nav-height) + 12px);
    --nav-btn-height: 36px;
    --gear-size: 42px;
    --nav-inset: 210px;
    --nav-text: #f8fbff;
    --nav-accent: #63b3ed;
    --nav-accent-deep: #2b6cb0;
    --page-brand-glow: rgba(99, 179, 237, 0.45);
    --site-nav-width: 640px;

    /* Liquid-glass surface shared by the nav, brand pill and gear */
    --glass-bg:
        linear-gradient(
            160deg,
            rgba(255, 255, 255, 0.32) 0%,
            rgba(255, 255, 255, 0.1) 42%,
            rgba(255, 255, 255, 0.06) 60%,
            rgba(255, 255, 255, 0.16) 100%
        );
    --glass-blur: blur(24px) saturate(190%);
    --glass-border: 1px solid rgba(255, 255, 255, 0.22);
    --glass-shadow:
        0 10px 34px rgba(8, 20, 40, 0.28),
        0 2px 8px rgba(8, 20, 40, 0.16),
        inset 0 1px 0 rgba(255, 255, 255, 0.55),
        inset 0 -1px 2px rgba(255, 255, 255, 0.08);
}

body.has-site-nav {
    padding-top: var(--site-nav-space);
}

nav.site-nav {
    position: fixed;
    top: var(--site-nav-top);
    right: 16px;
    left: auto;
    transform: none;
    /* Right-aligned pill that hugs its buttons; never grows under the brand. */
    width: min(var(--site-nav-width), calc(100% - var(--nav-inset)));
    max-width: calc(100% - var(--nav-inset));
    min-height: var(--site-nav-height);
    height: var(--site-nav-height);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0;
    padding: 0 12px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: 999px;
    box-shadow: var(--glass-shadow);
    z-index: 1000;
    transition:
        opacity 0.28s ease,
        visibility 0.28s ease,
        transform 0.28s ease;
}

/* Welcome carries the gear on the right, so shift the bar clear of it */
body.has-settings nav.site-nav {
    right: calc(16px + var(--gear-size) + 12px);
    width: min(var(--site-nav-width), calc(100% - var(--nav-inset) - var(--gear-size) - 12px));
}

body.overlay-open nav.site-nav {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-16px);
}

/* Lock the page behind any open overlay: the background can't scroll and the
   window scrollbar disappears, so the only scrollbar is the panel's own. */
body.overlay-open {
    overflow: hidden;
}

/* Every overlay dims + blurs the page behind it the same way */
.overlay-backdrop,
.video-backdrop,
.rewards-backdrop {
    background: rgba(6, 14, 26, 0.72);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* Every overlay shell can scroll when content is taller than the viewport */
.overlay,
.video-overlay {
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
}

/* Mental Choices full pages + immersive overlays: no floating nav */
body.avatar-page.has-site-nav {
    padding-top: var(--site-nav-space);
}

body.avatar-page nav.site-nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
}

.site-nav .nav-links {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    justify-content: flex-end;
    width: 100%;
    gap: 10px;
    padding: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
}

/* Brand is its own floating glass pill, matching the nav bar */
.page-brand {
    position: fixed;
    top: var(--site-nav-top);
    left: 16px;
    height: var(--site-nav-height);
    display: inline-flex;
    align-items: center;
    padding: 0 20px;
    z-index: 1001;
    font-family: 'Nunito', 'Segoe UI', Arial, sans-serif;
    font-size: 1.3rem;
    font-weight: 900;
    letter-spacing: -0.02em;
    text-decoration: none;
    white-space: nowrap;
    line-height: 1;
    color: #fff;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: 999px;
    box-shadow: var(--glass-shadow);
    text-shadow: 0 1px 2px rgba(8, 20, 40, 0.35), 0 0 14px var(--page-brand-glow);
    transition:
        transform 0.22s cubic-bezier(0.34, 1.56, 0.64, 1),
        box-shadow 0.2s ease;
}

.page-brand:hover {
    transform: translateY(-2px) scale(1.03);
    box-shadow:
        0 14px 38px rgba(8, 20, 40, 0.32),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

body.overlay-open .page-brand {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* Settings gear — fixed top-right, mirrors the glass nav */
.settings-gear {
    position: fixed;
    top: calc(var(--site-nav-top) + (var(--site-nav-height) - var(--gear-size)) / 2);
    right: 16px;
    z-index: 1001;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: var(--gear-size);
    height: var(--gear-size);
    padding: 0;
    color: var(--nav-text);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: 50%;
    box-shadow: var(--glass-shadow);
    overflow: hidden;
    isolation: isolate;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    transition:
        transform 0.24s cubic-bezier(0.34, 1.56, 0.64, 1),
        background 0.2s ease,
        box-shadow 0.2s ease;
}

.settings-gear svg {
    position: relative;
    z-index: 1;
    display: block;
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.settings-gear:hover {
    transform: scale(1.12);
    box-shadow:
        0 10px 26px rgba(8, 20, 40, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.settings-gear:hover svg {
    transform: rotate(90deg);
}

.settings-gear:active {
    transform: scale(1.04);
}

.settings-gear:focus-visible {
    outline: 2px solid var(--nav-accent);
    outline-offset: 2px;
}

body.overlay-open .settings-gear,
body.avatar-page .settings-gear {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.site-nav .nav-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    height: var(--nav-btn-height);
    min-height: var(--nav-btn-height);
    max-height: var(--nav-btn-height);
    /* content-width, right-aligned; min-width keeps the boxes uniform */
    flex: 0 0 auto;
    min-width: 0;
    padding: 0 30px;
    border: none;
    outline: none;
    border-radius: 999px;
    background: transparent;
    color: var(--nav-text);
    font-family: 'Nunito', 'Segoe UI', Arial, sans-serif;
    font-size: 0.86rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: 0.01em;
    text-decoration: none;
    cursor: pointer;
    white-space: nowrap;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    box-shadow: none;
    transform: scale(1);
    transform-origin: center center;
    transition:
        transform 0.24s cubic-bezier(0.34, 1.56, 0.64, 1),
        color 0.2s ease,
        background 0.2s ease,
        box-shadow 0.2s ease,
        opacity 0.2s ease;
}

.site-nav a.nav-btn,
.site-nav button.nav-btn {
    height: var(--nav-btn-height);
    min-height: var(--nav-btn-height);
    max-height: var(--nav-btn-height);
    padding: 0 16px;
    font-size: 0.86rem;
    line-height: 1;
    border: none;
    outline: none;
    background: transparent;
    box-shadow: none;
}

.site-nav button.nav-btn {
    appearance: none;
    -webkit-appearance: none;
}

.site-nav .nav-btn:hover {
    opacity: 1;
    transform: scale(1.06);
    color: #ffffff;
    border: none;
    background: rgba(255, 255, 255, 0.16);
    box-shadow: 0 6px 18px rgba(8, 20, 40, 0.28);
}

.site-nav .nav-btn:active {
    transform: scale(1.02);
    opacity: 1;
}

.site-nav .nav-btn:focus,
.site-nav .nav-btn:focus-visible {
    outline: none;
    box-shadow: none;
}

.site-nav .nav-links a.nav-btn-fill,
.site-nav .nav-links button.nav-btn-fill,
.site-nav .nav-links a.btn-fill,
.site-nav .nav-links button.btn-fill {
    border: none;
    background: transparent;
    color: var(--nav-text);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    box-shadow: none;
}

.site-nav .nav-links a.nav-btn-fill:hover,
.site-nav .nav-links button.nav-btn-fill:hover,
.site-nav .nav-links a.btn-fill:hover,
.site-nav .nav-links button.btn-fill:hover {
    border: none;
    background: rgba(255, 255, 255, 0.16);
    color: #ffffff;
    box-shadow: 0 6px 18px rgba(8, 20, 40, 0.28);
    opacity: 1;
}

.site-nav .nav-btn.active {
    border: none;
    background: rgba(255, 255, 255, 0.14);
    color: #ffffff;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.22);
}

.site-nav .nav-btn.active:hover {
    box-shadow: none;
}

body.user-logged-in .site-nav .nav-btn {
    flex: 1 1 0;
}

body.user-logged-out nav.site-nav {
    width: fit-content;
}

body.user-logged-out .site-nav .nav-links {
    justify-content: center;
    width: auto;
}

body.user-logged-out .site-nav .nav-btn {
    min-width: 140px;
}

.page-brand.active {
    box-shadow:
        0 14px 38px rgba(8, 20, 40, 0.34),
        inset 0 0 0 1px rgba(255, 255, 255, 0.28),
        inset 0 1px 0 rgba(255, 255, 255, 0.62);
}

@media (max-width: 760px) {
    :root {
        --site-nav-height: 40px;
        --nav-btn-height: 30px;
        --gear-size: 36px;
        --nav-inset: 150px;
        --site-nav-space: calc(var(--site-nav-top) + var(--site-nav-height) + 8px);
    }

    nav.site-nav {
        padding: 0 8px;
    }

    .page-brand {
        left: 10px;
        font-size: 1rem;
        padding: 0 14px;
    }

    .settings-gear {
        right: 10px;
    }

    .settings-gear svg {
        width: 19px;
        height: 19px;
    }

    .site-nav .nav-links {
        gap: 3px;
    }

    .site-nav .nav-btn,
    .site-nav a.nav-btn,
    .site-nav button.nav-btn {
        padding: 0 10px;
        font-size: 0.74rem;
        height: var(--nav-btn-height);
        min-height: var(--nav-btn-height);
        max-height: var(--nav-btn-height);
    }

    /* Slightly gentler pop on small screens so buttons don't collide */
    .site-nav .nav-btn:hover {
        transform: scale(1.08);
    }

    body.user-logged-out .site-nav .nav-btn {
        min-width: 118px;
    }
}