/*
 * Safari iOS: samples position:fixed nodes near the viewport bottom.
 * Transparent .fspn-root is the fixed anchor; glass lives on .fspn-nav only.
 * Gap dot + trailing div fill the space between pill and browser toolbar.
 */
.fspn-root {
    position: fixed;
    z-index: var(--fspn-z, 9999);
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0;
    padding: 0;
    background: transparent;
    pointer-events: none;
    transition: opacity .25s ease;
    will-change: transform;
}

.fspn-root .fspn-nav {
    pointer-events: auto;
}

.fspn-nav {
    position: relative;
    isolation: isolate;
    max-width: min(96vw, 880px);
    margin: 0;
    padding: 8px;
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 8px;
    overflow-x: auto;
    scrollbar-width: none;
    border-radius: var(--fspn-radius);
    border: 1px solid var(--fspn-border);
    background-color: var(--fspn-bg-start);
    background-image: linear-gradient(150deg, var(--fspn-bg-start), var(--fspn-bg-end));
    backdrop-filter: blur(18px) saturate(150%);
    -webkit-backdrop-filter: blur(18px) saturate(150%);
    box-shadow: var(--fspn-shadow);
    transition: transform .3s ease, opacity .3s ease;
}

.fspn-nav::-webkit-scrollbar { display: none; }

.fspn-nav::after {
    content: "";
    position: absolute;
    inset: 1px;
    z-index: 0;
    border-radius: calc(var(--fspn-radius) - 1px);
    pointer-events: none;
    background: radial-gradient(circle at 22% 8%, rgba(255, 255, 255, 0.85), transparent 45%),
        radial-gradient(circle at 80% 120%, rgba(255, 255, 255, 0.28), transparent 46%);
    opacity: .9;
}

.fspn-item {
    position: relative;
    z-index: 1;
}

.fspn-toolbar-gap {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 8px;
    width: 100%;
    background: transparent;
    pointer-events: none;
}

.fspn-gap-dot {
    font-size: 6px;
    line-height: 1;
    color: transparent;
    user-select: none;
    pointer-events: none;
}

.fspn-after {
    min-height: 4px;
    width: 1px;
    background: transparent;
    pointer-events: none;
}

.fspn-root.fspn-vv-collapsed .fspn-toolbar-gap {
    min-height: 0;
    opacity: 0;
}

.fspn-root.fspn-vv-collapsed .fspn-after {
    min-height: 0;
}

.fspn-root.pos-bottom-center {
    bottom: calc(16px + var(--fspn-pill-bottom-extra, 0px));
    left: 50%;
    transform: translate3d(-50%, calc(-1 * var(--fspn-vv-bottom-offset, 0px)), 0);
}

.fspn-root.pos-top-center {
    top: 16px;
    left: 50%;
    transform: translate3d(-50%, 0, 0);
}

.fspn-root.pos-bottom-left {
    bottom: calc(16px + var(--fspn-pill-bottom-extra, 0px));
    left: 16px;
    transform: translate3d(0, calc(-1 * var(--fspn-vv-bottom-offset, 0px)), 0);
}

.fspn-root.pos-bottom-right {
    bottom: calc(16px + var(--fspn-pill-bottom-extra, 0px));
    right: 16px;
    left: auto;
    transform: translate3d(0, calc(-1 * var(--fspn-vv-bottom-offset, 0px)), 0);
}

.fspn-nav.theme-midnight {
    background: linear-gradient(160deg, rgba(17, 24, 39, 0.72), rgba(31, 41, 55, 0.54));
    border-color: rgba(255, 255, 255, 0.2);
}

.fspn-nav.theme-sunset {
    background: linear-gradient(155deg, rgba(255, 201, 154, 0.72), rgba(255, 157, 176, 0.5));
    border-color: rgba(255, 255, 255, 0.35);
}

.fspn-link {
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--fspn-text);
    font-size: var(--fspn-font-size);
    font-weight: var(--fspn-font-weight);
    text-transform: var(--fspn-transform);
    padding: 10px 14px;
    border-radius: calc(var(--fspn-radius) - 8px);
    white-space: nowrap;
    transition: transform .22s ease, background-color .22s ease, box-shadow .22s ease, color .22s ease;
}

.fspn-nav.icon-top .fspn-link { flex-direction: column; gap: 4px; }
.fspn-item.is-active .fspn-link {
    background-color: var(--fspn-active-bg);
    background-image: none;
    color: var(--fspn-active-text);
}
.fspn-nav.anim-hover .fspn-link:hover { transform: translateY(-2px); }
.fspn-nav.anim-active .fspn-item.is-active .fspn-link { transform: scale(1.03); }
.fspn-link.is-pressed {
    transform: scale(0.96);
}
.fspn-link::after {
    content: "";
    position: absolute;
    width: 8px;
    height: 8px;
    border-radius: 999px;
    left: var(--ripple-x, 50%);
    top: var(--ripple-y, 50%);
    background: radial-gradient(circle, rgba(255, 255, 255, 0.65), rgba(255, 255, 255, 0));
    transform: translate(-50%, -50%) scale(1);
    opacity: 0;
    pointer-events: none;
}
.fspn-link.do-ripple::after {
    animation: fspn-ripple .5s ease-out;
}

.fspn-root.pos-bottom-center .fspn-nav,
.fspn-root.pos-top-center .fspn-nav {
    width: max-content;
}

.fspn-root.pos-bottom-center.anim-float,
.fspn-root.pos-top-center.anim-float {
    animation: fspn-float 2.8s ease-in-out infinite;
}

.fspn-root.pos-bottom-left.anim-float,
.fspn-root.pos-bottom-right.anim-float {
    animation: fspn-float-side 2.8s ease-in-out infinite;
}

.fspn-root.pos-bottom-center.anim-slidein,
.fspn-root.pos-top-center.anim-slidein {
    animation: fspn-slidein .45s ease-out both;
}

.fspn-root.pos-bottom-left.anim-slidein,
.fspn-root.pos-bottom-right.anim-slidein {
    animation: fspn-slidein-side .45s ease-out both;
}

.fspn-icon { width: 16px; height: 16px; font-size: 16px; }

.fspn-root.pos-bottom-center.is-hidden,
.fspn-root.pos-top-center.is-hidden {
    opacity: 0;
    pointer-events: none;
}

.fspn-root.pos-bottom-center.is-hidden {
    transform: translate3d(-50%, calc(14px - var(--fspn-vv-bottom-offset, 0px)), 0);
}

.fspn-root.pos-top-center.is-hidden {
    transform: translate3d(-50%, 14px, 0);
}

.fspn-root.pos-bottom-left.is-hidden,
.fspn-root.pos-bottom-right.is-hidden {
    opacity: 0;
    pointer-events: none;
    transform: translate3d(0, calc(14px - var(--fspn-vv-bottom-offset, 0px)), 0);
}

@keyframes fspn-slidein {
    from { opacity: 0; transform: translate3d(-50%, calc(20px - var(--fspn-vv-bottom-offset, 0px)), 0); }
    to { opacity: 1; transform: translate3d(-50%, calc(-1 * var(--fspn-vv-bottom-offset, 0px)), 0); }
}

@keyframes fspn-slidein-side {
    from { opacity: 0; transform: translate3d(0, calc(20px - var(--fspn-vv-bottom-offset, 0px)), 0); }
    to { opacity: 1; transform: translate3d(0, calc(-1 * var(--fspn-vv-bottom-offset, 0px)), 0); }
}

@keyframes fspn-float {
    0%,100% { transform: translate3d(-50%, calc(-1 * var(--fspn-vv-bottom-offset, 0px)), 0); }
    50% { transform: translate3d(-50%, calc(-3px - var(--fspn-vv-bottom-offset, 0px)), 0); }
}

@keyframes fspn-float-side {
    0%,100% { transform: translate3d(0, calc(-1 * var(--fspn-vv-bottom-offset, 0px)), 0); }
    50% { transform: translate3d(0, calc(-3px - var(--fspn-vv-bottom-offset, 0px)), 0); }
}

@keyframes fspn-ripple {
    0% { opacity: .8; transform: translate(-50%, -50%) scale(1); }
    100% { opacity: 0; transform: translate(-50%, -50%) scale(20); }
}

@media (max-width: 768px) {
    .fspn-nav {
        max-width: min(99.5vw, 960px);
        padding: 6px;
        gap: 6px;
        box-shadow: var(--fspn-shadow-mobile);
        border-color: var(--fspn-border-mobile, var(--fspn-border));
    }

    .fspn-link {
        font-size: 14px;
        padding: 8px 12px;
        gap: 6px;
        border-radius: calc(var(--fspn-radius) - 6px);
        -webkit-tap-highlight-color: transparent;
    }

    .fspn-nav.icon-top .fspn-link {
        gap: 3px;
    }

    .fspn-icon {
        width: 15px;
        height: 15px;
        font-size: 15px;
    }

    .fspn-root.pos-bottom-center .fspn-nav,
    .fspn-root.pos-top-center .fspn-nav {
        max-width: calc(100vw - 6px - env(safe-area-inset-left, 0px) - env(safe-area-inset-right, 0px));
    }

    .fspn-toolbar-gap {
        min-height: 10px;
    }

    .fspn-after {
        min-height: env(safe-area-inset-bottom, 0px);
    }

    @supports (-webkit-touch-callout: none) {
        .fspn-root.fspn-vv-collapsed .fspn-after {
            min-height: env(safe-area-inset-bottom, 0px);
        }
    }

    .fspn-nav.theme-midnight {
        border-color: rgba(255, 255, 255, 0.07);
    }

    .fspn-nav.theme-sunset {
        border-color: rgba(255, 255, 255, 0.14);
    }
}