/**
 * SearXNG Theme Toggle — CSS (v4)
 * Split from theme-toggle.js for better caching + cleaner separation.
 */

/* ─── View Transitions smooth crossfade ─── */
::view-transition-old(root),
::view-transition-new(root) {
    animation-duration: 0.4s;
    animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Button base ─── */
#sxng-theme-toggle {
    width: 2.1rem;
    height: 2.1rem;
    padding: 0;
    background: color-mix(in srgb, Canvas 75%, transparent);
    backdrop-filter: blur(12px) saturate(160%);
    -webkit-backdrop-filter: blur(12px) saturate(160%);
    border: 2px solid transparent;
    border-radius: 50%;
    color: CanvasText;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    vertical-align: middle;
    box-shadow: 0 2px 6px color-mix(in srgb, CanvasText 8%, transparent),
    inset 0 1px 0 color-mix(in srgb, Canvas 50%, transparent);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
    border-color 0.25s ease,
    box-shadow 0.25s ease,
    background 0.25s ease;
}

#sxng-theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px color-mix(in srgb, CanvasText 15%, transparent);
}

#sxng-theme-toggle:active {
    transform: scale(0.92);
    transition-duration: 0.1s;
}

#sxng-theme-toggle:focus-visible {
    outline: 2px solid color-mix(in srgb, CanvasText 50%, transparent);
    outline-offset: 3px;
}

#sxng-theme-toggle svg {
    pointer-events: none;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

#sxng-theme-toggle:active svg {
    transform: rotate(20deg);
}

/* ─── Per-mode visual indicators ─── */
#sxng-theme-toggle[data-theme="auto"] {
    border-color: #94a3b8;
    color: #64748b;
}

#sxng-theme-toggle[data-theme="light"] {
    border-color: #f59e0b;
    color: #f59e0b;
    background: color-mix(in srgb, #fef3c7 50%, transparent);
}

#sxng-theme-toggle[data-theme="dark"] {
    border-color: #a78bfa;
    color: #a78bfa;
    background: color-mix(in srgb, #1e1b4b 50%, transparent);
}

#sxng-theme-toggle[data-theme="black"] {
    border-color: #f87171;
    color: #f87171;
    background: color-mix(in srgb, #000 50%, transparent);
}

/* ─── Position variants ─── */
.sxng-theme-toggle-inline {
    margin: 0 0.7rem 0 0;
}

.sxng-theme-toggle-floating {
    position: fixed;
    top: 3.5rem;
    right: 1rem;
    z-index: 9999;
}

/* ─── Toast feedback ─── */
#sxng-theme-toast {
    position: fixed;
    top: 4rem;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background: color-mix(in srgb, CanvasText 92%, transparent);
    color: Canvas;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: 0 10px 25px color-mix(in srgb, CanvasText 20%, transparent);
    opacity: 0;
    pointer-events: none;
    backdrop-filter: blur(10px);
    transition: opacity 0.2s ease, transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 10000;
    white-space: nowrap;
}

#sxng-theme-toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ─── Mobile responsive ─── */
@media (max-width: 640px) {
    .sxng-theme-toggle-floating {
        top: 3rem;
        right: 0.5rem;
    }

    #sxng-theme-toggle {
        width: 2rem;
        height: 2rem;
    }

    #sxng-theme-toggle svg {
        width: 18px;
        height: 18px;
    }
}

/* ─── Reduced motion ─── */
@media (prefers-reduced-motion: reduce) {
    #sxng-theme-toggle,
    #sxng-theme-toggle svg,
    #sxng-theme-toast,
    ::view-transition-old(root),
    ::view-transition-new(root) {
        animation: none !important;
        transition: none !important;
    }
}