/* Image Mode Switcher Styles */

.modeControl {
    --pad: 4px;
    position: relative;
    width: fit-content;
    display: flex;
    gap: 4px;
    padding: var(--pad);
    background: var(--cardBgClr);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 1rem;
    margin: 1rem auto 0.75rem;
}

.modeControl .highlight {
    position: absolute;
    top: var(--pad);
    left: var(--pad);
    height: calc(100% - (var(--pad) * 2));
    width: 0; /* Will be set by JS */
    background: var(--btnGradNormal);
    border-radius: 0.7rem;
    z-index: 1;
    /* Only animate movement/size; gradient swap is instantaneous (background gradients don't interpolate) */
    transition: transform 300ms ease, width 300ms ease;
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.15),
        0 4px 10px -4px rgba(0, 0, 0, 0.7);
}

.modeBtn {
    position: relative;
    z-index: 2;
    background: none;
    border: 0;
    font: inherit;
    padding: 0.55rem 1.1rem;
    border-radius: 0.7rem;
    cursor: pointer;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: hsl(200 70% 95% / 1);
    transition: color 200ms ease, opacity 200ms;
    font-family: "Nunito", sans-serif;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
}

.modeBtn:focus-visible {
    outline: 2px solid var(--accent, #0077ff);
    outline-offset: 2px;
}

.modeControl[data-active="normal"] .highlight {
    background: var(--btnGradNormal);
}

.modeControl[data-active="dark"] .highlight {
    background: linear-gradient(90deg, #0f161f, #0b1215);
}

.modeControl[data-active="contrast"] .highlight {
    background: linear-gradient(90deg, #1b512d, #2e8b57);
}

.modeControl[data-active="normal"] .modeBtn[data-mode="normal"],
.modeControl[data-active="dark"] .modeBtn[data-mode="dark"],
.modeControl[data-active="contrast"] .modeBtn[data-mode="contrast"] {
    color: #fff;
}

@media (max-width: 600px) {
    .modeBtn {
        padding: 0.5rem 0.85rem;
        font-size: 0.85rem;
    }
}

/* Per-image processing spinner */
.expandableImg { 
    position: relative; 
}

.imgSpinner {
    --spinner-size: 34px;
    position: absolute;
    top: 50%;
    left: 50%;
    width: var(--spinner-size);
    height: var(--spinner-size);
    margin: calc(var(--spinner-size) / -2) 0 0 calc(var(--spinner-size) / -2);
    border-radius: 50%;
    border: 4px solid rgba(255,255,255,0.15);
    border-top-color: var(--accent, #0af);
    animation: spin 1s linear infinite;
    pointer-events: none;
    opacity: 0;
    transition: opacity 180ms ease;
    backdrop-filter: blur(2px);
}

.imgSpinner.active { 
    opacity: 1; 
}

@keyframes spin { 
    to { 
        transform: rotate(360deg); 
    } 
}