.transparency-grid {
    background-color: #ffffff;
    background-image: linear-gradient(45deg, #e2e8f0 25%, transparent 25%),
                      linear-gradient(-45deg, #e2e8f0 25%, transparent 25%),
                      linear-gradient(45deg, transparent 75%, #e2e8f0 75%),
                      linear-gradient(-45deg, transparent 75%, #e2e8f0 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}
.preview-img-box {
    height: 350px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}
.preview-img-box img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}
.preview-processing-state {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 20px;
    color: #2563eb;
    background: rgba(248, 250, 252, .92);
    font-size: 15px;
    font-weight: 600;
    text-align: center;
}
.preview-processing-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid #bfdbfe;
    border-top-color: #2563eb;
    border-radius: 50%;
    animation: background-remover-spin .8s linear infinite;
}
@keyframes background-remover-spin {
    to { transform: rotate(360deg); }
}
.preview-fill-controls {
    padding: 14px;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    background: #ffffff;
}
.preview-download-btn {
    min-height: 52px;
    border-radius: 8px;
    background-color: #16a34a;
    border-color: #16a34a;
}
.background-fill-palette {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}

.background-fill-swatch,
.background-fill-picker {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 2px solid #d7dee8;
    border-radius: 8px;
    background: var(--fill-color, #ffffff);
    color: #475569;
    cursor: pointer;
    transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}

.background-fill-swatch:hover,
.background-fill-picker:hover,
.background-fill-swatch.is-active {
    border-color: #2563eb;
    box-shadow: 0 0 0 2px rgba(37, 99, 235, .18);
    transform: translateY(-1px);
}

.background-fill-swatch[data-fill="transparent"] {
    background-color: #ffffff;
    background-image: linear-gradient(45deg, #e2e8f0 25%, transparent 25%),
                      linear-gradient(-45deg, #e2e8f0 25%, transparent 25%),
                      linear-gradient(45deg, transparent 75%, #e2e8f0 75%),
                      linear-gradient(-45deg, transparent 75%, #e2e8f0 75%);
    background-size: 12px 12px;
    background-position: 0 0, 0 6px, 6px -6px, -6px 0;
}

.background-fill-picker {
    overflow: hidden;
    background: conic-gradient(#ff0000, #ffff00, #00ff00, #00ffff, #0000ff, #ff00ff, #ff0000);
}

.background-fill-picker input[type="color"] {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.background-fill-picker i {
    color: #ffffff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, .35);
    pointer-events: none;
}

#transparent-preview-box.has-background-fill {
    background-image: none;
}

#background-remover-upload-zone {
    cursor: pointer;
    transition: border-color .2s ease, background-color .2s ease, transform .2s ease;
}

#background-remover-upload-zone:hover,
#background-remover-upload-zone.dragover {
    border-color: #2d8bd8;
    background-color: #eff6ff;
    transform: translateY(-1px);
}

#progress-container .progress-file-icon {
    flex: 0 0 50px;
}

#progress-status-text {
    white-space: nowrap;
}

#download-transparent-btn {
    min-width: 190px;
}

#download-transparent-btn.is-processing {
    cursor: wait;
    opacity: .75;
}

#download-transparent-btn:disabled {
    pointer-events: none;
}

.feat-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

@media (max-width: 767.98px) {
    #progress-container {
        padding: 16px !important;
    }

    #progress-container .d-flex.align-items-center {
        align-items: flex-start !important;
        flex-wrap: wrap;
        gap: 10px !important;
    }

    #progress-container .flex-grow-1 {
        min-width: 0;
        flex: 1 1 calc(100% - 64px);
    }

    #progress-container .d-flex.justify-content-between {
        display: block !important;
    }

    #progress-file-name,
    #progress-file-size,
    #progress-status-text {
        display: block;
        max-width: 100%;
        overflow-wrap: anywhere;
    }

    #progress-status-text {
        margin-top: 5px;
    }

    #progress-container .progress {
        width: 100%;
        margin-top: 8px;
    }

    #progress-container #cancel-progress-btn {
        margin-left: auto !important;
        flex: 0 0 auto;
    }

    #download-transparent-btn {
        width: 100%;
        min-height: 52px;
        white-space: normal;
    }

    .background-fill-palette {
        gap: 8px;
    }

    .background-fill-swatch,
    .background-fill-picker {
        width: 38px;
        height: 38px;
    }

    .preview-img-box {
        height: min(62vw, 300px);
    }
}