:root {
    --background-color: #000000;
    --accent-color: #900000;
    --text-color: #cc3333;
    --border-color: #990000;
    --scrollbar-thumb-color: #550000;
    --input-bg-color: #330000;
    --font-family: 'Courier New', Courier, monospace;
}


body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: var(--font-family);
    margin: 0;
    padding: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 98vh;
    accent-color: var(--accent-color) !important;
    scrollbar-color: var(--scrollbar-thumb-color) var(--background-color);
}

input {
    appearance: none;
    position: relative;
    width: 1rem;
    height: 1rem;
    border: 1px solid;
    font-family: var(--font-family);
    line-height: 1;
    background: var(--input-bg-color);
    color: var(--border-color);
}

    input[type="checkbox"]::before {
        position: absolute;
        width: 100%;
        height: 100%;
        text-align: center;
        white-space: pre;
        content: " ";
    }

    input[type="checkbox"]:checked::before {
        content: "\2713";
    }

.app-container {
    display: flex;
    border: 2px solid var(--border-color);
    width: 95%;
    height: 90%;
    background-color: var(--background-color);
}

.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    padding: 10px;
    position: relative;
    min-width: 0; /* MODIFIED: Removed max-width */
}

.image-view-container {
    flex-grow: 1;
    border: 1px solid var(--border-color);
    position: relative;
    display: grid;
    place-items: center;
    overflow: auto;
}

#canvasOutput {
    max-width: none;
    max-height: none;
}


.zoom-controls {
    position: absolute;
    background-color: transparent;
    bottom: 20px;
    right: 35px;
    display: flex;
    align-items: center;
    border: 1px solid var(--border-color);
}

    .zoom-controls span {
        padding: 0 20px;
    }

.zoom-buttons button {
    background-color: transparent;
    border: none;
    border-left: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 5px 10px;
    font-weight: bold;
    cursor: pointer;
}

.sidebar {
    width: 25%;
    flex-shrink: 0;
    border-left: 2px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: relative; /* Anchor for theme popup */
}

.title-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 10px;
    border-bottom: 2px solid var(--border-color);
}

.title-buttons .window-button {
    background-color: var(--background-color);
    border: 2px solid var(--border-color);
    min-height: 24px;
    font-weight: bold;
    margin-left: 5px;
    width: 30px;
    cursor: pointer;
}

.controls-container {
    padding: 15px;
    flex-grow: 1;
    overflow-y: auto;
}

hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 15px 0;
}

.control-group {
    margin-bottom: 15px;
    gap: 10px;
}

    .control-group label, .control-group span {
        font-size: 14px;
    }

.top-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}

    .top-controls label {
        display: inline;
    }

#qualitySpan {
    margin-left: auto;
    /* Adjust spacing between theme and about buttons if needed */
    display: flex;
    gap: 5px; /* Added gap for spacing between buttons */
}

#colorSpace, #colorSpace2, #colorSpace3 {
    display: inline-flex;
    margin-left: auto;
}

.dropdown-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

    .dropdown-group select {
        width: 110px !important;
    }


#themeButton, #aboutButton { /* Apply common styles to both buttons */
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-family: var(--font-family);
    cursor: pointer;
    font-size: 1rem;
    padding: 2px 6px;
    /* margin-left: 10px; */ /* Removed as gap handles spacing */
}

    #themeButton:hover, #aboutButton:hover {
        background-color: var(--input-bg-color);
    }

.dual-slider {
    display: flex;
    justify-content: space-between;
}

    .dual-slider > div {
        flex-basis: 48%;
    }

.hue-controls > div {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.hue-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}


.sobel-controls, .laplacian-controls {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

input[type="range"] {
    width: 100%;
}

input[type="color"] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 100%;
    height: 25px;
    background-color: transparent;
    border: 1px solid var(--border-color);
    cursor: pointer;
}

    input[type="color"]::-webkit-color-swatch-wrapper {
        padding: 0;
    }

    input[type="color"]::-webkit-color-swatch {
        border: none;
    }


input[type="number"], select {
    background-color: var(--background-color);
    color: var(--text-color);
    width: 40px;
    border: 1px solid var(--border-color);
    padding: 5px;
    font-family: inherit;
}

select {
    width: 90px !important;
    display: flex;
    margin-left: auto;
}


textarea {
    width: 100%;
    height: 100px;
    background-color: var(--background-color);
    color: var(--accent-color);
    border: 1px solid var(--border-color);
    resize: none;
    font-family: inherit;
    padding: 5px;
    box-sizing: border-box; 
}

.theme-popup {
    display: none; /* Hidden by default */
    position: absolute;
    top: 45px; 
    right: 15px; 
    width: 300px;
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    z-index: 1000;
    padding: 10px;
}

.theme-popup-header {
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
    margin-bottom: 10px;
}

.popup-button {
    width: 100%;
    background-color: var(--input-bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    font-family: inherit;
    padding: 5px;
    cursor: pointer;
    margin-top: 5px;
}

    .popup-button:hover {
        border-color: var(--text-color);
    }


.drag-over {
    border-style: dashed !important;
    border-color: var(--text-color) !important;
}

/* --- Tab Styles --- */

.tab-content {
    display: none;
}

.tabs-container {
    margin-top: 15px;
    margin-bottom: 15px;
    border-top: 1px solid var(--border-color);
}

.tabs {
    display: flex;
}

.tab-button {
    background-color: transparent;
    border: 1px solid transparent;
    border-top: 0;
    color: var(--text-color);
    font-family: var(--font-family);
    padding: 0 14px;
    cursor: pointer;
    font-size: 14px;
}

    .tab-button:hover {
        background-color: var(--input-bg-color);
    }

    .tab-button.active {
        border-color: var(--border-color);
    }

.tab-content {
    display: none;
    padding-top: 5px;
}

    .tab-content.active {
        display: block;
    }

.hue-controls-container {
    margin-top: 15px;
    margin-bottom: 15px;
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

.hue2-toggle {
    margin-top: 15px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.hue-toggle-button {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-family: var(--font-family);
    padding: 0 8px;
    cursor: pointer;
    font-size: 14px;
    margin-left: 8px;
    min-width: 20px;
}

    .hue-toggle-button:hover {
        background-color: var(--input-bg-color);
    }


.hue-title-section {
    display: flex;
    align-items: center;
}

.hue2-content {
    margin-top: 15px;
}

    .hue2-content > div {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }