/* GoatPaletteGenerator.css */
/* ==========================================================================
    Root Variables
   ========================================================================== */
:root {
    --color-preview-box-width: 226px;
    --min-width-picker-wrapper: 780px;
    --radius-global: 4px;
    --size-checkerboard: 16px;
    --width-input-shared: 45px;
    --width-unit-span: 10px;

    --slider-track-height: 28px;
    --slider-thumb-height: calc(var(--slider-track-height) + 8px);
    --slider-thumb-width: 12px;
    --slider-value-input-width: 40px;

    /* Default Dark Theme Colors. @media Light Theme at bottom of file */
    --color-bg-button-hover: #666;
    --color-bg-button-swatch-copy-hover: hsl(0 0% 0% / 0.7);
    --color-bg-button-swatch-copy: hsl(0 0% 0% / 0.5);
    --color-bg-button: #555;
    --color-bg-checkerboard: #404040;
    --color-bg-control-surface: #333;
    --color-bg-input-darker: #222;
    --color-bg-input: #444;
    --color-bg-page: #1a1a1a;
    --color-bg-slider-group-active: hsl(0 0% 0% / 0.22);
    --color-bg-slider-thumb: #ddd;
    --color-bg-tab-active: var(--color-bg-control-surface);
    --color-bg-tab: #222;
    --color-bg-text-swatch-hover: hsl(0 0% 15% / 0.85);
    --color-border-control-surface: #4f4f4f;
    --color-border-input: #555;
    --color-border-slider-thumb: #777;
    --color-checkerboard-pattern: #505050;
    --color-outline-drag-over: hsl(211 100% 50%);
    --color-shadow-drag-over: hsl(211 100% 50% / 0.5);
    --color-text-button-hover: #fff;
    --color-text-button-swatch-copy: #fff;
    --color-text-button: #ddd;
    --color-text-heading: #999;
    --color-text-inactive: #555;
    --color-text-input: #ccc;
    --color-text-page-secondary: #999;
    --color-text-page: #ddd;
    --color-text-swatch-hover: #eee;
    --color-text-tab-active: #fff;
    --color-text-tab: #aaa;

    --color-bg-slider-track: #4a4a4a; /* Default track background */
    --color-border-slider-track: hsl(0 0% 0% / 0.2); /* Default track border */
    --shadow-slider-thumb: 0 1px 2px hsl(0 0% 0% / 0.25);

    /* For JS-driven slider tracks */
    --background-image-slider-track-saturation: transparent;
    --background-image-slider-track-lightness: transparent;
    --background-image-slider-track-oklch-l: linear-gradient(to right, #777, #777);
    --background-image-slider-track-oklch-c: linear-gradient(to right, #777, #777);
    --background-image-slider-track-oklch-h: linear-gradient(to right, #777, #777); /* Fallback for OKLCH H */
    --background-image-slider-track-opacity: linear-gradient(to right, hsla(0, 0%, 50%, 0), hsl(0, 0%, 50%));
}

/* ==========================================================================
    Global Styles & Resets
   ========================================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: "Source Code Pro", Menlo, Consolas, Monaco, "Liberation Mono", "Lucida Console", monospace;
    font-size: 16px;
}

body {
    align-items: center;
    background: var(--color-bg-page);
    color: var(--color-text-page);
    display: flex;
    flex-direction: column;
    margin: 0;
    min-height: 100%;
    padding: 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
    width: 100%;
}

h1 {
    font-size: 1.5em;
    letter-spacing: 0.1em;
    margin: 20px auto 40px;
    text-transform: uppercase;
}
.h1-char {
    display: inline-block;
    padding: 0.1em 0.39em;
    border-radius: var(--radius-global);
    margin: 0 0.1em;
    min-width: 0.6em;
    text-align: center;
    transition: background-color 0.4s ease-out, color 0.4s ease-out;
}

button,
input,
form,
label,
select,
textarea {
    font-size: inherit;
    font-family: inherit;
}

/* ==========================================================================
    Utility Classes
   ========================================================================== */
.checkerboard-element {
    position: absolute;
    inset: 0;
    background-size: var(--size-checkerboard) var(--size-checkerboard);
    background-position: 0 0, 0 calc(var(--size-checkerboard) / 2), calc(var(--size-checkerboard) / 2) calc(var(--size-checkerboard) / -2), calc(var(--size-checkerboard) / -2) 0px;
    z-index: 1;
    background-image: linear-gradient(45deg, var(--color-checkerboard-pattern) 25%, transparent 25%), linear-gradient(-45deg, var(--color-checkerboard-pattern) 25%, transparent 25%), linear-gradient(45deg, transparent 75%, var(--color-checkerboard-pattern) 75%), linear-gradient(-45deg, transparent 75%, var(--color-checkerboard-pattern) 75%);
    background-color: var(--color-bg-checkerboard);
}

.color-overlay-element {
    position: absolute;
    inset: 0;
    z-index: 2;
}

.visually-hidden {
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    height: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
    width: 1px;
}

/* ==========================================================================
    Main Layout & Page Structure
   ========================================================================== */
.main-controls-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 25px;
    margin-bottom: 30px;
    align-items: stretch;
    justify-content: center;
}

.picker-and-tabs-column {
    display: flex;
    flex-direction: column;
}

/* ==========================================================================
    Tab Component
   ========================================================================== */
.tabs {
    display: flex;
    flex-shrink: 0;
}
.tabs button {
    padding: 10px 15px;
    border: 1px solid var(--color-border-control-surface);
    cursor: pointer;
    border-top-left-radius: var(--radius-global);
    border-top-right-radius: var(--radius-global);
    margin-right: 2px;
    outline: none;
    border-bottom: none;
    transition: background-color 0.2s ease, color 0.2s ease;
    background-color: var(--color-bg-tab);
    color: var(--color-text-tab);
}
.tabs button.active {
    font-weight: bold;
    position: relative;
    z-index: 2;
    margin-bottom: -1px;
    background-color: var(--color-bg-tab-active);
    color: var(--color-text-tab-active);
    border-bottom-color: var(--color-bg-tab-active) !important;
}

.tab-content {
    display: none;
}
.tab-content.active {
    display: block;
}

/* ==========================================================================
    Picker Column & Color Preview (HSL & OKLCH)
   ========================================================================== */
.picker-column {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    padding: 15px;
    border-radius: var(--radius-global);
    border: 1px solid var(--color-border-control-surface);
    box-shadow: 0 2px 5px hsl(0 0% 0% / 0.1);
    background-color: var(--color-bg-control-surface);
    min-width: var(--min-width-picker-wrapper);
}

.tabs + .picker-column {
    border-top: none;
    border-top-left-radius: 0;
}

.compact-picker-wrapper {
    display: flex;
    align-items: stretch;
    gap: 10px;
    background-color: transparent;
}
.color-preview-box {
    width: var(--color-preview-box-width);
    align-self: stretch;
    border: 2px solid var(--color-border-input);
    border-radius: var(--radius-global);
    position: relative;
    flex-shrink: 0;
    overflow: hidden;
    aspect-ratio: 1 / 1;
}
.compact-picker-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
}

/* ==========================================================================
    Slider Group Component (Shared by HSL & OKLCH pickers)
   ========================================================================== */
.slider-group {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 1px;
    border-radius: var(--radius-global);
    transition: background-color 0.2s ease-in-out;
}
.slider-group.selected-for-increment {
    background-color: var(--color-bg-slider-group-active);
}
.slider-group label {
    flex-shrink: 0;
    margin: 0 0 0 15px;
    text-align: left;
    color: var(--color-text-page);
}
.slider-group > span {
    line-height: 1;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: var(--width-unit-span);
    color: var(--color-text-page-secondary);
    font-size: 0.9em;
    margin-left: 3px;
    text-align: left;
}

/* ==========================================================================
    Shared Input Styles (Number Inputs, Range Sliders)
   ========================================================================== */
.slider-value-input {
    -moz-appearance: textfield;
    appearance: textfield;
    background-color: var(--color-bg-input);
    border-radius: var(--radius-global);
    border: 1px solid var(--color-border-input);
    color: var(--color-text-input);
    flex-shrink: 0;
    font-size: 0.85em;
    padding: 4px 6px;
    text-align: right;
    width: var(--slider-value-input-width);
}

.slider-value-input::-webkit-inner-spin-button,
.slider-value-input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.color-string-input-group {
    margin-top: 4px;
    margin-bottom: 4px;
    padding-right: 54px; /* Align with controls that have a radio button */
}
.color-string-input {
    background-color: var(--color-bg-input);
    border: 1px solid var(--color-border-input);
    border-radius: var(--radius-global);
    color: var(--color-text-input);
    flex-grow: 1;
    font-size: 0.85em;
    padding: 4px 8px;
    width: 100%;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.color-string-input:focus {
    border-color: var(--color-outline-drag-over);
    box-shadow: 0 0 0 1px var(--color-outline-drag-over);
}
.color-string-input.invalid {
    border-color: hsl(0, 70%, 50%);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    flex-grow: 1;
    height: var(--slider-track-height);
    background-color: var(--color-bg-slider-track); /* Default track background */
    border: 1px solid var(--color-border-slider-track);
    cursor: pointer;
    border-radius: var(--radius-global);
    min-width: 50px;
    padding: 0;
    outline: none;
    opacity: 0.95;
    transition: opacity 0.2s;
    box-sizing: border-box;
}
input[type="range"]:hover {
    opacity: 1;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    height: var(--slider-thumb-height);
    width: var(--slider-thumb-width);
    border-radius: var(--radius-global);
    cursor: pointer;
    background: var(--color-bg-slider-thumb);
    border: 2px solid var(--color-border-slider-thumb);
    box-shadow: var(--shadow-slider-thumb);
    margin-top: calc((var(--slider-track-height) - var(--slider-thumb-height)) / 2);
}

input[type="range"]::-moz-range-thumb {
    appearance: none;
    height: var(--slider-thumb-height);
    width: var(--slider-thumb-width);
    border-radius: var(--radius-global);
    cursor: pointer;
    background: var(--color-bg-slider-thumb);
    border: 2px solid var(--color-border-slider-thumb);
    box-shadow: var(--shadow-slider-thumb);
}

/* ==========================================================================
    Specific Slider Track Backgrounds
   ========================================================================== */
/* HSL Hue Slider - Fixed HSL Rainbow */
input[type="range"].hue-slider {
    /* Affects #base-hue-slider */
    background-image: linear-gradient(to right, hsl(0 100% 50%), hsl(60 100% 50%), hsl(120 100% 50%), hsl(180 100% 50%), hsl(240 100% 50%), hsl(300 100% 50%), hsl(0 100% 50%));
    border: none !important;
}

/* OKLCH Hue Slider - Dynamically set by JS */
input[type="range"].oklch-h-slider {
    /* Affects #oklch-h-slider */
    background-image: var(--background-image-slider-track-oklch-h);
    /* Uses default border from input[type="range"] */
}

input[type="range"].saturation-slider {
    background-image: var(--background-image-slider-track-saturation);
    border: none !important;
}

input[type="range"].lightness-slider {
    background-image: var(--background-image-slider-track-lightness);
    border: none !important;
}

input[type="range"].oklch-l-slider {
    background-image: var(--background-image-slider-track-oklch-l);
    border: none !important;
}

input[type="range"].oklch-c-slider {
    background-image: var(--background-image-slider-track-oklch-c);
    border: none !important;
}

input[type="range"].opacity-slider {
    background-color: var(--color-bg-checkerboard); /* Base for checkerboard pattern */
    background-image: var(--background-image-slider-track-opacity), /* Transparency gradient on top */ linear-gradient(45deg, var(--color-checkerboard-pattern) 25%, transparent 25%), linear-gradient(-45deg, var(--color-checkerboard-pattern) 25%, transparent 25%), linear-gradient(45deg, transparent 75%, var(--color-checkerboard-pattern) 75%), linear-gradient(-45deg, transparent 75%, var(--color-checkerboard-pattern) 75%);
    background-size: auto, /* For the opacity gradient */ var(--size-checkerboard) var(--size-checkerboard), var(--size-checkerboard) var(--size-checkerboard), var(--size-checkerboard) var(--size-checkerboard), var(--size-checkerboard) var(--size-checkerboard);
    background-position: 0 0, /* For opacity gradient */ 0 0, 0 calc(var(--size-checkerboard) / 2), calc(var(--size-checkerboard) / 2) calc(var(--size-checkerboard) / -2), calc(var(--size-checkerboard) / -2) 0px;
    background-repeat: no-repeat, /* Opacity gradient */ repeat, repeat, repeat, repeat; /* Checkerboard parts */
    /* Uses default border from input[type="range"] */
}

/* ==========================================================================
    Inline Increment Controls
   ========================================================================== */
.vary-param-selector-inline {
    display: inline-flex;
    align-items: center;
    margin-left: 8px;
}

.vary-param-selector-inline input[type="radio"] {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    width: 0;
    height: 0;
    margin: 0;
    position: absolute;
    opacity: 0;
}

.vary-param-selector-inline .tick-label {
    border-radius: var(--radius-global);
    border: 1px solid transparent;
    color: var(--color-text-inactive);
    cursor: pointer;
    display: inline-block;
    font-size: 1.4em;
    font-weight: normal;
    line-height: 1;
    padding: 0px 6px;
    transition: color 0.2s ease, transform 0.1s ease;
    user-select: none;
}

.vary-param-selector-inline input[type="radio"]:checked + .tick-label {
    color: var(--color-text-tab-active);
    transform: scale(1.2);
}
.vary-param-selector-inline input[type="radio"]:focus-visible + .tick-label {
    outline: 2px solid var(--color-outline-drag-over);
    outline-offset: 1px;
}

.vary-param-selector-inline .tick-label:hover {
    color: var(--color-text-page);
}

.flex-grow-placeholder {
    flex-grow: 1;
    min-width: 1px;
}

.vary-param-selector-placeholder {
    width: 54px;
    flex-shrink: 0;
}

.increment-control-group-inline > label {
    text-align: left !important;
    white-space: nowrap;
    margin-right: 8px;
}
.increment-control-group-inline {
    margin-top: 15px;
}

/* ==========================================================================
    Export Controls
   ========================================================================== */
.export-controls {
    align-items: center;
    border-radius: var(--radius-global);
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    margin-bottom: 30px;
    margin-top: 20px;
    padding: 15px;
    background-color: var(--color-bg-control-surface);
}
.export-controls .control-group {
    border: 1px solid var(--color-border-control-surface);
    border-radius: var(--radius-global);
    display: flex;
    flex-direction: column;
    padding: 8px;
}
.export-controls .control-group > label {
    color: var(--color-text-page);
    margin-bottom: 10px;
    align-self: center;
}
.export-controls .radio-group {
    align-items: center;
    display: flex;
    gap: 10px;
    margin-top: 5px;
    flex-wrap: wrap;
    justify-content: center;
}
.export-controls .radio-group label {
    color: var(--color-text-page);
}
.export-controls .radio-group input[type="radio"] {
    margin-right: 3px;
    margin-top: 0;
}

.export-controls button {
    border: none;
    border-radius: var(--radius-global);
    cursor: pointer;
    padding: 8px 15px;
    transition: background-color 0.2s ease, color 0.2s ease;
    background-color: var(--color-bg-button);
    color: var(--color-text-button);
}
.export-controls button:hover {
    background-color: var(--color-bg-button-hover);
    color: var(--color-text-button-hover);
}

/* ==========================================================================
    Info Panel
   ========================================================================== */
.info-panel {
    background-color: var(--color-bg-input-darker);
    border-radius: var(--radius-global);
    border: 1px solid var(--color-border-control-surface);
    color: var(--color-text-page-secondary);
    font-size: 0.9em;
    line-height: 1.4;
    max-width: 800px;
    padding: 10px 15px;
    text-align: left;
    margin: 40px auto 20px;
    transition: color 0.3s ease;
}
.info-panel:hover {
    color: var(--color-text-page);
}
.info-panel ul {
    margin-top: 5px;
    margin-bottom: 5px;
    padding-left: 20px;
}
.info-panel li {
    margin-bottom: 3px;
}

#oklchInfoPanel {
    opacity: 0;
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    margin-top: 0;
    margin-bottom: 0;
    overflow: hidden;
    transition: opacity 0.3s ease-in-out, max-height 0.3s ease-in-out, padding-top 0.3s ease-in-out, padding-bottom 0.3s ease-in-out, margin-top 0.3s ease-in-out, margin-bottom 0.3s ease-in-out;
}

#oklchInfoPanel.visible {
    opacity: 1;
    max-height: 500px;
    padding-top: 10px;
    padding-bottom: 10px;
    margin-top: 40px;
    margin-bottom: 20px;
}

/* ==========================================================================
    Palette Container & Color Swatches
   ========================================================================== */
#palette-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    margin: 20px 0 70px;
}
.color-item {
    align-items: center;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.color-input-main {
    border: 1px solid var(--color-border-input);
    border-radius: var(--radius-global);
    font-size: 0.75rem;
    height: 80px;
    width: 150px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}
.color-input-main .swatch-hover-text {
    display: none;
    position: absolute;
    color: var(--color-text-swatch-hover);
    background-color: var(--color-bg-text-swatch-hover);
    padding: 3px 5px;
    border-radius: var(--radius-global);
    text-align: center;
    z-index: 3;
    pointer-events: none;
    white-space: normal;
    box-shadow: 0 1px 2px hsl(0 0% 0% / 0.2);
    max-width: 90%;
    word-break: break-all;
}
.color-input-main:hover .swatch-hover-text {
    display: block;
}

.swatch-copy-button {
    position: absolute;
    top: 4px;
    right: 4px;
    background: var(--color-bg-button-swatch-copy);
    color: var(--color-text-button-swatch-copy);
    border: none;
    border-radius: 3px;
    padding: 3px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s ease-in-out;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 0;
    z-index: 4;
}
.color-input-main:hover .swatch-copy-button {
    opacity: 1;
}
.swatch-copy-button:hover {
    background: var(--color-bg-button-swatch-copy-hover);
}
.swatch-copy-button svg {
    display: block;
}

/* ==========================================================================
    Drag and Drop Styling
   ========================================================================== */
.color-preview-box.drag-over {
    outline: 2px dashed var(--color-outline-drag-over);
    outline-offset: 2px;
    box-shadow: 0 0 10px var(--color-shadow-drag-over);
}

/* ==========================================================================
    Light Theme Overrides
   ========================================================================== */
@media (prefers-color-scheme: light) {
    :root {
        --color-bg-page: #e3e3e3;
        --color-bg-button: #bbb;
        --color-bg-button-hover: #666;
        --color-text-button-hover: #fff;
        --color-text-button: #222;
        --color-bg-checkerboard: #f0f0f0;
        --color-checkerboard-pattern: #ccc;
        --color-bg-control-surface: #d0d0d0;
        --color-border-control-surface: #bbb;
        --color-outline-drag-over: hsl(211 100% 35%);
        --color-shadow-drag-over: hsl(211 100% 35% / 0.4);
        --color-bg-input-darker: #e0e0e0;
        --color-bg-input: #f0f0f0;
        --color-border-input: #aaa;
        --color-text-input: #222;
        --color-bg-slider-group-active: hsl(0 0% 0% / 0.03);
        --color-bg-button-swatch-copy: hsl(0 0% 100% / 0.6);
        --color-bg-button-swatch-copy-hover: hsl(0 0% 100% / 0.8);
        --color-text-button-swatch-copy: #333;
        --color-bg-text-swatch-hover: hsl(0 0% 94% / 0.85);
        --color-text-swatch-hover: #333;
        --color-bg-tab-active: var(--color-bg-control-surface);
        --color-text-tab-active: hsl(202 60% 34%);
        --color-bg-tab: #e0e0e0;
        --color-text-tab: #555;
        --color-text-heading: #333;
        --color-text-inactive: #bbb;
        --color-text-page: #2e2e2e;
        --color-text-page-secondary: #555;
        --color-bg-slider-thumb: #666;
        --color-border-slider-thumb: #444;

        --color-bg-slider-track: #e0e0e0;
        --color-border-slider-track: hsl(0 0% 0% / 0.12);
        --shadow-slider-thumb: 0 1px 2px hsl(0 0% 0% / 0.15);

        /* Light theme JS-driven slider track fallbacks if needed */
        --background-image-slider-track-oklch-l: linear-gradient(to right, #ccc, #808080);
        --background-image-slider-track-oklch-c: linear-gradient(to right, #ccc, #808080);
        --background-image-slider-track-oklch-h: linear-gradient(to right, #ccc, #808080);
        --background-image-slider-track-opacity: linear-gradient(to right, rgba(128, 128, 128, 0), rgba(128, 128, 128, 1));
    }
    .vary-param-selector-inline .tick-label {
        color: var(--color-text-inactive);
    }
}