/* --- Default Light Theme --- */
:root {
    --primary-color: #007bff;
    --tool-bg: #f0f2f5;
    --panel-bg: #ffffff;
    --border-color: #dee2e6;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --input-bg: #ffffff;
    --secondary-btn-bg: #6c757d;
    --copy-btn-bg: #f8f9fa;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--tool-bg);
    color: var(--text-primary);
    margin: 0;
    padding: 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    display: flex;
    gap: 20px;
    max-width: 1400px;
    margin: 0 auto;
    height: 85vh;
}

.main-content {
    flex-grow: 1;
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.canvas-wrapper {
    width: 100%;
    height: 100%;
    overflow: auto;
    display: flex;
    justify-content: center;
    align-items: center;
    /* Light checkerboard */
    background-image: linear-gradient(45deg, #eee 25%, transparent 25%), linear-gradient(-45deg, #eee 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #eee 75%), linear-gradient(-45deg, transparent 75%, #eee 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    cursor: grab;
}

#canvas.pannable, #canvas.panning { cursor: grab; }
#canvas.panning { cursor: grabbing; }

.upload-prompt {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #999;
    font-size: 18px;
    pointer-events: none;
}

.loupe {
    width: 100px; height: 100px; border-radius: 50%;
    border: 3px solid #fff; box-shadow: 0 0 10px rgba(0,0,0,0.5);
    position: absolute; pointer-events: none; overflow: hidden;
}

#loupeCanvas { image-rendering: pixelated; image-rendering: -moz-crisp-edges; image-rendering: crisp-edges; }

.controls-panel {
    width: 320px; flex-shrink: 0; background-color: var(--panel-bg); padding: 20px;
    border-radius: 8px; border: 1px solid var(--border-color);
}

h3 {
    margin: 20px 0 10px; font-size: 16px;
    border-bottom: 1px solid var(--border-color); padding-bottom: 10px;
}
h3:first-child { margin-top: 0; }

.upload-section { display: flex; gap: 10px; margin-bottom: 20px; }
.upload-section button {
    flex-grow: 1; font-size: 16px; padding: 12px;
    background: var(--primary-color); color: white; border: none;
    border-radius: 8px; cursor: pointer; transition: background-color 0.2s;
}
.upload-section button:hover { background-color: #0b5ed7; }
.upload-section .secondary-btn { background-color: var(--secondary-btn-bg); }
.upload-section .secondary-btn:hover { background-color: #5a6268; }

.view-controls { margin-bottom: 20px; }
.option-note { font-size: 12px; color: var(--text-secondary); text-align: center; }

.preview-box { display: flex; gap: 15px; align-items: center; }
#colorPreview { width: 60px; height: 60px; border-radius: 8px; border: 1px solid var(--border-color); background-color: #fff; }
.color-info { flex-grow: 1; }
.info-row { display: flex; align-items: center; margin-bottom: 5px; }
.info-row label { width: 40px; font-size: 14px; color: var(--text-secondary); }
.info-row input {
    flex-grow: 1; padding: 4px 6px; border: 1px solid var(--border-color);
    border-radius: 4px; font-size: 13px; font-family: 'Courier New', Courier, monospace;
    background-color: var(--input-bg); color: var(--text-primary);
}
.copy-btn {
    font-size: 12px; padding: 4px 8px; margin-left: 5px;
    background: var(--copy-btn-bg); color: var(--text-primary);
    border: 1px solid var(--border-color); border-radius: 4px; cursor: pointer;
}

.palette { display: flex; flex-wrap: wrap; gap: 10px; padding-top: 10px; min-height: 30px; }
.palette-placeholder { font-size: 14px; color: var(--text-secondary); }
.palette-color {
    width: 30px; height: 30px; border-radius: 50%; border: 1px solid #ccc;
    cursor: pointer; position: relative; transition: transform 0.2s;
}
.palette-color:hover { transform: scale(1.1); }
.palette-color .color-code {
    display: none; position: absolute; bottom: 110%; left: 50%;
    transform: translateX(-50%); background-color: #333; color: white;
    padding: 3px 6px; border-radius: 4px; font-size: 12px; white-space: nowrap;
}
.palette-color:hover .color-code { display: block; }


/* --- Dark Mode Overrides --- */
body.dark-mode {
    --primary-color: #3d8bfd;
    --tool-bg: #1e2128;
    --panel-bg: #2a2e37;
    --border-color: #4a505f;
    --text-primary: #e5e7eb;
    --text-secondary: #9ca3af;
    --input-bg: #373c47;
    --secondary-btn-bg: #4a505f;
    --copy-btn-bg: #4a505f;
}

body.dark-mode .canvas-wrapper {
    /* Dark checkerboard */
    background-image: linear-gradient(45deg, #2a2e37 25%, transparent 25%), linear-gradient(-45deg, #2a2e37 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #2a2e37 75%), linear-gradient(-45deg, transparent 75%, #2a2e37 75%);
}

body.dark-mode .upload-section button:hover {
    background-color: #4c9aff;
}

body.dark-mode .upload-section .secondary-btn:hover {
    background-color: #5a6268;
}

body.dark-mode .palette-color {
    border-color: #777;
}
.converter-grid { display: grid; gap: 8px; margin-bottom: 12px; }
.converter-grid input, .gradient-controls textarea {
    width: 100%; box-sizing: border-box; padding: 8px; border-radius: 4px; border: 1px solid var(--border-color);
    background-color: var(--input-bg); color: var(--text-primary); font-family: inherit;
}
.converter-grid button, .gradient-controls button.wide { width: 100%; padding: 10px; }
.gradient-controls { display: grid; gap: 8px; }
.gradient-controls input[type="color"] { width: 100%; height: 38px; border: 1px solid var(--border-color); background: var(--input-bg); border-radius: 6px; }
.gradient-preview { height: 84px; border-radius: 8px; border: 1px solid var(--border-color); }
.palette-color.copied { transform: scale(1.15); box-shadow: 0 0 0 3px rgba(0,123,255,0.25); }
@media (max-width: 960px) {
  .container { flex-direction: column; height: auto; }
  .main-content { min-height: 50vh; }
  .controls-panel { width: auto; }
}