/* 
  Image Brightness/Contrast Tool CSS
  Uses Neo-brutalism design system
*/

.image-bc-tool-container {
  /* Colors - Light Mode */
  --bg-primary: #f5f5f0;
  --bg-secondary: #fff;
  --bg-section: #fff;
  --border-color: #333;
  --text-primary: #222;
  --text-secondary: #555;
  --text-light: #666;
  --color-accent: #3498db;
  --color-success: #27ae60;
  --color-warning: #f39c12;
  --color-danger: #e74c3c;
  --color-purple: #9b59b6;
  
  /* Shadows */
  --shadow-sm: 2px 2px 0 rgba(0,0,0,0.1);
  --shadow-md: 4px 4px 0 rgba(0,0,0,0.15);
  --shadow-lg: 8px 8px 0 rgba(0,0,0,0.15);
  
  /* Layout */
  --radius-container: 8px;
  --radius-section: 6px;
  --radius-button: 4px;
  --radius-input: 4px;
}

/* Dark Mode Variables (Manual .dark class) */
.image-bc-tool-container.dark {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-section: #2d2d2d;
  --border-color: #e0e0e0;
  --text-primary: #e8e8e8;
  --text-secondary: #b0b0b0;
  --text-light: #909090;
  --color-accent: #5dade2;
  --color-success: #52c77a;
  --color-warning: #f5b041;
  --color-danger: #ec7063;
  --color-purple: #af7ac5;
  
  --shadow-sm: 2px 2px 0 rgba(255,255,255,0.08);
  --shadow-md: 4px 4px 0 rgba(255,255,255,0.12);
  --shadow-lg: 8px 8px 0 rgba(255,255,255,0.12);
}

/* System Dark Mode Auto Detection */
@media (prefers-color-scheme: dark) {
  .image-bc-tool-container:not(.dark):not(.light) {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-section: #2d2d2d;
    --border-color: #e0e0e0;
    --text-primary: #e8e8e8;
    --text-secondary: #b0b0b0;
    --text-light: #909090;
    --color-accent: #5dade2;
    --color-success: #52c77a;
    --color-warning: #f5b041;
    --color-danger: #ec7063;
    --color-purple: #af7ac5;
    
    --shadow-sm: 2px 2px 0 rgba(255,255,255,0.08);
    --shadow-md: 4px 4px 0 rgba(255,255,255,0.12);
    --shadow-lg: 8px 8px 0 rgba(255,255,255,0.12);
  }
}

/* Main Container */
.image-bc-tool-container {
  position: relative;
  max-width: 1000px; /* Spacious for image preview */
  width: 100%;
  margin: 8px auto;
  padding: 8px;
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-container);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Malgun Gothic', sans-serif;
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  box-sizing: border-box;
}

.image-bc-tool-container *, 
.image-bc-tool-container *::before, 
.image-bc-tool-container *::after {
  box-sizing: border-box;
}

/* Dark Mode Toggle */
.dark-mode-toggle {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 6px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px; /* ⭐ Requested: 8px */
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 2px 2px 0 rgba(0,0,0,0.15);
  font-size: 17.5px;
  z-index: 10;
}

.dark-mode-toggle:hover {
  transform: translate(0.5px, 0.5px);
  box-shadow: 1.5px 1.5px 0 rgba(0,0,0,0.15);
}

/* Header */
.header {
  margin-bottom: 12px;
}

.main-title {
  margin: 0 0 4px 0;
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.subtitle {
  margin: 0;
  font-size: 16px;
  color: var(--text-light);
}

/* Grid Layout */
.main-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

/* Sections */
.input-section, .result-section {
  background: var(--bg-section);
  padding: 8px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-section);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-color);
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
}

/* Upload Area */
.upload-area {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-input);
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 8px;
  background: var(--bg-secondary);
}

.upload-area:hover, .upload-area.drag-over {
  border-color: var(--color-accent);
  background: rgba(52, 152, 219, 0.05);
}

.upload-content p {
  margin: 8px 0 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.upload-content .sub-text {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-light);
}

/* Analysis Box */
.analysis-box {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.analysis-item {
  flex: 1;
  padding: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-input);
  text-align: center;
}

.analysis-item .label {
  display: block;
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 2px;
}

.analysis-item .value {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
}

/* Controls */
.control-group {
  margin-bottom: 12px;
}

.control-group label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 500;
}

input[type="range"] {
  width: 100%;
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  outline: none;
  -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--color-accent);
  border: 1.5px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

/* Canvas/Preview */
.canvas-wrapper {
  position: relative;
  width: 100%;
  min-height: 300px;
  background: repeating-conic-gradient(#ccc 0% 25%, #fff 0% 50%) 50% / 20px 20px; /* Checkerboard for transparent */
  border: 1px solid var(--border-color);
  border-radius: var(--radius-input);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-bottom: 8px;
  flex-grow: 1;
}

canvas {
  max-width: 100%;
  max-height: 400px;
  object-fit: contain;
}

.placeholder-text {
  position: absolute;
  color: #555;
  font-size: 16px;
  font-weight: 500;
  padding: 20px;
  text-align: center;
  background: rgba(255,255,255,0.8);
  border-radius: 4px;
}

/* Watermark */
.watermark {
  position: absolute;
  bottom: 8px;
  right: 8px;
  font-size: 14px;
  font-weight: 600;
  color: rgba(255,255,255,0.8);
  text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
  pointer-events: none;
  display: none; /* Shown via JS when needed or valid image */
}

/* Buttons */
.save-image-btn {
  width: 100%;
  padding: 8px 16px;
  background: var(--color-purple);
  color: #fff;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-button);
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: 4px 4px 0 rgba(0,0,0,0.2);
  margin-top: auto;
}

.save-image-btn:disabled {
  background: var(--text-light);
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.save-image-btn:not(:disabled):hover {
  transform: translate(1px, 1px);
  box-shadow: 3px 3px 0 rgba(0,0,0,0.2);
  filter: brightness(1.05);
}

.save-image-btn:not(:disabled):active {
  transform: translate(4px, 4px);
  box-shadow: none;
}

.button-group {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.sample-btn, .reset-btn {
  flex: 1;
  padding: 8px;
  font-size: 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: 2px 2px 0 rgba(0,0,0,0.2);
  color: #fff;
}

.sample-btn { background: var(--color-success); }
.reset-btn { background: var(--color-warning); }

.sample-btn:hover, .reset-btn:hover {
  transform: translate(0.5px, 0.5px);
  box-shadow: 1.5px 1.5px 0 rgba(0,0,0,0.2);
}

.sample-btn:active, .reset-btn:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

.reset-btn:disabled {
  background: var(--text-light);
  cursor: not-allowed;
  box-shadow: none;
}

/* Result Stats */
.result-stats {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  padding: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.stat-item {
  font-size: 15px;
  color: var(--text-secondary);
}

.stat-item strong {
  color: var(--color-accent);
  font-size: 17px;
  margin-left: 4px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 10px 16px;
  background: var(--text-primary);
  color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  font-size: 16px;
  font-weight: 500;
  box-shadow: 4px 4px 0 rgba(0,0,0,0.3);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
}

.toast.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(-5px);
}

.toast.error { background: var(--color-danger); color: #fff; }
.toast.success { background: var(--color-success); color: #fff; }

/* Responsive */
@media (max-width: 768px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
  .image-bc-tool-container {
    width: calc(100% - 10px);
    margin: 6px 5px;
    padding: 7px;
  }
}