/* 
  Black & White Photo Generator CSS
  - Neobrutalism design
  - Dark mode support
  - Mobile responsive
*/

/* ============================================
   CSS Variables - Light Mode (Default)
   ============================================ */
.black-and-white-photo-generator-container {
  --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;
  --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);
  --radius-container: 8px;
  --radius-section: 6px;
  --radius-button: 4px;
  --radius-input: 4px;
  --input-focus-bg: #fffacd;
  --preview-bg: #1a1a1a;
}

/* ============================================
   Dark Mode
   ============================================ */
.black-and-white-photo-generator-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);
  --input-focus-bg: #3a3a3a;
  --preview-bg: #111;
}

/* System dark mode auto detection */
@media (prefers-color-scheme: dark) {
  .black-and-white-photo-generator-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);
    --input-focus-bg: #3a3a3a;
    --preview-bg: #111;
  }
}

/* ============================================
   Global Box Sizing
   ============================================ */
.black-and-white-photo-generator-container,
.black-and-white-photo-generator-container *,
.black-and-white-photo-generator-container *::before,
.black-and-white-photo-generator-container *::after {
  box-sizing: border-box;
}

/* ============================================
   Main Container
   ============================================ */
.black-and-white-photo-generator-container {
  position: relative;
  max-width: 1000px;
  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);
  line-height: 1.5;
}

/* ============================================
   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: var(--radius-button);
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
  font-size: 15.5px;
  font-weight: 600;
  color: var(--text-primary);
  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);
}

.dark-mode-toggle:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

/* ============================================
   Header
   ============================================ */
.header {
  margin-bottom: 10px;
  padding-right: 50px;
}

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

.subtitle {
  font-size: 13.5px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ============================================
   2-Column Grid Layout
   ============================================ */
.main-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 8px;
  align-items: start;
}

/* ============================================
   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);
}

.result-section {
  display: flex;
  flex-direction: column;
  min-height: 500px;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-color);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.section-header svg {
  stroke: var(--color-accent);
  flex-shrink: 0;
}

.mt-12 {
  margin-top: 12px;
}

/* ============================================
   Upload Button
   ============================================ */
.input-group {
  margin-bottom: 8px;
}

.upload-btn {
  width: 100%;
  padding: 14px;
  background: var(--bg-secondary);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-input);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.upload-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--input-focus-bg);
}

.upload-btn svg {
  stroke: currentColor;
}

/* ============================================
   Filter Container
   ============================================ */
.filter-container {
  margin-bottom: 8px;
}

.filter-category {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  margin-top: 8px;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.filter-category:first-child {
  margin-top: 0;
}

.filter-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 5px;
  margin-bottom: 4px;
}

.filter-btn {
  padding: 8px 4px;
  font-size: 11.5px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: all 0.15s;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: rgba(52, 152, 219, 0.3);
}

.filter-btn:hover {
  background: var(--input-focus-bg);
  border-color: var(--color-accent);
}

.filter-btn:active {
  transform: scale(0.97);
}

.filter-btn.active {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

/* ============================================
   Sliders
   ============================================ */
.slider-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.slider-row:last-child {
  margin-bottom: 0;
}

.slider-row label {
  width: 55px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  flex-shrink: 0;
}

.slider-row input[type="range"] {
  flex: 1;
  height: 6px;
  background: #ddd;
  border-radius: 3px;
  -webkit-appearance: none;
  cursor: pointer;
}

.black-and-white-photo-generator-container.dark .slider-row input[type="range"] {
  background: #444;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  background: var(--color-accent);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.1s;
}

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

.slider-row input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--color-accent);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
}

.slider-value {
  width: 32px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: right;
  font-family: 'Courier New', monospace;
}

/* ============================================
   Button Group
   ============================================ */
.button-group {
  display: flex;
  gap: 6px;
  margin-top: 10px;
}

.reset-btn {
  flex: 1;
  padding: 8px 10px;
  font-size: 13.5px;
  font-weight: 600;
  background: var(--color-warning);
  color: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.reset-btn:hover {
  filter: brightness(1.05);
  transform: translate(0.5px, 0.5px);
  box-shadow: 1.5px 1.5px 0 rgba(0,0,0,0.15);
}

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

.reset-btn svg {
  stroke: currentColor;
}

/* ============================================
   Preview Area
   ============================================ */
.preview-area {
  flex: 1;
  min-height: 350px;
  background: var(--preview-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-section);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

#photoCanvas {
  max-width: 100%;
  max-height: 100%;
  display: none;
}

#photoCanvas.active {
  display: block;
}

.empty-state {
  text-align: center;
  color: #888;
  padding: 20px;
}

.empty-state svg {
  stroke: #666;
  margin-bottom: 12px;
  opacity: 0.6;
}

.empty-state p {
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
}

.empty-state.hidden {
  display: none;
}

/* ============================================
   Filter Info
   ============================================ */
.filter-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px;
  margin-top: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
}

.filter-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
}

.filter-desc {
  font-size: 12px;
  color: var(--text-secondary);
}

/* ============================================
   Download Button
   ============================================ */
.download-btn {
  width: 100%;
  padding: 12px;
  margin-top: 8px;
  background: var(--color-accent);
  color: #fff;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-button);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: 4px 4px 0 rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

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

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

.download-btn:disabled {
  background: #888;
  cursor: not-allowed;
  box-shadow: none;
  opacity: 0.7;
}

.download-btn svg {
  stroke: currentColor;
}

/* ============================================
   Watermark
   ============================================ */
.watermark {
  text-align: right;
  font-size: 11px;
  color: var(--text-light);
  margin-top: 6px;
  opacity: 0.7;
}

/* ============================================
   Toast Notification
   ============================================ */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  padding: 12px 16px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s;
  z-index: 1000;
  max-width: 280px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-primary);
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast.success {
  border-left: 4px solid var(--color-success);
}

.toast.error {
  border-left: 4px solid var(--color-danger);
}

/* ============================================
   Responsive - Tablet (768px)
   ============================================ */
@media (max-width: 768px) {
  .black-and-white-photo-generator-container {
    margin: 6px 5px;
    padding: 7px;
    width: calc(100% - 10px);
  }

  .main-grid {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .input-section {
    order: 2;
  }

  .result-section {
    order: 1;
    min-height: auto;
  }

  .preview-area {
    min-height: 300px;
  }

  .main-title {
    font-size: 24px;
  }

  .section-header {
    font-size: 15px;
  }

  .dark-mode-toggle {
    font-size: 14px;
    padding: 5px 8px;
  }

  .filter-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ============================================
   Responsive - Mobile (480px)
   ============================================ */
@media (max-width: 480px) {
  .black-and-white-photo-generator-container {
    padding: 6px;
    border-width: 1px;
  }

  .input-section,
  .result-section {
    padding: 6px;
  }

  .main-title {
    font-size: 22px;
  }

  .subtitle {
    font-size: 12.5px;
  }

  .preview-area {
    min-height: 250px;
  }

  .filter-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .filter-btn {
    font-size: 11px;
    padding: 7px 3px;
  }
}