/* ============================================
   English Uppercase Converter - CSS
   Neobrutalism Design System
   ============================================ */

/* Global box-sizing */
.english-uppercase-converter-container,
.english-uppercase-converter-container *,
.english-uppercase-converter-container *::before,
.english-uppercase-converter-container *::after {
  box-sizing: border-box;
}

/* ============================================
   CSS Variables - Light Mode (Default)
   ============================================ */
.english-uppercase-converter-container {
  /* Background colors */
  --bg-primary: #f5f5f0;
  --bg-secondary: #fff;
  --bg-section: #fff;
  
  /* Borders */
  --border-color: #333;
  
  /* Text colors */
  --text-primary: #222;
  --text-secondary: #555;
  --text-light: #666;
  
  /* Brand colors */
  --color-accent: #3498db;
  --color-success: #27ae60;
  --color-warning: #f39c12;
  --color-danger: #e74c3c;
  --color-purple: #9b59b6;
  --color-teal: #1abc9c;
  
  /* Chart colors */
  --chart-lowercase: #3498db;
  --chart-uppercase: #27ae60;
  --chart-number: #f39c12;
  --chart-other: #95a5a6;
  
  /* Shadows (neobrutalism) */
  --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);
  
  /* Border radius */
  --radius-container: 8px;
  --radius-section: 6px;
  --radius-button: 4px;
  --radius-input: 4px;
  
  /* Input focus */
  --input-focus-bg: #fffacd;
  
  /* Header title */
  --title-color: #2c3e50;
  --title-shadow: 2px 2px 0 rgba(255,255,255,0.5);
  
  /* Button hover background */
  --btn-hover-overlay: rgba(0,0,0,0.1);
  
  /* Copy button background */
  --copy-btn-bg: #fff;
  --copy-btn-hover-bg: #f0f0f0;
  
  /* Upload area */
  --upload-bg: #fafafa;
  --upload-border: #ccc;
  --upload-hover-bg: #f0f7ff;
}

/* ============================================
   CSS Variables - Dark Mode (Manual toggle)
   ============================================ */
.english-uppercase-converter-container.dark {
  /* Background colors - dark gray tones */
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-section: #2d2d2d;
  
  /* Borders - light gray for contrast */
  --border-color: #e0e0e0;
  
  /* Text colors - light colors for readability */
  --text-primary: #e8e8e8;
  --text-secondary: #b0b0b0;
  --text-light: #909090;
  
  /* Brand colors - adjusted brighter for dark background */
  --color-accent: #5dade2;
  --color-success: #52c77a;
  --color-warning: #f5b041;
  --color-danger: #ec7063;
  --color-purple: #af7ac5;
  --color-teal: #48d1cc;
  
  /* Chart colors - brighter */
  --chart-lowercase: #5dade2;
  --chart-uppercase: #52c77a;
  --chart-number: #f5b041;
  --chart-other: #aab7b8;
  
  /* Shadows - light color (neobrutalism) */
  --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 - slightly bright dark gray */
  --input-focus-bg: #3a3a3a;
  
  /* Header title - bright blue tones */
  --title-color: #7fb3d5;
  --title-shadow: 2px 2px 0 rgba(0,0,0,0.5);
  
  /* Button hover background */
  --btn-hover-overlay: rgba(255,255,255,0.1);
  
  /* Copy button background */
  --copy-btn-bg: #3a3a3a;
  --copy-btn-hover-bg: #4a4a4a;
  
  /* Upload area */
  --upload-bg: #252525;
  --upload-border: #555;
  --upload-hover-bg: #2a3540;
}

/* ============================================
   System Dark Mode Auto Detection
   ============================================ */
@media (prefers-color-scheme: dark) {
  .english-uppercase-converter-container:not(.dark):not(.light) {
    /* Background colors */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-section: #2d2d2d;
    
    /* Borders */
    --border-color: #e0e0e0;
    
    /* Text colors */
    --text-primary: #e8e8e8;
    --text-secondary: #b0b0b0;
    --text-light: #909090;
    
    /* Brand colors */
    --color-accent: #5dade2;
    --color-success: #52c77a;
    --color-warning: #f5b041;
    --color-danger: #ec7063;
    --color-purple: #af7ac5;
    --color-teal: #48d1cc;
    
    /* Chart colors */
    --chart-lowercase: #5dade2;
    --chart-uppercase: #52c77a;
    --chart-number: #f5b041;
    --chart-other: #aab7b8;
    
    /* Shadows */
    --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 */
    --input-focus-bg: #3a3a3a;
    
    /* Header title */
    --title-color: #7fb3d5;
    --title-shadow: 2px 2px 0 rgba(0,0,0,0.5);
    
    /* Button hover background */
    --btn-hover-overlay: rgba(255,255,255,0.1);
    
    /* Copy button background */
    --copy-btn-bg: #3a3a3a;
    --copy-btn-hover-bg: #4a4a4a;
    
    /* Upload area */
    --upload-bg: #252525;
    --upload-border: #555;
    --upload-hover-bg: #2a3540;
  }
}

/* ============================================
   Main Container
   ============================================ */
.english-uppercase-converter-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 Button
   ============================================ */
.dark-mode-toggle {
  position: absolute;
  top: 8px;
  right: 8px;
  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
   ============================================ */
.calculator-header {
  text-align: center;
  margin-bottom: 12px;
  padding: 8px 0;
}

.calculator-header h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--title-color);
  margin: 0 0 6px 0;
  text-shadow: var(--title-shadow);
}

.subtitle {
  font-size: 13.5px;
  color: var(--text-secondary);
  margin: 0;
}

/* ============================================
   Main Grid Layout (2-column)
   ============================================ */
.main-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

/* ============================================
   Sections (Input & Result)
   ============================================ */
.input-section,
.result-section {
  background: var(--bg-section);
  padding: 10px;
  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: 10px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border-color);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

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

/* ============================================
   File Upload Area
   ============================================ */
.upload-area {
  margin-bottom: 10px;
  background: var(--upload-bg);
  border: 2px dashed var(--upload-border);
  border-radius: var(--radius-section);
  transition: all 0.3s ease;
  overflow: hidden;
}

.upload-area.highlight {
  border-color: var(--color-accent);
  background: var(--upload-hover-bg);
  border-style: solid;
}

.file-upload-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 12px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}

.file-upload-label:hover {
  background: var(--upload-hover-bg);
}

.upload-icon {
  stroke: var(--text-secondary);
  transition: stroke 0.2s, transform 0.2s;
}

.file-upload-label:hover .upload-icon {
  stroke: var(--color-accent);
  transform: translateY(-2px);
}

.file-upload-label span {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

.upload-hint {
  font-size: 11px !important;
  color: var(--text-light) !important;
}

/* ============================================
   Input Group
   ============================================ */
.input-group,
.output-group {
  margin-bottom: 10px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.input-group label,
.output-group label {
  display: block;
  margin-bottom: 4px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-primary);
}

.input-group textarea,
.output-group textarea {
  width: 100%;
  flex: 1;
  min-height: 140px;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-input);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 14px;
  font-family: 'Courier New', Consolas, monospace;
  line-height: 1.6;
  resize: vertical;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.input-group textarea:focus,
.output-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--input-focus-bg);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15);
}

.output-group textarea {
  background: var(--bg-primary);
}

/* ============================================
   Options Group
   ============================================ */
.options-group {
  margin-bottom: 10px;
  padding: 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-section);
}

.option-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.option-items {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.option-item {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  user-select: none;
  transition: color 0.2s;
}

.option-item:hover {
  color: var(--text-primary);
}

.option-item input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

/* ============================================
   Buttons
   ============================================ */
.convert-btn {
  width: 100%;
  padding: 12px;
  margin-top: 6px;
  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;
}

.convert-btn:hover {
  filter: brightness(1.05);
  transform: translate(1px, 1px);
  box-shadow: 3px 3px 0 rgba(0,0,0,0.2);
}

.convert-btn:active {
  transform: translate(4px, 4px);
  box-shadow: none;
}

.button-group {
  display: flex;
  gap: 6px;
  margin-top: 6px;
}

.sample-btn,
.reset-btn {
  flex: 1;
  padding: 8px 10px;
  font-size: 13px;
  font-weight: 600;
  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);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.sample-btn {
  background: var(--color-success);
  color: #fff;
}

.reset-btn {
  background: var(--color-warning);
  color: #fff;
}

.sample-btn:hover,
.reset-btn:hover {
  filter: brightness(1.05);
  transform: translate(0.5px, 0.5px);
  box-shadow: 1.5px 1.5px 0 rgba(0,0,0,0.2);
}

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

/* ============================================
   Stats Grid
   ============================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-bottom: 10px;
}

.stat-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-section);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  flex-shrink: 0;
}

.stat-total .stat-icon {
  background: rgba(52, 152, 219, 0.15);
}

.stat-total .stat-icon svg {
  stroke: var(--color-accent);
}

.stat-converted .stat-icon {
  background: rgba(39, 174, 96, 0.15);
}

.stat-converted .stat-icon svg {
  stroke: var(--color-success);
}

.stat-english .stat-icon {
  background: rgba(155, 89, 182, 0.15);
}

.stat-english .stat-icon svg {
  stroke: var(--color-purple);
}

.stat-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.stat-label {
  font-size: 11px;
  color: var(--text-light);
  white-space: nowrap;
}

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

.stat-total .stat-value {
  color: var(--color-accent);
}

.stat-converted .stat-value {
  color: var(--color-success);
}

.stat-english .stat-value {
  color: var(--color-purple);
}

/* ============================================
   Chart Wrapper
   ============================================ */
.chart-wrapper {
  margin-bottom: 10px;
  padding: 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-section);
}

.chart-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  text-align: center;
}

.chart-container {
  height: 120px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.chart-bar-group {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 16px;
  height: 100%;
  width: 100%;
  padding: 0 10px;
}

.chart-bar-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  max-width: 60px;
  height: 100%;
  position: relative;
}

.chart-bar {
  width: 100%;
  min-height: 4px;
  border-radius: 4px 4px 0 0;
  transition: height 0.5s ease-out;
  position: absolute;
  bottom: 40px;
}

.lowercase-bar {
  background: linear-gradient(180deg, var(--chart-lowercase) 0%, rgba(52, 152, 219, 0.7) 100%);
  box-shadow: 0 -2px 8px rgba(52, 152, 219, 0.3);
}

.uppercase-bar {
  background: linear-gradient(180deg, var(--chart-uppercase) 0%, rgba(39, 174, 96, 0.7) 100%);
  box-shadow: 0 -2px 8px rgba(39, 174, 96, 0.3);
}

.number-bar {
  background: linear-gradient(180deg, var(--chart-number) 0%, rgba(243, 156, 18, 0.7) 100%);
  box-shadow: 0 -2px 8px rgba(243, 156, 18, 0.3);
}

.other-bar {
  background: linear-gradient(180deg, var(--chart-other) 0%, rgba(149, 165, 166, 0.7) 100%);
  box-shadow: 0 -2px 8px rgba(149, 165, 166, 0.3);
}

.chart-bar-label {
  position: absolute;
  bottom: 20px;
  font-size: 11px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.chart-bar-value {
  position: absolute;
  bottom: 4px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
}

/* ============================================
   Action Buttons (Copy, Download)
   ============================================ */
.action-buttons {
  display: flex;
  gap: 6px;
  margin-top: auto;
}

.copy-btn,
.download-btn {
  flex: 1;
  padding: 10px 12px;
  font-size: 13px;
  font-weight: 600;
  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;
}

.copy-btn {
  background: var(--color-accent);
  color: #fff;
}

.download-btn {
  background: var(--color-teal);
  color: #fff;
}

.copy-btn:hover,
.download-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);
}

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

/* ============================================
   Toast Notification
   ============================================ */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-section);
  padding: 12px 16px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s;
  z-index: 1000;
  max-width: 300px;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.toast svg {
  stroke: var(--color-success);
  flex-shrink: 0;
}

.toast-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toast-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-primary);
}

.toast-value {
  font-size: 12px;
  color: var(--text-secondary);
  font-family: 'Courier New', monospace;
  word-break: break-all;
}

/* ============================================
   Responsive - Tablet (768px or less)
   ============================================ */
@media (max-width: 768px) {
  .english-uppercase-converter-container {
    margin: 6px 5px;
    padding: 7px;
    width: calc(100% - 10px);
  }

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

  .calculator-header h2 {
    font-size: 24px;
  }

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

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

  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
  }

  .stat-card {
    flex-direction: column;
    text-align: center;
    padding: 8px 4px;
    gap: 4px;
  }

  .stat-icon {
    width: 32px;
    height: 32px;
  }

  .stat-label {
    font-size: 10px;
  }

  .stat-value {
    font-size: 16px;
  }

  .chart-bar-group {
    gap: 12px;
  }
}

/* ============================================
   Responsive - Mobile (480px or less)
   ============================================ */
@media (max-width: 480px) {
  .english-uppercase-converter-container {
    padding: 6px;
    border-width: 1px;
  }

  .input-section,
  .result-section {
    padding: 8px;
  }

  .calculator-header h2 {
    font-size: 22px;
  }

  .subtitle {
    font-size: 12.5px;
  }

  .option-items {
    flex-direction: column;
    gap: 8px;
  }

  .button-group {
    flex-direction: column;
  }

  .action-buttons {
    flex-direction: column;
  }

  .chart-container {
    height: 100px;
  }

  .chart-bar-group {
    gap: 8px;
  }

  .chart-bar-label {
    font-size: 10px;
  }

  .toast {
    left: 10px;
    right: 10px;
    bottom: 10px;
    max-width: none;
  }
}