/* CSS Variables - Standardized System */
.dpi-calculator-container {
  /* 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;
  --color-teal: #1abc9c;
  
  --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;
  --title-color: #2c3e50;
  --copy-btn-bg: #fff;
  --copy-btn-hover-bg: #f0f0f0;
}

/* Dark Mode Manual */
.dpi-calculator-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;
  --color-teal: #48d1cc;
  
  --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;
  --title-color: #7fb3d5;
  --copy-btn-bg: #3a3a3a;
  --copy-btn-hover-bg: #4a4a4a;
}

/* System Dark Mode Auto-detect */
@media (prefers-color-scheme: dark) {
  .dpi-calculator-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;
    --color-teal: #48d1cc;
    --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;
    --title-color: #7fb3d5;
    --copy-btn-bg: #3a3a3a;
    --copy-btn-hover-bg: #4a4a4a;
  }
}

/* Layout & Box Sizing */
.dpi-calculator-container,
.dpi-calculator-container * {
  box-sizing: border-box;
}

.dpi-calculator-container {
  position: relative;
  max-width: 900px;
  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;
}

/* Header */
.header {
  margin-bottom: 12px;
  padding-right: 50px;
}

.main-title {
  font-size: 24px;
  font-weight: 800;
  color: var(--title-color);
  margin: 0 0 6px 0;
  letter-spacing: -0.5px;
  text-shadow: 1px 1px 0 rgba(0,0,0,0.05);
}

.subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin: 0;
}

/* Dark Mode Toggle - Requested 8px Radius */
.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; /* ⭐ 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);
}

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

/* Section Styles */
.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);
}

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

/* Input Components */
.input-group { margin-bottom: 8px; }

.input-group label {
  display: block;
  margin-bottom: 4px;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
}

.input-group input,
.input-group select {
  width: 100%;
  padding: 7px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-input);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 18px;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.input-group input:focus,
.input-group select:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--input-focus-bg);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.1);
}

.numeric-input {
  font-family: 'Courier New', monospace;
  font-weight: 700;
}

/* Mode Selector */
.mode-selector { display: flex; gap: 4px; }

.mode-btn {
  flex: 1;
  padding: 6px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  font-size: 15px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s;
}

.mode-btn.active {
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
  border-color: var(--border-color);
  box-shadow: inset 2px 2px 0 rgba(0,0,0,0.1);
}

/* Input Helpers */
.input-with-select { display: flex; gap: 4px; }
.input-with-select input { flex: 2; }
.input-with-select select { flex: 1.5; font-size: 15px; }

.preset-container { margin-bottom: 6px; }
.preset-container select { font-size: 15px; color: var(--text-secondary); }

.dual-input { display: flex; gap: 6px; }
.sub-input { flex: 1; }

.unit-label {
  display: block;
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 2px;
}

.input-description {
  margin-top: 4px;
  font-size: 14.5px;
  color: var(--text-light);
}

/* Buttons */
.calculate-btn {
  width: 100%;
  padding: 8px 16px;
  margin-top: 8px;
  background: var(--color-accent);
  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);
}

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

.calculate-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: 6px 12px;
  font-size: 16px;
  font-weight: 500;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  cursor: pointer;
  box-shadow: 2px 2px 0 rgba(0,0,0,0.2);
}

.sample-btn { background: var(--color-success); color: #fff; }
.reset-btn { background: var(--color-warning); color: #fff; }
.sample-btn:hover, .reset-btn:hover { transform: translate(0.5px, 0.5px); }
.sample-btn:active, .reset-btn:active { transform: translate(2px, 2px); box-shadow: none; }

/* Results */
.quality-badge-container {
  text-align: right;
  margin-bottom: 4px;
}

.quality-badge {
  display: inline-block;
  padding: 4px 8px;
  font-size: 13px;
  font-weight: 700;
  border-radius: 4px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-light);
}

.result-item {
  padding: 8px;
  margin-bottom: 6px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  box-shadow: var(--shadow-sm);
}

.result-label {
  display: block;
  margin-bottom: 4px;
  font-size: 15.5px;
  color: var(--text-secondary);
}

.value-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.result-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
  letter-spacing: -0.5px;
}

.result-value.highlight {
  font-size: 26px;
  color: var(--color-accent);
}

/* Details Grid */
.details-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 6px;
}

.result-item.small {
  margin-bottom: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.result-value.small {
  font-size: 18px;
  color: var(--text-primary);
}

.detail-desc {
  font-size: 12.5px;
  color: var(--text-light);
  margin-top: 2px;
}

/* Recommendation Box */
.recommendation-box {
  padding: 8px;
  background: var(--input-focus-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  margin-bottom: 6px;
  font-size: 14.5px;
}

.rec-label { font-weight: 600; color: var(--text-secondary); margin-right: 4px; }
.rec-value { font-weight: 700; color: var(--color-accent); }

/* Copy Button */
.copy-btn {
  padding: 4px 8px;
  background: var(--copy-btn-bg);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  font-size: 14.5px;
  cursor: pointer;
  transition: all 0.2s;
}
.copy-btn:hover { background: var(--copy-btn-hover-bg); transform: translateY(-1px); }

/* Info Box */
.info-box {
  background: var(--bg-primary);
  padding: 8px;
  border-radius: var(--radius-button);
  border: 1px dashed var(--border-color);
  margin-top: 8px;
}
.info-text { margin: 0; font-size: 14.5px; color: var(--text-secondary); line-height: 1.4; }

/* Save Image Button */
.save-image-btn {
  width: 100%;
  padding: 8px;
  margin-top: 8px;
  background: var(--color-purple);
  color: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 2px 2px 0 rgba(0,0,0,0.2);
}
.save-image-btn:hover { filter: brightness(1.05); transform: translate(0.5px, 0.5px); }
.save-image-btn.capturing { display: none; }

/* Watermark */
.watermark {
  position: absolute;
  bottom: 10px;
  right: 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-light);
  opacity: 0.6;
  pointer-events: none;
}

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

/* Responsive */
@media (max-width: 768px) {
  .dpi-calculator-container {
    margin: 6px 5px;
    padding: 7px;
    width: calc(100% - 10px);
  }
  .main-grid { grid-template-columns: 1fr; gap: 6px; }
  .details-grid { grid-template-columns: 1fr; }
  .section-header { font-size: 16px; }
  .main-title { font-size: 22px; }
  .calculate-btn { font-size: 17px; }
}