/* Namespace styling to prevent conflicts */
.vitamin-d-calculator-container {
  /* =========================================
     CSS Variables (Light Mode Default)
     ========================================= */
  --bg-primary: #f5f5f0;
  --bg-secondary: #fff;
  --bg-section: #fff;
  --border-color: #333;
  
  --text-primary: #222;
  --text-secondary: #555;
  --text-light: #666;
  
  --color-accent: #3498db;     /* Blue */
  --color-success: #27ae60;    /* Green */
  --color-warning: #f39c12;    /* Orange */
  --color-danger: #e74c3c;     /* Red */
  --color-purple: #9b59b6;     /* Purple */
  
  --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;

  /* Global box-sizing within container */
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Malgun Gothic', sans-serif;
  line-height: 1.5;
  
  /* ⭐ Important for native inputs in dark mode */
  color-scheme: light dark;
  
  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);
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
}

.vitamin-d-calculator-container *,
.vitamin-d-calculator-container *::before,
.vitamin-d-calculator-container *::after {
  box-sizing: border-box;
}

/* =========================================
   Dark Mode Variables
   ========================================= */
.vitamin-d-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;     /* Brighter Blue */
  --color-success: #52c77a;    /* Brighter Green */
  --color-warning: #f5b041;    /* Brighter Orange */
  --color-danger: #ec7063;     /* Brighter Red */
  --color-purple: #af7ac5;     /* Brighter Purple */
  
  --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;
}

/* System dark mode detection */
@media (prefers-color-scheme: dark) {
  .vitamin-d-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;
    --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;
  }
}

/* =========================================
   Layout & Components
   ========================================= */

/* Header */
.vitamin-d-calculator-container .header {
  margin-bottom: 12px;
  padding-right: 40px;
}

.vitamin-d-calculator-container .main-title {
  font-size: 28px;
  font-weight: 800;
  margin: 0 0 4px 0;
  color: var(--text-primary);
}

.vitamin-d-calculator-container .subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  margin: 0;
}

/* Dark Mode Toggle - Radius 8px applied */
.vitamin-d-calculator-container .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; /* ⭐ Request: 8px radius */
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 2px 2px 0 rgba(0,0,0,0.15);
  font-size: 17.5px;
  color: var(--text-primary);
  z-index: 10;
}

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

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

/* 2-Column Grid Layout */
.vitamin-d-calculator-container .main-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

/* Sections */
.vitamin-d-calculator-container .input-section,
.vitamin-d-calculator-container .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;
}

.vitamin-d-calculator-container .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);
}

.vitamin-d-calculator-container .section-header svg {
  stroke: var(--color-accent);
}

/* Input Fields */
.vitamin-d-calculator-container .input-group {
  margin-bottom: 8px;
}

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

.vitamin-d-calculator-container input,
.vitamin-d-calculator-container 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;
  font-family: inherit;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

/* ⭐ Placeholder Styling for visibility in both modes */
.vitamin-d-calculator-container input::placeholder {
  color: var(--text-light);
  opacity: 0.7;
}

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

.vitamin-d-calculator-container input:focus,
.vitamin-d-calculator-container 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);
}

.vitamin-d-calculator-container .input-description {
  margin-top: 4px;
  margin-bottom: 0;
  font-size: 14.5px;
  color: var(--text-light);
}

/* Buttons */
.vitamin-d-calculator-container .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);
}

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

.vitamin-d-calculator-container .calculate-btn:active {
  transform: translate(4px, 4px);
  box-shadow: none;
}

.vitamin-d-calculator-container .button-group {
  display: flex;
  gap: 6px;
  margin-top: 6px;
}

.vitamin-d-calculator-container .sample-btn,
.vitamin-d-calculator-container .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;
  transition: all 0.15s;
  box-shadow: 2px 2px 0 rgba(0,0,0,0.2);
}

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

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

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

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

/* Result Items */
.vitamin-d-calculator-container .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);
}

.vitamin-d-calculator-container .result-label {
  display: block;
  margin-bottom: 4px;
  font-size: 15.5px;
  font-weight: 500;
  color: var(--text-secondary);
}

.vitamin-d-calculator-container .result-value {
  display: block;
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
}

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

/* Info Box (Food Suggestion) */
.vitamin-d-calculator-container .info-box {
  margin-top: 12px;
  padding: 8px;
  background: var(--input-focus-bg); /* Use focus bg which is visible in dark mode */
  border-radius: 4px;
  border: 1px dashed var(--border-color);
}

.vitamin-d-calculator-container .info-title {
  font-weight: 600;
  font-size: 15px;
  display: block;
  margin-bottom: 4px;
  color: var(--text-primary); /* ⭐ Explicit color */
}

.vitamin-d-calculator-container .info-list {
  margin: 0;
  padding-left: 20px;
  font-size: 14.5px;
  color: var(--text-secondary); /* ⭐ Explicit color */
}

/* Save Image Button */
.vitamin-d-calculator-container .save-image-btn {
  width: 100%;
  padding: 8px 16px;
  margin-top: auto;
  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;
  transition: all 0.15s;
  box-shadow: 2px 2px 0 rgba(0,0,0,0.2);
}

.vitamin-d-calculator-container .save-image-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);
}

.vitamin-d-calculator-container .save-image-btn:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

.vitamin-d-calculator-container .save-image-btn.capturing {
  display: none;
}

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

.vitamin-d-calculator-container.capturing .watermark {
  display: block;
}

/* Toast */
.vitamin-d-calculator-container .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;
}

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

.vitamin-d-calculator-container .toast.success { background: var(--color-success); color: #fff; }
.vitamin-d-calculator-container .toast.error { background: var(--color-danger); color: #fff; }
.vitamin-d-calculator-container .toast.info { background: var(--color-accent); color: #fff; }

/* Responsive adjustments */
@media (max-width: 768px) {
  .vitamin-d-calculator-container {
    margin: 6px 5px;
    padding: 7px;
    width: calc(100% - 10px);
  }
  
  .vitamin-d-calculator-container .main-grid {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  
  .vitamin-d-calculator-container .main-title { font-size: 24px; }
  .vitamin-d-calculator-container .save-image-btn { margin-top: 8px; }
}