/* Theme Variables - adapted from thought-eddies */
:root {
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Light theme colors */
  --color-bg-light: #f4f1e4;
  --color-bg-code-light: #e8e5d8;
  --color-bg-card-light: #ebe8db;
  --color-ink-light: #2d3436;
  --color-ink-secondary-light: #636e72;
  --color-accent-light: #0984e3;
  --color-accent-secondary-light: #6c5ce7;
  --color-border-light: #b4b4b4;
  --color-highlight-light: color-mix(in srgb, var(--color-accent-light) 50%, transparent);

  /* Dark theme colors */
  --color-bg-dark: #1c1b17;
  --color-bg-code-dark: #2a2925;
  --color-bg-card-dark: #252420;
  --color-ink-dark: #cccccc;
  --color-ink-secondary-dark: #a8a8a8;
  --color-accent-dark: #4dabf7;
  --color-accent-secondary-dark: #a29bfe;
  --color-border-dark: #4a4a4a;
  --color-highlight-dark: color-mix(in srgb, var(--color-accent-dark) 50%, transparent);

  /* Active theme colors - light by default */
  --color-bg: var(--color-bg-light);
  --color-bg-code: var(--color-bg-code-light);
  --color-bg-card: var(--color-bg-card-light);
  --color-ink: var(--color-ink-light);
  --color-ink-secondary: var(--color-ink-secondary-light);
  --color-accent: var(--color-accent-light);
  --color-accent-secondary: var(--color-accent-secondary-light);
  --color-border: var(--color-border-light);
  --color-highlight: var(--color-highlight-light);

  /* Status colors */
  --color-success: #00b894;
  --color-warning: #fdcb6e;
  --color-danger: #e17055;

  /* Typography */
  --font-primary: 'Inter', 'Helvetica Neue', 'Arial', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* Light theme class override */
:root.light {
  --color-bg: var(--color-bg-light);
  --color-bg-code: var(--color-bg-code-light);
  --color-bg-card: var(--color-bg-card-light);
  --color-ink: var(--color-ink-light);
  --color-ink-secondary: var(--color-ink-secondary-light);
  --color-accent: var(--color-accent-light);
  --color-accent-secondary: var(--color-accent-secondary-light);
  --color-border: var(--color-border-light);
  --color-highlight: var(--color-highlight-light);
}

/* Dark theme class override */
:root.dark {
  --color-bg: var(--color-bg-dark);
  --color-bg-code: var(--color-bg-code-dark);
  --color-bg-card: var(--color-bg-card-dark);
  --color-ink: var(--color-ink-dark);
  --color-ink-secondary: var(--color-ink-secondary-dark);
  --color-accent: var(--color-accent-dark);
  --color-accent-secondary: var(--color-accent-secondary-dark);
  --color-border: var(--color-border-dark);
  --color-highlight: var(--color-highlight-dark);
}

/* Reset & Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  transition: color 300ms, background-color 300ms;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-ink);
  line-height: 1.6;
  min-height: 100vh;
  background-image: radial-gradient(
    color-mix(in srgb, var(--color-border) 60%, transparent) 1px,
    transparent 1px
  );
  background-size: 20px 20px;
  transition: color 300ms, background-color 300ms;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  line-height: 1.4;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-ink);
}

h1 {
  font-size: var(--text-4xl);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

h2 {
  font-size: var(--text-3xl);
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

p {
  font-size: var(--text-base);
  color: var(--color-ink);
  margin-bottom: var(--spacing-md);
}

/* Links */
a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Header */
header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg) 0;
}

header h1 {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--color-ink-secondary);
  font-size: var(--text-lg);
  font-weight: 400;
}

/* Main Layout */
main {
  display: grid;
  gap: var(--spacing-lg);
}

/* Cards and Panels */
.card,
.control-group,
.chart-container {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
}

/* Control Panels */
.controls-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.control-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.control-header label {
  font-weight: 500;
  color: var(--color-ink-secondary);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Value Display */
.value-display {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.value-display .value {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: 500;
  color: var(--color-accent);
}

.value-display .unit {
  font-size: var(--text-base);
  color: var(--color-ink-secondary);
}

.value-display .secondary-value {
  font-size: var(--text-sm);
  color: var(--color-ink-secondary);
  margin-left: var(--spacing-xs);
}

/* Sliders */
.slider-container {
  margin-bottom: var(--spacing-md);
}

input[type="range"] {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--color-bg-code);
  appearance: none;
  cursor: pointer;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: grab;
  box-shadow: 0 2px 8px color-mix(in srgb, var(--color-accent) 40%, transparent);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 2px 16px color-mix(in srgb, var(--color-accent) 60%, transparent);
}

input[type="range"]::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(0.95);
}

input[type="range"]::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: grab;
  border: none;
  box-shadow: 0 2px 8px color-mix(in srgb, var(--color-accent) 40%, transparent);
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: var(--spacing-xs);
  font-size: var(--text-xs);
  color: var(--color-ink-secondary);
}

/* Buttons */
.btn,
.btn-adjust {
  padding: 0.625rem 1rem;
  background: var(--color-bg-code);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-base);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:hover,
.btn-adjust:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
}

.control-buttons {
  display: flex;
  gap: var(--spacing-xs);
}

.control-buttons .btn-adjust {
  flex: 1;
}

/* Result Panel */
.result-panel {
  background: linear-gradient(135deg, var(--color-bg-card) 0%, color-mix(in srgb, var(--color-accent) 5%, var(--color-bg-card)) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  align-items: center;
}

/* Large Value Display */
.dew-point-display {
  text-align: center;
}

.dew-point-label {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-ink-secondary);
  margin-bottom: var(--spacing-xs);
}

.dew-point-value {
  font-family: var(--font-mono);
  font-size: 4rem;
  font-weight: 500;
  color: var(--color-accent);
  line-height: 1;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.25rem;
}

.dew-unit {
  font-size: var(--text-2xl);
  color: var(--color-ink-secondary);
}

.dew-point-secondary {
  font-size: var(--text-lg);
  color: var(--color-ink-secondary);
  margin-top: var(--spacing-xs);
}

/* Comfort Indicator */
.comfort-indicator {
  padding: var(--spacing-md);
}

.comfort-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-ink-secondary);
  margin-bottom: var(--spacing-sm);
}

.comfort-bar {
  position: relative;
  height: 12px;
  background: linear-gradient(90deg,
    #3b82f6 0%,
    #22c55e 25%,
    #eab308 50%,
    #f97316 75%,
    #ef4444 100%
  );
  border-radius: 6px;
  margin-bottom: var(--spacing-xs);
}

.comfort-zones {
  display: flex;
  justify-content: space-between;
  padding-top: var(--spacing-md);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.zone {
  color: var(--color-ink-secondary);
}

.comfort-marker {
  position: absolute;
  top: -4px;
  width: 20px;
  height: 20px;
  background: var(--color-ink);
  border: 3px solid var(--color-bg);
  border-radius: 50%;
  transform: translateX(-50%);
  transition: left 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.comfort-text {
  text-align: center;
  font-weight: 500;
  font-size: var(--text-base);
  margin-top: var(--spacing-md);
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-bg-code);
  border-radius: var(--radius-sm);
}

.comfort-text.dry { color: #3b82f6; }
.comfort-text.comfortable { color: #22c55e; }
.comfort-text.humid { color: #eab308; }
.comfort-text.very-humid { color: #f97316; }
.comfort-text.oppressive { color: #ef4444; }

/* Spread Display */
.spread-display {
  padding: var(--spacing-md);
  background: var(--color-bg-code);
  border-radius: var(--radius-md);
}

.spread-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.spread-label {
  font-size: var(--text-sm);
  color: var(--color-ink-secondary);
}

.spread-value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  color: var(--color-accent-secondary);
}

.spread-description {
  font-size: var(--text-sm);
  color: var(--color-ink-secondary);
  line-height: 1.5;
}

/* Visualization Panel */
.visualization-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
}

.chart-container h3 {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-secondary);
  margin-bottom: var(--spacing-md);
  text-align: center;
}

canvas {
  width: 100% !important;
  height: 250px !important;
}

/* Explanation Panel */
.explanation-panel {
  margin-top: var(--spacing-lg);
}

.explanation-panel h2 {
  font-size: var(--text-3xl);
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  color: var(--color-ink);
}

.explanation-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.card h4 {
  font-size: var(--text-base);
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  color: var(--color-accent);
}

.card p {
  font-size: var(--text-sm);
  color: var(--color-ink-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

.card-icon {
  font-size: var(--text-3xl);
  margin-bottom: var(--spacing-sm);
}

/* Formula Box */
.formula-box {
  background: var(--color-bg-code);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
}

.formula-box h4 {
  font-size: var(--text-base);
  margin-bottom: var(--spacing-sm);
  color: var(--color-ink);
}

.formula-box p {
  color: var(--color-ink-secondary);
  font-size: var(--text-sm);
  margin-bottom: var(--spacing-sm);
}

.formula-box code {
  display: block;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: var(--spacing-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  line-height: 1.8;
  margin-bottom: var(--spacing-sm);
}

.formula-note {
  font-size: var(--text-xs);
  color: var(--color-ink-secondary);
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: calc(var(--text-base) * 0.9);
}

code.inline-code {
  background: var(--color-bg-code);
  padding: 0.2em 0.4em;
  border-radius: 3px;
}

/* Footer */
footer {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg) 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

footer p {
  color: var(--color-ink-secondary);
  font-size: var(--text-sm);
  margin-bottom: 0;
}

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-xs) var(--spacing-sm);
  cursor: pointer;
  font-size: var(--text-lg);
  z-index: 100;
}

.theme-toggle:hover {
  background: var(--color-bg-code);
}

/* Navigation */
.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
  margin-bottom: var(--spacing-md);
}

.site-nav a {
  font-weight: 600;
  color: var(--color-ink);
}

.site-nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* Tools List */
.tools-list {
  list-style: none;
  padding: 0;
}

.tools-list li {
  margin-bottom: var(--spacing-md);
}

.tools-list a {
  display: block;
  padding: var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.tools-list a:hover {
  text-decoration: none;
}

.tools-list h3 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-xs);
}

.tools-list p {
  color: var(--color-ink-secondary);
  font-size: var(--text-sm);
  margin-bottom: 0;
}

/* Mobile Styles */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-md);
  }

  h1 {
    font-size: var(--text-3xl);
  }

  .dew-point-value {
    font-size: 3rem;
  }

  .visualization-panel {
    grid-template-columns: 1fr;
  }

  .chart-container {
    min-width: 0;
  }

  canvas {
    height: 200px !important;
  }

  .theme-toggle {
    top: var(--spacing-xs);
    right: var(--spacing-xs);
  }
}