/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: sans-serif;
}
body {
  background: var(--bg-page);
  color: var(--fg-text);
}

/* CSS Variables for Theming */
:root {
  /* Dark-theme defaults */
  --bg-page:       #111;
  --fg-text:       #eee;
  --panel-bg:      rgba(30,30,40,0.8);
  --accent:        #ffcc00;
  --accent-hover:  #ffd633;
  --spacing-sm:    8px;
  --spacing-md:    16px;
  --radius:        6px;
  --font-base:     'Segoe UI', Roboto, sans-serif;
}

body[data-theme="light"] {
  /* Light-theme overrides */
  --bg-page:       #f5f5f5;
  --fg-text:       #222;
  --panel-bg:      rgba(245,245,245,0.9);
  --accent:        #0066cc;
  --accent-hover:  #005bb5;
}

/* Canvas */
#webgl-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* Controls Panel */
#controls {
  position: absolute;
  top: var(--spacing-md);
  left: var(--spacing-md);
  z-index: 10;
  background: var(--panel-bg);
  padding: var(--spacing-md);
  border-radius: calc(var(--radius) * 1.5);
  color: var(--fg-text);
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  width: 220px;
}

/* Consolidated form-reset */
.my-control,
#controls select#planet-select,
#controls input[type="range"] {
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
}

/* Dropdown */
#controls select#planet-select {
  background: var(--panel-bg)
              url('data:image/svg+xml;utf8,<svg fill="%23eee" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/></svg>')
              no-repeat right var(--spacing-md) center;
  background-size: 16px;
  border: 1px solid #555;
  border-radius: var(--radius);
  padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) var(--spacing-sm);
  font-size: 1rem;
  color: var(--fg-text);
  cursor: pointer;
}

/* Slider container */
#controls #slider-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

/* Slider label */
#controls #slider-container label {
  font-size: 0.9rem;
  color: #ccc;
}

/* Range input track */
#controls #slider-container input[type="range"] {
  width: 100%;
  height: 6px;
  background: #444;
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

/* Slider thumb */
#controls #slider-container input[type="range"]::-webkit-slider-thumb,
#controls #slider-container input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--accent);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 4px rgba(0,0,0,0.5);
}

/* Tooltip */
#tooltip {
  position: absolute;
  display: none;
  pointer-events: none;
  background: rgba(0, 0, 0, 0.75);
  color: #fff;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  font-size: 0.8rem;
  white-space: nowrap;
  transform: translate(10px, 10px);
  z-index: 100;
}

/* Global Speed Controls */
#global-speed-controls {
  position: absolute;
  bottom: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--spacing-md);
  z-index: 10;
}

#global-speed-controls button {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  border: none;
  background: var(--panel-bg);
  color: var(--fg-text);
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.2s ease;
}

#global-speed-controls button:hover {
  background: var(--accent-hover);
  color: var(--fg-text-hover, #000);
}

/* Theme Switch Container */
.theme-switch {
  position: absolute;
  top: 10px;
  right: 10px;
  display: inline-block;
  width: 50px;
  height: 28px;
  z-index: 20;
}

/* Hide default checkbox */
.theme-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

/* The slider track */
.theme-switch .slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0;
  right: 0; bottom: 0;
  background: var(--panel-bg);
  border-radius: 34px;
  transition: background 0.3s ease;
}

/* The knob */
.theme-switch .slider::before {
  position: absolute;
  content: "";
  height: 22px;
  width: 22px;
  left: 3px;
  bottom: 3px;
  background: var(--fg-text);
  border-radius: 50%;
  transition: transform 0.3s ease, background 0.3s ease;
}

/* Checked state */
.theme-switch input:checked + .slider {
  background: var(--accent);
}
.theme-switch input:checked + .slider::before {
  transform: translateX(22px);
  background: var(--bg-page);
}