/* assets/css/kepler-laws.css */

:root {
  --font: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  --mono: Menlo, Consolas, ui-monospace, SFMono-Regular, Monaco, "Courier New", monospace;
  --fg: #222;
  --muted: #555;
  --bg: #fafafa;
  --accent: #2f6feb;
  --border: #ddd;
  --canvas-bg: #0f0f1a;
  --sun-color: #ffdb4d;
  --planet-color: #4db8ff;
}

* {
  box-sizing: border-box;
}

.kepler-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px;
  font-family: var(--font);
  color: var(--fg);
  background: #fff;
}

.kepler-container h2 {
  margin: 0 0 8px;
}

.kepler-container .intro {
  color: var(--muted);
  margin: 8px 0 16px;
}

/* Canvas Wrapper */
.canvas-wrap {
  width: 100%;
  background: var(--canvas-bg);
  border-radius: 8px;
  padding: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

canvas {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  cursor: crosshair;
}

.legend {
  margin-top: 10px;
  font-size: 13px;
  color: #aaa;
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  justify-content: center;
}

.legend .dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 4px;
}

.legend .sun { background-color: var(--sun-color); box-shadow: 0 0 5px var(--sun-color); }
.legend .planet { background-color: var(--planet-color); }
.legend .empty-focus { background-color: #444; border: 1px dashed #666; }
.legend .area-swath { background-color: rgba(255, 77, 77, 0.6); border-radius: 2px; }

/* Controls */
.controls {
  background: var(--bg);
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 16px;
}

.controls .row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.controls .row:last-child {
  margin-bottom: 0;
}

label {
  font-weight: 500;
  min-width: 140px;
}

input[type="range"] {
  flex: 1;
  max-width: 300px;
  cursor: pointer;
}

/* Buttons */
.btn {
  background-color: var(--accent);
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s;
}

.btn:hover {
  background-color: #1e5ad1;
}

.btn.secondary {
  background-color: #e0e0e0;
  color: #333;
}

.btn.secondary:hover {
  background-color: #d0d0d0;
}

/* Physics Note */
.physics-note {
  background: #f9f9f9;
  border-left: 4px solid var(--accent);
  padding: 12px 16px;
  border-radius: 0 4px 4px 0;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.5;
}

.physics-note h4 {
  margin: 0 0 6px 0;
  color: var(--fg);
}

/* Mobile */
@media (max-width: 600px) {
  .controls .row {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  input[type="range"] {
    width: 100%;
    max-width: none;
  }
}