:root {
  /* Basis-Token */
  --primary-h: 220; 
  --primary-s: 70%;
  --primary-l: 50%;

  /* Automatisch berechnete Tokens */
  --color-primary: hsl(var(--primary-h), var(--primary-s), var(--primary-l));
  
  /* Sekundärfarbe = Primär-Hue + 180 Grad */
  --color-secondary: hsl(calc(var(--primary-h) + 180), var(--primary-s), var(--primary-l));

  /* UI Farben (Light Mode Standard) */
  --bg-body: #ffffff;
  --text-main: #1a1a1a;
}

/* Dark Mode Klasse */
body.dark {
  --bg-body: #121212;
  --text-main: #f4f4f4;
  --primary-l: 60%; /* Etwas heller für Dark Mode */
}

/*
GRUNDELEMENTE
*/
body {
  background-color: var(--bg-body);
  color: var(--text-main);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  transition: background-color 0.5s ease, color 0.5s ease;
}
.site-width {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  color: hsl(var(--primary-h), var(--primary-s), calc(var(--primary-l) * 0.8));
  text-decoration: underline;
}

button {
    border: none;
    padding: 10px 20px;
    cursor: pointer;
}

.btn-primary { background: var(--color-primary); color: white; }
.btn-secondary { background: var(--color-secondary); color: white; }

/* 
Hue Slider 
*/
#hue-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 15px;
  border-radius: 8px;
  /* Fixer Verlauf ohne Variablen */
  background: linear-gradient(to right, 
    hsl(0, 100%, 50%), hsl(60, 100%, 50%), hsl(120, 100%, 50%), 
    hsl(180, 100%, 50%), hsl(240, 100%, 50%), hsl(300, 100%, 50%), hsl(360, 100%, 50%));
  outline: none;
}

/* Slider-Knopf für Chrome, Safari, Edge, Opera */
#hue-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--color-primary);
  border: 2px solid #000000;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 2px rgba(0,0,0,0.5);
}

/* Slider-Knopf für Firefox */
#hue-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--color-primary);
  border: 2px solid #000000;
  border-radius: 50%;
  cursor: pointer;
}