/* Exercice 6 - Variables CSS & Thèmes */

/* Thème clair */
:root {
  --color-bg: #f9f9f9;
  --color-surface: #ffffff;
  --color-primary: #3498db;
  --color-primary-dark: #2980b9;
  --color-text: #2c3e50;
  --color-text-muted: #666;
  --color-border: #ddd;
  --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* Thème sombre - activé via #themeSwitch:checked sans JavaScript */
#themeSwitch:checked ~ * {
  --color-bg: #1a1a2e;
  --color-surface: #16213e;
  --color-primary: #4fc3f7;
  --color-primary-dark: #0288d1;
  --color-text: #e0e0e0;
  --color-text-muted: #aaa;
  --color-border: #333;
  --shadow: 0 2px 8px rgba(0,0,0,0.4);
}

#themeSwitch:checked ~ body {
  background: #1a1a2e;
  color: #e0e0e0;
}

* {
  box-sizing: border-box;
  transition: background 0.3s, color 0.3s;
}

body {
  font-family: Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  max-width: 700px;
  margin: 30px auto;
  padding: 0 20px;
}

a.back { color: var(--color-primary); }
h1 { color: var(--color-text); }
h2 { color: var(--color-primary); border-bottom: 2px solid var(--color-primary); padding-bottom: 5px; }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 20px;
  margin: 15px 0;
  box-shadow: var(--shadow);
}
.card p { color: var(--color-text-muted); }

.btn {
  background: var(--color-primary);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
}
.btn:hover { background: var(--color-primary-dark); }

/* Cacher la checkbox */
.theme-input { display: none; }

/* Toggle switch */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}
.switch {
  position: relative;
  width: 50px;
  height: 26px;
  cursor: pointer;
}
.slider {
  position: absolute;
  inset: 0;
  background: #ccc;
  border-radius: 26px;
  cursor: pointer;
  transition: background 0.3s;
}
.slider::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  left: 3px;
  top: 3px;
  background: white;
  border-radius: 50%;
  transition: transform 0.3s;
}
#themeSwitch:checked ~ * .slider { background: var(--color-primary); }
#themeSwitch:checked ~ * .slider::before { transform: translateX(24px); }