:root {
  --bg: #f9f9f9;
  --fg: #333333;
  --card-bg: rgba(255, 255, 255, 0.85);
  --accent: #1f6feb; /* hoofdaccentkleur */
  --accent-hover: #1e5fd6; /* iets donkerder blauw */
  --shadow: 0 4px 12px rgba(0,0,0,0.1);
  --transition: 0.25s ease;
}

[data-theme="dark"] {
  --bg: #1e1e1e;
  --fg: #eeeeee;
  --card-bg: rgba(30, 30, 30, 0.9);
  --accent: #4c8dff;
  --accent-hover: #3a7aff;
  --shadow: 0 4px 12px rgba(0,0,0,0.5);
}

body {
  background-color: var(--bg);
  color: var(--fg);
  font-family: 'Inter', sans-serif;
  margin: 0;
  padding: 0;
  transition: background-color var(--transition), color var(--transition);
}

.container {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background: var(--card-bg);
  box-shadow: var(--shadow);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

button,
.btn {
  background-color: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.8rem 1.4rem;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

button:hover,
.btn:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(31, 111, 235, 0.25);
  color: #fff;
}

button:focus-visible,
.btn:focus-visible {
  outline: 3px solid rgba(31, 111, 235, 0.4);
  outline-offset: 2px;
}

/* Thema toggleknop */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background: var(--card-bg);
  border: none;
  padding: 0.5rem;
  border-radius: 50%;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: background-color var(--transition), transform var(--transition);
}
.theme-toggle:hover {
  transform: rotate(15deg);
}

/* Formuliervelden */
input,
select,
textarea {
  width: 100%;
  padding: 0.6rem;
  margin-top: 0.3rem;
  margin-bottom: 0.8rem;
  border: 1px solid #ccc;
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--fg);
  transition: border-color var(--transition), box-shadow var(--transition);
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.15);
}

/* Form field groups */
.field-group {
  border: 0;
  padding: 0;
  margin: 0 0 0.8rem 0;
}
.field-group > legend {
  display: block;
  margin: 0 0 0.35rem 0;
  font-weight: 600;
  color: var(--fg);
}

/* Radios netjes uitlijnen */
.radio-group {
  display: grid;
  grid-template-columns: 1fr;
  gap: .4rem;
  margin-bottom: .6rem;
}

.radio-item {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  line-height: 1.3;
  cursor: pointer;
  user-select: none;
}

.radio-item input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent); /* moderne browsers: kleurtje van de radio */
}

/* Desktop: zet ze naast elkaar */
@media (min-width: 640px) {
  .radio-group {
    grid-template-columns: repeat(3, auto);
    gap: 0.75rem 1.25rem;
  }
}