:root {
  /* Kleuren */
  --bg-body: #f0f4f8;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --surface-3: #f1f5f9;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;

  /* Accent */
  --accent: #1e6eb5;
  --accent-hover: #1a5e9a;
  --accent-dark: #155090;
  --accent-light: #e8f1fb;
  --accent-2: #e8640a;
  --accent-2-light: #fef0e6;

  /* Semantische kleuren */
  --success: #10b981;
  --success-light: #ecfdf5;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --danger: #ef4444;
  --danger-light: #fef2f2;

  /* Tekst */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  /* Typografie */
  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;

  /* Afmetingen */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Schaduwen */
  --shadow-sm: 0 1px 3px rgba(15,23,42,0.08);
  --shadow-md: 0 4px 16px rgba(15,23,42,0.10);
  --shadow-lg: 0 12px 40px rgba(15,23,42,0.12);

  /* Navigatie hoogte */
  --nav-height: 56px;

  /* Content breedte */
  --content-width: 1100px;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg-body);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 4px;
  box-shadow: var(--shadow-sm);
}

.nav-brand {
  font-size: 16px;
  font-weight: 800;
  color: var(--accent);
  margin-right: 16px;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.nav-btn {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-btn:hover {
  background: var(--surface-3);
  color: var(--text-primary);
}

.nav-btn.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
}

.page-content {
  width: min(100%, var(--content-width));
  margin: 0 auto;
  padding: 24px 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  border: none;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
  text-decoration: none;
  white-space: nowrap;
}

.btn:not(:disabled):hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

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

.btn-primary:not(:disabled):hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--surface-3);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

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

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

.btn-sm {
  padding: 5px 12px;
  font-size: 12px;
}

.btn-lg {
  padding: 12px 28px;
  font-size: 15px;
  border-radius: var(--radius-md);
}

.input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font-sans);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(30, 110, 181, 0.12);
}

.label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.hidden { display: none !important; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-accent { color: var(--accent); }
.font-mono { font-family: var(--font-mono); }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.w-full { width: 100%; }

@media (max-width: 640px) {
  .page-content { padding: 16px 12px; }
  .card { padding: 16px; }
  .top-nav { padding: 0 12px; }
}

/* ── Fullscreen knop ── */
.mp-fs-btn {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 998;
  box-shadow: var(--shadow-md,
    0 4px 16px rgba(0,0,0,0.12));
  transition: background 0.15s,
              color 0.15s,
              border-color 0.15s,
              transform 0.15s;
  line-height: 1;
}

.mp-fs-btn:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  transform: scale(1.08);
}

body:has(.manual-page) .mp-fs-btn {
  bottom: 84px;
}

@media print {
  .mp-fs-btn { display: none !important; }
}