*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --accent: #6366f1;
  --accent-light: #eef2ff;
  --accent-hover: #4f46e5;
  --bg: #fafaf9;
  --surface: #ffffff;
  --text: #1c1917;
  --text-secondary: #78716c;
  --text-tertiary: #a8a29e;
  --border: #e7e5e4;
  --border-light: #f5f5f4;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --success: #22c55e;
  --success-light: #f0fdf4;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.04), 0 2px 4px rgba(0,0,0,0.03);
  --transition: 0.15s ease;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}

/* ---- Layout ---- */

.page {
  max-width: 480px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}
.page--wide { max-width: 720px; }

.page-header {
  margin-bottom: 32px;
}
.page-header h1 {
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.page-header .subtitle {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-top: 4px;
}
.page-header .back {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--text-tertiary);
  text-decoration: none;
  font-size: 0.875rem;
  margin-bottom: 12px;
}
.page-header .back:hover { color: var(--text-secondary); }
.page-header .back svg { width: 16px; height: 16px; }

.dag-edit-form {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.dag-edit-form__naam {
  flex: 1 1 200px;
  min-width: 0;
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  border: 1px solid transparent;
  background: transparent;
  padding: 4px 8px;
  margin: -4px -8px;
  border-radius: 8px;
}
.dag-edit-form__naam:hover { border-color: var(--border); }
.dag-edit-form__naam:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface);
}
.dag-edit-form__datum {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  padding: 6px 8px;
  border: 1px solid transparent;
  background: transparent;
  border-radius: 6px;
}
.dag-edit-form__datum:hover { border-color: var(--border); }
.dag-edit-form__datum:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface);
}

/* ---- Typography ---- */

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  margin-bottom: 12px;
}

/* ---- Forms ---- */

.field { margin-bottom: 16px; }
.field label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

input[type="text"],
input[type="password"],
input[type="date"],
input[type="number"],
textarea,
select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}
textarea { resize: vertical; }
input::placeholder, textarea::placeholder {
  color: var(--text-tertiary);
}

.naam-rij {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 28px;
}

/* ---- Buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  line-height: 1.4;
}

.btn--primary {
  background: var(--accent);
  color: white;
}
.btn--primary:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }

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

.btn--danger {
  background: var(--danger-light);
  color: var(--danger);
  border: 1px solid transparent;
}
.btn--danger:hover { background: #fee2e2; }

.btn--ghost {
  background: none;
  color: var(--text-secondary);
  padding: 6px 12px;
}
.btn--ghost:hover { color: var(--text); background: var(--border-light); }

.btn--block { width: 100%; }
.btn--sm { padding: 6px 14px; font-size: 0.8125rem; }

.btn--submit {
  width: 100%;
  padding: 14px 20px;
  font-size: 1rem;
  margin-top: 8px;
}

/* ---- Session cards (participant) ---- */

.slot-section {
  margin-bottom: 32px;
}
.slot-section fieldset { border: none; padding: 0; }
.slot-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 12px;
  padding-left: 2px;
}

.sessie-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sessie-card {
  position: relative;
  display: block;
  padding: 16px;
  background: var(--surface);
  border: 2px solid transparent;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition);
}
.sessie-card:hover {
  box-shadow: var(--shadow);
}
.sessie-card:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-light);
  box-shadow: var(--shadow), 0 0 0 1px var(--accent);
}
.sessie-card.is-vol {
  opacity: 0.5;
  cursor: not-allowed;
}
.sessie-card.is-vol:hover { box-shadow: var(--shadow-sm); }

.sessie-card input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.sessie-card__naam {
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1.3;
}
.sessie-card__beschrijving {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 4px;
  line-height: 1.5;
  white-space: pre-line;
}

.sessie-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
}

.capaciteit {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}
.capaciteit__bar {
  width: 48px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.capaciteit__fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.3s ease;
}
.capaciteit__fill--vol { background: var(--danger); }

.vol-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--danger);
}

/* Checked indicator */
.sessie-card__check {
  display: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.sessie-card:has(input:checked) .sessie-card__check { display: flex; }

/* ---- Confirmation page ---- */

.bevestiging-kaart {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 16px;
  margin-bottom: 10px;
}
.bevestiging-kaart__slot {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
}
.bevestiging-kaart__naam {
  font-weight: 600;
  font-size: 0.9375rem;
  margin-top: 2px;
}
.bevestiging-kaart__beschrijving {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.bevestiging-acties {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.welkom-msg {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}
.welkom-msg strong { color: var(--text); }

/* ---- Conflict page ---- */

.conflict-box {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  text-align: center;
}
.conflict-box p {
  color: var(--text-secondary);
  margin: 8px 0 20px;
}
.conflict-box .btn { margin: 4px; }

/* ---- Error page ---- */

.error-box {
  background: var(--danger-light);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}
.error-box p {
  color: var(--danger);
  margin: 8px 0 16px;
}

/* ---- Reaction form ---- */

.reactie-form textarea {
  min-height: 120px;
}
.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 12px 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
  cursor: pointer;
}
.checkbox-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

/* ---- Admin ---- */

.admin-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.admin-nav a { text-decoration: none; color: var(--text-secondary); font-size: 0.875rem; }
.admin-nav a:hover { color: var(--text); }

.share-url {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-bottom: 24px;
}
.share-url code {
  flex: 1;
  font-size: 0.875rem;
  color: var(--accent);
  word-break: break-all;
}
.share-url a {
  font-size: 0.8125rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  white-space: nowrap;
}

.qr-block {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 24px;
  text-align: center;
}
.qr-image {
  width: 240px;
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}
.qr-caption {
  margin-top: 12px;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

.dag-card {
  display: block;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 16px 20px;
  margin-bottom: 10px;
  text-decoration: none;
  color: var(--text);
  transition: box-shadow var(--transition);
}
.dag-card:hover { box-shadow: var(--shadow-md); }
.dag-card__naam { font-weight: 600; }
.dag-card__meta { font-size: 0.8125rem; color: var(--text-tertiary); margin-top: 2px; }

.dag-card-wrap {
  position: relative;
}
.dag-card-wrap .dag-card { padding-right: 96px; }
.dag-card__delete {
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
}

.admin-section {
  margin-bottom: 32px;
}

.admin-slot {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 20px;
  margin-bottom: 12px;
}
.admin-slot__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.admin-slot__header h3 {
  font-size: 0.9375rem;
  font-weight: 600;
}

.admin-sessie {
  padding: 16px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
}
.admin-sessie.is-overbezet {
  background: var(--danger-light);
}
.admin-sessie__row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: start;
  margin-bottom: 8px;
}
.admin-sessie__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}
.admin-sessie__meta .overbezet-label {
  color: var(--danger);
  font-weight: 600;
}
.admin-sessie__acties {
  display: flex;
  gap: 6px;
  margin-top: 8px;
}

.nieuwe-sessie {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 8px;
  align-items: end;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
}
.nieuwe-sessie input[type="text"] { min-width: 0; }

.nieuw-tijdslot {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 20px;
  margin-bottom: 12px;
}
.nieuw-tijdslot__row {
  display: grid;
  grid-template-columns: 1fr 80px auto;
  gap: 8px;
  align-items: end;
}

/* Admin table */
.admin-tabel {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.admin-tabel th {
  text-align: left;
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-tertiary);
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
}
.admin-tabel td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-light);
  vertical-align: middle;
}
.admin-tabel tr:last-child td { border-bottom: none; }
.admin-tabel .naam-cel { font-weight: 500; }
.admin-tabel .sessie-cel { color: var(--text-secondary); font-size: 0.8125rem; }

.admin-footer-acties {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

/* Admin login */
.welkom {
  max-width: 420px;
  margin: 80px auto 0;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 32px;
  text-align: center;
}
.welkom h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.welkom p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.5;
}

.login-box {
  max-width: 320px;
  margin: 80px auto 0;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
}
.login-box h1 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 24px;
  text-align: center;
}

/* Reactions (admin view) */
.reactie-item {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 16px;
  margin-bottom: 10px;
}
.reactie-item__header {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
  font-size: 0.8125rem;
}
.reactie-item__sessie { font-weight: 600; color: var(--text); }
.reactie-item__slot { color: var(--accent); }
.reactie-item__auteur { color: var(--text-tertiary); margin-left: auto; }
.reactie-item__tekst {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* ---- Responsive ---- */
@media (min-width: 640px) {
  .page { padding: 40px 24px 64px; }
  .page-header h1 { font-size: 1.875rem; }
}