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

body {
  font-family: Arial, Helvetica, sans-serif;
  background: #f5f5f5;
  color: #222;
  line-height: 1.5;
}

a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; }
input, select, textarea { font-family: inherit; outline: none; }

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: #fff;
  border-bottom: 1px solid #ddd;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 100;
}

.navbar__brand {
  font-size: 1.2rem;
  font-weight: bold;
  color: #222;
}

.navbar__links {
  display: flex;
  gap: 4px;
}

.navbar__link {
  padding: 6px 14px;
  border-radius: 4px;
  font-size: 0.875rem;
  font-weight: 500;
  color: #555;
}

.navbar__link:hover {
  background: #f0f0f0;
  color: #222;
}

.navbar__link.active {
  background: #2563eb;
  color: #fff;
}

.navbar__hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  padding: 4px;
}

.navbar__hamburger span {
  width: 20px;
  height: 2px;
  background: #555;
}

@media (max-width: 600px) {
  .navbar__links {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 12px;
    border-bottom: 1px solid #ddd;
    display: none;
  }
  .navbar__links.open { display: flex; }
  .navbar__hamburger { display: flex; }
}

/* Main */
.main {
  padding-top: 72px;
  padding-bottom: 40px;
  max-width: 1100px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* Views */
.view { display: none; }
.view.active { display: block; }

/* Page Header */
.page-header { margin-bottom: 20px; }
.page-header h1 { font-size: 1.5rem; font-weight: bold; }
.page-header p { color: #666; font-size: 0.9rem; margin-top: 4px; }

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
}

.stat-card__icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
  font-size: 1.2rem;
  background: #eff6ff;
  color: #2563eb;
}

.stat-card__value {
  font-size: 1.75rem;
  font-weight: bold;
}

.stat-card__label {
  font-size: 0.8rem;
  color: #888;
  text-transform: uppercase;
  margin-top: 4px;
}

/* Category Breakdown */
.breakdown {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
}

.breakdown h2 { font-size: 1rem; font-weight: bold; margin-bottom: 12px; }

.breakdown__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
}

.breakdown__item {
  background: #f9f9f9;
  border: 1px solid #eee;
  border-radius: 6px;
  padding: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.breakdown__cat { font-weight: 600; text-transform: capitalize; font-size: 0.9rem; }
.breakdown__nums { text-align: right; font-size: 0.8rem; color: #888; }
.breakdown__nums strong { display: block; color: #222; font-size: 1rem; }

/* Filters */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
  align-items: flex-end;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  min-width: 150px;
}

.filter-group label {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: #888;
  font-weight: 600;
}

.filter-group input,
.filter-group select {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 8px 10px;
  font-size: 0.875rem;
  color: #222;
}

.filter-group input:focus,
.filter-group select:focus {
  border-color: #2563eb;
}

.filter-actions { display: flex; gap: 8px; align-items: flex-end; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 4px;
  font-size: 0.875rem;
  font-weight: 600;
}

.btn-primary { background: #2563eb; color: #fff; }
.btn-primary:hover { background: #1d4ed8; }
.btn-secondary { background: #fff; color: #333; border: 1px solid #ddd; }
.btn-secondary:hover { background: #f5f5f5; }
.btn-danger { background: #fee2e2; color: #dc2626; border: 1px solid #fecaca; }
.btn-danger:hover { background: #dc2626; color: #fff; }
.btn-ghost { background: transparent; color: #666; padding: 6px 8px; }
.btn-ghost:hover { background: #f0f0f0; color: #222; }
.btn-sm { padding: 4px 8px; font-size: 0.8rem; }

/* Event Cards */
.events-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.event-card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.event-card:hover { border-color: #2563eb; }

.event-card__category {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  background: #eff6ff;
  color: #2563eb;
  margin-bottom: 8px;
  width: fit-content;
}

.event-card__title { font-size: 1rem; font-weight: bold; margin-bottom: 8px; }

.event-card__meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
  flex: 1;
}

.event-card__meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.825rem;
  color: #666;
}

.event-card__meta-item i { font-size: 14px; }

.event-card__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid #eee;
  padding-top: 12px;
  margin-top: auto;
}

.event-card__registrations { font-size: 0.8rem; color: #888; }
.event-card__registrations strong { color: #2563eb; }
.event-card__actions { display: flex; gap: 4px; }

/* Event Detail */
.detail-header { margin-bottom: 20px; }

.detail-header__back {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: #666;
  font-size: 0.875rem;
  margin-bottom: 12px;
}

.detail-header__back:hover { color: #2563eb; }

.detail-header__category {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  background: #eff6ff;
  color: #2563eb;
  margin-bottom: 8px;
}

.detail-header h1 { font-size: 1.5rem; font-weight: bold; }

.detail-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.detail-info__card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 16px;
}

.detail-info__card h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: #888;
  margin-bottom: 6px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}

.detail-info__card h3 i { font-size: 14px; }
.detail-info__card p { font-size: 0.9rem; }

.detail-description {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

.detail-description h2 { font-size: 1rem; font-weight: bold; margin-bottom: 8px; }
.detail-description p { color: #555; }

.spots-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.825rem;
  font-weight: 600;
}

.spots-badge.available { background: #dcfce7; color: #16a34a; }
.spots-badge.full { background: #fee2e2; color: #dc2626; }

/* Attendees */
.attendees {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

.attendees h2 {
  font-size: 1rem;
  font-weight: bold;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.attendees__count {
  background: #2563eb;
  color: #fff;
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 10px;
}

.attendee-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid #eee;
}

.attendee-row:last-child { border-bottom: none; }
.attendee-info__name { font-weight: 600; font-size: 0.9rem; }
.attendee-info__email { font-size: 0.8rem; color: #888; }
.attendees__empty { text-align: center; padding: 24px; color: #888; font-size: 0.9rem; }

/* Registration */
.register-section {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
}

.register-section h2 { font-size: 1rem; font-weight: bold; margin-bottom: 12px; }

.register-section .form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.register-section .full-msg {
  text-align: center;
  padding: 16px;
  background: #fee2e2;
  border-radius: 6px;
  color: #dc2626;
  font-weight: 600;
}

/* Form */
.form { max-width: 600px; }

.form-group {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.form-group label { font-size: 0.8rem; font-weight: 600; color: #555; }

.form-group input,
.form-group select,
.form-group textarea {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 8px 12px;
  font-size: 0.9rem;
  color: #222;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: #2563eb;
}

.form-group textarea { min-height: 80px; resize: vertical; }
.form-group .field-error { font-size: 0.78rem; color: #dc2626; }

.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea {
  border-color: #dc2626;
}

.form-actions { display: flex; gap: 10px; margin-top: 20px; }

/* Toast */
.toast-container {
  position: fixed;
  top: 64px;
  right: 16px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 10px 16px;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 260px;
  max-width: 400px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.toast.success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.toast.error { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 300;
  display: none;
  align-items: center;
  justify-content: center;
}

.modal-overlay.active { display: flex; }

.modal {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 24px;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.modal h3 { font-size: 1.1rem; font-weight: bold; margin-bottom: 8px; }
.modal p { color: #555; font-size: 0.9rem; margin-bottom: 20px; }
.modal__actions { display: flex; gap: 10px; justify-content: flex-end; }

/* Loading */
.skeleton { background: #e5e5e5; border-radius: 8px; min-height: 100px; }

/* Empty State */
.empty-state { text-align: center; padding: 48px 20px; color: #888; }
.empty-state h3 { font-size: 1rem; color: #666; margin-bottom: 4px; }

/* Responsive */
@media (max-width: 768px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .events-grid { grid-template-columns: 1fr; }
  .detail-info { grid-template-columns: 1fr; }
  .register-section .form-row { grid-template-columns: 1fr; }
  .filters { flex-direction: column; }
  .filter-group { min-width: 100%; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .breakdown__grid { grid-template-columns: 1fr; }
}