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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  color: white;
}

.header > div {
  display: flex;
  gap: 10px;
}

.card {
  background: white;
  border-radius: 10px;
  padding: 30px;
  margin-bottom: 30px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

h1 {
  color: white;
  font-size: 2.5em;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

h2 {
  color: #333;
  margin-bottom: 20px;
}

h3 {
  color: #444;
  margin-bottom: 10px;
}

.button {
  display: inline-block;
  padding: 12px 24px;
  background: #667eea;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  text-decoration: none;
  font-size: 16px;
  transition: all 0.3s ease;
}

.button:hover {
  background: #5a67d8;
  transform: translateY(-2px);
}

.button.primary {
  background: #667eea;
}

.button.secondary {
  background: #48bb78;
}

.button.secondary:hover {
  background: #38a169;
}

.button.danger {
  background: #f56565;
}

.button.danger:hover {
  background: #e53e3e;
}

.button.small {
  padding: 8px 16px;
  font-size: 14px;
}

.button-group {
  display: flex;
  gap: 20px;
  margin-top: 20px;
}

.form-group {
  margin-bottom: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

label {
  display: block;
  margin-bottom: 5px;
  color: #555;
  font-weight: 500;
}

input,
textarea,
select {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
  font-size: 16px;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: #667eea;
}

.talks-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.talk-item {
  padding: 20px;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  background: #f8f9fa;
}

.talk-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}

.talk-actions {
  display: flex;
  gap: 10px;
}

.speaker {
  color: #666;
  font-style: italic;
  margin-bottom: 10px;
}

.description {
  color: #444;
  margin-bottom: 15px;
}

.schedule-info {
  display: flex;
  gap: 20px;
  color: #666;
  font-size: 14px;
}

.time,
.room {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.talks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.talk-card {
  padding: 20px;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  background: #f8f9fa;
  transition: all 0.3s ease;
}

.talk-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.talk-card.registered {
  background: #e6fffa;
  border-color: #48bb78;
}

.register-btn {
  width: 100%;
  margin-top: 15px;
}

.register-btn.registered {
  background: #48bb78;
}

.register-btn.registered:hover {
  background: #f56565;
}

.info {
  background: #e6fffa;
  padding: 15px;
  border-radius: 5px;
  margin-bottom: 20px;
  color: #2c5282;
}

.registered-talks {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
  background-color: white;
  margin: 5% auto;
  padding: 30px;
  border-radius: 10px;
  width: 90%;
  max-width: 600px;
  position: relative;
}

.close {
  position: absolute;
  right: 20px;
  top: 20px;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
  color: #999;
}

.close:hover {
  color: #333;
}

/* Attendees page specific */
.attendees-container {
  max-width: 1200px;
  margin: 0 auto;
}

.attendees-stats {
  display: flex;
  gap: 2rem;
  margin-bottom: 2rem;
}

.stat-card {
  flex: 1;
  background: white;
  padding: 1.5rem;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: bold;
  color: #2196f3;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.9rem;
  color: #666;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.attendees-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.attendee-card {
  background: white;
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.attendee-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

.attendee-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #f0f0f0;
}

.attendee-header h3 {
  margin: 0;
  color: #333;
}

.delete-attendee-btn {
  background: #ff4444;
  color: white;
  border: none;
  border-radius: 5px;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.3s ease;
}

.delete-attendee-btn:hover {
  background: #cc0000;
  transform: scale(1.1);
}

.attendee-details p {
  margin: 0.5rem 0;
  color: #666;
  font-size: 0.9rem;
}

.attendee-details .email {
  color: #2196f3;
}

.attendee-details .registered-talks {
  color: #4caf50;
  font-weight: 500;
}

.attendee-details .created-at {
  font-size: 0.85rem;
  color: #999;
}

.empty-state {
  text-align: center;
  padding: 3rem;
  background: white;
  border-radius: 10px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.empty-state h3 {
  color: #666;
  margin-bottom: 1rem;
}

.empty-state p {
  color: #999;
  margin-bottom: 2rem;
}

.subtitle {
  color: #666;
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

@keyframes fadeOutScale {
  0% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(0.8);
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 1.8em;
  }

  .header {
    flex-direction: column;
    gap: 20px;
    align-items: flex-start;
  }

  .talks-grid {
    grid-template-columns: 1fr;
  }

  .button-group {
    flex-direction: column;
  }

  .attendees-grid {
    grid-template-columns: 1fr;
  }

  .attendees-stats {
    flex-direction: column;
  }
}