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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: #FFFFFF;
  color: #1A1A1A;
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 40px 20px;
}

.header {
  text-align: center;
  margin-bottom: 40px;
  padding-bottom: 30px;
  border-bottom: 2px solid #1A1A1A;
}

.logo {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 5px;
}

.tagline {
  font-size: 14px;
  color: #666666;
  letter-spacing: 1px;
}

.event-title {
  margin-top: 20px;
  font-size: 20px;
  font-weight: 600;
}

.form-group {
  margin-bottom: 25px;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 14px;
}

.required::after {
  content: ' *';
  color: #1A1A1A;
}

input[type="text"],
input[type="email"],
input[type="tel"] {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid #E0E0E0;
  font-size: 16px;
  transition: border-color 0.2s;
  background-color: #FFFFFF;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus {
  outline: none;
  border-color: #1A1A1A;
}

.field-hint {
  font-size: 12px;
  color: #666666;
  margin-top: 4px;
}

.radio-group {
  display: flex;
  gap: 30px;
}

.radio-item {
  display: flex;
  align-items: center;
  cursor: pointer;
}

.radio-item input[type="radio"] {
  width: 18px;
  height: 18px;
  margin-right: 10px;
  cursor: pointer;
  accent-color: #1A1A1A;
}

.attendees-section {
  transition: opacity 0.2s, max-height 0.2s;
  overflow: hidden;
}

.attendees-section.hidden {
  opacity: 0;
  max-height: 0;
  margin: 0;
  pointer-events: none;
}

.attendees-section.visible {
  opacity: 1;
  max-height: 200px;
}

.btn {
  display: inline-block;
  padding: 14px 40px;
  background-color: #1A1A1A;
  color: #FFFFFF;
  border: none;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
  text-decoration: none;
}

.btn:hover {
  background-color: #333333;
}

.btn:disabled {
  background-color: #999999;
  cursor: not-allowed;
}

.btn-block {
  display: block;
  width: 100%;
  text-align: center;
}

.btn-secondary {
  background-color: #FFFFFF;
  color: #1A1A1A;
  border: 2px solid #1A1A1A;
}

.btn-secondary:hover {
  background-color: #F5F5F5;
}

.message {
  padding: 15px;
  margin-bottom: 20px;
  border: 1px solid;
}

.message-error {
  border-color: #1A1A1A;
  background-color: #F5F5F5;
}

.message-success {
  border-color: #1A1A1A;
  background-color: #FFFFFF;
}

.success-icon {
  font-size: 64px;
  margin-bottom: 20px;
}

.success-content {
  text-align: center;
}

.success-content h1 {
  font-size: 24px;
  margin-bottom: 15px;
}

.success-content p {
  color: #666666;
  margin-bottom: 10px;
}

.footer {
  text-align: center;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid #E0E0E0;
  color: #666666;
  font-size: 12px;
}

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid #FFFFFF;
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Admin */
.admin-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 40px;
}

.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 2px solid #1A1A1A;
  margin-bottom: 30px;
}

.admin-nav {
  display: flex;
  gap: 20px;
  align-items: center;
}

.admin-nav a {
  color: #1A1A1A;
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
}

.admin-nav a:hover {
  text-decoration: underline;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 30px;
}

.stat-card {
  padding: 20px;
  border: 1px solid #E0E0E0;
  text-align: center;
}

.stat-value {
  font-size: 36px;
  font-weight: 700;
}

.stat-label {
  font-size: 14px;
  color: #666666;
  margin-top: 5px;
}

.toolbar {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
  align-items: center;
}

.toolbar input[type="text"] {
  flex: 1;
  padding: 10px 15px;
  border: 1px solid #E0E0E0;
  font-size: 14px;
}

.toolbar input[type="text"]:focus {
  outline: none;
  border-color: #1A1A1A;
}

.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid #E0E0E0;
  font-size: 14px;
  white-space: nowrap;
}

th {
  background-color: #1A1A1A;
  color: #FFFFFF;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
}

th:hover {
  background-color: #333333;
}

th .sort-arrow {
  margin-left: 6px;
  font-size: 10px;
}

tr:hover {
  background-color: #F5F5F5;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
}

.badge-attending {
  background-color: #1A1A1A;
  color: #FFFFFF;
}

.badge-not-attending {
  background-color: #E0E0E0;
  color: #1A1A1A;
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: #666666;
}

.empty-state p {
  font-size: 16px;
}

/* Login */
.login-container {
  max-width: 400px;
  margin: 80px auto;
  padding: 0 20px;
}

.login-card {
  border: 1px solid #E0E0E0;
  padding: 40px;
}

.login-card h1 {
  font-size: 20px;
  margin-bottom: 5px;
}

.login-card .subtitle {
  color: #666666;
  font-size: 14px;
  margin-bottom: 30px;
}

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

.login-card input {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid #E0E0E0;
  font-size: 16px;
}

.login-card input:focus {
  outline: none;
  border-color: #1A1A1A;
}

.login-footer {
  text-align: center;
  margin-top: 20px;
}

.login-footer a {
  color: #666666;
  font-size: 14px;
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .toolbar {
    flex-direction: column;
  }

  .admin-header {
    flex-direction: column;
    gap: 15px;
  }
}

@media (max-width: 600px) {
  .container {
    padding: 20px 15px;
  }

  .radio-group {
    flex-direction: column;
    gap: 12px;
  }
}