:root {
  --primary: #1f3a93;
  --primary-light: #2a4cb8;
  --primary-dark: #182d6f;
  --secondary: #e8f0ff;
  --text: #1a1a1a;
  --text-light: #666;
  --border: #d0d0d0;
  --error: #dc2626;
  --success: #16a34a;
  --spacing: 8px;
  --radius: 6px;
}

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

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  color: var(--text);
  background: #f5f7fa;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.header {
  background: var(--primary);
  color: white;
  padding: calc(var(--spacing) * 4);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: calc(var(--spacing) * 2);
}

.header h1 {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.5px;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing) * 1.5);
  background: rgba(255, 255, 255, 0.1);
  padding: calc(var(--spacing) * 1) calc(var(--spacing) * 2);
  border-radius: var(--radius);
  font-size: 14px;
  min-width: 100px;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.status-dot.online {
  background: #4ade80;
}

.status-dot.offline {
  background: #fbbf24;
  animation: none;
}

.status-text {
  font-weight: 500;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

.container {
  flex: 1;
  max-width: 600px;
  width: 100%;
  margin: calc(var(--spacing) * 4) auto;
  padding: 0 calc(var(--spacing) * 2);
}

.form-section, .summary-section {
  background: white;
  border-radius: var(--radius);
  padding: calc(var(--spacing) * 4);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.registration-form {
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing) * 3);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing) * 1);
}

.form-group label {
  font-weight: 500;
  font-size: 14px;
  color: var(--text);
}

.form-group input,
.form-group select {
  padding: calc(var(--spacing) * 2) calc(var(--spacing) * 2.5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 16px;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(31, 58, 147, 0.1);
}

.form-group input::placeholder {
  color: var(--text-light);
}

.form-actions {
  display: flex;
  gap: calc(var(--spacing) * 2);
  margin-top: calc(var(--spacing) * 2);
}

.btn {
  flex: 1;
  padding: calc(var(--spacing) * 2.5) calc(var(--spacing) * 3);
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(31, 58, 147, 0.2);
}

.btn-primary:active {
  transform: translateY(0);
}

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

.btn-secondary:hover {
  background: #d6e5ff;
  transform: translateY(-1px);
}

.btn-secondary:active {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.error-message {
  background: #fee2e2;
  color: var(--error);
  padding: calc(var(--spacing) * 2);
  border-radius: var(--radius);
  border-left: 4px solid var(--error);
  font-size: 14px;
  margin-top: calc(var(--spacing) * 2);
}

.loading-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(var(--spacing) * 2);
  padding: calc(var(--spacing) * 3);
  text-align: center;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--secondary);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

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

.success-icon {
  font-size: 64px;
  color: var(--success);
  margin-bottom: calc(var(--spacing) * 2);
  animation: scaleIn 0.5s ease-out;
}

@keyframes scaleIn {
  from {
    transform: scale(0);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.success-card h2 {
  font-size: 28px;
  margin-bottom: calc(var(--spacing) * 2);
  color: var(--primary);
}

.thank-you {
  font-size: 20px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: calc(var(--spacing) * 1);
}

.summary-text {
  color: var(--text-light);
  margin-bottom: calc(var(--spacing) * 4);
  font-size: 14px;
}

.footer {
  text-align: center;
  padding: calc(var(--spacing) * 3);
  color: var(--text-light);
  font-size: 12px;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

@media (max-width: 640px) {
  .header {
    flex-direction: column;
    text-align: center;
    padding: calc(var(--spacing) * 3);
  }

  .header h1 {
    font-size: 20px;
  }

  .status-indicator {
    width: 100%;
    justify-content: center;
  }

  .container {
    margin: calc(var(--spacing) * 2) auto;
    padding: 0 calc(var(--spacing) * 1.5);
  }

  .form-section, .summary-section {
    padding: calc(var(--spacing) * 3);
  }

  .form-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .success-card h2 {
    font-size: 24px;
  }

  .thank-you {
    font-size: 18px;
  }
}