:root {
  --primary-color: #4361ee;
  --secondary-color: #3f37c9;
  --success-color: #4cc9f0;
  --danger-color: #f72585;
  --light-color: #f8f9fa;
  --dark-color: #212529;
  --border-radius: 8px;
  --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: #f5f7fa;
  color: var(--dark-color);
  padding: 20px;
  line-height: 1.6;
}

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

h1 {
  text-align: center;
  margin-bottom: 30px;
  color: var(--primary-color);
}

.controls {
  display: flex;
  justify-content: center;
  margin-bottom: 30px;
}

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s ease;
}

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

.btn-primary:hover {
  background-color: var(--secondary-color);
  transform: translateY(-2px);
}

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

.btn-danger:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

.btn-success {
  background-color: var(--success-color);
  color: var(--dark-color);
}

.btn-success:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

.btn-close {
  background: none;
  border: none;
  color: #6c757d;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0 5px;
  transition: color 0.2s;
}

.btn-close:hover {
  color: var(--danger-color);
}

.sse-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 20px;
}

.sse-box {
  background-color: white;
  border-radius: var(--border-radius);
  padding: 20px;
  box-shadow: var(--box-shadow);
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
}

.sse-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 1px solid #eee;
}

.sse-id {
  font-weight: bold;
  color: var(--primary-color);
}

.sse-status {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin-right: 8px;
}

.status-connected {
  background-color: #4ade80;
}

.status-disconnected {
  background-color: #f87171;
}

.sse-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
}

.sse-input {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
}

.input-field {
  flex: 1;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: var(--border-radius);
  font-size: 16px;
}

.input-field:focus {
  outline: none;
  border-color: var(--primary-color);
}

.messages-list {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
  background-color: #f8f9fa;
  border-radius: var(--border-radius);
  max-height: 300px;
  min-height: 100px;
}

.message {
  padding: 8px 12px;
  margin-bottom: 8px;
  border-radius: var(--border-radius);
  background-color: white;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  word-break: break-word;
}

.message-client {
  border-left: 4px solid var(--primary-color);
}

.message-server {
  border-left: 4px solid var(--success-color);
}

.message-info {
  border-left: 4px solid #6c757d;
}

.message-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 4px;
  font-size: 0.85rem;
}

.message-origin {
  font-weight: bold;
}

.message-client .message-origin {
  color: var(--primary-color);
}

.message-server .message-origin {
  color: var(--success-color);
}

.message-info .message-origin {
  color: #6c757d;
}

.timestamp {
  color: #6c757d;
}

.message-content {
  font-size: 0.95rem;
}

.empty-state {
  color: #6c757d;
  text-align: center;
  padding: 20px;
}