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

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: #f4f6f8;
  color: #2c3e50;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 24px;
}

header h1 {
  font-size: 1.8rem;
  color: #1a252f;
}

header p {
  color: #7f8c8d;
  font-size: 0.95rem;
}

.container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

@media (min-width: 900px) {
  .container {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  background: #ffffff;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

h2 {
  font-size: 1.2rem;
  margin-bottom: 16px;
  color: #2c3e50;
  border-bottom: 2px solid #ecf0f1;
  padding-bottom: 8px;
}

.image-wrapper img {
  width: 100%;
  height: auto;
  border-radius: 6px;
  display: block;
}

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

.control-group h3 {
  font-size: 0.95rem;
  margin-bottom: 8px;
  color: #34495e;
}

.input-row {
  display: flex;
  gap: 8px;
}

input[type="text"] {
  flex: 1;
  padding: 10px;
  border: 1px solid #bdc3c7;
  border-radius: 4px;
  font-size: 0.9rem;
}

button {
  padding: 10px 14px;
  background-color: #3498db;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
}

button:hover {
  background-color: #2980b9;
}

button.primary-btn {
  background-color: #e74c3c;
}

button.primary-btn:hover {
  background-color: #c0392b;
}

.observer-list {
  list-style: none;
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.observer-tag {
  background: #e8f8f5;
  color: #16a085;
  border: 1px solid #a3e4d7;
  padding: 4px 10px;
  border-radius: 16px;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.observer-tag span {
  cursor: pointer;
  font-weight: bold;
  color: #e74c3c;
}

.terminal-box {
  background-color: #1e272e;
  color: #00d8d6;
  font-family: monospace;
  padding: 12px;
  border-radius: 6px;
  height: 180px;
  overflow-y: auto;
  font-size: 0.85rem;
  line-height: 1.4;
}

.log-entry {
  margin-bottom: 6px;
}

.log-event {
  color: #ffdd59;
  font-weight: bold;
}