:root {
  color-scheme: light;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: #f5f6fa;
  color: #1f2430;
}

body {
  margin: 0;
  padding: 24px;
}

.site-header {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 24px;
}

.logo {
  font-size: 28px;
  font-weight: 700;
}

.subtitle {
  color: #5c6372;
}

.layout {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.panel {
  background: #ffffff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 10px 24px rgba(31, 36, 48, 0.08);
}

button {
  padding: 10px 16px;
  border-radius: 8px;
  border: none;
  background: #1f2430;
  color: #ffffff;
  cursor: pointer;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.status {
  margin-top: 12px;
  font-size: 14px;
  color: #444b59;
}

.unit-list,
.ring-list {
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

.unit-card,
.ring-card {
  padding: 12px;
  border-radius: 10px;
  border: 1px solid #e5e7ef;
  display: grid;
  gap: 8px;
}