body {
  font-family: system-ui, sans-serif;
  background: #0b1220;
  color: #e5e7eb;
  padding: 20px;
}

h1 {
  text-align: center;
  margin-bottom: 30px;
}

.app-header {
  text-align: center;
  margin-bottom: 30px;
  position: relative;
}

.back {
  position: absolute;
  left: 0;
  top: 0;
  color: #9ca3af;
  text-decoration: none;
  font-size: 14px;
}

.app-header h1 {
  margin: 0;
  font-size: 30px;
}

.app-header p {
  margin-top: 6px;
  opacity: 0.7;
}

.list {
  max-width: 600px;
  margin: auto;
}

.item {
  width: 100%;
  padding: 14px;
  margin-bottom: 10px;
  font-size: 18px;
  text-align: left;
  background: #020617;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

.content {
  display: none;
  background: #020617;
  padding: 15px;
  margin-bottom: 15px;
  border-left: 3px solid #22c55e;
  border-radius: 6px;
}

.app-note {
  margin-top: 10px;
  font-weight: bold;
  color: #22c55e;
}

.app-footer {
  text-align: center;
  margin-top: 40px;
  opacity: 0.85;
  font-size: 14px;
}

body {
  line-height: 1.6;
}

button, a {
  font-family: inherit;
}