* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at top, #222 0, #000 55%);
  color: #f5f5f5;
}

.wrapper {
  text-align: center;
  padding: 2.5rem 3rem;
  background: rgba(15, 15, 15, 0.9);
  border-radius: 18px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.7);
  max-width: 480px;
}

h1 {
  font-size: 2.4rem;
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 0.95rem;
  color: #bbbbbb;
  margin-bottom: 1.8rem;
}

.nothing-box {
  border: 1px dashed #555;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.8rem;
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #cccccc;
}

button {
  border: none;
  border-radius: 999px;
  padding: 0.8rem 1.8rem;
  background: linear-gradient(135deg, #444, #777);
  color: #f5f5f5;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.2s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.5);
  background: linear-gradient(135deg, #555, #888);
}

button:active {
  transform: translateY(1px);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.6);
}