body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #3e3e3e;

  /* 背景图 + 渐变叠加 */
  background-image: 
    linear-gradient(rgba(255,255,255,0.7), rgba(255,255,255,0.7)),
    url('https://images.unsplash.com/photo-1506744038136-46273834b3fb?auto=format&fit=crop&w=1470&q=80');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.container {
  background: rgba(255 255 255 / 0.85);
  padding: 40px 60px;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
  text-align: center;
  max-width: 400px;
}

h1 {
  font-weight: 700;
  font-size: 2.2rem;
  margin-bottom: 20px;
  color: #444;
}

p {
  font-weight: 400;
  font-size: 1.1rem;
  margin: 8px 0;
  line-height: 1.5;
  color: #555;
}

button {
  margin-top: 28px;
  padding: 10px 28px;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: #6b8eeb;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background: #5574d6;
}