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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(135deg, #051225 0%, #0a2647 50%, #023047 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  color: #e6f1ff;
}

.container {
  width: 100%;
  max-width: 550px;
}

.card {
  background: rgba(10, 30, 70, 0.6);
  backdrop-filter: blur(8px);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5),
              0 0 0 1px rgba(100, 200, 255, 0.15);
  border: 1px solid rgba(100, 200, 255, 0.2);
}

h1 {
  font-size: 1.6rem;
  font-weight: 500;
  text-align: center;
  margin-bottom: 1.5rem;
  color: #b8e2ff;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

.advice {
  font-size: 1.2rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: rgba(15, 35, 70, 0.6);
  border-radius: 8px;
  border: 1px solid rgba(100, 200, 255, 0.15);
  color: #e6f1ff;
  min-height: 2rem;
}
.btn {
  width: 100%;
  padding: 1rem;
  font-size: 1.1rem;
  font-weight: 500;
  color: #fff;
  background: linear-gradient(90deg, #0a4c4c, #0a6666);
  border: none;
  border-radius: 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 2px 8px rgba(0, 100, 100, 0.3);
}

.btn:hover {
  box-shadow: 0 0 0 2px rgba(0, 140, 140, 0.4);
  transform: translateY(-1px);
  background: linear-gradient(90deg, #0a5858, #0a7777);
}

.btn:active {
  transform: translateY(0);
  opacity: 0.9;
}