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

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1e3c72, #2a5298);
  font-family: system-ui, "Microsoft YaHei", sans-serif;
}

.card {
  background: #fff;
  border-radius: 16px;
  padding: 40px 48px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

h1 { color: #f6821f; font-size: 26px; margin-bottom: 12px; }

.sub { color: #666; font-size: 14px; margin-bottom: 24px; }

#btn {
  background: #f6821f;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px 32px;
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.1s;
}

#btn:active { transform: scale(0.95); }

#counter { margin-top: 16px; color: #333; font-size: 15px; }