body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  background: linear-gradient(180deg, #e9f2ff 0%, #eef3f9 100%);
  color: #222;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.page {
  width: 100%;
  max-width: 430px;
  padding: 20px 16px;
  box-sizing: border-box;
}

.center-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.logo {
  width: 80px;
  height: 80px;
  margin-bottom: 12px;
}

h1 {
  font-size: 24px;
  font-weight: 700;
  color: #000;
  margin: 8px 0;
}

.subtitle {
  color: #555;
  font-size: 15px;
}

.domain {
  color: #888;
  font-size: 14px;
  margin: 10px 0 30px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #fff;
  color: #007aff;
  border: 2px solid #007aff;
  border-radius: 30px;
  font-weight: 600;
  padding: 12px 24px;
  text-decoration: none;
  transition: 0.25s ease;
  box-shadow: 0 2px 6px rgba(0,122,255,.1);
}

.btn img {
  width: 20px;
  height: 20px;
  filter: brightness(0) saturate(100%) invert(34%) sepia(89%) saturate(3107%) hue-rotate(200deg) brightness(98%) contrast(101%);
}

.btn:hover {
  background: #007aff;
  color: #fff;
  box-shadow: 0 4px 10px rgba(0,122,255,.2);
}

.btn:hover img {
  filter: brightness(0) invert(1);
}

footer {
  margin-top: 40px;
  font-size: 14px;
  color: #999;
}