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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #1a1a2e;
}

.container {
  width: 100%;
  max-width: 560px;
  padding: 24px;
}

header {
  text-align: center;
  margin-bottom: 32px;
}

.badge {
  display: inline-block;
  background: #4361ee;
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
}

.subtitle {
  color: #6b7280;
  font-size: 15px;
}

.card {
  background: #fff;
  border-radius: 16px;
  padding: 40px 32px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
}

.icon {
  font-size: 48px;
  margin-bottom: 16px;
}

h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

p {
  color: #4b5563;
  line-height: 1.7;
  margin-bottom: 8px;
}

.hint {
  color: #9ca3af;
  font-size: 13px;
  margin-top: 12px;
}

button {
  margin-top: 20px;
  background: #4361ee;
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

button:hover {
  background: #3a56d4;
}

.msg {
  margin-top: 16px;
  font-size: 14px;
  color: #059669;
  min-height: 20px;
}

footer {
  text-align: center;
  margin-top: 32px;
  color: #9ca3af;
  font-size: 13px;
}