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

body {
  font-family: "Microsoft YaHei", Arial, sans-serif;
  background: linear-gradient(135deg, #eef4ff, #f8fbff);
  min-height: 100vh;
  color: #1f2a44;
}

.page {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 720px;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 24px;
  padding: 40px 32px;
  box-shadow: 0 18px 45px rgba(47, 84, 235, 0.12);
  text-align: center;
}

.card h1 {
  font-size: 36px;
  margin-bottom: 12px;
  color: #1d2b53;
}

.desc {
  font-size: 16px;
  color: #6b7280;
  margin-bottom: 32px;
}

.role-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.role-btn {
  border: none;
  border-radius: 20px;
  padding: 28px 22px;
  text-align: left;
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.06);
}

.role-btn:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.1);
}

.guest-btn {
  background: linear-gradient(135deg, #dbeafe, #eff6ff);
}

.owner-btn {
  background: linear-gradient(135deg, #e9d5ff, #f5f3ff);
}

.role-title {
  display: block;
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 10px;
  color: #1e293b;
}

.role-text {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: #475569;
}

.bottom-tip {
  margin-top: 28px;
}

.back-link {
  color: #4f46e5;
  text-decoration: none;
  font-size: 15px;
}

.back-link:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  .card {
    padding: 30px 20px;
  }

  .card h1 {
    font-size: 28px;
  }

  .role-list {
    grid-template-columns: 1fr;
  }
}