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

:root {
  --bg-start: #0f172a;
  --bg-end: #1e293b;
  --card-bg: rgba(255, 255, 255, 0.96);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #dbeafe;
  --border: #e2e8f0;
  --shadow: 0 24px 48px rgba(15, 23, 42, 0.18);
}

html,
body {
  min-height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--bg-start) 0%, var(--bg-end) 100%);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 16px 32px;
}

.card {
  width: 100%;
  max-width: 520px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 32px 36px;
  box-shadow: var(--shadow);
  text-align: center;
}

.badge {
  display: inline-block;
  padding: 6px 14px;
  margin-bottom: 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-light);
  border-radius: 999px;
  letter-spacing: 0.02em;
}

h1 {
  font-size: clamp(24px, 5vw, 30px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.lead {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 200px;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  background: var(--accent);
  border-radius: 12px;
  transition: background 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.28);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.32);
}

.btn-primary:active {
  transform: translateY(0);
}

.hint {
  margin-top: 24px;
  font-size: 13px;
  color: var(--text-muted);
}

.footer {
  margin-top: 24px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
}

@media (max-width: 480px) {
  .card {
    padding: 32px 20px 28px;
    border-radius: 16px;
  }

  .btn-primary {
    width: 100%;
  }
}