:root {
  --primary: #4f46e5;
  --bg: #f9fafb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
}

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

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
}

.card {
  background: var(--card);
  padding: 2.5rem;
  max-width: 420px;
  width: 100%;
  text-align: center;
  border-radius: 1rem;
  box-shadow:
    0 10px 25px rgba(0, 0, 0, 0.08),
    0 4px 10px rgba(0, 0, 0, 0.04);
}

.icon {
  width: 96px;
  height: 96px;
  margin: 0 auto 1.5rem;
  color: var(--primary);
}

h1 {
  font-size: 1.875rem;
  margin-bottom: 1rem;
  color: var(--primary);
}

p {
  font-size: 1.05rem;
  line-height: 1.6;
}

.muted {
  margin-top: 1.25rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.btn {
  display: inline-block;
  margin-top: 1.75rem;
  padding: 0.6rem 1.5rem;
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  border-radius: 0.5rem;
  transition: background 0.2s ease, transform 0.1s ease;
}

.btn:hover {
  background: #4338ca;
  transform: translateY(-1px);
}