:root {
  color-scheme: light dark;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

body {
  margin: 0;
  background: radial-gradient(circle at top, #f5f5f5, #e4e4e4);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #222;
}

.container {
  background: rgba(255, 255, 255, 0.9);
  border-radius: 16px;
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.2);
  padding: 48px;
  width: min(90%, 640px);
}

h1 {
  margin-top: 0;
  font-size: clamp(2.5rem, 6vw, 3.25rem);
  letter-spacing: -0.04em;
}

h2 {
  margin-top: 48px;
  font-size: clamp(1.5rem, 4vw, 2rem);
}

p {
  font-size: 1.125rem;
  color: #475569;
}

button,
input,
a {
  font-size: 1rem;
}

button {
  cursor: pointer;
  border: none;
  border-radius: 999px;
  padding: 0.75rem 1.5rem;
  margin: 1rem 1rem 1rem 0;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
  box-shadow: 0 15px 35px rgba(99, 102, 241, 0.35);
  transition: transform 150ms ease, box-shadow 150ms ease;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px rgba(99, 102, 241, 0.4);
}

input {
  border: 1px solid rgba(148, 163, 184, 0.6);
  border-radius: 12px;
  padding: 0.75rem 1rem;
  margin: 0.75rem 0 1.25rem;
  width: min(100%, 320px);
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

input:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
  outline: none;
}

a {
  color: #6366f1;
  text-decoration: none;
  font-weight: 600;
}

a:hover {
  text-decoration: underline;
}