* {
  box-sizing: border-box;
}

:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #667085;
  --accent: #4f46e5;
  --surface: #ffffff;
  --background: #f3f5fb;
  --border: #e6e8f0;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 10%, rgba(79, 70, 229, 0.12), transparent 32rem),
    radial-gradient(circle at 90% 90%, rgba(14, 165, 233, 0.10), transparent 28rem),
    var(--background);
}

.container {
  width: min(100% - 32px, 760px);
  min-height: 100vh;
  margin: 0 auto;
  display: grid;
  place-items: center;
  padding: 40px 0;
}

.card {
  width: 100%;
  padding: clamp(28px, 6vw, 56px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: 0 24px 70px rgba(23, 32, 51, 0.08);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

h1 {
  margin: 0;
  font-size: clamp(2.25rem, 7vw, 3.5rem);
  letter-spacing: -0.055em;
  line-height: 1.05;
}

.intro {
  max-width: 540px;
  margin: 18px 0 32px;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.75;
}

.notice {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #fafaff;
}

.notice h2 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.notice p {
  margin: 0 0 18px;
  color: var(--muted);
  line-height: 1.65;
}

.notice a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 17px;
  color: #fff;
  background: var(--accent);
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
}

.notice a:hover {
  background: #3730a3;
}

footer {
  margin-top: 34px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 480px) {
  .card { border-radius: 18px; }
  .notice { padding: 20px; }
}