body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: #f3f7ff; color: #1e293b; font-family: system-ui, sans-serif; }
main { padding: 48px 28px; text-align: center; }
.tag { color: #2563eb; font-size: 12px; letter-spacing: 3px; }
h1 { font-size: clamp(28px, 5vw, 48px); }
p { color: #64748b; line-height: 1.8; }
button { margin-top: 20px; padding: 12px 22px; border: 0; border-radius: 8px; color: white; background: #2563eb; cursor: pointer; }