:root {
  color-scheme: light;
  --ink: #142033;
  --muted: #5e6a7d;
  --paper: #f7f9fc;
  --line: #d8e0eb;
  --blue: #2468d8;
  --cyan: #48c6d8;
  --amber: #d28a16;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background:
    linear-gradient(120deg, rgba(36, 104, 216, 0.12), transparent 34%),
    linear-gradient(230deg, rgba(72, 198, 216, 0.14), transparent 42%),
    var(--paper);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.panel {
  width: min(100%, 420px);
  padding: 34px 28px 30px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 60px rgba(24, 43, 73, 0.12);
}

.mark {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--blue);
  color: var(--white);
  font-size: 16px;
  font-weight: 800;
}

.mark.warn {
  background: var(--amber);
}

.eyebrow {
  margin: 22px 0 10px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(28px, 8vw, 38px);
  line-height: 1.08;
  letter-spacing: 0;
}

.copy {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.signal {
  display: flex;
  gap: 8px;
  margin: 26px 0 18px;
}

.signal span {
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: var(--line);
  overflow: hidden;
}

.signal span::after {
  content: "";
  display: block;
  height: 100%;
  width: 55%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  animation: sweep 1.1s ease-in-out infinite;
}

.signal span:nth-child(2)::after {
  animation-delay: 0.12s;
}

.signal span:nth-child(3)::after {
  animation-delay: 0.24s;
}

.target {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.button {
  width: 100%;
  margin-top: 24px;
  padding: 13px 16px;
  border: 0;
  border-radius: 6px;
  background: var(--blue);
  color: var(--white);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.button:focus-visible {
  outline: 3px solid rgba(36, 104, 216, 0.28);
  outline-offset: 3px;
}

.cloak {
  width: 35em;
  max-width: calc(100vw - 48px);
  margin: 10vh auto;
  font-family: Tahoma, Verdana, Arial, sans-serif;
}

@keyframes sweep {
  0% {
    transform: translateX(-110%);
  }
  100% {
    transform: translateX(210%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .signal span::after {
    animation: none;
    transform: none;
    width: 100%;
  }
}