:root {
  --page-bg-top: #f7fafe;
  --page-bg-bottom: #eef3fb;
  --card-bg-top: #ffffff;
  --card-bg-bottom: #f7faff;
  --card-border: #d3dff0;
  --title: #102a52;
  --text: #254879;
  --muted: #4c6286;
  --accent: #0f4ea5;
  --accent-soft: #3f83f8;
  --badge-bg: #e9f1ff;
  --shadow-main: 0 30px 80px -44px rgba(8, 37, 86, 0.5);
  --shadow-soft: 0 10px 28px rgba(13, 39, 84, 0.09);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: clamp(18px, 4vw, 42px);
  font-family: "Manrope", "Segoe UI", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--page-bg-top), var(--page-bg-bottom));
}

.stub {
  position: relative;
  width: min(720px, 100%);
  padding: clamp(32px, 5vw, 52px);
  border-radius: 22px;
  text-align: center;
  background: linear-gradient(180deg, var(--card-bg-top), var(--card-bg-bottom));
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-main), var(--shadow-soft);
  overflow: hidden;
  animation: card-in 650ms cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.stub::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft), var(--accent));
  background-size: 220% 100%;
  animation: line-shift 6.5s linear infinite;
}

.stub::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 36%, rgba(255, 255, 255, 0.55) 50%, transparent 64%);
  transform: translateX(-140%);
  animation: sheen 5.8s ease-in-out infinite;
  pointer-events: none;
}

.badge {
  margin: 0 auto 18px;
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: clamp(12px, 2.3vw, 14px);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--badge-bg);
  border: 1px solid #c4d7f6;
}

.badge::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(15, 78, 165, 0.42);
  animation: pulse 2s ease-out infinite;
}

h1 {
  margin: 0;
  color: var(--title);
  font-size: clamp(30px, 5.2vw, 52px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.lead {
  margin: clamp(14px, 2.8vw, 22px) auto 10px;
  max-width: 33ch;
  font-size: clamp(18px, 3.2vw, 23px);
  line-height: 1.4;
  color: var(--text);
  text-wrap: pretty;
}

.note {
  margin: 0;
  font-size: clamp(15px, 2.2vw, 17px);
  color: var(--muted);
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes line-shift {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 220% 0;
  }
}

@keyframes sheen {
  0%,
  65% {
    transform: translateX(-140%);
  }
  100% {
    transform: translateX(140%);
  }
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(15, 78, 165, 0.45);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(15, 78, 165, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(15, 78, 165, 0);
  }
}

@media (max-width: 640px) {
  .stub {
    border-radius: 18px;
    padding: 30px 22px;
  }

  .lead {
    max-width: 27ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .stub,
  .stub::before,
  .stub::after,
  .badge::before {
    animation: none;
  }
}