:root {
  --bg: #0f1c24;
  --bg-glow: #16323f;
  --accent: #4ecdc4;
  --ink: #e8f1f2;
  --muted: #8fa8b2;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3rem;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, var(--bg-glow) 0%, transparent 70%),
    var(--bg);
  color: var(--ink);
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  text-align: center;
  padding: 2rem;
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.mark {
  width: 104px;
  height: 104px;
  color: var(--accent);
  animation: breathe 5s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% { opacity: .85; transform: scale(1); }
  50%      { opacity: 1;   transform: scale(1.04); }
}

@media (prefers-reduced-motion: reduce) {
  .mark { animation: none; }
}

h1 {
  font-size: clamp(2.75rem, 9vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
}

.tagline {
  font-size: clamp(1.05rem, 3vw, 1.35rem);
  color: var(--accent);
  letter-spacing: 0.02em;
}

.note {
  max-width: 34rem;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

footer {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
  font-size: 0.85rem;
  color: var(--muted);
}

footer a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

footer a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.dot {
  opacity: 0.4;
}