* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background:
    radial-gradient(ellipse 80% 55% at 50% 35%, #152033 0%, #0b1018 70%, #070a0f 100%);
  color: #e8eef7;
}
body {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 2rem;
}
main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  text-align: center;
}
.logo {
  width: min(340px, 78vw);
  height: auto;
  display: block;
  filter: drop-shadow(0 12px 28px rgba(0,0,0,.45));
}
.tagline {
  margin: 0;
  font-size: clamp(1.35rem, 3.5vw, 1.85rem);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  background: linear-gradient(110deg, #7dd3e8 0%, #e8eef7 45%, #5ec4c0 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: none;
  filter: drop-shadow(0 0 18px rgba(94,196,192,.35));
  animation: shimmer 5s ease-in-out infinite;
}
@keyframes shimmer {
  0%, 100% { filter: drop-shadow(0 0 14px rgba(94,196,192,.28)); letter-spacing: 0.18em; }
  50% { filter: drop-shadow(0 0 26px rgba(125,211,232,.5)); letter-spacing: 0.22em; }
}
.donate {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.4rem;
  padding: 0.65rem 1.25rem;
  border-radius: 999px;
  border: 1px solid rgba(94,196,192,.35);
  color: #9bb0c0;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: color .2s, border-color .2s, background .2s;
}
.donate:hover {
  color: #e8eef7;
  border-color: #5ec4c0;
  background: rgba(94,196,192,.08);
}