*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: #111;
  color: #e8e8e8;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-font-smoothing: antialiased;
}
main { padding: 2rem; max-width: 360px; }
h1 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: #fff;
}
p {
  margin-top: 0.625rem;
  font-size: 0.9375rem;
  line-height: 1.55;
  color: #888;
}
a {
  color: #888;
  text-decoration: none;
  transition: color 0.15s;
}
p a { color: #bbb; }
p a:hover, nav a:hover { color: #fff; }
nav {
  margin-top: 1.5rem;
  display: flex;
  gap: 1.25rem;
  font-size: 0.8125rem;
}
.row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.heart {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem 0.25rem 0.45rem;
  border: 0;
  border-radius: 32px;
  background: #232326;
  cursor: pointer;
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: #f5f5f5;
}
.heart svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: #8b8b93;
  stroke-width: 2;
  stroke-linejoin: round;
  transform-origin: center;
  animation: beat 1.6s infinite;
}
.heart.on svg {
  fill: #ff4d6d;
  stroke: #ff4d6d;
  animation: pop 560ms cubic-bezier(0.34, 1.7, 0.64, 1);
}
#hearts {
  display: inline-block;
  animation: roll 350ms;
}
@keyframes beat {
  0%, 30%, 100% { transform: scale(1); }
  15% { transform: scale(1.03); }
}
@keyframes pop {
  0% { transform: scale(1); }
  45% { transform: scale(1.25); }
  100% { transform: scale(1); }
}
@keyframes roll {
  from { transform: translateY(0.45em); opacity: 0; }
  to { transform: none; opacity: 1; }
}
@media (prefers-reduced-motion: reduce) { .heart svg, #hearts { animation: none; } }