html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  min-height: 100vh;
  min-height: 100dvh;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  transition: background 0.3s, color 0.3s;
  overflow: hidden;
}

:root {
  --bg: #ffffff;
  --fg: #111111;
  --accent: #0078d7;
  --counter-bg: rgba(0, 120, 215, 0.08);
}
[data-theme="dark"] {
  --bg: #0f1113;
  --fg: #eeeeee;
  --accent: #4fc3f7;
  --counter-bg: rgba(79, 195, 247, 0.10);
}

#bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  display: block;
}

#theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 2;
  width: 2.4rem;
  height: 2.4rem;
  padding: 0;
  border: 1px solid var(--accent);
  border-radius: 50%;
  background: var(--counter-bg);
  color: var(--accent);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(6px);
  transition: background 0.2s, color 0.2s, transform 0.2s;
}
#theme-toggle:hover {
  transform: scale(1.08);
}
#theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

main {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem 1rem;
  gap: 3rem;
  pointer-events: none;
}

#greeting {
  margin: 0;
  font-size: clamp(2.5rem, 8vw, 5rem);
  line-height: 1.15;
  letter-spacing: 0.02em;
  text-align: center;
  width: 100%;
  max-width: 900px;
  min-height: calc(1.15em * 2);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-wrap: break-word;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
#greeting.fade-out {
  opacity: 0;
  transform: translateY(-12px);
}

#visitor-counter {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
}
#counter-label {
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  opacity: 0.6;
}
#counter-digits {
  display: flex;
  gap: 0.35rem;
  font-variant-numeric: tabular-nums;
}
.digit {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-width: 1.4rem;
  padding: 0.35rem 0.55rem;
  background: var(--counter-bg);
  border: 1px solid var(--accent);
  border-radius: 0.35rem;
  font-size: 1.25rem;
  font-weight: 600;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--accent);
}

@media (max-width: 600px) {
  main {
    gap: 2rem;
  }
  .digit {
    font-size: 1.05rem;
    min-width: 1.1rem;
    padding: 0.3rem 0.45rem;
  }
}