:root {
  --bg: #fbfbfd;
  --fg: #1d1d1f;
  --muted: #86868b;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --border: #d2d2d7;
  --hover: #f5f5f7;
  --hover-brd: #c7c7cc;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #f5f5f7;
    --muted: #86868b;
    --accent: #0071e3;
    --accent-hover: #0077ed;
    --border: #424245;
    --hover: #1c1c1e;
    --hover-brd: #545458;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
               "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

main {
  text-align: center;
  max-width: 640px;
  width: 100%;
}

h1 {
  font-size: clamp(2.6rem, 9vw, 4.6rem);
  font-weight: 600;
  letter-spacing: -.03em;
  line-height: 1.04;
  animation: fade .9s ease both;
}

.sub {
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-weight: 400;
  line-height: 1.45;
  color: var(--muted);
  margin: 1.1rem auto 2.6rem;
  animation: fade .9s ease .1s both;
}

.mail {
  display: inline-block;
  font-size: clamp(1.05rem, 3vw, 1.2rem);
  font-weight: 400;
  letter-spacing: -.01em;
  color: #fff;
  text-decoration: none;
  background: var(--accent);
  padding: .85em 1.7em;
  border-radius: 980px;
  transition: background .25s ease, transform .25s ease;
  animation: fade .9s ease .2s both;
}

.mail:hover { background: var(--accent-hover); transform: scale(1.03); }
.mail:active { transform: scale(.99); }

.copy {
  display: inline-block;
  margin: 1.1rem auto 0;
  font: inherit;
  font-size: clamp(.95rem, 2.6vw, 1.05rem);
  font-weight: 400;
  letter-spacing: -.01em;
  color: var(--fg);
  background: none;
  border: 1px solid var(--border);
  padding: .7em 1.6em;
  border-radius: 980px;
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease, transform .2s ease;
}

.copy[hidden] { display: none; }
.copy:hover { background: var(--hover); border-color: var(--hover-brd); transform: scale(1.03); }
.copy:active { transform: scale(.99); }

.copied {
  display: block;
  height: 1.1rem;
  margin-top: .5rem;
  font-size: .85rem;
  color: var(--muted);
}

@keyframes fade {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  h1, .sub, .mail { animation: none; }
}