:root{
  --bg: #0b0b0b;
  --fg: #f5f5f5;
  --muted: rgba(245,245,245,.72);
  --line: rgba(245,245,245,.18);
  --lineStrong: rgba(245,245,245,.38);
  --radius: 999px;
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }

body{
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  letter-spacing: 0.02em;
}

/* Layout */
.wrap{
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 32px 18px;
}

.card{
  width: min(720px, 100%);
  text-align: center;
  padding: 56px 22px;
}

h1{
  margin: 0 0 26px;
  font-weight: 450;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.02;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hint{
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.divider{
  width: min(320px, 72%);
  height: 1px;
  background: var(--line);
  margin: 18px auto 28px;
}

/* Button */

button {
  cursor: pointer;
} 

.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: transparent;
  color: var(--fg);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: transform .16s ease, background .16s ease, border-color .16s ease;
  outline: none;
}

.btn:hover{
  background: rgba(245,245,245,.06);
  border-color: var(--lineStrong);
  transform: translateY(-1px);
}

.btn:active{ transform: translateY(0); }

.btn:focus-visible{
  box-shadow: 0 0 0 3px rgba(245,245,245,.18);
}

/* Corner */
.corner{
  position: fixed;
  left: 16px;
  bottom: 14px;
  color: rgba(245,245,245,.35);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  user-select: none;
}

@media (prefers-reduced-motion: reduce){
  .btn{ transition: none; }
  .btn:hover{ transform: none; }
}