:root {
  --bg: #f6f1e7;
  --ink: #221d17;
  --muted: #6d6456;
  --accent: #b4532a;
  --line: rgba(34, 29, 23, .17);
  --field: rgba(255, 255, 255, .72);
  --border: rgba(34, 29, 23, .24);
  --on-accent: #fff;
  --danger: #a4262c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17140f;
    --ink: #f2ebdd;
    --muted: #a79d8c;
    --accent: #e58a5c;
    --line: rgba(242, 235, 221, .14);
    --field: rgba(23, 20, 15, .78);
    --border: rgba(242, 235, 221, .26);
    --on-accent: #17140f;
    --danger: #ff8f86;
  }
}
* { box-sizing: border-box; margin: 0; }
html, body { height: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  overflow: hidden;
}
canvas { position: fixed; inset: 0; width: 100%; height: 100%; }
main {
  position: relative;
  z-index: 1;
  width: min(23rem, calc(100vw - 2.5rem));
  text-align: center;
  transition: opacity .5s ease, transform .5s ease;
}
main.leaving { opacity: 0; transform: scale(.97); }
h1 {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-weight: 400;
  font-size: clamp(3.25rem, 11vw, 4.75rem);
  line-height: 1;
  letter-spacing: -.02em;
  margin-bottom: 1.5rem;
}
h1 span { color: var(--accent); }
.lead { color: var(--muted); margin-bottom: 1.5rem; line-height: 1.45; text-wrap: balance; }
form { display: grid; gap: .875rem; animation: rise .45s cubic-bezier(.2, .8, .2, 1); }
form[hidden] { display: none; }
@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
}
label { display: grid; gap: .375rem; text-align: left; }
label span { font-size: .875rem; color: var(--muted); }
input {
  width: 100%;
  min-height: 2.875rem;
  padding: .625rem .875rem;
  font: inherit;
  color: inherit;
  background: var(--field);
  border: 1px solid var(--border);
  border-radius: .625rem;
  backdrop-filter: blur(6px);
  transition: border-color .15s ease, box-shadow .15s ease;
}
input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 28%, transparent);
}
button {
  min-height: 2.875rem;
  margin-top: .375rem;
  font: inherit;
  font-weight: 600;
  color: var(--on-accent);
  background: var(--accent);
  border: 0;
  border-radius: .625rem;
  cursor: pointer;
  transition: transform .15s ease, filter .15s ease;
}
button:hover { filter: brightness(1.08); }
button:active { transform: scale(.98); }
button:disabled { opacity: .6; cursor: progress; }
button:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
button.ghost { background: transparent; color: var(--muted); font-weight: 400; }
.digits { display: grid; grid-template-columns: repeat(6, 1fr); gap: .5rem; }
.digits input {
  padding: 0;
  text-align: center;
  font-size: 1.375rem;
  font-variant-numeric: tabular-nums;
  min-height: 3.25rem;
}
.digits input.filled { border-color: var(--accent); }
.digits.shake { animation: shake .36s ease; }
@keyframes shake {
  20%, 60% { transform: translateX(-7px); }
  40%, 80% { transform: translateX(7px); }
}
#message { min-height: 1.5rem; margin-top: 1rem; color: var(--danger); font-size: .9375rem; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}