:root {
  color-scheme: dark;
  --bg: #14161c;
  --fg: #e7e9ee;
  --dim: #9aa0ae;
  --line: #333949;
  --accent: #d8a24a;
  --error: #e2685f;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main {
  width: 100%;
  max-width: 22rem;
  text-align: center;
}
h1 {
  margin: 0 0 0.25rem;
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
p {
  margin: 0 0 1.5rem;
  color: var(--dim);
}
form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
input,
button {
  font: inherit;
  padding: 0.7rem 0.9rem;
  border-radius: 0.5rem;
  border: 1px solid var(--line);
}
input {
  background: #1c1f27;
  color: var(--fg);
  text-align: center;
  letter-spacing: 0.12em;
}
input:focus {
  outline: none;
  border-color: var(--accent);
}
button {
  border-color: transparent;
  background: var(--accent);
  color: #1a1206;
  font-weight: 600;
  cursor: pointer;
}
button:disabled {
  opacity: 0.5;
  cursor: default;
}
#error {
  margin: 1rem 0 0;
  color: var(--error);
  min-height: 1.5rem;
}
#error:empty {
  visibility: hidden;
}