* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}
body {
  margin: 0;
  background: #fff;
  color: #252525;
  font-family: system-ui, sans-serif;
}
main {
  width: min(420px, calc(100% - 40px));
  margin: min(16vh, 140px) auto 40px;
  padding: 24px;
  border: 1px solid #e6e7e9;
  border-radius: 20px;
  box-shadow: 0 8px 32px #292b2e05;
}
form,
#group-picker,
#group-buttons {
  display: grid;
  gap: 12px;
}
[hidden] {
  display: none !important;
}
label,
#group-label {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
}
input {
  width: 100%;
  min-width: 0;
  border: 1px solid #d9dde1;
  border-radius: 10px;
  padding: 14px;
  font: inherit;
  font-size: 24px;
  letter-spacing: 8px;
  text-align: center;
}
input:focus-visible,
button:focus-visible {
  outline: 2px solid #896547;
  outline-offset: 3px;
}
button {
  border: 0;
  border-radius: 10px;
  background: #896547;
  color: #fff;
  padding: 13px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
button:hover {
  background: #6c4931;
}
button:disabled {
  opacity: 0.6;
  cursor: wait;
}
#login-error {
  margin: 12px 0 0;
  color: #b13c3c;
  font-size: 13px;
  line-height: 1.5;
}
#login-error:empty {
  display: none;
}
#login-back {
  background: #f2f2f2;
  color: #555;
}
#login-back:hover {
  background: #e8e8e8;
}