:root {
  --bg: #2e2f31;
  --body-top: #454749;
  --calc: #d8cec0;
  --calc-edge: #b8ad9d;
  --ink: #2b2924;
  --lcd: #9aa77f;
  --lcd-dark: #2f3a24;
  --key: #efe5d6;
  --key-edge: #c1b5a3;
  --key-action: #dac9b2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Orbitron", "Segoe UI", sans-serif;
  background: linear-gradient(180deg, var(--body-top), var(--bg));
  color: var(--ink);
}

.app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.calculator {
  width: min(520px, 100%);
  background: linear-gradient(160deg, #dfd4c6, var(--calc));
  border-radius: 22px;
  border: 2px solid var(--calc-edge);
  box-shadow: 0 26px 45px rgba(0, 0, 0, 0.35);
  padding: 1rem;
}

.calc-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.8rem;
  margin-bottom: 0.65rem;
}

.branding {
  text-align: left;
}

.model {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.11em;
  color: #645b4f;
}

h1 {
  margin: 0.08rem 0 0;
  font-size: clamp(1.45rem, 5vw, 2rem);
  letter-spacing: 0.09em;
}

.btn {
  padding: 0.38rem 0.62rem;
  border: 1px solid #9e8f7d;
  border-radius: 8px;
  background: #ece1d2;
  color: #322d26;
  font: inherit;
  font-size: 0.64rem;
  line-height: 1;
  cursor: pointer;
}

.lcd {
  background: linear-gradient(180deg, #a7b68a, var(--lcd));
  border: 2px solid #85916d;
  border-radius: 12px;
  padding: 0.7rem;
  box-shadow: inset 0 0 0 2px rgba(43, 58, 31, 0.2);
}

.tape {
  margin: 0;
  padding: 0;
  list-style: none;
  max-height: 170px;
  overflow: auto;
  font-family: "VT323", monospace;
  font-size: 1.55rem;
  color: var(--lcd-dark);
}

.tape li {
  border-bottom: 1px dashed rgba(47, 58, 36, 0.24);
  padding: 0.08rem 0;
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
}

.tape .guess {
  min-width: 3ch;
  letter-spacing: 0.08em;
}

.guess-form {
  margin-top: 0.3rem;
}

.entry-line {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  border-top: 2px solid rgba(43, 58, 31, 0.35);
  padding-top: 0.35rem;
}

.cursor {
  font-family: "VT323", monospace;
  font-size: 1.55rem;
  color: var(--lcd-dark);
}

#guessInput {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--lcd-dark);
  font-family: "VT323", monospace;
  font-size: 1.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

#guessInput:focus-visible {
  outline: none;
}

.message {
  margin: 0.2rem 0 0;
  font-size: 0.72rem;
  color: rgba(47, 58, 36, 0.95);
}

.status-row {
  margin-top: 0.5rem;
}

.badge {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  color: #4e453a;
}

.keypad {
  margin-top: 0.65rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
}

.key {
  border: 1px solid var(--key-edge);
  border-radius: 12px;
  background: var(--key);
  color: #2a2520;
  font: inherit;
  font-size: 1rem;
  padding: 0.7rem 0.4rem;
  cursor: pointer;
  box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.12);
}

.key:active {
  transform: translateY(1px);
}

.key.action {
  background: var(--key-action);
}

.legend {
  margin-top: 0.8rem;
  border-top: 1px solid rgba(0, 0, 0, 0.12);
  padding-top: 0.65rem;
}

h2 {
  margin: 0 0 0.35rem;
  font-size: 0.82rem;
}

.legend ul {
  margin: 0;
  padding-left: 1rem;
  font-family: "VT323", monospace;
  font-size: 1.2rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  border: 0;
  padding: 0;
  white-space: nowrap;
  clip-path: inset(50%);
  clip: rect(0 0 0 0);
  overflow: hidden;
}