.calculator-body {
  min-height: 100vh;
}

.calculator-shell {
  width: min(980px, 92vw);
  margin: 2rem auto;
  display: grid;
  gap: 1.25rem;
}

.calculator-header {
  text-align: center;
}

.back-link {
  display: inline-flex;
  margin-bottom: 1rem;
  color: var(--green);
  text-decoration: none;
  font-family: "Orbitron", sans-serif;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.calculator-header h1 {
  margin: 0;
  font-family: "Orbitron", sans-serif;
  font-size: clamp(2rem, 6vw, 4rem);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.calculator-header p {
  margin: 0.65rem auto 0;
  max-width: 620px;
  color: #c6ccd8;
  font-size: 1.1rem;
  line-height: 1.35;
}

.calculator-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.86fr);
  gap: 1rem;
  border: 1px solid rgba(111, 255, 52, 0.22);
  border-radius: 20px;
  background:
    linear-gradient(135deg, rgba(13, 17, 23, 0.98), rgba(6, 8, 11, 0.96)),
    radial-gradient(circle at 15% 15%, rgba(111, 255, 52, 0.12), transparent 36%);
  box-shadow:
    0 26px 70px rgba(0, 0, 0, 0.55),
    inset 0 0 0 1px rgba(255, 255, 255, 0.03);
  padding: 1rem;
}

.calculator-form {
  display: grid;
  gap: 0.9rem;
}

.calculator-form label {
  display: grid;
  gap: 0.32rem;
}

.calculator-form span,
.price-readout span,
.result-label,
.result-panel dt {
  font-family: "Orbitron", sans-serif;
  color: var(--muted);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.calculator-form input {
  width: 100%;
  border: 1px solid rgba(215, 217, 225, 0.14);
  border-radius: 12px;
  background: rgba(6, 8, 12, 0.82);
  color: var(--text);
  padding: 0.78rem 0.85rem;
  font: 700 1.08rem "Rajdhani", sans-serif;
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.calculator-form input:focus {
  border-color: rgba(111, 255, 52, 0.58);
  box-shadow: 0 0 0 3px rgba(111, 255, 52, 0.09);
}

.target-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}

.price-readout {
  border: 1px solid rgba(215, 217, 225, 0.1);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.035);
  padding: 0.8rem;
}

.price-readout strong {
  display: block;
  margin-top: 0.18rem;
  font-family: "Orbitron", sans-serif;
  font-size: 1.7rem;
  color: #f7f8ff;
}

.price-readout small {
  color: rgba(198, 204, 216, 0.72);
}

.calculator-form button {
  border: 0;
  border-radius: 999px;
  padding: 0.86rem 1rem;
  color: #071007;
  background: linear-gradient(180deg, #87ff5d, #50d323);
  font-family: "Orbitron", sans-serif;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 16px 30px rgba(111, 255, 52, 0.22);
}

.result-panel {
  border: 1px solid rgba(215, 217, 225, 0.12);
  border-radius: 18px;
  background:
    radial-gradient(circle at 50% 0%, rgba(111, 255, 52, 0.15), transparent 42%),
    rgba(6, 8, 12, 0.86);
  padding: 1rem;
  display: grid;
  align-content: center;
  gap: 0.85rem;
}

.result-panel strong {
  font-family: "Orbitron", sans-serif;
  font-size: clamp(2.5rem, 8vw, 4.6rem);
  line-height: 1;
  color: var(--green);
  text-shadow: 0 0 24px rgba(111, 255, 52, 0.24);
}

.result-panel p {
  margin: 0;
  color: #d9dee8;
  font-size: 1.05rem;
}

.result-panel dl {
  margin: 0;
  display: grid;
  gap: 0.55rem;
}

.result-panel dl div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  padding-top: 0.55rem;
}

.result-panel dd {
  margin: 0;
  font-weight: 800;
  color: var(--silver);
}

.result-panel[data-state="error"] strong {
  color: #ff6b78;
  text-shadow: 0 0 18px rgba(255, 38, 56, 0.24);
}

@media (max-width: 760px) {
  .calculator-card,
  .target-grid {
    grid-template-columns: 1fr;
  }
}