body {
  background: linear-gradient(135deg, #1e2024, #17181c);
  padding: 2.5vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.calculator-container {
  display: flex;
  flex-direction: row;
  gap: 25px;
  background: #2d2f38;
  border-radius: 30px;
  padding: 20px; /* Reduced from 30px */
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
  width: auto;
  max-width: 900px;
  max-height: 600px; /* Added max-height */
}

.calculator {
  padding: 20px; /* Reduced padding */
  width: 350px;
  max-width: 100%;
}

.display {
  background: #17181c;
  padding: 20px;
  border-radius: 15px;
  margin-bottom: 15px;
  min-height: 100px;
  box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.5);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.previous-operand {
  color: rgba(255, 255, 255, 0.6);
  font-size: 1.2rem;
  min-height: 24px;
  margin-bottom: 5px;
  text-align: right;
  opacity: 0.8;
  transition: all 0.3s;
}

.current-operand {
  color: #fff;
  font-size: 2.8rem;
  font-weight: 500;
  text-align: right;
  letter-spacing: 2px;
  line-height: 1.3;
  text-shadow: 0 0 5px rgba(255, 255, 255, 0.2);
  overflow-wrap: break-word;
  word-break: break-all;
  max-width: 100%;
}

.keypad,
.scientific-functions {
  gap: 8px; /* Reduced from 12px */
}

button {
  height: 55px; /* Reduced from 65px */
  padding: 10px; /* Added compact padding */
}

.history-panel {
  max-height: 500px; /* Adjusted to match new container height */
  overflow-y: auto;
}

.previous-operand {
  color: #a0a0a0;
  font-size: 1.4rem;
  min-height: 30px;
  margin-bottom: 10px;
  text-align: right;
  word-wrap: break-word;
  word-break: break-all;
}

.current-operand {
  color: #fff;
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-align: right;
  word-wrap: break-word;
  word-break: break-all;
  line-height: 1.2;
}

.scientific-functions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  padding: 5px;
  margin-top: 15px;
}

button {
  height: 50px;
  width: 100%;
  border-radius: 12px;
  font-size: 1.3rem;
  padding: 8px;
}

.equals {
  grid-row: span 2;
  height: 110px;
}

.zero {
  grid-column: span 2;
}

button {
  border-radius: 16px;
  border: none;
  font-size: 1.4rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.number {
  background: #2d2f38;
  color: #fff;
  box-shadow: -5px -5px 10px rgba(255, 255, 255, 0.05),
    5px 5px 10px rgba(0, 0, 0, 0.2);
}

.number:hover {
  background: #35373f;
}

.operator {
  background: #ff9500;
  color: #fff;
}

.operator:hover {
  background: #ffaa33;
}

.equals {
  background: linear-gradient(135deg, #00c6fb, #005bea);
  color: #fff;
}

.equals:hover {
  background: linear-gradient(135deg, #00d4ff, #0066ff);
}

.clear {
  background: #ff375f;
  color: #fff;
}

.clear:hover {
  background: #ff4d6d;
}

.delete {
  background: #ff375f;
  color: #fff;
}

.sci-btn {
  background: #5856d6;
  color: #fff;
}

.sci-btn:hover {
  background: #6a67ff;
}

.history-panel {
  background: #2d2f38;
  border-radius: 20px;
  padding: 20px;
  width: 300px;
  height: fit-content;
  max-height: 600px;
  overflow-y: auto;
  box-shadow: -5px -5px 10px rgba(255, 255, 255, 0.05),
    5px 5px 10px rgba(0, 0, 0, 0.2);
  display: none;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.clear-history {
  background: transparent;
  color: #ff375f;
  box-shadow: none;
  height: auto;
  width: auto;
  padding: 5px 10px;
}

@media (max-width: 768px) {
  .history-panel {
    width: auto;
    padding: 0;
    max-height: 250px;
    margin: 10px 0;
    border-radius: 15px;
  }

  .history-item {
    padding: 12px;
    margin: 8px 0;
    font-size: 0.9rem;
  }

  .history-header {
    padding: 15px;
    margin-bottom: 10px;
  }

  .history-header h3 {
    font-size: 1.1rem;
  }

  .clear-history {
    padding: 3px 8px;
    font-size: 1rem;
  }
}

@media (max-width: 320px) {
  .history-panel {
    padding: 10px;
    max-height: 200px;
  }

  .history-item {
    padding: 10px;
    margin: 6px 0;
    font-size: 0.85rem;
  }
}

.history-panel.show {
  display: block;
}

@media (max-width: 900px) {
  .calculator-container {
    flex-direction: column;
    width: 95%;
    margin: 10px;
  }

  .history-panel {
    width: 100%;
    margin-top: 20px;
  }
}

.history-header {
  color: #fff;
  padding-bottom: 15px;
  border-bottom: 1px solid #3d3f48;
}

.history-item {
  background: #35373f;
  padding: 15px;
  margin: 10px 0;
  border-radius: 12px;
  color: #fff;
}

.history-item:hover {
  background: #3d3f48;
}

@media (max-width: 768px) {
  body {
    padding: 1vh;
  }

  .calculator-container {
    width: 100%;
    margin: 0;
    padding: 15px;
    max-height: none;
  }

  .calculator {
    width: 100%;
    padding: 0;
  }

  .display {
    padding: 15px;
    min-height: 90px;
    margin-bottom: 10px;
  }

  .current-operand {
    font-size: 1.8rem;
    line-height: 1.2;
    margin-top: 5px;
  }

  .previous-operand {
    font-size: 1rem;
    min-height: 20px;
    margin-bottom: 2px;
  }
}

@media (max-width: 320px) {
  .display {
    padding: 12px;
    min-height: 80px;
  }

  .current-operand {
    font-size: 1.6rem;
  }

  .previous-operand {
    font-size: 0.9rem;
  }
}

.history-list {
  position: relative;
  min-height: 100px;
  padding: 10px;
}

.history-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  color: #666;
  text-align: center;
}

.history-empty-state i {
  font-size: 2rem;
  margin-bottom: 10px;
  opacity: 0.7;
}

.history-empty-state p {
  margin: 0;
  font-size: 0.9rem;
}

.history-items-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

@media (max-width: 768px) {
  .history-empty-state {
    padding: 15px;
  }

  .history-empty-state i {
    font-size: 1.5rem;
  }

  .history-empty-state p {
    font-size: 0.8rem;
  }
}