* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Playfair Display', serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: #c8a882;
}

#wrapper {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

#calculator {
  background: #f5ebe0;
  border-radius: 12px;
  padding: 24px;
  width: 320px;
  box-shadow: 0 8px 30px rgba(90, 55, 20, 0.25);
}

#display {
  background: #fff8f0;
  border-radius: 8px;
  padding: 16px 16px 12px;
  text-align: right;
  margin-bottom: 20px;
  border: 1px solid #d9c0a3;
}

#expression {
  font-size: 1rem;
  min-height: 1.4rem;
  color: #b08060;
}

#result {
  font-size: 2.8rem;
  font-weight: 700;
  color: #3d1f0a;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

button {
  padding: 18px;
  font-size: 1.1rem;
  font-family: 'Playfair Display', serif;
  font-weight: 600;
  border: 1px solid #d9c0a3;
  border-radius: 8px;
  cursor: pointer;
  background: #fff8f0;
  color: #3d1f0a;
  transition: all 0.15s ease;
}

button:hover {
  background: #eedfc8;
}

button:active {
  background: #e0cdb0;
  transform: translateY(1px);
}

.operator {
  background: #e8d5b8;
  color: #7a4419;
}

.operator:hover {
  background: #d9c0a0;
}

button:first-child {
  background: #7a4419;
  color: #f5ebe0;
  border-color: #7a4419;
}

button:first-child:hover {
  background: #5c3010;
}

#equals {
  background: #a0522d;
  color: #f5ebe0;
  border-color: #a0522d;
  font-size: 1.3rem;
}

#equals:hover {
  background: #7a4019;
}

#history {
  background: #f5ebe0;
  border-radius: 12px;
  padding: 16px;
  width: 200px;
  box-shadow: 0 8px 30px rgba(90, 55, 20, 0.25);
  max-height: 420px;
  overflow-y: auto;
}

#history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  color: #3d1f0a;
  font-weight: 700;
  font-size: 1rem;
}

#clear-history-btn {
  padding: 6px 12px;
  font-size: 0.75rem;
  background: #7a4419;
  color: #f5ebe0;
  border: none;
  border-radius: 6px;
  font-family: 'Playfair Display', serif;
  cursor: pointer;
}

#clear-history-btn:hover {
  background: #5c3010;
  transform: none;
}

#history-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

#history-list li {
  font-size: 0.95rem;
  color: #7a4419;
  padding: 6px 10px;
  background: #fff8f0;
  border-radius: 6px;
  border: 1px solid #d9c0a3;
  word-break: break-all;
}

#empty-history {
  color: #b08060;
  font-style: italic;
  text-align: center;
  border: none !important;
  background: transparent !important;
}