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

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #0f2027,#134e5e,#2c5364);
  font-family: 'Segoe UI', sans-serif;
}

.calculator {
  background: rgba(199, 84, 170, 0.05);
  backdrop-filter: blur(20px);
  padding: 25px;
  border-radius: 20px;
  width: 320px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.5);
  position: relative;
  padding-top: 35px; /*space for name*/
}

/* DISPLAY */
.display {
  background: rgba(0,0,0,0.4);
  border-radius: 12px;
  padding: 10px 15px;
  margin-bottom: 20px;
  color: white;
  height: 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

#history {
  font-size: 14px;
  opacity: 0.6;
  text-align: right;
}

#result {
  text-align: right;
  font-weight: bold;
  font-size: 32px;
  font-weight: 600;
  overflow: hidden;
  word-wrap: break-word;
  font-size: clamp(18px, 5vw, 30px);
}

/* BUTTON GRID */
.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

button {
  padding: 18px;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  cursor: pointer;
  background: rgba(255,255,255,0.08);
  color: white;
  transition: all 0.2s ease;
}

button:hover {
  transform: translateY(-2px);
  background: rgba(255,255,255,0.15);
}

button:active {
  transform: scale(0.95);
}

/* Operators */
.operator {
  background: #f59e0b;
}

.operator:hover {
  background: #d97706;
}

/* Equal */
.equal {
  grid-column: span 2;
  background: #10b981;
}

.equal:hover {
  background: #059669;
}

/* Clear */
.clear {
  background: #ef4444;
}

.clear:hover {
  background: #dc2626;
}
.brand-box {
  background: #e94963;
  grid-column: span 2;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 12px;
  font-weight: bold;
  font-size: 15px;
  letter-spacing: 1px;
}
.brand-box:hover {
   background: #059669;
   transform: translateY(-2px);
}