@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');



:root[data-theme="light"]{
  --bg: #F0F0F3;
  --shadow-light: #ffffff;
  --shadow-dark: #c7c7c7;
  --accent: #6231FF;
  --text: #222;
  --result-display:#2a2a2a;

}

:root[data-theme = "dark"]{
  --bg: #181818;
  --shadow-light: #2a2a2a;
  --shadow-dark: #0f0f0f;
  --accent: #FFB11B;
  --text: #eee;
  --result-display: #c7c7c7;
}

* {
  box-sizing: border-box;
  font-family: 'Inter', sans-serif;
}

body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: var(--bg);
  flex-direction: column;
}


.theme-switch {
  position: absolute;
top: 20px;
right: 20px;
  padding: 8px 12px;
  border: none;
  border-radius: 10px;
  background: var(--bg);
  box-shadow: 6px 6px 10px var(--shadow-dark),
              -6px -6px 10px var(--shadow-light);
  color: var(--text);
  cursor: pointer;
}

.theme-switch button:hover {
  box-shadow: inset 6px 6px 10px var(--shadow-dark),
              inset -6px -6px 10px var(--shadow-light);
}

.calculator {
  position: relative;
  top:2.3rem;
  width: 360px;
  padding: 25px;
  border-radius: 30px;
  background: var(--bg);
  box-shadow: 12px 12px 24px var(--shadow-dark),
              -12px -12px 24px var(--shadow-light);
}

.display {
  height: 90px;
  border-radius: 20px;
  padding: 15px;
  margin-bottom: 20px;
  background: var(--bg);
  box-shadow: inset 8px 8px 16px var(--shadow-dark),
              inset -8px -8px 16px var(--shadow-light);

  overflow: hidden;    

}

.previous-operand::-webkit-scrollbar,
.result-display::-webkit-scrollbar {
  display: none; 
}

.previous-operand {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);

  white-space: nowrap;    
  overflow-x: auto;       
  overflow-y: hidden;       
  max-width: 100%;        
  padding-right: 10px;
  scrollbar-width: none;
}

.current-operator {
  font-size: 18px;
  color: var(--accent);
}

.current-operand {
  font-size: 14px;
  color: var(--text);
  opacity: 0.7;
  
}

.result-display {
  height: 40px;
  margin-bottom: 15px;
  padding: 0.5rem;
  color: var(--result-display);
  border-radius: 12px;
  background: var(--bg);
  box-shadow: inset 6px 6px 12px var(--shadow-dark),
              inset -6px -6px 12px var(--shadow-light);

  white-space: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}

.basic-buttons{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
}

.btn {
  border: none;
  cursor: pointer;
  font-size: 18px;
  padding: 18px;
  border-radius: 40%;
  background: var(--bg);
  box-shadow: 8px 8px 16px var(--shadow-dark),
              -8px -8px 16px var(--shadow-light);
  color: var(--text);
}

.btn:hover {
  box-shadow: inset 8px 8px 16px var(--shadow-dark),
              inset -8px -8px 16px var(--shadow-light);
}

.control {
  border-radius: 20px;
  color: var(--accent);
}

.operator {
  color: var(--accent);
  font-weight: 600;
}

.number {
  font-weight: 600;
}

.zero {
  grid-column: span 1;
  border-radius: 25px;
}

.equals {
  grid-column: span 2;
  border-radius: 30px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  box-shadow: 8px 8px 16px rgba(0,0,0,0.2),
              -8px -8px 16px rgba(255,255,255,0.15);
}

.equals:hover {
  box-shadow: inset 8px 8px 16px rgba(0,0,0,0.2),
              inset -8px -8px 16px rgba(255,255,255,0.15);
}