/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: linear-gradient(145deg, #1e1e1e, #121212);
}

/* Calculator Container */
.container {
  width: 300px;
  max-width: 90%;
  padding: 20px;
  border-radius: 20px;
  background: rgba(30, 30, 30, 0.85);
  box-shadow: 8px 8px 16px #0e0e0e, -8px -8px 16px #2e2e2e;

}

/* Result Box */
.result-box {
  margin-bottom: 20px;
}

.result-box input {
  width: 100%;
  padding: 15px;
  font-size: 2rem;
  text-align: right;
  border: none;
  border-radius: 12px;
  background: transparent;
  color: white;
  outline: none;
}

/* Button Box Grid */
.button-box {
  display: grid;
  gap: 15px;
}

/* General Button Style */
button {
  padding: 18px;
  margin: auto 0px;
  border: none;
  border-radius: 50%;
  font-size: 1.2rem;
  font-weight: bold;
  color: #ffffff;
  background: #1c1c1c;
  box-shadow: 6px 6px 12px #0f0f0f, -6px -6px 12px #2d2d2d;
  cursor: pointer;
  transition: all 0.2s ease;
  height:60px;
  width:60px;
}

button:active {
  box-shadow: inset 4px 4px 8px #0f0f0f, inset -4px -4px 8px #2d2d2d;
}

/* Special Buttons */
.sp-button {
  color: #00ff73;
}

#equal {
  grid-column: span 2;
  background: #ff6600;
  color: white;
  box-shadow: -5px -5px 12px 0px #0f0f0f, 0px 0px 12px #ff8533;
}

#equal:active {
  box-shadow: inset 4px 4px 8px #b34700, inset -4px -4px 8px #ff944d;
}

/* Hover Effect */
button:hover {
  filter: brightness(1.2);
}

/* Responsive */
@media (max-width: 600px), (orientation: portrait) {
    body {
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh;
    }

    .container {
        width: 98vw;
        max-width: 98vw;
        min-height: 95vh;
        padding: 60px 4px; /* Reduced top/bottom padding */
        border-radius: 0;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        margin: auto;
    
    }

    .result-box input {
        font-size: 7rem;
        padding: 64px;
    }

    button {
        font-size: 5rem;
        border-radius: 50%;
        height: 200px;
        width: 200px;
        
    }

    .button-box {
        gap: 48px;
    }
    }