*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: #0f0f12;
    overflow: hidden;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.background {
    position: absolute;
    width: 100vw;
    height: 100vh;
    z-index: -1;
}

.background .shape {
    height: 200px;
    width: 200px;
    position: absolute;
    border-radius: 50%;
}

.shape:first-child {
    background: linear-gradient(#1845ad, #23a2f6);
    left: -80px;
    top: -80px;
    animation: float 6s ease-in-out infinite alternate;
}

.shape:last-child {
    background: linear-gradient(to right, #ff512f, #f09819);
    right: -30px;
    bottom: -80px;
    animation: float 8s ease-in-out infinite alternate-reverse;
}

@keyframes float {
    0% {
        transform: translate(0, 0);
    }

    100% {
        transform: translate(50px, 100px);
    }
}

.calculator {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    width: 350px;
    padding: 20px;
}

.display {
    min-height: 100px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: flex-end;
    word-break: break-all;
    word-wrap: break-word;
    color: white;
    margin-bottom: 20px;
    padding: 10px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
}

.previous-operand {
    color: rgba(255, 255, 255, 0.75);
    font-size: 1rem;
}

.current-operand {
    color: white;
    font-size: 2.5rem;
    font-weight: 600;
}

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

.btn {
    border: none;
    outline: none;
    background: rgba(255, 255, 255, 0.05);
    color: white;
    padding: 20px;
    font-size: 1.25rem;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.btn:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.btn:active {
    transform: translateY(0);
}

.operator {
    color: #4db5ff;
    font-weight: 600;
}

.equal {
    background: linear-gradient(to right, #1845ad, #23a2f6);
    color: white;
    font-weight: 600;
    border: none;
}

.equal:hover {
    background: linear-gradient(to right, #1845ad, #2691d9);
    box-shadow: 0 0 20px rgba(35, 162, 246, 0.5);
}

.span-2 {
    grid-column: span 2;
}

.footer {
    position: absolute;
    bottom: 20px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    letter-spacing: 1px;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}