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

    font-family: 'Poppins', sans-serif;
}

body {
    min-height: 100vh;

    display: flex;
    justify-content: center;
    align-items: center;

    background:
        linear-gradient(135deg,
            #141414,
            #1f1f1f,
            #111827);

    overflow: hidden;
}

/* BACKGROUND GLOW */

.background-glow {
    position: absolute;

    width: 500px;
    height: 500px;

    background: #7c3aed;

    filter: blur(120px);

    opacity: 0.25;

    border-radius: 50%;
}

/* CALCULATOR CONTAINER */

.calculator-container {
    position: relative;

    z-index: 2;
}

/* CALCULATOR */

.calculator {
    width: 360px;

    padding: 22px;

    border-radius: 30px;

    background:
        rgba(255, 255, 255, 0.06);

    backdrop-filter: blur(18px);

    border:
        1px solid rgba(255, 255, 255, 0.08);

    box-shadow:
        0 10px 40px rgba(0, 0, 0, 0.4);

    animation: fadeIn 1s ease;
}

/* DISPLAY */

.display {
    width: 100%;
    height: 75px;

    border: none;
    outline: none;

    border-radius: 20px;

    margin-bottom: 25px;

    background:
        rgba(255, 255, 255, 0.05);

    color: white;

    text-align: right;

    padding: 20px;

    font-size: 2.3rem;
    font-weight: 500;

    box-shadow:
        inset 0 4px 10px rgba(0, 0, 0, 0.3);
    pointer-events: none;
}

/* BUTTON GRID */

.buttons {
    transition: 0.2s ease;

    cursor: pointer;
    display: grid;

    grid-template-columns:
        repeat(4, 1fr);

    gap: 15px;
}

/* BUTTONS */

button {
    height: 62px;

    border: none;
    outline: none;

    border-radius: 18px;

    background:
        rgba(255, 255, 255, 0.06);

    color: white;

    font-size: 1.2rem;
    font-weight: 500;

    cursor: pointer;

    transition: 0.3s;

    box-shadow:
        0 4px 10px rgba(0, 0, 0, 0.25);

    -webkit-tap-highlight-color: transparent;
    user-select: none;
    touch-action: manipulation;
}

/* BUTTON CLICK EFFECT */

button:active {

    transform: scale(0.92);
}

/* HOVER EFFECT */

button:hover {
    transform: translateY(-3px);

    background:
        rgba(255, 255, 255, 0.12);
}

/* CLICK EFFECT */

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

/* OPERATOR BUTTONS */

.operator {
    background:
        rgba(124, 58, 237, 0.25);

    color: #c4b5fd;
}

/* EQUAL BUTTON */

.equal {
    grid-column: span 2;

    background:
        linear-gradient(135deg,
            #7c3aed,
            #9333ea);

    color: white;

    font-size: 1.4rem;
}

/* ANIMATION */

@keyframes fadeIn {

    from {
        opacity: 0;
        transform: translateY(40px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* RESPONSIVE */

@media(max-width:480px) {

    .calculator {
        width: 95%;
        padding: 20px;
    }

    button {
        height: 65px;
    }

    .display {
        font-size: 2rem;
    }
}

/* HISTORY PANEL */

.history-panel {
    margin-top: 25px;

    padding: 20px;

    border-radius: 20px;

    background:
        rgba(255, 255, 255, 0.04);

    border:
        1px solid rgba(255, 255, 255, 0.06);

    max-height: 180px;

    overflow-y: auto;
}

.history-panel h3 {
    color: white;

    margin-bottom: 15px;

    font-size: 1rem;

    font-weight: 500;
}

.history-list {
    list-style: none;
}

.history-list li {
    color: #d1d5db;

    margin-bottom: 10px;

    font-size: 0.95rem;

    word-break: break-word;
}

/* FLOATING SHAPES */

.floating-shape {
    position: absolute;

    border-radius: 50%;

    filter: blur(90px);

    opacity: 0.18;

    animation:
        floatAnimation 10s infinite ease-in-out;
}

/* SHAPE 1 */

.shape1 {
    width: 250px;
    height: 250px;

    background: #9333ea;

    top: 10%;
    left: 10%;
}

/* SHAPE 2 */

.shape2 {
    width: 300px;
    height: 300px;

    background: #06b6d4;

    bottom: 5%;
    right: 10%;

    animation-delay: 3s;
}

/* FLOAT ANIMATION */

@keyframes floatAnimation {

    0% {
        transform:
            translateY(0px) translateX(0px);
    }

    50% {
        transform:
            translateY(-30px) translateX(20px);
    }

    100% {
        transform:
            translateY(0px) translateX(0px);
    }
}

/* TIME INFO */

.time-info {
    display: flex;

    justify-content: space-between;

    align-items: center;

    margin-bottom: 20px;

    padding: 0 5px;
}

.live-time,
.live-date {
    color: rgba(255, 255, 255, 0.75);

    font-size: 0.85rem;

    letter-spacing: 1px;
}