/* BODY AND CALCULATOR CONTAINER */
body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #1d3557, #457b9d);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

#calculator {
    background: #f1faee;
    padding: 20px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 360px;
    max-width: 90vw;
}

/* DISPLAY */
#display {
    background: #222;
    color: #fff;
    text-align: right;
    padding: 15px;
    border-radius: 12px;
    min-height: 80px;
    overflow: hidden;
}

#history {
    font-size: 0.9rem;
    color: #aaa;
    display: block;
    margin-bottom: 5px;
}

#currentdisplay {
    font-size: 2rem;
    font-weight: bold;
    word-break: break-all;
}

/* BUTTON CONTAINER */
#container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* ROWS */
.row {
    display: flex;
    justify-content: space-between;
    gap: 10px;
}

/* BUTTONS */
button {
    width: 70px;
    height: 70px;
    font-size: 1.3rem;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: 0.2s;
    box-shadow: 0 5px 10px rgba(0,0,0,0.2);
}

/* NUMBER BUTTONS */
.numberbtn {
    background: #a8dadc;
}
.numberbtn:hover {
    background: #7dc2c3;
}

/* OPERATION BUTTONS */
.operationbtn {
    background: #f4a261;
    color: #fff;
}
.operationbtn:hover {
    background: #e76f51;
}

/* SPECIAL BUTTONS */
#result {
    background: #2a9d8f;
    color: #fff;
}
#result:hover {
    background: #21867a;
}

#clear {
    background: #e63946;
    color: #fff;
}
#clear:hover {
    background: #b8232f;
}

#del {
    background: #457b9d;
    color: #fff;
}
#del:hover {
    background: #365879;
}