@font-face {
    font-family: "calculator-font";
    src: url(digital-7.ttf);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "calculator-font";
}

body {
    padding: 20px;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0e0e0e, #1a1a1a);
}

/* Calculator Container */

.container {
    padding: 30px;
    border-radius: 15px;
    background-color: #151515;
    border: 2px solid #C75C2A;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

/* Display */

.display {
    width: 100%;
    margin-bottom: 30px;
    border-radius: 10px;
    background-color: #0f0f0f;
    border: 2px solid #C75C2A;
    height: 120px;
    font-size: 40px;
    padding: 20px;
    color: #00ff9d;
    text-align: right;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    letter-spacing: 2px;
    box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.7);
}

/* Buttons Grid */

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

/* Buttons */

.btns button {
    height: 70px;
    border: none;
    border-radius: 8px;
    background: #262626;
    color: white;
    font-size: 26px;
    cursor: pointer;
    transition: all .2s ease;
    box-shadow: 0 4px 0 #111;
}

/* Hover */

.btns button:hover {
    background: #C75C2A;
    transform: translateY(-2px);
}

/* Click */

.btns button:active {
    transform: translateY(3px);
    box-shadow: 0 1px 0 #111;
}

/* Operators */

.operator {
    background: #C75C2A;
}

/* Equal button */

.equal {
    background: #00b894;
    color: black;
    font-weight: bold;
    grid-column: span 2;
}

/* Clear button */

.clear {
    background: #d63031;
}