@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700&display=swap');

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

body {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-end;
    background-color: #2c0505; /* Dark Maroon, less harsh */
}

.calculater {
    background-color: #4a0a0a; /* Soft deep red */
    width: 100%;
    padding: 20px;
    border-radius: 30px 30px 0 0;
    border-top: 1px solid #8c620a; /* Muted gold border */
}

input {
    width: 100%;
    border: none;
    padding: 30px 20px;
    background: transparent;
    font-size: 50px;
    color: #d4af37; /* Metallic gold, not too bright */
    text-align: right;
    outline: none;
    margin-bottom: 20px;
}

.buttons-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

button {
    height: 70px;
    border-radius: 20px;
    border: none;
    background-color: #7a0d0d; /* Matte dark red */
    color: #e0c070; /* Soft gold text */
    font-size: 24px;
    cursor: pointer;
    transition: 0.3s;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

/* '=' button soft highlight */
button:last-child {
    background-color: #b8860b; /* Goldenrod */
    color: #2c0505;
}

button:hover {
    background-color: #9c1212;
}

button:active {
    transform: scale(0.95);
    background-color: #d4af37;
    color: #000;
}