* {
    box-sizing: border-box;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    margin: 0px;
    padding: 0px;
}

body {
    background-color: rgb(224, 229, 236);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

#container {
    background-color: rgb(224, 229, 236);
    box-shadow: rgb(190, 195, 201) 20px 20px 60px, rgb(255, 255, 255) -20px -20px 60px;
    width: 350px;
    padding: 25px;
    border-radius: 30px;
}

.display {
    background-color: #e0e5ec;
    height: 70px;
    width: 100%;
    margin-bottom: 25px;
    border-radius: 12px;
    padding: 0 15px; /* Side padding for the text */
    
    /* Neumorphic Sunken Effect */
    box-shadow: inset 5px 5px 10px #bec3c9, 
                inset -5px -5px 10px #ffffff;
    
    /* Scroll Logic: Essential for handling long numbers */
    display: block;        /* Changed from flex to block to allow scrolling */
    overflow-x: auto;      /* Enable horizontal scroll */
    overflow-y: hidden;    /* Hide vertical scroll */
    scroll-behavior: smooth;
    white-space: nowrap;   /* Force text to stay on one line */
}

#display {
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.8rem;
    color: #3d444d;
    
    display: block;        /* Fill the container width */
    text-align: right;     /* Keep numbers on the right side */
    min-width: 100%;       /* Force it to at least match container width */
    line-height: 80px;     /* Vertically centers the text (match container height) */
}

.display::-webkit-scrollbar {
    height: 5px;
}

.display::-webkit-scrollbar-track {
    background: transparent;
    margin: 0 10px;
}

.display::-webkit-scrollbar-thumb {
    background: transparent; /* Invisible by default */
    border-radius: 10px;
    transition: background 0.3s ease;
}


/* Show the scrollbar thumb only when hovering over the display box */
.display:hover::-webkit-scrollbar-thumb {
    background: #bec3c9; 
    box-shadow: inset 1px 1px 2px #ffffff;
}

/* Button Rows */
.button-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
}

#buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

button {
    border-radius: 50%;
    border-width: initial;
    border-style: none;
    border-color: initial;
    border-image: initial;
    outline: none;
    transition: 0.2s;
    background-color: rgb(224, 229, 236);
    font-size: 1.2rem;
    height: 60px;
    width: 60px;
    font-weight: 600;
    color: rgb(85, 85, 85);
    cursor: pointer;
    box-shadow: rgb(190, 195, 201) 6px 6px 12px,
        rgb(255, 255, 255) -6px -6px 12px;
    margin: 5px;
}

/* Button Press Effect */
button:active {
    box-shadow: inset 4px 4px 8px #bec3c9, 
                inset -4px -4px 8px #ffffff;
    transform: scale(0.98);
}

button:last-child {
    color: rgb(255, 140, 0);
}

button:hover {
    color: rgb(0, 0, 0);
}

#decimal, #del {
    width: 48%;
    border-radius: 15px;
}

#del {
    color: rgb(217, 83, 79);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    box-shadow: none;
    background: #d1d9e6;
}

/* Branding Styles */
.brand-header h1 {
    font-size: 1.5rem;
    color: #7a828e;
    text-align: center;
    margin-bottom: 15px;
    letter-spacing: 4px;
    text-transform: uppercase;
    /* This makes it look engraved */
    text-shadow: 1px 1px 1px #ffffff, -1px -1px 1px #bec3c9;
}