/* Set background image and base styles */
body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', sans-serif;
    height: 100vh;
    background: url('background.jpg') no-repeat center center/cover;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

/* Stickers */
.stickers img {
    width: 80px;
    height: 80px;
    position: absolute;
    z-index: 3;
}

.sticker.left {
    top: 30px;
    left: 30px;
}

.sticker.right {
    bottom: 30px; /* moved to bottom */
    right: 30px;
    top: auto;     /* remove top alignment */
}

/* Background animation layer */
.background-animation {
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.05);
    z-index: 1;
    backdrop-filter: blur(3px);
}

/* Main container with glass effect */
.container {
    position: relative;
    z-index: 5;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.18);
    padding: 30px;
    width: 320px;
    text-align: center;
    color: #fff;
}

/* Calculator screen */
.calculator input {
    width: 100%;
    padding: 15px;
    font-size: 1.5rem;
    border: none;
    border-radius: 10px;
    margin-bottom: 20px;
    background: rgba(255, 255, 255, 0.25);
    color: #000; /* black text */
    text-align: right;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.2);
}

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

button {
    padding: 15px;
    font-size: 1.4rem;
    border: none;
    border-radius: 10px;
    background: #001f3f; /* navy blue */
    color: #fff;
    cursor: pointer;
    transition: 0.2s ease-in-out;
}

button:hover {
    background: #003366;
    transform: scale(1.05);
}