body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%); 
}

.calculator {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    padding: 24px;
    width: min(92vw, 380px);
    display: flex;
    flex-direction: column;
    align-items: center;
}

#display {
    width: 100%;
    height: 70px;
    background: rgba(255, 255, 255, 0.4);
    border: none;
    border-radius: 12px;
    font-size: 32px;
    font-weight: 300;
    text-align: right;
    margin-bottom: 20px;
    padding: 10px 20px;
    box-sizing: border-box;
    color: #333;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    width: 100%;
}

button {
    height: 60px;
    font-size: 20px;
    font-weight: 500;
    border: none;
    border-radius: 16px;
    cursor: pointer;
    background-color: rgba(255, 255, 255, 0.6);
    transition: all 0.2s ease;
    color: #444;
}

button:hover {
    background-color: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

.operator {
    background-color: #ff9f0a;
    color: white;
}

.equals {
    background-color: #34c759; 
    color: white;
}

.clear {
    background-color: #ff3b30;
    color: white;
}

/* Kermit Container */
.kermit-container {
    width: 100%;
    display: flex;
    justify-content: center;
    margin-top: 15px;
}

.kermit {
    height: 100px; 
    width: auto;
    border-radius: 10px;
    mix-blend-mode: multiply; 
}

/* Bigger, slightly zoomed-in look for desktop */
@media (min-width: 1024px) {
    .calculator {
        width: 400px;
        padding: 30px;
    }

    #display {
        height: 80px;
        font-size: 38px;
    }

    button {
        height: 68px;
        font-size: 22px;
    }

    .kermit {
        height: 115px;
    }
}

/* Mobile-friendly fit */
@media (max-width: 600px) {
    body {
        padding: 12px;
        align-items: flex-start;
    }

    .calculator {
        width: 100%;
        max-width: 360px;
        border-radius: 18px;
        padding: 16px;
    }

    .buttons {
        gap: 9px;
    }

    #display {
        height: 62px;
        font-size: 28px;
        margin-bottom: 14px;
        padding: 8px 14px;
    }

    button {
        height: 54px;
        font-size: 18px;
        border-radius: 12px;
    }

    .kermit {
        height: 88px;
    }
}