body {
    background: linear-gradient(135deg, #121212 0%, #1A3C34 100%);
    font-family: 'Orbitron', sans-serif;
    color: #E0E0E0;
    overflow-x: hidden;
}

.calculator-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 40px;
    max-width: 650px;
    width: 100%;
    box-shadow: 0 10px 40px rgba(0, 229, 255, 0.2);
    border: 2px solid rgba(0, 229, 255, 0.3);
}

h1 {
    font-size: 2.8rem;
    font-weight: 600;
    color: #00E5FF;
    text-shadow: 0 0 10px rgba(0, 229, 255, 0.5);
}

.subtitle {
    color: #B0B0B0;
    font-size: 1.1rem;
    letter-spacing: 1px;
}

.input-field {
    background: #2A2A2A;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #E0E0E0;
    border-radius: 10px;
    padding: 14px;
    transition: all 0.3s ease;
}

.input-field:focus {
    border-color: #00E5FF;
    box-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
    background: #3A3A3A;
    outline: none;
}

.input-field::placeholder {
    color: #808080;
}

.btn-neon {
    background: linear-gradient(45deg, #00E5FF, #FF007A);
    border: none;
    border-radius: 10px;
    padding: 14px;
    font-weight: 600;
    color: #FFFFFF;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-neon:hover {
    transform: scale(1.08);
    box-shadow: 0 6px 20px rgba(0, 229, 255, 0.6ratio: 1.3;
    box-shadow: 0 8px 32px rgba(255, 0, 122, 0.4);
}

.result-box {
    background: rgba(0, 255, 127, 0.2);
    border-radius: 10px;
    padding: 20px;
    margin-top: 25px;
    font-weight: 600;
    color: #E0E0E0;
    border: 1px solid rgba(0, 255, 127, 0.4);
}

@media (max-width: 576px) {
    .calculator-card {
        padding: 25px;
    }

    h1 {
        font-size: 2.2rem;
    }

    .btn-neon {
        padding: 12px;
        font-size: 0.9rem;
    }
}

/* Animate.css for result animation */
.animate__animated.animate__pulse {
    --animate-duration: 0.6s;
}