:root {
    --primary-gradient: linear-gradient(135deg, #00c6ff 0%, #0072ff 100%);
    --accent-color: #ffcc00;
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --text-color: #ffffff;
}

.bba-calc-container {
    background: var(--primary-gradient);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    max-width: 600px;
    margin: 2rem auto;
    font-family: 'Inter', sans-serif;
    color: var(--text-color);
}

.bba-calc-title {
    margin-bottom: 2rem;
    text-align: center;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.bba-calc-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.bba-calc-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.bba-calc-input-group label {
    font-size: 0.9rem;
    font-weight: 500;
    opacity: 0.9;
}

.bba-calc-input-group input, 
.bba-calc-input-group select {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 0.8rem;
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    backdrop-filter: blur(10px);
}

.bba-calc-input-group select option {
    background: #0072ff;
    color: white;
}

.bba-calc-btn {
    background: var(--accent-color);
    color: #1a1a1a;
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
    margin-top: 0.5rem;
}

.bba-calc-btn:hover {
    background: #e6b800;
    transform: translateY(-2px);
}

.bba-calc-results {
    margin-top: 2.5rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.bba-result-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    backdrop-filter: blur(5px);
}

.bba-result-card.highlight {
    grid-column: span 2;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid var(--accent-color);
}

.bba-label {
    display: block;
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

.bba-value {
    font-size: 1.5rem;
    font-weight: 800;
}