.calc-container {
    padding: 60px 5%;
    min-height: calc(100vh - 80px); /* Account for navbar */
}

.calc-header {
    text-align: center;
    margin-bottom: 60px;
}

.calc-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 40px;
    align-items: stretch;
}

.calc-panel {
    background: var(--bg-surface-light);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
}

.calc-panel h2 {
    font-size: 1.5rem;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-family: var(--font-mono);
}

select {
    width: 100%;
    padding: 15px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: 8px;
    font-family: var(--font-sans);
    font-size: 1.1rem;
    outline: none;
    cursor: pointer;
    transition: border-color 0.3s ease;
    appearance: none; /* remove default arrow */
    background-image: url('data:image/svg+xml;utf8,<svg fill="%23ffffff" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/></svg>');
    background-repeat: no-repeat;
    background-position-x: 95%;
    background-position-y: 50%;
}

select:focus {
    border-color: var(--brand-cyan);
}

.disclaimer {
    margin-top: 40px;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Results Panel */
.results-panel {
    display: flex;
    flex-direction: column;
}

.result-highlight {
    background: rgba(0, 240, 255, 0.05);
    border: 1px solid var(--brand-cyan);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    margin-bottom: 40px;
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.1);
}

.result-label {
    font-family: var(--font-mono);
    color: var(--brand-cyan);
    font-size: 1rem;
    letter-spacing: 2px;
    display: block;
    margin-bottom: 10px;
}

.result-value {
    font-size: 3.5rem;
    font-weight: 700;
    color: #fff;
    line-height: 1;
}

.capacity-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 20px;
}

.capacity-card {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s ease;
}

.capacity-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255,255,255,0.3);
}

.cap-title {
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.cap-value {
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 5px;
}

.cap-sub {
    font-size: 0.75rem;
    color: #666;
}

/* Responsive */
@media (max-width: 900px) {
    .calc-grid {
        grid-template-columns: 1fr;
    }
    .capacity-cards {
        grid-template-columns: 1fr;
    }
}