:root {
    --bg-dark: #0b0f19;
    --card-bg: #151c2c;
    --border-color: #232d42;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-blue: #38bdf8;
    --accent-green: #22c55e;
    --accent-red: #ef4444;
    --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-main);
    margin: 0;
    padding: 1.5rem;
    display: flex;
    justify-content: center;
}

.app-container {
    width: 100%;
    max-width: 1100px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.dashboard-header {
    background: var(--card-bg);
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    font-size: 2rem;
    color: var(--accent-blue);
}

h1 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
}

.subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 850px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
}

.panel-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.panel-card h2 {
    margin-top: 0.5rem;
    margin-bottom: 0.25rem;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-blue);
}

.form-row {
    display: flex;
    gap: 1rem;
}

.form-row .form-group {
    flex: 1;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.form-group label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.form-group input, .form-group select {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.65rem;
    border-radius: 0.5rem;
    outline: none;
    font-size: 0.95rem;
}

.form-group input:focus, .form-group select:focus {
    border-color: var(--accent-blue);
}

.result-highlight {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    padding: 1.25rem;
    border-radius: 0.5rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    transition: all 0.3s ease;
}

.refund-positive {
    border-color: var(--accent-green);
    background: rgba(34, 197, 94, 0.05);
}

.refund-positive .highlight-value {
    color: var(--accent-green);
}

.refund-negative {
    border-color: var(--accent-red);
    background: rgba(239, 68, 68, 0.05);
}

.refund-negative .highlight-value {
    color: var(--accent-red);
}

.highlight-label {
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

.highlight-value {
    font-size: 2.2rem;
    font-weight: 800;
}

.status-subtext {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.breakdown-list {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    margin-top: 0.5rem;
}

.divider {
    height: 1px;
    background: var(--border-color);
    margin: 0.25rem 0;
}

.breakdown-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.breakdown-row span:last-child {
    color: var(--text-primary);
    font-weight: 600;
}

.total-row {
    font-size: 0.95rem;
    font-weight: bold;
    color: var(--text-primary);
}