:root {
    --ddw-ssp-primary: #0073aa;
    --ddw-ssp-accent: #28a745;
    --ddw-ssp-warning: #dc3545;
    --ddw-ssp-neutral: #6c757d;
}

.ddw-ssp-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    font-family: sans-serif;
    background: #f8f9fa;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.ddw-ssp-row {
    display: flex;
    flex-direction: column;
    margin-bottom: 15px;
}

.ddw-ssp-row label {
    margin-bottom: 5px;
    color: var(--ddw-ssp-neutral, #6c757d); /* Fallback for picky parsers */
}

.ddw-ssp-row input, .ddw-ssp-row select {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.ddw-ssp-row input:focus, .ddw-ssp-row select:focus {
    border-color: var(--ddw-ssp-primary);
    outline: none;
}

#calc-btn, #pdf-btn, #advanced-toggle {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin: 5px;
    transition: transform 0.2s;
}

#calc-btn:hover, #pdf-btn:hover, #advanced-toggle:hover {
    transform: scale(1.05);
}

#advanced-toggle {
    background: var(--ddw-ssp-neutral, #6c757d);
    color: white;
}

.ddw-ssp-toggle button {
    background: var(--ddw-ssp-primary);
    color: white;
    border: none;
    padding: 8px 16px;
    margin: 5px;
    border-radius: 4px;
    cursor: pointer;
}

.ddw-ssp-toggle button.active {
    background: var(--ddw-ssp-accent);
}

.ddw-ssp-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.ddw-ssp-table th, .ddw-ssp-table td {
    padding: 8px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.ddw-ssp-table th {
    background: var(--ddw-ssp-primary);
    color: white;
}

#summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin: 20px 0;
    padding: 15px;
    background: white;
    border-radius: 4px;
}

#summary div {
    text-align: center;
}

#summary .gains {
    color: var(--ddw-ssp-accent);
    font-weight: bold;
}

.error {
    color: var(--ddw-ssp-warning);
    font-size: 0.9em;
}

/* Responsive */
@media (max-width: 768px) {
    .ddw-ssp-container {
        padding: 10px;
    }
    #summary {
        grid-template-columns: 1fr;
    }
    .ddw-ssp-table {
        font-size: 14px;
    }
    .ddw-ssp-table th, .ddw-ssp-table td {
        padding: 4px;
    }
    .ddw-ssp-row {
        flex-direction: column;
    }
    #ddw-ssp-chart {
        max-height: 300px;
    }
}

/* Dark mode support if WP adds it */
@media (prefers-color-scheme: dark) {
    :root {
        --ddw-ssp-primary: #4da6ff;
        --ddw-ssp-accent: #4caf50;
    }
    .ddw-ssp-container {
        background: #333;
        color: white;
    }
}