:root {
    --pca-primary: #214e8a;
    --pca-accent: #ff6b35;
    --pca-surface: #ffffff;
    --pca-border: #d9e2ef;
    --pca-muted: #6b7280;
    --pca-bg: #f5f7fb;
}

.iframe-content {
    background: var(--pca-bg);
}

.card {
    background: var(--pca-surface);
    border: 1px solid var(--pca-border);
    border-radius: 14px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px rgba(18, 38, 63, 0.04);
}

.demo-area {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(320px, 1fr);
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.panel-header h3 {
    margin: 0;
}

.panel-header p {
    margin: 0.3rem 0 0;
    color: var(--pca-muted);
    font-size: 0.95rem;
}

.summary-badges {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
}

.summary-badges span {
    display: block;
    font-size: 0.75rem;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--pca-muted);
}

.summary-badges strong {
    font-size: 1.1rem;
}

.plot-wrapper {
    position: relative;
    height: 420px;
    border: 1px solid var(--pca-border);
    border-radius: 12px;
    background: #fff;
    padding: 0.5rem;
}

.plot-wrapper canvas {
    width: 100% !important;
    height: 100% !important;
}

.projection-plots {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 1rem;
}

.projection-plot-container {
    border: 1px solid var(--pca-border);
    border-radius: 10px;
    background: #fdfefe;
    padding: 0.75rem;
}

.projection-plot-container h4 {
    margin: 0 0 0.5rem;
    font-size: 0.9rem;
    color: var(--pca-muted);
}

.projection-plot-container canvas {
    width: 100% !important;
    height: 80px !important;
    display: block;
}

.variance-cov-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1rem;
    margin-top: 1.25rem;
}

.variance-card,
.covariance-card {
    border: 1px solid var(--pca-border);
    border-radius: 10px;
    padding: 1rem;
    background: #fdfefe;
}

.variance-card h4,
.covariance-card h4,
.control-panel h3 {
    margin: 0 0 0.75rem;
}

.variance-values {
    display: flex;
    gap: 1.5rem;
}

.variance-values span {
    color: var(--pca-muted);
    font-size: 0.85rem;
}

.variance-values strong {
    font-size: 1.2rem;
}

.variance-summary {
    margin-top: 0.8rem;
    color: var(--pca-muted);
    font-size: 0.9rem;
}

.covariance-card table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.covariance-card th,
.covariance-card td {
    border: 1px solid var(--pca-border);
    padding: 0.4rem 0.6rem;
    text-align: center;
}

.covariance-card thead th:first-child {
    background: transparent;
    border: none;
}

.control-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.control-group label {
    font-weight: 600;
}

input[type="range"] {
    width: 100%;
}

.control-value {
    font-size: 0.9rem;
    color: var(--pca-muted);
}

.inline-inputs > input {
    width: 120px;
    padding: 0.4rem 0.5rem;
    border: 1px solid var(--pca-border);
    border-radius: 8px;
    font-size: 0.95rem;
}

.inline-inputs {
    display: flex;
    gap: 0.5rem;
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.button-group button {
    border-radius: 10px;
    border: 1px solid var(--pca-border);
    background: #fff;
    padding: 0.5rem 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease;
}

.button-group button:not(.secondary) {
    background: var(--pca-primary);
    color: #fff;
    border-color: var(--pca-primary);
}

.button-group button.secondary:hover,
.button-group button.secondary:focus {
    background: rgba(33, 78, 138, 0.08);
}

.control-hint {
    margin: 0.5rem 0 0;
    font-size: 0.9rem;
    color: var(--pca-muted);
}

@media (max-width: 1080px) {
    .demo-area {
        grid-template-columns: 1fr;
    }

    .plot-wrapper {
        height: 360px;
    }

    .projection-plots {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .summary-badges {
        flex-direction: column;
        align-items: flex-start;
    }

    .inline-inputs {
        flex-direction: column;
    }

    .inline-inputs > input {
        width: 100%;
    }
}