/* Layered Reading Panel
   Uses semantic CSS variables for automatic dark/light mode support. */

.layered-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.layered-title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.layered-title-symbol {
    color: var(--accent-500);
    font-weight: 600;
}

.btn-layered {
    padding: var(--space-2) var(--space-4);
    background: var(--accent-500);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s, box-shadow 0.2s;
}

.btn-layered:hover:not(:disabled) {
    opacity: 0.85;
}

.btn-layered:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Layer toggles */
.layered-toggles {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
    margin-bottom: var(--space-4);
}

.layered-toggle {
    padding: 4px 10px;
    font-size: var(--text-xs);
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-default);
    border-radius: 999px;
    cursor: pointer;
    transition: all 0.15s;
}

.layered-toggle.is-active {
    background: var(--accent-500);
    color: white;
    border-color: var(--accent-500);
}

/* Meta row: genre + reference */
.layered-meta {
    display: flex;
    gap: var(--space-2);
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-4);
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.genre-badge {
    display: inline-block;
    padding: 2px 10px;
    background: var(--accent-50);
    color: var(--accent-600);
    border-radius: 999px;
    font-weight: 500;
    font-size: var(--text-xs);
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.cached-badge {
    font-size: 0.6875rem;
    color: #0ea5e9;
    opacity: 0.8;
}

/* Layer cards */
.layered-cards {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.layer-card {
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: 8px;
    overflow: hidden;
    transition: border-color 0.2s;
}

.layer-card.is-not-applicable {
    opacity: 0.65;
}

.layer-card-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    text-align: left;
}

.layer-card-header:hover {
    background: var(--accent-50);
}

.layer-card-title {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.layer-icon {
    font-size: var(--text-lg);
    width: 1.5rem;
    display: inline-block;
    text-align: center;
}

.layer-chevron {
    transition: transform 0.2s;
    color: var(--text-tertiary);
}

.layer-card.is-open .layer-chevron {
    transform: rotate(180deg);
}

.layer-card-body {
    padding: 0 var(--space-4) var(--space-4);
    color: var(--text-primary);
    font-size: 0.9375rem;
    line-height: 1.65;
    display: none;
}

.layer-card.is-open .layer-card-body { display: block; }

.layer-card-body.is-muted {
    font-style: italic;
    color: var(--text-tertiary);
}

/* Deep principle - visually distinct */
.layer-card.is-deep-principle .layer-card-body {
    font-size: 1.0625rem;
    font-weight: 500;
    font-style: normal;
    color: var(--accent-600);
}

/* Cautions footer */
.layered-cautions {
    margin-top: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: rgba(245, 158, 11, 0.08);
    border-left: 3px solid #f59e0b;
    border-radius: 4px;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.layered-cautions-label {
    display: block;
    font-weight: 500;
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
    color: #b45309;
}

/* Skeleton loading */
.layered-skeleton {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.skeleton-card {
    height: 64px;
    background: linear-gradient(90deg,
        rgba(148, 163, 184, 0.08) 25%,
        rgba(148, 163, 184, 0.16) 50%,
        rgba(148, 163, 184, 0.08) 75%);
    background-size: 200% 100%;
    border-radius: 8px;
    animation: skeleton-shimmer 1.4s infinite linear;
}

@keyframes skeleton-shimmer {
    from { background-position: 200% 0; }
    to   { background-position: -200% 0; }
}

/* Error state */
.layered-error {
    padding: var(--space-4);
    background: rgba(220, 38, 38, 0.08);
    border: 1px solid rgba(220, 38, 38, 0.2);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: var(--text-sm);
}

.layered-retry {
    margin-top: var(--space-2);
    padding: 4px 12px;
    background: transparent;
    border: 1px solid currentColor;
    border-radius: 4px;
    color: inherit;
    font-size: var(--text-xs);
    cursor: pointer;
}

/* Mobile */
@media (max-width: 640px) {
    .layered-header {
        flex-direction: column;
        align-items: stretch;
    }
    .btn-layered {
        width: 100%;
    }
}