/* === SECTION NAV BAR === */
.section-nav {
    display: flex;
    align-items: center;
    margin-bottom: 0.8rem;
    position: relative;
}
.section-nav-arrow {
    flex-shrink: 0;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--fg-muted);
    padding: 0.25rem 0.4rem;
    line-height: 1;
    transition: color 0.2s;
    user-select: none;
}
.section-nav-arrow:hover {
    color: var(--fg);
}
.section-nav-arrow.hidden {
    visibility: hidden;
}
.section-nav-track {
    flex: 1;
    overflow: hidden;
    position: relative;
    mask-image: linear-gradient(to right, transparent, black 1rem, black calc(100% - 1rem), transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 1rem, black calc(100% - 1rem), transparent);
}
.section-nav-list {
    display: flex;
    overflow-x: auto;
    scroll-behavior: smooth;
    -ms-overflow-style: none;
    scrollbar-width: none;
    padding: 0.1rem 0;
}
.section-nav-list::-webkit-scrollbar {
    display: none;
}
.section-nav-item {
    flex-shrink: 0;
    font-family: -apple-system, system-ui, "Helvetica Neue", sans-serif;
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--fg-muted);
    text-decoration: none;
    padding: 0.3rem 0.7rem;
    white-space: nowrap;
    transition: color 0.2s;
    border-right: 1px solid var(--border-faint);
}
.section-nav-item:last-child {
    border-right: none;
}
.section-nav-item:hover {
    color: var(--fg);
}
.section-nav-item.active {
    color: var(--accent);
}
.section-nav-rule {
    border-top: 1px solid var(--border);
    margin-bottom: 0.3rem;
}

/* === FILTERED MODE === */
.filtered-grid {
    list-style: none;
    column-gap: 1.5rem;
}
.digest-item-card {
    break-inside: avoid;
    padding-bottom: 1.2rem;
    margin-bottom: 0.3rem;
    border-bottom: 1px solid var(--border-faint);
}
.digest-item-card .item-summary {
    display: block;
    text-indent: 0;
}

/* === HEADLINE === */
.digest-headline {
    font-family: "PT Serif", Georgia, serif;
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    text-align: center;
    margin-bottom: 1.5rem;
    line-height: 1.35;
    color: var(--fg-secondary);
    text-shadow: var(--emboss-subtle);
}

.digest-headline-rule {
    border-top: 3px solid var(--border-heavy);
    margin-bottom: 1.5rem;
}

/* === PIN BUTTON === */
.pin-section-btn {
    flex-shrink: 0;
    margin-right: 0.4rem;
    padding: 0;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 0.55rem;
    color: var(--section-heading-fg);
    opacity: 0.3;
    transition: opacity 0.2s;
}
.digest-section:hover .pin-section-btn {
    opacity: 0.6;
}
.pin-section-btn:hover {
    opacity: 1;
}
.digest-section.pinned .pin-section-btn {
    opacity: 0.6;
}
.pin-nav-dot {
    display: inline-block;
    width: 4px;
    height: 4px;
    background: var(--accent);
    border-radius: 1px;
    vertical-align: middle;
    margin-right: 0.15rem;
}

/* === PINNED SECTIONS === */
.pinned-sections {
    margin-bottom: 0.5rem;
}
.pinned-sections .summary ul {
    column-gap: 1.5rem;
}
.pinned-divider {
    border-top: 2px dashed var(--border);
    margin-bottom: 1.5rem;
}

/* === DIGEST GRID === */
.digest-grid {
    column-gap: 1.5rem;
}

.pinned-sections .digest-section,
.digest-grid .digest-section {
    padding: 0 0 1.5rem;
}
.digest-grid .digest-section {
    break-inside: avoid;
}

/* === SECTION STYLES === */
.digest-section h3 {
    font-family: "PT Serif", Georgia, serif;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--section-heading-fg);
    background: var(--accent);
    padding: 0.2rem 0.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    overflow: hidden;
}
.digest-section h3 span {
    flex: 1;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    mask-image: linear-gradient(to right, black 80%, transparent);
    -webkit-mask-image: linear-gradient(to right, black 80%, transparent);
}

.digest-grid .digest-section .summary {
    padding-top: 0.7rem;
}

.digest-section .summary {
    font-family: "PT Serif", Georgia, serif;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--fg-dim);
}

/* Items list */
.digest-section .summary ul,
.digest-section .summary ol {
    list-style: none;
}

.digest-section .summary li {
    break-inside: avoid;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-faint);
    margin-bottom: 0.4rem;
}

.digest-section .summary li:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.digest-section .summary p {
    margin-bottom: 0.5rem;
}

/* Topic name */
.item-topic {
    display: block;
    font-family: "PT Serif", Georgia, serif;
    font-size: 1rem;
    font-weight: 700;
    color: var(--fg);
    line-height: 1.35;
    margin-bottom: 0.15rem;
    text-decoration: none;
}
a.item-topic:hover {
    color: var(--accent);
}

/* Top bar: sources + importance overlaid on image */
.item-top-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 22px;
    padding: 0 0.5rem;
    background: rgba(var(--bg-rgb), 0.75);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}
.item-top-bar .sources-wrap,
.item-top-bar .sources-btn,
.item-top-bar .importance-bar {
    display: flex;
    align-items: center;
    line-height: 1;
}
.item-top-bar .importance-bar {
    display: block;
    flex-shrink: 0;
    align-self: center;
}
.item-top-bar--no-image {
    position: static;
    margin-bottom: 0.3rem;
    background: rgba(var(--fg-rgb), 0.04);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}

/* Bottom actions: similar (left) + research (right) */
.item-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 0.3rem;
}

/* Item image */
.item-image-wrap {
    position: relative;
    margin-bottom: 0.4rem;
}
.item-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    display: block;
    image-rendering: pixelated;
}

/* Summary text */
.item-summary {
    color: var(--fg-muted);
    font-size: 0.88rem;
    text-indent: 0.8em;
}

.digest-section .summary code {
    background: var(--code-bg);
    padding: 0.1rem 0.3rem;
    border-radius: 3px;
    font-size: 0.9em;
}

/* Importance bar */
.importance-bar {
    display: inline-block;
    width: 28px;
    height: 4px;
    border-radius: 2px;
    vertical-align: middle;
    margin-right: 0.4rem;
    position: relative;
    cursor: default;
}
.importance-bar::after {
    content: attr(data-label);
    position: absolute;
    bottom: calc(100% + 4px);
    left: 50%;
    transform: translateX(-50%);
    font-family: -apple-system, system-ui, "Helvetica Neue", sans-serif;
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    white-space: nowrap;
    color: #fff;
    background: rgba(0,0,0,0.75);
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s;
}
.importance-bar:hover::after {
    opacity: 1;
}
.importance-bar.critical {
    background: #d32f2f;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.3);
}
.importance-bar.high {
    background: #e65100;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.25);
}
.importance-bar.medium {
    background: #e67e22;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.2);
}
.importance-bar.low {
    background: #999;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.empty {
    text-align: center;
    padding: 3rem;
    color: var(--fg-muted);
}

/* Back to top */
.back-to-top {
    display: none;
    position: fixed;
    bottom: 1.2rem;
    right: 1.2rem;
    z-index: 150;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--section-heading-fg);
    border: none;
    font-size: 1rem;
    line-height: 1;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.25);
    align-items: center;
    justify-content: center;
}
.back-to-top.visible {
    display: flex;
}

/* === RESPONSIVE === */

/* Tablet portrait: 2 columns */
@media (min-width: 600px) and (max-width: 899px) {
    .digest-grid,
    .filtered-grid,
    .pinned-sections .summary ul {
        columns: 2;
    }
}

/* Tablet landscape: 3 columns */
@media (min-width: 900px) and (max-width: 1199px) {
    .digest-grid,
    .filtered-grid,
    .pinned-sections .summary ul {
        columns: 3;
    }
}

/* Desktop: 5 columns */
@media (min-width: 1200px) {
    .digest-grid,
    .filtered-grid,
    .pinned-sections .summary ul {
        columns: 5;
    }
}

/* Mobile: single column */
@media (max-width: 599px) {
    .section-nav-item {
        font-size: 0.6rem;
        padding: 0.25rem 0.5rem;
    }

    .digest-headline-rule {
        margin-bottom: 1rem;
    }

    .digest-section .summary {
        font-size: 0.8rem;
    }

    .item-topic {
        font-size: 0.9rem;
    }

}