/*
 * Perspectiva Digital — Knowledge surfaces
 * Shared visual language for books, documents, articles, posts and forums.
 * site-v2.css owns the global shell; this file owns knowledge presentation.
 */

:root {
    --vd-content-width: 1180px;
    --vd-reading-width: 760px;
    --vd-knowledge-bg: #101f37;
    --vd-knowledge-panel: #172b4d;
    --vd-knowledge-panel-raised: #1d365d;
    --vd-knowledge-rule: rgba(207, 173, 75, .38);
    --vd-knowledge-rule-soft: rgba(238, 244, 251, .14);
    --vd-knowledge-text: #eef4fb;
    --vd-knowledge-muted: #c7d4e5;
    --vd-knowledge-accent: #efd58d;
    --vd-knowledge-radius: 8px;
    --vd-reading-leading: 1.78;
}

/* Existing public knowledge pages */
.vd-knowledge-surface {
    background: var(--vd-knowledge-bg);
}

.vd-knowledge-surface .vd-page-hero {
    min-height: 430px;
}

.vd-knowledge-section {
    isolation: isolate;
}

.vd-knowledge-section .vd-section-head {
    max-width: 820px;
}

.vd-knowledge-section .vd-grid-2,
.vd-knowledge-section .vd-grid-3 {
    align-items: stretch;
}

.vd-knowledge-card {
    min-height: 220px;
    display: flex;
    flex-direction: column;
    border-color: var(--vd-knowledge-rule);
    background: var(--vd-knowledge-panel);
}

.vd-knowledge-card h3 {
    max-width: 34ch;
}

.vd-knowledge-card p {
    max-width: 64ch;
    line-height: 1.72;
}

.vd-knowledge-card .vd-text-link {
    margin-top: auto;
    padding-top: 1rem;
}

.vd-page--library .vd-knowledge-card {
    border-left: 4px solid var(--vd-antique-gold);
}

.vd-page--articles .vd-knowledge-card {
    border-top: 3px solid var(--vd-glow);
}

.vd-page--community .vd-knowledge-card {
    border-left: 4px solid var(--vd-surface);
}

.vd-page--forum .vd-knowledge-card {
    min-height: 190px;
    border-left: 4px solid var(--vd-glow);
}

/* Shared shell, filters and state */
.vd-content-shell {
    width: min(var(--vd-content-width), calc(100% - 3rem));
    margin-inline: auto;
}

.vd-content-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: end;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem;
    border: 1px solid var(--vd-knowledge-rule);
    border-radius: var(--vd-knowledge-radius);
    background: var(--vd-knowledge-panel);
}

.vd-content-toolbar label {
    display: grid;
    gap: .4rem;
    color: var(--vd-knowledge-muted);
    font-size: .78rem;
    font-weight: 700;
}

.vd-content-toolbar :where(input, select) {
    min-width: min(17rem, 100%);
    min-height: 44px;
    padding: .65rem .75rem;
    border: 1px solid #7185a5;
    border-radius: 5px;
    color: var(--vd-knowledge-text);
    background: #07142a;
    font: inherit;
}

.vd-filter-list,
.vd-meta-list,
.vd-taxonomy {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.vd-filter,
.vd-meta-chip,
.vd-taxonomy a {
    display: inline-flex;
    align-items: center;
    min-height: 32px;
    padding: .35rem .62rem;
    border: 1px solid var(--vd-knowledge-rule);
    border-radius: 999px;
    color: var(--vd-knowledge-muted);
    background: rgba(7, 20, 42, .48);
    font-size: .72rem;
    line-height: 1.2;
}

.vd-filter[aria-current="true"],
.vd-filter:hover,
.vd-taxonomy a:hover {
    color: #101d33;
    background: var(--vd-gold-light);
    border-color: var(--vd-gold-light);
}

.vd-empty-state {
    max-width: 760px;
    margin: 2rem auto;
    padding: clamp(1.5rem, 4vw, 2.5rem);
    border: 1px dashed var(--vd-knowledge-rule);
    border-radius: var(--vd-knowledge-radius);
    text-align: center;
    background: rgba(23, 43, 77, .62);
}

/* Library: books and documents */
.vd-resource-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
}

.vd-resource-card {
    min-width: 0;
    min-height: 100%;
    display: grid;
    grid-template-rows: auto 1fr auto;
    overflow: hidden;
    border: 1px solid var(--vd-knowledge-rule);
    border-radius: var(--vd-knowledge-radius);
    color: var(--vd-knowledge-text);
    background: var(--vd-knowledge-panel);
}

.vd-resource-cover {
    min-height: 180px;
    display: grid;
    place-items: center;
    padding: 1.25rem;
    border-bottom: 1px solid var(--vd-knowledge-rule);
    color: var(--vd-knowledge-accent);
    background: #13294b;
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(1.2rem, 2vw, 1.65rem);
    text-align: center;
}

.vd-resource-card[data-kind="book"] .vd-resource-cover {
    box-shadow: inset 7px 0 var(--vd-antique-gold);
}

.vd-resource-card[data-kind="document"] .vd-resource-cover {
    background: #1b365d;
}

.vd-resource-card[data-kind="article"] .vd-resource-cover {
    box-shadow: inset 0 4px var(--vd-glow);
}

.vd-resource-body {
    min-width: 0;
    padding: 1.25rem;
}

.vd-resource-body h2,
.vd-resource-body h3 {
    margin: .45rem 0 .7rem;
    overflow-wrap: anywhere;
    font-size: clamp(1.18rem, 2vw, 1.48rem);
}

.vd-resource-body p {
    color: var(--vd-knowledge-muted);
    line-height: 1.68;
}

.vd-resource-actions {
    display: flex;
    flex-wrap: wrap;
    gap: .65rem;
    padding: 0 1.25rem 1.25rem;
}

/* Articles and posts */
.vd-post-list {
    display: grid;
    gap: 1rem;
}

.vd-post-card {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1rem 2rem;
    padding: 1.35rem;
    border: 1px solid var(--vd-knowledge-rule-soft);
    border-left: 4px solid var(--vd-glow);
    border-radius: var(--vd-knowledge-radius);
    background: var(--vd-knowledge-panel);
}

.vd-post-card h2,
.vd-post-card h3 {
    margin: .25rem 0 .55rem;
    font-size: clamp(1.3rem, 2.5vw, 1.8rem);
}

.vd-post-excerpt {
    max-width: 72ch;
    color: var(--vd-knowledge-muted);
    line-height: 1.7;
}

.vd-post-meta,
.vd-thread-meta {
    color: var(--vd-knowledge-muted);
    font-size: .76rem;
    line-height: 1.55;
}

/* Forum and discussion */
.vd-thread-list {
    display: grid;
    gap: .75rem;
}

.vd-thread {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: .8rem 1.5rem;
    align-items: center;
    padding: 1.1rem 1.25rem;
    border: 1px solid var(--vd-knowledge-rule-soft);
    border-left: 4px solid var(--vd-surface);
    border-radius: var(--vd-knowledge-radius);
    background: var(--vd-knowledge-panel);
}

.vd-thread[data-state="pinned"] {
    border-left-color: var(--vd-gold-light);
}

.vd-thread[data-state="locked"] {
    opacity: .78;
}

.vd-thread h2,
.vd-thread h3 {
    margin: 0 0 .35rem;
    font-size: clamp(1.05rem, 2vw, 1.32rem);
}

.vd-thread-stats {
    min-width: 7rem;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .5rem;
    text-align: center;
}

.vd-thread-stats span {
    padding: .45rem;
    border-left: 1px solid var(--vd-knowledge-rule-soft);
    color: var(--vd-knowledge-muted);
    font-size: .72rem;
}

/* Long-form reader */
.vd-reader-layout {
    width: min(var(--vd-content-width), calc(100% - 3rem));
    margin-inline: auto;
    display: grid;
    grid-template-columns: minmax(0, var(--vd-reading-width)) minmax(220px, 300px);
    justify-content: center;
    gap: clamp(2rem, 5vw, 4.5rem);
}

.vd-reader {
    min-width: 0;
    padding: clamp(1.35rem, 4vw, 3rem);
    border: 1px solid var(--vd-knowledge-rule);
    border-radius: var(--vd-knowledge-radius);
    color: #172033;
    background: #f4f0e6;
    box-shadow: 0 18px 45px rgba(3, 10, 24, .24);
}

.vd-reader-header {
    margin-bottom: 2rem;
    padding-bottom: 1.4rem;
    border-bottom: 1px solid rgba(23, 32, 51, .22);
}

.vd-reader-header h1 {
    margin: .55rem 0 .8rem;
    font-size: clamp(2rem, 4.5vw, 3.4rem);
    line-height: 1.12;
}

.vd-prose {
    max-width: 72ch;
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(1.03rem, 1.4vw, 1.15rem);
    line-height: var(--vd-reading-leading);
}

.vd-prose :where(p, ul, ol, blockquote, table, pre) {
    margin-block: 1.15em;
}

.vd-prose :where(h2, h3, h4) {
    margin-top: 1.65em;
    margin-bottom: .55em;
    line-height: 1.25;
}

.vd-prose a {
    color: #12479a;
    text-decoration: underline;
    text-decoration-thickness: .08em;
    text-underline-offset: .16em;
}

.vd-prose blockquote {
    margin-inline: 0;
    padding: .8rem 1.2rem;
    border-left: 4px solid #9b7534;
    background: rgba(200, 166, 83, .12);
}

.vd-prose :where(img, video, iframe, table) {
    max-width: 100%;
}

.vd-prose table {
    width: 100%;
    border-collapse: collapse;
    font-family: Inter, "Segoe UI", Arial, sans-serif;
    font-size: .9rem;
}

.vd-prose :where(th, td) {
    padding: .65rem;
    border: 1px solid rgba(23, 32, 51, .22);
    text-align: start;
    vertical-align: top;
}

.vd-reader-aside {
    align-self: start;
    position: sticky;
    top: 96px;
    padding: 1rem;
    border: 1px solid var(--vd-knowledge-rule);
    border-radius: var(--vd-knowledge-radius);
    background: var(--vd-knowledge-panel);
}

[dir="rtl"] .vd-resource-card[data-kind="book"] .vd-resource-cover {
    box-shadow: inset -7px 0 var(--vd-antique-gold);
}

[dir="rtl"] :where(.vd-post-card, .vd-thread, .vd-page--library .vd-knowledge-card, .vd-page--community .vd-knowledge-card, .vd-page--forum .vd-knowledge-card) {
    border-left-width: 1px;
    border-right-width: 4px;
}

@media (max-width: 920px) {
    .vd-resource-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .vd-reader-layout {
        grid-template-columns: 1fr;
    }

    .vd-reader-aside {
        position: static;
    }
}

@media (max-width: 620px) {
    .vd-content-shell,
    .vd-reader-layout {
        width: min(100% - 2rem, var(--vd-content-width));
    }

    .vd-resource-grid,
    .vd-post-card,
    .vd-thread {
        grid-template-columns: 1fr;
    }

    .vd-thread-stats {
        width: 100%;
        max-width: 12rem;
    }

    .vd-thread-stats span {
        border-top: 1px solid var(--vd-knowledge-rule-soft);
        border-left: 0;
    }

    .vd-reader {
        padding: 1.15rem;
    }
}

@media print {
    .vd-header,
    .vd-footer,
    .vd-content-toolbar,
    .vd-reader-aside,
    .vd-resource-actions {
        display: none !important;
    }

    .vd-reader-layout,
    .vd-reader,
    .vd-prose {
        width: 100%;
        max-width: none;
        margin: 0;
        padding: 0;
        border: 0;
        color: #000;
        background: #fff;
        box-shadow: none;
    }
}