:root {
    --csh-accent: #b79b62;
    --csh-border: rgba(127,127,127,.28);
    --csh-muted: rgba(127,127,127,.85);
    --csh-surface: rgba(127,127,127,.06);
    --csh-radius: 16px;
}

.csh-series,
.csh-series-grid,
.csh-article-nav {
    box-sizing: border-box;
}

.csh-series {
    margin: 2.5rem 0;
    padding: clamp(1.25rem, 3vw, 2.25rem);
    border: 1px solid var(--csh-border);
    border-radius: var(--csh-radius);
    background: var(--csh-surface);
}

.csh-series + .csh-series { margin-top: 3rem; }
.csh-series-header { max-width: 850px; margin-bottom: 1.5rem; }
.csh-eyebrow,
.csh-feature-label,
.csh-section-heading > span {
    color: var(--csh-accent);
    font-size: .76rem;
    font-weight: 700;
    letter-spacing: .13em;
    text-transform: uppercase;
}

.csh-series-title { margin: .35rem 0 .75rem; font-size: clamp(1.8rem, 4vw, 3rem); line-height: 1.08; }
.csh-series-description { margin: 0; font-size: 1.08rem; line-height: 1.7; opacity: .86; }
.csh-series-image { margin: 1.5rem 0; overflow: hidden; border-radius: calc(var(--csh-radius) - 4px); }
.csh-series-image img { display: block; width: 100%; height: auto; }

.csh-feature {
    margin: 1.5rem 0;
    padding: 1.25rem 1.35rem;
    border-left: 3px solid var(--csh-accent);
    background: rgba(127,127,127,.07);
}
.csh-feature h3 { margin: .35rem 0 .5rem; font-size: 1.35rem; }
.csh-feature p { margin: .5rem 0 .7rem; }
.csh-feature a, .csh-part a, .csh-related a, .csh-card-title a, .csh-article-nav a { text-decoration: none; }
.csh-text-link { font-weight: 600; }

.csh-video-section,
.csh-parts,
.csh-related { margin-top: 2rem; }
.csh-section-heading { margin-bottom: .9rem; }
.csh-section-heading h3 { margin: .2rem 0 0; font-size: 1.35rem; }

.csh-video { position: relative; width: 100%; padding-top: 56.25%; overflow: hidden; border-radius: calc(var(--csh-radius) - 4px); background: #000; }
.csh-video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

.csh-parts-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--csh-border); }
.csh-part { display: grid; grid-template-columns: 3rem 1fr; gap: 1rem; padding: 1.1rem 0; border-bottom: 1px solid var(--csh-border); }
.csh-part-number { color: var(--csh-accent); font-weight: 700; font-variant-numeric: tabular-nums; padding-top: .1rem; }
.csh-part h4 { margin: 0 0 .35rem; font-size: 1.08rem; }
.csh-part p { margin: 0 0 .55rem; opacity: .8; }
.csh-part-actions { display: flex; flex-wrap: wrap; gap: 1rem; font-size: .92rem; font-weight: 600; }

.csh-related ul { margin: 0; padding-left: 1.2rem; }
.csh-related li { margin: .45rem 0; }

.csh-series-grid { display: grid; grid-template-columns: repeat(var(--csh-columns, 2), minmax(0, 1fr)); gap: 1.25rem; margin: 2rem 0; }
.csh-series-card { overflow: hidden; border: 1px solid var(--csh-border); border-radius: var(--csh-radius); background: var(--csh-surface); }
.csh-card-image { display: block; aspect-ratio: 16 / 9; overflow: hidden; }
.csh-card-image img { width: 100%; height: 100%; object-fit: cover; }
.csh-card-body { padding: 1.15rem 1.2rem 1.3rem; }
.csh-card-title { margin: .3rem 0 .65rem; font-size: 1.3rem; }
.csh-card-body p { margin: 0 0 .8rem; opacity: .82; }
.csh-card-meta { font-size: .84rem; opacity: .68; }

.csh-article-nav { margin: 2rem 0; padding: 1rem 1.1rem; border: 1px solid var(--csh-border); border-radius: 12px; }
.csh-article-nav-series { margin-bottom: .7rem; }
.csh-article-nav-series span { opacity: .65; }
.csh-article-nav-links { display: flex; justify-content: space-between; gap: 1rem; font-size: .92rem; }
.csh-next { text-align: right; margin-left: auto; }

.csh-notice { padding: .75rem 1rem; border: 1px solid #d8a43b; background: rgba(216,164,59,.08); }

@media (max-width: 760px) {
    .csh-series-grid { grid-template-columns: 1fr; }
    .csh-part { grid-template-columns: 2.25rem 1fr; gap: .65rem; }
    .csh-article-nav-links { flex-direction: column; }
    .csh-next { text-align: left; margin-left: 0; }
}

/* Centralized series sources */
.csh-sources {
    margin-top: 2.25rem;
    padding-top: 1.75rem;
    border-top: 1px solid var(--csh-border);
}
.csh-sources-intro { margin: 0 0 1.25rem; opacity: .78; }
.csh-source-group {
    scroll-margin-top: 7rem;
    margin: 1.1rem 0;
    padding: 1.15rem 1.2rem;
    border: 1px solid var(--csh-border);
    border-radius: 12px;
    background: rgba(127,127,127,.035);
}
.csh-source-group:target {
    outline: 2px solid var(--csh-accent);
    outline-offset: 3px;
}
.csh-source-kicker {
    color: var(--csh-accent);
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
}
.csh-source-group h4 { margin: .25rem 0 .8rem; }
.csh-source-list { margin: 0; padding-left: 1.35rem; }
.csh-source-list li { margin: .55rem 0; line-height: 1.6; overflow-wrap: anywhere; }
.csh-source-back { margin: .85rem 0 0; font-size: .9rem; }
.csh-source-back a { text-decoration: none; font-weight: 600; }

.csh-article-sources-link {
    margin: 2rem 0;
    padding: 1rem 1.1rem;
    border-left: 3px solid var(--csh-accent);
    background: var(--csh-surface);
}
.csh-article-sources-link span {
    display: block;
    margin-bottom: .25rem;
    color: var(--csh-accent);
    font-size: .76rem;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
}
.csh-article-sources-link a { text-decoration: none; font-weight: 600; }

/* Structured research source metadata (v0.3) */
.csh-source-author { font-weight: 600; }
.csh-source-year { white-space: nowrap; }
.csh-source-title { font-style: italic; }
.csh-source-type {
    display: inline-block;
    margin-left: .35rem;
    padding: .12rem .42rem;
    border: 1px solid var(--csh-border);
    border-radius: 999px;
    font-size: .72em;
    font-style: normal;
    line-height: 1.4;
    vertical-align: .08em;
    opacity: .82;
}
.csh-source-url { margin-left: .35rem; white-space: nowrap; text-decoration: none; font-weight: 600; }
.csh-source-legacy { opacity: .9; }

/* Optional v0.4 structured identifiers. */
.csh-source-doi, .csh-source-isbn { display: inline; overflow-wrap: anywhere; font-size: .92em; }

/* v0.4.1: reading-first navigation and optional, per-article disclosures. */
.csh-series *, .csh-series-grid *, .csh-sources * { box-sizing: border-box; }
.csh-series-introduction { margin: 0 0 1.5rem; }
.csh-part-content, .csh-card-body { min-width: 0; }
.csh-series-title, .csh-part h4, .csh-card-title, .csh-card-parts a, .csh-card-pillar a {
    overflow-wrap: anywhere;
}
.csh-series .csh-part h4 a, .csh-series .csh-pillar h3 a,
.csh-card-parts a, .csh-card-pillar a, .csh-source-group h4 a {
    text-decoration: underline;
    text-decoration-color: var(--csh-border);
    text-underline-offset: .18em;
}
.csh-series a:hover, .csh-card-parts a:hover, .csh-card-pillar a:hover, .csh-source-group h4 a:hover {
    text-decoration: underline;
}
.csh-series a:focus-visible, .csh-series-grid a:focus-visible,
.csh-source-group a:focus-visible, .csh-source-summary:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 4px;
    border-radius: 3px;
}
.csh-reading-actions { display: flex; flex-wrap: wrap; align-items: baseline; gap: .65rem 1.25rem; margin-top: .65rem; }
.csh-reading-actions > .csh-part-actions { align-items: baseline; padding: .35rem 0; }
.csh-read-article { font-weight: 700; }
.csh-source-disclosure { min-width: 0; max-width: 100%; scroll-margin-top: 7rem; }
.csh-reading-actions > .csh-source-disclosure[open] { flex-basis: 100%; }
.csh-source-summary {
    display: list-item;
    width: fit-content;
    max-width: 100%;
    padding: .4rem .7rem;
    border: 1px solid var(--csh-border);
    border-radius: 7px;
    background: transparent;
    color: inherit;
    cursor: pointer;
    font-size: .9rem;
    font-weight: 600;
    line-height: 1.6;
}
.csh-source-summary:hover { background: var(--csh-surface); }
.csh-source-count { font-size: .88em; opacity: .8; font-variant-numeric: tabular-nums; }
.csh-source-disclosure > .csh-source-summary .csh-sources-when-open { display: none; }
.csh-source-disclosure[open] > .csh-source-summary .csh-sources-when-open { display: inline; }
.csh-source-disclosure[open] > .csh-source-summary .csh-sources-when-closed { display: none; }
.csh-source-disclosure:not([open]) > .csh-source-body { display: none; }
.csh-source-body {
    margin-top: .65rem;
    padding: 1rem 1.15rem;
    border: 1px solid var(--csh-border);
    border-radius: 10px;
    background: var(--csh-surface);
    overflow-wrap: anywhere;
    font-size: .94rem;
}
.csh-part .csh-source-body p, .csh-feature .csh-source-body p { opacity: 1; }
.csh-source-body .csh-source-body-heading { margin: 0 0 .65rem; font-weight: 700; }
.csh-source-disclosure:target { outline: 2px solid var(--csh-accent); outline-offset: 5px; border-radius: 7px; }
.csh-source-jump { display: inline-block; margin-top: .4rem; font-size: .9rem; font-weight: 600; }
.csh-empty-parts { padding: .8rem 0; opacity: .75; }
.csh-related-list > li { padding: .5rem 0; }
.csh-related-title { display: inline-block; font-weight: 600; margin-bottom: .5rem; }
.csh-card-meta { margin-bottom: .9rem; }
.csh-card-pillar { padding: .8rem 0; border-top: 1px solid var(--csh-border); }
.csh-card-pillar > span, .csh-card-part-number {
    display: block;
    margin-bottom: .25rem;
    font-size: .75rem;
    font-weight: 700;
    color: inherit;
    opacity: .75;
}
.csh-card-pillar a, .csh-card-parts a { line-height: 1.45; font-weight: 600; }
.csh-card-body .csh-card-parts { list-style: none; margin: .9rem 0 1rem; padding: 0; border-top: 1px solid var(--csh-border); }
.csh-card-parts > li { margin: 0; padding: .8rem 0; border-bottom: 1px solid var(--csh-border); }
.csh-card-explore { display: inline-block; margin-top: .4rem; font-size: .9rem; font-weight: 700; text-decoration: none; }
.csh-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}
@media (max-width: 480px) {
    .csh-reading-actions { gap: .5rem .9rem; }
    .csh-source-body { padding: .8rem; }
    .csh-series .csh-part { grid-template-columns: 1.75rem minmax(0, 1fr); }
}