/* ============================================ */
/* Research page — section-scoped styles        */
/* ============================================ */
/* Global tokens (--v-*), .bg-warm utilities,   */
/* .v-announcement, and mobile menu animations  */
/* live in src/input.css and are global.        */
/*                                              */
/* Visual idiom: library catalog, not SaaS.     */
/* No card frames, no gray section bands,       */
/* separation via whitespace + 1px hairlines.   */
/* ============================================ */

/* ============================================ */
/* Hero                                         */
/* ============================================ */

.rs-hero {
    background: #ffffff;
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.rs-hero-inner {
    max-width: 1240px;
    margin: 0 auto;
    padding: 120px 40px 64px;
    text-align: center;
}

.rs-hero-eyebrow {
    font-family: var(--v-mono);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--v-ink-3);
    margin: 0 0 32px;
    display: inline-flex;
    align-items: center;
    gap: 14px;
}

.rs-hero-eyebrow::before {
    content: '';
    width: 22px;
    height: 1px;
    background: var(--v-amber);
}

.rs-hero-headline {
    font-family: var(--v-display);
    font-size: clamp(56px, 9vw, 128px);
    line-height: 0.92;
    letter-spacing: -0.035em;
    font-weight: 900;
    color: var(--v-ink);
    margin: 0 auto 32px;
    max-width: 14ch;
}

.rs-hero-headline .rs-period {
    color: var(--v-amber);
}

.rs-hero-subline {
    font-family: var(--v-sans);
    font-size: clamp(17px, 1.5vw, 20px);
    line-height: 1.55;
    color: var(--v-ink-2);
    max-width: 64ch;
    margin: 0 auto 24px;
    font-weight: 400;
}

.rs-hero-glossary {
    margin: 0 auto 56px;
    font-family: var(--v-mono);
    font-size: 12px;
    letter-spacing: 0.06em;
    color: var(--v-ink-3);
}

.rs-hero-glossary-link {
    color: var(--v-amber);
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 163, 23, 0.4);
    padding-bottom: 1px;
    margin-left: 6px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: color 140ms ease, border-color 140ms ease;
}

.rs-hero-glossary-link:hover {
    color: var(--v-ink);
    border-bottom-color: var(--v-ink);
}

.rs-hero-glossary-link svg { transition: transform 140ms ease; }
.rs-hero-glossary-link:hover svg { transform: translateX(2px); }

/* Stats strip — four columns, mono labels, Saira numbers */
.rs-hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    padding-top: 40px;
    border-top: 1px solid var(--v-line);
}

.rs-stat-num {
    font-family: var(--v-display);
    font-weight: 800;
    font-size: clamp(40px, 5vw, 64px);
    line-height: 1;
    color: var(--v-ink);
    letter-spacing: -0.02em;
}

.rs-stat-label {
    margin-top: 10px;
    font-family: var(--v-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--v-ink-3);
}

@media (max-width: 720px) {
    .rs-hero-inner { padding: 88px 22px 48px; }
    .rs-hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}

/* ============================================ */
/* Filter strip (anchor index, tier toggles)    */
/* ============================================ */

.rs-filter {
    background: #ffffff;
    position: sticky;
    top: 0;
    z-index: 30;
    border-top: 1px solid var(--v-line);
    border-bottom: 1px solid var(--v-line);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.92);
}

.rs-filter-inner {
    max-width: 1240px;
    margin: 0 auto;
    padding: 14px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.rs-filter-label {
    font-family: var(--v-mono);
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--v-ink-3);
}

.rs-tier-toggles {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px;
    border: 1px solid var(--v-line);
    border-radius: 999px;
}

.rs-tier-toggle {
    appearance: none;
    border: 0;
    background: transparent;
    font-family: var(--v-mono);
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--v-ink-2);
    padding: 7px 14px;
    border-radius: 999px;
    cursor: pointer;
    transition: background 160ms ease, color 160ms ease;
}

.rs-tier-toggle:hover { color: var(--v-ink); }

.rs-tier-toggle.is-active {
    background: var(--v-ink);
    color: #ffffff;
}

.rs-domain-jump {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    font-family: var(--v-mono);
    font-size: 10.5px;
    letter-spacing: 0.14em;
}

.rs-domain-jump a {
    color: var(--v-ink-3);
    text-decoration: none;
    padding: 4px 6px;
    transition: color 140ms ease;
}

.rs-domain-jump a:hover { color: var(--v-ink); }

@media (max-width: 980px) {
    .rs-domain-jump { display: none; }
}
@media (max-width: 640px) {
    .rs-filter-inner { padding: 12px 18px; }
    .rs-tier-toggle { padding: 6px 10px; font-size: 10px; }
}

/* ============================================ */
/* Domain section — chapter layout              */
/* ============================================ */

.rs-domain {
    background: #ffffff;
    padding: 96px 40px 64px;
    scroll-margin-top: 64px;
}

.rs-domain + .rs-domain { padding-top: 80px; }

.rs-domain-inner {
    max-width: 1240px;
    margin: 0 auto;
}

/* Chapter header: big number + title on the same baseline.
   Number is dramatically large and amber-tinted; sits in mono. */
.rs-domain-head {
    display: grid;
    grid-template-columns: minmax(110px, 14%) 1fr auto;
    gap: 40px;
    align-items: end;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--v-ink);
    margin-bottom: 56px;
}

.rs-domain-num {
    font-family: var(--v-mono);
    font-size: clamp(48px, 7vw, 88px);
    font-weight: 700;
    line-height: 0.9;
    color: var(--v-amber);
    letter-spacing: -0.02em;
}

.rs-domain-titleblock { padding-bottom: 8px; }

.rs-domain-title {
    font-family: var(--v-display);
    font-size: clamp(32px, 4.2vw, 56px);
    line-height: 1;
    letter-spacing: -0.025em;
    font-weight: 800;
    color: var(--v-ink);
    margin: 0 0 14px;
}

.rs-domain-blurb {
    font-family: var(--v-sans);
    font-size: 16px;
    line-height: 1.55;
    color: var(--v-ink-2);
    max-width: 56ch;
    margin: 0;
    font-weight: 400;
}

.rs-domain-count {
    align-self: end;
    padding-bottom: 12px;
    text-align: right;
    font-family: var(--v-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--v-ink-3);
}

.rs-domain-count strong {
    display: block;
    font-family: var(--v-display);
    font-weight: 800;
    font-size: 34px;
    line-height: 1;
    color: var(--v-ink);
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}

@media (max-width: 820px) {
    .rs-domain { padding: 72px 22px 48px; }
    .rs-domain-head {
        grid-template-columns: 1fr;
        gap: 18px;
        align-items: start;
    }
    .rs-domain-num { font-size: 56px; }
    .rs-domain-count {
        align-self: start;
        text-align: left;
        padding-bottom: 0;
        order: -1;
    }
    .rs-domain-count strong { display: inline; margin-right: 8px; }
}

/* ============================================ */
/* Subsection labels inside a domain            */
/* ============================================ */

.rs-sub-label {
    font-family: var(--v-mono);
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--v-ink-3);
    margin: 0 0 28px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.rs-sub-label::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--v-amber);
    border-radius: 50%;
}

.rs-sub-block + .rs-sub-block { margin-top: 64px; }

/* ============================================ */
/* Tier 1 — featured entries (large typographic) */
/* ============================================ */

.rs-featured {
    display: grid;
    grid-template-columns: 1fr;
}

.rs-note-featured {
    display: grid;
    grid-template-columns: minmax(170px, 18%) 1fr;
    gap: 40px;
    padding: 32px 0;
    border-top: 1px solid var(--v-line);
    transition: background 160ms ease;
}

.rs-note-featured:first-child { border-top: 0; padding-top: 8px; }
.rs-note-featured:last-child { padding-bottom: 8px; }
.rs-note-featured:hover { background: rgba(255, 163, 23, 0.04); }

.rs-note-meta {
    font-family: var(--v-mono);
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--v-ink-3);
    line-height: 1.6;
    padding-top: 8px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
}

.rs-note-meta-line {
    font-family: var(--v-mono);
    font-size: 10.5px;
    letter-spacing: 0.16em;
    color: var(--v-ink-3);
}

.rs-tier-badge {
    display: inline-block;
    padding: 3px 8px 4px;
    background: var(--v-ink);
    color: #ffffff;
    font-family: var(--v-mono);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.16em;
    margin-bottom: 6px;
}

.rs-tier-badge--two {
    background: var(--v-amber-soft);
    color: var(--v-amber-deep);
}

.rs-tier-badge--three {
    background: transparent;
    color: var(--v-ink-3);
    border: 1px solid var(--v-line);
    padding: 2px 7px 3px;
}

.rs-note-body { min-width: 0; }

.rs-note-title {
    font-family: var(--v-display);
    font-size: clamp(22px, 2.4vw, 32px);
    line-height: 1.1;
    letter-spacing: -0.015em;
    font-weight: 700;
    color: var(--v-ink);
    margin: 0 0 12px;
}

.rs-note-blurb {
    font-family: var(--v-sans);
    font-size: 16px;
    line-height: 1.55;
    color: var(--v-ink-2);
    margin: 0 0 18px;
    max-width: 70ch;
    font-weight: 400;
}

.rs-phase-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 4px;
}

.rs-phase-chip {
    font-family: var(--v-mono);
    font-size: 10.5px;
    font-weight: 500;
    letter-spacing: 0.06em;
    color: var(--v-ink-2);
    padding: 3px 9px 4px;
    border: 1px solid var(--v-line);
    border-radius: 999px;
    background: #ffffff;
    white-space: nowrap;
}

@media (max-width: 820px) {
    .rs-note-featured {
        grid-template-columns: 1fr;
        gap: 14px;
        padding: 28px 0;
    }
    .rs-note-meta { padding-top: 0; }
    .rs-note-title { font-size: 22px; }
}

/* ============================================ */
/* Tier 2 — reference entries (2-col compact)   */
/* ============================================ */

.rs-reference {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
    border-top: 1px solid var(--v-line);
}

.rs-note-ref {
    padding: 24px 32px 24px 0;
    border-bottom: 1px solid var(--v-line);
    transition: background 160ms ease;
}

.rs-note-ref:nth-child(2n) {
    padding-right: 0;
    padding-left: 32px;
    border-left: 1px solid var(--v-line);
}

.rs-note-ref:hover { background: rgba(255, 163, 23, 0.04); }

.rs-ref-meta {
    font-family: var(--v-mono);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--v-amber-deep);
    margin-bottom: 8px;
}

.rs-ref-title {
    font-family: var(--v-display);
    font-size: 20px;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.01em;
    color: var(--v-ink);
    margin: 0 0 8px;
}

.rs-ref-blurb {
    font-family: var(--v-sans);
    font-size: 14.5px;
    line-height: 1.55;
    color: var(--v-ink-2);
    margin: 0 0 12px;
    max-width: 60ch;
    font-weight: 400;
}

.rs-ref-phases {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.rs-ref-phase {
    font-family: var(--v-mono);
    font-size: 10px;
    letter-spacing: 0.06em;
    color: var(--v-ink-3);
    padding: 2px 7px 3px;
    border: 1px solid var(--v-line-soft);
    border-radius: 999px;
}

@media (max-width: 820px) {
    .rs-reference { grid-template-columns: 1fr; }
    .rs-note-ref { padding: 22px 0; }
    .rs-note-ref:nth-child(2n) {
        padding-left: 0;
        border-left: 0;
    }
}

/* ============================================ */
/* Tier 3 — background entries (compact list)   */
/* ============================================ */

.rs-background {
    border-top: 1px solid var(--v-line);
}

.rs-bg-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.rs-bg-item {
    display: grid;
    grid-template-columns: minmax(220px, 28%) 1fr auto;
    gap: 24px;
    align-items: baseline;
    padding: 18px 0;
    border-bottom: 1px solid var(--v-line-soft);
    transition: background 160ms ease;
}

.rs-bg-item:hover { background: rgba(255, 163, 23, 0.04); }

.rs-bg-title {
    font-family: var(--v-display);
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -0.005em;
    color: var(--v-ink);
    line-height: 1.25;
}

.rs-bg-blurb {
    font-family: var(--v-sans);
    font-size: 14.5px;
    line-height: 1.55;
    color: var(--v-ink-2);
    margin: 0;
    font-weight: 400;
}

.rs-bg-phases {
    font-family: var(--v-mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--v-ink-3);
    white-space: nowrap;
}

@media (max-width: 820px) {
    .rs-bg-item {
        grid-template-columns: 1fr;
        gap: 6px;
        padding: 16px 0;
    }
    .rs-bg-phases { font-size: 9.5px; }
}

/* ============================================ */
/* Methodology footer                           */
/* ============================================ */

.rs-method {
    background: var(--v-bg-dark);
    color: #ffffff;
    padding: 96px 40px;
}

.rs-method-inner {
    max-width: 1240px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(200px, 26%) 1fr;
    gap: 56px;
    align-items: start;
}

.rs-method-eyebrow {
    font-family: var(--v-mono);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--v-amber);
    margin-bottom: 18px;
}

.rs-method-headline {
    font-family: var(--v-display);
    font-size: clamp(28px, 3vw, 42px);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.02em;
    color: #ffffff;
    margin: 0;
}

.rs-method-body {
    font-family: var(--v-sans);
    font-size: 16px;
    line-height: 1.65;
    color: rgba(255, 255, 255, 0.72);
    margin: 0;
    max-width: 62ch;
}

.rs-method-body p + p { margin-top: 18px; }

.rs-method-list {
    margin-top: 32px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 22px 40px;
    list-style: none;
    padding: 0;
}

.rs-method-list li {
    display: grid;
    grid-template-columns: 18px 1fr;
    gap: 12px;
    align-items: start;
    font-family: var(--v-sans);
    font-size: 14.5px;
    color: rgba(255, 255, 255, 0.82);
    line-height: 1.5;
}

.rs-method-list li::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--v-amber);
    margin-top: 7px;
    border-radius: 50%;
}

.rs-method-list strong {
    color: #ffffff;
    font-weight: 600;
}

.rs-method-glossary {
    margin-top: 28px;
    font-family: var(--v-mono);
    font-size: 12px;
    letter-spacing: 0.06em;
    color: rgba(255, 255, 255, 0.56);
}

.rs-method-glossary a {
    color: var(--v-amber);
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 163, 23, 0.4);
    padding-bottom: 1px;
    margin-left: 6px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: color 140ms ease, border-color 140ms ease;
}

.rs-method-glossary a:hover {
    color: #ffffff;
    border-bottom-color: rgba(255, 255, 255, 0.6);
}

.rs-method-glossary a svg { transition: transform 140ms ease; }
.rs-method-glossary a:hover svg { transform: translateX(2px); }

@media (max-width: 820px) {
    .rs-method { padding: 72px 22px; }
    .rs-method-inner {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .rs-method-list { grid-template-columns: 1fr; }
}

/* ============================================ */
/* CTA strip                                    */
/* ============================================ */

.rs-cta {
    background: var(--v-amber);
    padding: 80px 40px;
}

.rs-cta-inner {
    max-width: 1240px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 48px;
    align-items: center;
}

.rs-cta-eyebrow {
    font-family: var(--v-mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(14, 17, 22, 0.6);
    margin-bottom: 14px;
}

.rs-cta-headline {
    font-family: var(--v-display);
    font-size: clamp(28px, 3.4vw, 44px);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.02em;
    color: var(--v-ink);
    margin: 0;
    max-width: 24ch;
}

.rs-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 28px;
    background: var(--v-ink);
    color: #ffffff;
    font-family: var(--v-sans);
    font-weight: 700;
    font-size: 15px;
    letter-spacing: 0.02em;
    text-decoration: none;
    border-radius: 999px;
    transition: transform 160ms ease, background 160ms ease;
}

.rs-cta-btn:hover {
    background: #000;
    transform: translateY(-1px);
}

.rs-cta-btn svg { transition: transform 160ms ease; }
.rs-cta-btn:hover svg { transform: translateX(3px); }

@media (max-width: 820px) {
    .rs-cta { padding: 64px 22px; }
    .rs-cta-inner {
        grid-template-columns: 1fr;
        gap: 28px;
    }
}

/* ============================================ */
/* Hidden state for tier-toggle filtering       */
/* ============================================ */

[data-tier-hidden="true"] { display: none !important; }

/* When a whole sub-block is empty due to filter, fade gracefully */
.rs-sub-block[data-empty="true"] { display: none; }

/* ============================================ */
/* Per-domain detail page                       */
/* ============================================ */
/* Used by /research/<id> and /de/research/<id>.*/
/* Adds: breadcrumb, domain hero, prev/next nav.*/
/* The featured/reference/background blocks    */
/* below the hero reuse the index-page styles. */

.rs-domain-hero {
    background: #ffffff;
    border-bottom: 1px solid var(--v-line);
}

.rs-domain-hero-inner {
    max-width: 1240px;
    margin: 0 auto;
    padding: 96px 40px 64px;
}

.rs-breadcrumb {
    font-family: var(--v-mono);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--v-ink-3);
    margin-bottom: 40px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.rs-breadcrumb a {
    color: var(--v-ink-3);
    text-decoration: none;
    padding-bottom: 2px;
    border-bottom: 1px solid var(--v-line);
    transition: color 140ms ease, border-color 140ms ease;
}

.rs-breadcrumb a:hover {
    color: var(--v-amber-deep);
    border-bottom-color: var(--v-amber);
}

.rs-breadcrumb-sep { color: var(--v-line); }
.rs-breadcrumb-now { color: var(--v-ink); }

.rs-domain-hero-eyebrow {
    font-family: var(--v-mono);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--v-amber-deep);
    margin: 0 0 24px;
    display: inline-flex;
    align-items: center;
    gap: 14px;
}

.rs-domain-hero-eyebrow::before {
    content: '';
    width: 22px;
    height: 1px;
    background: var(--v-amber);
}

.rs-domain-hero-grid {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    margin-bottom: 48px;
    text-align: center;
}

.rs-domain-hero-num {
    font-family: var(--v-mono);
    font-size: clamp(72px, 10vw, 144px);
    line-height: 0.85;
    color: var(--v-amber);
    font-weight: 400;
    letter-spacing: -0.03em;
}

.rs-domain-hero-title {
    font-family: var(--v-display);
    font-size: clamp(48px, 6vw, 88px);
    line-height: 0.96;
    letter-spacing: -0.03em;
    font-weight: 900;
    color: var(--v-ink);
    margin: 0 auto 22px;
    max-width: 18ch;
}

.rs-domain-hero-title .rs-period { color: var(--v-amber); }

.rs-domain-hero-blurb {
    font-family: var(--v-sans);
    font-size: clamp(17px, 1.5vw, 21px);
    line-height: 1.5;
    color: var(--v-ink-2);
    max-width: 60ch;
    margin: 0 auto;
    font-weight: 400;
}

.rs-domain-hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    padding-top: 36px;
    border-top: 1px solid var(--v-line);
}

@media (max-width: 820px) {
    .rs-domain-hero-inner { padding: 72px 22px 48px; }
    .rs-domain-hero-grid {
        gap: 16px;
    }
    .rs-domain-hero-num { font-size: 80px; }
    .rs-domain-hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}

/* On the detail page, the .rs-domain section sits below the dedicated
   hero, so it doesn't render its own large number/title header — only
   the sub-blocks. Hide the header that the index template normally shows
   above each domain section. The detail partial intentionally omits the
   header, so no override needed; this block exists only to scope-reset
   spacing for the first sub-block on a detail page. */
.rs-domain-hero + .rs-domain .rs-domain-inner { padding-top: 56px; }

/* ============================================ */
/* Per-domain prev/next nav                     */
/* ============================================ */

.rs-domain-nav {
    background: #ffffff;
    border-top: 1px solid var(--v-line);
    padding: 32px 40px;
}

.rs-domain-nav-inner {
    max-width: 1240px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 24px;
    align-items: center;
}

.rs-domain-nav-link {
    display: inline-flex;
    flex-direction: column;
    gap: 6px;
    text-decoration: none;
    color: var(--v-ink);
    padding: 14px 18px;
    border-radius: 8px;
    transition: background 140ms ease;
    max-width: 100%;
    min-width: 0;
}

.rs-domain-nav-link:hover { background: rgba(255, 163, 23, 0.06); }

.rs-domain-nav-prev { justify-self: start; text-align: left; }
.rs-domain-nav-next { justify-self: end; text-align: right; }
.rs-domain-nav-link.is-empty { background: transparent; cursor: default; }

.rs-domain-nav-label {
    font-family: var(--v-mono);
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--v-ink-3);
}

.rs-domain-nav-title {
    font-family: var(--v-display);
    font-size: clamp(16px, 1.4vw, 19px);
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--v-ink);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: color 140ms ease;
}

.rs-domain-nav-link:hover .rs-domain-nav-title { color: var(--v-amber-deep); }
.rs-domain-nav-link svg { transition: transform 140ms ease; flex-shrink: 0; }
.rs-domain-nav-prev:hover svg { transform: translateX(-3px); }
.rs-domain-nav-next:hover svg { transform: translateX(3px); }

.rs-domain-nav-back {
    justify-self: center;
    font-family: var(--v-mono);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--v-ink-3);
    text-decoration: none;
    padding: 10px 20px;
    border: 1px solid var(--v-line);
    border-radius: 999px;
    transition: color 140ms ease, border-color 140ms ease, background 140ms ease;
    white-space: nowrap;
}

.rs-domain-nav-back:hover {
    color: var(--v-ink);
    border-color: var(--v-ink-3);
    background: rgba(255, 163, 23, 0.04);
}

@media (max-width: 820px) {
    .rs-domain-nav { padding: 28px 22px; }
    .rs-domain-nav-inner {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    .rs-domain-nav-prev,
    .rs-domain-nav-next,
    .rs-domain-nav-back {
        justify-self: stretch;
        text-align: left;
    }
    .rs-domain-nav-back { text-align: center; order: 99; }
    .rs-domain-nav-link.is-empty { display: none; }
}

/* ============================================ */
/* Index page: domain headers are now real links*/
/* ============================================ */
/* Apply on the INDEX only — the detail page    */
/* doesn't render this header block.            */

.rs-domain-titleblock a.rs-domain-titlelink {
    text-decoration: none;
    color: inherit;
    display: inline-flex;
    align-items: baseline;
    gap: 14px;
    transition: color 140ms ease;
}

.rs-domain-titleblock a.rs-domain-titlelink:hover {
    color: var(--v-amber-deep);
}

.rs-domain-titleblock .rs-domain-arrow {
    font-family: var(--v-mono);
    font-size: 14px;
    color: var(--v-ink-3);
    transition: color 140ms ease, transform 140ms ease;
}

.rs-domain-titleblock a.rs-domain-titlelink:hover .rs-domain-arrow {
    color: var(--v-amber);
    transform: translateX(4px);
}

/* ============================================ */
/* Per-note detail page                          */
/* ============================================ */
/* One page per consolidated research note.      */
/* Layout: breadcrumb hero + 2-col body/aside    */
/* + siblings strip + prev/next + CTA.           */
/* No card frames, no section bands — separation */
/* via whitespace and 1px hairlines.             */

.rs-note-page { background: #ffffff; }

.rs-note-hero {
    background: #ffffff;
    border-bottom: 1px solid var(--v-line);
}

.rs-note-hero-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 96px 40px 56px;
    text-align: center;
}

.rs-note-hero-meta {
    font-family: var(--v-mono);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--v-ink-3);
    margin: 0 0 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.rs-note-hero-tier {
    color: var(--v-amber-deep);
}

.rs-note-hero-dot { color: var(--v-line); }

.rs-note-hero-domain a {
    color: var(--v-ink-3);
    text-decoration: none;
    padding-bottom: 2px;
    border-bottom: 1px solid var(--v-line);
    transition: color 140ms ease, border-color 140ms ease;
}

.rs-note-hero-domain a:hover {
    color: var(--v-amber-deep);
    border-bottom-color: var(--v-amber);
}

.rs-note-hero-title {
    font-family: var(--v-display);
    font-size: clamp(40px, 5.2vw, 72px);
    line-height: 1.0;
    letter-spacing: -0.028em;
    font-weight: 900;
    color: var(--v-ink);
    margin: 0 auto 28px;
    max-width: 22ch;
}

.rs-note-hero-title .rs-period { color: var(--v-amber); }

.rs-note-hero-lead {
    font-family: var(--v-sans);
    font-size: clamp(17px, 1.5vw, 21px);
    line-height: 1.55;
    color: var(--v-ink-2);
    max-width: 62ch;
    margin: 0 auto;
    font-weight: 400;
}

/* ──────────────────────────────────────────── */
/* Content grid: body + side                    */

.rs-note-content {
    background: #ffffff;
}

.rs-note-content-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 72px 40px 64px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 80px;
    align-items: start;
}

.rs-note-section-heading {
    font-family: var(--v-mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--v-ink-3);
    margin: 0 0 22px;
}

.rs-note-body {}

.rs-note-body p {
    font-family: var(--v-sans);
    font-size: clamp(16px, 1.15vw, 18px);
    line-height: 1.7;
    color: var(--v-ink);
    margin: 0 0 20px;
    font-weight: 400;
    max-width: 64ch;
}

.rs-note-body p:last-child { margin-bottom: 0; }

.rs-note-body h2 {
    font-family: var(--v-display);
    font-size: clamp(22px, 1.9vw, 28px);
    line-height: 1.2;
    letter-spacing: -0.01em;
    font-weight: 700;
    color: var(--v-ink);
    margin: 48px 0 18px;
    padding-top: 24px;
    border-top: 1px solid var(--v-line);
}

.rs-note-body h2:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.rs-note-body h3 {
    font-family: var(--v-display);
    font-size: clamp(17px, 1.4vw, 20px);
    line-height: 1.3;
    letter-spacing: -0.005em;
    font-weight: 700;
    color: var(--v-ink);
    margin: 28px 0 10px;
}

.rs-note-body ul,
.rs-note-body ol {
    font-family: var(--v-sans);
    font-size: clamp(16px, 1.15vw, 18px);
    line-height: 1.6;
    color: var(--v-ink);
    margin: 0 0 22px;
    padding-left: 22px;
    max-width: 64ch;
}

.rs-note-body li {
    margin: 0 0 10px;
}

.rs-note-body li > strong:first-child {
    color: var(--v-ink);
    font-weight: 700;
}

.rs-note-body ul li::marker { color: var(--v-amber); }
.rs-note-body ol li::marker { color: var(--v-ink-3); font-family: var(--v-mono); font-size: 0.9em; }

.rs-note-body code {
    font-family: var(--v-mono);
    font-size: 0.88em;
    background: var(--v-line-soft);
    color: var(--v-ink);
    padding: 1px 6px;
    border-radius: 4px;
    border: 1px solid var(--v-line);
    white-space: nowrap;
}

.rs-note-body strong {
    color: var(--v-ink);
    font-weight: 700;
}

.rs-note-body em {
    color: var(--v-ink-2);
    font-style: italic;
}

/* Decision-rule callout used at the end of many sections. */
.rs-note-body .rs-rule {
    font-family: var(--v-sans);
    font-size: 15px;
    line-height: 1.55;
    color: var(--v-ink-2);
    margin: 16px 0 22px;
    padding: 14px 18px;
    background: var(--v-amber-soft);
    border-left: 3px solid var(--v-amber);
    border-radius: 0 4px 4px 0;
    max-width: 64ch;
}

.rs-note-body .rs-rule strong {
    font-family: var(--v-mono);
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--v-amber-deep);
    display: block;
    margin-bottom: 4px;
}

/* Side rail with metadata */
.rs-note-side {
    display: flex;
    flex-direction: column;
    gap: 32px;
    position: sticky;
    top: 120px;
    align-self: start;
}

.rs-note-side-block {
    padding-top: 18px;
    border-top: 1px solid var(--v-line);
}

.rs-note-side-block:first-child {
    padding-top: 0;
    border-top: none;
}

.rs-note-side-label {
    font-family: var(--v-mono);
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--v-ink-3);
    margin: 0 0 12px;
}

.rs-note-side-value {
    font-family: var(--v-sans);
    font-size: 15px;
    line-height: 1.45;
    color: var(--v-ink);
    margin: 0;
    font-weight: 500;
}

.rs-note-side-value a {
    color: var(--v-ink);
    text-decoration: none;
    border-bottom: 1px solid var(--v-line);
    padding-bottom: 1px;
    transition: color 140ms ease, border-color 140ms ease;
}

.rs-note-side-value a:hover {
    color: var(--v-amber-deep);
    border-bottom-color: var(--v-amber);
}

.rs-note-side-muted { color: var(--v-ink-3); font-style: italic; }

.rs-note-side-phases {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.rs-note-side-glossary-link {
    font-family: var(--v-mono);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--v-ink);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: color 140ms ease;
}

.rs-note-side-glossary-link:hover { color: var(--v-amber-deep); }
.rs-note-side-glossary-link svg { transition: transform 140ms ease; }
.rs-note-side-glossary-link:hover svg { transform: translateX(3px); }

/* ──────────────────────────────────────────── */
/* Siblings strip                               */

.rs-note-siblings {
    background: #ffffff;
    border-top: 1px solid var(--v-line);
}

.rs-note-siblings-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 64px 40px 56px;
}

.rs-note-siblings-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 0;
    border-top: 1px solid var(--v-line);
}

.rs-note-siblings-list li {
    border-bottom: 1px solid var(--v-line);
    border-right: 1px solid var(--v-line);
}

.rs-note-siblings-list li a {
    display: block;
    padding: 22px 24px;
    text-decoration: none;
    color: var(--v-ink);
    transition: background 140ms ease, color 140ms ease;
    height: 100%;
}

.rs-note-siblings-list li a:hover {
    background: rgba(255, 163, 23, 0.05);
    color: var(--v-amber-deep);
}

.rs-note-siblings-tier {
    display: block;
    font-family: var(--v-mono);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--v-ink-3);
    margin-bottom: 8px;
}

.rs-note-siblings-tier[data-tier="1"] { color: var(--v-amber-deep); }

.rs-note-siblings-title {
    display: block;
    font-family: var(--v-display);
    font-size: 17px;
    line-height: 1.25;
    font-weight: 600;
    letter-spacing: -0.01em;
}

/* ──────────────────────────────────────────── */
/* Tier-specific accents on the note hero       */

.rs-note-page.is-tier-1 .rs-note-hero-tier { color: var(--v-amber-deep); }
.rs-note-page.is-tier-2 .rs-note-hero-tier { color: var(--v-ink); }
.rs-note-page.is-tier-3 .rs-note-hero-tier { color: var(--v-ink-3); }

/* ──────────────────────────────────────────── */
/* Mobile                                       */

@media (max-width: 900px) {
    .rs-note-hero-inner { padding: 72px 22px 40px; }
    .rs-note-hero-title { font-size: 36px; }
    .rs-note-content-inner {
        grid-template-columns: 1fr;
        gap: 56px;
        padding: 48px 22px 48px;
    }
    .rs-note-side {
        position: static;
        order: -1;
        padding-bottom: 32px;
        border-bottom: 1px solid var(--v-line);
    }
    .rs-note-siblings-inner { padding: 48px 22px; }
    .rs-note-siblings-list { grid-template-columns: 1fr; }
    .rs-note-siblings-list li { border-right: none; }
}

/* ============================================ */
/* Domain page: note titles now link to detail   */
/* ============================================ */

.rs-note-title-link,
.rs-ref-title-link,
.rs-bg-title-link {
    color: inherit;
    text-decoration: none;
    transition: color 140ms ease;
    display: inline-flex;
    align-items: baseline;
    gap: 8px;
}

.rs-note-title-link:hover,
.rs-ref-title-link:hover,
.rs-bg-title-link:hover {
    color: var(--v-amber-deep);
}

.rs-note-link-arrow {
    font-family: var(--v-mono);
    font-size: 13px;
    color: var(--v-ink-3);
    transition: color 140ms ease, transform 140ms ease;
}

.rs-note-title-link:hover .rs-note-link-arrow,
.rs-ref-title-link:hover .rs-note-link-arrow,
.rs-bg-title-link:hover .rs-note-link-arrow {
    color: var(--v-amber);
    transform: translateX(3px);
}