/* style.css - Signal Architect Group
   Design tokens are injected as CSS custom properties via site_tokens_css(). */

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    padding-top: var(--header-height, 76px);
    background: var(--color-bg, #fff);
    color: var(--color-text, #161B22);
    font-family: var(--font-body, sans-serif);
    font-size: 1rem;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    font-family: var(--font-display, sans-serif);
    font-weight: 300;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin: 0 0 0.6em;
}

p { margin: 0 0 1em; }

a { color: var(--color-accent-strong, #D98A22); text-decoration: underline; }
a:hover { color: var(--color-accent, #EFA23B); }

img { max-width: 100%; height: auto; display: block; }

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--color-navy);
    color: #fff;
    padding: 0.75rem 1.25rem;
    z-index: 1000;
}
.skip-link:focus { left: 0; }

.eyebrow {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
}

.section { padding: 5rem 0; }
.section--tight { padding: 3.5rem 0; }
.section--navy { background: var(--color-navy); color: var(--color-navy-text); }
.section--panel { background: var(--color-panel); }
.section-inner {
    max-width: var(--content-width, 1200px);
    margin: 0 auto;
    padding: 0 1.5rem;
}
.section-head { max-width: 720px; margin-bottom: 3rem; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); margin-bottom: 0.5rem; }
.section-head p { color: var(--color-text-muted); font-size: 1.05rem; }
.section--navy .section-head p { color: var(--color-navy-text-muted); }

/* ── Buttons ───────────────────────────────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 1.5rem;
    border-radius: var(--radius-small, 7px);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    white-space: nowrap;
}
.btn--small { padding: 0.55rem 1.1rem; font-size: 0.8rem; }
.btn--primary { background: var(--color-accent); color: var(--color-accent-text); }
.btn--primary:hover { background: var(--color-accent-strong); color: var(--color-accent-text); }
.btn--outline-dark { border-color: var(--color-navy-border); color: var(--color-navy-text); background: transparent; }
.btn--outline-dark:hover { border-color: var(--color-accent); color: var(--color-accent); }
.btn--outline-light { border-color: var(--color-border); color: var(--color-text); background: transparent; }
.btn--outline-light:hover { border-color: var(--color-accent-strong); color: var(--color-accent-strong); }
.btn--link { background: none; border: none; padding: 0; color: var(--color-accent-strong); font-weight: 700; }

/* ── Header ────────────────────────────────────────────────────────────────── */

.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-height, 76px);
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--color-border);
    z-index: 200;
}

.site-header__inner {
    max-width: var(--content-width, 1200px);
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--color-text);
    flex-shrink: 0;
}
.site-logo__wordmark {
    display: flex;
    flex-direction: column;
    line-height: 1.05;
    font-family: var(--font-display);
}
.site-logo__line1 {
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}
.site-logo__line2 {
    font-size: 0.62rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    color: var(--color-text-muted);
}

/* ── Navigation ────────────────────────────────────────────────────────────── */

.site-nav { margin-left: auto; }

.site-nav__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 1.75rem;
    align-items: center;
}

.site-nav__list a {
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 500;
    transition: color 0.15s;
}

.site-nav__list a:hover,
.site-nav__list a.is-active { color: var(--color-accent-strong); }

.site-nav__item--has-dropdown { position: relative; }

.nav-chevron::after { content: ' \25BE'; font-size: 0.7em; }

/* Dropdown hover-gap fix: the outer .nav-dropdown is the real hit area and
   starts flush at top:100%; its padding-top is transparent, extending the
   hitbox up through the visual gap so the pointer never leaves hoverable
   territory between the nav link and the panel below it. */
.nav-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    padding-top: 14px;
    z-index: 250;
}
.site-nav__item--has-dropdown:hover .nav-dropdown,
.site-nav__item--has-dropdown:focus-within .nav-dropdown { display: block; }

.nav-dropdown__panel {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
    padding: 0.6rem 0;
    min-width: 210px;
    list-style: none;
    margin: 0;
    box-shadow: var(--shadow-card);
}

.nav-dropdown__panel li a {
    display: block;
    padding: 0.55rem 1.1rem;
    white-space: nowrap;
    font-size: 0.85rem;
    color: var(--color-text);
}
.nav-dropdown__panel li a:hover { color: var(--color-accent-strong); background: var(--color-panel); }

.site-nav__item--cta { margin-left: 0.25rem; }

/* Mobile nav toggle */
.site-nav-toggle {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    width: 46px;
    height: 46px;
    margin-left: auto;
    background: var(--color-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-small);
    color: var(--color-text);
    cursor: pointer;
}
.site-nav-toggle__label {
    font-size: 8px;
    font-weight: 700;
    letter-spacing: 0.08em;
    line-height: 1;
    color: inherit;
    margin-top: 1px;
}

/* ── Breadcrumbs ───────────────────────────────────────────────────────────── */

.breadcrumbs { border-bottom: 1px solid var(--color-border); background: var(--color-panel); }
.breadcrumbs__inner {
    max-width: var(--content-width, 1200px);
    margin: 0 auto;
    padding: 0.85rem 1.5rem;
}
.breadcrumbs__list {
    list-style: none;
    margin: 0; padding: 0;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}
.breadcrumbs__list a { color: var(--color-text-muted); text-decoration: none; }
.breadcrumbs__list a:hover { color: var(--color-accent-strong); }
.breadcrumbs__item + .breadcrumbs__item::before { content: '/'; margin-right: 0.5rem; }
.breadcrumbs__item.is-current { color: var(--color-text); }

/* ── Hero ──────────────────────────────────────────────────────────────────── */

.hero {
    background: radial-gradient(circle at 78% 30%, var(--color-navy-soft) 0%, var(--color-navy) 55%);
    color: var(--color-navy-text);
    padding: 4.5rem 0 5rem;
}
.hero__inner {
    max-width: var(--content-width, 1200px);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 3rem;
    align-items: center;
}
.hero__eyebrow { color: var(--color-accent); }
.hero h1 { font-size: clamp(2rem, 4vw, 3rem); color: #fff; margin-bottom: 0.75rem; }
.hero__sub { font-size: 1.1rem; color: var(--color-navy-text-muted); max-width: 46ch; margin-bottom: 2rem; }
.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-graphic { position: relative; aspect-ratio: 1 / 0.82; }
.hero-graphic__node {
    position: absolute;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-navy-text);
    background: rgba(17,26,49,0.85);
    border: 1px solid var(--color-navy-border);
    border-radius: 999px;
    padding: 0.35rem 0.85rem;
    white-space: nowrap;
}

/* ── Signal strip ──────────────────────────────────────────────────────────── */

.signal-strip {
    background: var(--color-navy-soft);
    color: var(--color-navy-text-muted);
    padding: 1.1rem 0;
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    text-align: center;
}

/* ── Card grids ────────────────────────────────────────────────────────────── */

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
}
.card-grid--2 { grid-template-columns: repeat(2, 1fr); }
.card-grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-large);
    padding: 2rem 1.75rem;
    box-shadow: var(--shadow-card);
}
.card--flat { box-shadow: none; }
.card h3 { font-size: 1.05rem; margin-bottom: 0.5rem; }
.card p { color: var(--color-text-muted); font-size: 0.92rem; margin-bottom: 0; }
.card__icon { width: 40px; height: 40px; margin-bottom: 1.1rem; color: var(--color-accent-strong); }

/* ── Ecosystem (dark portfolio strip) ─────────────────────────────────────── */

.ecosystem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}
.ecosystem-card {
    background: var(--color-navy-soft);
    border: 1px solid var(--color-navy-border);
    border-radius: var(--radius-medium);
    padding: 1.75rem;
}
.ecosystem-card__mark {
    width: 40px; height: 40px;
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700;
    background: var(--color-navy);
    border: 1px solid var(--color-navy-border);
    color: var(--color-accent);
    margin-bottom: 1rem;
}
.ecosystem-card h3 { color: var(--color-navy-text); font-size: 1rem; margin-bottom: 0.4rem; }
.ecosystem-card p { color: var(--color-navy-text-muted); font-size: 0.88rem; }
.ecosystem-card a { font-size: 0.82rem; font-weight: 700; text-decoration: none; }
.ecosystem-card__badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--color-accent);
}

/* ── Article / insight cards ───────────────────────────────────────────────── */

.insight-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.75rem; }
.insight-card { text-decoration: none; color: inherit; display: block; }
.insight-card__thumb {
    aspect-ratio: 16/10;
    border-radius: var(--radius-medium);
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-soft) 60%, var(--color-graph-blue) 140%);
    margin-bottom: 1rem;
    position: relative;
    overflow: hidden;
}
.insight-card__thumb::after {
    content: '';
    position: absolute; inset: 0;
    background-image: radial-gradient(circle, rgba(239,162,59,0.55) 1px, transparent 1.5px);
    background-size: 22px 22px;
    opacity: 0.5;
}
.insight-card .eyebrow { margin-bottom: 0.4rem; }
.insight-card h3 { font-size: 1.02rem; margin-bottom: 0.35rem; text-decoration: none; color: var(--color-text); }
.insight-card__meta { font-size: 0.78rem; color: var(--color-text-muted); }

.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 2.5rem;
}
.filter-tabs a {
    display: inline-block;
    padding: 0.45rem 1rem;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 600;
}
.filter-tabs a.is-active,
.filter-tabs a:hover { border-color: var(--color-accent-strong); color: var(--color-accent-strong); }

/* ── CTA banner ────────────────────────────────────────────────────────────── */

.cta-banner {
    background: var(--color-navy);
    color: var(--color-navy-text);
    border-radius: var(--radius-large);
    padding: 3rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    flex-wrap: wrap;
}
.cta-banner h2 { color: #fff; margin-bottom: 0.5rem; font-size: 1.6rem; }
.cta-banner p { color: var(--color-navy-text-muted); margin-bottom: 0; max-width: 46ch; }

/* ── Directory / Case studies / Glossary hubs ─────────────────────────────── */

.constellation-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.constellation-card {
    display: block;
    text-decoration: none;
    color: inherit;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
    padding: 1.75rem;
    box-shadow: var(--shadow-card);
}
.constellation-card h3 { font-size: 1.05rem; margin-bottom: 0.4rem; color: var(--color-text); }
.constellation-card p { color: var(--color-text-muted); font-size: 0.9rem; margin-bottom: 0; }
.constellation-card__count { font-size: 0.75rem; font-weight: 700; color: var(--color-accent-strong); text-transform: uppercase; letter-spacing: 0.06em; }

.listing-table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
.listing-table th, .listing-table td {
    text-align: left;
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9rem;
}
.listing-table th { color: var(--color-text-muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; }
.listing-table tr:last-child td { border-bottom: none; }

.fields-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; margin: 2rem 0; }
.field-item { background: var(--color-panel); border-radius: var(--radius-small); padding: 1rem 1.25rem; }
.field-item__label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-muted); margin-bottom: 0.25rem; }
.field-item__value a { word-break: break-word; }

.az-index { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 2.5rem; }
.az-index a {
    width: 32px; height: 32px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 6px;
    background: var(--color-panel);
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
}
.az-index a:hover { background: var(--color-accent); color: var(--color-accent-text); }

.glossary-group { margin-bottom: 2.5rem; }
.glossary-group__letter {
    font-family: var(--font-display);
    font-size: 1.4rem;
    color: var(--color-accent-strong);
    margin-bottom: 1rem;
}
.glossary-term-row { padding: 1rem 0; border-bottom: 1px solid var(--color-border); }
.glossary-term-row a { font-weight: 600; font-size: 1.02rem; text-decoration: none; color: var(--color-text); }
.glossary-term-row a:hover { color: var(--color-accent-strong); }
.glossary-term-row p { margin: 0.35rem 0 0; color: var(--color-text-muted); font-size: 0.9rem; }

.related-terms { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.related-terms a {
    display: inline-block;
    padding: 0.4rem 0.9rem;
    border-radius: 999px;
    background: var(--color-panel);
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.82rem;
}
.related-terms a:hover { background: var(--color-accent); color: var(--color-accent-text); }

/* ── FAQ accordion ─────────────────────────────────────────────────────────── */

.faq-group { margin-bottom: 2.5rem; }
.faq-group__heading { font-size: 1.1rem; color: var(--color-accent-strong); margin-bottom: 1rem; }
.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
    margin-bottom: 0.75rem;
    background: #fff;
}
.faq-item summary {
    cursor: pointer;
    padding: 1.1rem 1.4rem;
    font-weight: 600;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 1.3rem; color: var(--color-accent-strong); font-weight: 400; }
.faq-item[open] summary::after { content: '\2212'; }
.faq-item__body { padding: 0 1.4rem 1.25rem; color: var(--color-text-muted); }

/* ── Library ───────────────────────────────────────────────────────────────── */

.library-toc { margin: 2rem 0; }
.library-toc summary { cursor: pointer; font-weight: 700; padding: 0.75rem 0; }
.library-toc ul { list-style: none; margin: 0; padding: 0; columns: 2; gap: 2rem; }
.library-toc li { margin-bottom: 0.5rem; }
.library-toc a { font-size: 0.9rem; text-decoration: none; }

/* ── About ─────────────────────────────────────────────────────────────────── */

.about-hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 3rem; align-items: center; }
.about-pillars { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

/* ── Framework steps ───────────────────────────────────────────────────────── */

.framework-steps { display: flex; flex-direction: column; gap: 1.75rem; max-width: 760px; }
.framework-step { display: flex; gap: 1.5rem; align-items: flex-start; }
.framework-step__num {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 300;
    color: var(--color-accent-strong);
    min-width: 3rem;
}
.framework-step h3 { font-size: 1.05rem; margin-bottom: 0.3rem; }
.framework-step p { color: var(--color-text-muted); margin-bottom: 0; }

/* ── Contact ───────────────────────────────────────────────────────────────── */

.contact-split {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    border-radius: var(--radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}
.contact-split__info {
    background: var(--color-navy);
    color: var(--color-navy-text);
    padding: 3rem;
}
.contact-split__info h2 { color: #fff; }
.contact-split__info p { color: var(--color-navy-text-muted); }
.contact-detail { margin-bottom: 1.25rem; }
.contact-detail__label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-accent); margin-bottom: 0.2rem; }
.contact-detail a { color: var(--color-navy-text); text-decoration: none; }
.contact-split__form { background: #fff; padding: 3rem; }

.form-row { margin-bottom: 1.25rem; }
.form-row label { display: block; font-size: 0.8rem; font-weight: 600; margin-bottom: 0.4rem; }
.form-row input,
.form-row select,
.form-row textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-small);
    font-size: 0.92rem;
    font-family: inherit;
    background: var(--color-panel-soft);
}
.form-row textarea { min-height: 120px; resize: vertical; }
.form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }

/* ── Prose (articles, glossary terms, case studies) ───────────────────────── */

.prose-section { max-width: 760px; margin: 0 auto; }
.prose h2 { font-size: 1.4rem; margin-top: 2rem; }
.prose p { font-size: 1.02rem; }
.prose ul, .prose ol { padding-left: 1.4rem; }

/* ── Footer ────────────────────────────────────────────────────────────────── */

.site-footer {
    background: var(--color-navy);
    color: var(--color-navy-text-muted);
    padding: 4rem 0 1.5rem;
    margin-top: 0;
}
.site-footer__inner { max-width: var(--content-width, 1200px); margin: 0 auto; padding: 0 1.5rem; }
.site-footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}
.site-footer__brand-name { font-family: var(--font-display); font-weight: 300; font-size: 1.2rem; color: #fff; margin-bottom: 0.5rem; }
.site-footer__tagline { font-size: 0.85rem; margin-bottom: 0.75rem; }
.site-footer__contact-line { font-size: 0.85rem; margin: 0 0 0.3rem; }
.site-footer__contact-line a { color: var(--color-navy-text-muted); }
.site-footer__contact-line a:hover { color: var(--color-accent); }
.site-footer__social { display: flex; gap: 0.75rem; margin-top: 1rem; }
.site-footer__social a {
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--color-navy-text-muted);
    border: 1px solid var(--color-navy-border);
    border-radius: 999px;
    padding: 0.4rem 0.75rem;
    text-decoration: none;
}
.site-footer__social a:hover { color: var(--color-accent); border-color: var(--color-accent); }
.site-footer__col-heading { font-weight: 700; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-navy-text); margin-bottom: 1rem; }
.site-footer__links { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.55rem; }
.site-footer__links a { color: var(--color-navy-text-muted); text-decoration: none; font-size: 0.85rem; }
.site-footer__links a:hover { color: var(--color-accent); }
.site-footer__bottom {
    border-top: 1px solid var(--color-navy-border);
    padding-top: 1.25rem;
    font-size: 0.75rem;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* ── Error page ────────────────────────────────────────────────────────────── */

.error-page { text-align: center; padding: 6rem 1.5rem; max-width: 640px; margin: 0 auto; }
.error-page h1 { font-size: 6rem; font-weight: 200; margin: 0 0 0.5rem; color: var(--color-text-muted); }
.error-page p { font-size: 1.1rem; margin-bottom: 2rem; }

/* ── Utility ───────────────────────────────────────────────────────────────── */

.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }

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

@media (max-width: 900px) {
    .hero__inner { grid-template-columns: 1fr; }
    .hero-graphic { display: none; }
    .card-grid, .card-grid--4 { grid-template-columns: repeat(2, 1fr); }
    .ecosystem-grid, .insight-grid, .constellation-grid { grid-template-columns: repeat(2, 1fr); }
    .site-footer__grid { grid-template-columns: 1fr 1fr; }
    .contact-split { grid-template-columns: 1fr; }
    .about-hero-grid { grid-template-columns: 1fr; }
    .about-pillars { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .site-nav-toggle { display: flex; }

    .site-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0; right: 0;
        background: #fff;
        border-bottom: 1px solid var(--color-border);
        padding: 1rem 1.5rem 1.5rem;
        max-height: calc(100vh - var(--header-height, 76px));
        overflow-y: auto;
        z-index: 199;
    }
    .site-header.is-open .site-nav { display: block; }

    .site-nav__list { flex-direction: column; align-items: flex-start; gap: 0; width: 100%; }
    .site-nav__item { width: 100%; padding: 0.6rem 0; border-bottom: 1px solid var(--color-border); }
    .site-nav__item:last-child { border-bottom: none; }
    .site-nav__item--cta { margin-left: 0; padding-top: 1rem; }
    .site-nav__item--cta a.btn { width: 100%; justify-content: center; }

    .nav-dropdown {
        display: contents;
    }
    .nav-dropdown__panel {
        position: static;
        box-shadow: none;
        border: none;
        padding: 0.5rem 0 0 1rem;
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
    }

    .card-grid, .card-grid--2, .card-grid--4,
    .ecosystem-grid, .insight-grid, .constellation-grid { grid-template-columns: 1fr; }

    .cta-banner { flex-direction: column; text-align: center; }
    .library-toc ul { columns: 1; }

    /* Footer: single column, ~2x text per brand requirement */
    .site-footer__grid { grid-template-columns: 1fr; gap: 2.25rem; }
    .site-footer__bottom { flex-direction: column; align-items: flex-start; }

    .site-footer__brand-name { font-size: 1.5rem; }
    .site-footer__tagline,
    .site-footer__contact-line { font-size: 1.7rem; }
    .site-footer__col-heading { font-size: 1.5rem; }
    .site-footer__links a { font-size: 1.7rem; }
    .site-footer__social a { font-size: 1.36rem; padding: 0.6rem 1rem; }
    .site-footer__bottom { font-size: 1.5rem; }

    .form-grid-2 { grid-template-columns: 1fr; }
}