/* ============================================================
   AS400IBMSystems.com — Main Stylesheet
   Dark navy IBM-adjacent technical library
   ============================================================ */

/* ── Custom Properties ─────────────────────────────────────── */
:root {
  --bg:            #070f1e;
  --bg-alt:        #0c1627;
  --surface:       #0f1e33;
  --surface-hover: #162540;
  --border:        #1a3050;
  --border-light:  #243d60;

  --blue:          #1565c0;
  --blue-mid:      #1976d2;
  --blue-bright:   #42a5f5;
  --electric:      #29b6f6;
  --electric-dim:  #0288d1;
  --accent:        #f59e0b;
  --accent-hover:  #fbbf24;
  --success:       #22c55e;

  --text:          #dde6f0;
  --text-mid:      #94afc8;
  --text-dim:      #546e87;
  --white:         #ffffff;

  --header-height: 58px;
  --max-w:         1200px;
  --max-w-narrow:  860px;
  --r:             6px;
  --r-lg:          10px;

  --font-head: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 1rem;
  padding-top: var(--header-height);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-main { flex: 1; }

img { max-width: 100%; height: auto; display: block; }
a { color: var(--electric); text-decoration: none; }
a:hover { color: var(--blue-bright); }
ul { list-style: none; }
h1,h2,h3,h4,h5 {
  font-family: var(--font-head);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--white);
}

/* ── Container ─────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Header / Nav ──────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-height);
  background: rgba(5, 12, 28, 0.97);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  backdrop-filter: blur(6px);
}

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

.site-logo {
  display: flex;
  align-items: baseline;
  gap: 0;
  flex-shrink: 0;
  font-family: var(--font-head);
  font-weight: 200;
  letter-spacing: -0.02em;
  color: var(--white);
  text-decoration: none;
}

.site-logo:hover { color: var(--white); }
.site-logo__as  { color: var(--electric); font-size: 1rem; font-weight: 600; }
.site-logo__ibm { color: var(--white); font-size: 1rem; }
.site-logo__tld { color: var(--text-dim); font-size: 0.85rem; }

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

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav__item a {
  display: block;
  padding: 0.35rem 0.75rem;
  font-size: 0.875rem;
  color: var(--text-mid);
  border-radius: var(--r);
  transition: color 0.15s;
  white-space: nowrap;
}

.site-nav__item a:hover,
.site-nav__item a.is-active { color: var(--white); }

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  margin-left: auto;
  padding: 0 4px;
}

.nav-hamburger__label {
  font-size: 0.55rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  line-height: 1;
  margin-top: 4px;
}

.nav-hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-mid);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}

.nav-hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Breadcrumbs ───────────────────────────────────────────── */
.breadcrumb-bar {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  padding: 0.6rem 0;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.breadcrumbs__item a { color: var(--text-dim); }
.breadcrumbs__item a:hover { color: var(--electric); }
.breadcrumbs__item.is-current { color: var(--text-mid); }
.breadcrumbs__sep { margin: 0 0.25rem; }

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--r);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  text-decoration: none;
  white-space: nowrap;
}

.btn--primary {
  background: var(--blue);
  color: var(--white);
  border: 1px solid var(--blue);
}
.btn--primary:hover { background: var(--blue-mid); color: var(--white); border-color: var(--blue-mid); }

.btn--outline {
  background: transparent;
  color: var(--electric);
  border: 1px solid var(--border-light);
}
.btn--outline:hover { border-color: var(--electric); color: var(--white); }

.btn--ghost {
  background: transparent;
  color: var(--text-mid);
  border: 1px solid var(--border);
}
.btn--ghost:hover { color: var(--white); border-color: var(--border-light); }

/* ── Sections ──────────────────────────────────────────────── */
.section { padding: 4rem 0; }
.section--alt { background: var(--bg-alt); }

.section-heading {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 1rem;
}

.section-subheading {
  color: var(--text-mid);
  margin-bottom: 2rem;
}

.section-footer {
  margin-top: 2.5rem;
  text-align: center;
}

/* ── Hero ──────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #050d1e 0%, #091628 50%, #0a1e3a 100%);
  border-bottom: 1px solid var(--border);
  padding: 5rem 0;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: center;
}

.hero__eyebrow {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--electric);
  margin-bottom: 0.75rem;
}

.hero__headline {
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: 200;
  line-height: 1.15;
  color: var(--white);
  margin-bottom: 1.25rem;
  max-width: 640px;
}

.hero__sub {
  color: var(--text-mid);
  font-size: 1.05rem;
  max-width: 580px;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero__badge {
  flex-shrink: 0;
}

.hero__badge-inner {
  background: linear-gradient(135deg, var(--blue) 0%, var(--electric-dim) 100%);
  border-radius: var(--r-lg);
  padding: 2rem 2.5rem;
  text-align: center;
  min-width: 180px;
}

.hero__badge-gen {
  font-family: var(--font-head);
  font-size: 2.5rem;
  font-weight: 200;
  color: var(--white);
  letter-spacing: -0.03em;
}

.hero__badge-label {
  font-size: 1rem;
  color: rgba(255,255,255,0.8);
  margin-bottom: 1.25rem;
}

.hero__badge-link {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  color: var(--white);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-size: 0.85rem;
  transition: background 0.15s;
}
.hero__badge-link:hover { background: rgba(255,255,255,0.25); color: var(--white); }

/* ── Section Intro ─────────────────────────────────────────── */
.section-intro {
  max-width: 760px;
  margin-bottom: 3rem;
}
.section-intro__heading {
  font-size: clamp(1.4rem, 2.5vw, 1.875rem);
  margin-bottom: 1rem;
}
.section-intro__body {
  color: var(--text-mid);
  margin-bottom: 0.75rem;
}

/* ── Name Timeline ─────────────────────────────────────────── */
.name-timeline {
  display: flex;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 1rem;
}

.timeline-step {
  flex: 1;
  min-width: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  padding: 0 0.5rem;
}

.timeline-step + .timeline-step::before {
  content: '';
  position: absolute;
  top: 1.75rem;
  left: -50%;
  width: 100%;
  height: 2px;
  background: var(--border);
}

.timeline-step__year {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}

.timeline-step__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--blue);
  border: 2px solid var(--electric);
  margin-bottom: 0.5rem;
  z-index: 1;
}

.timeline-step__name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--white);
  margin-bottom: 0.3rem;
}

.timeline-step__label {
  font-size: 0.75rem;
  color: var(--text-dim);
  line-height: 1.3;
}

/* ── Hub Grid ──────────────────────────────────────────────── */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.hub-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.75rem;
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s, transform 0.15s;
  position: relative;
}

.hub-card:hover {
  border-color: var(--blue);
  background: var(--surface-hover);
  transform: translateY(-2px);
}

.hub-card__icon {
  color: var(--electric);
  margin-bottom: 1rem;
}

.hub-card__eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}

.hub-card__title {
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--white);
  margin-bottom: 0.65rem;
}

.hub-card__desc {
  font-size: 0.875rem;
  color: var(--text-mid);
  line-height: 1.55;
  flex: 1;
}

.hub-card__arrow {
  display: block;
  margin-top: 1.25rem;
  color: var(--electric);
  font-size: 1.1rem;
}

/* ── Two Column Layout ─────────────────────────────────────── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 3rem;
  align-items: start;
}

.quick-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.quick-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  color: var(--text);
  font-size: 0.9rem;
  transition: border-color 0.15s, background 0.15s;
}

.quick-link::before {
  content: '→';
  color: var(--electric);
  flex-shrink: 0;
}

.quick-link:hover {
  border-color: var(--electric);
  background: var(--surface-hover);
  color: var(--white);
}

/* Aside cards */
.aside-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.aside-card--accent {
  border-color: var(--blue);
  background: linear-gradient(135deg, #0d1f3a 0%, #102240 100%);
}

.aside-card__heading {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.aside-card__body {
  font-size: 0.875rem;
  color: var(--text-mid);
  margin-bottom: 1rem;
}

.aside-card__link {
  font-size: 0.875rem;
  color: var(--electric);
  font-weight: 500;
}
.aside-card__link:hover { color: var(--white); }

/* ── Upgrade Section ───────────────────────────────────────── */
.upgrade-section {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3rem;
  align-items: center;
}

.upgrade-section__eyebrow {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.upgrade-section__heading {
  font-size: clamp(1.4rem, 2.5vw, 1.875rem);
  margin-bottom: 1rem;
}

.upgrade-section__body {
  color: var(--text-mid);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.upgrade-section__actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.upgrade-section__path {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.75rem 1.5rem;
}

.path-step {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.path-step__num {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--blue);
  color: var(--white);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

.path-step__label {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--white);
}

.path-step__desc {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.path-arrow {
  text-align: center;
  color: var(--text-dim);
  padding: 0.4rem 0;
  margin-left: 14px;
}

/* ── Article Grid (homepage) ───────────────────────────────── */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.article-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.5rem;
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}

.article-card:hover {
  border-color: var(--blue);
  background: var(--surface-hover);
}

.article-card__meta {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.article-card__title {
  font-size: 1rem;
  font-weight: 400;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.article-card__excerpt {
  font-size: 0.85rem;
  color: var(--text-mid);
  flex: 1;
  line-height: 1.55;
}

.article-card__read {
  display: block;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--electric);
}

/* ── CTA Block ─────────────────────────────────────────────── */
.cta-block {
  padding: 3.5rem 0;
}

.cta-block--primary { background: linear-gradient(135deg, #0e1f3a 0%, #0d2447 100%); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.cta-block--secondary { background: var(--bg-alt); border-top: 1px solid var(--border); }

.cta-block__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  gap: 3rem;
  justify-content: space-between;
}

.cta-block__content { max-width: 600px; }

.cta-block__heading {
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  margin-bottom: 0.75rem;
}

.cta-block__body {
  color: var(--text-mid);
  font-size: 0.95rem;
  line-height: 1.65;
}

.cta-block__btn {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.75rem;
  background: var(--blue);
  color: var(--white);
  border-radius: var(--r);
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.15s;
  text-decoration: none;
}
.cta-block__btn:hover { background: var(--blue-mid); color: var(--white); }

/* ── Page Content ──────────────────────────────────────────── */
.page-content {
  padding: 3rem 1.5rem;
  max-width: var(--max-w);
  margin: 0 auto;
}

.page-content--centered { text-align: center; }

.page-header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.page-header__eyebrow {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--electric);
  margin-bottom: 0.5rem;
}
.page-header__eyebrow a { color: var(--electric); }

.page-header__title {
  font-size: clamp(1.6rem, 3.5vw, 2.5rem);
  margin-bottom: 1rem;
}

.page-header__lead {
  color: var(--text-mid);
  font-size: 1.05rem;
  max-width: 700px;
  line-height: 1.65;
  margin-bottom: 1rem;
}

.page-header__category {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.page-header__meta { margin-top: 1rem; }

.meta-chip {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.25rem 0.65rem;
  font-size: 0.78rem;
  color: var(--text-mid);
}

/* ── Content Section ───────────────────────────────────────── */
.content-section {
  margin-bottom: 2.5rem;
}

.content-section__heading {
  font-size: 1.2rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

/* ── Article Layout ────────────────────────────────────────── */
.article-layout { max-width: var(--max-w-narrow); }

.article-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.article-header__hub {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.article-header__hub a { color: var(--electric); }

.article-header__title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: 0.75rem;
}

.article-header__excerpt {
  color: var(--text-mid);
  font-size: 1rem;
  line-height: 1.65;
  margin-bottom: 0.75rem;
}

.article-header__meta {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.article-section {
  margin-bottom: 2rem;
}

.article-section__heading {
  font-size: 1.3rem;
  margin-bottom: 0.85rem;
}

.article-faq { margin-top: 2.5rem; }

/* ── Prose ─────────────────────────────────────────────────── */
.prose {
  color: var(--text);
  line-height: 1.75;
}

.prose p { margin-bottom: 1.1rem; }
.prose p:last-child { margin-bottom: 0; }

.prose ul, .prose ol {
  margin: 0.85rem 0 1.1rem 1.5rem;
}

.prose li { margin-bottom: 0.4rem; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }

.prose strong { color: var(--white); font-weight: 600; }
.prose a { color: var(--electric); }
.prose a:hover { color: var(--blue-bright); }

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.prose th {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.6rem 0.85rem;
  text-align: left;
  color: var(--white);
  font-weight: 500;
}

.prose td {
  border: 1px solid var(--border);
  padding: 0.6rem 0.85rem;
  color: var(--text-mid);
}

.prose tr:nth-child(even) td { background: var(--bg-alt); }

/* ── Article Related ───────────────────────────────────────── */
.article-related {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.related-block__heading {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.related-block__list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.related-block__list a {
  font-size: 0.9rem;
  color: var(--text-mid);
}
.related-block__list a:hover { color: var(--electric); }

.related-block__list--terms a {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.8rem;
}

/* ── FAQ List ──────────────────────────────────────────────── */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  overflow: hidden;
}

.faq-item[open] { border-color: var(--blue); }

.faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 500;
  color: var(--white);
  font-size: 0.95rem;
  user-select: none;
  list-style: none;
}

.faq-item__q::-webkit-details-marker { display: none; }

.faq-item__q::before {
  content: '+';
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  background: var(--blue);
  color: var(--white);
  border-radius: 3px;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  transition: background 0.15s;
  margin-top: 1px;
}

.faq-item[open] .faq-item__q::before {
  content: '−';
  background: var(--electric-dim);
}

.faq-item__q-num {
  color: var(--text-dim);
  font-weight: 400;
  flex-shrink: 0;
}

.faq-item__a {
  padding: 0 1.25rem 1rem;
  font-size: 0.9rem;
  color: var(--text-mid);
}

.faq-list--page .faq-item__a { color: var(--text); }

/* ── Glossary ──────────────────────────────────────────────── */
.alpha-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: 2.5rem;
}

.alpha-nav__letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
}

.alpha-nav__letter--active {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--electric);
}
.alpha-nav__letter--active:hover {
  border-color: var(--electric);
  color: var(--white);
  background: var(--surface-hover);
}

.alpha-nav__letter--dim {
  color: var(--text-dim);
}

.glossary-section {
  margin-bottom: 2.5rem;
}

.glossary-section__letter {
  font-size: 1rem;
  font-weight: 600;
  color: var(--electric);
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.glossary-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.glossary-entry {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}

.glossary-entry:hover {
  border-color: var(--blue);
  background: var(--surface-hover);
}

.glossary-entry__term {
  font-weight: 500;
  color: var(--white);
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
}

.glossary-entry__aka {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 0.2rem;
}

.glossary-entry__def {
  font-size: 0.85rem;
  color: var(--text-mid);
  line-height: 1.45;
}

.glossary-entry__arrow {
  color: var(--electric);
  flex-shrink: 0;
  margin-top: 2px;
}

/* Glossary term page */
.glossary-term-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.glossary-term-header__eyebrow {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}
.glossary-term-header__eyebrow a { color: var(--electric); }

.glossary-term-header__term {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: 0.5rem;
}

.glossary-term-header__aka {
  font-size: 0.875rem;
  color: var(--text-dim);
}

.glossary-term-short {
  background: var(--surface);
  border-left: 3px solid var(--electric);
  padding: 1.1rem 1.25rem;
  border-radius: 0 var(--r) var(--r) 0;
  margin-bottom: 1.75rem;
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.65;
}

.glossary-term-full { margin-bottom: 2rem; }

/* ── Directory ─────────────────────────────────────────────── */
.dir-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.dir-cat-link {
  padding: 0.35rem 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--text-mid);
  transition: border-color 0.15s, color 0.15s;
}
.dir-cat-link:hover { border-color: var(--electric); color: var(--white); }

.dir-section {
  margin-bottom: 3rem;
}

.dir-section__heading {
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.dir-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.dir-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.5rem;
  text-decoration: none;
  position: relative;
  transition: border-color 0.15s, background 0.15s;
}

.dir-card:hover {
  border-color: var(--blue);
  background: var(--surface-hover);
}

.dir-card--featured { border-color: var(--blue); }

.dir-card__badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--blue);
  color: var(--white);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.dir-card__name {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.dir-card__desc {
  font-size: 0.875rem;
  color: var(--text-mid);
  margin-bottom: 1rem;
  line-height: 1.55;
  flex: 1;
}

.dir-card__specialties {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.dir-card__specialties li {
  font-size: 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  color: var(--text-dim);
}

.dir-card__cta {
  font-size: 0.875rem;
  color: var(--electric);
}

/* Directory listing page */
.listing-block {
  margin-bottom: 2rem;
}

.listing-block__heading {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
}

.listing-block__list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.listing-block__list li {
  font-size: 0.9rem;
  color: var(--text-mid);
  padding-left: 1rem;
  position: relative;
}

.listing-block__list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--electric);
}

.listing-block--note {
  background: var(--surface);
  border-left: 3px solid var(--blue);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--r) var(--r) 0;
}

.listing-block--note p {
  font-size: 0.9rem;
  color: var(--text-mid);
}

.listing-cta { margin-top: 2rem; }

/* ── Library ───────────────────────────────────────────────── */
.library-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.library-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}

.library-row:hover {
  border-color: var(--blue);
  background: var(--surface-hover);
}

.library-row__type {
  flex-shrink: 0;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  min-width: 72px;
  text-align: center;
}

.library-row--blue  .library-row__type { background: rgba(21, 101, 192, 0.2); color: var(--blue-bright); border: 1px solid rgba(21,101,192,0.3); }
.library-row--teal  .library-row__type { background: rgba(41, 182, 246, 0.15); color: var(--electric); border: 1px solid rgba(41,182,246,0.25); }
.library-row--orange .library-row__type { background: rgba(245, 158, 11, 0.15); color: var(--accent); border: 1px solid rgba(245,158,11,0.25); }
.library-row--slate .library-row__type { background: rgba(148, 175, 200, 0.1); color: var(--text-mid); border: 1px solid var(--border); }

.library-row__main { flex: 1; min-width: 0; }

.library-row__title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--white);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.library-row__excerpt {
  font-size: 0.8rem;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.library-row__arrow {
  color: var(--electric);
  flex-shrink: 0;
}

/* ── Hub page topic list ────────────────────────────────────── */
.topic-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.5rem;
}

.topic-list__item {
  padding: 0.5rem 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  font-size: 0.875rem;
  color: var(--text-mid);
}

.topic-list__item::before {
  content: '→ ';
  color: var(--electric);
}

/* Article list (hub page) */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.article-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}

.article-row:hover {
  border-color: var(--blue);
  background: var(--surface-hover);
}

.article-row__title {
  font-size: 1rem;
  font-weight: 400;
  color: var(--white);
  margin-bottom: 0.3rem;
}

.article-row__excerpt {
  font-size: 0.85rem;
  color: var(--text-mid);
}

.article-row__arrow {
  color: var(--electric);
  flex-shrink: 0;
  margin-top: 3px;
}

/* Resource links */
.resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.resource-link {
  padding: 0.5rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  font-size: 0.875rem;
  color: var(--electric);
  transition: border-color 0.15s, background 0.15s;
}
.resource-link:hover { border-color: var(--electric); background: var(--surface-hover); color: var(--white); }

/* FAQ index */
.faq-index {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-index-card {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}

.faq-index-card:hover {
  border-color: var(--blue);
  background: var(--surface-hover);
}

.faq-index-card__title {
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--white);
  margin-bottom: 0.4rem;
}

.faq-index-card__desc {
  font-size: 0.875rem;
  color: var(--text-mid);
  margin-bottom: 0.4rem;
}

.faq-index-card__count {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.faq-index-card__arrow { color: var(--electric); flex-shrink: 0; margin-top: 2px; }

/* ── 404 ───────────────────────────────────────────────────── */
.error-page {
  padding: 4rem 1rem;
  max-width: 600px;
  margin: 0 auto;
}

.error-page__code {
  font-size: 5rem;
  font-weight: 200;
  color: var(--border-light);
  line-height: 1;
  margin-bottom: 1rem;
}

.error-page__title {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.error-page__body {
  color: var(--text-mid);
  margin-bottom: 2rem;
}

.error-page__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

/* ── Empty notice ──────────────────────────────────────────── */
.empty-notice {
  color: var(--text-dim);
  font-size: 0.9rem;
  padding: 2rem;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
}

/* ── Footer ────────────────────────────────────────────────── */
.site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 3rem 0 1.5rem;
}

.site-footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.site-footer__name {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 300;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.site-footer__tagline {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.55;
  margin-bottom: 1.25rem;
}

.site-footer__col-heading {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 0.85rem;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.site-footer__links a {
  font-size: 0.85rem;
  color: var(--text-mid);
  transition: color 0.15s;
}
.site-footer__links a:hover { color: var(--white); }

.site-footer__partner-note {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.site-footer__partner-link {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--electric);
  margin-bottom: 1.25rem;
  font-weight: 500;
}
.site-footer__partner-link:hover { color: var(--white); }

.site-footer__ai-links {
  display: flex;
  gap: 0.75rem;
}
.site-footer__ai-links a {
  font-size: 0.78rem;
  color: var(--text-dim);
}
.site-footer__ai-links a:hover { color: var(--electric); }

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__badge { display: none; }
  .two-col { grid-template-columns: 1fr; }
  .upgrade-section { grid-template-columns: 1fr; }
  .upgrade-section__path { display: none; }
  .site-footer__top { grid-template-columns: 1fr 1fr; }
  .article-related { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .hub-grid { grid-template-columns: 1fr; }
  .article-grid { grid-template-columns: 1fr; }
  .name-timeline { gap: 0; }
  .site-footer__top { grid-template-columns: 1fr; }
  .cta-block__inner { flex-direction: column; }
  .cta-block__btn { width: 100%; justify-content: center; }

  .nav-hamburger { display: flex; }

  .site-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0; right: 0;
    background: rgba(5, 12, 28, 0.98);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem;
    backdrop-filter: blur(6px);
  }

  .site-nav.is-open { display: block; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
  }

  .site-nav__item a {
    padding: 0.75rem 1rem;
    font-size: 1rem;
  }
}