/* ════════════════════════════════════════════════════════════════
   Seqlense Academy - layout & components
   Builds on top of seqlense.css (variables, buttons, footer, nav).
   ════════════════════════════════════════════════════════════════ */

:root {
  --ac-accent: #2A9BC0;
  --ac-accent-dark: #1d7ea3;
  --ac-ink: #0a0a0a;
  --ac-ink-2: #1f1f1f;
  --ac-mute: #555;
  --ac-mute-2: #888;
  --ac-line: rgba(0,0,0,.08);
  --ac-line-soft: rgba(0,0,0,.05);
  --ac-bg: #ffffff;
  --ac-bg-soft: #f9f9f8;
  --ac-bg-side: #fafaf9;
  --ac-radius: 14px;
}

body { background: var(--ac-bg); }

/* ─── HEADER tweaks ────────────────────────────────────────── */
.ac-nav .ac-nav__badge {
  display: inline-block;
  margin-left: .5rem;
  padding: .15rem .5rem;
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ac-accent-dark);
  background: rgba(42,155,192,.1);
  border: 1px solid rgba(42,155,192,.25);
  border-radius: 999px;
  vertical-align: middle;
}
.ac-nav__link {
  color: #333;
  font-size: .875rem;
  font-weight: 500;
  text-decoration: none;
  transition: color .15s ease;
}
.ac-nav__link:hover { color: var(--ac-ink); }

/* ─── SHELL: sidebar + body ────────────────────────────────── */
.ac-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 2rem;
  max-width: 1600px;
  margin: 0 auto;
  padding: 4rem 2rem 4rem;
  align-items: start;
}
.ac-shell--single {
  grid-template-columns: minmax(0,1fr);
  max-width: 1200px;
}

.ac-shell--with-toc {
  grid-template-columns: 260px minmax(0, 1fr) 220px;
  gap: 2.25rem;
}

@media (max-width: 1024px) {
  .ac-shell, .ac-shell--with-toc { grid-template-columns: 1fr; }
  .ac-side { position: static; max-height: none; }
  .ac-toc { display: none; }
}

/* ─── SIDEBAR ──────────────────────────────────────────────── */
.ac-side {
  position: sticky;
  top: 88px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  background: var(--ac-bg-side);
  border: 1px solid var(--ac-line);
  border-radius: var(--ac-radius);
  padding: 1rem .75rem 1.25rem;
  font-size: .875rem;
}
.ac-side__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0 .5rem .75rem;
  border-bottom: 1px solid var(--ac-line-soft);
  margin-bottom: .75rem;
}
.ac-side__title {
  font-weight: 700;
  color: var(--ac-ink);
  font-size: .95rem;
  text-decoration: none;
  letter-spacing: -.01em;
}
.ac-side__count { font-size: .7rem; color: var(--ac-mute-2); }
.ac-side__search {
  width: 100%;
  padding: .5rem .75rem;
  font: inherit;
  font-size: .8125rem;
  border: 1px solid var(--ac-line);
  border-radius: 8px;
  background: #fff;
  margin-bottom: 1rem;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.ac-side__search:focus {
  border-color: var(--ac-accent);
  box-shadow: 0 0 0 3px rgba(42,155,192,.15);
}
.ac-side__group { margin-bottom: 1rem; }
.ac-side__group h4 {
  display: flex;
  align-items: center;
  gap: .4rem;
  margin: 0 .5rem .375rem;
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ac-mute-2);
}
.ac-side__cat-icon {
  flex-shrink: 0;
  color: var(--ac-accent);
}
.ac-side__group ul { list-style: none; padding: 0; margin: 0; }
.ac-side__item a {
  display: block;
  padding: .375rem .625rem;
  border-radius: 6px;
  color: #333;
  text-decoration: none;
  font-size: .8125rem;
  line-height: 1.4;
  transition: background .12s, color .12s;
}
.ac-side__item a:hover { background: rgba(0,0,0,.04); color: var(--ac-ink); }
.ac-side__item.is-active a {
  background: var(--ac-ink);
  color: #fff;
  font-weight: 600;
}

/* ─── ARTICLE BODY ─────────────────────────────────────────── */
.ac-article {
  font-size: 1rem;
  line-height: 1.7;
  color: #2a2a2a;
}
.ac-article__head {
  border-bottom: 1px solid var(--ac-line-soft);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}
.ac-article__crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  align-items: center;
  font-size: .75rem;
  color: var(--ac-mute-2);
  margin-bottom: 1rem;
}
.ac-article__crumbs-label {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .2rem .55rem .2rem .45rem;
  margin-right: .25rem;
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ac-accent-dark);
  background: rgba(42,155,192,.08);
  border: 1px solid rgba(42,155,192,.2);
  border-radius: 999px;
}
.ac-article__crumbs-label svg { color: var(--ac-accent); }
.ac-article__crumbs-sep { color: rgba(0,0,0,.25); }
.ac-article__crumbs-current { color: #333; font-weight: 500; }
.ac-article__crumbs a { color: var(--ac-mute); text-decoration: none; }
.ac-article__crumbs a:hover { color: var(--ac-ink); }
.ac-article__cat {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .25rem .65rem;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ac-accent-dark);
  background: rgba(42,155,192,.08);
  border: 1px solid rgba(42,155,192,.2);
  border-radius: 999px;
}
.ac-article__title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -.025em;
  line-height: 1.1;
  color: var(--ac-ink);
  margin: 1rem 0 .75rem;
}
.ac-article__icon {
  display: inline-flex;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--ac-accent), var(--ac-accent-dark));
  color: #fff;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}
.ac-article__summary {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--ac-mute);
  max-width: 70ch;
}
.ac-aka {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
  margin-top: 1rem;
}
.ac-aka__label {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ac-mute-2);
  margin-right: .25rem;
}
.ac-aka__pill {
  padding: .2rem .55rem;
  background: #f0f0ee;
  border-radius: 6px;
  font-size: .78rem;
  color: #444;
}

/* ─── SECTIONS ─────────────────────────────────────────────── */
.ac-sec { margin: 2.25rem 0; scroll-margin-top: 90px; }
.ac-sec h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -.015em;
  color: var(--ac-ink);
  margin: 0 0 .75rem;
}
.ac-sec h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--ac-ink);
  margin: 1.5rem 0 .5rem;
}
.ac-sec p { margin: 0 0 1rem; }
.ac-sec ul, .ac-sec ol { margin: 0 0 1rem; padding-left: 1.5rem; }
.ac-sec li { margin: .25rem 0; }
.ac-sec code {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: .85em;
  background: #f4f4f2;
  padding: .1em .35em;
  border-radius: 4px;
  border: 1px solid var(--ac-line-soft);
}
.ac-sec blockquote {
  margin: 1.25rem 0;
  padding: .75rem 1rem;
  border-left: 3px solid var(--ac-accent);
  background: #f7fbfd;
  color: #333;
  font-style: italic;
  border-radius: 0 6px 6px 0;
}
.ac-callout {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: .75rem;
  margin: 1.25rem 0;
  padding: 1rem 1.1rem;
  background: #fff8eb;
  border: 1px solid #f0d99a;
  border-radius: 10px;
  font-size: .9375rem;
  color: #5a4400;
}
.ac-callout--info { background: #eef7fb; border-color: #b6dbe8; color: #134a5e; }
.ac-callout--danger { background: #fdeeee; border-color: #f1bdbd; color: #6f1a1a; }
.ac-callout svg { margin-top: 2px; }
.ac-kvtable {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.25rem;
  font-size: .9rem;
}
.ac-kvtable th, .ac-kvtable td {
  text-align: left;
  padding: .55rem .75rem;
  border-bottom: 1px solid var(--ac-line-soft);
  vertical-align: top;
}
.ac-kvtable th {
  font-size: .7rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ac-mute-2);
  background: var(--ac-bg-soft);
  font-weight: 700;
}

/* ─── PRODUCT PLACEMENT (Seqlense) ─────────────────────────── */
.ac-prod {
  margin: 2.25rem 0;
  padding: 1.5rem 1.5rem 1.25rem;
  background: linear-gradient(180deg, #0a0a0a, #161616);
  color: #f5f5f5;
  border-radius: var(--ac-radius);
  border: 1px solid #222;
}
.ac-prod__head { margin-bottom: 1rem; }
.ac-prod__tag {
  display: inline-block;
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ac-accent);
  margin-bottom: .5rem;
}
.ac-prod h3 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: #fff;
  margin: 0 0 .35rem;
}
.ac-prod p { color: #b3b3b3; font-size: .9375rem; margin: 0; line-height: 1.55; }
.ac-prod__list { display: grid; grid-template-columns: 1fr; gap: .625rem; margin-top: 1rem; }
@media (min-width: 720px) { .ac-prod__list { grid-template-columns: 1fr 1fr; } }
.ac-prod__item {
  display: block;
  position: relative;
  padding: .85rem 2.5rem .85rem 1rem;
  background: #181818;
  border: 1px solid #292929;
  border-radius: 10px;
  color: #f5f5f5;
  text-decoration: none;
  transition: background .15s, border-color .15s, transform .15s;
}
.ac-prod__item:hover { background: #1f1f1f; border-color: var(--ac-accent); transform: translateY(-1px); }
.ac-prod__name { font-weight: 700; font-size: .95rem; color: #fff; margin-bottom: .15rem; }
.ac-prod__why { font-size: .82rem; color: #a8a8a8; line-height: 1.45; }
.ac-prod__arrow {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ac-accent);
  font-size: 1.1rem;
}

/* ─── FRAUDCODEX BOX ───────────────────────────────────────── */
.ac-fcx {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 1rem;
  margin: 2rem 0;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, #fef6ef, #fdeada);
  border: 1px solid #f3c89a;
  border-radius: var(--ac-radius);
}
.ac-fcx__icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: #fff; display: flex; align-items: center; justify-content: center;
  color: #b45c10; border: 1px solid #f0c08a;
}
.ac-fcx__tag {
  font-size: .65rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  color: #b45c10; margin-bottom: .25rem;
}
.ac-fcx h3 { margin: 0 0 .4rem; font-size: 1.15rem; color: #4a2700; }
.ac-fcx p { margin: 0 0 .75rem; color: #6a3d10; font-size: .9375rem; line-height: 1.55; }
.ac-fcx__btn {
  display: inline-block;
  padding: .55rem 1rem;
  background: #b45c10;
  color: #fff;
  border-radius: 8px;
  font-size: .85rem;
  font-weight: 600;
  text-decoration: none;
  transition: background .15s;
}
.ac-fcx__btn:hover { background: #8d4709; }

/* ─── ON-THIS-PAGE TOC ─────────────────────────────────────── */
.ac-toc {
  position: sticky;
  top: 88px;
  font-size: .8125rem;
  padding: 1rem 1rem;
  border-left: 1px solid var(--ac-line);
}
.ac-toc h5 {
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ac-mute-2);
  margin: 0 0 .5rem;
}
.ac-toc ol { list-style: none; padding: 0; margin: 0; counter-reset: toc; }
.ac-toc li { counter-increment: toc; margin: .25rem 0; }
.ac-toc li::before {
  content: counter(toc, decimal-leading-zero) " ";
  color: var(--ac-mute-2);
  font-family: 'JetBrains Mono', monospace;
  font-size: .7rem;
  margin-right: .25rem;
}
.ac-toc a {
  color: #444;
  text-decoration: none;
  line-height: 1.4;
}
.ac-toc a:hover { color: var(--ac-accent-dark); }

/* ─── RELATED ──────────────────────────────────────────────── */
.ac-related { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--ac-line-soft); }
.ac-related h3 { font-size: 1.15rem; margin: 0 0 1rem; color: var(--ac-ink); }
.ac-related__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: .75rem;
}
.ac-related__item {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: .65rem;
  align-items: center;
  padding: .7rem .85rem;
  border: 1px solid var(--ac-line);
  border-radius: 10px;
  text-decoration: none;
  background: #fff;
  transition: border-color .15s, transform .15s;
}
.ac-related__item:hover { border-color: var(--ac-accent); transform: translateY(-1px); }
.ac-related__icon {
  width: 32px; height: 32px; border-radius: 8px;
  background: #f2f2f0; display: flex; align-items: center; justify-content: center;
  color: #444;
}
.ac-related__title { color: var(--ac-ink); font-weight: 600; font-size: .875rem; line-height: 1.3; }
.ac-related__cat { color: var(--ac-mute-2); font-size: .72rem; margin-top: 1px; }

/* ─── CARDS GRID (home / glossary index) ───────────────────── */
.ac-catblock { margin: 2.75rem 0; scroll-margin-top: 90px; }
.ac-catblock__h {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ac-ink);
  margin: 0 0 1rem;
  display: flex; align-items: baseline; gap: .65rem;
}
.ac-catblock__h::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--ac-line-soft);
}
.ac-catblock__grid, .ac-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: .9rem;
}
.ac-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.1rem 1.15rem 1.15rem;
  background: #fff;
  border: 1px solid var(--ac-line);
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.ac-card:hover {
  border-color: var(--ac-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,.05);
}
.ac-card__icon {
  width: 36px; height: 36px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--ac-accent), var(--ac-accent-dark));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: .25rem;
}
.ac-card__tag {
  font-size: .65rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--ac-mute-2);
}
.ac-card__title { font-size: 1.0625rem; font-weight: 700; color: var(--ac-ink); letter-spacing: -.01em; }
.ac-card__desc { font-size: .875rem; color: var(--ac-mute); line-height: 1.5; }
.ac-card__more { margin-top: .5rem; font-size: .8rem; font-weight: 600; color: var(--ac-accent-dark); }

/* ─── HOME (non-glossary content) ──────────────────────────── */
.ac-home {
  max-width: 1080px;
  margin: 0 auto;
  padding: 4rem 1.5rem 5rem;
}
.ac-home > section { margin-bottom: 4.5rem; }
.ac-home > section:last-child { margin-bottom: 0; }

.ac-home__intro h2,
.ac-home__strip h2,
.ac-home__cta h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--ac-ink);
  margin: 0 0 .9rem;
}
.ac-home__intro p {
  font-size: 1.05rem;
  line-height: 1.75;
  color: #3c3c3c;
  margin: 0 0 1rem;
  max-width: 75ch;
}
.ac-home__intro a { color: var(--ac-accent-dark); text-decoration: underline; text-underline-offset: 2px; }

.ac-home__pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.ac-home__pillar {
  padding: 1.4rem 1.4rem 1.5rem;
  background: #fff;
  border: 1px solid var(--ac-line);
  border-radius: var(--ac-radius);
  transition: border-color .15s, transform .15s;
}
.ac-home__pillar:hover { border-color: var(--ac-accent); transform: translateY(-2px); }
.ac-home__pillar-icon {
  display: inline-flex;
  width: 40px; height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--ac-accent), var(--ac-accent-dark));
  color: #fff;
  align-items: center; justify-content: center;
  margin-bottom: .9rem;
}
.ac-home__pillar h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ac-ink);
  margin: 0 0 .5rem;
}
.ac-home__pillar p {
  font-size: .9rem;
  line-height: 1.6;
  color: var(--ac-mute);
  margin: 0;
}
.ac-home__pillar a { color: var(--ac-accent-dark); text-decoration: underline; text-underline-offset: 2px; }

.ac-home__strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  padding: 2.25rem 2rem;
  background: var(--ac-bg-soft);
  border: 1px solid var(--ac-line);
  border-radius: var(--ac-radius);
}
@media (max-width: 760px) {
  .ac-home__strip { grid-template-columns: 1fr; gap: 1.5rem; padding: 1.5rem; }
}
.ac-home__strip p {
  font-size: .95rem;
  line-height: 1.7;
  color: #444;
  margin: 0;
}
.ac-home__strip a { color: var(--ac-accent-dark); text-decoration: underline; text-underline-offset: 2px; }
.ac-home__strip code {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: .82em;
  background: #fff;
  padding: .1em .4em;
  border-radius: 4px;
  border: 1px solid var(--ac-line);
}

.ac-home__cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 2rem 2.25rem;
  background: linear-gradient(135deg, #0a0a0a, #1a1a1a);
  color: #fff;
  border-radius: var(--ac-radius);
}
.ac-home__cta h2 { color: #fff; margin: 0 0 .35rem; }
.ac-home__cta p { color: #b3b3b3; margin: 0; font-size: .95rem; }

/* ─── HOME HERO ────────────────────────────────────────────── */
.ac-hero {
  padding: 4.5rem 1.5rem 3rem;
  text-align: center;
  background:
    radial-gradient(ellipse 60% 40% at 50% 0%, rgba(42,155,192,.06), transparent 70%),
    #f9f9f8;
  border-bottom: 1px solid var(--ac-line);
}
.ac-hero__inner { max-width: 820px; margin: 0 auto; }
.ac-hero__badge {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .35rem .85rem;
  background: #fff; border: 1px solid var(--ac-line);
  border-radius: 999px;
  font-size: .72rem; font-weight: 700; letter-spacing: .07em;
  text-transform: uppercase; color: #555; margin-bottom: 1.5rem;
}
.ac-hero__badge .pulse { width: 7px; height: 7px; border-radius: 50%; background: var(--ac-accent); }
.ac-hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1.07;
  color: var(--ac-ink);
  margin: 0 0 1rem;
}
.ac-hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--ac-accent), var(--ac-accent-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.ac-hero p {
  font-size: 1.0625rem;
  line-height: 1.65;
  color: #555;
  max-width: 620px;
  margin: 0 auto 1.75rem;
}
.ac-hero__ctas { display: flex; justify-content: center; gap: .75rem; flex-wrap: wrap; }
.ac-hero__stats {
  display: flex; justify-content: center; gap: 2rem; flex-wrap: wrap;
  margin-top: 2.5rem; padding-top: 2rem; border-top: 1px solid var(--ac-line-soft);
}
.ac-hero__stat strong {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ac-ink);
  letter-spacing: -.02em;
}
.ac-hero__stat span { font-size: .8rem; color: var(--ac-mute-2); letter-spacing: .04em; text-transform: uppercase; }

/* ─── 404 ──────────────────────────────────────────────────── */
.ac-404 {
  text-align: center; padding: 5rem 1rem; max-width: 600px; margin: 0 auto;
}
.ac-404__code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 5rem; font-weight: 700; color: var(--ac-accent);
  margin-bottom: 1rem;
}
.ac-404 h1 { font-size: 2rem; margin: 0 0 .75rem; color: var(--ac-ink); }
.ac-404 p { color: var(--ac-mute); margin: 0 0 1.5rem; }
.ac-404__actions { display: flex; justify-content: center; gap: .65rem; flex-wrap: wrap; }