/* ==========================================================================
   Haql Labs — engine documentation
   A small, plain-CSS layer on top of the site design system.
   ========================================================================== */

.doc-hero {
  padding: clamp(3.5rem, 7vw, 6rem) 0 clamp(2.5rem, 5vw, 4rem);
  border-top: 1px solid var(--line);
  background:
    radial-gradient(ellipse at 20% 0%, var(--accent-soft), transparent 55%),
    var(--bg);
}
.doc-hero h1 {
  max-width: 16ch;
  font-size: var(--fs-3xl);
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin-bottom: 1.2rem;
}
.doc-hero h1 em {
  color: var(--accent);
  font-style: normal;
}
.doc-hero .lede {
  max-width: 68ch;
  margin-bottom: 1.5rem;
}
.doc-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1.4rem;
}
.doc-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: 1px solid var(--line-2);
  padding: 0.35rem 0.55rem;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.doc-badge--ok {
  border-color: var(--ok);
  color: var(--ok);
}
.doc-badge--accent {
  border-color: var(--accent-line);
  color: var(--accent);
}

.doc-layout {
  display: grid;
  grid-template-columns: minmax(190px, 245px) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: start;
  padding: clamp(2rem, 4vw, 3.5rem) 0;
}
.doc-side {
  position: sticky;
  top: 82px;
  border-left: 1px solid var(--line);
  padding-left: 1rem;
}
.doc-side__label {
  display: block;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 0.8rem;
}
.doc-side a {
  display: block;
  padding: 0.35rem 0;
  color: var(--ink-2);
  font-size: 0.9rem;
  text-decoration: none;
  line-height: 1.35;
}
.doc-side a:hover,
.doc-side a[aria-current="page"] {
  color: var(--accent);
}
.doc-side a[aria-current="page"] {
  font-weight: 600;
}
.doc-side hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1rem 0;
}

.doc-main {
  min-width: 0;
  max-width: 860px;
}
.doc-main section {
  padding: 0 0 clamp(2.2rem, 4vw, 3.5rem);
  margin-bottom: clamp(2.2rem, 4vw, 3.5rem);
  border-bottom: 1px solid var(--line);
}
.doc-main section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
}
.doc-main h2 {
  font-size: var(--fs-xl);
  line-height: 1.15;
  margin-bottom: 0.9rem;
  max-width: 24ch;
}
.doc-main h3 {
  font-size: var(--fs-md);
  margin: 1.6rem 0 0.6rem;
}
.doc-main p,
.doc-main li {
  color: var(--ink-2);
  line-height: 1.65;
}
.doc-main p {
  max-width: 72ch;
  margin-bottom: 0.9rem;
}
.doc-main ul,
.doc-main ol {
  margin: 0.5rem 0 1rem 1.25rem;
}
.doc-main li {
  margin: 0.35rem 0;
}
.doc-main a {
  color: var(--accent);
}
.doc-main code {
  font-family: var(--mono);
  font-size: 0.86em;
  color: var(--ink);
  background: var(--surface-2);
  padding: 0.12em 0.35em;
  border: 1px solid var(--line);
}
.doc-main pre {
  background: var(--bg-2);
  border: 1px solid var(--line);
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0 1.2rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--ink);
}
.doc-main pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: inherit;
}

.doc-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 1.2rem 0 1.5rem;
}
.doc-card {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 1rem;
}
.doc-card h3 {
  margin: 0 0 0.45rem;
  font-size: 0.95rem;
}
.doc-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.55;
}
.doc-card .doc-card__tag {
  display: block;
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.doc-callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 0.9rem 1rem;
  margin: 1.2rem 0;
}
.doc-callout p {
  margin: 0;
  color: var(--ink);
}
.doc-callout--warn {
  border-left-color: var(--high);
  background: var(--high-soft);
}
.doc-callout--ok {
  border-left-color: var(--ok);
  background: var(--ok-soft);
}
.doc-callout strong {
  color: var(--ink);
}

.doc-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.4rem;
  font-size: 0.88rem;
}
.doc-table th,
.doc-table td {
  text-align: left;
  vertical-align: top;
  padding: 0.6rem 0.7rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink-2);
}
.doc-table th {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-bottom-color: var(--line-2);
}
.doc-table td:first-child {
  color: var(--ink);
  font-weight: 600;
}
.doc-table code {
  font-size: 0.84em;
}

.doc-steps {
  counter-reset: docstep;
  list-style: none;
  margin-left: 0;
}
.doc-steps > li {
  counter-increment: docstep;
  position: relative;
  padding-left: 2.2rem;
  margin: 0.9rem 0;
}
.doc-steps > li::before {
  content: counter(docstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.05rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
}

.doc-pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  margin-top: 2.4rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.doc-pager a {
  color: var(--accent);
  text-decoration: none;
}
.doc-pager span {
  color: var(--ink-3);
}

.doc-meta {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--ink-3);
  margin-bottom: 1.2rem;
}

@media (max-width: 860px) {
  .doc-layout {
    grid-template-columns: 1fr;
  }
  .doc-side {
    position: static;
    border-left: 0;
    border-bottom: 1px solid var(--line);
    padding: 0 0 1rem;
  }
  .doc-side a {
    display: inline-block;
    margin-right: 1rem;
  }
  .doc-grid {
    grid-template-columns: 1fr;
  }
  .doc-hero h1 {
    max-width: 20ch;
  }
  .doc-table {
    display: block;
    overflow-x: auto;
  }
}

/* ---------- public guide components ---------- */
.doc-audience {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 1.2rem 0 1.5rem;
}
.doc-audience__item {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 1rem;
}
.doc-audience__item span {
  display: block;
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.45rem;
}
.doc-audience__item h3 {
  margin: 0 0 0.4rem;
  font-size: 0.95rem;
}
.doc-audience__item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.55;
}

.doc-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 1.3rem 0 1.6rem;
}
.doc-flow__step {
  position: relative;
  border-top: 2px solid var(--accent);
  padding-top: 0.7rem;
}
.doc-flow__step span {
  display: block;
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 0.35rem;
}
.doc-flow__step strong {
  display: block;
  color: var(--ink);
  font-size: 0.92rem;
  line-height: 1.3;
  margin-bottom: 0.35rem;
}
.doc-flow__step p {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.5;
}
.doc-flow__step:not(:last-child)::after {
  content: "→";
  position: absolute;
  top: 0.45rem;
  right: -0.58rem;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.8rem;
}

.doc-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin: 1.2rem 0 1.5rem;
}
.doc-compare__item {
  border: 1px solid var(--line);
  padding: 1rem;
  background: var(--surface);
}
.doc-compare__item span {
  display: block;
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.4rem;
}
.doc-compare__item strong {
  display: block;
  color: var(--ink);
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}
.doc-compare__item p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.5;
}
.doc-compare__item--accent {
  border-color: var(--accent-line);
  background: var(--accent-soft);
}

.doc-stat-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 1.2rem 0 1.5rem;
}
.doc-stat {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 1rem;
}
.doc-stat strong {
  display: block;
  color: var(--accent);
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-size: 1.55rem;
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}
.doc-stat span {
  display: block;
  color: var(--ink);
  font-size: 0.86rem;
  line-height: 1.4;
  margin-bottom: 0.3rem;
}
.doc-stat p {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.45;
}

.doc-faq {
  margin: 1.2rem 0 0;
}
.doc-faq details {
  border-bottom: 1px solid var(--line);
}
.doc-faq details:first-child {
  border-top: 1px solid var(--line);
}
.doc-faq summary {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.85rem 0;
  cursor: pointer;
  color: var(--ink);
  font-weight: 600;
  line-height: 1.4;
  list-style: none;
}
.doc-faq summary::-webkit-details-marker {
  display: none;
}
.doc-faq summary::before {
  content: "+";
  flex: 0 0 auto;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.9rem;
}
.doc-faq details[open] summary::before {
  content: "−";
}
.doc-faq details p {
  margin: 0 0 1rem 1.6rem;
  font-size: 0.9rem;
  line-height: 1.65;
}

.doc-main .doc-kicker {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 0.5rem;
}

.doc-main .doc-quote {
  border-left: 3px solid var(--line-2);
  padding-left: 1rem;
  margin: 1.3rem 0;
  color: var(--ink);
  font-size: 1.05rem;
  line-height: 1.6;
}

.doc-main .doc-operator {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 1rem;
  margin: 1.2rem 0;
}
.doc-main .doc-operator h3 {
  margin-top: 0;
}
.doc-main .doc-operator p:last-child {
  margin-bottom: 0;
}

@media (max-width: 860px) {
  .doc-audience,
  .doc-stat-grid,
  .doc-flow {
    grid-template-columns: 1fr;
  }
  .doc-flow__step:not(:last-child)::after {
    content: "↓";
    top: auto;
    bottom: -0.75rem;
    right: 0;
  }
  .doc-compare {
    grid-template-columns: 1fr;
  }
  .doc-flow__step {
    padding-bottom: 0.5rem;
  }
}

/* ---------- documentation hub ---------- */
.doc-product-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 1.2rem 0 1.6rem;
}
.doc-card--link {
  display: block;
  color: inherit;
  text-decoration: none;
  transition: border-color 120ms ease, transform 120ms ease;
}
.doc-card--link:hover {
  border-color: var(--accent-line);
  transform: translateY(-1px);
}
.doc-card--link .doc-card__more {
  display: inline-block;
  margin-top: 0.7rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.doc-hub-note {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 1rem;
  margin: 1.2rem 0;
}
.doc-hub-note p:last-child {
  margin-bottom: 0;
}

@media (max-width: 860px) {
  .doc-product-grid {
    grid-template-columns: 1fr;
  }
}