/* ==========================================================================
   Components — site chrome, cards, callouts, buttons, code blocks.
   ========================================================================== */

/* ----- Site header ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background-color: color-mix(in srgb, var(--surface-base) 88%, transparent);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-base) var(--ease-out),
              background-color var(--t-base) var(--ease-out);
}
.site-header.is-scrolled {
  border-bottom-color: var(--border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: var(--s-5);
}
.site-header__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6ch;
  text-decoration: none;
  color: var(--ink-primary);
  font-family: var(--font-sans);
  letter-spacing: -0.02em;
  font-size: 1.0625rem;
}
.site-header__brand-mark {
  font-weight: var(--weight-bold);
  font-feature-settings: "ss01";
}
.site-header__brand-mark-light {
  font-weight: var(--weight-regular);
  color: var(--ink-secondary);
}

.primary-nav {
  display: none;
}
.primary-nav__list {
  display: flex;
  gap: var(--s-5);
  list-style: none;
  margin: 0;
  padding: 0;
}
.primary-nav__link {
  position: relative;
  display: inline-block;
  padding: var(--s-2) 0;
  font-size: 0.9375rem;
  font-weight: var(--weight-medium);
  text-decoration: none;
  color: var(--ink-secondary);
  letter-spacing: -0.005em;
  transition: color var(--t-fast) var(--ease-out);
}
.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.5rem;
  height: 1px;
  background-color: var(--ink-primary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-base) var(--ease-out);
}
.primary-nav__link:hover,
.primary-nav__link[aria-current="page"] {
  color: var(--ink-primary);
}
.primary-nav__link:hover::after,
.primary-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-header__cta {
  display: none;
}

/* Mobile nav toggle */
.nav-toggle {
  appearance: none;
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--ink-primary);
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  border-radius: var(--radius-1);
  transition: border-color var(--t-fast) var(--ease-out);
}
.nav-toggle:hover { border-color: var(--ink-primary); }
.nav-toggle__icon {
  position: relative;
  width: 16px;
  height: 12px;
  display: block;
}
.nav-toggle__icon::before,
.nav-toggle__icon::after,
.nav-toggle__icon span {
  content: "";
  position: absolute;
  left: 0;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--t-base) var(--ease-out),
              opacity var(--t-fast) var(--ease-out),
              top var(--t-base) var(--ease-out);
}
.nav-toggle__icon::before { top: 0; width: 100%; }
.nav-toggle__icon span    { top: 5px; width: 100%; }
.nav-toggle__icon::after  { top: 10px; width: 100%; }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before {
  top: 5px;
  transform: rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after {
  top: 5px;
  transform: rotate(-45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span { opacity: 0; }

/* Mobile drawer.
   Rendered as a sibling of <header> (not a child) so the header's
   backdrop-filter does not establish a containing block that would clip
   this fixed element. Drawer z-index sits *below* the sticky header so
   the close (X) button on the header stays clickable. */
.mobile-nav {
  position: fixed;
  top: var(--header-h);
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: calc(100dvh - var(--header-h));
  background: var(--surface-base);
  z-index: calc(var(--z-nav) - 1);
  padding: var(--s-5) var(--gutter) var(--s-7);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  transform: translateY(-1%);
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  transition: opacity var(--t-base) var(--ease-out),
              transform var(--t-base) var(--ease-out),
              visibility 0s linear var(--t-base);
}
.mobile-nav[aria-hidden="false"] {
  opacity: 1;
  transform: none;
  pointer-events: auto;
  visibility: visible;
  transition: opacity var(--t-base) var(--ease-out),
              transform var(--t-base) var(--ease-out),
              visibility 0s linear 0s;
}
.mobile-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.mobile-nav__link {
  display: block;
  padding: var(--s-4) 0;
  font-size: 1.5rem;
  font-weight: var(--weight-semibold);
  text-decoration: none;
  color: var(--ink-primary);
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.018em;
  background: var(--surface-base);
}
.mobile-nav__link[aria-current="page"] {
  color: var(--ink-primary);
}
.mobile-nav__link[aria-current="page"]::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-primary);
  margin-right: 0.6rem;
  vertical-align: middle;
  transform: translateY(-2px);
}

@media (min-width: 1024px) {
  .primary-nav { display: block; }
  .nav-toggle { display: none; }
  .mobile-nav { display: none; }
  .site-header__cta { display: inline-flex; }
}

/* ----- Footer ----- */
.site-footer {
  margin-top: 0;
  padding-block: var(--s-8) var(--s-6);
  background: var(--surface-elevated);
  border-top: 1px solid var(--border);
  font-family: var(--font-sans);
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-6);
}
@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1.6fr 1fr 1fr 1fr;
  }
}
.site-footer__col h4 {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  color: var(--ink-muted);
  margin-bottom: var(--s-3);
}
.site-footer__col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}
.site-footer__col a {
  text-decoration: none;
  color: var(--ink-secondary);
  font-size: 0.9375rem;
  transition: color var(--t-fast) var(--ease-out);
}
.site-footer__col a:hover { color: var(--ink-primary); }
.site-footer__brand {
  font-size: 1.5rem;
  font-weight: var(--weight-bold);
  letter-spacing: -0.02em;
  margin-bottom: var(--s-2);
}
.site-footer__tagline {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  color: var(--ink-secondary);
  max-width: 36ch;
}
.site-footer__bottom {
  margin-top: var(--s-7);
  padding-top: var(--s-4);
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--s-3);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--ink-muted);
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  padding: 0.875rem 1.375rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: var(--weight-medium);
  letter-spacing: -0.005em;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid var(--ink-primary);
  border-radius: var(--radius-1);
  background: var(--ink-primary);
  color: var(--surface-base);
  transition: background var(--t-fast) var(--ease-out),
              color var(--t-fast) var(--ease-out),
              border-color var(--t-fast) var(--ease-out),
              transform var(--t-fast) var(--ease-out);
}
.btn:hover {
  background: transparent;
  color: var(--ink-primary);
}
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.btn:active { transform: translateY(1px); }
.btn--ghost {
  background: transparent;
  color: var(--ink-primary);
}
.btn--ghost:hover {
  background: var(--ink-primary);
  color: var(--surface-base);
}
.btn--inverse {
  background: var(--surface-base);
  color: var(--ink-primary);
  border-color: var(--surface-base);
}
.btn--inverse:hover {
  background: transparent;
  color: var(--surface-base);
  border-color: var(--surface-base);
}
.btn--lg {
  padding: 1.125rem 1.75rem;
  font-size: 1rem;
}
.btn__arrow {
  font-family: var(--font-mono);
  display: inline-block;
  transition: transform var(--t-fast) var(--ease-out);
}
.btn:hover .btn__arrow { transform: translateX(4px); }

/* ----- Cards ----- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface-base);
  border: 1px solid var(--border);
  border-radius: var(--radius-2);
  padding: var(--s-5);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--t-base) var(--ease-out),
              transform var(--t-base) var(--ease-out),
              box-shadow var(--t-base) var(--ease-out);
  overflow: hidden;
}
.card:hover {
  border-color: var(--ink-primary);
  box-shadow: var(--shadow-2);
}
.card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--ink-primary);
}
.card__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  color: var(--ink-muted);
  margin-bottom: var(--s-3);
}
.card__title {
  font-size: 1.375rem;
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-heading);
  margin: 0 0 var(--s-3);
  color: var(--ink-primary);
  text-wrap: balance;
}
.card__body {
  font-size: 0.9375rem;
  color: var(--ink-secondary);
  line-height: var(--lh-body);
  margin: 0 0 var(--s-4);
  flex-grow: 1;
}
.card__cta {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--ink-primary);
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  margin-top: auto;
}
.card__cta-arrow {
  display: inline-block;
  transition: transform var(--t-base) var(--ease-out);
}
.card:hover .card__cta-arrow { transform: translateX(6px); }
.card::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: var(--ink-primary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-base) var(--ease-out);
}
.card:hover::after { transform: scaleX(1); }

/* ----- Pills / type tags ----- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: var(--s-1);
  padding: 0.25rem 0.625rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  color: var(--ink-secondary);
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-1);
  white-space: nowrap;
}
.pill--solid {
  background: var(--ink-primary);
  color: var(--surface-base);
  border-color: var(--ink-primary);
}
.pill--accent {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

/* ----- Callouts ----- */
.callout {
  border: 1px solid var(--border);
  border-left: 2px solid var(--ink-primary);
  background: var(--surface-elevated);
  padding: var(--s-5);
  margin: var(--s-6) 0;
}
.callout__label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  color: var(--ink-muted);
  margin-bottom: var(--s-2);
  display: block;
}
.callout__title {
  font-size: 1.125rem;
  font-weight: var(--weight-semibold);
  margin: 0 0 var(--s-3);
  color: var(--ink-primary);
}
.callout--inverse {
  background: var(--surface-inverse);
  color: var(--ink-on-inverse);
  border-color: var(--surface-inverse);
  border-left-color: var(--surface-inverse);
}
.callout--inverse .callout__title { color: var(--ink-on-inverse); }
.callout--inverse .callout__label { color: var(--ink-on-inverse-muted); }

/* ----- Terminal-aesthetic block (stack traces, out-of-scope lists)
   Uses elevated surface — not --surface-inverse, which flips to a light band
   in dark mode and breaks the “console on the page” read. ----- */
.terminal {
  background: var(--surface-elevated);
  color: var(--ink-primary);
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  line-height: 1.65;
  padding: var(--s-5);
  border-radius: var(--radius-1);
  border: 1px solid var(--border);
}
.terminal > p { margin: 0; }
.terminal__prompt {
  color: var(--ink-muted);
  user-select: none;
}
.terminal__line {
  display: block;
  white-space: pre-wrap;
}
.terminal__comment { color: var(--ink-muted); }
.terminal__keyword {
  color: var(--accent);
  font-weight: var(--weight-medium);
}

/* ----- Eyebrow strip ----- */
.eyebrow-strip {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3) var(--s-5);
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  color: var(--ink-muted);
}
.eyebrow-strip__item {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
}
.eyebrow-strip__item::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--ink-primary);
  display: inline-block;
}

/* ----- Status indicator (pulsing dot) ----- */
.status-dot {
  position: relative;
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--signal-pass);
}
.status-dot::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--signal-pass);
  animation: status-pulse 2.4s var(--ease-out) infinite;
}
@keyframes status-pulse {
  0%   { transform: scale(1);   opacity: 0.6; }
  100% { transform: scale(3.5); opacity: 0;   }
}
@media (prefers-reduced-motion: reduce) {
  .status-dot::after { animation: none; }
}

/* ----- Code blocks (Pygments-themed monochrome).
   Code blocks read as terminals in both schemes, so pin a fixed dark surface
   instead of --surface-inverse (which now resolves to a light slate in dark
   mode and would render the hard-coded light syntax colors invisible). ----- */
.codehilite {
  background: #0A0C0E;
  color: #F0F2F5;
  border-radius: var(--radius-1);
  padding: var(--s-4);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  line-height: 1.6;
}
.codehilite pre { margin: 0; }
.codehilite .c, .codehilite .c1, .codehilite .cm, .codehilite .cs { color: rgba(240, 242, 245, 0.45); font-style: italic; } /* comments */
.codehilite .k, .codehilite .kd, .codehilite .kn, .codehilite .kr { color: #B5C7D8; font-weight: 500; } /* keywords */
.codehilite .s, .codehilite .s1, .codehilite .s2, .codehilite .sr { color: #E8E0C8; } /* strings */
.codehilite .nb, .codehilite .nf, .codehilite .nc { color: #F0F2F5; }
.codehilite .o, .codehilite .p { color: rgba(240, 242, 245, 0.7); }
.codehilite .mi, .codehilite .mf { color: #C8D4DD; }

/* ----- Anchor link affordance for headings inside .prose ----- */
.prose .toclink {
  color: inherit;
  text-decoration: none;
}

/* ----- Generic table container scroll on mobile ----- */
.table-scroll {
  overflow-x: auto;
  margin: var(--s-5) 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-1);
}
.table-scroll table { margin: 0; }