/* ==========================================================================
   Knovaryn component classes — the site-facing implementation of the
   vocabulary documented in docs/design-system/components.md. Every rule
   consumes the tokens in tokens.css; nothing here hard-codes a color,
   size, or duration. All components work without JavaScript, from the
   keyboard, in light and dark scheme, and at 200% zoom.
   ========================================================================== */

/* ---- hero (§ components.md "Hero sections") ---------------------------- */
.kn-hero {
  padding: var(--kn-space-6) 0 var(--kn-space-5);
  max-width: var(--kn-prose-max);
}

.kn-hero--wide {
  max-width: none;
}

.kn-eyebrow {
  display: inline-block;
  font-size: var(--kn-text-caption);
  font-weight: 600;
  letter-spacing: var(--kn-tracking-overline);
  text-transform: uppercase;
  color: var(--kn-color-text-secondary);
  margin-bottom: var(--kn-space-2);
}

.kn-hero__title {
  font-size: var(--kn-text-display);
  line-height: var(--kn-leading-tight);
  font-weight: 700;
  color: var(--kn-color-text-primary);
  margin: 0 0 var(--kn-space-3);
}

.kn-hero__lead {
  font-size: var(--kn-text-body);
  line-height: var(--kn-leading-body);
  color: var(--kn-color-text-secondary);
  margin: 0 0 var(--kn-space-4);
}

@media (min-width: 640px) {
  .kn-hero {
    padding: var(--kn-space-7) 0 var(--kn-space-5);
  }
  .kn-hero__title {
    font-size: var(--kn-text-display-lg);
  }
}

/* ---- actions (§ "Primary and secondary actions") ------------------------ */
.kn-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--kn-space-2);
  align-items: center;
  margin: 0 0 var(--kn-space-4);
}

.kn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 0 var(--kn-space-3);
  border-radius: var(--kn-radius-sm);
  border: var(--kn-border-width-strong) solid var(--kn-color-border-strong);
  font-weight: 600;
  font-size: var(--kn-text-body);
  text-decoration: none;
  transition: background-color var(--kn-dur-fast) var(--kn-ease-out-soft),
    border-color var(--kn-dur-fast) var(--kn-ease-out-soft);
}

.kn-btn--primary {
  background: var(--kn-color-brand-primary);
  border-color: var(--kn-color-brand-primary);
  color: var(--kn-color-surface);
}

.kn-btn--primary:hover {
  background: var(--kn-color-link);
  border-color: var(--kn-color-link);
  color: var(--kn-color-surface);
}

.kn-btn--secondary {
  background: transparent;
  color: var(--kn-color-text-primary);
}

.kn-btn--secondary:hover {
  border-color: var(--kn-color-brand-primary);
  color: var(--kn-color-brand-primary);
}

.kn-btn:focus-visible {
  outline: none;
  box-shadow: var(--kn-focus-ring);
}

/* ---- feature cards (§ "Feature cards") ----------------------------------- */
.kn-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: var(--kn-space-3);
  margin: var(--kn-space-4) 0;
}

.kn-card {
  display: flex;
  flex-direction: column;
  gap: var(--kn-space-2);
  background: var(--kn-color-surface-elevated);
  border: var(--kn-border-width) solid var(--kn-color-border);
  border-radius: var(--kn-radius-md);
  box-shadow: var(--kn-shadow-card);
  padding: var(--kn-space-3);
}

.kn-card__title {
  font-size: var(--kn-text-heading);
  font-weight: 600;
  color: var(--kn-color-text-primary);
  margin: 0;
}

.kn-card__body {
  font-size: var(--kn-text-secondary-size);
  line-height: var(--kn-leading-snug);
  color: var(--kn-color-text-secondary);
  margin: 0;
}

.kn-card__scope {
  font-size: var(--kn-text-caption);
  color: var(--kn-color-text-secondary);
  border-top: var(--kn-border-width) solid var(--kn-color-border);
  padding-top: var(--kn-space-2);
  margin-top: auto;
}

.kn-card__scope strong {
  color: var(--kn-color-text-primary);
}

/* ---- maturity pills (§ "Maturity labels") -------------------------------- */
.kn-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.15em 0.8em;
  border-radius: var(--kn-radius-pill);
  border: var(--kn-border-width) solid var(--kn-color-border-strong);
  font-size: var(--kn-text-caption);
  font-weight: 600;
  letter-spacing: var(--kn-tracking-overline);
  text-transform: uppercase;
  color: var(--kn-color-text-secondary);
  vertical-align: middle;
}

.kn-pill::before {
  content: "";
  width: 0.55em;
  height: 0.55em;
  border-radius: 50%;
  background: var(--kn-color-text-disabled);
}

.kn-pill--stable {
  color: var(--kn-color-success);
  border-color: var(--kn-color-success);
}

.kn-pill--stable::before {
  background: var(--kn-color-success);
}

.kn-pill--alpha {
  color: var(--kn-color-warning);
  border-color: var(--kn-color-warning);
}

.kn-pill--alpha::before {
  background: var(--kn-color-warning);
}

/* ---- version/maturity banner (overrides/main.html announce block) -------- */
.kn-banner-version {
  display: inline-block;
  padding: 0.1em 0.6em;
  border: 1px solid var(--kn-color-warning);
  border-radius: 999px;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

/* ---- links in running text (Lighthouse link-in-text-block, WCAG 1.4.1) ---
   The Trace link color differs from body Ink by ~2.3:1, so color alone is
   not a sufficient cue: underline links in prose. Boxed components (buttons,
   task cards) already carry a border — a non-color cue — and stay clean. */
.md-typeset a,
.md-banner a {
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.md-typeset .kn-btn,
.md-typeset .kn-tasks a,
.md-typeset .kn-pill,
.md-typeset .kn-state,
.md-typeset a.headerlink,
.md-typeset .kn-figure > a {
  text-decoration: none;
}

/* ---- tabs — radio-driven, arrow-key navigable, no JS --------------------- */
.kn-tabs {
  position: relative;
  margin: var(--kn-space-4) 0;
}

.kn-tabs > input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  /* stays keyboard-focusable; the ring lands on its label below */
}

.kn-tabs > label {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--kn-space-3);
  margin: 0;
  font-size: var(--kn-text-secondary-size);
  font-weight: 600;
  color: var(--kn-color-text-secondary);
  border: var(--kn-border-width) solid transparent;
  border-bottom: var(--kn-border-width-strong) solid var(--kn-color-border);
  cursor: pointer;
  transition: color var(--kn-dur-fast) var(--kn-ease-out-soft),
    border-color var(--kn-dur-fast) var(--kn-ease-out-soft);
}

.kn-tabs > label:hover {
  color: var(--kn-color-brand-primary);
}

.kn-tabs > input:checked + label {
  color: var(--kn-color-brand-primary);
  border-bottom-color: var(--kn-color-brand-primary);
}

.kn-tabs > input:focus-visible + label {
  outline: none;
  box-shadow: var(--kn-focus-ring);
  border-radius: var(--kn-radius-sm);
}

.kn-tabpanels {
  border: var(--kn-border-width) solid var(--kn-color-border);
  border-radius: var(--kn-radius-md);
  background: var(--kn-color-surface-elevated);
  padding: var(--kn-space-4);
  margin-top: -1px;
}

.kn-tabpanels > .kn-panel {
  display: none;
}

/* generic index pairing: Nth radio selects Nth panel */
.kn-tabs > input:nth-of-type(1):checked ~ .kn-tabpanels > .kn-panel:nth-child(1),
.kn-tabs > input:nth-of-type(2):checked ~ .kn-tabpanels > .kn-panel:nth-child(2),
.kn-tabs > input:nth-of-type(3):checked ~ .kn-tabpanels > .kn-panel:nth-child(3),
.kn-tabs > input:nth-of-type(4):checked ~ .kn-tabpanels > .kn-panel:nth-child(4),
.kn-tabs > input:nth-of-type(5):checked ~ .kn-tabpanels > .kn-panel:nth-child(5),
.kn-tabs > input:nth-of-type(6):checked ~ .kn-tabpanels > .kn-panel:nth-child(6),
.kn-tabs > input:nth-of-type(7):checked ~ .kn-tabpanels > .kn-panel:nth-child(7),
.kn-tabs > input:nth-of-type(8):checked ~ .kn-tabpanels > .kn-panel:nth-child(8),
.kn-tabs > input:nth-of-type(9):checked ~ .kn-tabpanels > .kn-panel:nth-child(9),
.kn-tabs > input:nth-of-type(10):checked ~ .kn-tabpanels > .kn-panel:nth-child(10),
.kn-tabs > input:nth-of-type(11):checked ~ .kn-tabpanels > .kn-panel:nth-child(11),
.kn-tabs > input:nth-of-type(12):checked ~ .kn-tabpanels > .kn-panel:nth-child(12) {
  display: block;
}

/* ---- accordions (details/summary) ---------------------------------------- */
.kn-details {
  background: var(--kn-color-surface-elevated);
  border: var(--kn-border-width) solid var(--kn-color-border);
  border-radius: var(--kn-radius-md);
  padding: 0 var(--kn-space-3);
  margin: var(--kn-space-2) 0;
}

.kn-details > summary {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-weight: 600;
  color: var(--kn-color-text-primary);
  cursor: pointer;
}

.kn-details > summary:focus-visible {
  outline: none;
  box-shadow: var(--kn-focus-ring);
  border-radius: var(--kn-radius-sm);
}

.kn-details[open] > summary {
  border-bottom: var(--kn-border-width) solid var(--kn-color-border);
  margin-bottom: var(--kn-space-2);
}

/* ---- architecture panels (§ "Architecture panels") ----------------------- */
.kn-diagram {
  border: var(--kn-border-width-strong) solid var(--kn-color-border-strong);
  border-radius: var(--kn-radius-md);
  background: var(--kn-color-surface-sunken);
  padding: var(--kn-space-3);
  margin: var(--kn-space-3) 0;
}

.kn-diagram .mermaid {
  display: flex;
  justify-content: center;
  background: transparent;
}

.kn-diagram__caption {
  font-size: var(--kn-text-secondary-size);
  color: var(--kn-color-text-secondary);
  margin: var(--kn-space-2) 0 0;
}

/* ---- trust / evidence cards (§ "Trust/evidence cards") ------------------- */
.kn-evidence {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: var(--kn-space-3);
  margin: var(--kn-space-4) 0;
}

/* ---- metric cards (§ "Metric cards") -------------------------------------- */
.kn-metric {
  background: var(--kn-color-surface-elevated);
  border: var(--kn-border-width) solid var(--kn-color-border);
  border-radius: var(--kn-radius-md);
  box-shadow: var(--kn-shadow-card);
  padding: var(--kn-space-3);
}

.kn-metric__value {
  font-size: var(--kn-text-title);
  font-weight: 700;
  color: var(--kn-color-text-primary);
  line-height: var(--kn-leading-tight);
}

.kn-metric__label {
  font-size: var(--kn-text-secondary-size);
  color: var(--kn-color-text-secondary);
  margin: var(--kn-space-1) 0;
}

.kn-metric__source {
  font-size: var(--kn-text-caption);
}

/* ---- quality-gate states (§ "Quality-gate states") ------------------------ */
.kn-state {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  padding: 0.15em 0.7em;
  border-radius: var(--kn-radius-sm);
  font-size: var(--kn-text-secondary-size);
  font-weight: 600;
  border: var(--kn-border-width) solid var(--kn-color-border-strong);
  color: var(--kn-color-text-secondary);
}

.kn-state::before {
  content: "";
  width: 0.6em;
  height: 0.6em;
  border-radius: 50%;
  background: var(--kn-color-text-disabled);
}

.kn-state--accepted {
  color: var(--kn-color-success);
  border-color: var(--kn-color-success);
}

.kn-state--accepted::before {
  background: var(--kn-color-success);
}

.kn-state--review {
  color: var(--kn-color-warning);
  border-color: var(--kn-color-warning);
}

.kn-state--review::before {
  background: var(--kn-color-warning);
  border-radius: 15%;
  transform: rotate(45deg); /* diamond */
}

.kn-state--quarantined {
  color: var(--kn-color-warning);
  border-style: dashed;
}

.kn-state--quarantined::before {
  background: transparent;
  border: 2px solid var(--kn-color-warning);
  border-radius: 2px;
}

.kn-state--rejected {
  color: var(--kn-color-error);
  border-color: var(--kn-color-error);
}

.kn-state--rejected::before {
  background: var(--kn-color-error);
  border-radius: 1px;
  transform: rotate(45deg) scale(0.9);
}

.kn-state code {
  font-size: var(--kn-text-caption);
  color: inherit;
  background: transparent;
  padding: 0;
  border: 0;
}

/* ---- provenance nodes (§ "Provenance nodes") ------------------------------- */
.kn-lineage {
  display: flex;
  flex-direction: column;
  gap: var(--kn-space-2);
  border-left: var(--kn-border-width-strong) solid var(--kn-color-border-strong);
  padding-left: var(--kn-space-3);
  margin: var(--kn-space-3) 0;
}

.kn-lineage__node {
  background: var(--kn-color-surface-elevated);
  border: var(--kn-border-width) solid var(--kn-color-border);
  border-radius: var(--kn-radius-sm);
  padding: var(--kn-space-2) var(--kn-space-3);
}

.kn-lineage__node strong {
  color: var(--kn-color-text-primary);
}

.kn-lineage__meta {
  font-size: var(--kn-text-secondary-size);
  color: var(--kn-color-text-secondary);
}

/* ---- figures / screenshots (§ "Screenshots and captions") ------------------ */
.kn-figure {
  margin: var(--kn-space-4) 0;
  border: var(--kn-border-width) solid var(--kn-color-border);
  border-radius: var(--kn-radius-md);
  background: var(--kn-color-surface-elevated);
  padding: var(--kn-space-2);
  max-width: 100%;
}

.kn-figure img {
  border-radius: var(--kn-radius-sm);
  max-width: 100%;
  height: auto;
}

.kn-figure figcaption {
  font-size: var(--kn-text-secondary-size);
  color: var(--kn-color-text-secondary);
  padding: var(--kn-space-2) var(--kn-space-1) var(--kn-space-1);
}

/* ---- pipeline stage list (landing "How it works") -------------------------- */
.kn-pipeline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--kn-space-1) var(--kn-space-2);
  margin: var(--kn-space-3) 0;
}

.kn-pipeline__stage {
  display: inline-flex;
  align-items: center;
  font-size: var(--kn-text-secondary-size);
  font-weight: 600;
  color: var(--kn-color-text-primary);
  background: var(--kn-color-surface-elevated);
  border: var(--kn-border-width) solid var(--kn-color-border);
  border-radius: var(--kn-radius-sm);
  padding: 0.3em 0.8em;
}

.kn-pipeline__arrow {
  color: var(--kn-color-brand-primary);
  font-weight: 700;
}

/* ---- task links (§11.11 task-oriented entry points) ------------------------ */
.kn-tasks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: var(--kn-space-2);
  margin: var(--kn-space-3) 0;
  padding: 0;
  list-style: none;
}

.kn-tasks a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: var(--kn-space-1) var(--kn-space-2);
  border: var(--kn-border-width) solid var(--kn-color-border);
  border-radius: var(--kn-radius-sm);
  color: var(--kn-color-text-primary);
  font-weight: 600;
  font-size: var(--kn-text-secondary-size);
  text-decoration: none;
}

.kn-tasks a:hover {
  border-color: var(--kn-color-brand-primary);
  color: var(--kn-color-brand-primary);
}

.kn-tasks a:focus-visible {
  outline: none;
  box-shadow: var(--kn-focus-ring);
}

/* ---- comparison table restraint (§11.10) ------------------------------------ */
.kn-table-wrap {
  overflow-x: auto;
}

.kn-table-wrap table {
  margin-bottom: 0;
}