/* ==========================================================================
   components.css — component layer for CSR design system
   Consumes: tokens.css, base.css
   Produces: .nav-island, .nav-brand, .nav-wordmark, .nav-links, .nav-actions,
             .theme-toggle, .nav-burger, .btn, .btn-primary, .btn-go,
             .btn-secondary, .btn-ghost, .chip, .chip-dot (.is-live/.is-watch/
             .is-attention/.is-off), .telemetry, .card, .instrument-card,
             .panel, .panel-bar, .kpis, .kpi, .chart, .panel-foot,
             .frost, .diagram-card, .code (.c-key/.c-str/.c-num/.c-comment),
             .field, .skip-link
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Skip link — accessibility
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 9999;
  padding: var(--space-8) var(--space-16);
  background: var(--orange);
  color: #000;
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: var(--radius-sm);
  /* visually hidden until focused */
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  overflow: hidden;
  text-decoration: none;
}

.skip-link:focus {
  clip: auto;
  clip-path: none;
  overflow: visible;
  white-space: normal;
}

/* --------------------------------------------------------------------------
   2. Nav island
   -------------------------------------------------------------------------- */
.nav-island {
  position: sticky;
  top: var(--space-16);
  margin: var(--space-16) auto 0;
  max-width: var(--page-max);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-24);
  padding: var(--space-8) var(--space-12) var(--space-8) var(--space-16);
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--hair);
  border-radius: var(--radius-pill);
  z-index: 100;
  transition: background 0.2s ease;
}

[data-nav].scrolled {
  background: var(--nav-bg-scrolled);
}

/* --------------------------------------------------------------------------
   3. Nav brand + wordmark
   -------------------------------------------------------------------------- */
.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-brand:hover {
  text-decoration: none;
}

.nav-wordmark {
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--fg);
  line-height: 1;
}

.nav-wordmark em {
  font-style: normal;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   4. Nav links
   -------------------------------------------------------------------------- */
.nav-links {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: var(--space-24);
  list-style: none;
}

.nav-links a {
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: var(--text-caption);
  color: var(--fg-2);
  text-decoration: none;
  letter-spacing: 0.1em;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-links a:hover {
  color: var(--fg);
  text-decoration: none;
}

.nav-links a[aria-current="page"] {
  color: var(--fg);
  border-bottom-color: var(--orange);
}

/* --------------------------------------------------------------------------
   5. Nav actions + controls
   -------------------------------------------------------------------------- */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  flex-shrink: 0;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: 1px solid var(--hair);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--fg-2);
  font-family: var(--font-mono);
  font-size: 14px;
  transition: border-color 0.15s ease, color 0.15s ease;
  padding: 0;
}

.theme-toggle::before {
  content: "◑";
}

.theme-toggle:hover {
  border-color: var(--hair-active);
  color: var(--fg);
}

.nav-burger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: 1px solid var(--hair);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--fg-2);
  padding: 0;
  font-size: 16px;
  line-height: 1;
}

.nav-burger::before {
  content: "≡";
}

.nav-burger[aria-expanded="true"]::before {
  content: "✕";
}

/* --------------------------------------------------------------------------
   6. Mobile nav — collapse to burger below 1024px (full nav needs the room)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .nav-island {
    flex-wrap: wrap;
    border-radius: var(--radius-lg);
    gap: var(--space-12);
  }

  .nav-burger {
    display: inline-flex;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: var(--space-4);
    padding: var(--space-12) 0 var(--space-8);
    border-top: 1px solid var(--hair);
  }

  .nav-island.menu-open .nav-links {
    display: flex;
  }

  .nav-links a {
    font-size: var(--text-caption);
    padding: var(--space-8) 0;
  }
}

/* --------------------------------------------------------------------------
   7. Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: var(--text-caption);
  font-weight: var(--fw-medium);
  padding: var(--space-8) var(--space-16);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  line-height: 1;
  transition: opacity 0.15s ease, box-shadow 0.15s ease;
  white-space: nowrap;
}

.btn:hover {
  text-decoration: none;
  opacity: 0.85;
}

.btn:active {
  opacity: 0.7;
}

/* Signal fill — black text is intentional on bright signal backgrounds */
.btn-primary {
  background: var(--orange);
  color: #000;
  border-color: var(--orange);
}

.btn-go {
  background: var(--green);
  color: #000;
  border-color: var(--green);
}

.btn-secondary {
  background: transparent;
  color: var(--fg);
  border-color: var(--fg);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border-color: var(--hair);
}

/* --------------------------------------------------------------------------
   8. Status chips
   -------------------------------------------------------------------------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  border: 1px solid var(--hair);
  padding: var(--space-8) 14px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: var(--text-caption);
  letter-spacing: 0.1em;
  border-radius: var(--radius-pill);
  color: var(--fg-2);
  line-height: 1;
  white-space: nowrap;
}

.chip-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.chip-dot.is-live {
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
}

.chip-dot.is-watch {
  background: var(--yellow);
}

.chip-dot.is-attention {
  background: var(--orange);
}

.chip-dot.is-off {
  background: var(--muted);
}

/* --------------------------------------------------------------------------
   9. Telemetry bar
   -------------------------------------------------------------------------- */
.telemetry {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-24);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--hair);
  padding: var(--space-8) 0;
}

@media (max-width: 800px) {
  .telemetry {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   10. Card — base and instrument variant
   -------------------------------------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--hair);
  border-radius: var(--radius-sm);
  padding: var(--space-24);
}

.instrument-card {
  position: relative;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--hair);
  border-radius: var(--radius-sm);
  padding: var(--space-24);
  border-top: 2px solid var(--orange);
}

/* Cursor spotlight: driven by --mx/--my set in motion.js on pointermove.
   Gated on fine-pointer so it only fires for mouse users.                */
@media (hover: hover) and (pointer: fine) {
  .instrument-card::before {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(
      circle at var(--mx, 50%) var(--my, 50%),
      rgba(255, 255, 255, 0.05),
      transparent 40%
    );
    opacity: 0;
    transition: opacity 0.3s ease;
    border-radius: inherit;
  }

  .instrument-card:hover::before {
    opacity: 1;
  }
}

.instrument-card.signal-green {
  border-top-color: var(--green);
}

.instrument-card.signal-yellow {
  border-top-color: var(--yellow);
}

/* --------------------------------------------------------------------------
   11. Instrument panel
   -------------------------------------------------------------------------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--hair);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

/* panel-bar: header row with id badge + timestamp */
.panel-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-8) var(--space-16);
  border-bottom: 1px solid var(--hair);
  background: var(--surface-strong);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  gap: var(--space-16);
}

.panel-bar .panel-id {
  color: var(--orange);
  font-weight: var(--fw-bold);
}

/* kpis grid: 3-column layout with hairline dividers */
.kpis {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  padding: var(--space-20) var(--space-16);
  gap: 0;
}

.kpi {
  padding: 0 var(--space-16);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.kpi + .kpi {
  border-left: 1px solid var(--hair-faint);
}

.kpi:first-child {
  padding-left: 0;
}

.kpi:last-child {
  padding-right: 0;
}

/* kv = the big number (uses Syne via .display or direct font-family) */
.kpi .kv {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: var(--text-heading);
  line-height: var(--leading-tight);
  color: var(--fg);
  letter-spacing: var(--tracking-heading);
}

.kpi .kl {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* mini bar chart */
.chart {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 40px;
  padding: 0 var(--space-16) var(--space-12);
}

.chart-bar {
  flex: 1;
  min-height: 2px;
  border-radius: 1px 1px 0 0;
  /* height and background set via inline style (signal color) */
  background: var(--orange);
  transition: opacity 0.15s ease;
}

.chart-bar:hover {
  opacity: 0.7;
}

/* panel footer */
.panel-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-8) var(--space-16);
  border-top: 1px solid var(--hair-faint);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  gap: var(--space-16);
}

/* --------------------------------------------------------------------------
   12. Frosted hero card
   -------------------------------------------------------------------------- */
.frost {
  background: var(--frost-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--hair);
  border-radius: var(--radius-lg);
  padding: var(--space-32);
  box-shadow: var(--shadow-frost);
}

/* --------------------------------------------------------------------------
   13. Diagram cards
   -------------------------------------------------------------------------- */
.diagram-card {
  background: var(--surface);
  border: 1px solid var(--hair);
  border-radius: var(--radius-sm);
  padding: var(--space-24);
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

.diagram-card .diagram-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   14. Code blocks + syntax tokens
   -------------------------------------------------------------------------- */
.code {
  background: var(--lift);
  border: 1px solid var(--hair-faint);
  padding: var(--space-20);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.75;
  white-space: pre-wrap;
  overflow-x: auto;
  color: var(--fg-2);
  border-radius: var(--radius-sm);
}

/* Syntax highlight tokens */
.c-key     { color: var(--orange); }
.c-str     { color: var(--green); }
.c-num     { color: var(--yellow); }
.c-comment { color: var(--muted); }

/* --------------------------------------------------------------------------
   15. Field rows
   -------------------------------------------------------------------------- */
.field {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-16);
  border: 1px solid var(--hair);
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--fg-2);
}

.field + .field {
  border-top: none;
}

.field:first-child {
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.field:last-child {
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.field:only-child {
  border-radius: var(--radius-sm);
}

.field-key {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.65rem;
  flex-shrink: 0;
}

.field-value {
  color: var(--fg);
  text-align: right;
}

/* ---- long-form document hero + prose (phase 2) ---- */
.doc-hero {
  padding: var(--space-64) 0 var(--space-40);
  border-bottom: 1px solid var(--hair);
  margin-bottom: var(--space-40);
}
.doc-hero .lede { margin-top: var(--space-16); }
.doc-hero .link-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-12);
  margin-top: var(--space-24);
}
.prose { max-width: 65ch; color: var(--fg-2); }
.prose > * + * { margin-top: var(--space-16); }
.prose h2 {
  font-family: var(--font-display);
  font-weight: var(--fw-semibold);
  font-size: 1.5rem;
  line-height: 1.2;
  letter-spacing: var(--tracking-heading);
  color: var(--fg);
  margin-top: var(--space-48);
}
.prose h3 {
  font-family: var(--font-display);
  font-weight: var(--fw-semibold);
  font-size: var(--text-subheading);
  color: var(--fg);
  margin-top: var(--space-32);
}
.prose p { font-size: var(--text-body); line-height: var(--leading-body); }
.prose ul, .prose ol { padding-left: var(--space-24); }
.prose li { margin-top: var(--space-8); line-height: var(--leading-body); }
.prose a { color: var(--orange); text-decoration: underline; text-underline-offset: 2px; }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--lift);
  border: 1px solid var(--hair);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.4em;
}
.prose pre {
  background: var(--lift);
  border: 1px solid var(--hair);
  border-radius: var(--radius-md);
  padding: var(--space-16);
  overflow-x: auto;
}
.prose pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: var(--text-caption);
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--fg-2);
}
.citation {
  margin-top: var(--space-48);
  border: 1px solid var(--hair);
  padding: var(--space-20);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  line-height: 1.6;
  color: var(--fg-3);
  word-break: break-word;
}
.citation .cite-label {
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin-bottom: var(--space-8);
}

/* --------------------------------------------------------------------------
   16. Site footer
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: var(--space-80);
  border-top: 1px solid var(--hair);
  padding: var(--space-48) 0 var(--space-32);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-48);
  align-items: start;
}
.footer-name { color: var(--fg); font-size: var(--text-body); }
.footer-name strong { font-weight: var(--fw-semibold); }
.footer-addr {
  margin-top: var(--space-8);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  letter-spacing: 0.04em;
  color: var(--muted);
}
.footer-addr a { color: var(--fg-2); }
.footer-desc {
  margin-top: var(--space-16);
  max-width: 58ch;
  font-size: var(--text-caption);
  line-height: var(--leading-body);
  color: var(--fg-3);
}
.footer-links {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-8);
}
.footer-links a {
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: var(--text-caption);
  letter-spacing: 0.1em;
  color: var(--fg-2);
  text-decoration: none;
}
.footer-links a:hover { color: var(--fg); }
.footer-base {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-16);
  margin-top: var(--space-40);
  padding-top: var(--space-20);
  border-top: 1px solid var(--hair-faint);
}
.footer-license { font-size: var(--text-caption); line-height: var(--leading-body); color: var(--muted); }
.footer-license a { color: var(--fg-2); text-decoration: underline; text-underline-offset: 2px; }
@media (max-width: 800px) {
  .footer-inner { grid-template-columns: 1fr; gap: var(--space-24); }
  .footer-links { flex-direction: row; flex-wrap: wrap; align-items: flex-start; gap: var(--space-16); }
  .footer-base { flex-direction: column; align-items: flex-start; gap: var(--space-12); }
}