/* docs/DESIGN.md tokens — blueprint/technical direction. */

:root {
  --bg: #0a1826;
  --surface-1: #0f2136;
  --surface-2: #15304a;
  --line: #254a68;
  --text: #e8f2fb;
  --text-muted: #7fa1bd;
  --accent: #5ec8f2;
  --accent-support: #f2a65e;
  --success: #5ef2a6;
  --danger: #f25e5e;

  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace;
  --font-sans: "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;

  --step--1: 13px;
  --step-0: 16px;
  --step-1: 20px;
  --step-2: 25px;
  --step-3: 31px;
  --step-4: 39px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;

  --radius: 2px;
  --motion-ui: 180ms ease-out;
  --motion-connector: 380ms ease-out;

  --grid-line: rgba(37, 74, 104, 0.08);
}

/* Blueprint graph-paper texture: a faint grid over the deep navy ground,
   applied to every full-bleed surface so empty space still reads as part
   of the schematic instead of a blank void. */
.graph-paper,
body {
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: -1px -1px;
}

* {
  box-sizing: border-box;
}

/* Screen-reader-only content: kept in the accessibility tree and announced
   by aria-live, but never visible or able to affect layout. */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--step-0);
  color: var(--text);
  padding: var(--space-6);
  background-attachment: fixed;
}

.site-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

/* A schematic-style call-out button (dashed-to-solid on hover), pinned
   top-right so the repo is always one click away without competing with the
   wordmark. */
.repo-link {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--text-muted);
  text-decoration: none;
  background: var(--surface-1);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-4);
  min-height: 44px;
  transition: border-color var(--motion-ui), color var(--motion-ui);
}

.repo-link:hover {
  color: var(--text);
  border-color: var(--accent);
}

.repo-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.repo-link__mark {
  color: var(--accent);
}

.wordmark {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--step-4);
  letter-spacing: -0.01em;
}

.wordmark__glyph {
  color: var(--accent);
  margin-right: var(--space-2);
}

.tagline {
  margin: 0;
  max-width: 60ch;
  color: var(--text-muted);
  font-size: var(--step-1);
}

/* Five preset groups (swap/trigger/target/select/indicator) wrap onto more
   than one row once they no longer fit a single 72px strip — still a
   compact toolbar, just no longer guaranteed single-line at every width. */
.preset-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4) var(--space-6);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-6);
  background: var(--surface-1);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.preset-group {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.preset-group__label {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.preset-toggle {
  display: flex;
  gap: var(--space-2);
}

.preset-toggle__option {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--text-muted);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-4);
  min-height: 44px;
  cursor: pointer;
  transition: border-color var(--motion-ui), color var(--motion-ui), background-color var(--motion-ui);
}

.preset-toggle__option:hover {
  color: var(--text);
  border-color: var(--accent);
}

.preset-toggle__option:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.preset-toggle__option:active {
  transform: translateY(1px);
}

.preset-toggle__option.is-active {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
}

.preset-toggle__option:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* hx-select / hx-indicator: a schematic-style LED toggle rather than an
   iOS-style pill — the dot lights up (fills, gains a glow) when on, staying
   in the blueprint idiom instead of borrowing an unrelated visual language. */
.preset-switch {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--text-muted);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-4);
  min-height: 44px;
  cursor: pointer;
  transition: border-color var(--motion-ui), color var(--motion-ui), background-color var(--motion-ui);
}

.preset-switch__track {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--line);
  transition: background-color var(--motion-ui), box-shadow var(--motion-ui);
}

.preset-switch:hover {
  color: var(--text);
  border-color: var(--accent);
}

.preset-switch:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.preset-switch:active {
  transform: translateY(1px);
}

.preset-switch.is-on {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
}

.preset-switch.is-on .preset-switch__track {
  background: var(--bg);
  box-shadow: 0 0 6px 1px rgba(10, 24, 38, 0.6);
}

.preset-switch:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Pinned to the end of the preset bar via margin-left: auto so it reads as
   a distinct action ("do something with this state") rather than another
   preset ("set part of this state"). */
.copy-link-btn {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-4);
  min-height: 44px;
  cursor: pointer;
  transition: border-color var(--motion-ui), color var(--motion-ui), background-color var(--motion-ui);
}

.copy-link-btn:hover {
  color: var(--text);
  border-color: var(--accent-support);
}

.copy-link-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.copy-link-btn:active {
  transform: translateY(1px);
}

.copy-link-btn.is-copied {
  color: var(--bg);
  background: var(--accent-support);
  border-color: var(--accent-support);
}

/* The rig: live element (~40%) beside the network + DOM patch panel stack
   (~60%), together occupying the majority of the viewport per DESIGN.md's
   layout intent. Connector lines are absolutely positioned over the grid
   and given their endpoints by app.js (it measures the actual zones). */
.rig {
  position: relative;
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: var(--space-6);
  min-height: 64vh;
}

/* An explicit display on .rig/.compare-grid would otherwise win over the UA
   [hidden]{display:none} rule (author origin beats UA), leaving a "hidden" rig
   still visible when comparison mode swaps them — pin hidden back to none. */
.rig[hidden],
.compare-rig[hidden] {
  display: none;
}

.panels {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.connectors {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

/* app.js sets stroke-dasharray to the line's own length (one dash spanning
   the whole path) so the dashoffset animation reads as the line drawing
   itself rather than its dashes marching along a fixed pattern. */
.connector {
  stroke: var(--accent);
  stroke-width: 2;
  stroke-dashoffset: 0;
  fill: none;
  opacity: 0;
  transition: opacity var(--motion-connector);
}

/* app.js sets the dasharray to the line's own length and toggles this
   class; the browser animates dashoffset from full-length (invisible)
   to 0 (fully traced) — the "line drawing itself" signature detail. */
.connector.is-firing {
  opacity: 1;
  animation: connector-trace var(--motion-connector) ease-out forwards;
}

@keyframes connector-trace {
  from {
    stroke-dashoffset: var(--connector-length, 0);
  }
  to {
    stroke-dashoffset: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .connector.is-firing {
    animation: none;
    stroke-dashoffset: 0;
  }
}

.zone {
  position: relative;
  background-color: var(--surface-1);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
}

.zone--stage {
  align-items: center;
  justify-content: center;
}

.zone--network,
.zone--patch {
  flex: 1;
}

.zone__annotation {
  position: absolute;
  top: var(--space-2);
  left: var(--space-4);
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.demo-stage {
  margin-top: var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

/* htmx toggles the .htmx-request class on the indicator element while a
   request is in flight (see hx-indicator on #demo-el) — this is the
   conventional opacity-fade pairing that convention expects. */
.htmx-indicator {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--accent-support);
  opacity: 0;
  transition: opacity 200ms ease-in;
}

.htmx-request .htmx-indicator,
.htmx-request.htmx-indicator {
  opacity: 1;
}

/* The external hx-target destination: dashed and muted while idle (self
   target active), solid and lit once the target preset actually points at
   it, so which element will receive the next swap is legible at a glance.
   The emphasis/annotation live on this stable wrapper rather than on
   #demo-target-external itself, which htmx replaces wholesale on every
   outerHTML swap — anything placed on the swapped node directly would be
   discarded along with it. */
.external-target-wrap {
  margin-top: var(--space-6);
  width: 100%;
  max-width: 320px;
  padding: var(--space-3) var(--space-4);
  background: var(--surface-2);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--text-muted);
  text-align: center;
  transition: border-color var(--motion-ui), color var(--motion-ui), box-shadow var(--motion-ui);
}

.external-target-wrap .zone__annotation--inline {
  position: static;
  display: block;
  margin-bottom: var(--space-2);
}

.external-target-wrap.is-active-target {
  border-style: solid;
  border-color: var(--accent);
  color: var(--text);
  box-shadow: inset 0 0 0 1px rgba(94, 200, 242, 0.15);
}

.demo-target-external {
  font-family: var(--font-mono);
  font-size: var(--step--1);
}

.demo-target-external.is-flashing {
  animation: patch-flash 700ms ease-out;
}

.demo-el {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: var(--space-4) var(--space-8);
  min-height: 44px;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(94, 200, 242, 0.15);
  transition: border-color var(--motion-ui), transform var(--motion-ui), box-shadow var(--motion-ui);
}

.demo-el:hover {
  border-color: var(--accent-support);
}

.demo-el:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.demo-el:active {
  transform: translateY(1px);
}

.demo-el.is-flashing {
  animation: patch-flash 700ms ease-out;
}

@keyframes patch-flash {
  0%,
  100% {
    border-color: var(--accent);
    box-shadow: inset 0 0 0 1px rgba(94, 200, 242, 0.15);
  }
  30% {
    border-color: var(--accent-support);
    box-shadow: inset 0 0 0 2px var(--accent-support), 0 0 0 4px rgba(242, 166, 94, 0.2);
  }
}

.patch-panel__code mark.is-flashing {
  animation: mark-flash 700ms ease-out;
}

@keyframes mark-flash {
  0%,
  100% {
    background: rgba(242, 166, 94, 0.35);
  }
  30% {
    background: rgba(242, 166, 94, 0.7);
  }
}

@media (prefers-reduced-motion: reduce) {
  .demo-el.is-flashing,
  .demo-target-external.is-flashing,
  .patch-panel__code mark.is-flashing {
    animation: none;
    border-color: var(--accent-support);
  }

  /* The mode toggle's glyph spins on activation; drop the rotation so it just
     changes state under reduced motion (the on/off styling still reads). */
  .mode-toggle__glyph {
    transition: none;
  }

  .mode-toggle.is-on .mode-toggle__glyph {
    transform: none;
  }
}

.network-panel {
  margin: var(--space-6) 0 var(--space-4);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-2) var(--space-4);
}

.network-panel__row {
  display: contents;
}

.network-panel dt {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.network-panel dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--text);
  word-break: break-all;
}

.status-chip {
  display: inline-block;
  padding: 0 var(--space-2);
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--line);
}

.status-chip.is-success {
  color: var(--success);
  border-color: var(--success);
}

.status-chip.is-error {
  color: var(--danger);
  border-color: var(--danger);
}

.network-panel__label,
.patch-panel__label {
  margin: var(--space-2) 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.network-panel__code,
.patch-panel__code {
  margin: 0 0 var(--space-3);
  padding: var(--space-3);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
  overflow: auto;
  max-height: 12em;
}

.patch-panel__code {
  flex: 1;
  max-height: none;
}

.patch-panel__code mark {
  background: rgba(242, 166, 94, 0.35);
  color: var(--accent-support);
  border-radius: var(--radius);
  padding: 0 2px;
}

.rig-pulse {
  display: none;
}

/* Comparison-mode toggle: styled as a distinct mode switch (amber support
   accent) rather than another preset chip, so entering/leaving the two-lab
   view reads as a mode change, not a value change. */
.mode-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--text-muted);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-2) var(--space-4);
  min-height: 44px;
  cursor: pointer;
  transition: border-color var(--motion-ui), color var(--motion-ui), background-color var(--motion-ui);
}

.mode-toggle__glyph {
  color: var(--accent-support);
  transition: transform var(--motion-ui);
}

.mode-toggle:hover {
  color: var(--text);
  border-color: var(--accent-support);
}

.mode-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.mode-toggle:active {
  transform: translateY(1px);
}

.mode-toggle.is-on {
  color: var(--bg);
  background: var(--accent-support);
  border-color: var(--accent-support);
}

.mode-toggle.is-on .mode-toggle__glyph {
  color: var(--bg);
  transform: rotate(180deg);
}

/* A preset group whose values don't apply in comparison mode (swap is the
   axis being compared, trigger is the shared Fire-both button, target is
   pinned to self): dimmed as a set so it's obviously inert, not broken. */
.preset-toggle.is-disabled {
  opacity: 0.45;
}

/* Comparison rig: a shared fire bar over two side-by-side labs, each a full
   instrument (live element + status + response + DOM patch) so the same
   request's two swap outcomes sit literally next to each other. */
.compare-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.compare-bar__hint {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--step-0);
}

.compare-fire {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--step-0);
  color: var(--bg);
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-8);
  min-height: 44px;
  cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(94, 200, 242, 0.25);
  transition: border-color var(--motion-ui), transform var(--motion-ui), box-shadow var(--motion-ui);
}

.compare-fire:hover {
  border-color: var(--accent-support);
  box-shadow: inset 0 0 0 2px var(--accent-support);
}

.compare-fire:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.compare-fire:active {
  transform: translateY(1px);
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}

.compare-lab {
  position: relative;
  display: flex;
  flex-direction: column;
  background-color: var(--surface-1);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-4);
}

.compare-lab__title {
  margin: 0 0 var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--step-0);
  color: var(--accent);
}

.compare-lab__title code {
  color: var(--text);
}

.compare-lab__stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-6) 0;
}

.demo-el--compare {
  font-size: var(--step-0);
  padding: var(--space-3) var(--space-6);
}

/* Tablet and phone: the 40/60 side-by-side split has no room to breathe
   below ~1024px, so the rig collapses to a single column stacked in
   fire-order (stage, then network, then patch) — the same order the
   markup is already written in. */
@media (max-width: 1023px) {
  body {
    padding: var(--space-4);
  }

  .rig {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .connectors {
    display: none;
  }

  .rig-pulse {
    display: block;
    width: 2px;
    height: var(--space-6);
    margin: 0 auto;
    background: var(--line);
  }

  .rig-pulse.is-firing {
    animation: rig-pulse-sweep var(--motion-connector) ease-out;
  }

  .preset-bar {
    flex-wrap: nowrap;
    overflow-x: auto;
  }

  .preset-group,
  .copy-link-btn {
    flex-shrink: 0;
  }

  /* The 40/60 rig has no room below ~1024px and neither do two lab columns:
     stack the comparison labs in fire order (innerHTML then outerHTML), the
     same vertical rhythm the single rig collapses to. */
  .compare-grid {
    grid-template-columns: 1fr;
  }

  .compare-fire {
    margin-left: 0;
    width: 100%;
  }
}

@keyframes rig-pulse-sweep {
  0%,
  100% {
    background: var(--line);
  }
  50% {
    background: var(--accent);
  }
}

@media (prefers-reduced-motion: reduce) {
  .rig-pulse.is-firing {
    animation: none;
  }
}

@media (max-width: 480px) {
  .wordmark {
    font-size: var(--step-3);
  }

  .demo-el {
    padding: var(--space-3) var(--space-6);
    font-size: var(--step-0);
  }

  .preset-bar {
    gap: var(--space-2);
  }
}

/* Below-the-fold reference copy + FAQ: the same schematic surface as the rig,
   set at a readable measure so it reads as documentation stamped onto the
   blueprint rather than a separate marketing page. */
.prose {
  margin-top: var(--space-16);
  padding-top: var(--space-8);
  border-top: 1px solid var(--line);
}

.prose__inner {
  max-width: 70ch;
}

.prose__h2 {
  margin: var(--space-8) 0 var(--space-3);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--step-2);
  letter-spacing: -0.01em;
}

.prose__h2:first-child {
  margin-top: 0;
}

.prose__h3 {
  margin: var(--space-6) 0 var(--space-2);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--step-1);
  color: var(--accent);
}

.prose p {
  margin: 0 0 var(--space-4);
  color: var(--text-muted);
  line-height: 1.6;
}

.prose code,
.faq code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--accent);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 var(--space-1);
}

.prose a,
.faq a,
.portfolio-link {
  color: var(--accent);
}

.faq {
  margin: 0;
}

.faq__q {
  margin-top: var(--space-4);
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text);
}

.faq__a {
  margin: var(--space-2) 0 0;
  color: var(--text-muted);
  line-height: 1.6;
}

.site-footer {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--line);
}

.portfolio-link {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  text-decoration: none;
  color: var(--text-muted);
  transition: color var(--motion-ui);
}

.portfolio-link:hover {
  color: var(--accent);
}

.portfolio-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 480px) {
  .site-header {
    flex-direction: column;
    gap: var(--space-3);
  }
}