/* ==========================================================================
   Refract — Cutaway
   An image API presented as a bench instrument. Graphite floor, cold metal,
   two voltages of light (magenta->violet + cyan flow). No paper, no serif,
   nothing above 4px radius, no pill and no circle in the system.
   ========================================================================== */

/* ---- Fonts (self-hosted, no CDN) ---------------------------------------- */
@font-face {
  font-family: "Archivo";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("./assets/fonts/archivo-400.woff2") format("woff2");
}
@font-face {
  font-family: "Archivo";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("./assets/fonts/archivo-500.woff2") format("woff2");
}
@font-face {
  font-family: "Archivo";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("./assets/fonts/archivo-600.woff2") format("woff2");
}
@font-face {
  font-family: "Archivo";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("./assets/fonts/archivo-700.woff2") format("woff2");
}
@font-face {
  font-family: "Archivo";
  font-style: normal;
  font-weight: 800;
  font-display: swap;
  src: url("./assets/fonts/archivo-800.woff2") format("woff2");
}
@font-face {
  font-family: "Chivo Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("./assets/fonts/chivo-mono-400.woff2") format("woff2");
}

/* ---- Tokens ------------------------------------------------------------- */
:root {
  /* Cold metal, two voltages, no paper. */
  --canvas: #141618;
  --panel: #1c1f22;
  --panel-raised: #2a2e33;
  --hairline: #2a2e33;
  --hairline-strong: #3a3f45;
  --ink: #ffffff;
  --ink-soft: #c9ced3;
  --ink-mid: #a9afb6;
  --ink-faint: #8b9199;
  --ink-dim: #6e747b;
  --magenta: #e4007c;
  --magenta-bright: #ff2ea6;
  --magenta-deep: #b4006b;
  --violet: #7a1fa2;
  --violet-deep: #4a1270;
  --cyan: #00b7ce;

  /* Spacing scale: 2 4 8 12 16 24 40 64 96 */
  --s-2: 2px;
  --s-4: 4px;
  --s-8: 8px;
  --s-12: 12px;
  --s-16: 16px;
  --s-24: 24px;
  --s-40: 40px;
  --s-64: 64px;
  --s-96: 96px;

  --font-sans: "Archivo", system-ui, "Segoe UI", sans-serif;
  --font-mono: "Chivo Mono", ui-monospace, "SFMono-Regular", monospace;

  /* Emissive glow permitted only on connectors + crop rectangle. */
  --glow-magenta: drop-shadow(0 0 6px rgba(228, 0, 124, 0.45));

  --container: 1280px;
  --reading: 1080px;
}

/* ---- Reset-ish ---------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink-soft);
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font-family: inherit;
  cursor: pointer;
}
ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* Focus: 2px magenta ring at 2px offset, on every interactive element,
   never removed. Implemented as outline (not box-shadow, which is banned). */
:focus-visible {
  outline: 2px solid var(--magenta);
  outline-offset: 2px;
}

/* ---- Layout scaffolding ------------------------------------------------- */
.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--s-24);
}
.reading {
  max-width: var(--reading);
  margin-inline: auto;
  padding-inline: var(--s-24);
}
.band {
  padding-block: var(--s-96);
}
.band--dense {
  padding-block: var(--s-64);
}
.band--panel {
  background: var(--panel);
}
.hairline-top {
  border-top: 1px solid var(--hairline);
}
.hairline-bottom {
  border-bottom: 1px solid var(--hairline);
}

/* ---- Type roles --------------------------------------------------------- */
.t-readout {
  font-weight: 800;
  font-size: 88px;
  line-height: 0.95;
  letter-spacing: -2px;
  color: var(--ink);
  font-feature-settings: "tnum" 1;
}
.t-display-xxl {
  font-weight: 800;
  font-size: 72px;
  line-height: 1;
  letter-spacing: -1.5px;
  color: var(--ink);
}
.t-display-xl {
  font-weight: 800;
  font-size: 52px;
  line-height: 1.02;
  letter-spacing: -1px;
  color: var(--ink);
}
.t-display-l {
  font-weight: 700;
  font-size: 36px;
  line-height: 1.08;
  letter-spacing: -0.5px;
  color: var(--ink);
}
.t-display-m {
  font-weight: 700;
  font-size: 28px;
  line-height: 1.15;
  letter-spacing: -0.3px;
  color: var(--ink);
}
.t-heading {
  font-weight: 700;
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: -0.1px;
  color: var(--ink);
}
.t-spec-unit {
  font-weight: 600;
  font-size: 20px;
  line-height: 1;
  letter-spacing: 0.4px;
  color: var(--ink);
}
.t-body-l {
  font-weight: 400;
  font-size: 18px;
  line-height: 1.55;
}
.t-body {
  font-weight: 400;
  font-size: 16px;
  line-height: 1.55;
}
.t-body-s {
  font-weight: 400;
  font-size: 14px;
  line-height: 1.5;
}
.t-data {
  font-weight: 500;
  font-size: 15px;
  line-height: 1.4;
  font-feature-settings: "tnum" 1;
}
.t-button {
  font-weight: 700;
  font-size: 15px;
  line-height: 1;
  letter-spacing: 0.3px;
}
.t-nav {
  font-weight: 600;
  font-size: 14px;
  line-height: 1.4;
  letter-spacing: 0.2px;
}
.t-caption {
  font-weight: 400;
  font-size: 13px;
  line-height: 1.4;
  color: var(--ink-mid);
}
.t-overline {
  font-weight: 700;
  font-size: 12px;
  line-height: 1.3;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  font-feature-settings: "case" 1;
  color: var(--ink-mid);
}
.t-micro {
  font-weight: 500;
  font-size: 11px;
  line-height: 1.3;
  letter-spacing: 0.2px;
}
.t-url {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  font-feature-settings: "zero" 1;
}
.t-code {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 14px;
  line-height: 1.6;
  font-feature-settings: "zero" 1;
}

/* Ink steps as helpers */
.ink {
  color: var(--ink);
}
.ink-soft {
  color: var(--ink-soft);
}
.ink-mid {
  color: var(--ink-mid);
}
.ink-faint {
  color: var(--ink-faint);
}
.ink-dim {
  color: var(--ink-dim);
}
.cyan {
  color: var(--cyan);
}

/* ---- Nav ---------------------------------------------------------------- */
.nav {
  height: 64px;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  position: sticky;
  top: 0;
  z-index: 50;
}
.nav__inner {
  height: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--s-24);
  display: flex;
  align-items: center;
  gap: var(--s-24);
}
.wordmark {
  font-weight: 800;
  font-size: 22px;
  line-height: 1;
  letter-spacing: -0.4px;
  color: var(--ink);
}
.nav__tabs {
  display: flex;
  align-items: center;
  gap: var(--s-24);
  margin-left: var(--s-24);
}
.nav__tab {
  color: var(--ink-mid);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.2px;
  padding-block: 4px;
  border-bottom: 2px solid transparent;
}
.nav__tab:hover {
  color: var(--ink);
}
.nav__tab.is-active,
.nav__tab[aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
  border-bottom-color: var(--magenta);
}
.nav__spacer {
  flex: 1;
}

/* ---- Buttons ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 14px 28px;
  border-radius: 2px;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.3px;
  transition: background-color 120ms ease-out, color 120ms ease-out,
    border-color 120ms ease-out;
}
.btn--primary {
  background: var(--magenta);
  color: var(--ink);
  border-color: var(--magenta);
}
.btn--primary:hover {
  background: var(--magenta);
}
.btn--primary:active {
  background: var(--magenta-deep);
  border-color: var(--magenta-deep);
}
.btn--outline {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink-faint);
}
.btn--outline:hover {
  border-color: var(--ink);
}
.btn--full {
  width: 100%;
}
.btn--sm {
  height: 36px;
  padding: 8px 16px;
}
.link-tertiary {
  background: none;
  border: 0;
  padding: 0;
  color: var(--magenta-bright);
  font-weight: 600;
}
.link-tertiary:hover {
  text-decoration: underline;
}

/* ---- Hero band ---------------------------------------------------------- */
.hero {
  background: var(--canvas);
  padding-block: var(--s-96);
  overflow: hidden;
  position: relative;
}
/* Violet->magenta atmospheric wash behind the exploded stack only.
   Carries no meaning; never sits behind body copy. */
.hero::before {
  content: "";
  position: absolute;
  top: 8%;
  left: -6%;
  width: 62%;
  height: 84%;
  background: radial-gradient(
    60% 60% at 40% 45%,
    rgba(122, 31, 162, 0.32),
    rgba(228, 0, 124, 0.12) 55%,
    transparent 75%
  );
  filter: blur(30px);
  pointer-events: none;
  z-index: 0;
}
.hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(360px, 460px);
  gap: var(--s-64);
  align-items: start;
}
.hero__intro {
  grid-column: 1 / -1;
  max-width: 760px;
  margin-bottom: var(--s-40);
}
.hero__eyebrow {
  color: var(--ink-mid);
  margin-bottom: var(--s-16);
}
.hero__title {
  margin: 0 0 var(--s-16);
}
.hero__sub {
  color: var(--ink-soft);
  margin: 0;
  max-width: 620px;
}

/* ---- The exploded stack (3D) -------------------------------------------- */
.stage {
  display: flex;
  gap: var(--s-24);
  align-items: stretch;
}
.stack-scene {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;
  height: 420px;
  perspective: 1600px;
}
.stack-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
}
.plane {
  position: absolute;
  left: 46%;
  top: 50%;
  width: 300px;
  height: 225px;
  margin-left: -150px;
  margin-top: -112px;
  transform-style: preserve-3d;
  transition: transform 400ms cubic-bezier(0.2, 0, 0, 1);
  will-change: transform;
}
.plane__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* hard shadow inside the frame comes from the photograph itself; the plate
     is square-cornered and never clipped by a radius. */
  border: 1px solid var(--hairline-strong);
  background: var(--canvas);
}
.plane__tag {
  position: absolute;
  top: -18px;
  left: 0;
  white-space: nowrap;
}
/* Exploded positions, back(1) -> front(4). Fixed tilt: no pointer, no scroll. */
.plane[data-plane="1"] {
  transform: rotateY(-24deg) rotateX(8deg) translateZ(0);
}
.plane[data-plane="2"] {
  transform: rotateY(-24deg) rotateX(8deg) translateZ(80px);
}
.plane[data-plane="3"] {
  transform: rotateY(-24deg) rotateX(8deg) translateZ(160px);
}
.plane[data-plane="4"] {
  transform: rotateY(-24deg) rotateX(8deg) translateZ(240px);
}
/* Assembly start state: flush single flat photograph. JS removes .is-flat. */
.stack-inner.is-flat .plane {
  transform: rotateY(0deg) rotateX(0deg) translateZ(0);
}

/* The letterbox painted inside plane 3 when fit=contain (visitor's bg data). */
.plane__letterbox {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: transparent;
}
/* The crop rectangle — a CSS border carrying the one permitted emissive glow. */
.crop-rect {
  position: absolute;
  inset: 12% 14%;
  border: 1px solid var(--magenta);
  filter: var(--glow-magenta);
  pointer-events: none;
  opacity: 0;
  transition: opacity 120ms ease-out;
}
.plane[data-plane="3"].crop-live .crop-rect {
  opacity: 1;
}

/* Connector overlay (SVG). Endpoints computed from live layout in app.js. */
.connectors {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 5;
  overflow: visible;
}
.connectors line {
  stroke-width: 1;
  filter: var(--glow-magenta);
}

/* The three 88px plane readouts, beside the stack. */
.plane-readouts {
  flex: 0 0 176px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--s-24);
  padding-top: var(--s-16);
}
.readout {
  display: flex;
  flex-direction: column;
  gap: var(--s-8);
}
.readout__over {
  display: flex;
  align-items: center;
  gap: var(--s-8);
}
.readout__figure {
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.readout__key {
  color: var(--ink-mid);
}
.readout__val {
  color: var(--ink);
}
.readout__val--magenta {
  color: var(--magenta);
}

/* ---- server-side tag (cyan, square) ------------------------------------- */
.tag-server {
  display: inline-flex;
  align-items: center;
  color: var(--cyan);
  border: 1px solid var(--cyan);
  border-radius: 0;
  padding: 2px 8px;
  font-weight: 700;
  font-size: 12px;
  line-height: 1.1;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  font-feature-settings: "case" 1;
}

/* ---- Instrument panel --------------------------------------------------- */
.panel {
  background: var(--panel);
  border-radius: 4px;
  padding: var(--s-40);
}
.panel__title {
  margin: 0 0 var(--s-24);
}
.panel__strips {
  display: flex;
  flex-direction: column;
}
.strip {
  display: grid;
  grid-template-columns: 12px 56px minmax(0, 1fr) 96px;
  align-items: center;
  gap: var(--s-16);
  padding-block: var(--s-16);
  border-top: 1px solid var(--hairline);
}
.strip:first-child {
  border-top: 0;
}
.strip__marker {
  width: 6px;
  height: 6px;
  border-radius: 0;
  background: var(--hairline-strong);
  justify-self: start;
}
.strip.is-set .strip__marker {
  background: var(--magenta);
}
.strip__key {
  color: var(--ink-mid);
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 14px;
  font-feature-settings: "zero" 1;
}
.strip.is-set .strip__key {
  color: var(--ink);
}
.strip__control {
  min-width: 0;
}
.strip__value {
  justify-self: end;
  text-align: right;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 14px;
  font-feature-settings: "zero" 1;
  white-space: nowrap;
}
.strip:not(.is-set) .strip__value {
  color: var(--ink-dim);
}
.strip.is-disabled {
  opacity: 1;
}
.strip.is-disabled .strip__key {
  color: var(--ink-dim);
}

/* server-side rows inside the panel: no marker, no control */
.strip--server {
  grid-template-columns: 12px 56px minmax(0, 1fr) auto;
}
.strip--server .strip__value {
  color: var(--ink-mid);
}

/* ---- fader -------------------------------------------------------------- */
.fader-row {
  display: flex;
  align-items: center;
  gap: var(--s-12);
}
.fader {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 20px;
  background: transparent;
  margin: 0;
}
.fader::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--hairline-strong);
  border-radius: 0;
}
.fader::-moz-range-track {
  height: 2px;
  background: var(--hairline-strong);
  border-radius: 0;
}
.fader::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 4px;
  height: 20px;
  border-radius: 0;
  background: var(--ink);
  border: 0;
  margin-top: -9px;
}
.fader::-moz-range-thumb {
  width: 4px;
  height: 20px;
  border-radius: 0;
  background: var(--ink);
  border: 0;
}
.fader:focus-visible {
  outline: none;
}
.fader:focus-visible::-webkit-slider-thumb {
  outline: 2px solid var(--magenta);
  outline-offset: 2px;
}
.fader:focus-visible::-moz-range-thumb {
  outline: 2px solid var(--magenta);
  outline-offset: 2px;
}

/* ---- text input --------------------------------------------------------- */
.text-input {
  height: 48px;
  padding: 14px 16px;
  background: var(--panel-raised);
  color: var(--ink);
  border: 1px solid var(--hairline-strong);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-feature-settings: "zero" 1;
  width: 100%;
}
.text-input::placeholder {
  color: var(--ink-mid);
}
.text-input:focus-visible {
  outline: 2px solid var(--magenta);
  outline-offset: 2px;
  border-color: var(--hairline-strong);
}
.text-input.is-error {
  outline: 2px solid var(--magenta);
  outline-offset: 2px;
}
.text-input--num {
  width: 76px;
  flex: 0 0 auto;
}
.text-input--hex {
  width: 116px;
  flex: 0 0 auto;
}
.field-error {
  color: var(--magenta-bright);
  margin-top: var(--s-8);
}

/* ---- selector (hard-edged segmented bank) ------------------------------- */
.selector {
  display: inline-flex;
  border: 1px solid var(--hairline);
  border-radius: 2px;
  overflow: hidden;
}
.selector__cell {
  background: transparent;
  border: 0;
  border-left: 1px solid var(--hairline);
  color: var(--ink-mid);
  font-weight: 400;
  font-size: 14px;
  line-height: 1.5;
  padding: 8px 12px;
  border-radius: 0;
  transition: background-color 120ms ease-out, color 120ms ease-out;
}
.selector__cell:first-child {
  border-left: 0;
}
.selector__cell:hover {
  color: var(--ink);
}
.selector__cell[aria-checked="true"] {
  background: var(--panel-raised);
  color: var(--ink);
  font-weight: 700;
}
.selector--disabled .selector__cell,
.strip.is-disabled .selector__cell {
  color: var(--ink-dim);
  pointer-events: none;
}

/* ---- swatches (bg channel) ---------------------------------------------- */
.swatches {
  display: flex;
  align-items: center;
  gap: var(--s-8);
  flex-wrap: wrap;
}
.swatch {
  width: 24px;
  height: 24px;
  border-radius: 0;
  border: 1px solid var(--hairline-strong);
  padding: 0;
  background: var(--panel-raised);
}
.swatch[aria-pressed="true"] {
  border-color: var(--ink);
}
.strip.is-disabled .swatch {
  pointer-events: none;
  opacity: 0.5;
}

/* ---- URL string --------------------------------------------------------- */
.url-bar {
  display: flex;
  align-items: center;
  gap: var(--s-16);
  margin-top: var(--s-24);
  padding-top: var(--s-24);
  border-top: 1px solid var(--hairline);
}
.url-string {
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
  white-space: nowrap;
  color: var(--ink);
  padding-bottom: 2px;
}
.url-string .k {
  color: var(--cyan);
}
.url-string .v {
  color: var(--ink);
}
.url-string .server {
  color: var(--ink-mid);
}
.url-string .server-k {
  color: var(--ink-mid);
}

/* ---- Capability cards --------------------------------------------------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-24);
}
.card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.card__plate {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 0;
  border-bottom: 1px solid var(--hairline);
}
.card__body {
  padding: var(--s-40);
  display: flex;
  flex-direction: column;
  gap: var(--s-16);
}
.card__title {
  margin: 0;
}
.card__copy {
  margin: 0;
  color: var(--ink-soft);
}
.card__figure {
  color: var(--ink-mid);
  margin-top: var(--s-8);
}

/* ---- Before/after demo -------------------------------------------------- */
.demo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-24);
}
.demo__plate {
  position: relative;
  aspect-ratio: 4 / 3;
  background: var(--canvas);
  border: 1px solid var(--hairline-strong);
  overflow: hidden;
}
.demo__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.demo__over {
  position: absolute;
  top: var(--s-12);
  left: var(--s-12);
}
.demo__caption {
  grid-column: 1 / -1;
  margin: var(--s-16) 0 0;
  color: var(--ink-mid);
}
.demo__caption code {
  font-family: var(--font-mono);
  font-feature-settings: "zero" 1;
  color: var(--ink);
}

/* ---- Stats band (readout, not caption) ---------------------------------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat {
  padding: var(--s-24) var(--s-24) var(--s-24) 0;
  border-left: 1px solid var(--hairline);
  padding-left: var(--s-24);
}
.stat:first-child {
  border-left: 0;
  padding-left: 0;
}
.stat__figure {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: var(--s-16);
}
.stat__label {
  color: var(--ink-mid);
}

/* ---- CTA band ----------------------------------------------------------- */
.cta {
  text-align: center;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}
.cta__title {
  margin: 0 0 var(--s-24);
}
.cta__sub {
  margin: 0 auto var(--s-40);
  max-width: 560px;
  color: var(--ink-soft);
}

/* ---- Page opener -------------------------------------------------------- */
.opener {
  background: var(--canvas);
}
.opener__eyebrow {
  color: var(--ink-mid);
  margin-bottom: var(--s-16);
}
.opener__title {
  margin: 0 0 var(--s-24);
}
.opener__lead {
  color: var(--ink-soft);
  margin: 0;
  max-width: 640px;
}
.opener--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: var(--s-64);
  align-items: center;
}
.opener__plate {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 1px solid var(--hairline-strong);
}

/* ---- Quickstart --------------------------------------------------------- */
.qs {
  border-top: 1px solid var(--hairline);
}
.qs__row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: var(--s-40);
  padding-block: var(--s-40);
  border-bottom: 1px solid var(--hairline);
  align-items: start;
}
.qs__num {
  color: var(--magenta);
}
.qs__row--plate {
  grid-template-columns: 88px minmax(0, 1fr) 300px;
}
.qs__plate {
  width: 300px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--hairline-strong);
}
.qs__title {
  margin: 0 0 var(--s-12);
}
.qs__copy {
  margin: 0;
  color: var(--ink-soft);
}
.qs__body {
  min-width: 0;
}

/* ---- Code block --------------------------------------------------------- */
.code-block {
  position: relative;
  background: var(--panel);
  border-radius: 4px;
  padding: var(--s-40);
  margin-top: var(--s-24);
  overflow-x: auto;
}
.code-block pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
  font-feature-settings: "zero" 1;
  white-space: pre;
}
.code-block .k {
  color: var(--cyan);
}
.code-block__copy {
  position: absolute;
  top: var(--s-16);
  right: var(--s-16);
}

/* ---- Spec table --------------------------------------------------------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}
.spec-table thead th {
  background: var(--panel-raised);
  color: var(--ink-mid);
  text-align: left;
  padding: var(--s-12) var(--s-16);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  font-feature-settings: "case" 1;
}
.spec-table td {
  padding: var(--s-12) var(--s-16);
  border-top: 1px solid var(--hairline);
  vertical-align: top;
}
.spec-table .col-param {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-feature-settings: "zero" 1;
  white-space: nowrap;
}
.spec-table .col-values {
  font-family: var(--font-mono);
  color: var(--ink);
  font-feature-settings: "zero" 1;
}
.spec-table .col-desc {
  color: var(--ink-soft);
  font-size: 14px;
}
.spec-table .col-tag {
  white-space: nowrap;
}
.table-scroll {
  overflow-x: auto;
}

/* ---- Spec strip (caching & limits / prices reuse the readout form) ------ */
.spec-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}
.spec-strip .stat {
  border-left: 1px solid var(--hairline);
  padding: var(--s-24);
}
.spec-strip .stat:first-child {
  border-left: 0;
  padding-left: 0;
}
.purge-row {
  display: flex;
  align-items: center;
  gap: var(--s-16);
  margin-top: var(--s-40);
  padding-top: var(--s-24);
  border-top: 1px solid var(--hairline);
  color: var(--ink-soft);
}

/* ---- Tier cards --------------------------------------------------------- */
.tiers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-24);
}
.tier {
  background: var(--panel);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: var(--s-40);
  display: flex;
  flex-direction: column;
  gap: var(--s-24);
}
.tier__name {
  margin: 0;
}
.tier__price {
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.tier__ledger {
  border-top: 1px solid var(--hairline);
  padding-top: var(--s-24);
  display: flex;
  flex-direction: column;
  gap: var(--s-12);
}
.ledger-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--s-16);
  align-items: baseline;
}
.ledger-row .label {
  color: var(--ink-mid);
  font-size: 14px;
}
.ledger-row .val {
  color: var(--ink);
  text-align: right;
  font-feature-settings: "tnum" 1;
  font-weight: 500;
  font-size: 15px;
}

/* ---- Overage / billing ledger ------------------------------------------- */
.billing {
  display: flex;
  flex-direction: column;
}
.billing__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--s-24);
  padding-block: var(--s-16);
  border-top: 1px solid var(--hairline);
  align-items: baseline;
}
.billing__row:first-child {
  border-top: 0;
}
.billing__label {
  color: var(--ink-soft);
}
.billing__val {
  color: var(--ink);
  font-feature-settings: "tnum" 1;
  font-weight: 500;
  text-align: right;
  max-width: 42ch;
}

/* ---- FAQ ---------------------------------------------------------------- */
.faq {
  border-top: 1px solid var(--hairline);
}
.faq__item {
  border-bottom: 1px solid var(--hairline);
}
.faq__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-24);
  width: 100%;
  background: none;
  border: 0;
  text-align: left;
  padding: var(--s-24) 0;
  color: var(--ink);
}
.faq__chevron {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border-radius: 0;
  background: var(--panel-raised);
  border: 0;
  color: var(--ink-mid);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.faq__chevron::before,
.faq__chevron::after {
  content: "";
  position: absolute;
  background: var(--ink-mid);
}
.faq__chevron::before {
  width: 12px;
  height: 2px;
}
.faq__chevron::after {
  width: 2px;
  height: 12px;
  transition: transform 120ms ease-out;
}
.faq__q[aria-expanded="true"] .faq__chevron::after {
  transform: scaleY(0);
}
.faq__a {
  color: var(--ink-soft);
  padding: 0 0 var(--s-24);
  max-width: 760px;
  margin: 0;
}
.faq__a[hidden] {
  display: none;
}

/* ---- Footer ------------------------------------------------------------- */
.footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding: var(--s-64) var(--s-24);
}
.footer__inner {
  max-width: var(--container);
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-64);
  justify-content: space-between;
}
.footer__col h4 {
  margin: 0 0 var(--s-16);
  color: var(--ink-mid);
}
.footer__col a {
  display: block;
  color: var(--ink-mid);
  font-size: 14px;
  padding-block: 4px;
}
.footer__col a:hover {
  color: var(--ink);
}
.footer__legal {
  max-width: var(--container);
  margin: var(--s-40) auto 0;
  padding-top: var(--s-24);
  border-top: 1px solid var(--hairline);
  color: var(--ink-dim);
}

/* ---- Section heads ------------------------------------------------------ */
.section-head {
  margin: 0 0 var(--s-40);
}
.section-head__over {
  color: var(--ink-mid);
  margin-bottom: var(--s-12);
}
.section-head__title {
  margin: 0;
}
.lede {
  color: var(--ink-soft);
  max-width: 680px;
}
.mt-24 {
  margin-top: var(--s-24);
}
.mt-40 {
  margin-top: var(--s-40);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

/* Tablet 640-1024: display 52, readout 64, panel beneath the stack. */
@media (max-width: 1024px) {
  .t-display-xxl {
    font-size: 52px;
  }
  .t-readout {
    font-size: 64px;
  }
  .hero__grid {
    /* minmax(0, 1fr) — not a plain 1fr — so the single column can never grow
       past the container to the min-content of the panel or the readouts.
       A plain 1fr floors the track at its widest child's min-content, which
       blew the stack + panel out to ~646px and clipped the 88px readouts. */
    grid-template-columns: minmax(0, 1fr);
    gap: var(--s-40);
  }
  .plane[data-plane="1"] {
    transform: rotateY(-14deg) rotateX(5deg) translateZ(0);
  }
  .plane[data-plane="2"] {
    transform: rotateY(-14deg) rotateX(5deg) translateZ(56px);
  }
  .plane[data-plane="3"] {
    transform: rotateY(-14deg) rotateX(5deg) translateZ(112px);
  }
  .plane[data-plane="4"] {
    transform: rotateY(-14deg) rotateX(5deg) translateZ(168px);
  }
  .cards {
    grid-template-columns: 1fr;
  }
  .tiers {
    grid-template-columns: 1fr;
  }
  .stats {
    grid-template-columns: 1fr 1fr;
  }
  .stat:nth-child(-n + 2) {
    border-top: 0;
  }
  .stat:nth-child(2n + 1) {
    border-left: 0;
    padding-left: 0;
  }
  .stat {
    border-top: 1px solid var(--hairline);
  }
  .opener--split {
    grid-template-columns: 1fr;
    gap: var(--s-40);
  }
  .opener__plate {
    max-width: 300px;
  }
  .qs__row--plate {
    grid-template-columns: 88px minmax(0, 1fr);
  }
  .qs__plate {
    display: none;
  }
}

/* Mobile <640: display 34, readout 88->48, stack un-tilts to flat plates. */
@media (max-width: 640px) {
  .band {
    padding-block: var(--s-64);
  }
  .t-display-xxl {
    font-size: 34px;
    letter-spacing: -0.5px;
  }
  .t-display-xl {
    font-size: 34px;
    letter-spacing: -0.5px;
  }
  .t-readout {
    font-size: 48px;
    letter-spacing: -1px;
  }
  /* Overage ledger: at phone width the label/value side-by-side split
     crushes long labels to one word per line, so stack each row —
     label above its value, both left-aligned. */
  .billing__row {
    grid-template-columns: 1fr;
    gap: var(--s-4);
  }
  .billing__val {
    text-align: left;
    max-width: none;
  }
  .nav__tabs {
    gap: var(--s-16);
    margin-left: var(--s-8);
  }
  .nav__inner {
    gap: var(--s-12);
  }
  /* The header CTA collapses on mobile: its "Start building" action is
     repeated in the page body (the index CTA band and every pricing tier
     card), so the bar keeps only its three type-only tabs, which stay
     reachable inline beside the wordmark. A hamburger is declined on
     purpose — this system forbids icons, and its own rule is that the tabs
     are type only, so a menu glyph would be the one drawn mark on the page. */
  .nav .btn--primary {
    display: none;
  }
  .panel {
    padding: var(--s-24);
  }
  /* The stack un-tilts into four flat plates stacked vertically. */
  .stage {
    flex-direction: column;
  }
  .stack-scene {
    height: auto;
    perspective: none;
  }
  .stack-inner {
    position: static;
    transform-style: flat;
    display: flex;
    flex-direction: column;
    gap: var(--s-24);
  }
  .plane,
  .plane[data-plane="1"],
  .plane[data-plane="2"],
  .plane[data-plane="3"],
  .plane[data-plane="4"],
  .stack-inner.is-flat .plane {
    position: relative;
    left: auto;
    top: auto;
    margin: 0;
    width: 100%;
    max-width: 320px;
    height: auto;
    aspect-ratio: 4 / 3;
    transform: none;
  }
  .connectors {
    display: none;
  }
  .plane-readouts {
    flex-basis: auto;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--s-24);
  }
  .stats {
    grid-template-columns: 1fr;
  }
  .stat {
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid var(--hairline);
  }
  .stat:first-child {
    border-top: 0;
  }
  .spec-strip {
    grid-template-columns: 1fr;
  }
  .spec-strip .stat {
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid var(--hairline);
  }
  .spec-strip .stat:first-child {
    border-top: 0;
  }
  .demo {
    grid-template-columns: 1fr;
  }
  .strip {
    grid-template-columns: 12px 48px minmax(0, 1fr) 72px;
    gap: var(--s-8);
  }
  .qs__row {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: var(--s-16);
  }
}

/* Reduced motion: stack renders already exploded; drop every transition. */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
  .plane {
    transition: none !important;
  }
}