/* Ukaia stylesheet.
   Layout: a drafting sheet with a hairline grid. The home page is a hub: one dark plate
   with linked cards set around it. The palette is hue 198, six tokens, defined on :root only. */

:root {
  --paper: #f2f8fa;
  --tint: #d5e8f0;
  --line: #7fa7b8;
  --ink-soft: #3e6271;
  --ink: #0e2630;
  --accent: #0a658c;

  --font: -apple-system, "Helvetica Neue", Arial, sans-serif;
  --gutter: 16px;
  --wide: 72rem;
  --measure: 44rem;
  --gap: 3rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 5rem;
  color-scheme: light;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, var(--tint) 1px, var(--paper) 1px),
    linear-gradient(to bottom, var(--tint) 1px, var(--paper) 1px);
  background-size: 48px 48px;
  color: var(--ink);
  font-family: var(--font);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  line-height: 1.6;
  overflow-wrap: break-word;
}

img,
svg,
canvas {
  max-width: 100%;
}

h1,
h2,
h3 {
  margin: 0 0 0.75em;
  color: var(--ink);
  font-family: var(--font);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.12;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2rem, 1.3rem + 2.8vw, 3.5rem);
}

h2 {
  margin-top: 2.25em;
  font-size: clamp(1.45rem, 1.15rem + 1.1vw, 2.1rem);
}

h3 {
  font-size: clamp(1.15rem, 1rem + 0.5vw, 1.4rem);
}

p {
  margin: 0 0 1em;
  max-width: 66ch;
}

ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.25em;
  max-width: 66ch;
}

li + li {
  margin-top: 0.4em;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--ink);
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

main:focus {
  outline: none;
}

.skip-link {
  position: absolute;
  top: -4rem;
  left: var(--gutter);
  z-index: 10;
  padding: 0.75rem 1rem;
  background-color: var(--ink);
  color: var(--paper);
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  top: 0.75rem;
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.wrap {
  width: 100%;
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* Header and navigation */

.site-header {
  background-color: var(--paper);
  border-bottom: 1.5px solid var(--ink-soft);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem 1.5rem;
  padding-top: 0.4rem;
  padding-bottom: 0.4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 44px;
  color: var(--ink);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
}

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

.brand-mark {
  flex: none;
  width: 2rem;
  height: 2rem;
}

.mark-rod {
  fill: none;
  stroke: var(--ink);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.mark-pivot,
.mark-bob-a {
  fill: var(--ink);
}

.mark-bob-b {
  fill: var(--accent);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
  max-width: none;
}

.nav-list li + li {
  margin-top: 0;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--paper);
}

.nav-list a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.nav-list a[aria-current="page"] {
  font-weight: 700;
  border-bottom-color: var(--ink);
}

/* Home page hub: central plate with spokes */

main {
  display: block;
  padding: 2rem 0 4rem;
}

.hub-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "hub"
    "studies"
    "guide"
    "about"
    "contact";
}

.hub {
  grid-area: hub;
}

.spoke-studies {
  grid-area: studies;
}

.spoke-guide {
  grid-area: guide;
}

.spoke-about {
  grid-area: about;
}

.spoke-contact {
  grid-area: contact;
}

@media (min-width: 960px) {
  main {
    padding: 3rem 0 5rem;
  }

  .hub-grid {
    gap: var(--gap);
    align-items: center;
    grid-template-columns: minmax(12rem, 1fr) minmax(0, 2.2fr) minmax(12rem, 1fr);
    grid-template-areas:
      ". studies ."
      "guide hub about"
      ". contact .";
  }
}

.hub {
  min-width: 0;
  padding: clamp(1.25rem, 1rem + 1.6vw, 2.75rem);
  background-color: var(--ink);
  color: var(--paper);
}

.hub h1,
.hub h2 {
  color: var(--paper);
}

.hub h2 {
  margin-top: 1.9rem;
  font-size: clamp(1.15rem, 1rem + 0.6vw, 1.5rem);
}

.hub a {
  color: var(--paper);
}

.hub a:hover {
  color: var(--tint);
}

.hub :focus-visible {
  outline-color: var(--paper);
}

.eyebrow {
  margin: 0 0 1rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.hub .eyebrow {
  color: var(--line);
}

.lede {
  font-size: clamp(1.05rem, 0.98rem + 0.45vw, 1.3rem);
  line-height: 1.5;
  color: var(--paper);
}

.plate {
  margin: 0;
}

.live-plate,
.static-plate {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  background-color: var(--paper);
}

.plate-caption {
  max-width: none;
  margin: 0.9rem 0 0;
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--line);
}

.no-js-note {
  display: none;
  max-width: none;
  margin: 1.25rem 0 0;
  color: var(--paper);
}

.controls {
  display: grid;
  gap: 1.1rem;
  min-width: 0;
  margin: 1.5rem 0 0;
  padding: 1.1rem 1rem 1.25rem;
  border: 1.5px solid var(--line);
}

.controls legend {
  padding: 0 0.4rem;
  font-weight: 700;
  color: var(--paper);
}

.field {
  margin: 0;
}

.field-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.25rem 1rem;
  margin-bottom: 0.25rem;
}

.field-row label,
.check label {
  font-weight: 700;
}

output {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  display: block;
  width: 100%;
  min-height: 44px;
  margin: 0;
  accent-color: var(--paper);
}

.hint {
  max-width: none;
  margin: 0;
  font-size: 0.9rem;
  color: var(--line);
}

.check {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.check input {
  flex: none;
  width: 1.35rem;
  height: 1.35rem;
  margin: 0.15rem 0 0;
  accent-color: var(--paper);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 0.5rem 1.15rem;
  font: inherit;
  font-weight: 700;
  color: var(--ink);
  background-color: var(--paper);
  border: 1.5px solid var(--ink-soft);
  border-radius: 0;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  color: var(--ink);
  background-color: var(--tint);
}

.btn-primary {
  color: var(--paper);
  background-color: var(--accent);
  border-color: var(--accent);
}

.btn-primary:hover {
  color: var(--paper);
  background-color: var(--ink);
  border-color: var(--ink);
}

.hub .btn {
  color: var(--paper);
  background-color: var(--ink);
  border-color: var(--line);
}

.hub .btn:hover {
  color: var(--ink);
  background-color: var(--tint);
  border-color: var(--tint);
}

.hub .btn-primary {
  color: var(--ink);
  background-color: var(--paper);
  border-color: var(--paper);
}

.hub .btn-primary:hover {
  color: var(--ink);
  background-color: var(--tint);
  border-color: var(--tint);
}

.readout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
  gap: 0.75rem 1.5rem;
  margin: 1.25rem 0 0;
}

.readout > div {
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
}

.readout dt {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--line);
}

.readout dd {
  margin: 0.2rem 0 0;
  font-size: 1.05rem;
}

.status {
  min-height: 1.6em;
  max-width: none;
  margin: 1rem 0 0;
  font-weight: 700;
  color: var(--paper);
}

/* Spokes: linked cards around the hub */

.spoke {
  position: relative;
  min-width: 0;
  padding: 1.25rem 1.25rem 1.2rem;
  background-color: var(--paper);
  border: 1.5px solid var(--ink-soft);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.spoke:hover {
  background-color: var(--tint);
  border-color: var(--accent);
}

.spoke:has(a:focus-visible) {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.spoke-label {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.spoke h2 {
  margin: 0 0 0.45rem;
  font-size: clamp(1.3rem, 1.1rem + 0.7vw, 1.7rem);
}

.spoke h2 a {
  color: var(--ink);
  text-decoration: none;
}

.spoke h2 a:hover {
  color: var(--accent);
}

.spoke h2 a::after {
  content: "";
  position: absolute;
  inset: 0;
}

.spoke p {
  max-width: none;
  margin: 0;
  font-size: 0.98rem;
  color: var(--ink-soft);
}

.spoke::after {
  content: "";
  position: absolute;
  display: none;
  background-color: var(--ink-soft);
}

@media (min-width: 960px) {
  .spoke::after {
    display: block;
  }

  .spoke-studies::after {
    left: 50%;
    top: 100%;
    width: 1.5px;
    height: var(--gap);
    margin-left: -0.75px;
    transform-origin: 50% 0;
  }

  .spoke-contact::after {
    left: 50%;
    bottom: 100%;
    width: 1.5px;
    height: var(--gap);
    margin-left: -0.75px;
    transform-origin: 50% 100%;
  }

  .spoke-guide::after {
    top: 50%;
    left: 100%;
    width: var(--gap);
    height: 1.5px;
    margin-top: -0.75px;
    transform-origin: 0 50%;
  }

  .spoke-about::after {
    top: 50%;
    right: 100%;
    width: var(--gap);
    height: 1.5px;
    margin-top: -0.75px;
    transform-origin: 100% 50%;
  }
}

/* Inner pages */

.page-head {
  margin: 0 0 2.5rem;
  padding: 1.5rem 0 2rem;
  border-bottom: 1.5px solid var(--ink-soft);
}

.page-head h1 {
  margin-bottom: 0.6em;
}

.lead {
  font-size: clamp(1.1rem, 1rem + 0.45vw, 1.3rem);
  line-height: 1.5;
  color: var(--ink-soft);
}

.prose {
  max-width: var(--measure);
}

.prose > h2:first-child {
  margin-top: 0;
}

.study {
  max-width: var(--measure);
  margin: 0 0 2.25rem;
  padding: 1.5rem 1.4rem 1.6rem;
  background-color: var(--paper);
  border: 1.5px solid var(--ink-soft);
}

.study-num {
  margin: 0 0 0.4rem;
  font-size: clamp(2.2rem, 1.8rem + 1.6vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.study h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.3rem, 1.1rem + 0.8vw, 1.8rem);
}

.question {
  max-width: none;
  margin: 1.25rem 0 0;
  padding: 0.9rem 1rem;
  background-color: var(--tint);
  border-left: 4px solid var(--accent);
  color: var(--ink);
}

.note {
  max-width: none;
  margin: 2rem 0 0;
  padding: 1rem 1.2rem;
  background-color: var(--tint);
  border-left: 4px solid var(--ink);
}

.toc {
  max-width: var(--measure);
  margin: 0 0 2.5rem;
  padding: 1rem 1.2rem 1.1rem;
  background-color: var(--tint);
}

.toc-title {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
}

.toc ol {
  margin: 0;
  padding-left: 1.3rem;
}

.toc li + li {
  margin-top: 0.3rem;
}

.figure {
  max-width: 30rem;
  margin: 1.5rem 0 2rem;
}

.diagram {
  display: block;
  width: 100%;
  height: auto;
  background-color: var(--paper);
  border: 1.5px solid var(--ink-soft);
}

.figure figcaption {
  max-width: none;
  margin-top: 0.7rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.plate-bg {
  fill: var(--paper);
}

.reach {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
  stroke-dasharray: 4 6;
}

.rod {
  fill: none;
  stroke: var(--ink);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.pivot,
.bob-a {
  fill: var(--ink);
}

.bob-b {
  fill: var(--accent);
}

.ref {
  fill: none;
  stroke: var(--ink-soft);
  stroke-width: 1.5;
  stroke-dasharray: 3 4;
}

.arc {
  fill: none;
  stroke: var(--ink-soft);
  stroke-width: 1.5;
}

.svg-label {
  fill: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  font-weight: 700;
}

/* Site footer */

.site-footer {
  padding: 2rem 0 2.5rem;
  background-color: var(--paper);
  border-top: 1.5px solid var(--ink-soft);
}

.footer-inner p {
  max-width: none;
  margin: 0 0 0.6rem;
  color: var(--ink-soft);
}

.footer-inner .footer-brand {
  color: var(--ink);
  font-size: 1.2rem;
  font-weight: 700;
}

.footer-inner .nav-list {
  margin-top: 0.4rem;
}

/* Scripts off: show the static drawing and text, hide the live controls */

.no-js .live-plate,
.no-js .controls,
.no-js .readout,
.no-js .status {
  display: none;
}

.js .static-plate {
  display: none;
}

.no-js .no-js-note {
  display: block;
}

/* Motion: connectors draw in on wide screens; reduced motion gets the static layout */

@keyframes draw-x {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

@keyframes draw-y {
  from {
    transform: scaleY(0);
  }
  to {
    transform: scaleY(1);
  }
}

@media (min-width: 960px) and (prefers-reduced-motion: no-preference) {
  .spoke-studies::after,
  .spoke-contact::after {
    animation: draw-y 0.6s ease-out both;
  }

  .spoke-guide::after,
  .spoke-about::after {
    animation: draw-x 0.6s ease-out both;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}