/**
 * site.css — components.
 *
 * Section rhythm: dark hero → light story → light community → dark call to
 * action → dark footer. The dark panels carry the logo's star field, so the
 * page and the mark are visibly the same object.
 */

/* ================================================================ panels */

.panel--dark {
  position: relative;
  background: var(--bg-dark);
  color: var(--ink-on-dark);
  isolation: isolate;
}
.panel--dark::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('../assets/stars.svg') repeat;
  background-size: 460px 460px;
  opacity: 0.5;
  z-index: -3;
  pointer-events: none;
}
.panel--dark.has-sky::before { display: none; }   /* sky.js draws the stars */
.panel--dark > .sky {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -3;
  pointer-events: none;
}
.panel--dark::after {
  /* A soft warm limb in the lower right: the lit edge of the logo's globe. */
  content: '';
  position: absolute;
  inset: 0;
  /* sky.js moves this with the sun; the defaults are the dawn look. */
  background: radial-gradient(120% 90% at var(--sun-x, 100%) var(--sun-y, 108%),
              rgba(239, 127, 27, var(--sun-glow, 0.30)), rgba(239, 127, 27, 0) 62%);
  z-index: -2;
  pointer-events: none;
}

/* The logo's skyline, on the same horizon the sun rises over: stars and sun
   are drawn behind it (z-index -3 and -2), the panel's text in front. Panels
   that carry it reserve --skyline-h of empty sky at the bottom, so nothing is
   ever set over the buildings. */
.panel--dark > .skyline {
  position: absolute;
  inset: auto 0 0 0;
  height: var(--skyline-h, 0);
  background:
    url('../assets/skyline.svg') no-repeat bottom right / auto 100%,
    linear-gradient(to right, rgba(255, 255, 255, 0), rgba(255, 255, 255, 0.3) 60%)
      no-repeat left bottom / 100% 2px;
  opacity: 0.92;
  z-index: -1;
  pointer-events: none;
}
.hero, .cta { --skyline-h: clamp(8rem, 30vw, 30rem); }
.panel--dark h1, .panel--dark h2, .panel--dark h3 { color: var(--white); }
.panel--dark .lede { color: var(--ink-on-dark-mut); }
.panel--dark .eyebrow { color: var(--ink-on-dark-mut); }
.panel--dark .eyebrow::after { background: var(--rule-on-dark); }
.panel--dark a { text-decoration-color: rgba(253, 197, 13, 0.55); }
.panel--dark a:hover { color: var(--amber); }

/* ================================================================ header */

:root { --header-h: 4.25rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--navy-deeper) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--rule-on-dark);
  color: var(--ink-on-dark);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-m);
  min-height: var(--header-h);
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--white);
  margin-right: auto;
}
/* The full logo, so the skyline and wordmark still read; the favicon is
   the plain mark, which is all that survives 16px. */
.brand__mark { width: auto; height: 2.6rem; border-radius: 2px; flex: none; }
.brand__name {
  font-weight: 700;
  font-size: 1.06rem;
  letter-spacing: -0.015em;
  line-height: 1;
}
.brand__sub {
  display: block;
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-on-dark-mut);
  margin-top: 0.22em;
}
.site-nav { display: flex; align-items: center; gap: var(--space-m); }
.site-nav a {
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--ink-on-dark-mut);
}
.site-nav a:hover { color: var(--white); }
@media (max-width: 640px) {
  .brand__sub { display: none; }
  .site-nav .site-nav__hide-sm { display: none; }
}

/* ================================================================== hero */

.hero { padding-block: clamp(3.5rem, 9vw, 7rem) calc(var(--space-xl) + var(--skyline-h)); }
.hero__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  align-items: end;
}
@media (max-width: 900px) { .hero__grid { align-items: start; } }
@media (max-width: 900px) { .hero__grid { grid-template-columns: 1fr; } }

.hero h1 { max-width: 16ch; }
.hero__cycle {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.75rem;
  margin: var(--space-l) 0 0;
  padding: 0;
  list-style: none;
  font-size: var(--step--1);
  font-weight: 650;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.hero__cycle li { margin: 0; color: var(--ink-on-dark-mut); display: flex; gap: 0.75rem; }
.hero__cycle li::after { content: '→'; color: var(--orange); }
.hero__cycle li:last-child::after { content: '↻'; }

.hero__join { max-width: 34rem; }
.hero__join p { color: var(--ink-on-dark-mut); margin: 0 0 var(--space-m); }

/* ================================================================== form */

.signup { max-width: 34rem; }
.signup__fields { display: grid; gap: var(--space-m); }
.signup__field { min-width: 0; }
.signup__submit { margin-top: var(--space-l); }
.signup__submit .btn { min-height: 3rem; }
.signup label,
.signup legend {
  display: block;
  font-size: var(--step--1);
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-2xs);
}
.signup__optional { font-weight: 400; letter-spacing: 0.02em; text-transform: none; opacity: 0.8; }
.signup input[type='text'],
.signup input[type='email'] {
  width: 100%;
  font: inherit;
  font-size: var(--step-0);   /* >= 16px, so iOS does not zoom on focus */
  padding: 0.7rem 0.85rem;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
}
.panel--dark .signup input[type='text'],
.panel--dark .signup input[type='email'] {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(234, 241, 247, 0.34);
  color: var(--white);
}
.signup input[aria-invalid='true'] { border-color: var(--orange-deep); }

/* Data-partner question: secondary metadata, so smaller and quieter. */
.signup__choice {
  margin: var(--space-2xs) 0 0;
  padding: var(--space-m) 0 0;
  border: 0;
  border-top: 1px solid var(--rule-strong);
  min-width: 0;
}
.panel--dark .signup__choice { border-top-color: var(--rule-on-dark); }
.signup .signup__choice legend {
  float: left;               /* keeps the legend inside the fieldset's padding */
  width: 100%;
  font-size: var(--step--1);
  letter-spacing: 0.02em;
  text-transform: none;
  font-weight: 600;
  line-height: var(--leading-snug);
}
.signup__options { clear: both; display: grid; gap: 0.15rem; }
.signup .signup__option {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 2.75rem;       /* comfortable touch target */
  margin: 0;
  font-size: var(--step-0);
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  cursor: pointer;
}
.signup__option input {
  flex: none;
  width: 1.15rem;
  height: 1.15rem;
  margin: 0;
  accent-color: var(--orange);
}
.signup__hint { font-size: var(--step--1); color: var(--ink-faint); margin: var(--space-2xs) 0 0; }
.panel--dark .signup__hint { color: var(--ink-on-dark-mut); }

/* The honeypot. Hidden from sight, from the tab order and from screen
   readers — only an automated filler will ever put anything in it. */
.signup__trap {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  font: inherit;
  font-weight: 680;
  letter-spacing: 0.01em;
  padding: 0.72rem 1.35rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: var(--orange);
  color: #23130a;
  cursor: pointer;
  text-decoration: none;
  transition: background 160ms var(--ease-out), transform 120ms var(--ease-out);
}
.btn:hover { background: var(--amber); }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: 0.6; cursor: default; }
.btn--ghost {
  background: transparent;
  border-color: var(--rule-strong);
  color: var(--ink);
}
.panel--dark .btn--ghost { border-color: rgba(234, 241, 247, 0.4); color: var(--white); }
.btn--ghost:hover { background: rgba(239, 127, 27, 0.12); }

.signup__status {
  display: block;
  margin-top: var(--space-xs);
  font-size: var(--step--1);
  min-height: 1.4em;
  color: var(--ink-muted);
}
.panel--dark .signup__status { color: var(--ink-on-dark-mut); }
.signup[data-state='error'] .signup__status,
.signup[data-state='invalid'] .signup__status { color: var(--orange); font-weight: 600; }
.signup[data-state='submitted'] .signup__status { color: var(--amber); font-weight: 600; }
.panel:not(.panel--dark) .signup__status { color: var(--ink-muted); }
.panel:not(.panel--dark) .signup[data-state='error'] .signup__status,
.panel:not(.panel--dark) .signup[data-state='invalid'] .signup__status,
.panel:not(.panel--dark) .signup[data-state='submitted'] .signup__status { color: var(--orange-text); }

.signup__note { font-size: var(--step--1); color: var(--ink-faint); margin-top: var(--space-xs); }
.panel--dark .signup__note { color: var(--ink-on-dark-mut); }

/* ================================================================= story */

.story { position: relative; background: var(--paper); }
.story__intro { padding-block: var(--space-2xl) var(--space-l); }

.story__layout {
  display: grid;
  grid-template-columns: minmax(0, 58fr) minmax(0, 42fr);
  gap: clamp(1rem, 4vw, 3.5rem);
  align-items: start;
}

/* ---- the sticky figure ---- */
.story__viz {
  position: sticky;
  top: var(--header-h);
  height: calc(100svh - var(--header-h));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  z-index: 1;
}
.story__viz svg {
  width: 100%;
  max-width: min(100%, 82vh);
  aspect-ratio: 1;
  height: auto;
  overflow: visible;   /* the viewBox already carries a margin */
}

.story__meta {
  position: absolute;
  top: clamp(0.5rem, 3vh, 2rem);
  left: 0;
  display: flex;
  align-items: center;
  gap: var(--space-s);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}
.story__bar {
  --story-progress: 0;
  width: clamp(4rem, 12vw, 9rem);
  height: 2px;
  background: var(--rule);
  position: relative;
}
.story__bar::after {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: calc(var(--story-progress) * 100%);
  background: var(--orange);
}

/* ---- the steps ---- */
.story__steps { position: relative; z-index: 2; }
.step {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: var(--space-xl);
}
.step__index {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
  margin-bottom: var(--space-xs);
  display: block;
}
.step h2 { font-size: var(--step-2); max-width: 20ch; }
.step p { color: var(--ink-muted); max-width: 46ch; }
.step__card {
  border-left: 2px solid var(--rule);
  padding-left: clamp(1rem, 2.5vw, 1.75rem);
  transition: border-color 420ms var(--ease-out), opacity 420ms var(--ease-out);
  opacity: 0.44;
}
.js .step.is-active .step__card { opacity: 1; border-left-color: var(--orange); }
.no-js .step__card { opacity: 1; }

.step__tags {
  list-style: none;
  padding: 0;
  margin: var(--space-m) 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xs);
}
.step__tags li {
  margin: 0;
  font-size: 0.72rem;
  font-weight: 620;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
}

.story__outro {
  padding-block: var(--space-2xl) var(--space-3xl);
  text-align: center;
}
.story__outro p {
  margin-inline: auto;
  font-size: var(--step-2);
  font-weight: 620;
  letter-spacing: -0.015em;
  color: var(--ink);
  max-width: 24ch;
  line-height: 1.25;
}
.story__outro .accent { color: var(--orange-deep); }

/* ---- the diagram itself ---- */
.sg-agent { shape-rendering: geometricPrecision; }
.sg-link {
  fill: none;
  stroke: var(--navy);
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}
.sg-coast-wrap { pointer-events: none; }
.sg-coast {
  fill: none;
  stroke: var(--navy);
  stroke-width: 0.35;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}
.sg-card__body { fill: none; stroke: var(--navy); stroke-width: 0.3; vector-effect: non-scaling-stroke; }
.sg-rule { stroke: var(--navy); stroke-width: 0.22; opacity: 0.35; vector-effect: non-scaling-stroke; }
.sg-rule--axis { stroke-dasharray: 1 1.4; opacity: 0.55; }
.sg-whisker { stroke: var(--navy); stroke-width: 0.24; opacity: 0.4; vector-effect: non-scaling-stroke; }
.sg-core { fill: var(--amber); stroke: var(--navy-deep); stroke-width: 0.12; vector-effect: non-scaling-stroke; }
.sg-ring__track { fill: none; stroke: var(--navy); stroke-width: 0.18; opacity: 0.16; vector-effect: non-scaling-stroke; }
.sg-ring__arc   { fill: none; stroke: var(--orange); stroke-width: 0.34; opacity: 0.6; vector-effect: non-scaling-stroke; stroke-linecap: round; }
.sg-ring__head  { fill: var(--orange); }
.sg-label {
  font-family: var(--font-sans);
  fill: var(--navy);
  font-size: 2.1px;
  font-weight: 620;
  letter-spacing: 0.02px;
}
.sg-label--row { font-size: 2.2px; opacity: 0.72; }
.sg-label--aside {
  font-size: 2.5px;
  font-weight: 500;
  opacity: 0.68;
  font-style: italic;
}

/* ---- mobile ----------------------------------------------------------
   The figure caps the screen and the text runs underneath it. The step's own
   top padding matches the figure's height, so when the scroll director centres
   a step its text lands in the band *below* the figure rather than behind it.
   Change --viz-h and the text follows automatically. */
@media (max-width: 860px) {
  .story { --viz-h: 42svh; }
  .story__layout { grid-template-columns: 1fr; gap: 0; }

  .story__viz {
    top: var(--header-h);
    height: var(--viz-h);
    padding: 0.4rem 0 0.9rem;
    background: var(--paper);   /* opaque: the text must pass behind it */
    z-index: 3;
  }
  .story__viz svg { width: auto; height: 100%; max-width: 100%; }
  /* A soft edge just below the figure, so text does not appear to be sliced. */
  .story__viz::after {
    content: '';
    position: absolute;
    left: 0; right: 0; bottom: -1.6rem;
    height: 1.6rem;
    background: linear-gradient(to bottom, var(--paper), rgba(250, 249, 247, 0));
    pointer-events: none;
  }

  /* The counter becomes a hairline across the foot of the figure. */
  .story__meta { top: auto; bottom: 0; left: 0; right: 0; gap: var(--space-2xs); }
  .story__bar { flex: 1; }

  .step {
    min-height: 100svh;
    justify-content: center;
    padding-top: calc(var(--viz-h) + var(--space-m));
    padding-bottom: var(--space-m);
  }
  .step h2 { font-size: var(--step-1); max-width: none; }
  .step p { max-width: none; }
  .step__tags li { font-size: 0.66rem; }
}

/* Reduced motion: the figure stops being sticky, so nothing moves under the
   reader. Each scene is simply shown once, beside its own text. */
@media (prefers-reduced-motion: reduce) {
  .story__layout { grid-template-columns: 1fr; }
  .story__viz { position: static; height: auto; padding: 0; }
  .story__viz::after { display: none; }
  .story__viz svg { width: 100%; height: auto; max-width: min(100%, 60svh); margin-inline: auto; }
  .story__meta { position: static; justify-content: center; margin-top: var(--space-s); }
  .step { min-height: 0; padding-block: var(--space-l); }
  .step__card { opacity: 1; }
}

/* Without JavaScript the diagram is empty, so hide it and let the prose run
   as an ordinary article. */
.no-js .story__viz { display: none; }
.no-js .story__layout { grid-template-columns: 1fr; }
.no-js .step { min-height: 0; padding-block: var(--space-l); }
.no-js .story__meta { display: none; }

/* ============================================================= community */

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
  gap: clamp(1.5rem, 5vw, 4.5rem);
  align-items: start;
}
@media (max-width: 820px) { .split { grid-template-columns: 1fr; } }

.members {
  list-style: none;
  padding: 0;
  margin: 0;
  columns: 2;
  column-gap: var(--space-l);
}
.members li {
  break-inside: avoid;
  margin-bottom: var(--space-xs);
  padding-left: 1.1rem;
  position: relative;
  color: var(--ink-muted);
}
.members li::before {
  content: '';
  position: absolute;
  left: 0; top: 0.62em;
  width: 6px; height: 6px;
  border-radius: 1px;
  background: var(--orange);
}
@media (max-width: 560px) { .members { columns: 1; } }

.principles {
  list-style: none;
  padding: 0;
  margin: var(--space-xl) 0 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border-block: 1px solid var(--rule);
  grid-template-columns: repeat(auto-fit, minmax(20rem, 1fr));
}
.principles > li {
  margin: 0;
  background: var(--paper);
  padding: var(--space-l) var(--space-m) var(--space-l) 0;
  padding-right: var(--space-l);
}
.principles h3 {
  display: flex;
  align-items: baseline;
  gap: 0.6em;
  margin-bottom: var(--space-2xs);
}
.principles h3::before {
  content: counter(principle, decimal-leading-zero);
  counter-increment: principle;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--orange-text);
}
.principles { counter-reset: principle; }
.principles p { color: var(--ink-muted); font-size: var(--step-0); }
@media (min-width: 40rem) {
  .principles > li { padding-left: var(--space-l); }
}

/* =================================================================== CTA */

.cta { padding-block: var(--space-3xl) calc(var(--space-xl) + var(--skyline-h)); }
.cta__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}
@media (max-width: 860px) { .cta__grid { grid-template-columns: 1fr; } }

.linklist { list-style: none; padding: 0; margin: 0; }
.linklist li { margin: 0; border-top: 1px solid var(--rule-on-dark); }
.linklist li:last-child { border-bottom: 1px solid var(--rule-on-dark); }
.linklist a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-s);
  padding: var(--space-s) 0;
  text-decoration: none;
  font-weight: 620;
  color: var(--ink-on-dark);
}
.linklist a span.desc {
  font-weight: 400;
  font-size: var(--step--1);
  color: var(--ink-on-dark-mut);
  text-align: right;
}
.linklist a:hover { color: var(--amber); }
.linklist a::after { content: '→'; color: var(--orange); flex: none; }
a.is-unconfigured {
  cursor: default;
  opacity: 0.45;
}
a.is-unconfigured:hover { color: inherit; }
.linklist a.is-unconfigured::after { content: '·'; }

/* ================================================================ footer */

.site-footer {
  background: var(--navy-deeper);
  color: var(--ink-on-dark-mut);
  padding-block: var(--space-xl);
  font-size: var(--step--1);
  border-top: 1px solid var(--rule-on-dark);
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-m);
  align-items: center;
  justify-content: space-between;
}
.site-footer p { margin: 0; max-width: 52ch; }
.site-footer a { color: var(--ink-on-dark); }