/* A field observatory for one continuous Solar Explorer world. */

:root {
  --void: #000000;
  --deep: #070D18;
  --gold: #FFB84A;
  --cyan: #7BE7FF;
  --white: #ECF4FF;
  --amber: #D99A43;
  --violet: #AFA7FF;
  --dim: #7C8BA6;
  --dimmer: #4A5875;
  --rule: rgba(123, 231, 255, .16);
  --rule-soft: rgba(236, 244, 255, .09);
  --display: "Bahnschrift SemiCondensed", "Bahnschrift", "Arial Narrow", sans-serif;
  --body: "Segoe UI Variable", "Segoe UI", system-ui, sans-serif;
  --mono: "Cascadia Mono", "Consolas", ui-monospace, monospace;
  --gutter: clamp(1.25rem, 4vw, 4.5rem);
  --rail-width: 11.5rem;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --station-count: 7;
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
:root[data-motion="reduced"] { scroll-behavior: auto; }

body {
  margin: 0;
  overflow-x: clip;
  background: var(--void);
  color: var(--white);
  font: clamp(1rem, .96rem + .2vw, 1.075rem)/1.6 var(--body);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--cyan); text-decoration-thickness: 1px; text-underline-offset: .2em; }
a:hover { color: var(--white); }
code { padding: .1em .35em; border-radius: 2px; background: rgba(123, 231, 255, .07); color: var(--cyan); font: .9em var(--mono); }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 2px; }

.skip {
  position: absolute;
  top: -100vh;
  left: var(--gutter);
  z-index: 10;
  padding: .75rem 1.25rem;
  border-radius: 2px;
  background: var(--cyan);
  color: var(--void);
  font: 600 .875rem/1 var(--body);
}
.skip:focus { top: 1rem; }

/* The renderer remains the atmosphere; interface layers never wash the viewport. */
.stage-wrap {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}
#stage { display: block; width: 100%; height: 100%; }
.stage-fallback { position: absolute; inset: 0; display: grid; place-items: center; overflow: hidden; }
.stage-fallback img { width: 100%; height: 100%; object-fit: cover; opacity: .55; }
.stage-wrap:has(.stage-fallback) .world-labels { display: none; }
.world-labels { position: absolute; inset: 0; z-index: 2; pointer-events: none; }
.world-label { position: absolute; top: var(--label-y); left: var(--label-x); opacity: var(--label-opacity, 0); pointer-events: none; transition: opacity 160ms linear, transform 160ms linear; }
.world-label[data-visible="false"] { opacity: 0; visibility: hidden; }
.world-label__leader { position: absolute; top: 0; left: 0; width: var(--leader-length); height: 1px; transform: rotate(var(--leader-angle)); transform-origin: 0 50%; background: currentColor; opacity: .62; }
.world-label__chip { position: absolute; top: var(--chip-y); left: var(--chip-x); display: grid; gap: .08rem; min-width: max-content; padding: .35rem .45rem; border: 1px solid currentColor; background: rgba(3, 7, 15, .88); color: var(--amber); font: .58rem/1.2 var(--mono); letter-spacing: .08em; text-transform: uppercase; transform: translate(-50%, -50%) scale(var(--label-scale, .82)); transform-origin: 50% 50%; }
.world-label__chip strong { color: var(--white); font-size: .66rem; }
.world-label__chip small, .world-label__chip i { color: currentColor; font: inherit; }
.world-label[data-provenance="real-data"] { color: var(--cyan); }
.world-label[data-provenance="derived"] .world-label__chip { border-style: dashed; }

.masthead {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 6;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem var(--gutter);
  border-bottom: 1px solid var(--rule-soft);
  background: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, .86) 55%, transparent 100%);
}
.wordmark { display: flex; align-items: center; gap: .6rem; margin: 0; color: var(--white); font: .7rem var(--mono); letter-spacing: .28em; }
.wordmark__dot { width: 6px; height: 6px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 3px rgba(255, 184, 74, .18); }
.masthead__controls { display: flex; gap: .5rem; }
.ctl, .cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  min-height: 44px;
  padding: .5rem .85rem;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: rgba(8, 16, 31, .7);
  color: var(--dim);
  font: .7rem var(--mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.ctl:hover, .cta:hover { border-color: rgba(123, 231, 255, .4); color: var(--white); }
.ctl[aria-pressed="true"] { border-color: var(--cyan); color: var(--cyan); }
.ctl__key { font-size: .9rem; line-height: 1; }
.cta { border-color: var(--gold); color: var(--gold); }
.cta:hover { border-color: var(--gold); background: var(--gold); color: var(--void); }

/* The rail is an actual logarithmic measurement instrument, not a progress decoration. */
.rail {
  --p: 0;
  position: fixed;
  top: 50%;
  right: var(--gutter);
  z-index: 5;
  width: var(--rail-width);
  transform: translateY(-50%);
  pointer-events: none;
}
.rail__readout { display: flex; align-items: baseline; gap: .4rem; font-family: var(--mono); }
.rail__value { color: var(--white); font-size: 1.75rem; letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
.rail__unit { color: var(--cyan); font-size: .8rem; letter-spacing: .1em; }
.rail__lt { margin: .15rem 0 1rem; color: var(--dim); font: .68rem var(--mono); }
.rail__track { position: relative; width: 100%; height: 15rem; border-left: 1px solid var(--rule); }
.rail__fill { position: absolute; top: 0; left: -1px; width: 1px; height: calc(var(--p) * 100%); background: linear-gradient(to bottom, var(--gold), var(--cyan)); }
.rail__cursor { position: absolute; top: calc(var(--p) * 100%); left: -4px; width: 7px; height: 7px; margin-top: -3.5px; border-radius: 50%; background: var(--white); box-shadow: 0 0 8px rgba(236, 244, 255, .6); }
.rail__tick { position: absolute; top: calc(var(--p) * 100%); left: 0; width: 7px; height: 1px; background: var(--rule); }
.rail__tick--anchor { width: 13px; background: rgba(123, 231, 255, .5); }
.rail__tick[data-kind="model"] { background: rgba(217, 154, 67, .6); }
.rail__tick[data-kind="schematic"] { background: rgba(124, 139, 166, .5); }
.rail__label { position: absolute; top: calc(var(--p) * 100%); left: 1.15rem; transform: translateY(-50%); color: var(--dimmer); font: .6rem var(--mono); letter-spacing: .06em; white-space: nowrap; }
.rail__label--near { color: var(--white); }
.rail__legend, .rail__stage { color: var(--dimmer); font: .6rem/1.4 var(--mono); text-transform: uppercase; }
.rail__legend { margin: .85rem 0 0; letter-spacing: .1em; }
.rail__stage { display: flex; flex-direction: column; align-items: flex-start; gap: .3rem; margin: .75rem 0 0; color: var(--dim); text-transform: none; }

.chip { display: inline-block; padding: .14em .5em; border: 1px solid currentColor; border-radius: 2px; font: 600 .58rem var(--mono); letter-spacing: .13em; text-transform: uppercase; white-space: nowrap; vertical-align: .12em; }
.chip[data-prov="measured"], .chip[data-prov="real-data"] { background: rgba(123, 231, 255, .1); color: var(--cyan); }
.chip[data-prov="catalog"] { color: var(--cyan); }
.chip[data-prov="model"] { background: rgba(217, 154, 67, .1); color: var(--amber); }
.chip[data-prov="schematic"] { border-style: dashed; color: var(--dim); }

/* Baseline remains a linear document when JavaScript or sticky viewport support is absent. */
.journey { position: relative; }
.experience-shell { min-height: 100svh; }
.story-deck { position: relative; z-index: 3; }
.story-panel {
  position: relative;
  display: grid;
  align-items: center;
  min-height: 100svh;
  padding: clamp(5.5rem, 11vh, 8rem) var(--gutter) clamp(7rem, 13vh, 9rem);
}

:root[data-experience="ready"] .journey { height: calc(var(--station-count) * 100svh); }
:root[data-experience="ready"] .experience-shell {
  position: sticky;
  top: 0;
  height: 100dvh;
  overflow: clip;
  isolation: isolate;
}
:root[data-experience="ready"] .story-deck { position: absolute; inset: 0; pointer-events: none; }
:root[data-experience="ready"] .story-panel {
  --presence: 0;
  --travel: 0;
  position: absolute;
  inset: 0;
  padding: clamp(5.5rem, 11vh, 8rem) var(--gutter) clamp(7rem, 13vh, 9rem);
  opacity: var(--presence);
  transform: translate3d(0, calc(var(--travel) * -1.5rem), 0);
  pointer-events: none;
}
:root[data-experience="ready"] .story-panel.is-active { pointer-events: auto; }
:root[data-experience="ready"] .story-panel[data-side="right"] { padding-inline-end: calc(var(--gutter) * 2 + var(--rail-width)); }

.story-panel__content { position: relative; z-index: 1; width: min(34rem, 44vw); }
.story-panel[data-side="right"] { justify-items: end; }
.story-panel[data-side="centre"] { justify-items: center; text-align: center; }
.story-panel__scrim {
  position: absolute;
  inset: 8% auto 8% 0;
  width: min(48rem, 62vw);
  background: radial-gradient(ellipse at 22% 50%, rgba(7, 13, 24, .92), rgba(7, 13, 24, .55) 45%, transparent 74%);
  pointer-events: none;
}
.story-panel[data-side="right"] .story-panel__scrim { inset-inline: auto 0; transform: scaleX(-1); }
.status { margin: 0 0 1rem; color: var(--dim); font: 600 .68rem/1.3 var(--mono); letter-spacing: .18em; text-transform: uppercase; }
.status__state { color: var(--cyan); }
.status__state--build { color: var(--violet); }
.status__state--next { color: var(--amber); }
h1, .story-panel h2 { margin: 0; font-family: var(--display); font-weight: 600; text-transform: uppercase; text-wrap: balance; }
h1 { color: var(--gold); font-size: clamp(2.5rem, 8.2vw, 7rem); line-height: .92; letter-spacing: -.015em; }
h1 em { color: var(--white); font-style: normal; }
.story-panel h2 { max-width: 13ch; font-size: clamp(2.4rem, 5.6vw, 5.8rem); line-height: .94; letter-spacing: -.025em; }
.story-panel .lede { max-width: 34rem; margin: 1.35rem 0 0; color: var(--white); line-height: 1.55; text-wrap: pretty; }
.evidence { max-width: 34rem; margin: 1.5rem 0 0; padding: 0; border-top: 1px solid var(--rule); list-style: none; }
.evidence li { display: grid; grid-template-columns: minmax(7.5rem, .8fr) 1.4fr; gap: 1rem; padding: .65rem 0; border-bottom: 1px solid var(--rule-soft); }
.evidence strong { color: var(--white); font: 600 .72rem/1.35 var(--mono); letter-spacing: .05em; text-transform: uppercase; }
.evidence span { color: var(--dim); font-size: .82rem; line-height: 1.4; }
.scroll-cue { display: flex; align-items: center; gap: .75rem; margin: 1.75rem 0 0; color: var(--dim); font: .65rem var(--mono); letter-spacing: .28em; text-transform: uppercase; }
.scroll-cue span { width: 3rem; height: 1px; background: linear-gradient(to right, var(--cyan), transparent); }
.final-actions { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1.5rem; }
.story-panel[data-side="centre"] .final-actions { justify-content: center; }

/* Task 2 gives the aperture a quiet instrument presence; Task 3 links it to renderer focus. */
.entity-aperture {
  --focus-x: 68vw;
  --focus-y: 46vh;
  --aim-x: 0;
  --aim-y: 0;
  position: absolute;
  top: var(--focus-y);
  left: var(--focus-x);
  z-index: 2;
  width: var(--focus-size, clamp(8rem, 13vw, 12rem));
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  pointer-events: none;
}
.entity-aperture__rings { width: 100%; height: 100%; overflow: visible; }
.entity-aperture__base, .entity-aperture__arc { fill: none; stroke-width: 1; vector-effect: non-scaling-stroke; }
.entity-aperture__base { stroke: rgba(236, 244, 255, .14); }
.entity-aperture__arc {
  --arc-index: 0;
  stroke: transparent;
  stroke-dasharray: 38 239;
  transform: rotate(calc(-90deg + var(--arc-index) * 60deg));
  transform-origin: 50% 50%;
  transition: stroke 220ms linear, opacity 220ms linear;
}
.entity-aperture__arc:nth-of-type(3) { --arc-index: 1; }
.entity-aperture__arc:nth-of-type(4) { --arc-index: 2; }
.entity-aperture__arc:nth-of-type(5) { --arc-index: 3; }
.entity-aperture__arc:nth-of-type(6) { --arc-index: 4; }
.entity-aperture__arc:nth-of-type(7) { --arc-index: 5; }
.entity-aperture__arc[data-state="live"] { stroke: var(--cyan); opacity: .9; }
.entity-aperture__arc[data-state="build"] { stroke: var(--violet); opacity: .78; }
.entity-aperture__arc[data-state="next"] { stroke: var(--amber); opacity: .68; }
.entity-aperture__arc[data-state="off"] { stroke: var(--rule-soft); opacity: .35; }
.entity-aperture::before { content: ""; position: absolute; top: 50%; left: 50%; width: .7rem; aspect-ratio: 1; border: 1px solid var(--white); border-radius: 50%; transform: translate(calc(-50% + var(--aim-x) * .35rem), calc(-50% + var(--aim-y) * .35rem)); transition: transform 220ms linear; }
.entity-aperture__focus { position: absolute; top: calc(50% + .8rem); left: 50%; margin: 0; transform: translate(-50%, -50%); color: var(--white); font: .62rem var(--mono); letter-spacing: .14em; text-transform: uppercase; white-space: nowrap; }

.station-nav {
  position: absolute;
  right: var(--gutter);
  bottom: max(1rem, env(safe-area-inset-bottom));
  left: var(--gutter);
  z-index: 6;
  display: grid;
  grid-template-columns: repeat(7, minmax(2.75rem, 1fr)) auto;
  align-items: end;
  gap: .35rem;
}
.station-nav__trace { position: absolute; top: .25rem; right: 4.5rem; left: 0; height: 1px; overflow: hidden; background: var(--rule-soft); }
.station-nav__trace span { display: block; width: 100%; height: 100%; transform: scaleX(0); transform-origin: left; background: var(--cyan); }
.station-nav__button { min-height: 44px; border: 0; border-top: 1px solid var(--rule); background: transparent; color: var(--dimmer); font: 600 .62rem/1 var(--mono); text-align: left; cursor: pointer; }
.station-nav__button[aria-current="step"] { border-color: var(--cyan); color: var(--white); }
.station-nav__count { margin: 0 0 .9rem .65rem; color: var(--dim); font: .7rem/1 var(--mono); }

.sources-dialog {
  width: min(70rem, calc(100vw - 2rem));
  max-height: min(48rem, calc(100dvh - 2rem));
  margin: auto;
  padding: clamp(1.25rem, 4vw, 3rem);
  border: 1px solid var(--rule);
  background: rgba(7, 13, 24, .98);
  color: var(--white);
}
.sources-dialog::backdrop { background: rgba(0, 0, 0, .82); backdrop-filter: blur(8px); }
.sources-dialog > form { position: sticky; top: 0; z-index: 1; display: flex; justify-content: end; }
.sources-dialog h2 { margin-top: 0; font: 600 clamp(2rem, 5vw, 4.5rem)/.95 var(--display); text-transform: uppercase; }
.sources-dialog h3 { margin: 2.5rem 0 .75rem; color: var(--cyan); font: 600 1.15rem var(--display); letter-spacing: .02em; text-transform: uppercase; }
.sources-dialog p, .sources-dialog li { color: var(--dim); }
.status-legend { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.status-legend div { padding-top: .75rem; border-top: 1px solid var(--rule); }
.status-legend dt { color: var(--cyan); font: 600 .72rem/1.2 var(--mono); text-transform: uppercase; }
.status-legend dd { margin: .5rem 0 0; color: var(--dim); }
.ledger { margin: 2.5rem 0 0; padding: 0; border-top: 1px solid var(--rule); list-style: none; counter-reset: ledger; }
.ledger li { display: grid; grid-template-columns: 2.75rem minmax(0, 1.15fr) minmax(0, .85fr); gap: .3rem 2.25rem; padding: 1.6rem 0 1.5rem; border-bottom: 1px solid var(--rule-soft); counter-increment: ledger; }
.ledger li::before { content: counter(ledger, decimal-leading-zero); grid-row: 1 / -1; color: var(--gold); font: .7rem var(--mono); letter-spacing: .08em; }
.ledger h3 { grid-column: 2; margin: 0; color: var(--white); font-size: 1.15rem; }
.ledger li > p:not(.ledger__limit):not(.ledger__ref) { grid-column: 2; margin: 0; }
.ledger__limit { grid-column: 3; grid-row: 1 / span 2; margin: 0; padding-left: 1rem; border-left: 1px solid rgba(217, 154, 67, .55); color: var(--amber) !important; font-size: .82rem; line-height: 1.5; }
.ledger__ref { grid-column: 2; margin: .55rem 0 0; color: var(--dimmer) !important; font: .62rem var(--mono); letter-spacing: .04em; overflow-wrap: anywhere; }
.source-fallback { position: relative; z-index: 3; margin: 100svh var(--gutter) 0; padding: 2rem 0; border-top: 1px solid var(--rule); }

@media (max-width: 60rem) {
  :root { --gutter: clamp(1rem, 5vw, 1.5rem); }
  .masthead { padding-block: max(.75rem, env(safe-area-inset-top)); }
  .masthead__controls #sources-open { display: none; }
  .rail { top: auto; right: 0; bottom: 0; left: 0; width: auto; transform: none; display: grid; grid-template-columns: auto 1fr; align-items: center; gap: .25rem .9rem; padding: .6rem var(--gutter) calc(.6rem + env(safe-area-inset-bottom)); border-top: 1px solid var(--rule); background: linear-gradient(to top, #000, rgba(0, 0, 0, .86)); }
  .rail__readout { grid-row: 1; }
  .rail__value { font-size: 1.15rem; }
  .rail__lt { grid-row: 2; grid-column: 1; margin: 0; }
  .rail__track { grid-row: 1 / span 2; grid-column: 2; width: 100%; height: 2px; border-top: 1px solid var(--rule); border-left: 0; }
  .rail__fill { top: -1px; left: 0; width: calc(var(--p) * 100%); height: 1px; background: linear-gradient(to right, var(--gold), var(--cyan)); }
  .rail__cursor { top: 50%; left: calc(var(--p) * 100%); margin-top: -3.5px; margin-left: -3.5px; }
  .rail__tick { top: 0; left: calc(var(--p) * 100%); width: 1px; height: 5px; }
  .rail__tick--anchor { width: 1px; height: 9px; }
  .rail__label, .rail__legend { display: none; }
  .rail__stage { grid-row: 3; grid-column: 1 / -1; flex-direction: row; align-items: center; margin-top: .35rem; padding-inline-end: 5rem; }
  :root[data-experience="ready"] .story-panel { align-items: end; padding: 42dvh var(--gutter) 7.25rem; }
  :root[data-experience="ready"] .story-panel[data-side="right"] { padding-inline-end: var(--gutter); }
  .story-panel__content { width: 100%; max-width: 36rem; }
  .story-panel__scrim { inset: 35dvh 0 4.5rem; width: 100%; background: linear-gradient(to bottom, transparent, rgba(7, 13, 24, .76) 16%, rgba(7, 13, 24, .96) 58%, var(--deep)); }
  .story-panel[data-side="right"] { justify-items: start; }
  .story-panel[data-side="right"] .story-panel__scrim { inset-inline: 0; transform: none; }
  .story-panel h2 { max-width: 14ch; font-size: clamp(2rem, 9vw, 3.4rem); }
  .story-panel .lede { margin-top: .85rem; font-size: .92rem; line-height: 1.45; }
  .evidence { margin-top: .9rem; }
  .evidence li { grid-template-columns: minmax(6.5rem, .8fr) 1.4fr; padding: .45rem 0; }
  .station-nav { grid-template-columns: repeat(7, 1fr) auto; right: var(--gutter); left: var(--gutter); }
  .station-nav__button span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  .station-nav__button[aria-current="step"] span { position: static; width: auto; height: auto; overflow: visible; clip-path: none; white-space: normal; }
  .entity-aperture { width: var(--focus-size, 5.5rem); }
  .world-label__chip { padding: .28rem .34rem; font-size: .52rem; }
  .world-label__chip strong { font-size: .58rem; }
  .world-label[data-visible="true"]:nth-child(n + 3) { display: none; }
  .entity-aperture__focus { display: none; }
  .status-legend { grid-template-columns: 1fr; }
  .ledger li { grid-template-columns: 2.5rem 1fr; gap: .3rem 1rem; }
  .ledger h3, .ledger li > p:not(.ledger__limit):not(.ledger__ref), .ledger__ref, .ledger__limit { grid-column: 2; }
  .ledger__limit { grid-row: auto; margin-top: .6rem; }
}

@media (max-height: 38rem) {
  :root[data-experience="flow"] .journey { height: auto; }
  :root[data-experience="flow"] .experience-shell { position: relative; height: auto; overflow: visible; }
  :root[data-experience="flow"] .story-deck { position: relative; }
  :root[data-experience="flow"] .story-panel { position: relative; min-height: 100svh; opacity: 1; transform: none; pointer-events: auto; }
  :root[data-experience="flow"] .entity-aperture { display: none; }
  :root[data-experience="flow"] .world-labels { display: none; }
}

@media (hover: none) { .ctl { min-width: 44px; } }

/* A reduced-motion journey settles immediately: no panel glide, cue pulse, or ambient easing. */
:root[data-motion="reduced"] .story-panel,
:root[data-motion="reduced"] .station-nav__trace span,
:root[data-motion="reduced"] .scroll-cue span,
:root[data-motion="reduced"] .rail__fill,
:root[data-motion="reduced"] .rail__cursor { transition: none; transform: none; animation: none; }
:root[data-motion="reduced"] .entity-aperture,
:root[data-motion="reduced"] .entity-aperture::before,
:root[data-motion="reduced"] .entity-aperture__arc,
:root[data-motion="reduced"] .world-labels,
:root[data-motion="reduced"] .world-label { transition: none; animation: none; }
:root[data-motion="reduced"] .scroll-cue span { background: var(--dimmer); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}

@media (prefers-contrast: more) {
  :root { --dim: #B6C4DA; --dimmer: #8C9CB8; --rule: rgba(123, 231, 255, .4); }
  .story-panel__scrim { background-color: rgba(3, 6, 16, .96); }
}