/* ==========================================================================
   VOYAGER / HELIOSPHERE / TIME — design system
   Black-and-white instrument aesthetic. Bauhaus grid + Futurist vector +
   spacecraft telemetry interface, read through contemporary web type.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --ink:        #0a0a0a;
  --paper:      #ffffff;
  --paper-dim:  #f3f3f1;
  --gray-1:     #6a6a68;
  --gray-2:     #a7a7a3;
  --hairline:   #dcdcd8;
  --space:      #08090a;
  --space-line: rgba(255,255,255,.16);
  --space-dim:  rgba(255,255,255,.52);
  --space-faint:rgba(255,255,255,.30);

  --f-display: 'Space Grotesk', 'IBM Plex Mono', sans-serif;
  --f-body:    'Inter', -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --f-mono:    'IBM Plex Mono', ui-monospace, SFMono-Regular, monospace;

  --gutter: clamp(20px, 4vw, 56px);
  --rule: 1px;
  --dur-slow: 60s;
  --ease: cubic-bezier(.2,.6,.2,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; scroll-behavior:auto !important; }
}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--f-body);
  font-size:16px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{ display:block; max-width:100%; }
a{ color:inherit; }
h1,h2,h3,p,figure{ margin:0; }
ul{ margin:0; padding:0; list-style:none; }
::selection{ background:var(--ink); color:var(--paper); }

:focus-visible{
  outline:2px solid var(--ink);
  outline-offset:3px;
}

/* ---------- type scale ---------- */
.eyebrow{
  font-family:var(--f-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--gray-1);
}
.eyebrow b{ color:var(--ink); font-weight:500; }

h1.title{
  font-family:var(--f-display);
  font-weight:600;
  font-size:clamp(2.4rem, 7vw, 6rem);
  line-height:.98;
  letter-spacing:-.01em;
}
h2.section-title{
  font-family:var(--f-display);
  font-weight:600;
  font-size:clamp(1.6rem, 3.4vw, 2.6rem);
  line-height:1.08;
  letter-spacing:-.005em;
}
h3.sub-title{
  font-family:var(--f-display);
  font-weight:500;
  font-size:clamp(1.1rem, 1.8vw, 1.4rem);
}
p.lede{
  font-family:var(--f-display);
  font-weight:400;
  font-size:clamp(1.15rem, 2vw, 1.55rem);
  line-height:1.34;
  letter-spacing:-.002em;
}
p.body-text{
  max-width:62ch;
  font-size:1rem;
  color:#1c1c1a;
}
p.body-text + p.body-text{ margin-top:1em; }
.caption{
  font-family:var(--f-mono);
  font-size:12px;
  color:var(--gray-1);
  letter-spacing:.02em;
  line-height:1.5;
}
.coord{
  font-family:var(--f-mono);
  font-size:11px;
  letter-spacing:.04em;
  color:var(--gray-1);
}
.tag-fact{ color:var(--ink); }
.tag-phil{ color:var(--gray-1); }

/* ---------- layout ---------- */
.wrap{
  max-width:1280px;
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  column-gap:clamp(14px,2vw,28px);
}
.rule{
  border:none;
  border-top:var(--rule) solid var(--hairline);
  margin:0;
}
.rule--dark{ border-top-color:var(--space-line); }
section{ position:relative; }
.pad-block{ padding-top:clamp(56px,9vw,120px); padding-bottom:clamp(56px,9vw,120px); }

/* label markers used only where sequence is real (page nav / layer tags) */
.marker{
  font-family:var(--f-mono);
  font-size:11px;
  color:var(--gray-1);
  letter-spacing:.08em;
}

/* ---------- top bar / nav ---------- */
.topbar{
  position:sticky; top:0; z-index:40;
  background:rgba(255,255,255,.86);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  border-bottom:var(--rule) solid var(--hairline);
}
.topbar .wrap{
  display:flex; align-items:center; justify-content:space-between;
  height:56px;
}
.brand{
  font-family:var(--f-mono);
  font-size:12px;
  letter-spacing:.06em;
  display:flex; gap:10px; align-items:baseline;
}
.brand .dot{ color:var(--gray-2); }
.pages-nav{ display:flex; gap:2px; align-items:center; }
.pages-nav a{
  font-family:var(--f-mono);
  font-size:11.5px;
  letter-spacing:.05em;
  text-decoration:none;
  color:var(--gray-1);
  padding:7px 12px;
  border:1px solid transparent;
  transition:color .2s var(--ease), border-color .2s var(--ease);
}
.pages-nav a:hover{ color:var(--ink); }
.pages-nav a.is-active{
  color:var(--ink);
  border-color:var(--hairline);
}
.nav-right{ display:flex; align-items:center; gap:18px; }
.hub-link{
  font-family:var(--f-mono); font-size:11.5px; letter-spacing:.05em;
  text-decoration:none; color:var(--gray-1);
  transition:color .2s var(--ease);
}
.hub-link:hover{ color:var(--ink); }
.langsw{ display:flex; gap:0; font-family:var(--f-mono); font-size:11.5px; letter-spacing:.05em; }
.langsw button{
  background:none; border:none; cursor:pointer;
  color:var(--gray-1); padding:6px 7px; font:inherit;
}
.langsw button.is-active{ color:var(--ink); text-decoration:underline; text-underline-offset:4px; }
.langsw span{ color:var(--gray-2); }

.telemetry{
  font-family:var(--f-mono);
  font-size:10.5px;
  color:var(--gray-2);
  letter-spacing:.03em;
  display:none;
}
@media (min-width:900px){ .telemetry{ display:block; } }

/* ---------- hero (space / inverted) ---------- */
.hero{
  background:var(--space);
  color:var(--paper);
  overflow:hidden;
  padding-top:clamp(64px,10vw,120px);
  padding-bottom:clamp(48px,7vw,88px);
}
.hero .eyebrow{ color:var(--space-dim); }
.hero .eyebrow b{ color:var(--paper); }
.hero h1.title{ color:var(--paper); }
.hero p.lede{ color:var(--space-dim); margin-top:1.1em; max-width:52ch; }
.hero-grid{ margin-top:clamp(36px,6vw,64px); }
.hero-field{
  position:relative;
  aspect-ratio:16/9;
  border:1px solid var(--space-line);
}
@media (max-width:720px){ .hero-field{ aspect-ratio:4/5; } }
.hero-field svg{ width:100%; height:100%; display:block; }
.hero-foot{
  margin-top:14px;
  display:flex; justify-content:space-between; gap:12px; flex-wrap:wrap;
}
.hero-foot .coord{ color:var(--space-faint); }

/* ---------- scroll cue ---------- */
.scrollcue{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--f-mono); font-size:10.5px; color:var(--space-faint);
  letter-spacing:.08em;
}
.scrollcue i{
  display:block; width:1px; height:26px; background:var(--space-line);
  position:relative; overflow:hidden;
}
.scrollcue i::after{
  content:''; position:absolute; left:0; top:-100%; width:100%; height:100%;
  background:var(--paper);
  animation:cue 2.6s var(--ease) infinite;
}
@keyframes cue{ 0%{top:-100%;} 60%{top:100%;} 100%{top:100%;} }

/* ---------- layer tag ---------- */
.layer-tag{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--f-mono); font-size:11px; letter-spacing:.1em;
  text-transform:uppercase; padding:5px 10px; border:1px solid var(--hairline);
}
.layer-tag.fact::before{ content:''; width:6px; height:6px; background:var(--ink); display:inline-block; }
.layer-tag.phil::before{ content:''; width:6px; height:6px; border:1px solid var(--gray-1); display:inline-block; }
.layer-tag.spec::before{ content:''; width:6px; height:6px; border:1px dashed var(--gray-1); display:inline-block; }

/* ---------- section header pattern ---------- */
.section-head{
  display:grid; grid-template-columns:1fr; gap:14px;
  margin-bottom:clamp(28px,4vw,48px);
}
@media (min-width:860px){
  .section-head{ grid-template-columns:220px 1fr; align-items:end; column-gap:24px; }
}
.section-head .eyebrow{ margin-bottom:10px; }

/* ---------- two column text ---------- */
.col-8{ grid-column:span 12; }
@media (min-width:860px){ .col-8{ grid-column:span 8; } }
.col-7{ grid-column:span 12; }
@media (min-width:860px){ .col-7{ grid-column:span 7; } }
.col-6{ grid-column:span 12; }
@media (min-width:860px){ .col-6{ grid-column:span 6; } }
.col-5{ grid-column:span 12; }
@media (min-width:860px){ .col-5{ grid-column:span 5; } }
.col-4{ grid-column:span 12; }
@media (min-width:860px){ .col-4{ grid-column:span 4; } }
.col-12{ grid-column:span 12; }

/* ---------- diagram frame ---------- */
.diagram{
  border:1px solid var(--hairline);
  padding:clamp(14px,3vw,28px);
  background:var(--paper);
}
.diagram-head{
  display:flex; justify-content:space-between; align-items:baseline;
  margin-bottom:16px; gap:10px; flex-wrap:wrap;
}
.diagram-head .caption{ max-width:34ch; }
.diagram svg{ width:100%; height:auto; overflow:visible; }
.diagram-foot{
  margin-top:14px; display:flex; justify-content:space-between; gap:10px; flex-wrap:wrap;
}
.legend{ display:flex; gap:16px; flex-wrap:wrap; }
.legend-item{ display:flex; align-items:center; gap:6px; font-family:var(--f-mono); font-size:10.5px; color:var(--gray-1); }
.legend-item i{ width:12px; height:1px; background:var(--ink); display:inline-block; }
.legend-item i.dashed{ background:none; border-top:1px dashed var(--gray-1); }
.legend-item i.dot{ width:6px; height:6px; border-radius:50%; background:var(--ink); }

/* ---------- fact / interpretation split ---------- */
.dual{
  display:grid; grid-template-columns:1fr; gap:1px;
  background:var(--hairline);
  border:1px solid var(--hairline);
}
@media (min-width:860px){ .dual{ grid-template-columns:1fr 1fr; } }
.dual > div{ background:var(--paper); padding:clamp(18px,3vw,30px); }
.dual h4{
  font-family:var(--f-mono); font-size:11px; letter-spacing:.1em; text-transform:uppercase;
  color:var(--gray-1); margin:0 0 12px;
}

/* ---------- data table (trajectories) ---------- */
.tele-table{ width:100%; border-collapse:collapse; font-family:var(--f-mono); font-size:12.5px; }
.tele-table th,.tele-table td{
  text-align:left; padding:10px 12px; border-bottom:1px solid var(--hairline);
  vertical-align:top;
}
.tele-table th{ color:var(--gray-1); font-weight:500; font-size:10.5px; letter-spacing:.06em; text-transform:uppercase; }
.tele-table td.num{ text-align:right; font-variant-numeric:tabular-nums; }
.tele-table tr:last-child td{ border-bottom:none; }

/* ---------- avoid box ---------- */
.avoid{
  border-left:2px solid var(--ink);
  padding:2px 0 2px 16px;
  font-family:var(--f-mono);
  font-size:12.5px;
  color:var(--gray-1);
}
.avoid s{ color:#9a9a96; }

/* ---------- maya block ---------- */
.maya{
  background:var(--space); color:var(--paper);
  padding:clamp(40px,7vw,88px) 0;
}
.maya .eyebrow{ color:var(--space-dim); }
.maya-grid{ display:grid; grid-template-columns:1fr; gap:32px; align-items:center; }
@media (min-width:860px){ .maya-grid{ grid-template-columns:1.1fr .9fr; gap:48px; } }
.maya-count{
  font-family:var(--f-mono);
  font-size:clamp(2.1rem, 6.4vw, 4.4rem);
  letter-spacing:.01em;
  display:flex; flex-wrap:wrap; gap:.14em .02em;
}
.maya-count b{ font-weight:500; color:var(--paper); }
.maya-count span.sep{ color:var(--space-faint); font-weight:400; }
.maya-sub{ margin-top:14px; color:var(--space-dim); font-family:var(--f-mono); font-size:12.5px; letter-spacing:.03em; }
.maya-units{ margin-top:20px; display:grid; grid-template-columns:repeat(5,1fr); gap:1px; background:var(--space-line); border:1px solid var(--space-line); }
.maya-units div{ background:var(--space); padding:10px 8px; }
.maya-units .u-label{ font-family:var(--f-mono); font-size:9.5px; letter-spacing:.08em; color:var(--space-faint); text-transform:uppercase; }
.maya-units .u-val{ font-family:var(--f-mono); font-size:16px; margin-top:4px; color:var(--paper); }

/* ---------- footer ---------- */
footer{
  border-top:1px solid var(--hairline);
  padding:clamp(36px,6vw,64px) 0;
}
.footer-grid{ display:grid; grid-template-columns:1fr; gap:24px; }
@media (min-width:860px){ .footer-grid{ grid-template-columns:1.4fr 1fr 1fr; } }
.foot-question{ font-family:var(--f-display); font-size:clamp(1.1rem,2vw,1.5rem); line-height:1.3; max-width:34ch; }
.foot-next{ display:flex; flex-direction:column; gap:6px; }
.foot-next a{ font-family:var(--f-mono); font-size:12.5px; text-decoration:none; color:var(--ink); border-bottom:1px solid var(--hairline); padding-bottom:2px; width:fit-content; }
.foot-meta{ font-family:var(--f-mono); font-size:11px; color:var(--gray-1); line-height:1.7; }

/* ---------- reveal on scroll ---------- */
[data-reveal]{
  opacity:0; transform:translateY(14px);
  transition:opacity .7s var(--ease), transform .7s var(--ease);
}
[data-reveal].is-in{ opacity:1; transform:translateY(0); }

/* ---------- svg motion helpers ---------- */
.spin-slow{ animation:spin 90s linear infinite; transform-origin:center; }
@keyframes spin{ to{ transform:rotate(360deg); } }
.pulse-out{ animation:pulseOut 6s var(--ease) infinite; }
@keyframes pulseOut{
  0%{ opacity:.9; r:4; }
  70%{ opacity:0; }
  100%{ opacity:0; r:120; }
}
.dash-flow{ stroke-dasharray:4 6; animation:dashmove 26s linear infinite; }
@keyframes dashmove{ to{ stroke-dashoffset:-400; } }
.probe-drift{ animation:drift 40s var(--ease) infinite alternate; }
@keyframes drift{ from{ transform:translate(0,0);} to{ transform:translate(4px,-3px);} }

/* ---------- misc ---------- */
.small-note{ font-family:var(--f-mono); font-size:11px; color:var(--gray-1); }
.center-line{ position:relative; }
.numflag{ font-family:var(--f-mono); font-size:11px; color:var(--gray-2); }
[lang-hide]{ display:none; }

/* ---------- bilingual content toggle ---------- */
html[data-lang="en"] [data-lang="ru"]{ display:none !important; }
html[data-lang="ru"] [data-lang="en"]{ display:none !important; }
html:not([data-lang]) [data-lang="ru"]{ display:none !important; }