/* ============================================================
   YATHARTHA LABS — design tokens
   ============================================================ */
:root{
  --sky:#0A0E14;            /* pre-dawn gunmetal base */
  --surface:#0D121A;
  --panel:#131A24;
  --line:rgba(158,170,180,.13);
  --line-strong:rgba(158,170,180,.30);
  --bone:#E9EAE4;
  --slate:#8B95A0;
  --slate-dim:#5A626C;
  --flare:#E2571E;          /* remove-before-flight orange */
  --flare-soft:rgba(226,87,30,.13);
  --phosphor:#6FBF8E;
  --alert:#D64545;

  --disp:'Archivo',sans-serif;
  --body:'Instrument Sans',sans-serif;
  --mono:'IBM Plex Mono',monospace;
  --maxw:1400px;
  --pad:clamp(24px,5vw,72px);

  /* ---- single rem-based type scale (used everywhere) ---- */
  --fs-display:4.75rem;   /* hero h1                        */
  --fs-title:2.5rem;      /* section titles                 */
  --fs-statement:2rem;    /* lead statements                */
  --fs-lede:1.375rem;     /* section intros / ledes         */
  --fs-subhead:1.1875rem; /* display-font subheads          */
  --fs-body:1.0625rem;    /* all body copy                  */
  --fs-small:0.9375rem;   /* secondary micro-copy           */
  --fs-btn:0.75rem;       /* buttons / wordmark             */
  --fs-label:0.6875rem;   /* mono labels, nav, tags, meta   */
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--sky);
  color:var(--bone);
  font-family:var(--body);
  font-weight:400;
  font-size:var(--fs-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:var(--flare);color:var(--sky)}
a{color:inherit;text-decoration:none}
img,svg{max-width:100%}
p{line-height:1.72}
:focus-visible{outline:2px solid var(--flare);outline-offset:3px}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad);position:relative}

/* ---------- typographic roles ---------- */
h1,h2,h3{text-wrap:balance}
h1{
  font-family:var(--disp);
  font-weight:680;
  font-stretch:118%;
  font-size:var(--fs-display);
  line-height:.96;
  letter-spacing:-.015em;
  text-transform:uppercase;
}
.sec-title{
  font-family:var(--disp);
  font-weight:650;
  font-stretch:116%;
  font-size:var(--fs-title);
  line-height:1.02;
  letter-spacing:-.01em;
  text-transform:uppercase;
  margin-top:14px;
}
.statement{
  font-family:var(--disp);
  font-weight:560;
  font-stretch:108%;
  font-size:var(--fs-statement);
  line-height:1.18;
  letter-spacing:-.005em;
}
.designator{
  font-family:var(--mono);
  font-size:var(--fs-label);
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--flare);
  display:flex;align-items:center;gap:14px;
}
.designator::before{content:"";width:32px;height:1px;background:var(--flare);flex-shrink:0}
.flag{
  display:inline-block;width:1.75em;height:auto;vertical-align:-.42em;
  border-radius:2px;box-shadow:0 0 0 1px rgba(0,0,0,.3);
}
.foot-origin .flag{margin-left:.3em}
.mono-line{
  font-family:var(--mono);
  font-size:var(--fs-label);
  letter-spacing:.14em;
  color:var(--slate-dim);
  text-transform:uppercase;
}

/* ---------- ambient terrain canvas ---------- */
#terrain{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  width:100vw;height:100vh;display:block;
}
.terrain-fade{
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    linear-gradient(180deg,rgba(10,14,20,.25) 0%,rgba(10,14,20,.72) 62%,var(--sky) 100%);
}
main,footer,.nav{position:relative;z-index:2}

/* ---------- nav ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;gap:32px;
  padding:16px var(--pad);
  border-bottom:1px solid transparent;
  transition:background .4s,border-color .4s,backdrop-filter .4s;
}
.nav.scrolled{
  background:rgba(10,14,20,.82);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:12px;color:var(--bone)}
.logo-mark{display:block;object-fit:contain;flex-shrink:0}
.brand .logo-mark{width:28px;height:28px}
.brand .wm{
  font-family:var(--disp);font-weight:600;font-stretch:112%;
  font-size:var(--fs-btn);letter-spacing:.26em;
}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links a{
  font-family:var(--mono);font-size:var(--fs-label);letter-spacing:.12em;
  text-transform:uppercase;color:var(--slate);white-space:nowrap;
  position:relative;transition:color .25s;
}
.nav-links a:hover{color:var(--bone)}
.nav-links a:not(.nav-cta)::after{
  content:"";position:absolute;left:0;bottom:-6px;height:1px;width:0;
  background:var(--flare);transition:width .3s;
}
.nav-links a:not(.nav-cta):hover::after{width:100%}
.nav-cta{
  color:var(--bone) !important;
  border:1px solid var(--line-strong);
  padding:9px 18px;
  transition:border-color .3s,color .3s,background .3s;
}
.nav-cta:hover{border-color:var(--flare);background:var(--flare-soft)}
.burger{
  display:none;flex-direction:column;gap:6px;background:none;border:none;
  cursor:pointer;padding:8px;
}
.burger span{width:24px;height:1.5px;background:var(--bone);transition:transform .3s,opacity .3s}
.burger[aria-expanded="true"] span:first-child{transform:translateY(4px) rotate(45deg)}
.burger[aria-expanded="true"] span:last-child{transform:translateY(-3.5px) rotate(-45deg)}

/* ---------- buttons ---------- */
.btn{
  font-family:var(--mono);font-size:var(--fs-btn);letter-spacing:.1em;text-transform:uppercase;
  display:inline-flex;align-items:center;gap:10px;white-space:nowrap;
  padding:15px 28px;border:1px solid transparent;cursor:pointer;
  transition:background .3s,color .3s,border-color .3s,transform .25s;
}
.btn-solid{background:var(--bone);color:var(--sky)}
.btn-solid:hover{background:var(--flare);color:var(--sky);transform:translateY(-2px)}
.btn-line{border-color:var(--line-strong);color:var(--bone);background:transparent}
.btn-line:hover{border-color:var(--flare);color:var(--flare)}
.btn.lower{text-transform:none;letter-spacing:.02em}

/* ---------- hero ---------- */
.hero{
  min-height:100svh;
  display:flex;flex-direction:column;justify-content:center;
  padding:140px 0 0;
  position:relative;
}
.hero h1{margin:30px 0 0}
.hero-sky{position:absolute;inset:0;width:100%;height:100%;display:block;z-index:0;pointer-events:none}
.hero > .wrap{position:relative;z-index:1}
.hero-sub{
  max-width:56ch;margin-top:30px;line-height:1.6;
  font-size:var(--fs-lede);color:var(--slate);
}
.hero-actions{display:flex;gap:14px;margin-top:44px;flex-wrap:wrap}
.hero-foot{
  margin-top:auto;position:relative;z-index:1;
  border-top:1px solid var(--line);
  padding:18px 0;
}
.hero-foot-inner{
  display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;
}
.hero-scroll .scroll-tick{display:inline-block;animation:bob 2.2s ease-in-out infinite;color:var(--flare)}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(4px)}}

/* ---------- sections ---------- */
.sec{padding:clamp(84px,11vh,132px) 0}

/* mission */
.mission{background:linear-gradient(180deg,transparent,rgba(13,18,26,.6))}
.mission-grid{
  display:grid;grid-template-columns:1.2fr .9fr;gap:clamp(40px,6vw,96px);
  margin-top:48px;align-items:start;
}
.mission-copy p{color:var(--slate);font-size:var(--fs-body);max-width:46ch}
.mission-copy p + p{margin-top:1.15em}

/* approach */
.approach{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.principles{
  display:grid;grid-template-columns:repeat(3,1fr);
  margin-top:56px;border-top:1px solid var(--line);
}
.principle{
  padding:38px 34px 42px 0;
  border-right:1px solid var(--line);
  position:relative;
}
.principle:last-child{border-right:none}
.principle + .principle{padding-left:34px}
.principle::before{
  content:"";position:absolute;top:-1px;left:0;height:1px;width:0;
  background:var(--flare);transition:width .8s cubic-bezier(.2,.7,.2,1);
}
.principle:hover::before{width:calc(100% - 34px)}
.principle h3{
  font-family:var(--disp);font-weight:620;font-stretch:110%;
  font-size:var(--fs-subhead);text-transform:uppercase;letter-spacing:.02em;
  margin-bottom:16px;
}
.principle p{color:var(--slate);font-size:var(--fs-body);max-width:40ch}

/* systems / PRATAP */
.sys-grid{
  display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(40px,6vw,80px);
  align-items:center;margin-top:10px;
}
.sys-lede{
  margin-top:26px;font-size:var(--fs-lede);line-height:1.5;
  color:var(--bone);max-width:40ch;font-weight:500;
}
.sys-body{margin-top:20px;color:var(--slate);font-size:var(--fs-body);max-width:46ch}
.sys-tags{
  list-style:none;display:flex;flex-wrap:wrap;gap:10px;margin-top:30px;
}
.sys-tags li{
  font-family:var(--mono);font-size:var(--fs-label);letter-spacing:.14em;text-transform:uppercase;
  color:var(--slate);border:1px solid var(--line-strong);padding:8px 14px;
  transition:color .3s,border-color .3s;
}
.sys-tags li:hover{color:var(--flare);border-color:var(--flare)}
.sys-note{
  margin-top:28px;font-family:var(--mono);font-size:var(--fs-label);letter-spacing:.1em;
  color:var(--slate-dim);text-transform:uppercase;
}
.sys-visual{
  border:1px solid var(--line);background:rgba(13,18,26,.55);
  padding:clamp(16px,3vw,36px);position:relative;
}
.sys-visual figcaption{margin-top:14px;text-align:right}
.sys-visual::before,.sys-visual::after{
  content:"";position:absolute;width:18px;height:18px;border:1px solid var(--flare);opacity:.55;
}
.sys-visual::before{top:-1px;left:-1px;border-right:none;border-bottom:none}
.sys-visual::after{bottom:-1px;right:-1px;border-left:none;border-top:none}

/* launch simulation */
.sim-stage{
  position:relative;width:100%;aspect-ratio:8/5;overflow:hidden;
  background:
    radial-gradient(120% 90% at 24% 116%,rgba(226,87,30,.08),transparent 55%),
    linear-gradient(180deg,rgba(19,26,36,.55),var(--sky) 70%);
  cursor:crosshair;
}
#launchSim{position:absolute;inset:0;width:100%;height:100%;display:block}
.sim-hud{
  position:absolute;top:12px;left:14px;right:14px;z-index:2;
  display:flex;justify-content:space-between;gap:12px;pointer-events:none;
}
.sim-phase{color:var(--flare)}
.sim-ai{display:inline-flex;align-items:center;gap:7px;color:var(--slate)}
.sim-ai .dot{
  width:7px;height:7px;border-radius:50%;background:var(--slate-dim);
  display:inline-block;transition:background .3s,box-shadow .3s;
}
.sim-ai.acquire .dot{background:var(--flare);box-shadow:0 0 9px var(--flare-soft)}
.sim-ai.live .dot{background:var(--phosphor);box-shadow:0 0 9px rgba(111,191,142,.75)}
.sim-launch{
  position:absolute;left:14px;bottom:14px;z-index:3;
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--mono);font-size:var(--fs-label);letter-spacing:.14em;text-transform:uppercase;
  color:var(--sky);background:var(--bone);border:1px solid var(--bone);cursor:pointer;
  padding:10px 16px;transition:background .3s,color .3s,border-color .3s,transform .2s;
}
.sim-launch svg{width:11px;height:11px}
.sim-launch:hover{background:var(--flare);border-color:var(--flare);transform:translateY(-1px)}
.sim-launch.flying{background:transparent;color:var(--bone);border-color:var(--line-strong)}
.sim-launch.flying:hover{background:transparent;border-color:var(--flare);color:var(--flare)}
.sim-hint{
  position:absolute;right:14px;bottom:17px;z-index:2;pointer-events:none;
  color:var(--slate-dim);font-size:var(--fs-label);letter-spacing:.12em;transition:opacity .5s;
}
@media(max-width:560px){.sim-hint{display:none}}

/* autonomy / DRISHTI */
.autonomy{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.auto-grid{
  display:grid;grid-template-columns:.95fr 1.05fr;gap:clamp(40px,6vw,80px);
  align-items:center;margin-top:10px;
}
.feat-list{list-style:none;margin-top:34px;border-top:1px solid var(--line)}
.feat-list li{
  padding:18px 0;border-bottom:1px solid var(--line);
  display:grid;grid-template-columns:220px 1fr;gap:22px;align-items:baseline;
}
.feat-list b{
  font-family:var(--disp);font-weight:600;font-stretch:108%;font-size:var(--fs-subhead);
  text-transform:uppercase;letter-spacing:.02em;line-height:1.3;
}
.feat-list span{color:var(--slate);font-size:var(--fs-body);line-height:1.6}

/* denial demo */
.demo{border:1px solid var(--line);background:var(--sky)}
.demo-head{
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:14px 18px;border-bottom:1px solid var(--line);flex-wrap:wrap;
}
.demo-status{display:inline-flex;align-items:center;gap:8px;color:var(--slate)}
.demo-status .dot{width:7px;height:7px;border-radius:50%;display:inline-block}
.demo-status .dot.ok{background:var(--phosphor);box-shadow:0 0 8px rgba(111,191,142,.7)}
.demo-status .dot.bad{background:var(--alert);box-shadow:0 0 8px rgba(214,69,69,.7);animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:.25}}
.demo-stage{position:relative}
#demoCanvas{display:block;width:100%;height:320px}
.demo-hud{position:absolute;left:18px;bottom:14px;color:var(--slate)}
.demo-foot{
  display:flex;align-items:center;gap:20px;padding:16px 18px;
  border-top:1px solid var(--line);flex-wrap:wrap;
}
.demo-btn{padding:12px 20px}
.demo-btn.denied{background:var(--alert);color:var(--bone)}
.demo-caption{color:var(--slate-dim);font-size:var(--fs-small);max-width:40ch;line-height:1.45}

/* company */
.company{background:var(--surface);border-top:1px solid var(--line)}
.company-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,7vw,110px);
  align-items:center;
}
.company-body{border-left:1px solid var(--line);padding-left:clamp(28px,4vw,56px)}
.company-lede{color:var(--bone);font-size:var(--fs-lede);line-height:1.5;max-width:34ch}
.company-note{margin-top:28px}

/* careers */
.careers{border-top:1px solid var(--line)}
.careers-grid{
  display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(40px,6vw,90px);
  align-items:start;margin-top:10px;
}
.careers-lede{margin-top:22px;color:var(--slate);font-size:var(--fs-lede);line-height:1.5;max-width:40ch}
.careers-head .btn{margin-top:30px}
.roles{list-style:none;border-top:1px solid var(--line)}
.roles a{
  display:grid;grid-template-columns:1fr auto;gap:20px;align-items:center;
  padding:20px 2px;border-bottom:1px solid var(--line);
  position:relative;transition:padding .3s ease,background .3s;
}
.roles a::before{
  content:"";position:absolute;left:-16px;top:50%;transform:translateY(-50%);
  width:0;height:1px;background:var(--flare);transition:width .3s;
}
.roles a:hover{padding-left:18px}
.roles a:hover::before{width:12px}
.role-t{
  display:block;font-family:var(--disp);font-weight:600;font-stretch:108%;
  font-size:var(--fs-subhead);text-transform:uppercase;letter-spacing:.01em;transition:color .3s;
}
.roles a:hover .role-t{color:var(--flare)}
.role-d{display:block;color:var(--slate);font-size:var(--fs-body);margin-top:5px;max-width:54ch}
.role-arrow{
  font-family:var(--mono);font-size:var(--fs-subhead);color:var(--slate-dim);
  transition:transform .3s,color .3s;
}
.roles a:hover .role-arrow{color:var(--flare);transform:translateX(6px)}
.careers-foot{margin-top:26px;color:var(--slate);font-size:var(--fs-body)}
.careers-foot a{color:var(--bone);border-bottom:1px solid var(--line-strong);transition:color .3s,border-color .3s}
.careers-foot a:hover{color:var(--flare);border-color:var(--flare)}

/* contact */
.contact{position:relative;overflow:hidden}
.contact::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(ellipse 60% 50% at 50% 100%,var(--flare-soft),transparent 70%);
}
.contact-grid{
  display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(40px,6vw,90px);
  align-items:end;
}
.contact .statement{margin-top:30px;max-width:22ch}
.contact-sub{color:var(--slate);font-size:var(--fs-body);max-width:46ch}
.contact-actions{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}

/* footer */
footer{border-top:1px solid var(--line);background:var(--sky);padding:44px 0}
.foot-grid{
  display:flex;justify-content:space-between;align-items:center;gap:28px;flex-wrap:wrap;
}
.foot-brand{display:flex;align-items:center;gap:12px;color:var(--slate)}
.foot-brand .logo-mark{width:24px;height:24px}
.foot-brand .wm{
  font-family:var(--disp);font-weight:600;font-stretch:112%;
  font-size:var(--fs-btn);letter-spacing:.26em;color:var(--bone);
}
.foot-links{display:flex;gap:26px;flex-wrap:wrap}
.foot-links a{
  font-family:var(--mono);font-size:var(--fs-label);letter-spacing:.12em;text-transform:uppercase;
  color:var(--slate);transition:color .25s;
}
.foot-links a:hover{color:var(--flare)}
.foot-meta{display:flex;flex-direction:column;gap:6px;text-align:right}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .9s cubic-bezier(.2,.7,.2,1),transform .9s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
/* type scale steps down as one system — still a single rem-based scale */
@media(max-width:1024px){
  :root{--fs-display:3.6rem;--fs-title:2.15rem}
}
@media(max-width:640px){
  :root{
    --fs-display:2.55rem;--fs-title:1.85rem;--fs-statement:1.6rem;
    --fs-lede:1.2rem;--fs-subhead:1.1rem;
  }
}
@media(max-width:1024px){
  .mission-grid,.sys-grid,.auto-grid,.company-grid,.contact-grid,.careers-grid{grid-template-columns:1fr;gap:44px}
  .company-grid,.contact-grid{align-items:start}
  .company-body{border-left:none;padding-left:0}
  .principles{grid-template-columns:1fr}
  .principle{border-right:none;border-bottom:1px solid var(--line);padding:30px 0}
  .principle + .principle{padding-left:0}
  .principle:last-child{border-bottom:none}
}
@media(max-width:1024px){
  .nav-links{
    position:fixed;top:0;right:0;bottom:0;width:78%;max-width:330px;
    flex-direction:column;align-items:flex-start;justify-content:center;gap:30px;
    background:rgba(10,14,20,.97);backdrop-filter:blur(18px);
    border-left:1px solid var(--line);padding:0 42px;
    transform:translateX(100%);transition:transform .4s;
  }
  .nav-links.open{transform:none}
  .nav-links a{font-size:15px}
  .burger{display:flex;z-index:70;position:relative}
}
@media(max-width:768px){
  .hero{padding-top:110px}
  .hero-foot-inner{justify-content:center}
  .hero-foot-inner .hero-scroll{display:none}
  .feat-list li{grid-template-columns:1fr;gap:6px}
  .foot-grid{flex-direction:column;align-items:flex-start}
  .foot-meta{text-align:left}
}

/* ---------- reduced motion ---------- */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none !important;transition:none !important}
  .reveal{opacity:1;transform:none}
}