/* ============================================================
   TarkHQ — Design System
   "Tark" (तर्क) = reason / logic. A house of applied reason,
   moving from software to fundamental science.
   Aesthetic: research-instrument precision on warm paper.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600&family=Space+Grotesk:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  /* Paper + ink */
  --paper:      #f4f1ea;   /* warm paper base */
  --paper-2:    #eeeae0;   /* recessed panel */
  --card:       #fbfaf6;   /* raised surface */
  --ink:        #1a1c1a;   /* near-black graphite, green tint */
  --ink-2:      #4b4f49;   /* secondary text */
  --ink-3:      #8a8d84;   /* muted / captions */
  --line:       #d8d3c6;   /* hairline rule */
  --line-2:     #c4bfb0;   /* stronger rule */

  /* Signal — a single reactive blue, like a spectral line */
  --signal:     #1f4fff;
  --signal-ink: #123bcf;
  --signal-wash:#e6ebff;

  /* Reaction accent — used sparingly for "science" surfaces */
  --react:      #d4482a;   /* burnt vermilion, oxidising */

  --font-display:'Fraunces', Georgia, serif;
  --font-body:   'Space Grotesk', system-ui, sans-serif;
  --font-mono:   'IBM Plex Mono', monospace;

  --wrap: 1180px;
  --gutter: clamp(20px, 5vw, 64px);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* subtle grid texture over the whole page — like graph paper */
body::before{
  content:"";
  position:fixed; inset:0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:64px 64px;
  opacity:.28;
  pointer-events:none;
  z-index:0;
}
main, header, footer{position:relative; z-index:1}

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

/* ---------- Type ---------- */
h1,h2,h3,h4{font-family:var(--font-display); font-weight:500; line-height:1.05; letter-spacing:-.01em; margin:0}
h1{font-size:clamp(2.6rem,6vw,4.9rem)}
h2{font-size:clamp(1.9rem,3.6vw,2.9rem)}
h3{font-size:1.35rem; letter-spacing:-.005em}
p{margin:0 0 1rem}
.lead{font-size:clamp(1.1rem,1.7vw,1.35rem); color:var(--ink-2); line-height:1.5; max-width:60ch}

.mono{font-family:var(--font-mono); font-size:.82rem; letter-spacing:.02em}
.tag{font-family:var(--font-mono); font-size:.72rem; color:var(--ink-3); letter-spacing:.08em}

/* ---------- Nav ---------- */
header.nav{
  position:sticky; top:0; z-index:50;
  background:color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-in{display:flex; align-items:center; justify-content:space-between; height:68px}
.brand{display:flex; align-items:center; gap:11px; font-family:var(--font-display); font-size:1.3rem; font-weight:600; letter-spacing:-.02em}
.brand .glyph{width:26px; height:26px; flex:none}
.nav-links{display:flex; gap:30px; align-items:center}
.nav-links a{font-size:.95rem; color:var(--ink-2)}
.nav-links a:hover{color:var(--ink)}
.nav-links a.here{color:var(--ink)}
.nav-cta{
  font-family:var(--font-mono); font-size:.8rem;
  border:1px solid var(--ink); border-radius:2px;
  padding:9px 15px; color:var(--ink) !important;
  transition:background .15s, color .15s;
}
.nav-cta:hover{background:var(--ink); color:var(--paper) !important}
.burger{display:none; background:none; border:0; cursor:pointer; font-family:var(--font-mono); font-size:.85rem}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:9px;
  font-family:var(--font-mono); font-size:.85rem; letter-spacing:.01em;
  padding:13px 22px; border-radius:2px; cursor:pointer;
  border:1px solid var(--ink); background:var(--ink); color:var(--paper);
  transition:transform .12s ease, box-shadow .12s ease;
}
.btn:hover{transform:translateY(-2px); box-shadow:4px 6px 0 var(--line-2)}
.btn.ghost{background:transparent; color:var(--ink)}
.btn.ghost:hover{background:var(--paper-2); box-shadow:4px 6px 0 var(--line-2)}
.btn .arrow{transition:transform .15s}
.btn:hover .arrow{transform:translate(3px,-3px)}

/* ---------- Sections ---------- */
section{padding:clamp(64px,9vw,120px) 0}
.eyebrow{
  display:inline-flex; align-items:center; gap:9px;
  font-family:var(--font-mono); font-size:.75rem; color:var(--ink-3);
  letter-spacing:.06em; margin-bottom:22px;
}
.eyebrow::before{content:""; width:26px; height:1px; background:var(--line-2)}

/* ---------- Ventures list ---------- */
.venture{
  display:grid; grid-template-columns: 90px 1fr auto;
  gap:28px; align-items:start;
  padding:34px 0; border-top:1px solid var(--line);
}
.venture:last-child{border-bottom:1px solid var(--line)}
.venture .idx{font-family:var(--font-mono); font-size:.8rem; color:var(--ink-3); padding-top:6px}
.venture h3{margin-bottom:8px; font-size:1.7rem}
.venture .status{font-family:var(--font-mono); font-size:.72rem; padding:4px 9px; border-radius:2px; white-space:nowrap; margin-top:4px}
.status.live{background:var(--signal-wash); color:var(--signal-ink)}
.status.build{background:#eaf3ea; color:#2f6b3a}
.status.soon{background:var(--paper-2); color:var(--ink-3); border:1px solid var(--line)}
.venture p{color:var(--ink-2); max-width:58ch; margin-bottom:10px}
.venture .meta{font-family:var(--font-mono); font-size:.78rem; color:var(--ink-3)}

/* ---------- Feature / value cards ---------- */
.grid-2{display:grid; grid-template-columns:repeat(2,1fr); gap:1px; background:var(--line); border:1px solid var(--line)}
.grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line)}
.cell{background:var(--paper); padding:32px}
.cell h3{margin-bottom:10px}
.cell p{color:var(--ink-2); margin:0; font-size:.98rem}
.cell .k{font-family:var(--font-mono); font-size:.75rem; color:var(--signal-ink); margin-bottom:16px; display:block}

/* ---------- Discipline chips ---------- */
.disc{display:flex; flex-wrap:wrap; gap:10px; margin-top:8px}
.disc span{font-family:var(--font-mono); font-size:.78rem; border:1px solid var(--line-2); padding:7px 13px; border-radius:2px; background:var(--card)}

/* ---------- Footer ---------- */
footer{border-top:1px solid var(--line-2); padding:64px 0 40px; background:var(--paper-2)}
.foot-grid{display:grid; grid-template-columns:1.6fr 1fr 1fr; gap:40px; margin-bottom:48px}
.foot-grid h4{font-family:var(--font-mono); font-weight:500; font-size:.78rem; color:var(--ink-3); letter-spacing:.06em; margin-bottom:18px}
.foot-grid a{display:block; color:var(--ink-2); margin-bottom:10px; font-size:.95rem}
.foot-grid a:hover{color:var(--ink)}
.foot-bar{display:flex; justify-content:space-between; align-items:center; padding-top:28px; border-top:1px solid var(--line); font-family:var(--font-mono); font-size:.75rem; color:var(--ink-3); flex-wrap:wrap; gap:12px}

/* ---------- Contact ---------- */
.contact-grid{display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:start}
.field{display:block; margin-bottom:20px}
.field label{font-family:var(--font-mono); font-size:.76rem; color:var(--ink-2); display:block; margin-bottom:7px; letter-spacing:.03em}
.field input, .field textarea{
  width:100%; font-family:var(--font-body); font-size:1rem;
  padding:13px 14px; border:1px solid var(--line-2); border-radius:2px;
  background:var(--card); color:var(--ink);
}
.field input:focus, .field textarea:focus{outline:2px solid var(--signal); outline-offset:0; border-color:var(--signal)}
.detail-row{display:flex; gap:14px; padding:16px 0; border-bottom:1px solid var(--line)}
.detail-row .lbl{font-family:var(--font-mono); font-size:.75rem; color:var(--ink-3); width:92px; flex:none; padding-top:2px}
.detail-row .val{font-size:1rem}
.detail-row .val a{color:var(--signal-ink)}

/* ---------- Founder ---------- */
.founder{display:grid; grid-template-columns:1fr 1.4fr; gap:56px; align-items:center}
.portrait{
  aspect-ratio:4/5; background:var(--card); border:1px solid var(--line-2);
  display:flex; align-items:flex-end; padding:26px; position:relative; overflow:hidden;
}
.portrait .mono{color:var(--ink-3)}
.portrait::after{
  content:"SR"; position:absolute; top:-10px; right:16px;
  font-family:var(--font-display); font-size:11rem; color:var(--paper-2); z-index:0; line-height:1;
}
.portrait .mono{position:relative; z-index:1}

/* ---------- Callout band ---------- */
.band{background:var(--ink); color:var(--paper); border-radius:3px; padding:clamp(40px,6vw,72px)}
.band h2{color:var(--paper)}
.band p{color:#c9c7bf}
.band .btn{background:var(--paper); color:var(--ink); border-color:var(--paper)}
.band .btn:hover{box-shadow:4px 6px 0 rgba(255,255,255,.15)}
.band .btn.ghost{background:transparent; color:var(--paper); border-color:#5a5c56}

/* ---------- Hero ---------- */
.hero{padding-top:clamp(56px,8vw,96px); padding-bottom:clamp(56px,8vw,96px)}
.hero h1{max-width:16ch; margin-bottom:26px}
.hero .lead{margin-bottom:34px}
.hero-actions{display:flex; gap:14px; flex-wrap:wrap; margin-bottom:56px}
.hero-strip{
  display:grid; grid-template-columns:repeat(4,1fr);
  border:1px solid var(--line); background:var(--line); gap:1px;
}
.hero-strip .s{background:var(--paper); padding:20px 22px}
.hero-strip .n{font-family:var(--font-display); font-size:1.9rem; display:block}
.hero-strip .l{font-family:var(--font-mono); font-size:.72rem; color:var(--ink-3)}

/* section intro block */
.intro{max-width:64ch; margin-bottom:52px}

/* thesis / arc */
.arc{display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line)}
.arc .stage{background:var(--paper); padding:30px}
.arc .stage .num{font-family:var(--font-mono); font-size:.75rem; color:var(--signal-ink)}
.arc .stage h3{margin:12px 0 8px; font-size:1.25rem}
.arc .stage p{font-size:.95rem; color:var(--ink-2); margin:0}

.page-head{padding:clamp(56px,8vw,92px) 0 clamp(30px,4vw,48px); border-bottom:1px solid var(--line)}
.page-head h1{font-size:clamp(2.4rem,5vw,3.8rem); max-width:20ch; margin-bottom:20px}

.two-col{display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:start}

.note{background:var(--signal-wash); border-left:2px solid var(--signal); padding:18px 22px; font-size:.95rem; color:var(--ink-2); border-radius:0 2px 2px 0}

/* ---------- Responsive ---------- */
@media (max-width:860px){
  .nav-links{
    display:none; position:absolute; top:68px; left:0; right:0;
    flex-direction:column; gap:0; background:var(--paper);
    border-bottom:1px solid var(--line); padding:8px 0;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:14px var(--gutter)}
  .burger{display:block}
  .grid-2,.grid-3,.arc{grid-template-columns:1fr}
  .hero-strip{grid-template-columns:1fr 1fr}
  .contact-grid,.founder,.two-col{grid-template-columns:1fr; gap:36px}
  .foot-grid{grid-template-columns:1fr 1fr}
  .venture{grid-template-columns:1fr; gap:8px}
  .venture .idx{padding-top:0}
}
@media (max-width:520px){
  .hero-strip{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr}
}
/* ---------- Signature hero animation: spectral beam ---------- */
.hero{position:relative; overflow:hidden}
.beam{
  position:absolute; top:0; bottom:0; left:0; width:100%;
  pointer-events:none; z-index:0; opacity:.9;
}
.beam svg{width:100%; height:100%}
.beam .ray{stroke:var(--signal); stroke-width:1.1; fill:none; opacity:0}
.hero .wrap{position:relative; z-index:1}

/* draw-on animation for the rays */
@keyframes drawRay{
  0%{stroke-dashoffset:1400; opacity:0}
  12%{opacity:.55}
  100%{stroke-dashoffset:0; opacity:.32}
}
@keyframes pulseDot{
  0%,100%{r:2.4; opacity:1}
  50%{r:4.2; opacity:.55}
}
.beam .ray{stroke-dasharray:1400; animation:drawRay 2.2s cubic-bezier(.2,.7,.2,1) forwards}
.beam .ray:nth-child(1){animation-delay:.05s}
.beam .ray:nth-child(2){animation-delay:.25s}
.beam .ray:nth-child(3){animation-delay:.45s}
.beam .ray:nth-child(4){animation-delay:.65s}
.beam .ray:nth-child(5){animation-delay:.85s}
.beam .node{fill:var(--signal); animation:pulseDot 3s ease-in-out infinite}

/* hero content staged entrance — the one page-load sequence */
.stagger>*{opacity:0; transform:translateY(14px); animation:rise .7s cubic-bezier(.2,.7,.2,1) forwards}
.stagger>*:nth-child(1){animation-delay:.15s}
.stagger>*:nth-child(2){animation-delay:.28s}
.stagger>*:nth-child(3){animation-delay:.41s}
.stagger>*:nth-child(4){animation-delay:.54s}
.stagger>*:nth-child(5){animation-delay:.67s}
@keyframes rise{to{opacity:1; transform:none}}

/* scroll-reveal: applied only to a few structural blocks, not everything */
.reveal{opacity:0; transform:translateY(18px); transition:opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1; transform:none}

/* venture row: reactive underline + hover lift of the title */
.venture{transition:background .25s ease}
.venture:hover{background:color-mix(in srgb, var(--card) 60%, transparent)}
.venture h3{position:relative; display:inline-block; transition:transform .25s ease}
.venture:hover h3{transform:translateX(4px)}
.venture h3::after{
  content:""; position:absolute; left:0; bottom:-4px; height:2px; width:0;
  background:var(--signal); transition:width .35s cubic-bezier(.2,.7,.2,1);
}
.venture:hover h3::after{width:100%}

/* cell hover: signal corner tick */
.cell{position:relative; transition:background .2s ease}
.cell:hover{background:var(--card)}
.cell::before{
  content:""; position:absolute; top:0; left:0; width:0; height:2px;
  background:var(--signal); transition:width .3s ease;
}
.cell:hover::before{width:38px}

/* stat strip count-up feel via subtle scale on load */
.hero-strip .s .n{display:inline-block}

/* live status dot pulse */
.status.live{position:relative}

@media (prefers-reduced-motion:reduce){
  *{transition:none !important; animation:none !important; scroll-behavior:auto}
  .stagger>*, .reveal{opacity:1 !important; transform:none !important}
  .beam .ray{opacity:.3; stroke-dashoffset:0}
}