/* ============================================================
   YATHARTHA LABS — EDUCATION — design tokens
   ============================================================ */
:root{
  --paper:      #fbfaf7;
  --paper-2:    #f2f0ea;
  --night:      #0d2b3e;
  --night-2:    #123c53;
  --teal:       #0f8a80;
  --teal-hi:    #16b3a6;
  --teal-soft:  rgba(15,138,128,0.09);
  --sun:        #e8a33d;
  --ink:        #17242c;
  --ink-mut:    #5d707c;
  --ink-faint:  #93a3ad;
  --line:       rgba(13,43,62,0.12);
  --line-soft:  rgba(13,43,62,0.07);
  --maxw:       1600px;
  --ease:       cubic-bezier(.22,.61,.36,1);

  --disp:'Fraunces',Georgia,serif;
  --body:'Public Sans',system-ui,sans-serif;
  --mono:'IBM Plex Mono',monospace;
}

*{box-sizing:border-box; margin:0; padding:0;}
html{scroll-behavior:smooth;}
body{
  background:var(--paper); color:var(--ink);
  font-family:var(--body); font-size:16px; line-height:1.65;
  -webkit-font-smoothing:antialiased; overflow-x:hidden;
}
::selection{ background:var(--sun); color:var(--night); }
a{ color:inherit; text-decoration:none; }
img{max-width:100%; display:block;}
:focus-visible{ outline:2.5px solid var(--teal); outline-offset:3px; }

/* ---------- typographic roles ---------- */
h1,h2,h3{ font-family:var(--disp); font-weight:600; line-height:1.06;
          letter-spacing:-0.015em; color:var(--night); }
.mono{ font-family:var(--mono); }

/* card headings read as body-font subheads, not display serif */
.why-card h3,.kit h3,.concept h3,.step h3{
  font-family:var(--body); font-weight:600; color:var(--night);
  line-height:1.4; letter-spacing:0;
}

.eyebrow{
  font-family:var(--mono); font-size:0.72rem; font-weight:500;
  letter-spacing:0.2em; text-transform:uppercase; color:var(--teal);
  display:inline-flex; align-items:center; gap:11px;
}
.eyebrow::before{ content:''; width:22px; height:2px; background:var(--sun); }
.eyebrow-sun{ color:var(--sun); }

.wrap{ width:90%; max-width:var(--maxw); margin:0 auto; position:relative; }

/* skip link — first tab stop on the page */
.skip{
  position:absolute; left:-9999px; top:0; z-index:200;
  background:var(--night); color:#fff; padding:12px 20px;
  border-radius:0 0 10px 0; font-size:0.88rem; font-weight:600;
}
.skip:focus{ left:0; }

/* ---------------- buttons ---------------- */
.btn{
  display:inline-flex; align-items:center; gap:10px; padding:14px 26px; border-radius:999px;
  font-size:0.9rem; font-weight:600; cursor:pointer; border:1.5px solid transparent;
  transition:all .25s var(--ease); white-space:nowrap;
}
.btn-primary{ background:var(--teal); color:#fff; }
.btn-primary:hover{ background:var(--night); transform:translateY(-2px); box-shadow:0 12px 28px -12px var(--night); }
.btn-ghost{ border-color:var(--line); color:var(--night); }
.btn-ghost:hover{ border-color:var(--teal); color:var(--teal); }
.btn-sun{ background:var(--sun); color:var(--night); }
.btn-sun:hover{ background:#f2b455; transform:translateY(-2px); }
.btn .arw{ transition:transform .25s var(--ease); }
.btn:hover .arw{ transform:translateX(4px); }

/* ---------------- header ---------------- */
header{ position:fixed; inset:0 0 auto 0; z-index:100; background:rgba(251,250,247,0.82);
        backdrop-filter:blur(14px); border-bottom:1px solid var(--line-soft); }
nav{ width:90%; max-width:var(--maxw); margin:0 auto; height:72px;
     display:flex; align-items:center; justify-content:space-between; gap:20px; }
.brand{ display:flex; align-items:center; gap:11px; }
.brand-mark{ width:34px; height:auto; flex-shrink:0; color:var(--teal); }
.brand-txt{ line-height:1.1; }
.brand-name{ font-family:var(--disp); font-weight:700; font-size:1.06rem; color:var(--night); }
.brand-sub{ font-family:var(--mono); font-size:0.56rem; letter-spacing:0.16em;
            text-transform:uppercase; color:var(--teal); }
.navlinks{ display:flex; gap:30px; align-items:center; }
.navlinks a{ font-size:0.88rem; font-weight:500; color:var(--ink-mut); transition:color .2s; }
.navlinks a:hover{ color:var(--teal); }
.nav-cta{ background:var(--night); color:#fff !important; padding:10px 20px; border-radius:999px; font-weight:600; }
.nav-cta:hover{ background:var(--teal); }

/* burger — only ever visible on narrow screens */
.burger{
  display:none; flex-direction:column; justify-content:center; gap:5px;
  width:42px; height:42px; padding:0 9px; background:none; border:0; cursor:pointer;
}
.burger span{ display:block; height:2px; width:100%; background:var(--night);
              border-radius:2px; transition:transform .3s var(--ease), opacity .2s; }
.burger[aria-expanded="true"] span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2){ opacity:0; }
.burger[aria-expanded="true"] span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

/* ---------------- hero ---------------- */
.hero{ padding:150px 0 90px; position:relative; overflow:hidden; }
.hero::before{ content:''; position:absolute; inset:0;
  background:radial-gradient(ellipse 70% 60% at 78% 40%, var(--teal-soft), transparent 70%); }
.hero-grid{ display:grid; grid-template-columns:1.05fr 0.95fr; gap:56px; align-items:center;
            position:relative; z-index:2; }
.hero h1{ font-size:clamp(2.6rem,5.4vw,4.1rem); margin:22px 0 20px; }
.hero h1 .tealw{ color:var(--teal); font-style:italic; }
.hero p.lede{ color:var(--ink-mut); font-size:1.12rem; max-width:520px; }
.hero-ctas{ display:flex; gap:13px; margin-top:34px; flex-wrap:wrap; }
.badges{ display:flex; flex-wrap:wrap; gap:8px; margin-top:38px; list-style:none; }
.badge{ font-family:var(--mono); font-size:0.68rem; letter-spacing:0.08em;
        text-transform:uppercase; color:var(--night); background:var(--paper-2);
        border:1px solid var(--line-soft); border-radius:999px; padding:6px 13px; }

/* signature: the orrery */
.orrery{ position:relative; aspect-ratio:1/1; max-width:460px; margin-left:auto; width:100%; }
.orrery svg{ width:100%; height:100%; overflow:visible; }
.orb-1{ transform-origin:250px 250px; animation:orbit 18s linear infinite; }
.orb-2{ transform-origin:250px 250px; animation:orbit 30s linear infinite; }
.orb-3{ transform-origin:250px 250px; animation:orbit 46s linear infinite; }
@keyframes orbit{ to{ transform:rotate(360deg); } }
.sun-core{ animation:glow 4s ease-in-out infinite; transform-origin:center; }
@keyframes glow{ 50%{ opacity:.75; } }
.drone-fly{ animation:fly 30s linear infinite; transform-origin:250px 250px; }
@keyframes fly{ to{ transform:rotate(-360deg); } }

/* ---------------- trust strip ---------------- */
.strip{ background:var(--night); color:#fff; padding:22px 0; }
.strip-in{ display:flex; align-items:center; justify-content:center; gap:14px 40px; flex-wrap:wrap;
           font-family:var(--mono); font-size:0.74rem; letter-spacing:0.14em;
           text-transform:uppercase; color:rgba(255,255,255,0.72); text-align:center; }
.strip-in b{ color:var(--sun); font-weight:500; }

/* ---------------- sections ---------------- */
section{ padding:104px 0; position:relative; }
.sec-head{ max-width:660px; margin-bottom:52px; }
.sec-head h2{ font-size:clamp(2rem,4vw,2.9rem); margin-top:18px; }
.sec-head p{ color:var(--ink-mut); margin-top:18px; font-size:1.05rem; }
.alt{ background:var(--paper-2); }

/* ---------------- why ---------------- */
.why-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.why-card{ background:var(--paper); border:1px solid var(--line-soft); border-radius:16px;
           padding:28px 24px; transition:transform .3s var(--ease), box-shadow .3s var(--ease); }
.alt .why-card{ background:var(--paper); }
.why-card:hover{ transform:translateY(-4px); box-shadow:0 16px 34px -20px rgba(13,43,62,0.4); }
.why-ico{ width:40px; height:40px; border-radius:11px; background:var(--teal-soft);
          display:grid; place-items:center; margin-bottom:16px; }
.why-ico svg{ width:21px; height:21px; stroke:var(--teal); fill:none; stroke-width:1.7;
              stroke-linecap:round; stroke-linejoin:round; }
.why-card h3{ font-size:1.02rem; margin-bottom:7px; }
.why-card p{ font-size:0.9rem; color:var(--ink-mut); }

/* ---------------- program split ---------------- */
.prog{ display:grid; grid-template-columns:1fr 1fr; gap:24px; }
.prog-card{ border-radius:20px; padding:40px 36px; position:relative; overflow:hidden;
            display:flex; flex-direction:column; }
.prog-a{ background:var(--night); color:#fff; }
.prog-b{ background:#fff; border:1px solid var(--line); }
.prog-card .kicker{ font-family:var(--mono); font-size:0.68rem; letter-spacing:0.18em;
                    text-transform:uppercase; }
.prog-a .kicker{ color:var(--sun); }
.prog-b .kicker{ color:var(--teal); }
.prog-card h3{ font-size:1.9rem; margin:14px 0 12px; }
.prog-a h3{ color:#fff; }
.prog-card > p{ font-size:0.98rem; margin-bottom:24px; }
.prog-a > p{ color:rgba(255,255,255,0.72); }
.prog-b > p{ color:var(--ink-mut); }
.prog-list{ list-style:none; margin-bottom:28px; flex:1; }
.prog-list li{ display:flex; gap:11px; padding:8px 0; font-size:0.92rem; align-items:flex-start; }
.prog-a .prog-list li{ color:rgba(255,255,255,0.85); }
.prog-b .prog-list li{ color:var(--ink-mut); }
.tick{ width:16px; height:16px; flex-shrink:0; margin-top:4px;
       fill:none; stroke-width:2.4; stroke-linecap:round; stroke-linejoin:round; }
.prog-a .tick{ stroke:var(--sun); }
.prog-b .tick{ stroke:var(--teal); }
.prog-card .btn{ align-self:flex-start; }

/* ---------------- kits ---------------- */
.kits{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.kit{ background:#fff; border:1px solid var(--line-soft); border-radius:16px; padding:26px 22px;
      position:relative; transition:border-color .3s, transform .3s var(--ease); }
.kit:hover{ border-color:var(--teal); transform:translateY(-4px); }
.kit-n{ font-family:var(--mono); font-size:0.7rem; color:#fff; background:var(--night);
        width:24px; height:24px; border-radius:50%; display:grid; place-items:center; margin-bottom:16px;
        transition:background .3s; }
.kit:hover .kit-n{ background:var(--teal); }
.kit h3{ font-size:1.02rem; margin-bottom:6px; }
.kit .contents{ font-size:0.88rem; color:var(--ink-mut); }
.kit-inc{ margin-top:52px; border:1px solid var(--line-soft); border-radius:16px; background:#fff;
          padding:26px 30px; display:flex; align-items:center; gap:16px 34px; flex-wrap:wrap; }
.kit-inc .lab{ font-family:var(--mono); font-size:0.68rem; letter-spacing:0.14em;
               text-transform:uppercase; color:#fff; background:var(--teal); border-radius:999px;
               padding:8px 15px; flex-shrink:0; }
.kit-inc span.item{ font-size:0.88rem; color:var(--ink-mut); display:flex; align-items:center; gap:8px; }
.kit-inc span.item::before{ content:''; width:5px; height:5px; border-radius:50%; background:var(--sun); }

/* ---------------- lab tiers ---------------- */
.tiers{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; align-items:stretch; }
.tier{ background:#fff; border:1px solid var(--line-soft); border-radius:20px; padding:34px 30px;
       position:relative; display:flex; flex-direction:column; height:100%; }
.tier.featured{ border-color:var(--teal); box-shadow:0 20px 44px -26px rgba(15,138,128,0.55); }
.tier-flag{ position:absolute; top:-11px; left:30px; background:var(--teal); color:#fff;
            font-family:var(--mono); font-size:0.62rem; letter-spacing:0.14em;
            text-transform:uppercase; padding:5px 12px; border-radius:999px; }
.tier h3{ font-size:1.34rem; }
.tier .scope{ font-family:var(--mono); font-size:0.7rem; letter-spacing:0.08em;
              color:var(--teal); text-transform:uppercase; margin-top:8px; display:block; }
.tier .hero-item{ margin:20px 0; padding:14px 16px; background:var(--paper-2); border-radius:11px;
                  font-size:0.88rem; color:var(--night); font-weight:600; }
.tier ul{ list-style:none; flex:1; }
.tier ul li{ font-size:0.88rem; color:var(--ink-mut); padding:6px 0; display:flex; gap:9px; align-items:flex-start; }
.tier ul li::before{ content:'+'; color:var(--teal); font-weight:700; flex-shrink:0; }
.tier .more{ margin-top:14px; font-size:0.82rem; color:var(--ink-faint); font-style:italic; }

/* ---------------- concepts ---------------- */
.concepts{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line-soft);
           border:1px solid var(--line-soft); border-radius:18px; overflow:hidden; }
.concept{ background:var(--paper); padding:30px 28px; transition:background .3s; }
.alt .concept{ background:var(--paper-2); }
.concept:hover{ background:#fff; }
.concept .num{ font-family:var(--mono); font-size:0.7rem; color:var(--teal); }
.concept h3{ font-size:1.05rem; margin:10px 0 8px; }
.concept p{ font-size:0.89rem; color:var(--ink-mut); }

/* ---------------- outcomes ---------------- */
.outcome-wrap{ display:grid; grid-template-columns:0.9fr 1.1fr; gap:60px; align-items:center; }
.h2-sm{ font-size:clamp(1.9rem,3.6vw,2.6rem); margin-top:18px; }
.outcome-lede{ color:var(--ink-mut); margin:18px 0 28px; }
.gains{ display:flex; flex-wrap:wrap; gap:10px; list-style:none; }
.gain{ border:1px solid var(--line); border-radius:999px; padding:9px 17px; font-size:0.86rem;
       color:var(--night); background:#fff; transition:all .25s var(--ease); }
.gain:hover{ background:var(--night); color:#fff; border-color:var(--night); }
.bene{ list-style:none; margin-top:24px; }
.bene li{ display:flex; gap:13px; padding:14px 0; border-top:1px solid var(--line-soft);
          font-size:0.95rem; color:var(--ink-mut); align-items:flex-start; }
.bene li:first-child{ border-top:none; }
.bene li b{ color:var(--night); font-weight:600; }

/* ---------------- setup steps ---------------- */
.steps{ display:grid; grid-template-columns:repeat(4,1fr); gap:0; margin-top:8px; list-style:none; }
.step{ padding:0 26px 0 0; position:relative; }
.step .dot{ display:block; width:13px; height:13px; border-radius:50%; background:var(--teal);
            position:relative; z-index:2; }
.step .bar{ position:absolute; top:6px; left:13px; right:0; height:1px; background:var(--line); }
.step:last-child .bar{ display:none; }
.step h3{ font-size:1rem; margin:18px 0 7px; }
.step p{ font-size:0.88rem; color:var(--ink-mut); }

/* ---------------- CTA ---------------- */
.cta{ background:var(--night); color:#fff; padding:96px 0; position:relative; overflow:hidden; }
.cta::before{ content:''; position:absolute; inset:0;
  background:radial-gradient(ellipse 50% 70% at 82% 50%, rgba(15,138,128,0.35), transparent 70%); }
.cta-grid{ display:grid; grid-template-columns:1.1fr 0.9fr; gap:56px; align-items:center;
           position:relative; z-index:2; }
.cta h2{ color:#fff; font-size:clamp(2rem,4vw,2.9rem); margin-top:18px; }
.cta p.sub{ color:rgba(255,255,255,0.7); margin-top:18px; font-size:1.05rem; max-width:440px; }
.cta-ctas{ display:flex; gap:13px; margin-top:32px; flex-wrap:wrap; }
.cta-ghost{ border:1.5px solid rgba(255,255,255,0.3); color:#fff; }
.cta-ghost:hover{ border-color:var(--sun); color:var(--sun); }
.contact-card{ background:rgba(255,255,255,0.05); border:1px solid rgba(255,255,255,0.12);
               border-radius:18px; padding:32px; }
.contact-card .lab{ font-family:var(--mono); font-size:0.66rem; letter-spacing:0.16em;
                    text-transform:uppercase; color:var(--sun); }
.crow{ display:flex; gap:14px; align-items:center; padding:15px 0; border-top:1px solid rgba(255,255,255,0.1); }
.crow:first-of-type{ border-top:none; margin-top:14px; }
.crow svg{ width:17px; height:17px; stroke:var(--sun); fill:none; stroke-width:1.7; flex-shrink:0;
           stroke-linecap:round; stroke-linejoin:round; }
.crow a, .crow span{ font-size:0.95rem; color:rgba(255,255,255,0.9); }
.crow a:hover{ color:var(--sun); }

/* ---------------- footer ---------------- */
footer{ padding:40px 0; background:var(--night); border-top:1px solid rgba(255,255,255,0.1); }
.foot{ display:flex; justify-content:space-between; align-items:center; gap:18px; flex-wrap:wrap; }
.foot-mark{ width:20px; height:auto; color:rgba(255,255,255,0.45); flex-shrink:0; }
.foot-l{ display:flex; align-items:center; gap:11px; color:rgba(255,255,255,0.5);
         font-family:var(--mono); font-size:0.74rem; }
.foot-tag{ font-family:var(--mono); font-size:0.68rem; letter-spacing:0.16em;
           text-transform:uppercase; color:var(--teal-hi); text-align:right; }

/* ---------------- reveal ---------------- */
.reveal{ opacity:0; transform:translateY(20px); transition:opacity .75s var(--ease), transform .75s var(--ease); }
.reveal.in{ opacity:1; transform:none; }

/* ---------------- responsive ---------------- */
@media (max-width:1000px){
  .why-grid,.kits{ grid-template-columns:repeat(2,1fr); }
  .concepts{ grid-template-columns:repeat(2,1fr); }
  .steps{ grid-template-columns:repeat(2,1fr); gap:32px 0; }
  .step .bar{ display:none; }
}
@media (max-width:900px){
  .burger{ display:flex; }
  .navlinks{
    position:absolute; top:72px; left:0; right:0;
    flex-direction:column; align-items:stretch; gap:0;
    background:var(--paper); border-bottom:1px solid var(--line-soft);
    padding:8px 20px 20px;
    box-shadow:0 18px 34px -22px rgba(13,43,62,0.5);
    /* collapsed by default; JS toggles .open */
    display:none;
  }
  .navlinks.open{ display:flex; }
  .navlinks a{ padding:14px 4px; font-size:0.98rem; border-top:1px solid var(--line-soft); }
  .navlinks a:first-child{ border-top:none; }
  .nav-cta{ margin-top:14px; text-align:center; border-top:none !important; }
  .hero-grid,.outcome-wrap,.cta-grid{ grid-template-columns:1fr; }
  .orrery{ max-width:380px; margin:0 auto; }
  .prog,.tiers{ grid-template-columns:1fr; }
}
@media (max-width:600px){
  section{ padding:72px 0; }
  .why-grid,.kits,.concepts{ grid-template-columns:1fr; }
  .steps{ grid-template-columns:1fr; }
  .brand-sub{ display:none; }
  .foot{ justify-content:center; text-align:center; }
  .foot-tag{ text-align:center; }
}
@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  .orb-1,.orb-2,.orb-3,.sun-core,.drone-fly{ animation:none !important; }
  .reveal{ transition:none; opacity:1; transform:none; }
  *{ transition-duration:.01ms !important; }
}