/* ==========================================================================
   Tech Tribe Limited — static site
   ========================================================================== */

:root{
  --ink:#17191D;
  --ink-2:#1D2025;
  --cream:#F2F3F5;
  --cream-2:#E2E4E8;
  --accent:#D8CFC2;
  --accent-hover:#E7E0D6;
  --on-dark:#E6E8EC;
  --on-dark-muted:#9AA0A9;
  --on-light:#17191D;
  --on-light-muted:#5A6069;
  --rule-dark:rgba(230,232,236,.15);
  --rule-light:rgba(23,25,29,.13);
  --header-bg:rgba(23,25,29,.90);
  --serif:"Newsreader",Georgia,"Times New Roman",serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
  --wrap:1160px;
  --pad:clamp(20px,5vw,48px);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--cream);
  color:var(--on-light);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--pad)}
.narrow{max-width:820px}

.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:var(--ink);padding:10px 16px;z-index:100}
.skip:focus{left:8px;top:8px}

/* ---------- type ---------- */
h1,h2,h3{font-family:var(--serif);font-weight:400;letter-spacing:-.01em;margin:0}
h1{font-size:clamp(2.4rem,6vw,4.4rem);line-height:1.06}
h1 em{font-style:italic;color:var(--accent)}
h2{font-size:clamp(1.9rem,4.2vw,3.1rem);line-height:1.12}
h3{font-size:clamp(1.25rem,2.2vw,1.6rem);line-height:1.2}
p{margin:0}

.eyebrow{
  font-size:.72rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;
  color:var(--on-light-muted);margin-bottom:1.1rem;
}
.dark .eyebrow{color:var(--accent)}
.lead{font-size:clamp(1rem,1.5vw,1.15rem);max-width:56ch;color:var(--on-light-muted)}
.dark .lead{color:var(--on-dark-muted)}

/* ---------- sections ---------- */
section{position:relative;overflow:hidden}
.dark{background:var(--ink);color:var(--on-dark)}
.light{background:var(--cream);color:var(--on-light)}
.dark h1,.dark h2,.dark h3{color:var(--on-dark)}

section.light,section.dark{padding:clamp(72px,11vw,150px) 0}
.hero{padding:0}

.sec-head{margin-bottom:clamp(40px,6vw,72px)}
.sec-head h2{margin-bottom:1.2rem}

/* star field on dark sections */
.stars{
  position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:
    radial-gradient(circle, rgba(230,232,236,.85) 1px, transparent 1.4px),
    radial-gradient(circle, rgba(216,207,194,.65) 1px, transparent 1.4px);
  background-size:340px 280px, 520px 430px;
  background-position:40px 60px, 260px 200px;
}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:50;
  transition:background .3s ease,border-color .3s ease,backdrop-filter .3s ease;
  border-bottom:1px solid transparent;
}
.site-header.scrolled{
  background:var(--header-bg);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  border-bottom-color:var(--rule-dark);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo{
  font-family:var(--serif);font-size:1.35rem;letter-spacing:.01em;color:var(--on-dark);
  text-decoration:none;
}
.logo span{color:var(--accent)}
.nav{display:flex;gap:clamp(18px,3vw,34px)}
.nav a{
  color:var(--on-dark);text-decoration:none;font-size:.86rem;letter-spacing:.04em;
  opacity:.78;transition:opacity .2s,color .2s;padding:6px 0;
}
.nav a:hover{opacity:1;color:var(--accent)}

.burger{display:none;background:none;border:0;padding:10px;cursor:pointer}
.burger span{display:block;width:22px;height:1.5px;background:var(--on-dark);margin:5px 0;transition:transform .25s,opacity .25s}
.burger[aria-expanded="true"] span:first-child{transform:translateY(6.5px) rotate(45deg)}
.burger[aria-expanded="true"] span:last-child{transform:translateY(-6.5px) rotate(-45deg)}

/* ---------- hero ---------- */
.hero{
  background:var(--ink);color:var(--on-dark);
  min-height:100svh;display:flex;align-items:center;
  padding:120px 0 90px;
}
.constellation{position:absolute;inset:0;width:100%;height:100%;display:block;opacity:.85}
.hero-inner{position:relative;z-index:2;text-align:center}
.year{
  display:inline-block;border:1px solid var(--rule-dark);padding:5px 14px;
  font-size:.72rem;letter-spacing:.22em;color:var(--on-dark-muted);margin-bottom:2.2rem;
}
.hero .eyebrow{color:var(--accent)}
.hero h1{margin-bottom:1.6rem}
.hero .lead{margin:0 auto;color:var(--on-dark-muted)}

.cta-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:2.6rem}
.btn{
  display:inline-block;text-decoration:none;font-size:.86rem;font-weight:500;letter-spacing:.04em;
  padding:14px 28px;border:1px solid transparent;transition:background .2s,color .2s,border-color .2s,transform .2s;
}
.btn-primary{background:var(--accent);color:var(--ink)}
.btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px)}
.btn-ghost{border-color:var(--rule-dark);color:var(--on-dark)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}

.works-with{margin-top:4rem;display:flex;gap:18px;justify-content:center;align-items:center;flex-wrap:wrap}
.works-with .label{font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;color:var(--on-dark-muted)}
.works-with ul{display:flex;gap:10px;list-style:none;margin:0;padding:0;flex-wrap:wrap;justify-content:center}
.works-with li{
  border:1px solid var(--rule-dark);padding:6px 14px;font-size:.8rem;color:var(--on-dark);
}
.scroll-hint{
  position:absolute;bottom:26px;left:50%;transform:translateX(-50%);
  font-size:.68rem;letter-spacing:.24em;text-transform:uppercase;color:var(--on-dark-muted);z-index:2;
}
.scroll-hint::after{content:"";display:block;width:1px;height:26px;background:var(--rule-dark);margin:10px auto 0}

/* ---------- statement ---------- */
.statement{text-align:left}
.statement .glyph{color:var(--on-light);margin-bottom:clamp(36px,6vw,60px)}
.statement h2{margin-bottom:1.6rem}
.statement p{color:var(--on-light-muted);max-width:60ch}

/* ---------- services ---------- */
.service-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--rule-dark)}
.service{
  display:grid;grid-template-columns:110px 1fr;gap:clamp(16px,4vw,48px);
  padding:clamp(32px,5vw,52px) 0;border-bottom:1px solid var(--rule-dark);
}
.service .num{
  font-family:var(--serif);font-size:1.1rem;color:var(--accent);letter-spacing:.1em;padding-top:.35rem;
}
.service h3{margin-bottom:.9rem}
.service p{color:var(--on-dark-muted);max-width:58ch}
.tags{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:1.4rem 0 0;padding:0}
.tags li{
  font-size:.76rem;letter-spacing:.03em;color:var(--on-dark);
  border:1px solid var(--rule-dark);padding:5px 12px;
}

/* ---------- approach ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(20px,3vw,36px)}
.step{border-top:1px solid var(--rule-light);padding-top:22px}
.step-num{
  display:block;font-family:var(--serif);font-size:.95rem;letter-spacing:.14em;
  color:var(--on-light-muted);margin-bottom:1.4rem;
}
.step h3{margin-bottom:.7rem}
.step p{color:var(--on-light-muted);font-size:.95rem}

/* ---------- facts ---------- */
.fact-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(20px,3vw,36px)}
.fact{border-top:1px solid var(--rule-dark);padding-top:22px}
.fig{
  display:block;font-family:var(--serif);font-size:clamp(2.6rem,5vw,3.8rem);line-height:1;
  color:var(--accent);margin-bottom:1rem;
}
.fig small{font-size:.45em;vertical-align:super;letter-spacing:0}
.cap{display:block;font-size:.92rem;color:var(--on-dark-muted);max-width:22ch}

.checks{
  list-style:none;margin:clamp(44px,6vw,72px) 0 0;padding:0;
  display:flex;flex-wrap:wrap;gap:12px 34px;
}
.checks li{position:relative;padding-left:22px;font-size:.92rem;color:var(--on-dark)}
.checks li::before{
  content:"";position:absolute;left:0;top:.62em;width:8px;height:8px;
  border:1px solid var(--accent);transform:rotate(45deg);
}

/* ---------- about ---------- */
.about h2{margin-bottom:clamp(30px,5vw,48px);max-width:22ch}
.about-cols{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,48px)}
.about-cols p{color:var(--on-light-muted)}

/* ---------- contact ---------- */
.contact-inner{
  position:relative;z-index:2;
  display:grid;grid-template-columns:1.25fr 1fr;gap:clamp(36px,6vw,80px);align-items:start;
}
.contact h2{margin-bottom:1.3rem}
.contact .btn{margin-top:2.2rem}
.contact-info{margin:0;display:grid;gap:0}
.contact-info>div{
  display:grid;grid-template-columns:120px 1fr;gap:16px;
  padding:20px 0;border-top:1px solid var(--rule-dark);
}
.contact-info>div:last-child{border-bottom:1px solid var(--rule-dark)}
.contact-info dt{font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--on-dark-muted)}
.contact-info dd{margin:0;font-size:1rem}
.contact-info a{color:var(--accent);text-decoration:none;border-bottom:1px solid rgba(216,207,194,.45)}
.contact-info a:hover{border-bottom-color:var(--accent)}

/* ---------- footer ---------- */
.site-footer{background:var(--ink-2);color:var(--on-dark-muted);padding:34px 0;border-top:1px solid var(--rule-dark)}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.site-footer nav{display:flex;gap:22px;flex-wrap:wrap}
.site-footer a{text-decoration:none;font-size:.85rem;color:var(--on-dark-muted)}
.site-footer nav a:hover{color:var(--accent)}
.site-footer .logo{color:var(--on-dark);font-size:1.15rem}
.copy{font-size:.8rem}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .steps,.fact-grid{grid-template-columns:repeat(2,1fr)}
  .contact-inner{grid-template-columns:1fr}
  .about-cols{grid-template-columns:1fr}
}
@media (max-width:720px){
  .burger{display:block}
  .nav{
    position:absolute;top:70px;left:0;right:0;flex-direction:column;gap:0;
    background:var(--header-bg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
    border-bottom:1px solid var(--rule-dark);
    max-height:0;overflow:hidden;transition:max-height .3s ease;
  }
  .nav.open{max-height:280px}
  .nav a{padding:16px var(--pad);border-top:1px solid var(--rule-dark);font-size:.95rem}
  .site-header{background:var(--header-bg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
  .service{grid-template-columns:1fr;gap:10px}
  .service .num{padding-top:0}
  .steps,.fact-grid{grid-template-columns:1fr;gap:26px}
  .contact-info>div{grid-template-columns:1fr;gap:4px}
  .footer-inner{flex-direction:column;align-items:flex-start}
  .works-with{margin-top:2.6rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}