/* ============================================================
   Tettra Foundation — futuristic dark theme
   Deep space base · electric violet → cyan · glassmorphism
   ============================================================ */

:root{
  --bg:#06070f;            /* deep space */
  --bg-2:#0b0e1c;          /* raised panel */
  --glass:rgba(255,255,255,.045);
  --glass-2:rgba(255,255,255,.07);
  --line:rgba(255,255,255,.09);
  --violet:#8b5cff;
  --cyan:#2dd4ff;
  --accent:#8b5cff;
  --accent-2:#2dd4ff;
  --grad:linear-gradient(120deg,#8b5cff 0%,#5b8bff 45%,#2dd4ff 100%);
  --text:#e9edfb;
  --muted:#98a1c0;
  --white:#fff;
  --shadow:0 30px 70px -30px rgba(0,0,0,.75);
  --glow:0 0 40px -8px rgba(139,92,255,.55);
  --radius:18px;
  --maxw:1180px;
  --display:"Space Grotesk",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);color:var(--text);line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden;
  background:
    radial-gradient(900px 620px at 12% -8%,rgba(139,92,255,.20),transparent 60%),
    radial-gradient(820px 620px at 100% 0%,rgba(45,212,255,.14),transparent 55%),
    var(--bg);
  background-attachment:fixed;
}
/* faint tech grid overlay */
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(1200px 800px at 50% 0%,#000,transparent 80%);
}
body>*{position:relative;z-index:1}
h1,h2,h3,h4{font-family:var(--display);font-weight:600;line-height:1.08;letter-spacing:-.02em}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}

.eyebrow{display:inline-block;font-family:var(--sans);font-size:.74rem;font-weight:700;letter-spacing:.24em;text-transform:uppercase;margin-bottom:18px;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:10px;font-family:var(--sans);font-weight:600;font-size:.95rem;padding:14px 28px;border-radius:999px;border:1px solid transparent;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s,border-color .2s,color .2s}
.btn-primary{background:var(--grad);color:#07030f;box-shadow:0 10px 30px -12px rgba(90,139,255,.8)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 0 1px rgba(255,255,255,.15),0 16px 46px -12px rgba(45,212,255,.75)}
.btn-ghost{border-color:rgba(255,255,255,.28);color:#fff;background:rgba(255,255,255,.02)}
.btn-ghost:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.6)}
.btn-dark{background:var(--glass-2);color:#fff;border-color:var(--line)}
.btn-dark:hover{transform:translateY(-2px);border-color:rgba(139,92,255,.6);box-shadow:var(--glow)}

/* header */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;padding:20px 0;transition:background .3s,box-shadow .3s,padding .3s,border-color .3s;border-bottom:1px solid transparent}
.site-header.scrolled{background:rgba(6,7,15,.72);backdrop-filter:blur(14px);padding:12px 0;border-color:var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between}
.brand .logo-img{height:38px;width:auto;display:block;transition:height .3s;filter:drop-shadow(0 0 14px rgba(139,92,255,.35))}
.site-header.scrolled .brand .logo-img{height:33px}
.menu{display:flex;align-items:center;gap:28px;list-style:none}
.menu a{color:rgba(233,237,251,.72);font-size:.92rem;font-weight:500;transition:color .2s;position:relative}
.menu a:hover,.menu a.active{color:#fff}
.menu a:hover::after{content:"";position:absolute;left:0;right:0;bottom:-7px;height:2px;background:var(--grad);border-radius:2px}
.nav-cta{margin-left:6px}
.menu-toggle{display:none;background:none;border:none;cursor:pointer}
.menu-toggle span{display:block;width:26px;height:2px;background:#fff;margin:6px 0;border-radius:2px;transition:.3s}

/* hero */
.hero{position:relative;min-height:96vh;display:flex;align-items:center;color:#fff;overflow:hidden}
.hero::after{content:"";position:absolute;top:-20%;right:-10%;width:60vw;height:60vw;border-radius:50%;pointer-events:none;
  background:conic-gradient(from 180deg,rgba(139,92,255,.35),rgba(45,212,255,.28),rgba(91,139,255,.32),rgba(139,92,255,.35));
  filter:blur(90px);opacity:.55;animation:spin 26s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.hero .wrap{position:relative;z-index:2;padding-top:90px}
.hero-inner{max-width:820px}
.hero h1{font-size:clamp(2.7rem,6.4vw,5rem);margin-bottom:22px;letter-spacing:-.03em}
.hero h1 .accent{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(1.05rem,2vw,1.3rem);color:rgba(233,237,251,.78);max-width:620px;margin-bottom:34px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:44px;margin-top:64px;flex-wrap:wrap}
.hero-stats .num{font-family:var(--display);font-size:1.7rem;font-weight:600;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1.1}
.hero-stats .lbl{font-size:.8rem;letter-spacing:.04em;color:rgba(233,237,251,.6);margin-top:6px}

/* sections */
section{padding:100px 0}
.section-head{max-width:700px;margin-bottom:54px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head h2{font-size:clamp(2rem,4vw,3rem);margin-bottom:14px;color:#fff}
.section-head p{color:var(--muted);font-size:1.08rem}
.bg-deep{background:linear-gradient(180deg,rgba(139,92,255,.06),transparent 40%),var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.bg-mist2{background:var(--bg-2)}

/* cards (glass) */
.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.card{position:relative;overflow:hidden;background:var(--glass);border:1px solid var(--line);border-radius:var(--radius);padding:32px 28px;backdrop-filter:blur(8px);transition:transform .25s,border-color .25s,box-shadow .25s,background .25s}
.card:hover{transform:translateY(-6px);border-color:rgba(139,92,255,.5);background:var(--glass-2);box-shadow:var(--shadow),var(--glow)}
.card .ico{width:56px;height:56px;border-radius:15px;margin-bottom:20px;display:grid;place-items:center;color:#fff;
  background:linear-gradient(135deg,rgba(139,92,255,.9),rgba(45,212,255,.85));box-shadow:0 10px 26px -12px rgba(139,92,255,.9)}
.card .ico svg{width:28px;height:28px}
.card h3{font-size:1.3rem;margin-bottom:10px;color:#fff}
.card p{color:var(--muted);font-size:.98rem}
.card .num-tag{position:absolute;top:18px;right:24px;font-family:var(--display);font-size:2.9rem;line-height:1;font-weight:700;opacity:.5;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* split */
.split{display:grid;grid-template-columns:1.05fr 1fr;gap:60px;align-items:center}
.split .visual{position:relative;overflow:hidden;border-radius:var(--radius);min-height:430px;border:1px solid var(--line);box-shadow:var(--shadow);
  background:radial-gradient(500px 400px at 70% 20%,rgba(139,92,255,.4),transparent 60%),radial-gradient(500px 400px at 20% 90%,rgba(45,212,255,.32),transparent 60%),#0a0d1a}
.split .visual .molecule{position:absolute;inset:0;display:grid;place-items:center;filter:drop-shadow(0 0 26px rgba(45,212,255,.5))}
.split .visual .badge{position:absolute;bottom:24px;left:24px;right:24px;background:rgba(11,14,28,.72);border:1px solid var(--line);backdrop-filter:blur(10px);border-radius:14px;padding:18px 22px}
.split .visual .badge strong{font-family:var(--display);color:#fff;font-size:1.05rem}
.split .visual .badge span{display:block;color:var(--muted);font-size:.9rem}
.prose p{margin-bottom:18px;color:rgba(233,237,251,.82)}
.prose p.big{font-size:1.15rem;color:#fff}

/* approach rows */
.syn{display:flex;gap:22px;padding:26px 0;border-bottom:1px solid var(--line);align-items:flex-start}
.syn:last-child{border-bottom:none}
.syn .ico{flex:0 0 auto;width:52px;height:52px;border-radius:14px;display:grid;place-items:center;color:#05060d;
  background:linear-gradient(135deg,var(--violet),var(--cyan));box-shadow:0 10px 26px -12px rgba(45,212,255,.9)}
.syn .ico svg{width:26px;height:26px}
.syn h3{font-size:1.3rem;color:#fff;margin-bottom:6px}
.syn p{color:var(--muted)}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:50px;align-items:start}
.info-block{margin-bottom:26px}
.info-block .k{font-size:.74rem;letter-spacing:.2em;text-transform:uppercase;font-weight:700;margin-bottom:6px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.info-block .v{font-size:1.05rem;color:var(--text)}
.info-block a.v:hover{color:var(--cyan)}
.email-panel{background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(10px);padding:36px;border-radius:var(--radius);box-shadow:var(--shadow)}
.email-panel h3{font-family:var(--display);font-size:1.6rem;color:#fff;margin-bottom:12px}
.email-panel>p{color:var(--muted);margin-bottom:24px}
.email-actions{display:flex;flex-direction:column;gap:14px}
.email-actions .btn{justify-content:center;width:100%}
.note{font-size:.85rem;color:var(--muted);margin-top:18px}
.note a{color:var(--cyan);font-weight:600}

/* cta band */
.cta-band{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:26px;padding:60px 54px;text-align:center;color:#fff;
  background:radial-gradient(700px 400px at 15% 20%,rgba(139,92,255,.3),transparent 60%),radial-gradient(600px 400px at 90% 90%,rgba(45,212,255,.24),transparent 60%),var(--bg-2);box-shadow:var(--shadow)}
.cta-band h2{font-size:clamp(1.8rem,3.5vw,2.6rem);margin-bottom:14px}
.cta-band p{color:rgba(233,237,251,.8);max-width:560px;margin:0 auto 28px}

/* footer */
.site-footer{background:#04050c;border-top:1px solid var(--line);color:var(--muted);padding:66px 0 28px}
.footer-top{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px;padding-bottom:44px;border-bottom:1px solid var(--line)}
.site-footer .brand{margin-bottom:16px}
.site-footer p.blurb{max-width:330px;font-size:.95rem}
.footer-col h4{color:#fff;font-family:var(--sans);font-size:.78rem;letter-spacing:.18em;text-transform:uppercase;margin-bottom:16px}
.footer-col a{display:block;padding:6px 0;font-size:.95rem;transition:color .2s}
.footer-col a:hover{color:var(--cyan)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:24px;font-size:.85rem;flex-wrap:wrap;gap:12px}

/* accessibility */
.skip-link{position:absolute;left:12px;top:-60px;z-index:200;background:var(--grad);color:#07030f;font-weight:600;padding:10px 18px;border-radius:10px;transition:top .2s}
.skip-link:focus{top:12px}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}

/* reveal (progressive enhancement — only hide when JS is available) */
.js .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s,transform .7s}
.js .reveal.in{opacity:1;transform:none}

/* respect reduced-motion preferences */
@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
  .hero::after{animation:none}
  .js .reveal{opacity:1;transform:none}
}

/* responsive */
@media (max-width:940px){.grid-3{grid-template-columns:repeat(2,1fr)}.split,.contact-grid{grid-template-columns:1fr;gap:40px}.footer-top{grid-template-columns:1fr 1fr}}
@media (max-width:720px){
  .menu{display:none}
  .menu-toggle{display:block}
  .menu.open{display:flex;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:rgba(6,7,15,.97);border-bottom:1px solid var(--line);padding:24px 28px;gap:18px;align-items:flex-start}
  .nav-cta{display:none}
  .grid-3{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .cta-band{padding:46px 26px}
  section{padding:68px 0}
}