/* ============================================================
   Tettra Energy — blue/white hydrogen & energy rebrand
   Navy → azure on white · geometric (hexagon/platonic) iconography
   ============================================================ */

:root{
  --navy:#17365d;          /* deep navy */
  --navy-2:#1e4a7a;
  --blue:#2b6cb0;          /* primary blue */
  --azure:#29abe2;         /* bright azure accent */
  --sky:#7cc6ec;           /* light sky */
  --grad:linear-gradient(120deg,#17365d 0%,#2b6cb0 50%,#29abe2 100%);
  --bg:#ffffff;
  --mist:#f4f8fc;          /* pale blue section */
  --mist-2:#e9f2fb;
  --line:#dbe7f3;
  --ink:#17283a;
  --muted:#5a6f84;
  --white:#fff;
  --shadow:0 22px 55px -28px rgba(23,54,93,.45);
  --radius:18px;
  --maxw:1180px;
  --display:"Sora",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  /* faint hexagon texture */
  --hex:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='56' height='96' viewBox='0 0 56 96'%3E%3Cpath fill='none' stroke='%232b6cb0' stroke-opacity='0.06' stroke-width='1.5' d='M28 0l28 16v32L28 64 0 48V16zM28 64l28 16v32M28 64L0 80v32'/%3E%3C/svg%3E");
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3,h4{font-family:var(--display);font-weight:600;line-height:1.1;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:.76rem;font-weight:700;letter-spacing:.22em;text-transform:uppercase;margin-bottom:16px;
  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:1.5px solid transparent;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s,border-color .2s,color .2s}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 12px 30px -12px rgba(41,171,226,.7)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 40px -12px rgba(41,171,226,.9)}
.btn-ghost{border-color:rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.14);border-color:#fff}
.btn-dark{background:var(--navy);color:#fff}
.btn-dark:hover{transform:translateY(-2px);box-shadow:var(--shadow)}

/* header */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;padding:18px 0;transition:background .3s,box-shadow .3s,padding .3s,border-color .3s;border-bottom:1px solid transparent}
.site-header.scrolled{background:rgba(255,255,255,.9);backdrop-filter:blur(12px);padding:10px 0;border-color:var(--line);box-shadow:0 6px 24px -18px rgba(23,54,93,.5)}
.nav{display:flex;align-items:center;justify-content:space-between}
.brand .logo-img{height:40px;width:auto;display:block;transition:height .3s}
.site-header.scrolled .brand .logo-img{height:34px}
.menu{display:flex;align-items:center;gap:28px;list-style:none}
.menu a{color:var(--navy);font-size:.92rem;font-weight:500;transition:color .2s;position:relative;opacity:.82}
.menu a:hover,.menu a.active{opacity:1;color:var(--blue)}
.menu a:hover::after{content:"";position:absolute;left:0;right:0;bottom:-7px;height:2px;background:var(--grad);border-radius:2px}
/* header over the light hero already reads dark; keep dark nav text */
.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:var(--navy);margin:6px 0;border-radius:2px;transition:.3s}

/* hero (light, hexagon texture) */
.hero{position:relative;min-height:94vh;display:flex;align-items:center;overflow:hidden;color:var(--ink);
  background:radial-gradient(900px 620px at 82% 12%,rgba(41,171,226,.16),transparent 60%),radial-gradient(700px 500px at 8% 90%,rgba(43,108,176,.12),transparent 60%),var(--bg)}
.hero::before{content:"";position:absolute;inset:0;background-image:var(--hex);background-size:56px 96px;opacity:.9;mask-image:radial-gradient(1000px 700px at 70% 40%,#000,transparent 78%)}
.hero .wrap{position:relative;z-index:2;padding-top:96px}
.hero-inner{max-width:820px}
.hero h1{font-size:clamp(2.7rem,6.2vw,4.8rem);margin-bottom:22px;color:var(--navy)}
.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:var(--muted);max-width:600px;margin-bottom:34px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:44px;margin-top:60px;flex-wrap:wrap}
.hero-stats .num{font-family:var(--display);font-size:1.9rem;font-weight:700;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1.1}
.hero-stats .lbl{font-size:.8rem;letter-spacing:.05em;color:var(--muted);margin-top:6px;text-transform:uppercase}

/* sections */
section{padding:98px 0}
.section-head{max-width:700px;margin-bottom:52px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head h2{font-size:clamp(2rem,4vw,2.9rem);margin-bottom:14px;color:var(--navy)}
.section-head p{color:var(--muted);font-size:1.08rem}
.bg-deep{background:var(--grad);color:#fff}
.bg-deep .section-head h2{color:#fff}
.bg-deep .section-head p{color:rgba(255,255,255,.82)}
.bg-mist2{background:var(--mist)}

/* platonic-solids divider (nod to the brand slide) */
.solid-strip{background:var(--grad);padding:22px 0}
.solid-strip .row{display:flex;align-items:center;justify-content:center;gap:min(9vw,90px);flex-wrap:wrap}
.solid-strip svg{width:40px;height:40px;opacity:.92}

/* cards */
.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.card{position:relative;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px 28px;box-shadow:0 16px 40px -30px rgba(23,54,93,.5);transition:transform .25s,border-color .25s,box-shadow .25s}
.card:hover{transform:translateY(-6px);border-color:var(--sky);box-shadow:var(--shadow)}
.card .ico{width:56px;height:56px;border-radius:15px;margin-bottom:20px;display:grid;place-items:center;color:#fff;background:var(--grad);box-shadow:0 12px 26px -12px rgba(43,108,176,.8)}
.card .ico svg{width:28px;height:28px}
.card h3{font-size:1.3rem;margin-bottom:10px;color:var(--navy)}
.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:.14;
  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(41,171,226,.3),transparent 60%),radial-gradient(480px 380px at 20% 92%,rgba(43,108,176,.24),transparent 60%),var(--grad)}
.split .visual .molecule{position:absolute;inset:0;display:grid;place-items:center}
.split .visual .badge{position:absolute;bottom:24px;left:24px;right:24px;background:rgba(255,255,255,.95);border:1px solid var(--line);border-radius:14px;padding:18px 22px}
.split .visual .badge strong{font-family:var(--display);color:var(--navy);font-size:1.05rem}
.split .visual .badge span{display:block;color:var(--muted);font-size:.9rem}
.prose p{margin-bottom:18px;color:var(--ink)}
.prose p.big{font-size:1.15rem;color:var(--navy)}
.bg-deep .prose p{color:rgba(255,255,255,.9)}
.bg-deep .prose p.big{color:#fff}

/* synergy rows */
.syn{display:flex;gap:22px;padding:26px 0;border-bottom:1px solid rgba(255,255,255,.18);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:var(--navy);background:#fff;box-shadow:0 10px 26px -14px rgba(0,0,0,.5)}
.syn .ico svg{width:26px;height:26px}
.syn h3{font-size:1.3rem;color:#fff;margin-bottom:6px}
.syn p{color:rgba(255,255,255,.8)}

/* 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:.76rem;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(--ink)}
.info-block a.v:hover{color:var(--blue)}
.email-panel{background:#fff;border:1px solid var(--line);padding:36px;border-radius:var(--radius);box-shadow:var(--shadow)}
.email-panel h3{font-family:var(--display);font-size:1.6rem;color:var(--navy);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(--blue);font-weight:600}

/* cta band */
.cta-band{position:relative;overflow:hidden;border-radius:26px;padding:60px 54px;text-align:center;color:#fff;
  background:radial-gradient(700px 400px at 15% 20%,rgba(41,171,226,.4),transparent 60%),var(--grad);box-shadow:var(--shadow)}
.cta-band h2{font-size:clamp(1.8rem,3.5vw,2.6rem);margin-bottom:14px}
.cta-band p{color:rgba(255,255,255,.9);max-width:560px;margin:0 auto 28px}

/* footer */
.site-footer{background:var(--navy);color:rgba(255,255,255,.72);padding:66px 0 28px}
.footer-top{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px;padding-bottom:44px;border-bottom:1px solid rgba(255,255,255,.14)}
.site-footer .brand{margin-bottom:16px}
.site-footer .brand .logo-img{filter:brightness(0) invert(1);opacity:.96}
.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(--azure)}
.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:#fff;font-weight:600;padding:10px 18px;border-radius:10px;transition:top .2s}
.skip-link:focus{top:12px}
:focus-visible{outline:2px solid var(--azure);outline-offset:3px;border-radius:4px}

/* reveal */
.js .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s,transform .7s}
.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
  .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(255,255,255,.98);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}
  .solid-strip .row{gap:34px}
  section{padding:66px 0}
}