/* ===========================================================
   Invisible Solar — stylesheet
   Palette
   --ink:        #0A0B0A  near-black background
   --panel:      #101B2E  deep navy-blue surface
   --panel-2:    #16233D  lighter surface
   --paper:      #F3F1E9  warm off-white text/bg
   --glass:      #9FE7DC  pale aqua "glass" accent
   --sun:        #F2B441  amber "sun" accent
   --line:       rgba(243,241,233,0.14)
   Type: 'Space Grotesk' (display) + 'Inter' (body/UI) + 'IBM Plex Mono' (data)
   =========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --ink:#0A0B0A;
  --panel:#101B2E;
  --panel-2:#16233D;
  --paper:#F3F1E9;
  --paper-dim:#C9C7BC;
  --glass:#9FE7DC;
  --sun:#F2B441;
  --line: rgba(243,241,233,0.14);
  --line-strong: rgba(243,241,233,0.28);
  --radius: 2px;
  --maxw: 1180px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important;}
}

body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:'Inter',system-ui,sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}

h1,h2,h3,h4{
  font-family:'Space Grotesk',sans-serif;
  font-weight:500;
  line-height:1.12;
  margin:0 0 .5em;
  letter-spacing:-0.01em;
}
h1{font-weight:300;}

.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  font-size:12.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--glass);
  display:inline-flex;
  align-items:center;
  gap:.6em;
}
.eyebrow::before{
  content:"";
  width:22px;height:1px;
  background:var(--glass);
  display:inline-block;
}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;}
section{position:relative;}

/* --- glass grid motif: thin mullion lines, used as a signature device --- */
.glass-grid{
  position:absolute; inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.9), transparent 85%);
  opacity:.5;
}

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:100;
  background:rgba(10,11,10,.86);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.site-header .wrap{
  display:flex; align-items:center; justify-content:space-between;
  height:104px;
}
.brand{
  display:flex; align-items:center; gap:10px;
  font-family:'Space Grotesk',sans-serif;
  font-size:19px; font-weight:600; letter-spacing:.01em;
  color:var(--paper);
}
.brand .logo-img{
  height:80px; width:auto; display:block;
}
footer .brand .logo-img{height:48px;}
.brand .mark{
  width:26px;height:26px;
  border:1px solid var(--glass);
  position:relative;
  display:inline-block;
}
.brand .mark::before{
  content:"";
  position:absolute; inset:5px;
  border:1px solid var(--sun);
}
.brand small{
  display:block;
  font-family:'IBM Plex Mono',monospace;
  font-size:9.5px; letter-spacing:.16em; color:var(--paper-dim);
  font-weight:400; text-transform:uppercase; margin-top:2px;
}

nav.main-nav{display:flex; align-items:center; gap:34px;}
nav.main-nav ul{list-style:none; display:flex; gap:30px; margin:0; padding:0;}
nav.main-nav li{position:relative;}
nav.main-nav a{
  font-size:14.5px; font-weight:500; color:var(--paper-dim);
  transition:color .15s ease;
}
nav.main-nav a:hover, nav.main-nav a.active{color:var(--paper);}
nav.main-nav .has-sub:hover .sub-menu{display:block;}
.sub-menu{
  display:none; position:absolute; top:calc(100% + 16px); left:-14px;
  background:var(--panel); border:1px solid var(--line);
  min-width:190px; padding:8px; z-index:20;
}
/* Invisible bridge over the gap above the dropdown so the mouse never
   leaves the hoverable area while moving from the nav link down into
   the menu — without this, .has-sub loses :hover mid-move and the
   dropdown closes before you can reach it. */
.sub-menu::before{
  content:"";
  position:absolute; left:0; right:0; top:-16px; height:16px;
}
.sub-menu a{display:block; padding:9px 12px; font-size:13.5px;}
.sub-menu a:hover{background:var(--panel-2); color:var(--glass);}

.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:12px 22px;
  font-family:'IBM Plex Mono',monospace;
  font-size:12.5px; letter-spacing:.08em; text-transform:uppercase;
  border:1px solid var(--paper); color:var(--paper);
  transition:all .18s ease;
  cursor:pointer; background:transparent;
}
.btn:hover{background:var(--paper); color:var(--ink);}
.btn.primary{background:var(--sun); border-color:var(--sun); color:var(--ink);}
.btn.primary:hover{background:transparent; color:var(--sun);}
.btn.ghost{border-color:var(--line-strong); color:var(--paper-dim);}
.btn.ghost:hover{border-color:var(--glass); color:var(--glass); background:transparent;}

.menu-toggle{display:none; background:none; border:none; color:var(--paper); font-size:26px; cursor:pointer;}

/* ---------- Hero ---------- */
.hero{
  padding:120px 0 100px;
  background:radial-gradient(ellipse 900px 480px at 82% -10%, rgba(159,231,220,.12), transparent 60%);
  overflow:hidden;
}
.hero .wrap{position:relative; z-index:1;}
.hero-inner{max-width:760px;}
.hero h1{font-size:clamp(38px,5.6vw,64px); color:var(--paper); margin-bottom:.35em;}
.hero h1 em{font-style:normal; color:var(--glass);}
.hero p.lede{font-size:19px; color:var(--paper-dim); max-width:540px; margin-bottom:2em;}
.hero .cta-row{display:flex; gap:14px; flex-wrap:wrap;}

/* ---------- Hero slider (homepage) ---------- */
.hero-slider{position:relative; padding:0; min-height:640px; display:flex; align-items:center;}
.hero-slide{
  position:absolute; inset:0;
  background-size:cover; background-position:center;
  opacity:0; transition:opacity 1.2s ease;
  z-index:0;
}
.hero-slide.active{opacity:1;}
.hero-slider::after{
  content:"";
  position:absolute; inset:0; z-index:1;
  background:linear-gradient(100deg, rgba(10,11,10,.94) 0%, rgba(10,11,10,.78) 42%, rgba(10,11,10,.35) 100%);
}
.hero-slider .glass-grid{z-index:2;}
.hero-slider .wrap{position:relative; z-index:3; padding:120px 28px;}
.hero-slide-text{display:none;}
.hero-slide-text.active{display:block; animation:heroFadeUp .7s ease both;}
@keyframes heroFadeUp{from{opacity:0; transform:translateY(10px);} to{opacity:1; transform:translateY(0);}}
.hero-dots{
  position:absolute; bottom:28px; left:50%; transform:translateX(-50%);
  display:flex; gap:10px; z-index:4;
}
.hero-dot{
  width:26px; height:3px; background:var(--line-strong); border:none; padding:0; cursor:pointer;
  transition:background .2s ease;
}
.hero-dot.active{background:var(--sun);}
@media (max-width:700px){.hero-slider{min-height:560px;} .hero-slider .wrap{padding:100px 22px;}}

/* ---------- Section basics ---------- */
.section{padding:96px 0;}
.section.tight{padding:64px 0;}
.section-head{max-width:640px; margin-bottom:56px;}
.section-head h2{font-size:clamp(28px,3.4vw,40px); color:var(--paper);}
.section-head p{color:var(--paper-dim); font-size:16.5px;}
.section.alt{background:var(--panel);}
.divider{height:1px; background:var(--line); border:none; margin:0;}

/* ---------- Cards / grids ---------- */
.grid{display:grid; gap:1px; background:var(--line);}
.grid.cols-4{grid-template-columns:repeat(4,1fr);}
.grid.cols-3{grid-template-columns:repeat(3,1fr);}
.grid.cols-2{grid-template-columns:repeat(2,1fr);}
@media (max-width:900px){.grid.cols-4,.grid.cols-3,.grid.cols-2{grid-template-columns:1fr;}}

.tech-card{
  background-color:var(--ink);
  padding:34px 30px;
  transition:background-color .18s ease;
  position:relative;
  overflow:hidden;
}
.section.alt .tech-card{background-color:var(--panel);}
.tech-card:hover{background-color:var(--panel-2);}
.tech-card .num{font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--sun); letter-spacing:.1em;}
.tech-card h3{font-size:21px; margin:14px 0 10px;}
.tech-card p{color:var(--paper-dim); font-size:15px; margin:0 0 16px;}
.tech-card .go{font-size:13px; color:var(--glass); font-weight:500;}

/* photo-backed variant */
.tech-card.has-bg{background-size:cover; background-position:center;}
.tech-card.has-bg::before{
  content:"";
  position:absolute; inset:0; z-index:0;
  background:linear-gradient(180deg, rgba(10,11,10,.5) 0%, rgba(10,11,10,.92) 100%);
  transition:background .18s ease;
}
.tech-card.has-bg:hover::before{
  background:linear-gradient(180deg, rgba(10,11,10,.35) 0%, rgba(10,11,10,.85) 100%);
}
.tech-card.has-bg > *{position:relative; z-index:1;}

/* article/blog pages */
.article-hero{padding:90px 0 40px;}
.article-hero .eyebrow{margin-bottom:18px;}
.article-hero h1{font-size:clamp(30px,4.4vw,46px); max-width:820px;}
.article-body{max-width:760px; padding:0 28px 40px; margin:0 auto;}
.article-body img{margin:36px 0; border:1px solid var(--line);}
.article-body h4{color:var(--glass); font-size:20px; margin-top:2.2em;}
.article-body p{color:var(--paper-dim); font-size:16.5px;}
.article-body p strong{color:var(--paper); font-weight:600;}

/* stat strip */
.stat-strip{display:flex; flex-wrap:wrap; gap:1px; background:var(--line); margin:40px 0;}
.stat{flex:1 1 160px; background:var(--panel); padding:26px 24px;}
.stat .label{font-family:'IBM Plex Mono',monospace; font-size:11px; text-transform:uppercase; letter-spacing:.1em; color:var(--paper-dim);}
.stat .value{font-family:'Space Grotesk',sans-serif; font-size:32px; color:var(--sun); margin-top:6px;}

/* feature rows w/ image */
.feature-row{display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:center;}
.feature-row.reverse .img-col{order:2;}
.feature-row img{border:1px solid var(--line);}
@media (max-width:840px){.feature-row{grid-template-columns:1fr; gap:30px;} .feature-row.reverse .img-col{order:0;}}

/* value/why cards */
.why-card{padding:30px 0; border-bottom:1px solid var(--line);}
.why-card:first-child{border-top:1px solid var(--line);}
.why-card h3{font-size:19px; margin-bottom:6px;}
.why-card p{color:var(--paper-dim); font-size:15px; margin:0;}

/* pull quote */
.pull-quote{
  padding:80px 0; text-align:center;
}
.pull-quote blockquote{
  font-family:'Space Grotesk',sans-serif;
  font-weight:300; font-size:clamp(22px,3.2vw,32px);
  max-width:820px; margin:0 auto 18px; color:var(--paper);
}
.pull-quote cite{font-style:normal; color:var(--glass); font-size:14px; font-family:'IBM Plex Mono',monospace;}

/* FAQ */
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%; text-align:left; background:none; border:none; color:var(--paper);
  font-family:'Space Grotesk',sans-serif; font-size:18px; padding:24px 0;
  display:flex; justify-content:space-between; align-items:center; cursor:pointer;
}
.faq-q .icon{font-family:'IBM Plex Mono',monospace; color:var(--glass); font-size:20px; transition:transform .2s ease;}
.faq-item.open .faq-q .icon{transform:rotate(45deg);}
.faq-a{max-height:0; overflow:hidden; transition:max-height .25s ease;}
.faq-a p{color:var(--paper-dim); padding-bottom:22px; margin:0; max-width:640px;}

/* ---------- Forms ---------- */
form.card-form{
  background:var(--panel); border:1px solid var(--line);
  padding:38px; display:grid; gap:16px;
}
form.card-form .row-2{display:grid; grid-template-columns:1fr 1fr; gap:16px;}
@media (max-width:600px){form.card-form .row-2{grid-template-columns:1fr;}}
.field label{display:block; font-family:'IBM Plex Mono',monospace; font-size:11px; letter-spacing:.08em; text-transform:uppercase; color:var(--paper-dim); margin-bottom:7px;}
.field input, .field select, .field textarea{
  width:100%; background:var(--ink); border:1px solid var(--line-strong); color:var(--paper);
  padding:12px 14px; font-family:'Inter',sans-serif; font-size:14.5px;
}
.field input:focus, .field select:focus, .field textarea:focus{outline:2px solid var(--glass); outline-offset:1px; border-color:var(--glass);}
.field textarea{min-height:110px; resize:vertical;}
.form-msg{font-size:14px; font-family:'IBM Plex Mono',monospace; padding-top:4px;}
.form-msg.ok{color:var(--glass);}
.form-msg.err{color:#e88a6a;}

/* ---------- Footer ---------- */
footer.site-footer{background:var(--panel); border-top:1px solid var(--line); padding:70px 0 30px;}
.footer-grid{display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:40px; padding-bottom:50px;}
@media (max-width:800px){.footer-grid{grid-template-columns:1fr 1fr;}}
.footer-grid h5{font-family:'IBM Plex Mono',monospace; font-size:11.5px; text-transform:uppercase; letter-spacing:.1em; color:var(--paper-dim); margin-bottom:16px;}
.footer-grid ul{list-style:none; margin:0; padding:0; display:grid; gap:10px;}
.footer-grid a{color:var(--paper-dim); font-size:14.5px;}
.footer-grid a:hover{color:var(--glass);}
.footer-grid address{font-style:normal; color:var(--paper-dim); font-size:14.5px; line-height:1.7;}
.footer-bottom{border-top:1px solid var(--line); padding-top:26px; display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px; font-size:13px; color:var(--paper-dim);}

/* utility */
.text-center{text-align:center;}
.mt-0{margin-top:0;}
.small{font-size:13px; color:var(--paper-dim);}

@media (max-width:860px){
  nav.main-nav ul, nav.main-nav .btn.ghost{display:none;}
  .menu-toggle{display:block;}
  nav.main-nav.open ul{
    display:flex; flex-direction:column; position:absolute; top:104px; left:0; right:0;
    background:var(--panel); border-bottom:1px solid var(--line); padding:16px 28px; gap:4px;
  }
  nav.main-nav.open ul a{display:block; padding:12px 0;}
  .sub-menu{position:static; display:block !important; border:none; background:none; padding:0 0 0 14px;}
}