/* AIR AI LAB — Static Template
 * Monochrome design system, Inter typography, mobile-first.
 */

/* Reset */
*,*::before,*::after{box-sizing:border-box}
*{margin:0;padding:0}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{font-family:'Inter',ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:1.5;color:var(--foreground);background:var(--background);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
input,textarea,select{font:inherit;color:inherit}
ul{list-style:none}

/* Tokens */
:root{
  --background:#ffffff;
  --foreground:#000000;
  --muted:#f4f4f5;
  --muted-foreground:#6b7280;
  --secondary:#f5f5f5;
  --border:#e5e7eb;
  --radius:6px;
  --container:1200px;
  --shadow-lg:0 10px 30px -10px rgba(0,0,0,.15);
}

/* Typography */
h1,h2,h3,h4{font-weight:600;letter-spacing:-.02em;line-height:1.1}
h1{font-size:clamp(2.25rem,5vw,3.75rem)}
h2{font-size:clamp(1.75rem,3.5vw,2.5rem)}
h3{font-size:1.25rem}
p{color:var(--foreground)}
.muted{color:var(--muted-foreground)}
.text-balance{text-wrap:balance}
.eyebrow{display:inline-flex;align-items:center;gap:.5rem;font-size:11px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--muted-foreground)}
.eyebrow::before{content:"";display:inline-block;width:1.5rem;height:1px;background:var(--foreground)}

/* Layout */
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 1.5rem}
.section{padding:6rem 0}
.section-tight{padding:4rem 0}
.section-alt{background:rgba(245,245,245,.4);border-block:1px solid var(--border)}
.section-heading{max-width:48rem}
.section-heading.center{margin-inline:auto;text-align:center}
.section-heading h2{margin-top:1rem}
.section-heading p{margin-top:1rem;font-size:1.05rem;color:var(--muted-foreground)}

/* Grid backgrounds */
.grid-bg{
  background-image:linear-gradient(rgba(0,0,0,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(0,0,0,.06) 1px,transparent 1px);
  background-size:48px 48px;
}
.radial-fade{mask-image:radial-gradient(ellipse 80% 60% at 50% 30%,#000 30%,transparent 80%);
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 30%,#000 30%,transparent 80%);}

/* Header */
.site-header{position:fixed;inset:0 0 auto 0;z-index:50;transition:background .3s,border-color .3s,backdrop-filter .3s}
.site-header.scrolled{background:rgba(255,255,255,.8);backdrop-filter:saturate(180%) blur(16px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;height:4rem}
.brand{display:flex;align-items:center;gap:.5rem}
.brand img{height:1.5rem;width:auto}
.nav-list{display:none;align-items:center;gap:2rem}
.nav-link{font-size:.875rem;color:var(--muted-foreground);transition:color .15s}
.nav-link:hover,.nav-link.active{color:var(--foreground)}
.has-dropdown{position:relative}
.has-dropdown > .nav-link{display:inline-flex;align-items:center;gap:.25rem}
.dropdown{position:absolute;left:50%;top:100%;transform:translateX(-50%);min-width:20rem;padding-top:.75rem;opacity:0;pointer-events:none;transition:opacity .15s}
.has-dropdown:hover .dropdown,.has-dropdown:focus-within .dropdown{opacity:1;pointer-events:auto}
.dropdown-inner{background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-lg);overflow:hidden}
.dropdown-head{display:block;padding:.75rem 1rem;font-size:11px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--muted-foreground);border-bottom:1px solid var(--border)}
.dropdown-item{display:block;padding:.75rem 1rem;font-size:.875rem;transition:background .15s}
.dropdown-item:hover{background:var(--secondary)}
.dropdown-item .ttl{font-weight:500}
.dropdown-item .sub{margin-top:.125rem;font-size:.75rem;color:var(--muted-foreground);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:18rem}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;height:2.75rem;padding:0 1.25rem;font-size:.875rem;font-weight:500;border-radius:var(--radius);transition:opacity .15s,background .15s,border-color .15s}
.btn-sm{height:2.25rem;padding:0 1rem}
.btn-lg{height:3rem;padding:0 1.5rem}
.btn-primary{background:var(--foreground);color:var(--background)}
.btn-primary:hover{opacity:.9}
.btn-outline{border:1px solid var(--border);background:#fff}
.btn-outline:hover{background:var(--secondary)}

/* Mobile nav */
.menu-btn{display:inline-flex;align-items:center;justify-content:center;width:2.5rem;height:2.5rem;margin-right:-.5rem}
.menu-btn svg{width:1.25rem;height:1.25rem}
.mobile-nav{display:none;background:#fff;border-top:1px solid var(--border)}
.mobile-nav.open{display:block}
.mobile-nav-inner{padding:1rem 1.5rem;display:flex;flex-direction:column}
.mobile-nav a{padding:.75rem 0;font-size:.875rem;color:var(--foreground)}
.mobile-sub{margin:.25rem 0 .5rem .75rem;padding-left:.75rem;border-left:1px solid var(--border)}
.mobile-sub a{color:var(--muted-foreground)}
.mobile-cta{margin-top:.5rem;height:2.5rem;background:var(--foreground);color:var(--background);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;font-size:.875rem;font-weight:500}

/* Hero */
.hero{position:relative;border-bottom:1px solid var(--border);overflow:hidden}
.hero-bg{position:absolute;inset:0;opacity:.6}
.hero-inner{position:relative;padding:8rem 0 5rem}
.hero h1{max-width:60rem;margin-top:1.5rem}
.hero p{max-width:40rem;margin-top:1.5rem;font-size:1.125rem;color:var(--muted-foreground)}
.hero-cta{margin-top:2.5rem;display:flex;flex-wrap:wrap;gap:.75rem}

/* Stats */
.stat-grid{display:grid;gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.stat-grid > *{background:#fff;padding:2rem}
.stat-value{font-size:clamp(2rem,4vw,3rem);font-weight:600;letter-spacing:-.02em}
.stat-label{margin-top:.75rem;color:var(--muted-foreground);font-size:.875rem}

/* Cards (services / use cases / process) */
.card-grid{display:grid;gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.card{background:#fff;padding:1.75rem;display:flex;flex-direction:column;transition:background .15s}
.card.linkable:hover{background:var(--secondary)}
.card .num{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.75rem;color:var(--muted-foreground)}
.card .title{margin-top:2rem;font-size:1.5rem;font-weight:600;letter-spacing:-.02em}
.card .desc{margin-top:.5rem;font-size:.9375rem;color:var(--muted-foreground)}
.card.compact .title{margin-top:1.25rem;font-size:1rem}
.card.compact .desc{font-size:.875rem}

/* Two-column list */
.two-col{display:grid;gap:3rem}
.bullet-list{margin-top:1.5rem;display:flex;flex-direction:column;gap:.75rem}
.bullet-list li{display:flex;align-items:flex-start;gap:.75rem;font-size:.9375rem}
.bullet-list .dot{margin-top:.5rem;width:.375rem;height:.375rem;border-radius:999px;background:var(--foreground);flex:0 0 auto}
.bullet-list .check{margin-top:.25rem;width:1rem;height:1rem;flex:0 0 auto}

/* Tags / pills */
.tags{margin-top:1.5rem;display:flex;flex-wrap:wrap;gap:.5rem}
.tag{padding:.375rem .75rem;font-size:.75rem;font-weight:500;border:1px solid var(--border);border-radius:999px;color:rgba(0,0,0,.8)}
.tag.soft{background:var(--secondary);border-color:transparent}

/* FAQ */
.faq{margin-top:3rem;background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.faq details{padding:1.5rem;border-bottom:1px solid var(--border)}
.faq details:last-child{border-bottom:0}
.faq summary{display:flex;align-items:center;justify-content:space-between;font-weight:500;cursor:pointer;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary .icon{font-size:1.25rem;color:var(--muted-foreground);transition:transform .2s}
.faq details[open] summary .icon{transform:rotate(45deg)}
.faq details p{margin-top:.75rem;color:var(--muted-foreground);font-size:.9375rem}

/* Engagement / pricing */
.pricing-grid{margin-top:3rem;display:grid;gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.price-card{background:#fff;padding:2rem;display:flex;flex-direction:column}
.price-card .name{font-weight:600}
.price-card .price{margin-top:.5rem;font-size:1.5rem;font-weight:600;letter-spacing:-.02em}
.price-card .desc{margin-top:.75rem;font-size:.875rem;color:var(--muted-foreground)}
.price-card .feat{margin-top:1.5rem;padding-top:1.5rem;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:.5rem}
.price-card .feat li{display:flex;gap:.5rem;font-size:.875rem;align-items:flex-start}
.price-card .feat .check{width:.875rem;height:.875rem;margin-top:.25rem;flex:0 0 auto}

/* Marquee */
.marquee{overflow:hidden;border-block:1px solid var(--border);padding:1.75rem 0;background:var(--background)}
.marquee-track{display:flex;gap:3rem;width:max-content;animation:marquee 40s linear infinite}
.marquee-item{font-size:.875rem;color:var(--muted-foreground);white-space:nowrap}
@keyframes marquee{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* CTA */
.cta{padding:6rem 0;border-block:1px solid var(--border);background:#000;color:#fff;text-align:center}
.cta h2{color:#fff}
.cta p{color:rgba(255,255,255,.7);max-width:36rem;margin:1rem auto 0}
.cta-actions{margin-top:2rem;display:flex;flex-wrap:wrap;gap:.75rem;justify-content:center}
.cta .btn-primary{background:#fff;color:#000}
.cta .btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.3)}
.cta .btn-outline:hover{background:rgba(255,255,255,.1)}

/* Forms */
.form{display:grid;gap:1.25rem;max-width:36rem}
.field{display:flex;flex-direction:column;gap:.375rem}
.field label{font-size:.75rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--muted-foreground)}
.field input,.field textarea,.field select{height:2.75rem;padding:0 .875rem;border:1px solid var(--border);border-radius:var(--radius);background:#fff;transition:border-color .15s}
.field textarea{height:auto;padding:.75rem .875rem;min-height:7rem;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--foreground)}
.form-row{display:grid;gap:1.25rem}
.notice{padding:.875rem 1rem;background:var(--secondary);border-left:3px solid var(--foreground);border-radius:var(--radius);font-size:.875rem}

/* Footer */
.site-footer{border-top:1px solid var(--border);background:#fff}
.footer-grid{padding:4rem 0;display:grid;gap:3rem}
.footer-brand p{margin-top:1rem;max-width:18rem;color:var(--muted-foreground);font-size:.875rem}
.footer-col h4{font-size:11px;font-weight:600;letter-spacing:.18em;text-transform:uppercase}
.footer-col ul{margin-top:1rem;display:flex;flex-direction:column;gap:.75rem}
.footer-col a{font-size:.875rem;color:var(--muted-foreground);transition:color .15s}
.footer-col a:hover{color:var(--foreground)}
.footer-bottom{padding:2rem 0;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:1rem;font-size:.75rem;color:var(--muted-foreground)}

/* Animations */
@keyframes rise{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
.animate-rise{animation:rise .7s ease-out}
.delay-1{animation-delay:.1s}
.delay-2{animation-delay:.2s}
.delay-3{animation-delay:.3s}

/* Responsive */
@media(min-width:640px){
  .two-col{grid-template-columns:1fr 1fr}
  .stat-grid{grid-template-columns:repeat(3,1fr)}
  .pricing-grid{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:2fr 1fr 1fr 1fr}
  .footer-bottom{flex-direction:row;align-items:center;justify-content:space-between}
  .form-row{grid-template-columns:1fr 1fr}
}
@media(min-width:768px){
  .nav-list{display:flex}
  .menu-btn{display:none}
  .card-grid.cols-2{grid-template-columns:repeat(2,1fr)}
  .card-grid.cols-3{grid-template-columns:repeat(3,1fr)}
  .hero-inner{padding:9rem 0 7rem}
  .section{padding:8rem 0}
}
@media(min-width:1024px){
  .card-grid.cols-3{grid-template-columns:repeat(3,1fr)}
  .card-grid.cols-4{grid-template-columns:repeat(4,1fr)}
}

/* Reduce motion */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:0!important;transition-duration:0!important}
}

/* Utilities */
.center{text-align:center}
.mt-2{margin-top:.5rem}.mt-4{margin-top:1rem}.mt-6{margin-top:1.5rem}.mt-8{margin-top:2rem}.mt-10{margin-top:2.5rem}
.flex{display:flex}.gap-2{gap:.5rem}.gap-4{gap:1rem}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.video-container {
    position: relative;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    aspect-ratio: 16 / 9;
}

.video-container iframe {
    width: 100%;
    height: 100%;
    border: 0;
    border-radius: 12px;
}