/* ============================================================
   AirNet — Main Stylesheet
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Exo+2:wght@600;700;800;900&family=Inter:wght@400;500;600;700&display=swap');

:root {
  --blue:       #406FE6;
  --blue-dark:  #2d59cc;
  --dark:       #14181e;
  --dark-2:     #1e2530;
  --charcoal:   #2d3340;
  --gray:       #555962;
  --gray-lt:    #8a8f9a;
  --light:      #F2F4F7;
  --border:     #e0e4ec;
  --white:      #ffffff;

  --display:    'Exo 2', sans-serif;
  --body:       'Inter', sans-serif;
  --accent:     'Exo 2', sans-serif;

  --radius:     0px;
  --transition: .22s ease;
}

/* ── Reset ──────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--body);color:var(--charcoal);background:var(--white);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{text-decoration:none;color:inherit;transition:color var(--transition)}
ul,ol{list-style:none}
button{font-family:var(--body);cursor:pointer;border:none;background:none}

/* ── Layout ─────────────────────────────────────────────── */
.wrap{max-width:1240px;margin:0 auto;padding:0 48px}

/* ── Label ──────────────────────────────────────────────── */
.label{
  font-family:var(--accent);
  font-size:11px;font-weight:600;
  letter-spacing:4px;text-transform:uppercase;
  color:var(--gray);
  display:flex;align-items:center;gap:10px;
  margin-bottom:10px;
}
.label::before{content:'━';color:var(--blue);font-size:13px}
.label--light{color:rgba(255,255,255,.4)}
.label--light::before{color:var(--blue)}

/* ── Section title ──────────────────────────────────────── */
.s-title{
  font-family:var(--display);
  font-size:clamp(32px,3.8vw,52px);
  font-weight:800;line-height:.98;
  text-transform:uppercase;letter-spacing:-.5px;
  color:var(--charcoal);
  margin-bottom:14px;
}
.s-title--white{color:#fff}
.s-sub{
  font-size:15px;line-height:1.8;
  color:var(--gray);max-width:560px;
}

/* ── Buttons ────────────────────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--accent);font-size:12px;font-weight:700;
  letter-spacing:2.5px;text-transform:uppercase;
  padding:16px 38px;border:2px solid transparent;
  transition:background var(--transition),color var(--transition),transform var(--transition),border-color var(--transition);
}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--blue);color:#fff}
.btn--primary:hover{background:var(--blue-dark);color:#fff}
.btn--dark{background:var(--dark);color:#fff}
.btn--dark:hover{background:var(--blue);color:#fff}
.btn--outline{border-color:var(--charcoal);color:var(--charcoal)}
.btn--outline:hover{background:var(--charcoal);color:#fff}
.btn--outline-white{border-color:rgba(255,255,255,.55);color:#fff}
.btn--outline-white:hover{background:#fff;color:var(--blue);border-color:#fff}
.btn--white{background:#fff;color:var(--blue)}
.btn--white:hover{transform:translateY(-3px);box-shadow:0 12px 32px rgba(0,0,0,.18);color:var(--blue)}

/* ── Topbar ─────────────────────────────────────────────── */
.topbar{
  background:var(--gray);color:#fff;
  font-size:13px;font-weight:500;
  padding:9px 48px;
  display:flex;gap:32px;align-items:center;
}
.topbar a{color:#fff;display:flex;align-items:center;gap:7px}
.topbar a:hover{color:rgba(255,255,255,.7)}
.topbar svg{width:14px;height:14px;fill:rgba(255,255,255,.7);flex-shrink:0}

/* ── Navbar ─────────────────────────────────────────────── */
.navbar{
  background:#f7f8fa;
  position:sticky;top:0;z-index:200;
  box-shadow:0 2px 18px rgba(0,0,0,.07);
}
.navbar__inner{
  display:flex;align-items:center;
  justify-content:space-between;
  height:78px;padding:0 48px;
}
.logo{display:flex;flex-direction:column;line-height:1}
.logo__mark{
  font-family:var(--display);
  font-size:30px;font-weight:900;
  letter-spacing:3px;color:var(--gray);
  text-transform:uppercase;
}
.logo__mark span{color:var(--blue)}
.logo__tag{
  font-family:var(--accent);
  font-size:9px;font-weight:600;
  letter-spacing:4px;color:var(--gray-lt);
  margin-top:2px;
}
.nav{display:flex;align-items:center;gap:44px}
.nav a{
  font-family:var(--accent);
  font-size:12px;font-weight:600;
  letter-spacing:2.5px;text-transform:uppercase;
  color:var(--charcoal);
  transition:color var(--transition);
}
.nav a:hover,.nav a.active{color:var(--blue)}
.nav .btn--dark{padding:14px 26px;font-size:11px;background:var(--blue)}
.nav .btn--dark:hover{background:var(--blue-dark)}
.hamburger{display:none;flex-direction:column;gap:5px;padding:4px}
.hamburger span{display:block;width:24px;height:2px;background:var(--charcoal);transition:all .3s}

/* ── Hero ───────────────────────────────────────────────── */
.hero{
  position:relative;min-height:92vh;
  display:flex;align-items:center;
  background:var(--dark);overflow:hidden;
}
.hero__bg{
  position:absolute;inset:0;
  background:
    linear-gradient(112deg,rgba(14,18,25,.95) 42%,rgba(14,18,25,.4) 100%),
    url('https://images.unsplash.com/photo-1508444845599-5c89863b1c44?w=1800&q=80')
    center/cover no-repeat;
}
.hero__content{
  position:relative;z-index:2;
  padding:80px 80px;max-width:760px;
}
.hero__eyebrow{
  font-family:var(--accent);
  font-size:13px;font-weight:500;
  letter-spacing:1.5px;
  color:rgba(255,255,255,.6);
  margin-bottom:18px;
  display:flex;align-items:center;gap:10px;
}
.hero__eyebrow::before{content:'—';color:var(--blue)}
.hero h1{
  font-family:var(--display);
  font-size:clamp(56px,7.5vw,98px);
  font-weight:900;line-height:.94;
  text-transform:uppercase;
  letter-spacing:-1px;
  color:#fff;margin-bottom:28px;
}
.hero h1 em{font-style:normal;color:var(--blue)}
.hero__desc{
  font-size:16px;line-height:1.75;
  color:rgba(255,255,255,.65);
  max-width:500px;margin-bottom:48px;
}
.hero__actions{display:flex;gap:14px;flex-wrap:wrap}

/* ── Page hero (inner pages) ───────────────────────────── */
.page-hero{
  background:var(--dark);
  padding:88px 80px 76px;
  position:relative;overflow:hidden;
}
.page-hero::after{
  content:'';position:absolute;
  right:0;top:0;bottom:0;width:35%;
  background:linear-gradient(90deg,var(--dark),rgba(64,111,230,.07));
}
.page-hero h1{
  font-family:var(--display);
  font-size:clamp(44px,5.5vw,72px);
  font-weight:900;line-height:.96;
  text-transform:uppercase;
  letter-spacing:-1px;
  color:#fff;margin-top:10px;
}
.page-hero p{
  font-size:16px;color:rgba(255,255,255,.58);
  margin-top:20px;max-width:540px;line-height:1.7;
}

/* ── About (home) ───────────────────────────────────────── */
.s-about{padding:100px 0;background:var(--white)}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:start}
.about-text p{font-size:15px;line-height:1.85;color:var(--gray);margin-bottom:16px}
.about-cards{display:flex;flex-direction:column;gap:3px;margin-top:48px}
.about-card{padding:28px 32px;display:flex;gap:18px;align-items:flex-start}
.about-card:nth-child(1){background:var(--light)}
.about-card:nth-child(2){background:var(--dark);border-left:3px solid var(--blue)}
.about-card:nth-child(2) h4{color:#fff}
.about-card:nth-child(2) p{color:rgba(255,255,255,.55)}
.about-card__ico{
  width:40px;height:40px;min-width:40px;
  background:var(--blue);
  display:flex;align-items:center;justify-content:center;
  margin-top:2px;
}
.about-card__ico svg{width:20px;height:20px;fill:#fff}
.about-card h4{
  font-family:var(--accent);
  font-size:13px;font-weight:700;
  color:var(--charcoal);margin-bottom:7px;
}
.about-card p{font-size:13px;line-height:1.7;color:var(--gray)}

/* ── How (home) ─────────────────────────────────────────── */
.s-how{padding:100px 0;background:var(--light)}
.how-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;margin-top:52px}
.how-text p{font-size:15px;line-height:1.85;color:var(--gray);margin-bottom:20px}
.how-highlight{
  background:var(--dark);color:#fff;
  padding:40px;border-left:4px solid var(--blue);
}
.how-highlight__label{
  font-family:var(--accent);
  font-size:10px;font-weight:700;
  letter-spacing:3px;text-transform:uppercase;
  color:var(--blue);margin-bottom:14px;
}
.how-highlight__title{
  font-family:var(--display);
  font-size:26px;font-weight:700;line-height:1.25;
  margin-bottom:14px;
}
.how-highlight p{font-size:13px;color:rgba(255,255,255,.45);line-height:1.7}

/* ── Features ───────────────────────────────────────────── */
.s-features{padding:100px 0;background:var(--dark)}
.features-header{text-align:center;margin-bottom:60px}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:3px}
.feat{
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.07);
  padding:44px 36px;
  transition:border-color var(--transition),transform var(--transition);
}
.feat:hover{border-color:var(--blue);transform:translateY(-5px)}
.feat__num{
  font-family:var(--display);
  font-size:52px;font-weight:800;
  color:var(--blue);opacity:.3;
  line-height:1;margin-bottom:18px;
}
.feat h3{
  font-family:var(--display);
  font-size:20px;font-weight:800;
  text-transform:uppercase;color:#fff;
  margin-bottom:12px;letter-spacing:-.3px;
}
.feat p{font-size:14px;line-height:1.75;color:rgba(255,255,255,.5)}

/* ── Steps ──────────────────────────────────────────────── */
.s-steps{padding:100px 0;background:var(--white)}
.steps-header{text-align:center;margin-bottom:56px}
.steps-grid{display:grid;grid-template-columns:1fr 1fr;gap:3px}
.step{
  display:flex;gap:26px;
  padding:44px 40px;
  background:var(--light);
  transition:background var(--transition);
}
.step:hover{background:#e8ecf4}
.step--accent{background:var(--blue)!important}
.step--accent:hover{background:var(--blue-dark)!important}
.step__num{
  font-family:var(--display);
  font-size:58px;font-weight:800;
  color:var(--blue);opacity:.3;
  line-height:1;min-width:54px;
}
.step--accent .step__num{color:#fff;opacity:.25}
.step__body h4{
  font-family:var(--accent);
  font-size:16px;font-weight:700;
  color:var(--charcoal);margin-bottom:10px;
}
.step--accent .step__body h4{color:#fff}
.step__body p{font-size:13px;line-height:1.75;color:var(--gray)}
.step--accent .step__body p{color:rgba(255,255,255,.7)}

/* ── Use cases ──────────────────────────────────────────── */
.s-usecases{padding:100px 0;background:var(--dark)}
.usecases-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:44px;margin-top:52px}
.usecase{border-top:3px solid var(--blue);padding-top:28px}
.usecase h3{
  font-family:var(--display);
  font-size:19px;font-weight:800;
  text-transform:uppercase;color:#fff;
  margin-bottom:14px;line-height:1.15;letter-spacing:-.2px;
}
.usecase p{font-size:14px;line-height:1.75;color:rgba(255,255,255,.5)}

/* ── FAQ ────────────────────────────────────────────────── */
.s-faq{padding:100px 0;background:var(--white)}
.faq-layout{display:grid;grid-template-columns:1fr 2fr;gap:80px;align-items:start}
.faq-intro p{font-size:15px;line-height:1.8;color:var(--gray);margin-top:18px}
.faq-list{border-top:1px solid var(--border)}
.faq-item{border-bottom:1px solid var(--border)}
.faq-q{
  width:100%;background:none;border:none;
  text-align:left;padding:22px 0;
  display:flex;justify-content:space-between;align-items:center;gap:20px;
  font-family:var(--body);font-size:15px;font-weight:600;
  color:var(--charcoal);cursor:pointer;
  transition:color var(--transition);
}
.faq-q:hover{color:var(--blue)}
.faq-ico{
  width:22px;height:22px;min-width:22px;
  border:2px solid currentColor;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:16px;line-height:1;
  transition:transform .3s,color var(--transition);
}
.faq-item.open .faq-q{color:var(--blue)}
.faq-item.open .faq-ico{transform:rotate(45deg)}
.faq-a{
  max-height:0;overflow:hidden;
  transition:max-height .35s ease,padding .3s ease;
  font-size:14px;line-height:1.8;color:var(--gray);
}
.faq-item.open .faq-a{max-height:400px;padding-bottom:22px}

/* ── CTA ────────────────────────────────────────────────── */
.s-cta{
  padding:96px 0;
  background:var(--blue);text-align:center;
}
.s-cta h2{
  font-family:var(--display);
  font-size:clamp(36px,4.2vw,58px);
  font-weight:900;text-transform:uppercase;
  letter-spacing:-1px;
  color:#fff;margin-bottom:14px;
}
.s-cta p{font-size:16px;color:rgba(255,255,255,.8);margin-bottom:44px}
.cta-btns{display:flex;justify-content:center;gap:14px;flex-wrap:wrap}

/* ── Specs grid (about page) ─────────────────────────────── */
.specs{display:flex;flex-direction:column;gap:2px}
.spec{
  display:flex;justify-content:space-between;align-items:center;
  padding:18px 22px;background:var(--light);
  border-left:3px solid transparent;
  transition:border-color var(--transition);
}
.spec:hover{border-color:var(--blue)}
.spec__label{
  font-family:var(--accent);font-size:12px;font-weight:600;
  letter-spacing:.5px;color:var(--gray);
}
.spec__value{
  font-family:var(--display);font-size:22px;font-weight:700;
  color:var(--charcoal);
}

/* ── Contacts page ──────────────────────────────────────── */
.s-contacts{padding:100px 0}
.contacts-grid{display:grid;grid-template-columns:1fr 1.6fr;gap:80px;align-items:start;margin-top:16px}
.c-info{display:flex;flex-direction:column;gap:28px}
.c-item{display:flex;gap:18px;align-items:flex-start}
.c-item__ico{
  width:48px;height:48px;min-width:48px;
  background:var(--light);
  display:flex;align-items:center;justify-content:center;
}
.c-item__ico svg{width:22px;height:22px;fill:var(--blue)}
.c-item h4{
  font-family:var(--accent);font-size:10px;font-weight:700;
  letter-spacing:2.5px;text-transform:uppercase;
  color:var(--gray-lt);margin-bottom:5px;
}
.c-item p,.c-item a{font-size:16px;font-weight:600;color:var(--charcoal)}
.c-item a:hover{color:var(--blue)}
.c-form-wrap{background:var(--light);padding:48px}
.c-form-wrap h3{
  font-family:var(--display);font-size:32px;font-weight:800;
  text-transform:uppercase;letter-spacing:.5px;
  color:var(--charcoal);margin-bottom:6px;
}
.c-form-wrap .form-desc{font-size:14px;color:var(--gray);margin-bottom:28px;line-height:1.6}

/* ── Form ───────────────────────────────────────────────── */
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{margin-bottom:18px}
.field label{
  display:block;
  font-family:var(--accent);font-size:10px;font-weight:700;
  letter-spacing:2px;text-transform:uppercase;
  color:var(--charcoal);margin-bottom:8px;
}
.field label span{color:var(--blue)}
.field input,.field textarea,.field select{
  width:100%;background:#fff;
  border:1.5px solid var(--border);
  padding:13px 16px;
  font-family:var(--body);font-size:14px;color:var(--charcoal);
  outline:none;-webkit-appearance:none;
  transition:border-color var(--transition),box-shadow var(--transition);
}
.field input:focus,.field textarea:focus{
  border-color:var(--blue);
  box-shadow:0 0 0 3px rgba(64,111,230,.1);
}
.field textarea{height:120px;resize:vertical}
.form-msg{
  display:none;padding:14px 18px;
  margin-top:14px;font-size:14px;font-weight:600;
}
.form-msg.ok{background:#d4edda;color:#155724;display:block}
.form-msg.err{background:#f8d7da;color:#721c24;display:block}

/* ── Footer ─────────────────────────────────────────────── */
.footer{background:var(--dark);color:rgba(255,255,255,.6);padding:72px 0 0}
.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 2fr;
  gap:48px;padding-bottom:48px;
}
.footer-brand .logo__mark{font-size:28px;color:rgba(255,255,255,.8)}
.footer-brand .logo__tag{color:rgba(255,255,255,.3)}
.footer-brand p{font-size:13px;line-height:1.7;margin-top:18px;color:rgba(255,255,255,.4)}
.footer-col h4{
  font-family:var(--accent);font-size:10px;font-weight:700;
  letter-spacing:3.5px;text-transform:uppercase;
  color:rgba(255,255,255,.9);margin-bottom:18px;
}
.footer-col li{margin-bottom:10px}
.footer-col a{font-size:13px;color:rgba(255,255,255,.45);transition:color var(--transition)}
.footer-col a:hover{color:var(--blue)}
.footer-sub p{font-size:13px;color:rgba(255,255,255,.4);line-height:1.6;margin-bottom:16px}
.sub-row{display:flex}
.sub-row input{
  flex:1;background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.1);
  color:#fff;padding:12px 16px;
  font-family:var(--body);font-size:13px;outline:none;
  transition:border-color var(--transition);
}
.sub-row input::placeholder{color:rgba(255,255,255,.28)}
.sub-row input:focus{border-color:var(--blue)}
.sub-row button{
  background:var(--blue);color:#fff;
  border:none;padding:0 22px;
  font-family:var(--accent);font-size:10px;font-weight:700;
  letter-spacing:2px;text-transform:uppercase;
  cursor:pointer;transition:background var(--transition);
}
.sub-row button:hover{background:var(--blue-dark)}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.07);
  padding:22px 0;
  display:flex;justify-content:space-between;align-items:center;
  font-size:12px;color:rgba(255,255,255,.22);
}

/* ── Modal ──────────────────────────────────────────────── */
.modal{
  display:none;position:fixed;inset:0;
  background:rgba(0,0,0,.72);
  z-index:1000;align-items:center;justify-content:center;
  backdrop-filter:blur(4px);
}
.modal.open{display:flex}
.modal__box{
  background:#fff;padding:56px;
  max-width:540px;width:90%;
  position:relative;
  animation:mIn .22s ease;
}
@keyframes mIn{from{opacity:0;transform:scale(.96) translateY(8px)}to{opacity:1;transform:none}}
.modal__close{
  position:absolute;top:18px;right:22px;
  font-size:26px;color:var(--gray-lt);
  transition:color var(--transition);
}
.modal__close:hover{color:var(--charcoal)}
.modal__box h3{
  font-family:var(--display);font-size:38px;font-weight:800;
  text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px;
}
.modal__box .modal-desc{font-size:14px;color:var(--gray);margin-bottom:28px;line-height:1.6}

/* ── Reveal animation ───────────────────────────────────── */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .55s ease,transform .55s ease}
.reveal.in{opacity:1;transform:none}

/* ── Responsive ─────────────────────────────────────────── */
@media(max-width:1100px){
  .about-grid,.how-grid,.features-grid,
  .usecases-grid,.footer-grid,
  .contacts-grid,.faq-layout{grid-template-columns:1fr;gap:40px}
  .steps-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .wrap{padding:0 20px}
  .topbar{padding:8px 20px;font-size:12px;flex-wrap:wrap;gap:10px}
  .navbar__inner{padding:0 20px}
  .nav{
    display:none;flex-direction:column;align-items:flex-start;
    position:fixed;top:78px;left:0;right:0;
    background:#f7f8fa;padding:28px 20px;gap:20px;
    box-shadow:0 8px 24px rgba(0,0,0,.1);
  }
  .nav.open{display:flex}
  .hamburger{display:flex}
  .hero__content{padding:48px 24px}
  .hero h1{font-size:64px}
  .page-hero{padding:60px 24px 48px}
  .s-about,.s-how,.s-features,.s-steps,
  .s-usecases,.s-faq,.s-cta,.s-contacts{padding:60px 0}
  .form-row{grid-template-columns:1fr}
  .footer-grid{gap:28px;padding-bottom:28px}
  .footer-bottom{flex-direction:column;gap:8px;text-align:center}
  .modal__box{padding:40px 24px}
  .c-form-wrap{padding:32px 24px}
}