:root{
  --ink:#1d2433; --slate:#4A5980; --blue:#7098FF; --mist:#DEE6FA; --paper:#fff; --tint:#F3F6FD;
  --radius:14px; --max:1100px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);line-height:1.6}
img,video{max-width:100%;display:block}
a{color:inherit}
h1,h2,h3,h4{line-height:1.2;font-weight:700}
.container{max-width:var(--max);margin:0 auto;padding:0 24px}
.container--narrow{max-width:680px}
.center{text-align:center;margin-top:40px}
.muted{color:var(--slate);font-size:.92rem}

/* Nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--mist)}
.nav__inner{max-width:var(--max);margin:0 auto;padding:12px 24px;display:flex;align-items:center;justify-content:space-between}
.nav__logo img{height:40px;width:auto}
.nav__links{display:flex;gap:28px}
.nav__links a{text-decoration:none;font-weight:500;color:var(--slate)}
.nav__links a:hover{color:var(--ink)}
.nav__toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav__toggle span{display:block;width:22px;height:2px;background:var(--ink);margin:5px 0}

/* Buttons */
.btn{display:inline-block;padding:14px 30px;border-radius:999px;font-weight:600;text-decoration:none;border:0;cursor:pointer;font-size:1rem}
.btn--primary{background:var(--slate);color:#fff}
.btn--primary:hover{background:var(--ink)}
.btn--light{background:#fff;color:var(--ink)}
.link-cta{display:inline-block;margin-top:18px;font-weight:600;color:var(--slate);text-decoration:none;border-bottom:2px solid var(--blue)}
:focus-visible{outline:3px solid var(--blue);outline-offset:3px}

/* Hero */
.hero{padding:88px 0 64px;text-align:center}
.hero h1{font-size:clamp(2rem,5vw,3.4rem);max-width:780px;margin:0 auto 20px;letter-spacing:-.02em}
.lead{max-width:640px;margin:0 auto 32px;color:var(--slate);font-size:1.08rem}
.hero__video{margin:56px auto 0;border-radius:var(--radius);width:100%;max-width:900px}

/* Sections */
.section{padding:96px 0}
.section--tint{background:var(--tint)}
.section--dark{background:var(--slate);color:#fff}
.section__head{text-align:center;max-width:680px;margin:0 auto 56px}
.section__head h2{font-size:clamp(1.7rem,3.5vw,2.4rem);margin-bottom:14px}
.section__head p{color:var(--slate)}
.tagline{text-align:center;color:var(--blue);font-weight:600;margin-bottom:10px}
.tagline--light{color:var(--mist)}
.sub-title{text-align:center;font-size:1.6rem;margin:80px 0 32px}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.solution img{border-radius:var(--radius);aspect-ratio:4/3;object-fit:cover;width:100%;margin-bottom:18px}
.solution h3{font-size:1.25rem;margin-bottom:8px}
.solution p{margin-bottom:8px}

/* NFC demo */
.nfc-demo{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:center;margin-bottom:64px}
.nfc-demo video{border-radius:var(--radius);width:100%}
.nfc-demo__title{font-size:3rem;color:var(--slate);margin-bottom:8px}

.features{display:grid;grid-template-columns:repeat(5,1fr);gap:20px}
.feature{background:#fff;border-radius:var(--radius);padding:22px}
.feature h4{margin-bottom:6px}
.feature p{font-size:.92rem;color:var(--slate)}

.gallery{list-style:none;display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.gallery img{border-radius:10px;aspect-ratio:1;object-fit:cover;width:100%}
.gallery span{display:block;text-align:center;margin-top:8px;font-weight:600}

.plan{background:#fff;border-radius:var(--radius);padding:30px;border:1px solid var(--mist)}
.plan--featured{border:2px solid var(--blue)}
.plan h3{font-size:1.4rem;margin-bottom:6px}
.plan>p{color:var(--slate);margin-bottom:16px}
.plan ul{padding-left:18px}
.plan li{margin-bottom:6px;font-size:.95rem}

/* Rows */
.row{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;margin-bottom:80px}
.row:last-child{margin-bottom:0}
.row--reverse .row__text{order:2}
.row__img{border-radius:var(--radius);width:100%;aspect-ratio:4/3;object-fit:cover}
.row__text h3{font-size:1.6rem;margin-bottom:12px}
.row__text p{color:var(--slate)}
.checks{list-style:none;margin-top:16px}
.checks li{padding-left:26px;position:relative;margin-bottom:6px}
.checks li::before{content:"✓";position:absolute;left:0;color:var(--blue);font-weight:700}

/* Steps */
.steps{list-style:none;counter-reset:s;display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.steps li{counter-increment:s;padding-top:56px;position:relative;font-weight:500}
.steps li::before{content:counter(s);position:absolute;top:0;left:0;width:40px;height:40px;border-radius:50%;background:var(--slate);color:#fff;display:grid;place-items:center;font-weight:700}

/* Contact */
.section--dark h2{font-size:2.2rem;margin-bottom:14px;text-align:center}
.section--dark p{color:var(--mist);text-align:center}
.form{display:grid;gap:12px;margin:36px 0}
.form input,.form textarea{font:inherit;padding:14px 16px;border-radius:10px;border:0;width:100%}
.form button{justify-self:center}
.socials{list-style:none;display:flex;justify-content:center;flex-wrap:wrap;gap:22px}
.socials a{color:#fff;font-weight:500}
.footer{text-align:center;padding:28px;font-size:.85rem;color:var(--slate)}

/* Mobile */
@media (max-width:900px){
  .grid-3,.row,.nfc-demo{grid-template-columns:1fr}
  .row--reverse .row__text{order:0}
  .features{grid-template-columns:1fr 1fr}
  .gallery{grid-template-columns:repeat(3,1fr)}
  .steps{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  .nav__toggle{display:block}
  .nav__links{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:0;background:#fff;border-bottom:1px solid var(--mist)}
  .nav__links.open{display:flex}
  .nav__links a{padding:14px 24px}
  .section{padding:64px 0}
  .gallery{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}