:root{
  --bg:#071017;
  --card:#071b1b;
  --accent:#04a39a;
  --muted: #9fb7b6;
  --glass: rgba(255,255,255,0.05);
  --container: 1100px;
  --radius: 14px;
  --glass-2: rgba(255,255,255,0.03);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  background:linear-gradient(180deg,var(--bg) 0%, #02121a 100%);
  color: #e9f7f6;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

/* container */
.container{
  width: min(96%, var(--container));
  margin: 0 auto;
}

/* header */
.site-header{
  position:fixed;
  width:100%;
  z-index:80;
  top:0;
  left:0;
  backdrop-filter: blur(6px);
  background: linear-gradient(180deg, rgba(7,16,23,0.55), rgba(7,16,23,0.2));
  border-bottom:1px solid rgba(255,255,255,0.03);
}
.nav{display:flex;align-items:center;gap:12px;padding:12px 0}
.logo{display:flex;align-items:center;gap:10px;color:var(--accent);text-decoration:none;font-weight:700}
.logo span{font-size:18px}
.menu-btn{display:none;background:none;border:0;color:var(--muted);font-size:20px}
.nav-links{list-style:none;display:flex;gap:18px;margin:0;padding:0;align-items:center}
.nav-links a{color:var(--muted);text-decoration:none;font-weight:600}
.cta{margin-left:auto;background:linear-gradient(90deg,var(--accent),#66e3db);padding:8px 14px;border-radius:10px;color:#002422;text-decoration:none;font-weight:700}

/* hero */
.hero{
  padding-top:96px;
  min-height:92vh;
  position:relative;
  overflow:hidden;
  display:flex;
  align-items:center;
}
.bg-canvas{position:absolute;inset:0;z-index:0}
.hero-inner{display:flex;gap:40px;align-items:center;position:relative;padding:60px 0;z-index:2}
.hero-content{flex:1;max-width:640px}
.title{font-size:40px;margin:0 0 6px;line-height:1}
.accent{color:var(--accent)}
.subtitle{color:var(--muted);margin:0 0 16px;font-size:18px}
.tagline{font-style:italic;margin-bottom:18px;color:#cceeea}
.hero-actions{display:flex;gap:12px;margin-bottom:18px}
.btn{display:inline-block;padding:10px 16px;border-radius:12px;border:0;cursor:pointer;text-decoration:none;font-weight:700}
.btn-primary{background:linear-gradient(90deg,var(--accent),#66e3db);color:#002422}
.btn-ghost{background:transparent;border:1px solid rgba(255,255,255,0.06);color:var(--muted)}
.btn.disabled, .btn[aria-disabled="true"]{opacity:0.5;pointer-events:none}
.trust{display:flex;gap:10px;align-items:center;color:var(--muted)}
.pulse-dot{width:10px;height:10px;border-radius:50%;background:radial-gradient(circle,var(--accent),#02625d);box-shadow:0 0 12px rgba(4,163,154,0.6);animation:pulse 2s infinite}
@keyframes pulse{0%{transform:scale(0.9);opacity:0.8}50%{transform:scale(1.2);opacity:1}100%{transform:scale(0.9);opacity:0.8}}

/* phone preview */
.hero-preview{width:420px;flex-shrink:0;display:flex;justify-content:center}
.phone{width:240px;border-radius:28px;background:linear-gradient(180deg,#052626,#0e2b2b);padding:14px;box-shadow: 0 20px 40px rgba(2,20,22,0.6);transform:translateY(0);animation:float 6s ease-in-out infinite}
@keyframes float{0%{transform:translateY(0)}50%{transform:translateY(-12px)}100%{transform:translateY(0)}}
.phone-screen{height:420px;width:212px;border-radius:18px;background:linear-gradient(180deg,#f7fffe00,#ffffff08);padding:12px;overflow:hidden;display:flex;flex-direction:column;gap:10px}
.message{max-width:85%;padding:10px 12px;border-radius:12px;font-size:14px;line-height:1.3}
.from-bot{background:linear-gradient(90deg,#0b6f6b,#044c4b);align-self:flex-start;color:#e6fffb}
.from-user{background:linear-gradient(90deg,#163b3a,#0a2626);align-self:flex-end;color:#cfeeee}

/* sections */
.section{padding:72px 0}
.section-title{font-size:26px;margin:0 0 6px}
.section-lead{color:var(--muted);margin-bottom:18px}

/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px}
.card{background:linear-gradient(180deg,var(--glass),var(--glass-2));padding:18px;border-radius:14px;border:1px solid rgba(255,255,255,0.03);backdrop-filter: blur(8px);transition:transform .45s cubic-bezier(.2,.9,.3,1),box-shadow .3s}
.card:hover{transform:translateY(-8px);box-shadow:0 18px 40px rgba(2,20,22,0.6)}
.card-icon{font-size:28px;margin-bottom:10px}

/* how */
.how-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:18px}
.step{background:linear-gradient(180deg,var(--glass),transparent);padding:18px;border-radius:12px;border:1px solid rgba(255,255,255,0.03)}
.step-num{width:44px;height:44px;border-radius:10px;background:linear-gradient(90deg,var(--accent),#66e3db);display:flex;align-items:center;justify-content:center;font-weight:700;margin-bottom:8px;color:#002422}

/* qr */
.qr-row{display:flex;gap:20px;align-items:flex-start}
.qr-card{flex:1;display:flex;gap:16px;background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));padding:18px;border-radius:12px;border:1px solid rgba(255,255,255,0.03)}
.qr-preview{width:220px;display:flex;flex-direction:column;align-items:center;gap:10px}
.qr-preview img{width:180px;height:180px;border-radius:12px;background:#0b1b1b;display:block;padding:8px;object-fit:contain}
.qr-hint{color:var(--muted);font-size:13px;text-align:center}
.qr-actions{flex:1;display:flex;flex-direction:column;gap:8px}
.qr-actions input{background:transparent;border:1px solid rgba(255,255,255,0.04);padding:10px;border-radius:10px;color:inherit}

/* about */
.about-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin-top:16px}
.about-block{padding:14px;background:linear-gradient(180deg, rgba(255,255,255,0.02), transparent);border-radius:10px}

/* footer */
.site-footer{padding:18px 0;background:transparent;border-top:1px solid rgba(255,255,255,0.02);margin-top:20px}
.footer-inner{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:14px}

/* reveal animation */
[data-anim]{opacity:0;transform:translateY(14px);transition:all .7s cubic-bezier(.2,.9,.3,1)}
[data-anim].visible{opacity:1;transform:none}

/* Desktop-only helper:
   By default desktop-only elements are hidden (mobile-first).
   They become visible on screens >= 921px (desktop). */
.desktop-only{display:none}

/* responsive */
@media (max-width:920px){
  .hero-inner{flex-direction:column-reverse;gap:30px;padding:30px 0}
  .hero-preview{width:100%}
  .nav-links{display:none}
  .menu-btn{display:block;margin-left:auto}
  .cta{display:none}
  .qr-row{flex-direction:column}
  .how-grid{grid-template-columns:1fr}
}

/* show desktop-only on larger screens */
@media (min-width:921px){
  .desktop-only{display:flex}
}

/* small */
.small{font-size:13px;color:var(--muted)}