:root{
  --bg-1: linear-gradient(135deg,#0f172a 0%, #071024 50%, #00121a 100%);
  --glass-bg: rgba(255,255,255,0.06);
  --glass-border: rgba(255,255,255,0.12);
  --accent: #7dd3fc;
  --muted: rgba(255,255,255,0.85);
  --glass-blur: 12px;
  --radius: 14px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial, sans-serif;
  background:var(--bg-1);
  color:#fff;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

.bg{position:fixed;inset:0;background:radial-gradient(circle at 10% 20%, rgba(125,211,252,0.06), transparent 10%), radial-gradient(circle at 90% 80%, rgba(139,92,246,0.06), transparent 10%);pointer-events:none}

.site-header{display:flex;justify-content:space-between;align-items:center;padding:24px;max-width:1100px;margin:0 auto}
.brand{display:flex;align-items:center;gap:12px}
.brand h1{font-size:18px;margin:0}
.logo{width:48px;height:48px}
.nav a{color:var(--muted);text-decoration:none;margin-left:18px}
.nav a.cta{background:linear-gradient(90deg,var(--accent),#8b5cf6);padding:8px 14px;border-radius:999px;color:#001;backdrop-filter:blur(4px);}

.nav-toggle{display:none;background:transparent;border:0;padding:8px;border-radius:8px;cursor:pointer;color:var(--muted)}
.nav-toggle svg{display:block}

/* Mobile nav (hidden by default, toggled via .nav-open on body) */
.nav.mobile-hidden{display:none}
.nav.mobile-panel{position:fixed;inset:60px 18px auto 18px;background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:12px;padding:12px;display:flex;flex-direction:column;gap:10px;z-index:60}
.nav.mobile-panel a{margin-left:0}

.hero{min-height:100vh;padding:48px 20px 80px;display:flex;flex-direction:column}
.hero-content{display:flex;gap:28px;align-items:center;max-width:1100px;margin:28px auto;padding:28px;border-radius:18px;}

.glass{background:var(--glass-bg);border:1px solid var(--glass-border);backdrop-filter:blur(var(--glass-blur));box-shadow:0 6px 30px rgba(2,6,23,0.6);}

.hero-left{flex:1}
.hero-right{flex:0 0 360px;display:flex;justify-content:center}
.hero h2{font-size:34px;margin:0 0 12px}
.lead{color:var(--muted);font-size:16px;margin-bottom:18px}

.actions{display:flex;gap:12px;margin-bottom:18px}
.button{display:inline-block;padding:12px 18px;border-radius:12px;text-decoration:none;font-weight:600}
.button.primary{background:linear-gradient(90deg,var(--accent),#8b5cf6);color:#012}
.button.ghost{border:1px solid rgba(255,255,255,0.08);color:var(--muted);background:transparent}

.highlights{display:flex;gap:14px;list-style:none;padding:0;margin:0;color:var(--muted)}
.highlights li{background:rgba(255,255,255,0.02);padding:8px 12px;border-radius:999px;font-size:13px}

.phone-mockup{width:260px;height:520px;border-radius:15px;overflow:hidden;border:1px solid rgba(255,255,255,0.06);box-shadow:0 10px 40px rgba(2,6,23,0.6);}
.phone-mockup img{width:100%;height:100%;object-fit:cover;display:block}

/* Carousel inside phone mockup */
.phone-mockup{position:relative}
.carousel{width:100%;height:100%;position:relative;overflow:visible;perspective:1200px;transform-style:preserve-3d}
.slide{position:absolute;left:0;top:0;width:100%;height:100%;transition:transform .6s cubic-bezier(.2,.9,.2,1),filter .45s ease,box-shadow .45s ease;display:flex;align-items:stretch}
.slide img{width:100%;height:100%;object-fit:cover;display:block;border-radius:inherit}

/* stacked book layout */
.slide--center{transform:translateX(0) translateZ(0) scale(1) rotateY(0);z-index:3;box-shadow:0 20px 50px rgba(2,6,23,0.6)}
.slide--right{transform:translateX(12%) translateZ(-80px) scale(.92) rotateY(-10deg);z-index:2;filter:brightness(.92)}
.slide--left{transform:translateX(-12%) translateZ(-80px) scale(.92) rotateY(10deg);z-index:2;filter:brightness(.92)}
.slide--behind{transform:translateY(6%) translateZ(-160px) scale(.86) rotateY(0);z-index:1;filter:brightness(.8);opacity:0.95}

.carousel-control{position:absolute;top:50%;transform:translateY(-50%);background:rgba(0,0,0,0.35);border:0;color:#fff;width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer}
.carousel-control.prev{left:8px}
.carousel-control.next{right:8px}

.carousel-indicators{position:absolute;left:50%;transform:translateX(-50%);bottom:12px;display:flex;gap:8px}
.carousel-indicators .indicator{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,0.2);border:0;cursor:pointer}
.carousel-indicators .indicator.active{background:linear-gradient(90deg,var(--accent),#8b5cf6)}

.section{max-width:1100px;margin:36px auto;padding:20px}
.features .cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;align-items:start}
.card{flex:1;padding:20px;border-radius:14px;transition:transform .22s ease,box-shadow .22s ease;border:1px solid rgba(255,255,255,0.04)}
.card:hover{transform:translateY(-8px);box-shadow:0 18px 40px rgba(2,6,23,0.6)}
.card h4{margin:0 0 8px;display:flex;align-items:center;gap:10px;font-size:16px}
.card p{color:var(--muted);margin:0;font-size:14px}

/* Icons inside cards */
.card svg{width:36px;height:36px;flex:0 0 36px;border-radius:8px;padding:6px;background:linear-gradient(180deg,rgba(255,255,255,0.04),rgba(255,255,255,0.02));}
.feature-icon{width:36px;height:36px;flex:0 0 36px;border-radius:8px;padding:6px;background:linear-gradient(180deg,rgba(255,255,255,0.04),rgba(255,255,255,0.02));}
.screenshots .gallery{display:flex;gap:12px}
.screenshots img{width:calc(33% - 8px);border-radius:12px;border:1px solid rgba(255,255,255,0.04)}

.site-footer{max-width:1100px;margin:40px auto;padding:18px;display:flex;justify-content:space-between;align-items:center;border-radius:12px}
.site-footer small{display:block;color:var(--muted)}

@media (max-width:1100px){
  .features .cards{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:700px){
  .hero-content{flex-direction:column-reverse;padding:18px}
  .hero-right{flex:0 0 auto}
  .screenshots .gallery{flex-direction:column}
  .screenshots img{width:100%}
  .features .cards{grid-template-columns:1fr}
}

/* Additional responsive breakpoints for smoother scaling */
@media (max-width:1100px){
  .site-header{padding:18px}
  .brand h1{font-size:16px}
  .logo{width:40px;height:40px}
  .hero{padding:36px 18px 60px}
  .hero-content{margin:18px auto;padding:20px;border-radius:16px}
  .hero h2{font-size:30px}
  .hero-right{flex:0 0 320px}
  .phone-mockup{width:220px;height:440px}
}

@media (max-width:900px){
  /* Keep site header as a single row so brand and nav-toggle align horizontally */
  .site-header{flex-direction:row;align-items:center;gap:12px}
  .brand{flex:1;display:flex;align-items:center;gap:12px}
  .nav{display:flex;justify-content:flex-end;align-items:center}
  .nav a{margin-left:12px}
  .hero-content{gap:18px}
  .hero-right{order:0}
  .hero-left{order:1}
  .hero h2{font-size:26px}
  .lead{font-size:15px}
  .features .cards{grid-template-columns:repeat(2,1fr);gap:14px}
  .phone-mockup{width:200px;height:400px}

  /* mobile nav behavior */
  .nav{display:none}
  .nav.mobile-hidden{display:none}
  .nav-toggle{display:inline-flex;margin-left:auto}
  body.nav-open .nav{display:flex}
  body.nav-open .nav{animation:fadeIn .14s ease}
}

@media (max-width:700px){
  /* refine previously defined rules for extra small screens */
  .site-header{padding:14px}
  .brand{width:100%;justify-content:space-between}
  .nav{justify-content:flex-end}
  .nav a{margin-left:10px;font-size:14px}
  .hero{padding:24px 14px 48px}
  .hero-content{padding:16px;border-radius:12px}
  .hero h2{font-size:22px}
  .lead{font-size:14px}
  .actions{flex-direction:column;align-items:stretch}
  .actions .button{width:100%;text-align:center}
  .hero-right{display:flex;justify-content:center;margin-bottom:8px}
  .phone-mockup{width:280px;height:560px;border-radius:28px}
  .features .cards{grid-template-columns:1fr}
}

@media (max-width:480px){
  .site-header{padding:12px}
  .brand h1{font-size:14px}
  .logo{width:36px;height:36px}
  .hero h2{font-size:20px}
  .lead{font-size:13px}
  .phone-mockup{width:220px;height:440px}
  .card h4{font-size:15px}
  .card p{font-size:13px}
  .highlights li{font-size:12px;padding:6px 10px}
  .site-footer{flex-direction:column;gap:8px;padding:12px}
}