* {
   margin: 0;
   padding: 0;
   box-sizing: border-box;
   font-family: system-ui;
}

body {
   background: #f4f6fb;
   color: #222;
   line-height: 1.6;
   font-size: 0.7rem;
   font-family: 'Inter', sans-serif;
}

/* HEADER */

.header {
   display: flex;
   justify-content: space-between;
   align-items: center;
   padding: 16px;
   background: white;
   border-bottom: 1px solid #eee;
}

nav a {
   margin-left: 12px;
   text-decoration: none;
   color: #444;
   font-size: 14px;
}

/* HERO */

.hero {
   padding: 70px 20px;
   text-align: center;
   background: linear-gradient(135deg, #5b6cff, #8b7cff);
   color: white;
}

.hero h1 {
   font-size: 28px;
   margin-bottom: 10px;
}

.hero p {
   font-size: 16px;
   opacity: 0.9;
}

/* BUTTON */

.main-btn {
   margin-top: 20px;
   padding: 12px 22px;
   border: none;
   background: white;
   color: #5b6cff;
   border-radius: 8px;
   font-weight: 600;
   cursor: pointer;
}

/* FEATURES */

.features {
   padding: 60px 20px;
   text-align: center;
}

.features-grid {
   display: grid;
   gap: 15px;
   margin-top: 30px;
}

.feature {
   background: white;
   padding: 20px;
   border-radius: 12px;
   box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

/* SCREENSHOTS */

.screens {
   padding: 60px 20px;
   text-align: center;
}

.screens-grid {
   display: grid;
   gap: 15px;
   margin-top: 30px;
}

.screens-grid img {
   width: 100%;
   height: 260px;
   object-fit: cover;
   border-radius: 14px;
}

/* DEMO */

.demo {
   padding: 70px 20px;
   text-align: center;
   background: #111;
   color: white;
}

/* FOOTER */

footer {
   text-align: center;
   padding: 25px;
   background: #000;
   color: white;
   font-size: 14px;
}

/* DESKTOP */

@media(min-width:768px) {

   .hero h1 {
      font-size: 40px;
   }

   body {
      font-size: 0.9rem;
   }

   .features-grid {
      grid-template-columns: repeat(3, 1fr);
   }

   .screens-grid {
      grid-template-columns: repeat(2, 1fr);
   }

   .screens-grid img {
      height: 320px;
   }

}

.back {
   color: #f3ebeb;
   text-decoration: none;
   background: #000000;
   padding: 10px 22px;
   border-radius: 10px;
   font-weight: 500;
   border: 1px solid rgba(255, 255, 255, 0.1);
   transition: .25s;
   cursor: pointer;
}

.back:hover {
   transform: translateY(-2px);
   background: #f5f3f3;
   color: #0e0101;
   cursor: pointer;
}

/* MOBILE ADAPTIVE - max-width: 768px */
@media (max-width: 768px) {
   .hero h1 {
      font-size: 22px;
   }

   .hero p {
      font-size: 14px;
   }

   body {
      font-size: 14px;
   }

   .hero {
      padding: 50px 15px;
   }

   .features,
   .screens,
   .demo {
      padding: 40px 15px;
   }

   .features-grid {
      grid-template-columns: 1fr;
   }

   .screens-grid {
      grid-template-columns: 1fr;
   }

   .screens-grid img {
      height: 180px;
   }

   .feature {
      padding: 15px;
      font-size: 13px;
   }

   .main-btn {
      padding: 10px 18px;
      font-size: 14px;
   }

   .header {
      padding: 10px;
   }

   .logo {
      font-size: 16px;
      white-space: nowrap;
   }

   nav a {
      font-size: 13px;
      margin-left: 5px;
      white-space: nowrap;
   }

   .back {
      font-size: 14px;
      padding: 6px 8px;
      white-space: nowrap;
      position: fixed;
      bottom: 50px;
      right: 20px;
      z-index: 9999;
   }

   footer {
      padding: 18px;
      font-size: 12px;
   }
}