:root {
  --primary: #18cb65;
  --primary-dark: #14b057;
  --primary-light: #2ae078;
  --accent: #ff6b35;
  --white: #ffffff;
  --black: #1a1a2e;
  --background: #ffffff;
  --text: #2d3748;
  --gradient-start: #18cb65;
  --gradient-end: #0fa54c;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  background-color: var(--background);
  color: var(--text);
  line-height: 1.6;
  overflow: hidden;
}

/* Navigation Bar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-end)
  );
  padding: 15px 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.navbar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 3000px;
  padding: 0 20px;
}

.navbar-brand {
  font-size: 1.8rem;
  text-decoration: none;
  color: var(--white);
  font-weight: 700;
  letter-spacing: 1px;
}

/* Back Button */
.back-button {
  position: fixed;
  top: 80px;
  left: 20px;
  background-color: var(--white);
  color: var(--primary);
  padding: 10px 20px;
  border-radius: 50px;
  text-decoration: none;
  font-size: 1.2rem;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  font-weight: 600;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.back-button:hover {
  background-color: var(--primary);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
}

/* Hero Section */
.hero {
  min-height: calc(100vh - 20px);
  background: linear-gradient(
    135deg,
    var(--gradient-start),
    var(--gradient-end)
  );
  color: var(--white);
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding-top: 20px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000" opacity="0.05"><polygon fill="white" points="0,1000 1000,0 1000,1000"/></svg>');
  background-size: cover;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 0 20px;
}

.hero-content h1 {
  font-size: 3.5rem;
  margin-bottom: 10px;
  color: var(--white);
  font-weight: 800;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-content p {
  font-size: 1.5rem;
  margin-bottom: 30px;
  font-weight: 300;
  opacity: 0.9;
}

.app-icon {
  width: 192px;
  height: 192px;
  border-radius: 30px;
  margin-bottom: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  border: 5px solid rgba(255, 255, 255, 0.2);
  transition: transform 0.3s ease;
}

.app-icon:hover {
  transform: scale(1.05);
}

/* Features */
.features {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin: 25px 0 35px;
  flex-wrap: wrap;
}

.features div {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
  font-weight: 500;
  opacity: 0.95;
}

.features i {
  font-size: 1.4rem;
  opacity: 0.9;
}

/* Play Store Button */
.download-button {
  background-color: var(--white);
  color: var(--primary);
  padding: 15px 35px;
  border-radius: 50px;
  text-decoration: none;
  font-size: 1.3rem;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  transition: all 0.3s ease;
  font-weight: 600;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
  position: relative;
  overflow: hidden;
}

.download-button::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
  transition: left 0.5s;
}

.download-button:hover {
  background-color: var(--primary-dark);
  color: var(--white);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.download-button:hover::before {
  left: 100%;
}

.download-button i {
  font-size: 1.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero-content h1 {
    font-size: 2.5rem;
  }

  .hero-content p {
    font-size: 1.2rem;
  }

  .app-icon {
    width: 150px;
    height: 150px;
  }

  .download-button {
    font-size: 1.1rem;
    padding: 12px 25px;
  }

  .back-button {
    top: 70px;
    left: 15px;
    padding: 8px 15px;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: 12px 15px;
  }

  .navbar-brand {
    font-size: 1.5rem;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .hero-content p {
    font-size: 1rem;
  }

  .app-icon {
    width: 120px;
    height: 120px;
  }

  .download-button {
    font-size: 1rem;
    padding: 10px 20px;
  }

  .back-button {
    top: 60px;
    left: 10px;
    padding: 6px 12px;
    font-size: 0.9rem;
  }
}

/* For screens above 2560px */
@media only screen and (min-width: 2560px) {
  .navbar {
    padding: 20px 30px;
  }

  .navbar-brand {
    font-size: 2.5rem;
  }

  .back-button {
    top: 100px;
    left: 30px;
    padding: 15px 30px;
    font-size: 1.5rem;
  }

  .hero-content h1 {
    font-size: 5rem;
  }

  .hero-content p {
    font-size: 2rem;
  }

  .app-icon {
    width: 250px;
    height: 250px;
  }

  .download-button {
    font-size: 1.8rem;
    padding: 20px 40px;
  }
}