:root {
  --primary-color: #4CAF50;
  --secondary-color: #2E7D32;
  --accent-color: #81C784;
  --text-color: #333;
  --light-bg: #f9f9f9;
  --dark-bg: #333;
  --white: #fff;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--light-bg);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--white);
  border: 2px solid var(--primary-color);
}

.btn-primary:hover {
  background-color: var(--secondary-color);
  border-color: var(--secondary-color);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: var(--white);
  padding: 100px 0;
  position: relative;
  overflow: hidden;
}

.hero-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.hero-text {
  flex: 1;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero .subtitle {
  font-size: 1.5rem;
  margin-bottom: 30px;
  opacity: 0.9;
}

.hero-features {
  margin-bottom: 30px;
}

.hero-features p {
  margin-bottom: 10px;
  font-size: 1.1rem;
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image img {
  max-width: 100%;
  height: auto;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  transform: perspective(800px) rotateY(-15deg);
  transition: transform 0.5s ease;
}

.hero-image img:hover {
  transform: perspective(800px) rotateY(0deg);
}

/* Sections */
.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 20px;
  color: var(--secondary-color);
  padding-top: 80px;
}

.section-subtitle {
  font-size: 1.2rem;
  text-align: center;
  margin-bottom: 50px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* Features Section */
.features {
  background-color: var(--white);
  padding-bottom: 80px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.feature-card {
  background-color: var(--white);
  border-radius: 15px;
  padding: 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.feature-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 20px;
  color: var(--primary-color);
}

.feature-card h3 {
  margin-bottom: 15px;
  font-size: 1.5rem;
}

/* Screenshots Section */
.screenshots {
  background-color: var(--light-bg);
  padding-bottom: 80px;
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.screenshot-item {
  text-align: center;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.screenshot-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.screenshot-item img {
  width: 100%;
  height: auto;
  border-radius: 15px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.screenshot-item img:hover {
  transform: scale(1.05);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.screenshot-item p {
  margin-top: 15px;
  font-size: 1rem;
}

/* Use Cases Section */
.use-cases {
  background-color: var(--white);
  padding-bottom: 80px;
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
  margin-top: 50px;
}

.use-case-item {
  text-align: center;
  padding: 20px;
  border-radius: 10px;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.use-case-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.use-case-item:hover {
  background-color: var(--light-bg);
  transform: translateY(-5px);
}

.use-case-icon {
  font-size: 2.5rem;
  margin-bottom: 15px;
}

/* How to Use Section */
.how-to-use {
  background-color: var(--light-bg);
  padding-bottom: 80px;
}

.steps {
  max-width: 800px;
  margin: 50px auto 0;
}

.step {
  display: flex;
  margin-bottom: 40px;
  position: relative;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.step.visible {
  opacity: 1;
  transform: translateY(0);
}

.step:last-child {
  margin-bottom: 0;
}

.step:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 50px;
  left: 25px;
  width: 2px;
  height: calc(100% - 10px);
  background-color: var(--accent-color);
}

.step-number {
  width: 50px;
  height: 50px;
  background-color: var(--primary-color);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: bold;
  margin-right: 20px;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.step-content {
  flex: 1;
}

.step-content h3 {
  margin-bottom: 10px;
  font-size: 1.3rem;
}

/* Tips Section */
.tips {
  background-color: var(--white);
  padding-bottom: 80px;
}

.tips-content {
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--light-bg);
  padding: 30px;
  border-radius: 15px;
  box-shadow: var(--shadow);
}

.tips-content ul {
  list-style-position: inside;
  margin-left: 20px;
}

.tips-content li {
  margin-bottom: 15px;
  font-size: 1.1rem;
}

/* Download CTA Section */
.download-cta {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: var(--white);
  text-align: center;
  padding: 80px 0;
}

.cta-content {
  max-width: 800px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

.cta-content p {
  font-size: 1.2rem;
  margin-bottom: 30px;
  opacity: 0.9;
}

.cta-content .btn {
  margin-top: 20px;
}

/* Footer */
.footer {
  background-color: var(--dark-bg);
  color: var(--white);
  padding: 40px 0;
  text-align: center;
}

.footer p {
  margin-bottom: 10px;
}

.footer a {
  color: var(--accent-color);
  text-decoration: none;
  transition: var(--transition);
}

.footer a:hover {
  color: var(--white);
}

/* Animation */
.section-title, .section-subtitle {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.section-title.visible, .section-subtitle.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 992px) {
  .hero h1 {
    font-size: 2.8rem;
  }
  
  .hero .subtitle {
    font-size: 1.3rem;
  }
  
  .section-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 768px) {
  .hero-content {
    flex-direction: column-reverse;
    text-align: center;
  }
  
  .hero-image {
    margin-bottom: 40px;
  }
  
  .hero-image img {
    transform: none;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .feature-grid,
  .screenshot-grid,
  .use-cases-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

@media (max-width: 576px) {
  .hero {
    padding: 80px 0;
  }
  
  .hero h1 {
    font-size: 2.2rem;
  }
  
  .hero .subtitle {
    font-size: 1.1rem;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .feature-grid,
  .screenshot-grid {
    grid-template-columns: 1fr;
  }
  
  .use-cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}