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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: #333;
}

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

/* Header */
.header {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  padding: 15px 0;
  box-shadow: 0 4px 30px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(255,255,255,0.3);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 24px;
  font-weight: 800;
  background: linear-gradient(135deg, #667eea, #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 30px;
  align-items: center;
}

.nav a {
  text-decoration: none;
  color: #555;
  font-weight: 500;
  transition: color 0.3s;
  font-size: 15px;
}

.nav a:hover {
  color: #667eea;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 5px;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: #667eea;
  border-radius: 3px;
  transition: all 0.3s;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 80px 20px 60px;
  color: white;
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 20px;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero p {
  font-size: 20px;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.6;
}

.download-btn {
  display: inline-block;
  padding: 18px 45px;
  background: white;
  color: #667eea;
  border-radius: 50px;
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  transition: all 0.3s;
}

.download-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(0,0,0,0.3);
}

/* Section */
.section {
  background: rgba(255,255,255,0.95);
  border-radius: 20px;
  padding: 50px;
  margin: 40px 0;
  box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 40px;
  text-align: center;
  color: #333;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  margin: 15px auto 0;
  border-radius: 2px;
}

/* Download Cards */
.download-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.download-card {
  background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
  border-radius: 20px;
  padding: 40px;
  text-align: center;
  transition: all 0.3s;
}

.download-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 50px rgba(0,0,0,0.15);
}

.download-card h3 {
  font-size: 24px;
  margin-bottom: 15px;
  color: #333;
}

.download-card .version {
  color: #667eea;
  font-weight: 600;
  margin-bottom: 10px;
}

.download-card .size {
  color: #888;
  margin-bottom: 20px;
}

.download-card .qr {
  width: 150px;
  height: 150px;
  margin: 20px auto;
  background: #eee;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: #888;
}

.platform-btn {
  display: inline-block;
  padding: 12px 35px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s;
  margin-top: 15px;
}

.platform-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 10px 25px rgba(102,126,234,0.4);
}

.feature-list {
  list-style: none;
  text-align: left;
  margin: 20px 0;
}

.feature-list li {
  padding: 8px 0;
  padding-left: 25px;
  position: relative;
  color: #555;
}

.feature-list li::before {
  content: '✓';
  color: #667eea;
  position: absolute;
  left: 0;
  font-weight: bold;
}

/* Reviews */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
}

.review-card {
  background: linear-gradient(135deg, #667eea15, #764ba215);
  border-radius: 15px;
  padding: 25px;
  border: 1px solid rgba(102,126,234,0.1);
}

.review-card .user {
  font-weight: 600;
  margin-bottom: 10px;
  color: #333;
}

.review-card .rating {
  color: #f1c40f;
  margin-bottom: 10px;
  font-size: 18px;
}

.review-card .comment {
  color: #666;
  line-height: 1.6;
}

.review-card .date {
  color: #aaa;
  font-size: 13px;
  margin-top: 10px;
}

/* FAQ */
.faq-item {
  border-bottom: 1px solid #eee;
  padding: 20px 0;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-question {
  font-weight: 600;
  color: #333;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 17px;
}

.faq-question::after {
  content: '+';
  font-size: 22px;
  color: #667eea;
  transition: transform 0.3s;
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  color: #666;
  line-height: 1.8;
  margin-top: 10px;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* Updates */
.update-item {
  background: #f8f9fa;
  border-radius: 12px;
  padding: 25px;
  margin-bottom: 20px;
  border-left: 4px solid #667eea;
}

.update-item .version {
  font-weight: 700;
  color: #667eea;
  font-size: 18px;
}

.update-item .date {
  color: #888;
  font-size: 14px;
  margin: 5px 0 15px;
}

.update-item ul {
  list-style: none;
}

.update-item ul li {
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  color: #555;
}

.update-item ul li::before {
  content: '•';
  color: #667eea;
  position: absolute;
  left: 0;
  font-weight: bold;
}

/* Tutorial Steps */
.tutorial-item {
  margin-bottom: 30px;
}

.tutorial-item h4 {
  margin-bottom: 15px;
  color: #333;
  font-size: 18px;
}

.tutorial-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
}

.step {
  background: #f8f9fa;
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  border: 1px solid #eee;
}

.step .num {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  width: 35px;
  height: 35px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 10px;
  font-weight: 700;
}

/* Safety Warning */
.safety-warning {
  background: linear-gradient(135deg, #ff6b6b, #ee5a24);
  color: white;
  border-radius: 15px;
  padding: 30px;
  text-align: center;
  margin: 40px 0;
}

.safety-warning h3 {
  font-size: 24px;
  margin-bottom: 15px;
}

.safety-warning p {
  opacity: 0.9;
  line-height: 1.6;
  max-width: 600px;
  margin: 0 auto;
}

/* Footer */
.footer {
  background: rgba(255,255,255,0.95);
  text-align: center;
  padding: 30px;
  margin-top: 40px;
  border-radius: 20px 20px 0 0;
}

.footer p {
  color: #666;
  margin: 5px 0;
}

.footer a {
  color: #667eea;
  text-decoration: none;
}

/* Responsive */
@media (max-width: 768px) {
  .nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  }
  
  .nav.active {
    display: flex;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hero h1 {
    font-size: 32px;
  }
  
  .hero p {
    font-size: 16px;
  }
  
  .download-grid {
    grid-template-columns: 1fr;
  }
  
  .section {
    padding: 30px 20px;
  }
  
  .review-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 26px;
  }
  
  .section-title {
    font-size: 24px;
  }
  
  .download-card {
    padding: 25px;
  }
}