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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #64748b;
  --bg-light: #f8f9fa;
  --text-dark: #1e293b;
  --text-light: #64748b;
  --white: #ffffff;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
}

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

/* Header */
header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

.nav-links a:hover {
  color: var(--primary);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 160px 0 80px;
  text-align: center;
}

.hero h1 {
  font-size: 56px;
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #fff 0%, #e0e7ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
}

.hero-desc {
  font-size: 18px;
  opacity: 0.9;
}

/* Features */
.features {
  padding: 100px 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 32px;
  margin-top: 48px;
}

.feature-card {
  background: white;
  padding: 32px;
  border-radius: 16px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.1);
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.feature-card p {
  color: var(--text-light);
}

/* App Showcase */
.app-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: 48px 0;
}

.app-showcase.reverse {
  direction: rtl;
}

.app-showcase.reverse > * {
  direction: ltr;
}

.app-badge {
  display: inline-block;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}

.app-info h2 {
  font-size: 36px;
  margin-bottom: 16px;
}

.app-info p {
  font-size: 18px;
  color: var(--text-light);
  margin-bottom: 24px;
}

.feature-list {
  list-style: none;
  margin-bottom: 32px;
}

.feature-list li {
  font-size: 16px;
  padding: 8px 0;
  color: var(--text-dark);
}

/* Phone Mockup */
.phone-mockup {
  width: 280px;
  height: 560px;
  background: #1e293b;
  border-radius: 40px;
  padding: 12px;
  margin: 0 auto;
  box-shadow: 0 25px 50px rgba(0,0,0,0.25);
}

.screen {
  background: white;
  border-radius: 32px;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 32px;
}

.screen h3 {
  font-size: 28px;
  color: var(--primary);
  margin-bottom: 8px;
}

.screen p {
  color: var(--text-light);
  margin-bottom: 24px;
}

.score, .progress {
  font-size: 32px;
  font-weight: 700;
  color: #10b981;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s;
  cursor: pointer;
}

.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(37, 99, 235, 0.3);
}

/* CTA */
.cta {
  background: linear-gradient(135deg, #667eea, #764ba2);
  padding: 80px 0;
  text-align: center;
  color: white;
}

.cta h2 {
  font-size: 36px;
  margin-bottom: 16px;
}

.cta p {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 32px;
}

.cta .btn {
  background: white;
  color: var(--primary);
}

.cta .btn:hover {
  background: #f8f9fa;
  transform: translateY(-2px);
}

/* Footer */
footer {
  background: #1e293b;
  color: white;
  padding: 48px 0;
  text-align: center;
}

.footer-bottom p {
  opacity: 0.7;
  margin: 8px 0;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 36px;
  }
  
  .app-showcase {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  
  .app-showcase.reverse {
    direction: ltr;
  }
  
  .nav-links {
    display: none;
  }
  
  .phone-mockup {
    width: 220px;
    height: 440px;
  }
}