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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: #2d3748;
  background: #ffffff;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  padding: 20px 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  z-index: 1000;
  transition: all 0.3s ease;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 26px;
  font-weight: 800;
  text-decoration: none;
  color: #1a202c;
}

.logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

nav {
  display: flex;
  gap: 40px;
  align-items: center;
}

nav a {
  color: #4a5568;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
  font-size: 15px;
  position: relative;
}

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

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

nav a.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background: #667eea;
}

.nav-cta {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white !important;
  padding: 12px 28px;
  border-radius: 25px;
  font-weight: 600;
  transition: transform 0.3s, box-shadow 0.3s;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

/* Hero Section */
.hero {
  margin-top: 80px;
  padding: 100px 0 120px;
  background: linear-gradient(180deg, #f7fafc 0%, #ffffff 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text h1 {
  font-size: 56px;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 24px;
  color: #1a202c;
}

.hero-text .highlight {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text p {
  font-size: 20px;
  color: #4a5568;
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 18px 40px;
  text-decoration: none;
  border-radius: 30px;
  font-weight: 600;
  font-size: 16px;
  transition: all 0.3s;
  box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: white;
  color: #667eea;
  padding: 18px 40px;
  text-decoration: none;
  border-radius: 30px;
  font-weight: 600;
  font-size: 16px;
  border: 2px solid #e2e8f0;
  transition: all 0.3s;
}

.btn-secondary:hover {
  border-color: #667eea;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
}

.stat-item {
  text-align: left;
}

.stat-number {
  font-size: 36px;
  font-weight: 800;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 14px;
  color: #718096;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

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

.phone-mockup {
  position: relative;
  width: 320px;
  height: 650px;
  background: #1a202c;
  border-radius: 50px;
  padding: 15px;
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.25);
  transform: perspective(1000px) rotateY(-5deg);
  transition: transform 0.5s;
}

.phone-mockup:hover {
  transform: perspective(1000px) rotateY(0deg) scale(1.02);
}

.phone-screen {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 40px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.phone-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  animation: imageFade 32s infinite;
}

.phone-screen img:nth-child(1) {
  animation-delay: 0s;
}

.phone-screen img:nth-child(2) {
  animation-delay: 8s;
}

.phone-screen img:nth-child(3) {
  animation-delay: 16s;
}

.phone-screen img:nth-child(4) {
  animation-delay: 24s;
}

@keyframes imageFade {
  0% { opacity: 0; }
  3.67% { opacity: 1; }
  29.67% { opacity: 1; }
  33.33% { opacity: 0; }
  100% { opacity: 0; }
}

.screenshot-placeholder {
  color: white;
  font-size: 18px;
  font-weight: 600;
  text-align: center;
  padding: 20px;
}

.floating-badge {
  position: absolute;
  background: white;
  padding: 16px 24px;
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  font-weight: 600;
  animation: float 3s ease-in-out infinite;
}

.badge-1 {
  top: 10%;
  left: -10%;
  font-size: 14px;
  color: #667eea;
}

.badge-2 {
  bottom: 15%;
  right: -15%;
  font-size: 14px;
  color: #764ba2;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}

/* Features Section */
.features {
  padding: 120px 0;
  background: white;
}

.section-header {
  text-align: center;
  margin-bottom: 80px;
}

.section-label {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #667eea;
  font-weight: 700;
  margin-bottom: 16px;
}

.section-title {
  font-size: 48px;
  font-weight: 900;
  color: #1a202c;
  margin-bottom: 20px;
}

.section-subtitle {
  font-size: 20px;
  color: #718096;
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 40px;
}

.feature-card {
  padding: 40px;
  background: #f7fafc;
  border-radius: 24px;
  transition: all 0.3s;
  border: 2px solid transparent;
}

.feature-card:hover {
  transform: translateY(-8px);
  background: white;
  border-color: #e2e8f0;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  margin-bottom: 24px;
}

.feature-card h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #1a202c;
}

.feature-card p {
  color: #4a5568;
  line-height: 1.8;
  font-size: 16px;
}

/* Showcase Section */
.showcase {
  padding: 120px 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

.showcase::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="white" opacity="0.1"/></svg>');
  opacity: 0.3;
}

.showcase-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.showcase-text h2 {
  font-size: 42px;
  font-weight: 900;
  margin-bottom: 24px;
  line-height: 1.2;
}

.showcase-text p {
  font-size: 18px;
  margin-bottom: 20px;
  opacity: 0.95;
  line-height: 1.8;
}

.showcase-features {
  list-style: none;
  margin-top: 32px;
}

.showcase-features li {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  font-size: 18px;
}

.showcase-features li::before {
  content: '✓';
  width: 32px;
  height: 32px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 700;
}

.showcase-image {
  text-align: center;
}

.showcase-phone {
  width: 280px;
  height: 570px;
  background: #1a202c;
  border-radius: 45px;
  padding: 12px;
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.4);
  display: inline-block;
}

.showcase-phone-screen {
  width: 100%;
  height: 100%;
  background: white;
  border-radius: 35px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.showcase-phone-screen img {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  animation: imageFade 20s infinite;
}

.showcase-phone-screen img:nth-child(1) {
  animation-delay: 0s;
}

.showcase-phone-screen img:nth-child(2) {
  animation-delay: 5s;
}

.showcase-phone-screen img:nth-child(3) {
  animation-delay: 10s;
}

.showcase-phone-screen img:nth-child(4) {
  animation-delay: 15s;
}

/* Social Proof */
.social-proof {
  padding: 80px 0;
  background: #f7fafc;
  text-align: center;
}

.social-proof h3 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #718096;
  font-weight: 700;
  margin-bottom: 40px;
}

.stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 60px;
  max-width: 900px;
  margin: 0 auto;
}

.stat-box {
  text-align: center;
}

.stat-box .number {
  font-size: 48px;
  font-weight: 900;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.stat-box .label {
  font-size: 16px;
  color: #4a5568;
  font-weight: 500;
}

/* CTA Section */
.cta-section {
  padding: 120px 0;
  background: white;
  text-align: center;
}

.cta-box {
  max-width: 800px;
  margin: 0 auto;
  padding: 80px 60px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 32px;
  box-shadow: 0 30px 60px rgba(102, 126, 234, 0.3);
}

.cta-box h2 {
  font-size: 42px;
  font-weight: 900;
  color: white;
  margin-bottom: 20px;
}

.cta-box p {
  font-size: 20px;
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: 36px;
}

.btn-white {
  background: white;
  color: #667eea;
  padding: 18px 48px;
  text-decoration: none;
  border-radius: 30px;
  font-weight: 700;
  font-size: 18px;
  display: inline-block;
  transition: all 0.3s;
}

.btn-white:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

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

.about-hero h1 {
  font-size: 56px;
  font-weight: 900;
  margin-bottom: 20px;
}

.about-hero p {
  font-size: 22px;
  opacity: 0.95;
}

.about-content {
  padding: 100px 0;
}

.about-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  margin-bottom: 100px;
}

.about-section:last-child {
  margin-bottom: 0;
}

.about-image {
  text-align: center;
}

.about-image img {
  width: 100%;
  max-width: 400px;
  border-radius: 24px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1);
}

.about-image-placeholder {
  width: 400px;
  height: 400px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 24px;
  font-weight: 600;
  box-shadow: 0 20px 50px rgba(102, 126, 234, 0.3);
}

.about-text h2 {
  font-size: 42px;
  font-weight: 900;
  color: #1a202c;
  margin-bottom: 24px;
}

.about-text p {
  font-size: 18px;
  color: #4a5568;
  line-height: 1.8;
  margin-bottom: 20px;
}

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

.youtube-hero h1 {
  font-size: 56px;
  font-weight: 900;
  margin-bottom: 20px;
}

.youtube-hero p {
  font-size: 22px;
  opacity: 0.95;
  margin-bottom: 36px;
}

.youtube-content {
  padding: 100px 0;
}

.topic-section {
  margin-bottom: 80px;
}

.topic-header {
  margin-bottom: 40px;
}

.topic-header h2 {
  font-size: 36px;
  font-weight: 900;
  color: #1a202c;
  margin-bottom: 12px;
}

.topic-header p {
  font-size: 18px;
  color: #718096;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.video-card {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: all 0.3s;
  text-decoration: none;
  color: inherit;
  display: block;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.video-thumbnail {
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  position: relative;
  overflow: hidden;
}

.video-thumbnail img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 50px;
  height: 50px;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #667eea;
  transition: transform 0.3s;
}

.video-card:hover .play-button {
  transform: scale(1.1);
}

.video-info {
  padding: 14px;
}

.video-info h3 {
  font-size: 15px;
  font-weight: 600;
  color: #1a202c;
  margin-bottom: 6px;
  line-height: 1.3;
}

.video-info p {
  font-size: 13px;
  color: #718096;
  line-height: 1.5;
}

.video-meta {
  display: flex;
  gap: 16px;
  margin-top: 8px;
  font-size: 13px;
  color: #a0aec0;
}

/* Footer */
footer {
  background: #1a202c;
  color: #a0aec0;
  padding: 60px 0 30px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 40px;
}

.footer-brand {
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-logo img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.footer-brand h3 {
  font-size: 24px;
  font-weight: 800;
  color: white;
}

.footer-brand p {
  line-height: 1.8;
  font-size: 15px;
}

.footer-links h4 {
  color: white;
  font-weight: 700;
  margin-bottom: 20px;
  font-size: 16px;
}

.footer-links ul {
  list-style: none;
}

.footer-links a {
  color: #a0aec0;
  text-decoration: none;
  display: block;
  margin-bottom: 12px;
  transition: color 0.3s;
  font-size: 15px;
}

.footer-links a:hover {
  color: #667eea;
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid #2d3748;
  text-align: center;
  font-size: 14px;
}

/* Responsive */
@media (max-width: 968px) {
  .container {
    padding: 0 24px;
  }
  
  .header-content {
    padding: 0 24px;
    flex-direction: column;
    gap: 20px;
  }
  
  nav {
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    gap: 60px;
    text-align: center;
  }
  
  .hero-text h1 {
    font-size: 42px;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .hero-image {
    order: -1;
  }
  
  .floating-badge {
    display: none;
  }
  
  .showcase-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .about-section {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .section-title {
    font-size: 36px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .video-grid {
    grid-template-columns: 1fr;
  }
}