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

:root {
  --primary-color: #2563eb;
  --secondary-color: #1e40af;
  --accent-color: #0891b2;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --dark: #1f2937;
  --light: #f3f4f6;
  --border: #e5e7eb;
  --text: #374151;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.15);
}

html {
  scroll-behavior: smooth;
}

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

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

/* Navigation */
.navbar {
  background: var(--dark);
  color: white;
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo h1 {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent-color);
}

.logo .tagline {
  font-size: 12px;
  color: #d1d5db;
  margin-top: 2px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 30px;
}

.nav-link {
  color: #d1d5db;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent-color);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 120px 0;
  text-align: center;
}

.hero-content h2 {
  font-size: 48px;
  margin-bottom: 20px;
  font-weight: 700;
}

.hero-content p {
  font-size: 20px;
  margin-bottom: 40px;
  opacity: 0.95;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s;
  border: 2px solid transparent;
  cursor: pointer;
  font-size: 14px;
}

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

.btn-primary:hover {
  background: var(--secondary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-secondary {
  background: transparent;
  color: white;
  border-color: white;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border-color: var(--primary-color);
}

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

.btn-text {
  background: transparent;
  color: var(--primary-color);
  padding: 8px 20px;
}

.btn-text:hover {
  color: var(--secondary-color);
}

.btn-large {
  padding: 16px 50px;
  font-size: 16px;
}

/* Features Section */
.features {
  padding: 100px 0;
  background: var(--light);
}

.features h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 60px;
  color: var(--dark);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.feature-card {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: all 0.3s;
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: 15px;
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
  color: var(--dark);
}

.feature-card p {
  color: var(--text);
  line-height: 1.6;
}

/* Interactions Section */
.interactions {
  padding: 100px 0;
  background: var(--light);
}

.interactions-hero {
  text-align: center;
  margin-bottom: 60px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.interactions-hero h2 {
  font-size: 42px;
  color: var(--dark);
  margin-bottom: 20px;
  font-weight: 700;
}

.hero-intro {
  font-size: 20px;
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 15px;
  line-height: 1.6;
}

.hero-desc {
  font-size: 18px;
  color: var(--text);
  line-height: 1.8;
}

.interactions-benefits {
  background: white;
  padding: 50px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  margin-bottom: 60px;
}

.interactions-benefits h3 {
  font-size: 24px;
  color: var(--dark);
  margin-bottom: 25px;
  font-weight: 600;
}

.benefits-list {
  list-style: none;
  padding: 0;
  margin-bottom: 25px;
}

.benefits-list li {
  padding: 12px 0;
  padding-left: 30px;
  position: relative;
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
}

.benefits-list li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success-color);
  font-weight: bold;
  font-size: 20px;
}

.benefits-note {
  background: rgba(37, 99, 235, 0.05);
  padding: 20px;
  border-left: 4px solid var(--primary-color);
  border-radius: 6px;
  color: var(--text);
  line-height: 1.8;
}

.section-subtitle {
  text-align: center;
  font-size: 18px;
  color: var(--text);
  margin-bottom: 60px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.interactions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
  margin-bottom: 60px;
}

.interaction-card {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: all 0.3s;
  border-left: 4px solid var(--accent-color);
}

.interaction-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-left-color: var(--primary-color);
}

.interaction-icon {
  font-size: 42px;
  margin-bottom: 15px;
}

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

.interaction-card > p {
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.6;
}

.interaction-features {
  list-style: none;
  margin-bottom: 20px;
  padding: 15px;
  background: rgba(37, 99, 235, 0.05);
  border-radius: 8px;
}

.interaction-features li {
  padding: 8px 0;
  padding-left: 20px;
  position: relative;
  color: var(--text);
  font-size: 14px;
}

.interaction-features li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success-color);
  font-weight: bold;
}

.interaction-example {
  background: #f0f9ff;
  border-left: 3px solid var(--primary-color);
  padding: 15px;
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
}

.interaction-example strong {
  color: var(--primary-color);
}

.interaction-philosophy {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}

.philosophy-item {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.philosophy-item h4 {
  font-size: 20px;
  color: var(--dark);
  margin-bottom: 20px;
  font-weight: 600;
}

.philosophy-list {
  list-style: none;
  padding: 0;
}

.philosophy-list li {
  padding: 10px 0;
  padding-left: 25px;
  position: relative;
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
}

.philosophy-list li:before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: bold;
  font-size: 16px;
}

.philosophy-tagline {
  font-size: 18px;
  color: var(--primary-color);
  font-weight: 600;
  line-height: 1.8;
  margin-bottom: 15px;
}

.philosophy-item p {
  color: var(--text);
  line-height: 1.8;
  font-size: 15px;
}

.interaction-cta {
  text-align: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 60px;
  border-radius: 12px;
  border: none;
}

.interaction-cta h3 {
  font-size: 32px;
  color: white;
  margin-bottom: 15px;
  font-weight: 700;
}

.interaction-cta p {
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: 30px;
  font-size: 18px;
  line-height: 1.6;
}

/* Apps Section */
.apps {
  padding: 100px 0;
}

.apps h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 60px;
  color: var(--dark);
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
}

.app-card {
  background: white;
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 30px;
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
}

.app-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-lg);
  transform: translateY(-5px);
}

.app-card.coming-soon {
  opacity: 0.8;
  background: linear-gradient(135deg, rgba(240, 253, 250, 0.5), rgba(224, 242, 254, 0.5));
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 15px;
  gap: 15px;
}

.app-header h3 {
  font-size: 20px;
  color: var(--dark);
  flex: 1;
}

.badge {
  background: var(--accent-color);
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.app-card p {
  margin-bottom: 20px;
  color: var(--text);
  line-height: 1.6;
  flex: 1;
}

.app-features {
  margin-bottom: 20px;
  background: var(--light);
  padding: 15px;
  border-radius: 8px;
}

.app-features ul {
  list-style: none;
  padding: 0;
}

.app-features li {
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  color: var(--text);
}

.app-features li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success-color);
  font-weight: bold;
}

.app-stats {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.app-stats span {
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary-color);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
}

.app-card > a {
  margin-top: auto;
}

.app-card .btn {
  width: 100%;
  text-align: center;
  margin-bottom: 10px;
}

/* Tech Stack Section */
.tech-stack {
  padding: 80px 0;
  background: var(--dark);
  color: white;
}

.tech-stack h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 60px;
  color: white;
}

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

.tech-item {
  background: rgba(255, 255, 255, 0.1);
  padding: 30px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.3s;
}

.tech-item:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-3px);
}

.tech-item h4 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--accent-color);
}

.tech-item p {
  color: #d1d5db;
  font-size: 14px;
}

/* About Section */
.about {
  padding: 100px 0;
  background: var(--light);
}

.about h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 60px;
  color: var(--dark);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text p {
  margin-bottom: 20px;
  line-height: 1.8;
  color: var(--text);
}

.about-text ul {
  margin: 20px 0 20px 20px;
  list-style: none;
}

.about-text li {
  padding: 10px 0;
  padding-left: 25px;
  position: relative;
  color: var(--text);
}

.about-text li:before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: bold;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.stat {
  background: white;
  padding: 30px;
  border-radius: 12px;
  text-align: center;
  box-shadow: var(--shadow);
}

.stat h3 {
  font-size: 32px;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.stat p {
  color: var(--text);
  font-weight: 500;
}

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

.cta h2 {
  font-size: 42px;
  margin-bottom: 15px;
}

.cta p {
  font-size: 18px;
  margin-bottom: 30px;
  opacity: 0.95;
}

/* Contact Section */
.contact {
  padding: 100px 0;
}

.contact h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 60px;
  color: var(--dark);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info h3 {
  font-size: 24px;
  margin-bottom: 15px;
  color: var(--dark);
}

.contact-info p {
  color: var(--text);
  margin-bottom: 30px;
  line-height: 1.8;
}

.contact-details {
  margin: 30px 0;
}

.detail {
  margin-bottom: 25px;
}

.detail h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.detail p {
  color: var(--text);
}

.detail a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.detail a:hover {
  text-decoration: underline;
}

/* Form */
.contact-form {
  background: var(--light);
  padding: 30px;
  border-radius: 12px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--dark);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 14px;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.contact-form .btn {
  width: 100%;
}

/* Footer */
.footer {
  background: var(--dark);
  color: #d1d5db;
  padding: 60px 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h4 {
  color: white;
  margin-bottom: 15px;
  font-size: 16px;
}

.footer-section p {
  line-height: 1.6;
  font-size: 14px;
}

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

.footer-section li {
  margin-bottom: 8px;
}

.footer-section a {
  color: #d1d5db;
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  text-align: center;
  font-size: 13px;
}

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

.footer-bottom a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-menu {
    gap: 15px;
    font-size: 14px;
  }

  .hero-content h2 {
    font-size: 32px;
  }

  .hero-content p {
    font-size: 16px;
  }

  .interactions-hero h2 {
    font-size: 32px;
  }

  .features h2,
  .apps h2,
  .interactions h2,
  .about h2,
  .contact h2 {
    font-size: 28px;
  }

  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .about-stats {
    grid-template-columns: 1fr 1fr;
  }

  .cta h2 {
    font-size: 28px;
  }

  .features-grid,
  .apps-grid,
  .interactions-grid,
  .tech-grid {
    grid-template-columns: 1fr;
  }

  .interaction-philosophy {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .interactions-benefits {
    padding: 30px 20px;
  }

  .interaction-cta {
    padding: 40px 20px;
  }

  .interaction-cta h3 {
    font-size: 24px;
  }
}

@media (max-width: 480px) {
  .navbar .container {
    flex-direction: column;
    gap: 15px;
  }

  .nav-menu {
    flex-direction: column;
    gap: 10px;
    width: 100%;
  }

  .hero {
    padding: 60px 0;
  }

  .hero-content h2 {
    font-size: 24px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-buttons .btn {
    width: 100%;
  }

  .about-stats {
    grid-template-columns: 1fr;
  }

  .app-header {
    flex-direction: column;
  }

  .badge {
    align-self: flex-start;
  }
}