:root {
  --primary-gradient: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
  --secondary-gradient: linear-gradient(135deg, #f39c12 0%, #e67e22 100%);
  --accent-gradient: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
  --joint-gradient: linear-gradient(135deg, #1abc9c 0%, #16a085 100%);
  --dark-bg: #0c1810;
  --card-bg: rgba(255, 255, 255, 0.05);
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-primary: 0 20px 40px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 30px 60px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: "Inter", sans-serif;
  background: var(--dark-bg);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  z-index: 1000;
  /* padding: 1rem 0; */
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background: var(--bg-nav);
  box-shadow: 0 2px 27px rgb(0 0 0 / 20%);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
}

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(
    ellipse at center,
    rgba(46, 204, 113, 0.1) 0%,
    transparent 70%
  );
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="joint-pattern" width="25" height="25" patternUnits="userSpaceOnUse"><circle cx="12.5" cy="12.5" r="3" fill="rgba(46,204,113,0.05)"/><path d="M0 12.5h25M12.5 0v25" stroke="rgba(255,255,255,0.02)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23joint-pattern)"/></svg>');
  opacity: 0.7;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  text-align: center;
  position: relative;
  z-index: 2;
}

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2rem;
  text-align: center;
  backdrop-filter: blur(20px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(46, 204, 113, 0.1),
    transparent
  );
  transition: left 0.5s ease;
}

.stat-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(46, 204, 113, 0.3);
}

.stat-card:hover::before {
  left: 100%;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--joint-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: block;
  margin-bottom: 0.5rem;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

/* Treatment Solutions */
.treatments {
  padding: 100px 0;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(46, 204, 113, 0.05) 100%
  );
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.treatments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.treatment-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2.5rem;
  backdrop-filter: blur(20px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.treatment-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.treatment-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(46, 204, 113, 0.3);
}

.treatment-card:hover::before {
  transform: scaleX(1);
}

.treatment-icon {
  width: 70px;
  height: 70px;
  background: var(--primary-gradient);
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  color: white;
}

.treatment-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.treatment-description {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.treatment-features {
  list-style: none;
  margin-bottom: 2rem;
}

.treatment-features li {
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
}

.treatment-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #2ecc71;
  font-weight: bold;
}

.treatment-status {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: 1rem;
}

.status-development {
  background: rgba(46, 204, 113, 0.2);
  color: #2ecc71;
}

.status-preclinical {
  background: rgba(243, 156, 18, 0.2);
  color: #f39c12;
}

.status-research {
  background: rgba(52, 152, 219, 0.2);
  color: #3498db;
}

/* Joint Health Journey */
.joint-journey {
  padding: 100px 0;
}

.journey-stages {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
  position: relative;
}

.stage-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2.5rem;
  text-align: center;
  backdrop-filter: blur(20px);
  transition: all 0.3s ease;
}

.stage-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(46, 204, 113, 0.3);
}

.stage-icon {
  width: 80px;
  height: 80px;
  background: var(--secondary-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 2rem;
  color: white;
}

.stage-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.stage-description {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.stage-benefits {
  list-style: none;
  text-align: left;
}

.stage-benefits li {
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
  font-size: 0.9rem;
}

.stage-benefits li::before {
  content: "●";
  position: absolute;
  left: 0;
  color: #f39c12;
  font-weight: bold;
}

/* Mechanism of Action */
.mechanism {
  padding: 100px 0;
  background: linear-gradient(
    180deg,
    rgba(46, 204, 113, 0.05) 0%,
    transparent 100%
  );
}

.mechanism-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.mechanism-text h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.mechanism-text p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.mechanism-pathways {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.pathway-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 15px;
  padding: 1.5rem;
  text-align: center;
  backdrop-filter: blur(20px);
  transition: all 0.3s ease;
}

.pathway-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(46, 204, 113, 0.3);
}

.pathway-icon {
  width: 50px;
  height: 50px;
  background: var(--accent-gradient);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  font-size: 1.2rem;
  color: white;
}

.pathway-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.pathway-description {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* Patient Impact */
.patient-impact {
  padding: 100px 0;
}

.impact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.impact-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2.5rem;
  text-align: center;
  backdrop-filter: blur(20px);
  transition: all 0.3s ease;
}

.impact-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(46, 204, 113, 0.3);
}

.impact-metric {
  font-size: 3rem;
  font-weight: 800;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: block;
  margin-bottom: 0.5rem;
}

.impact-label {
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 1rem;
}

.impact-description {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* CTA Section */
.cta {
  padding: 100px 0;
  text-align: center;
}

.cta-content {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  padding: 4rem;
  backdrop-filter: blur(20px);
  max-width: 800px;
  margin: 0 auto;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.cta-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 1rem 2rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
}

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

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

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

.btn-secondary:hover {
  background: var(--card-bg);
  border-color: rgba(46, 204, 113, 0.5);
  transform: translateY(-3px);
}

/* Footer */
.footer {
  background: var(--bg-nav);
  padding: 3rem 0 1rem;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.footer-section h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: var(--primary-gradient);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section ul li a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-section ul li a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.2rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .mechanism-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .mechanism-pathways {
    grid-template-columns: 1fr;
  }

  .journey-stages {
    grid-template-columns: 1fr;
  }

  .cta-content {
    padding: 2rem;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.animate-fade-in {
  animation: fadeInUp 0.8s ease-out;
}

.pulse {
  animation: pulse 2s infinite;
}