/* NeXell Therapeutics Website Styles */

:root {
  /* Color Variables */
  --primary: #ff6600;
  --primary-dark: #cc5200;
  --primary-light: #ff8533;
  --secondary: #0066cc;
  --secondary-dark: #004d99;
  --secondary-light: #3399ff;
  --neutral-light: #f5f5f5;
  --neutral-medium: #e0e0e0;
  --neutral-dark: #333333;
  --white: #ffffff;
  --black: #000000;
  
  /* Typography */
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Open Sans', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 5rem;
  
  /* Border Radius */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--neutral-dark);
  background-color: var(--white);
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--neutral-dark);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
  position: relative;
  padding-bottom: var(--spacing-sm);
}

h2:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background-color: var(--primary);
}

h3 {
  font-size: 1.5rem;
}

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

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

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

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

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

.section {
  padding: var(--spacing-xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section-title h2 {
  display: inline-block;
}

.section-title h2:after {
  left: 50%;
  transform: translateX(-50%);
}

/* Header Styles */
.header {
  background-color: var(--white);
  box-shadow: var(--shadow-sm);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: all var(--transition-medium);
}

.header-scrolled {
  box-shadow: var(--shadow-md);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 50px;
  margin-right: var(--spacing-sm);
}

.logo-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--primary);
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
}

.nav-item {
  margin-left: var(--spacing-md);
}

.nav-link {
  color: var(--neutral-dark);
  font-weight: 600;
  position: relative;
  padding: var(--spacing-xs) 0;
}

.nav-link:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: width var(--transition-medium);
}

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

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--neutral-dark);
}

/* Hero Section */
.hero {
  height: 70vh;
  min-height: 600px;
  background: linear-gradient(135deg, rgba(255, 102, 0, 0.9), rgba(255, 133, 51, 0.8));
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--white);
  padding-top: 80px; /* Account for fixed header */
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: var(--white);
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
}

/* Card Styles */
.card {
  background-color: var(--white);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform var(--transition-medium), box-shadow var(--transition-medium);
}

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

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-content {
  padding: var(--spacing-md);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

/* Grid Layout */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

/* Features Section */
.features {
  background-color: var(--neutral-light);
}

.feature-item {
  text-align: center;
  padding: var(--spacing-md);
}

.feature-icon {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

/* Team Section */
.team-member {
  text-align: center;
}

.team-img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: var(--spacing-sm);
  border: 4px solid var(--primary);
}

.team-name {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
}

.team-position {
  color: var(--primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.team-bio {
  margin-bottom: var(--spacing-sm);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--primary);
  color: var(--white);
  transition: background-color var(--transition-fast);
}

.social-link:hover {
  background-color: var(--primary-dark);
  color: var(--white);
}

/* Contact Form */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
}

.form-control {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--neutral-medium);
  border-radius: var(--border-radius-sm);
  font-family: var(--font-body);
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
}

textarea.form-control {
  min-height: 150px;
  resize: vertical;
}

/* Footer */
.footer {
  background-color: var(--neutral-dark);
  color: var(--white);
  padding: var(--spacing-lg) 0;
}

.footer-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.footer-logo {
  margin-bottom: var(--spacing-sm);
}

.footer-logo img {
  height: 150px;
}

.footer-title {
  color: var(--white);
  margin-bottom: var(--spacing-md);
  position: relative;
  padding-bottom: var(--spacing-xs);
}

.footer-title:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background-color: var(--primary);
}

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

.footer-link {
  margin-bottom: var(--spacing-xs);
}

.footer-link a {
  color: var(--neutral-medium);
  transition: color var(--transition-fast);
}

.footer-link a:hover {
  color: var(--primary);
}

.contact-info {
  margin-bottom: var(--spacing-xs);
  display: flex;
  align-items: flex-start;
}

.contact-info i {
  margin-right: var(--spacing-sm);
  color: var(--primary);
}

.copyright {
  text-align: center;
  padding-top: var(--spacing-md);
  margin-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--primary);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-medium);
  z-index: 999;
}

.back-to-top.active {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--primary-dark);
}

/* About Page Specific */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline:before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  background-color: var(--primary);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.timeline-content {
  position: relative;
  width: calc(50% - 30px);
  padding: var(--spacing-md);
  background-color: var(--white);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
}

.timeline-item:nth-child(odd) .timeline-content {
  margin-left: auto;
}

.timeline-date {
  position: absolute;
  top: 0;
  width: 100px;
  height: 100px;
  background-color: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  text-align: center;
  padding: 10px;
  font-size: 1.0rem;
}

.timeline-item:nth-child(odd) .timeline-date {
  left: -30px;
}

.timeline-item:nth-child(even) .timeline-date {
  right: -30px;
}

/* Technology Page Specific */
.tech-diagram {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.tech-diagram img {
  max-width: 100%;
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.benefit-item {
  text-align: center;
  padding: var(--spacing-md);
  background-color: var(--white);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-medium), box-shadow var(--transition-medium);
}

.benefit-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.benefit-icon {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

/* Responsive Styles */
@media (max-width: 992px) {
  h1 {
    font-size: 2.25rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .timeline:before {
    left: 30px;
  }
  
  .timeline-content {
    width: calc(100% - 80px);
    margin-left: 80px !important;
  }
  
  .timeline-date {
    left: 0 !important;
    right: auto !important;
  }
}

@media (max-width: 768px) {
  .header-container {
    padding: var(--spacing-sm);
  }
  
  .nav-list {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background-color: var(--white);
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-md);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-medium);
    z-index: 999;
  }
  
  .nav-list.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-item {
    margin: var(--spacing-xs) 0;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .hero {
    min-height: 500px;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  .logo img {
    height: 40px;
  }
  
  .logo-text {
    font-size: 1.25rem;
  }
  
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .timeline-content {
    width: calc(100% - 60px);
    margin-left: 60px !important;
  }
  
  .timeline-date {
    width: 50px;
    height: 50px;
    font-size: 0.875rem;
  }
}