:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --accent-color: #e74c3c;
  --text-color: #333;
  --light-bg: #f8f9fa;
}

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

body {
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
}

.navbar {
  background-color: var(--primary-color);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
  color: white !important;
  font-weight: 600;
}

.nav-link {
  color: rgba(255, 255, 255, 0.9) !important;
}

.hero {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 6rem 0;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  opacity: 0.9;
}

.section {
  padding: 5rem 0;
}

.section:nth-child(even) {
  background-color: var(--light-bg);
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
  color: var(--primary-color);
}

.card {
  border: none;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
  margin-bottom: 2rem;
}

.card:hover {
  transform: translateY(-5px);
}

.metric-card {
  text-align: center;
  padding: 2rem;
}

.metric-value {
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--secondary-color);
}

.metric-label {
  font-size: 1.1rem;
  color: var(--text-color);
  opacity: 0.8;
}

.chart-container {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  margin-bottom: 2rem;
}

.feature-icon {
  font-size: 1.2rem;
  color: var(--secondary-color);
  margin-right: 1rem;
}

.feature-details h5 {
  color: var(--primary-color);
  margin: 1.5rem 0 1rem;
}

.process-card {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  height: 100%;
  margin-bottom: 1rem;
}

.process-card h5 {
  color: var(--secondary-color);
  margin-bottom: 1rem;
}

.process-card ul {
  list-style: none;
  padding-left: 0;
}

.process-card li {
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
}

.process-card li:before {
  content: "•";
  color: var(--secondary-color);
  position: absolute;
  left: 0;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1rem;
}

.metric-item {
  text-align: center;
  padding: 1rem;
  background: var(--light-bg);
  border-radius: 8px;
}

.model-details {
  background: var(--light-bg);
  padding: 1rem;
  border-radius: 8px;
  margin-top: 1rem;
}

.model-details h6 {
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.model-details ul {
  margin-bottom: 0;
}

.technique-card {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  height: 100%;
  margin-bottom: 1rem;
}

.technique-card h5 {
  color: var(--secondary-color);
  margin-bottom: 1rem;
}

.technique-card p {
  color: var(--text-color);
  margin-bottom: 1rem;
}

.technique-card ul {
  list-style: none;
  padding-left: 0;
}

.technique-card li {
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
}

.technique-card li:before {
  content: "→";
  color: var(--secondary-color);
  position: absolute;
  left: 0;
}

.lead {
  font-size: 1.25rem;
  font-weight: 300;
  line-height: 1.5;
}

.conclusion {
  background: var(--primary-color);
  color: white;
  padding: 4rem 0;
}

/* Timeline styling */
.timeline {
  position: relative;
  padding: 2rem 0;
}

.timeline-item {
  padding: 2rem;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  margin-bottom: 2rem;
  transition: transform 0.3s ease;
}

.timeline-item:hover {
  transform: translateY(-5px);
}

.timeline-content h4 {
  color: var(--secondary-color);
  margin-bottom: 1rem;
}

/* Impact section styling */
.impact-box {
  background: rgba(255,255,255,0.1);
  padding: 2rem;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.2);
}

.impact-box h4 {
  color: white;
  margin-bottom: 1rem;
}

.impact-box p {
  color: rgba(255,255,255,0.9);
  font-size: 1.1rem;
}

.findings-list li {
  background: rgba(255,255,255,0.1);
  padding: 1.5rem;
  border-radius: 8px;
  margin-bottom: 1rem !important;
  transition: transform 0.3s ease;
}

.findings-list li:hover {
  transform: translateX(10px);
}

.findings-list i {
  color: #2ecc71;
}

.findings-list strong {
  color: #fff;
  margin-right: 0.5rem;
}

/* Technical challenges section */
.bg-light {
  background-color: var(--light-bg) !important;
}

.card {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}

.card-title {
  color: var(--secondary-color);
  font-weight: 600;
}

.card-title i {
  color: var(--primary-color);
}

.conclusion h2 {
  margin-bottom: 2rem;
}

.btn-primary {
  background-color: var(--secondary-color);
  border: none;
  padding: 0.8rem 2rem;
}

.btn-primary:hover {
  background-color: #2980b9;
}

@media (max-width: 768px) {
  .hero {
    padding: 4rem 0;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .section {
    padding: 3rem 0;
  }
}