```css
/* styles.css */

/* Base Styles */
body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f0f4f8;
  color: #333;
  line-height: 1.6;
}

/* Header Styles */
.header {
  background: #fff3b2;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.header .logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #e67e22;
}

.search-bar {
  background: none;
  border: none;
  font-size: 1.1rem;
  padding: 0.5rem 1rem;
  border-radius: 5px;
  margin: 0 0.5rem;
  cursor: pointer;
  transition: background 0.3s ease;
}

.search-bar:focus {
  outline: none;
  background: #f0f0f0;
}

.notifications {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: #e67e22;
  padding: 0.3rem 0.5rem;
  border-radius: 3px;
}

/* Banner Styles */
.banner {
  background: #fff9e6;
  padding: 2rem 1rem;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  margin: 1rem 0;
}

.banner h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  color: #e67e22;
}

.banner p {
  font-size: 1.2rem;
  color: #555;
}

/* Metrics Styles */
.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  padding: 2rem 1rem;
  background: #fff;
  border-bottom: 1px solid #eee;
}

.metric {
  background: #f8f9fa;
  padding: 1.5rem;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.metric h2 {
  margin-top: 0;
  color: #e67e22;
  font-size: 1.1rem;
}

.metric p {
  font-size: 1.3rem;
  font-weight: bold;
  color: #2c3e50;
}

/* Dashboard Styles */
.dashboard {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  padding: 2rem 1rem;
}

.widget {
  background: #fff;
  padding: 1.5rem;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  text-align: center;
  transition: transform 0.2s ease;
}

.widget:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.widget h2 {
  margin-top: 0;
  color: #e67e22;
  font-size: 1.1rem;
}

/* CTA Button */
.cta-btn {
  display: block;
  margin: 2rem auto;
  padding: 0.75rem 2rem;
  background: #e67e22;
  color: #fff;
  border: none;
  border-radius: 5px;
  font-size: 1.1rem;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s ease;
}

.cta-btn:hover {
  background: #b74c3c;
}

/* Responsive Styles */
@media (max-width: 768px) {
  .header {
    flex-direction: column;
    align-items: flex-start;
  }

  .search-bar {
    margin: 0.5rem 0;
  }

  .dashboard {
    grid-template-columns: 1fr;
  }

  .metric, .widget {
    padding: 1rem;
  }
}
```