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

:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --accent-color: #e74c3c;
  --light-bg: #ecf0f1;
  --text-color: #2c3e50;
  --border-color: #bdc3c7;
  --success-color: #27ae60;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: #f8f9fa;
}

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

/* Header */
header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  padding: 60px 0;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header h1 {
  font-size: 3em;
  margin-bottom: 10px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

header .subtitle {
  font-size: 1.2em;
  opacity: 0.9;
  font-weight: 300;
}

/* Navigation Bar */
.navbar {
  background-color: white;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 40px;
  padding: 15px 0;
}

.navbar a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  transition: color 0.3s ease;
  padding: 8px 15px;
  border-radius: 4px;
}

.navbar a:hover,
.navbar a.active {
  color: var(--secondary-color);
  background-color: rgba(52, 152, 219, 0.1);
}

/* Main Content */
main {
  padding: 60px 0;
}

/* About Section */
.about-section {
  background: white;
  padding: 40px;
  border-radius: 8px;
  margin-bottom: 60px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.about-section h2 {
  color: var(--primary-color);
  font-size: 2.2em;
  margin-bottom: 20px;
  border-bottom: 3px solid var(--secondary-color);
  padding-bottom: 15px;
}

.about-section p {
  font-size: 1.1em;
  color: #555;
  line-height: 1.8;
}

/* Members Section */
.members-section h2 {
  color: var(--primary-color);
  font-size: 2.2em;
  margin-bottom: 40px;
  text-align: center;
  border-bottom: 3px solid var(--secondary-color);
  padding-bottom: 15px;
}

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

/* Member Cards */
.member-card {
  background: white;
  border-radius: 12px;
  padding: 30px;
  text-align: center;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
  border: 1px solid #e0e0e0;
}

.member-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 25px rgba(52, 152, 219, 0.15);
  border-color: var(--secondary-color);
}

.member-avatar {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2.5em;
  font-weight: bold;
  margin: 0 auto 20px;
  box-shadow: 0 4px 10px rgba(52, 152, 219, 0.3);
}

.member-card h3 {
  font-size: 1.5em;
  margin-bottom: 8px;
  color: var(--primary-color);
}

.member-card .role {
  color: var(--secondary-color);
  font-weight: 600;
  font-size: 0.95em;
  margin-bottom: 15px;
}

.member-card .description {
  color: #666;
  margin-bottom: 25px;
  font-size: 0.95em;
  line-height: 1.6;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  font-size: 1em;
}

.btn-primary {
  background-color: var(--secondary-color);
  color: white;
  box-shadow: 0 4px 10px rgba(52, 152, 219, 0.3);
}

.btn-primary:hover {
  background-color: #2980b9;
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(52, 152, 219, 0.4);
}

/* Footer */
footer {
  background-color: var(--primary-color);
  color: white;
  text-align: center;
  padding: 30px 0;
  margin-top: 60px;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

footer p {
  font-size: 0.95em;
}

/* Responsive Design */
@media (max-width: 768px) {
  header h1 {
    font-size: 2em;
  }

  header .subtitle {
    font-size: 1em;
  }

  .navbar ul {
    gap: 20px;
    flex-wrap: wrap;
  }

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

  .about-section h2,
  .members-section h2 {
    font-size: 1.8em;
  }

  .about-section,
  main {
    padding: 30px 0;
  }
}

@media (max-width: 480px) {
  header {
    padding: 40px 0;
  }

  header h1 {
    font-size: 1.5em;
  }

  .navbar ul {
    flex-direction: column;
    gap: 10px;
  }

  .member-card {
    padding: 20px;
  }
}