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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #fafafa;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  background-color: white;
  min-height: 100vh;
  box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

.banner {
  width: 100%;
  height: 300px;
  background-image: url('/images/hoa_banner.webp');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  margin-bottom: 0;
}

header {
  text-align: center;
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 2px solid #e0e0e0;
}

h1 {
  font-size: 2.2rem;
  color: #2c3e50;
  margin-bottom: 10px;
  font-weight: 600;
}

h2 {
  font-size: 1.5rem;
  color: #34495e;
  margin: 30px 0 15px 0;
  font-weight: 600;
}

h3 {
  font-size: 1.2rem;
  color: #2c3e50;
  margin: 25px 0 10px 0;
  font-weight: 600;
}

p {
  margin-bottom: 15px;
  font-size: 1.1rem;
}

.highlight-box {
  background-color: #e8f4f8;
  border-left: 4px solid #3498db;
  padding: 20px;
  margin: 20px 0;
  border-radius: 4px;
}

.welcome {
  background-color: #f8f9fa;
  border: 1px solid #dee2e6;
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
}

.members {
  background-color: #f9f9f9;
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
}

.board-members {
  background-color: #f9f9f9;
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
}

.board-list {
  list-style: none;
  padding: 0;
}

.board-list li {
  padding: 8px 0;
  border-bottom: 1px solid #e0e0e0;
}

.board-list li:last-child {
  border-bottom: none;
}

.contact-section {
  background-color: #f9f9f9;
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
}

.position {
  font-weight: 600;
  color: #2c3e50;
}

a {
  color: #3498db;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.rsvp-section {
  background-color: #fff3cd;
  border: 1px solid #ffeaa7;
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
}

ul {
  margin-left: 20px;
  margin-bottom: 15px;
}

ul li {
  margin: 5px 0;
}

footer {
  border-top: 1px solid #e0e0e0;
  padding-top: 1rem;
  margin-top: 2rem;
  font-size: 0.85rem;
  color: #888;
  text-align: center;
}

@media (max-width: 768px) {
  .container {
    padding: 15px;
  }
  h1 {
    font-size: 1.8rem;
  }
  h2 {
    font-size: 1.3rem;
  }
}