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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f5f5f5;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.container {
  max-width: 600px;
  width: 100%;
  background: white;
  border-radius: 8px;
  padding: 3rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.logo {
  max-width: 200px;
  height: auto;
  margin-bottom: 2rem;
}

h1 {
  color: #333;
  font-size: 2rem;
  margin-bottom: 2rem;
}

#presentations {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

a {
  display: block;
  padding: 1rem;
  background: #f8f9fa;
  border: 1px solid #dee2e6;
  border-radius: 4px;
  text-decoration: none;
  color: #495057;
  transition: all 0.2s;
}

a:hover {
  background: #e9ecef;
  border-color: #adb5bd;
  color: #212529;
}

.loading,
.error {
  padding: 1rem;
  color: #6c757d;
  font-size: 0.9rem;
}

.error {
  color: #dc3545;
}