body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #121212;
  color: #f0f0f0;
  margin: 0;
  padding: 0;
}

header {
  text-align: center;
  background-color: #1e1e1e;
  padding: 1.5rem 0;
  border-bottom: 2px solid #333;
}

.header-logo {
    width: 300px;
    display: block;
    margin: 0 auto; /* zentriert das Logo */
}

h1 {
  margin: 0;
}

.button-container {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin: 1rem 0;
}

.button-container button {
  background-color: #333;
  color: #f0f0f0;
  border: none;
  padding: 0.6rem 1.2rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s ease;
}

.button-container button:hover {
  background-color: #555;
}

#regenerate-btn {
  padding: 0.8rem 1.4rem;
}

.challenge-card {
  background-color: #1f1f1f;
  border-radius: 10px;
  padding: 1.5rem;
  width: 100%;
  max-width: 350px;
  box-shadow: 0 0 10px rgba(0,0,0,0.4);
  transition: transform 0.2s ease, box-shadow 0.3s ease;
}

.challenge-card:hover {
  transform: scale(1.02);
  box-shadow: 0 0 20px rgba(0,0,0,0.6);
}

.challenge-card ul.tasks {
  list-style: disc;
  padding-left: 1.2rem;
  margin-bottom: 1rem;
}

#active-challenge-container ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 1rem;
}

.challenge-logo {
  width: 80px;
  height: 80px;
  object-fit: contain;
  display: block;
  margin: 0 auto 1rem auto;
}

h2, h3 {
  text-align: center;
  margin: 0.5rem 0;
  color: #f0f0f0;
}

.description {
  font-size: 0.9rem;
  color: #ccc;
  margin: 0.5rem 0 1rem 0;
  text-align: center;
}

#challenge-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  justify-items: center;
  align-items: start;
  max-width: 1200px;
  margin: 0 auto 2rem auto;
  padding: 0 1rem;
}

#completed-container {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-width: 500px;
  margin: 0 auto 2rem auto;
  padding: 0 1rem;
}

#active-challenge-section {
  text-align: center;
  background-color: #1f1f1f;
  margin: 1.5rem auto;
  padding: 1.5rem;
  border-radius: 10px;
  width: 90%;
  max-width: 800px;
  box-shadow: 0 0 10px rgba(0,0,0,0.4);
}

#active-challenge-container {
  text-align: left;
  background-color: #1e1e1e;
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: 0 0 10px rgba(0,0,0,0.3);
  font-size: 0.95rem;
  color: #ccc;
}

#active-challenge-container ul {
  list-style: none;
  padding: 0;
  margin-bottom: 1rem;
}

#active-challenge-container img {
  display: block;
  margin: 0 auto 1rem auto;
  width: 150px;
  height: 150px;
  object-fit: contain;
}

#active-challenge-container li {
  margin: 0.4rem 0;
}

#active-challenge-container input[type="checkbox"] {
  accent-color: gold;
}

.star-rating {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.stars {
  display: inline-block;
  font-family: monospace;
}

.stars span.filled {
  color: gold;
}

.stars span.empty {
  color: white;
}

.choose-btn,
#completed-btn {
  display: block;
  margin: 1rem auto 0 auto;
  background-color: #333;
  color: #f0f0f0;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.choose-btn:hover,
#completed-btn:hover {
  background-color: #555;
}

.tasks {
  list-style: none;
  padding: 0;
  margin-bottom: 1rem;
}

.tasks li {
  margin: 0.4rem 0;
}

.challenge-logo {
  width: 150px;
  height: 150px;
  object-fit: contain;
  display: block;
  margin: 0 auto 1rem auto;
}

.completed-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: #1f1f1f;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  box-shadow: 0 0 5px rgba(0,0,0,0.3);
}

.check-icon {
  width: 24px;
  height: 24px;
  margin-right: 0.8rem;
}

.completed-name {
  flex: 1;
  color: #f0f0f0;
  font-weight: 500;
}

.remove-btn {
  background-color: #800000;
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 0.2rem 0.6rem;
  cursor: pointer;
  font-weight: bold;
  transition: background-color 0.3s;
}

.remove-btn:hover {
  background-color: #ff0000;
}

.active-header {
  position: relative;
  text-align: center;
  margin-bottom: 1rem;
}

.active-header h3 {
  margin: 0;
}

.remove-active-btn {
  position: absolute;
  top: -0.5rem;
  right: 0;
  background-color: #800000;
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 0.2rem 0.6rem;
  cursor: pointer;
  font-weight: bold;
  transition: background-color 0.3s;
}

.remove-active-btn:hover {
  background-color: #ff0000;
}