body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f0f2f5;
  color: #333;
  line-height: 1.6;
}

header {
  background-color: #005f4f;
  color: white;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

header img {
  height: 50px;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h2 {
  margin-top: 0;
}

h3 {
  color: #005f4f;
  border-bottom: 2px solid #005f4f;
  padding-bottom: 0.3rem;
}

a {
  color: #007acc;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Service Card */
.service-card {
  background-color: #f8fafb;
  border: 1px solid #e0e4e8;
  border-left: 4px solid #005f4f;
  border-radius: 6px;
  padding: 1.5rem;
  margin-top: 1rem;
}

.service-card h4 {
  margin-top: 0;
  font-size: 1.3rem;
  color: #005f4f;
}

.service-card h5 {
  margin-top: 1.5rem;
  margin-bottom: 0.3rem;
  color: #555;
}

/* Buttons */
.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.button {
  flex: 1 1 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.5rem;
  background-color: #007acc;
  color: white;
  border-radius: 5px;
  font-weight: bold;
  text-align: center;
  transition: background-color 0.2s;
}

.button:hover {
  background-color: #005f99;
  text-decoration: none;
}

.button-secondary {
  background-color: #5a5a5a;
}

.button-secondary:hover {
  background-color: #4a4a4a;
}

.hint {
  font-size: 0.85rem;
  color: #777;
  font-style: italic;
}

footer {
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
  font-size: 0.9rem;
  background-color: #e4e4e4;
  color: #444;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  body {
    background-color: #1a1a2e;
    color: #e0e0e0;
  }

  header {
    background-color: #003d33;
  }

  main {
    background: #242438;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }

  h3 {
    color: #4ecdc4;
    border-bottom-color: #4ecdc4;
  }

  a {
    color: #5ab8f5;
  }

  .service-card {
    background-color: #2a2a40;
    border-color: #3a3a50;
    border-left-color: #4ecdc4;
  }

  .service-card h4 {
    color: #4ecdc4;
  }

  .service-card h5 {
    color: #b0b0b0;
  }

  .button {
    background-color: #1a8ad4;
  }

  .button:hover {
    background-color: #1572b0;
  }

  .button-secondary {
    background-color: #555568;
  }

  .button-secondary:hover {
    background-color: #43435a;
  }

  .hint {
    color: #999;
  }

  footer {
    background-color: #1e1e30;
    color: #aaa;
  }

  footer a {
    color: #5ab8f5;
  }
}

/* Responsive */
@media (max-width: 600px) {
  header {
    padding: 0.75rem 1rem;
    flex-wrap: wrap;
  }

  header img {
    height: 36px;
  }

  header h1 {
    font-size: 1.15rem;
  }

  main {
    margin: 1rem 0.75rem;
    padding: 1.25rem;
  }

  .service-card {
    padding: 1rem;
  }

  .button-group {
    flex-direction: column;
  }

  .button {
    text-align: center;
  }
}