:root {
  --primary-color: #007bff;
  --secondary-color: #6c757d;
  --background-color: #f8f9fa;
  --text-color: #333;
  --card-background: #ffffff;
  --border-color: #dee2e6;
  --success-color: #28a745;
  --error-color: #dc3545;
  --input-focus-border: #80bdff;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background-color: var(--background-color);
  color: var(--text-color);
  margin: 0;
  padding: 20px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  line-height: 1.6;
}

.container {
  background-color: var(--card-background);
  padding: 30px 40px;
  border-radius: 12px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 800px;
}

h1 {
  color: var(--primary-color);
  text-align: center;
  margin-bottom: 10px;
  font-weight: 600;
}

.info {
  text-align: center;
  color: var(--secondary-color);
  margin-bottom: 30px;
  font-size: 0.9em;
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 25px;
}

.input-group {
  display: flex;
  flex-direction: column;
}

.input-group label {
  margin-bottom: 8px;
  font-weight: 400;
  color: #555;
  font-size: 0.95em;
}

.input-group input[type="number"] {
  padding: 12px 15px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 1em;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  width: 100%;
  box-sizing: border-box;
}

.input-group input[type="number"]:focus {
  border-color: var(--input-focus-border);
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
  outline: none;
}

.gesamtnote-group {
  margin-top: 10px;
  margin-bottom: 30px;
}

.gesamtnote-group label {
  font-weight: 600;
  color: var(--primary-color);
}

button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 12px 25px;
  border-radius: 6px;
  font-size: 1.1em;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.2s ease;
  display: block;
  width: 100%;
  margin-top: 10px;
}

button:hover {
  background-color: #0056b3;
  transform: translateY(-2px);
}

button:active {
  transform: translateY(0);
}

.ergebnis-bereich {
  margin-top: 30px;
  padding: 20px;
  border-radius: 8px;
  text-align: center;
  font-size: 1.15em;
  font-weight: 500;
  min-height: 60px;
  display: block;
  word-wrap: break-word;
  white-space: normal;
}

.ergebnis-bereich.erfolg {
  background-color: #e6ffed;
  border: 1px solid var(--success-color);
  color: var(--success-color);
}

.ergebnis-bereich.warnung {
  background-color: #fff3cd;
  border: 1px solid #ffeeba;
  color: #856404;
}

.ergebnis-bereich.fehler {
  background-color: #ffebee;
  border: 1px solid var(--error-color);
  color: var(--error-color);
}

@media (max-width: 600px) {
  .container {
    padding: 20px;
  }
  h1 {
    font-size: 1.8em;
  }
  .input-grid {
    grid-template-columns: 1fr;
  }
}