body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f4f7f9;
    color: #333;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 20px auto;
    padding: 30px;
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

h1 {
    color: #2c3e50;
    text-align: center;
    margin-bottom: 10px;
}

.intro-text {
    text-align: center;
    color: #555;
    margin-bottom: 30px;
}

.tabs {
    display: flex;
    border-bottom: 1px solid #ddd;
    margin-bottom: 20px;
}

.tab-button {
    padding: 15px 25px;
    cursor: pointer;
    border: none;
    background-color: transparent;
    font-size: 16px;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
}

.tab-button.active {
    color: #007bff;
    border-bottom-color: #007bff;
    font-weight: bold;
}

.tab-button.disabled {
    color: #aaa;
    cursor: not-allowed;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="text"],
input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    box-sizing: border-box; /* Wichtig für korrekte Breite */
}

.vocab-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

.vocab-table th, .vocab-table td {
    padding: 8px;
    text-align: left;
    vertical-align: middle;
}

.vocab-table th {
    border-bottom: 2px solid #eee;
    color: #555;
}

.vocab-table input {
    width: 98%;
}

.btn-add-row {
    padding: 8px 15px;
    background-color: #f0f0f0;
    border: 1px solid #ccc;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
}

.btn-submit {
    padding: 12px 25px;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    background-color: #28a745;
    color: white;
    display: block;
    width: 100%;
    margin-top: 20px;
}