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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f5f5;
    padding: 20px;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 30px;
    overflow-x: auto;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 2em;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 0 auto;
    font-size: 14px;
}

thead {
    background: #4a90e2;
    color: white;
    position: sticky;
    top: 0;
    z-index: 10;
}

th {
    padding: 15px 10px;
    text-align: center;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

th:first-child {
    min-width: 120px;
}

td {
    padding: 8px;
    border: 1px solid #ddd;
    text-align: center;
}

td:first-child {
    background-color: #f8f9fa;
    font-weight: 600;
    color: #333;
    text-align: left;
    padding-left: 15px;
}

tbody tr:nth-child(even) {
    background-color: #f8f9fa;
}

tbody tr:hover {
    background-color: #e9ecef;
}

.button-group {
    display: flex;
    gap: 5px;
    justify-content: center;
    align-items: center;
}

.option-btn {
    flex: 1;
    padding: 8px 12px;
    border: 2px solid #ddd;
    border-radius: 4px;
    background-color: white;
    color: #333;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    min-width: 50px;
}

.option-btn:hover {
    background-color: #f0f0f0;
    border-color: #4a90e2;
}

.option-btn.selected {
    background: #4a90e2;
    color: white;
    border-color: #4a90e2;
}

.option-btn.selected.true-btn {
    background: #28a745;
    border-color: #28a745;
}

.option-btn.selected.false-btn {
    background: #dc3545;
    border-color: #dc3545;
}

.controls {
    margin-bottom: 20px;
    text-align: center;
}

.controls button {
    background: #4a90e2;
    color: white;
    border: 1px solid #357abd;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    margin: 0 5px;
}

.controls button:hover {
    background: #357abd;
}

.controls button:disabled {
    background: #ccc;
    border-color: #aaa;
    cursor: not-allowed;
}