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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #2E8B57 0%, #228B22 100%);
    min-height: 100vh;
    color: white;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

.back-btn {
    color: white;
    text-decoration: none;
    font-size: 1.2rem;
    position: absolute;
    top: 2rem;
    left: 2rem;
}

.bingo-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    color: black;
}

.bingo-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.bingo-cell {
    border: 2px solid #ddd;
    border-radius: 10px;
    padding: 1rem;
    text-align: center;
    transition: all 0.3s ease;
}

.bingo-cell.correct {
    background-color: #4CAF50;
    color: white;
    border-color: #4CAF50;
}

.bingo-cell.incorrect {
    background-color: #f44336;
    color: white;
    border-color: #f44336;
}

.cell-header {
    font-weight: bold;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.cell-club {
    font-size: 0.8rem;
    color: #666;
    margin-bottom: 1rem;
}

.player-input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    text-align: center;
    font-size: 0.9rem;
}

.player-input:disabled {
    background-color: transparent;
    border: none;
    color: inherit;
    font-weight: bold;
}

.controls {
    text-align: center;
}

.controls button {
    background: #FF6B35;
    color: white;
    border: none;
    padding: 1rem 2rem;
    margin: 0.5rem;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

.controls button:hover {
    background: #e55a2b;
}

.loading-spinner {
    font-size: 1.2rem;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.bingo-cell.loading {
    background-color: #f0f0f0;
}