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

:root {
    --pink: #ff1493;
    --cyan: #00ffff;
    --yellow: #ffff00;
    --bg-dark: #000000;
    --bg-card: #1a1a1a;
    --text-light: #ffffff;
    --text-muted: #cccccc;
    --border-color: #333333;
    --marked-bg: #2a2a2a;
    --marked-border: var(--cyan);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-dark);
    color: var(--text-light);
    min-height: 100vh;
    padding: 20px;
    position: relative;
}

.logo-link {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1000;
    display: block;
    transition: transform 0.3s ease;
}

.logo-link:hover {
    transform: scale(1.1);
}

.site-logo {
    width: 80px;
    height: auto;
    display: block;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--pink), var(--cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: var(--yellow);
    color: var(--bg-dark);
}

.btn-primary:hover {
    background: #ffff66;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 255, 0, 0.4);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-light);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-dark);
    border-color: var(--pink);
    transform: translateY(-2px);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.bingo-card-container {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
}

.bingo-card {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    background: var(--bg-card);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    max-width: 600px;
    width: 100%;
}

.bingo-square {
    aspect-ratio: 1;
    background: var(--bg-dark);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
    text-align: center;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    color: var(--text-light);
    word-wrap: break-word;
    overflow: hidden;
}

.bingo-square:hover {
    border-color: var(--cyan);
    transform: scale(1.05);
    background: #1a1a1a;
}

.bingo-square.marked {
    background: var(--marked-bg);
    border-color: var(--marked-border);
    border-width: 3px;
}

.bingo-square.marked::after {
    content: '✓';
    position: absolute;
    top: 5px;
    right: 5px;
    color: var(--yellow);
    font-size: 1.5rem;
    font-weight: bold;
}

.bingo-square.free-space {
    background: linear-gradient(135deg, var(--cyan), var(--pink));
    color: var(--bg-dark);
    font-weight: bold;
    font-size: 1.1rem;
    cursor: default;
    padding: 5px;
}

.bingo-square.free-space .free-space-logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.bingo-square.free-space:hover {
    transform: none;
    border-color: var(--yellow);
}

footer {
    text-align: center;
    color: var(--text-muted);
    margin-top: 30px;
}

/* Print Styles */
@media print {
    body {
        background: white;
        padding: 0;
    }

    .container {
        max-width: 100%;
    }

    header h1 {
        -webkit-text-fill-color: #000;
        color: #000;
    }

    .subtitle {
        color: #666;
    }

    .controls {
        display: none;
    }

    .bingo-card {
        box-shadow: none;
        background: white;
        padding: 10px;
        page-break-inside: avoid;
    }

    .bingo-square {
        background: white;
        border: 2px solid #000;
        color: #000;
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }

    .bingo-square.marked {
        background: #f0f0f0;
        border: 3px solid #000;
    }

    .bingo-square.marked::after {
        color: #000;
    }

    .bingo-square.free-space {
        background: linear-gradient(135deg, #ccffff, #ffcccc);
        border: 2px solid #000;
        color: #000;
    }

    .bingo-square.free-space .free-space-logo {
        width: 100%;
        height: 100%;
        object-fit: contain;
    }

    footer {
        display: none;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .bingo-card {
        padding: 15px;
        gap: 6px;
    }

    .bingo-square {
        font-size: 0.75rem;
        padding: 8px;
    }

    .bingo-square.free-space {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .logo-link {
        top: 10px;
        left: 10px;
    }

    .site-logo {
        width: 60px;
    }

    h1 {
        font-size: 1.75rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .bingo-card {
        padding: 10px;
        gap: 4px;
    }

    .bingo-square {
        font-size: 0.65rem;
        padding: 6px;
    }

    .bingo-square.free-space {
        font-size: 0.9rem;
    }
}