/* Swiss Minimalist Design */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    padding: 3rem 1rem 2rem;
    background-color: #fff;
    border-bottom: 1px solid #e0e0e0;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
    color: #000;
}

.subtitle {
    font-size: 1rem;
    color: #666;
    font-weight: 300;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

.subtitle a {
    color: #000;
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid #000;
}

.subtitle a:hover {
    opacity: 0.7;
}

main {
    flex: 1;
    padding: 2rem 1rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.bingo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin: 0 auto;
}

.bingo-card {
    background-color: #fff;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    border: 2px solid #000;
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: visible;
}

.bingo-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('images/6902836893_1d499713fe_c.jpg');
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 0.2s ease;
    z-index: 0;
}

.bingo-card:hover::before {
    opacity: 0.7;
}

.bingo-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.bingo-card:hover .bingo-card-text {
    color: #fff;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
    z-index: 1;
}

.bingo-card:hover .tooltip {
    opacity: 1;
    visibility: visible;
    background-color: #fff;
    color: #000;
}

.bingo-card.clicked {
    background-color: #000;
    color: #fff;
}

.bingo-card-text {
    font-size: 1.1rem;
    font-weight: 500;
    line-height: 1.4;
    word-wrap: break-word;
    hyphens: auto;
    width: 100%;
    position: relative;
    z-index: 1;
    transition: color 0.2s ease, text-shadow 0.2s ease;
}

/* Dynamically adjust font size for long text */
.bingo-card-text.small {
    font-size: 0.9rem;
}

.bingo-card-text.smaller {
    font-size: 0.75rem;
}

/* Tooltip styling */
.tooltip {
    position: absolute;
    bottom: -5px;
    right: -5px;
    width: 24px;
    height: 24px;
    background-color: #000;
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: bold;
    cursor: help;
    z-index: 10;
    transition: all 0.2s ease;
}

.tooltip:hover {
    transform: scale(1.1);
}

.tooltip-content {
    position: absolute;
    bottom: 100%;
    right: 0;
    margin-bottom: 10px;
    padding: 0.75rem;
    background-color: #000;
    color: #fff;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: normal;
    line-height: 1.4;
    white-space: normal;
    width: 250px;
    max-width: 80vw;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    pointer-events: none;
    text-align: left;
    z-index: 100;
}

.tooltip:hover .tooltip-content {
    opacity: 1;
    visibility: visible;
}

.tooltip-content::after {
    content: '';
    position: absolute;
    top: 100%;
    right: 10px;
    border: 6px solid transparent;
    border-top-color: #000;
}

/* Markdown formatting in tooltip */
.tooltip-content strong {
    font-weight: 700;
    color: #fff;
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    background-color: #fff;
    border-top: 1px solid #e0e0e0;
    margin-top: 2rem;
}

footer p {
    margin: 0.5rem 0;
    color: #666;
}

footer a {
    color: #000;
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid #000;
}

footer a:hover {
    opacity: 0.7;
}

/* Confetti animation */
.confetti {
    position: fixed;
    font-size: 2rem;
    pointer-events: none;
    z-index: 1000;
    animation: fall linear forwards;
}

@keyframes fall {
    to {
        transform: translateY(100vh) rotate(360deg);
        opacity: 0;
    }
}

/* Credits page */
.credits-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    background-color: #fff;
    border: 2px solid #000;
}

.credits-container h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.credits-container h2:first-child {
    margin-top: 0;
}

.credits-container p {
    margin-bottom: 1rem;
    line-height: 1.6;
}

.credits-container ul {
    list-style: disc;
    margin-left: 2rem;
    line-height: 1.8;
}

.credits-container a {
    color: #000;
    text-decoration: none;
    border-bottom: 1px solid #000;
}

.credits-container a:hover {
    opacity: 0.7;
}

/* Responsive design */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .bingo-grid {
        grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
        gap: 0.75rem;
    }
    
    .bingo-card {
        padding: 0.75rem;
    }
    
    .bingo-card-text {
        font-size: 1rem;
    }
    
    .bingo-card-text.small {
        font-size: 0.85rem;
    }
    
    .bingo-card-text.smaller {
        font-size: 0.7rem;
    }
    
    .tooltip-content {
        width: 200px;
    }
}

@media (max-width: 480px) {
    header {
        padding: 2rem 1rem 1.5rem;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    .bingo-grid {
        grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
        gap: 0.5rem;
    }
    
    .bingo-card {
        padding: 0.5rem;
    }
    
    .bingo-card-text {
        font-size: 0.9rem;
    }
    
    .bingo-card-text.small {
        font-size: 0.75rem;
    }
    
    .bingo-card-text.smaller {
        font-size: 0.65rem;
    }
    
    .tooltip {
        width: 20px;
        height: 20px;
        font-size: 0.7rem;
    }
    
    .tooltip-content {
        width: 180px;
        font-size: 0.8rem;
    }
}