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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: linear-gradient(135deg, #0f0c1d 0%, #1a1628 25%, #1e1a35 50%, #1a1628 75%, #0f0c1d 100%);
    min-height: 100vh;
    color: #fff;
    overflow-x: hidden;
    position: relative;
}

/* Subtle animated background stars */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(1.5px 1.5px at 20% 30%, rgba(255, 215, 0, 0.8), transparent),
        radial-gradient(1.5px 1.5px at 60% 70%, rgba(255, 215, 0, 0.6), transparent),
        radial-gradient(1px 1px at 50% 50%, rgba(255, 215, 0, 0.7), transparent),
        radial-gradient(1px 1px at 80% 10%, rgba(255, 215, 0, 0.5), transparent),
        radial-gradient(1.5px 1.5px at 90% 40%, rgba(255, 215, 0, 0.6), transparent),
        radial-gradient(1px 1px at 33% 60%, rgba(255, 215, 0, 0.5), transparent),
        radial-gradient(1px 1px at 10% 80%, rgba(255, 215, 0, 0.6), transparent);
    background-size: 200% 200%;
    animation: sparkle 25s linear infinite;
    opacity: 0.4;
    z-index: 0;
    pointer-events: none;
}

@keyframes sparkle {
    0% { background-position: 0% 0%; }
    100% { background-position: 100% 100%; }
}

.container {
    position: relative;
    z-index: 1;
    padding: 15px;
    max-width: 1200px;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.view {
    display: none;
    height: 100%;
}

.view.active {
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 12px;
    padding: 10px 20px;
    flex-shrink: 0;
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 5px;
    text-shadow: 
        0 0 10px rgba(255, 215, 0, 0.5),
        0 0 20px rgba(255, 215, 0, 0.3),
        0 2px 4px rgba(0, 0, 0, 0.5);
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 50%, #ffd700 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    letter-spacing: 1px;
    line-height: 1.2;
}

.subtitle {
    font-size: 0.9rem;
    color: #b8b8c8;
    opacity: 0.85;
    font-weight: 400;
}

.board-container {
    background: rgba(15, 12, 29, 0.9);
    border-radius: 12px;
    padding: 12px;
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 215, 0, 0.15);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.categories-row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin-bottom: 10px;
    flex-shrink: 0;
}

.category-header {
    background: #4a90e2;
    padding: 10px 8px;
    text-align: center;
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: 8px;
    box-shadow: 
        0 3px 8px rgba(74, 144, 226, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    text-transform: uppercase;
    letter-spacing: 0.6px;
    border: 1.5px solid rgba(255, 215, 0, 0.4);
    color: #fff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    transition: all 0.2s ease;
}

.board {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 10px;
    row-gap: 10px;
    column-gap: 10px;
    flex: 1;
    min-height: 0;
}

.tile {
    aspect-ratio: 1;
    background: #4a90e2;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 2px 6px rgba(74, 144, 226, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border: 1.5px solid rgba(255, 215, 0, 0.4);
    position: relative;
    overflow: hidden;
    width: 100%;
    height: 100%;
    margin: 0;
}

.tile::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.15);
    opacity: 0;
    transition: opacity 0.25s ease;
    border-radius: 8px;
}

.tile:hover::before {
    opacity: 1;
}

.tile:hover {
    box-shadow: 
        0 4px 12px rgba(74, 144, 226, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 215, 0, 0.7);
    background: #5ba0f2;
}

.tile.used {
    background: #1a1a1a;
    cursor: not-allowed;
    opacity: 1;
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 
        0 2px 6px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.tile.used:hover {
    transform: none;
    box-shadow: 
        0 2px 6px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    background: #1a1a1a;
}

.tile.used::before {
    display: none;
}

.tile.used .point-value {
    opacity: 0.35;
    filter: grayscale(0.3);
}

.point-value {
    position: relative;
    z-index: 1;
    text-shadow: 
        0 2px 4px rgba(0, 0, 0, 0.5),
        0 0 8px rgba(0, 0, 0, 0.3);
    color: #fff;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.tile.has-image {
    background-blend-mode: overlay;
    background-color: rgba(74, 144, 226, 0.7);
}

.tile.has-image .point-value {
    text-shadow: 
        0 0 8px rgba(0, 0, 0, 0.9),
        0 2px 4px rgba(0, 0, 0, 0.8),
        0 0 12px rgba(0, 0, 0, 0.7);
    font-size: 1.4rem;
}

.reset-btn {
    display: block;
    margin: 10px auto 0;
    padding: 8px 24px;
    font-size: 0.85rem;
    background: #fd79a8;
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 3px 10px rgba(232, 67, 147, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    flex-shrink: 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.reset-btn:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 6px 16px rgba(232, 67, 147, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.25);
    background: #ff8ab8;
}

.reset-btn:active {
    transform: translateY(0);
}

/* Question View Styles */
.question-container {
    max-width: 750px;
    margin: auto;
    background: rgba(20, 18, 35, 0.85);
    border-radius: 20px;
    padding: 35px;
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 215, 0, 0.2);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 100%;
    max-height: 90vh;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid rgba(255, 215, 0, 0.25);
    flex-shrink: 0;
}

.category-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: #ffd700;
    text-transform: uppercase;
    letter-spacing: 1.8px;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.3);
}

.question-header .point-value {
    font-size: 1.3rem;
    font-weight: 700;
    background: #4a90e2;
    padding: 8px 20px;
    border-radius: 24px;
    box-shadow: 
        0 3px 10px rgba(74, 144, 226, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border: 1.5px solid rgba(255, 215, 0, 0.4);
    color: #fff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.question-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    text-align: center;
    overflow-y: auto;
    padding: 15px 0;
    min-height: 0;
}

.question-content h2 {
    font-size: 1.7rem;
    line-height: 1.6;
    color: #fff;
    text-shadow: 
        0 2px 4px rgba(0, 0, 0, 0.5),
        0 0 20px rgba(0, 0, 0, 0.3);
    font-weight: 400;
    max-width: 100%;
}

.question-image {
    max-width: 60%;
    max-height: 300px;
    width: auto;
    height: auto;
    border-radius: 12px;
    margin: 20px 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    display: block;
    object-fit: contain;
}

.answer-section {
    margin-top: 20px;
    padding: 20px;
    background: rgba(74, 144, 226, 0.15);
    border-radius: 12px;
    border: 1px solid rgba(255, 215, 0, 0.3);
    animation: fadeIn 0.3s ease;
    flex-shrink: 0;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.answer-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: #ffd700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.answer-text {
    font-size: 1.4rem;
    line-height: 1.6;
    color: #fff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
    font-weight: 400;
}

.hidden {
    display: none !important;
}

.question-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex-shrink: 0;
    margin-top: 20px;
}

.show-answer-btn {
    padding: 12px 35px;
    font-size: 0.95rem;
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    color: #1a1a2e;
    border: none;
    border-radius: 28px;
    cursor: pointer;
    font-weight: 700;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 4px 12px rgba(255, 215, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    align-self: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.show-answer-btn:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 6px 16px rgba(255, 215, 0, 0.6),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
    background: linear-gradient(135deg, #ffed4e 0%, #ffd700 100%);
}

.show-answer-btn:active {
    transform: translateY(0);
}

.back-btn {
    margin-top: 0;
    padding: 10px 30px;
    font-size: 0.9rem;
    background: #4a90e2;
    color: white;
    border: none;
    border-radius: 24px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 3px 10px rgba(74, 144, 226, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    align-self: center;
    flex-shrink: 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.back-btn:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 5px 14px rgba(74, 144, 226, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.25);
    background: #5ba0f2;
}

.back-btn:active {
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }
    
    header {
        margin-bottom: 15px;
        padding: 12px 15px;
    }
    
    header h1 {
        font-size: 1.6rem;
    }
    
    .subtitle {
        font-size: 0.8rem;
    }
    
    .board-container {
        padding: 12px;
    }
    
    .categories-row,
    .board {
        gap: 8px;
    }
    
    .category-header {
        font-size: 0.8rem;
        padding: 10px 8px;
    }
    
    .tile {
        font-size: 1.3rem;
    }
    
    .question-container {
        padding: 25px 20px;
    }
    
    .question-content h2 {
        font-size: 1.3rem;
    }
    
    .question-header .point-value {
        font-size: 1.2rem;
        padding: 8px 18px;
    }
    
    .category-name {
        font-size: 0.95rem;
    }
}