:root {
    --color-primary: #FF5A5F;
    --color-secondary: #00A699;
    --color-success: #78BD4C;
    --color-green-btn: #4CAF50;
    --color-error: #F38181;
    --color-bg-light: #F7F9FF;
    --color-card-front: #FFD700;
    --color-selected-border: var(--color-primary);
    --color-modal-bg: rgba(0, 0, 0, 0.7);
}

#letter-match-game-wrapper {
    font-family: 'Lexend Exa', sans-serif;
    background-color: var(--color-bg-light); 
    color: #333;
    display: flex; 
    flex-direction: column;
    align-items: center;
    min-height: 500px; 
    margin: 0;
    padding: 0px 0;
    box-sizing: border-box;
    line-height: 1.6;
    position: relative; 
    width: 100%;
    border-radius: 20px; 
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

#letter-match-game-wrapper .container {
    max-width: 900px;
    width: 100%;
    padding: 20px;
    background: linear-gradient(135deg, #fff 0%, #fefefe 100%);
    border-radius: 20px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    position: relative;
}

#letter-match-game-wrapper h1 {
    color: var(--color-primary);
    text-align: center;
    font-size: clamp(1.8rem, 5vw, 3rem);
    margin-bottom: 0.5rem;
    text-shadow: 3px 3px 5px rgba(0, 0, 0, 0.15);
    flex-shrink: 0; 
}

#letter-match-game-wrapper .controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    flex-shrink: 0;
}

#letter-match-game-wrapper .score-board {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--color-secondary);
    background-color: #e6f7f6;
    padding: 8px 15px;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    min-width: 150px;
    text-align: center;
}

#letter-match-game-wrapper .btn {
    background: linear-gradient(45deg, var(--color-primary), #FF4D6D); 
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer !important; 
    transition: all 0.2s ease-in-out;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(255, 90, 95, 0.4);
    margin: 5px;
}

#letter-match-game-wrapper .btn:hover {
    opacity: 0.9;
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(255, 90, 95, 0.6);
}
#letter-match-game-wrapper .btn:active {
    transform: translateY(0);
    box-shadow: 0 3px 8px rgba(255, 90, 95, 0.4);
}

#letter-match-game-wrapper #new-game-btn,
#letter-match-game-wrapper #message .btn {
     background: linear-gradient(45deg, var(--color-green-btn), var(--color-success));
     box-shadow: 0 4px 10px rgba(76, 175, 80, 0.4);
}

#letter-match-game-wrapper #new-game-btn:hover,
#letter-match-game-wrapper #message .btn:hover {
     box-shadow: 0 8px 15px rgba(76, 175, 80, 0.6);
}

#letter-match-game-wrapper #game-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr); 
    gap: 10px;
    padding: 10px;
    background-color: #EBF5FF;
    border-radius: 10px;
    box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.1);
    flex-grow: 1; 
    align-content: center;
    min-height: 0; 
}

#letter-match-game-wrapper .welcome-message {
    display: none; 
    grid-column: 1 / -1;
    text-align: center;
    font-size: 1.2rem;
    padding: 30px;
    color: var(--color-secondary);
}

@media (min-width: 600px) {
    #letter-match-game-wrapper #game-board {
        grid-template-columns: repeat(6, 1fr); 
        gap: 12px; 
    }
}

#letter-match-game-wrapper .card {
    aspect-ratio: 1 / 1;
    cursor: pointer !important; 
    user-select: none;
    position: relative;
    
    background: var(--color-card-front);
    border: 4px solid white;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s, opacity 0.2s;

    display: flex;
    justify-content: center;
    align-items: center;
    font-size: clamp(1.5rem, 7vw, 3.5rem);
    font-weight: 700;
}

#letter-match-game-wrapper .card:hover:not(.matched) {
    transform: scale(1.05);
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.25);
    cursor: pointer !important;
}

#letter-match-game-wrapper .card.selected {
    border-color: var(--color-selected-border);
    background-color: #FFFFAA;
    box-shadow: 0 0 15px var(--color-selected-border), 0 0 25px rgba(255, 90, 95, 0.8);
    transform: scale(1.08);
    cursor: pointer !important;
}

#letter-match-game-wrapper .card.matched {
    cursor: default;
    background: #D5F5E3;
    box-shadow: 0 0 0 5px var(--color-success);
    opacity: 0.8;
}

#letter-match-game-wrapper .color-0 { color: #E74C3C; }
#letter-match-game-wrapper .color-1 { color: #2980B9; }
#letter-match-game-wrapper .color-2 { color: #27AE60; }
#letter-match-game-wrapper .color-3 { color: #8E44AD; }
#letter-match-game-wrapper .color-4 { color: #F39C12; }
#letter-match-game-wrapper .color-5 { color: #D35400; }
#letter-match-game-wrapper .color-6 { color: #1ABC9C; }
#letter-match-game-wrapper .color-7 { color: #C0392B; }
#letter-match-game-wrapper .color-8 { color: #2C3E50; }
#letter-match-game-wrapper .color-9 { color: #34495E; }
#letter-match-game-wrapper .color-10 { color: #E67E22; }
#letter-match-game-wrapper .color-11 { color: #E91E63; }

#letter-match-game-wrapper #message {
     position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--color-modal-bg);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
    z-index: 1000;
}

#letter-match-game-wrapper #message.active {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
}

#letter-match-game-wrapper #message > div {
     background-color: white;
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    max-width: 90%;
    transform: scale(0.9);
    transition: transform 0.3s ease-out;
}

#letter-match-game-wrapper #message.active > div {
    transform: scale(1);
}

#letter-match-game-wrapper #message h2 {
    color: var(--color-success);
    font-size: 2rem;
    margin-top: 0;
}