/* Base Variables for a fun, premium look */
:root {
    --bg-color: #f0f8ff; /* AliceBlue */
    --text-color: #333;
    --card-bg: #fff;
    --card-back-bg: #87ceeb; /* SkyBlue */
    --card-border: 4px solid #fff;
    --primary-color: #ff6b6b; /* Vibrant coral red */
    --primary-color-hover: #fa5252;
    --secondary-color: #4dabf7; /* Vibrant blue */
    --secondary-color-hover: #3bc9db;
    --success-color: #51cf66; /* Green */
    --highlight-color: #fcc419; /* Yellow/Gold for active player */
    --font-family: 'Nunito', sans-serif;
    --shadow: 0 8px 16px rgba(0,0,0,0.1);
    --border-radius: 12px;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden; /* Avoid scrollbars during animations */
}

#app {
    width: 100%;
    max-width: 1200px;
    height: 100vh;
    position: relative;
    padding: 20px;
}

/* Screen Management */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 20px;
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s ease;
    align-items: center;
    justify-content: center;
}

.screen.active {
    opacity: 1;
    visibility: visible;
    z-index: 10;
}

/* Common Card Style (Config/End screens) */
.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 40px;
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 500px;
    text-align: center;
}

.card h1 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: var(--primary-color);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.05);
}

/* Forms and Inputs */
.config-group {
    margin-bottom: 20px;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #555;
}

select, input {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    font-family: var(--font-family);
    transition: border-color 0.3s;
}

select:focus, input:focus {
    outline: none;
    border-color: var(--secondary-color);
}

/* Buttons */
.btn {
    padding: 15px 30px;
    border: none;
    border-radius: 30px;
    font-size: 1.2rem;
    font-weight: bold;
    font-family: var(--font-family);
    cursor: pointer;
    transition: transform 0.1s, background-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.btn:active {
    transform: scale(0.95);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-color-hover);
    box-shadow: 0 6px 12px rgba(255, 107, 107, 0.3);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--secondary-color-hover);
    box-shadow: 0 6px 12px rgba(77, 171, 247, 0.3);
}

.btn-small {
    padding: 8px 16px;
    font-size: 1rem;
}

.hidden {
    display: none !important;
}

/* === Game Screen Specifics === */

.game-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 20px;
    padding-top: 10px;
}

/* Scoreboard */
.scoreboard {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.player-score {
    background: var(--card-bg);
    padding: 10px 20px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 3px solid transparent;
    transition: border-color 0.3s, transform 0.3s;
}

.player-score.active {
    border-color: var(--highlight-color);
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(252, 196, 25, 0.5);
}

.player-name {
    font-weight: 900;
    font-size: 1.1rem;
}

.player-stats {
    font-size: 0.9rem;
    color: #666;
}

/* Game Board */
.game-board-container {
    flex-grow: 1;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 10px;
}

.game-board {
    display: grid;
    gap: 15px;
    /* Grid template will be set dynamically via JS */
    perspective: 1000px; /* For 3D flip effect */
    max-width: 100%;
    max-height: 100%;
}

/* Playing Card */
.play-card {
    width: 100px;
    height: 140px; /* Adjust aspect ratio as needed */
    position: relative;
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.play-card.flipped {
    transform: rotateY(180deg);
}

.play-card.matched {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease 0.5s, visibility 0.5s ease 0.5s; /* Fade out after a short delay */
}

/* The red outline for a match before disappearing */
.play-card.match-highlight .card-face {
    outline: 4px solid red;
    outline-offset: -4px;
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: var(--border-radius);
    backface-visibility: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
    overflow: hidden;
}

.card-back {
    background-color: var(--card-back-bg);
    border: var(--card-border);
    /* Adding a subtle pattern could be nice here */
    background-image: radial-gradient(white 15%, transparent 16%), radial-gradient(white 15%, transparent 16%);
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
}

.card-front {
    background-color: var(--card-bg);
    border: var(--card-border);
    transform: rotateY(180deg);
}

.card-front img {
    max-width: 80%;
    max-height: 80%;
    object-fit: contain;
}

/* === End Screen Specifics === */
.rankings {
    margin-bottom: 30px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.rank-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
    font-size: 1.2rem;
    font-weight: bold;
}

.rank-item.winner {
    background-color: #fff3cd;
    border-left: 5px solid var(--highlight-color);
}

.stars {
    color: var(--highlight-color);
    font-size: 1.5rem;
}

.end-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .card {
        padding: 20px;
    }
    
    .play-card {
        width: 70px;
        height: 100px;
    }
    
    .scoreboard {
        gap: 8px;
    }
    
    .player-score {
        padding: 6px 12px;
    }
}