:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b; /* Color oscuro para casillas oscuras y texto oscuro */
    --accent-color: #38bdf8;
    --text-color: #f1f5f9; /* Color claro para casillas claras y texto claro */
    --text-muted: #94a3b8;
    --border-color: #334155;
    --code-bg: #0b0f19;
    --success: #10b981;
    --warning: #f59e0b;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    padding: 2rem; /* Default padding for body, can be overridden */
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

header {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

h1 {
    color: var(--accent-color);
    margin: 0 0 0.5rem 0;
    font-size: 2.2rem;
}

h2 {
    color: var(--accent-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-top: 2rem;
}

h3 {
    color: var(--text-color);
    margin-top: 1.5rem;
}

p, li {
    color: var(--text-color);
}

code {
    font-family: "Courier New", Courier, monospace;
    background-color: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    color: #f472b6;
    font-size: 0.9em;
}

pre {
    background-color: var(--code-bg);
    border: 1px solid var(--border-color);
    padding: 1.2rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1rem 0;
}

pre code {
    color: #38bdf8;
    background: none;
    padding: 0;
}

.grid-3x3 {
    display: grid;
    grid-template-columns: repeat(3, 80px);
    grid-gap: 5px;
    margin: 1.5rem auto;
    justify-content: center;
}

.cell {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.dark-cell {
    background-color: var(--card-bg); /* Oscuro: #1e293b */
    color: var(--text-color); /* Texto claro para contraste */
}

.light-cell {
    background-color: var(--text-color); /* Claro: #f1f5f9 */
    color: var(--card-bg); /* Texto oscuro para contraste */
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.6rem;
    font-size: 0.8rem;
    font-weight: bold;
    border-radius: 50px;
    text-transform: uppercase;
}

.badge-danger { background-color: #ef4444; color: white; }
.badge-warning { background-color: #f59e0b; color: white; }
.badge-info { background-color: #3b82f6; color: white; }

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.note {
    border-left: 4px solid var(--warning);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-muted);
}

/* Styles specific to pieces for consistency */
.piece-card {
    background-color: #FFFFFF; /* Fondo blanco para las tarjetas */
    color: var(--card-bg); /* Texto oscuro para contraste */
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 150px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.piece-symbol {
    font-size: 5rem; /* Tamaño grande para el símbolo */
    line-height: 1;
    margin-bottom: 10px;
    color: var(--text-color); /* Color claro para el símbolo (blanco) */
    text-shadow: 1px 1px 2px var(--card-bg), -1px -1px 2px var(--card-bg), 1px -1px 2px var(--card-bg), -1px 1px 2px var(--card-bg); /* Sombra oscura para el contorno */
}

.piece-name {
    font-size: 1.5rem;
    font-weight: bold;
}

/* Styles for challenges */
.challenge-card {
    background-color: var(--card-bg); /* Fondo de la tarjeta de desafío */
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    width: fit-content; /* Ajustar al contenido del tablero */
}

.challenge-card h2 {
    color: var(--text-color);
    margin-bottom: 15px;
    font-size: 1.8rem;
}

/* Specific styles for the grid inside the challenge card */
.challenge-card .grid-3x3 {
    grid-template-columns: repeat(3, 50px); /* Smaller cells */
    grid-gap: 2px; /* Smaller gap */
    margin: 10px auto; /* Adjust margin */
}

.challenge-card .cell {
    width: 50px; /* Match grid-template-columns */
    height: 50px; /* Match grid-template-columns */
    font-size: 0.7rem; /* Smaller font for cell numbers if any */
}

.challenge-card .piece-symbol {
    font-size: 2.2rem; /* Even smaller pieces for the challenge card */
}

.challenge-card h2 {
    color: var(--text-color);
    font-size: 1.4rem; /* Slightly smaller title for challenge card */
}

.challenge-card {
    margin: 0; /* Ensure no external margins interfere with flex layout */
}

/* Styles for highlighting possible moves */
.cell.highlight-move {
    background-color: var(--accent-color); /* Highlight with accent color */
    opacity: 0.8;
    cursor: pointer;
}

/* Style for the cell containing the currently selected piece */
.cell.selected-piece-cell {
    border: 2px solid var(--accent-color); /* Thicker border for selected piece */
    box-shadow: 0 0 10px var(--accent-color);
}


/* Navigation styles */
.nav-links {
    margin-bottom: 2rem;
    text-align: center;
}

.nav-links a {
    color: var(--accent-color);
    margin: 0 10px;
    text-decoration: none;
    font-weight: bold;
}

.back-to-doc {
    position: absolute;
    top: 20px;
    left: 20px;
}

.back-to-doc a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: bold;
}

/* Styles specific to the main game page (index.html) */
.main-game-body { /* Use a class for the body to apply specific styles */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 0; /* Remove padding to eliminate the "doble fondo" effect */
}

.game-container {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 30px; /* Internal padding for content */
    text-align: center; /* This centers h1, p, and controls */
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    max-width: 900px; /* Increased to accommodate board and challenge card side-by-side */
    width: 100%;
    margin: 20px auto; /* Add margin for spacing on smaller screens and center */
}

.game-content-wrapper {
    display: flex;
    justify-content: center;
    align-items: flex-start; /* Align items to the top */
    gap: 30px; /* Space between board and challenge card */
    flex-wrap: wrap; /* Allow wrapping on smaller screens */
    margin-top: 30px; /* Vertical spacing for the wrapper */
    margin-bottom: 30px; /* Vertical spacing for the wrapper */
}

.game-container h1 {
    margin-bottom: 20px;
}

/* Remove specific margins from game-board-area as game-content-wrapper handles spacing */
.game-board-area {
    margin: 0;
}

/* Controls margin is fine as is */

/* Popup Styles */
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7); /* Fondo oscuro semitransparente */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000; /* Asegura que esté por encima de todo */
}

.popup-overlay.hidden {
    display: none;
}

.popup-content {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
    max-width: 400px;
    width: 90%;
    transform: scale(0.9); /* Pequeña animación al aparecer */
    transition: transform 0.2s ease-out;
}

.popup-overlay:not(.hidden) .popup-content {
    transform: scale(1);
}

.popup-content h2 {
    color: var(--accent-color);
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.popup-content p {
    font-size: 1.4rem;
    margin-bottom: 30px;
}

.game-info {
    font-size: 1.2rem;
    color: var(--text-color);
    margin-bottom: 15px;
}

.btn {
    background-color: var(--accent-color);
    color: var(--bg-color);
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #258cdb; /* Slightly darker accent */
}