:root {
    --background-color: #efc541;
    --text-color: #ffffff;
    --tile-bg: #1f1f1f;
    --tile-selected-bg: #5a5a5a;
    --border-color: #5a5a5a;
    --button-bg: #3a3a3a;
    --button-hover-bg: #4a4a4a;
    --button-disabled-bg: #2a2a2a;
    --button-disabled-text: #666;

    --difficulty-0: #f9df6d; /* Yellow */
    --difficulty-1: #a0c35a; /* Green */
    --difficulty-2: #80a6cd; /* Blue */
    --difficulty-3: #b386e8; /* Purple */

    --font-family: "Poppins", sans-serif;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
}

.logo {
    width: 250px;
    height: auto;
    margin-bottom: 15px;
}

header {
    text-align: center;
    margin-bottom: 20px;
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
}

header p {
    margin: 5px 0 0;
    font-size: 1.1rem;
    color: #1f1f1f;
}

#game-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 600px;
}

#solved-groups {
    width: 100%;
    margin-bottom: 10px;
}

.solved-group {
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 10px;
    animation: fadeIn 0.5s ease-in-out;
}

.solved-group.difficulty-0 {
    background-color: var(--difficulty-0);
    color: #000;
}
.solved-group.difficulty-1 {
    background-color: var(--difficulty-1);
    color: #000;
}
.solved-group.difficulty-2 {
    background-color: var(--difficulty-2);
    color: #000;
}
.solved-group.difficulty-3 {
    background-color: var(--difficulty-3);
    color: #000;
}

.solved-category {
    font-weight: 700;
    text-transform: uppercase;
}

.solved-items {
    font-weight: 600;
}

#puzzle-grid {
    display: grid;
    /* MUDANÇA PRINCIPAL: grid 4x4 novamente */
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    width: 100%;
    margin-bottom: 20px;
}

.grid-item {
    background-color: var(--tile-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    height: 70px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    transition:
        background-color 0.2s,
        transform 0.1s;
    font-size: 0.9rem;
    padding: 5px;
}

.grid-item.selected {
    background-color: var(--tile-selected-bg);
    color: var(--text-color);
    transform: scale(0.95);
}

#mistakes-container {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

#mistakes-counter {
    display: flex;
    gap: 8px;
    margin-left: 10px;
}

.mistake-dot {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: var(--tile-bg);
    border: 1px solid var(--border-color);
}

.mistake-dot.used {
    background-color: var(--text-color);
}

#controls {
    display: flex;
    gap: 15px;
}

#controls button {
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    padding: 12px 25px;
    border-radius: 25px;
    border: none;
    cursor: pointer;
    background-color: var(--button-bg);
    color: var(--text-color);
    transition: background-color 0.2s;
}

#controls button:hover:not(:disabled) {
    background-color: var(--button-hover-bg);
}

#controls button:disabled {
    background-color: var(--button-disabled-bg);
    color: var(--button-disabled-text);
    cursor: not-allowed;
}

@keyframes shake {
    0%,
    100% {
        transform: translateX(0);
    }
    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-5px);
    }
    20%,
    40%,
    60%,
    80% {
        transform: translateX(5px);
    }
}

.shake {
    animation: shake 0.5s ease-in-out;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.3s;
}

.modal-content {
    background-color: var(--tile-bg);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    max-width: 90%;
    width: 500px;
}

#results-grid {
    margin: 20px 0;
}

#countdown-container p {
    margin-bottom: 5px;
}

#countdown-timer {
    font-size: 1.5rem;
    font-weight: 700;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@media (max-width: 640px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 2rem;
    }

    .grid-item {
        height: 65px;
        font-size: 0.8rem;
    }
}
/* ... (todo o seu CSS existente) ... */

/* Estilos do Botão FAQ */
#faq-button,
#play-again-button {
    font-family: var(--font-family);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 8px 18px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    background-color: transparent;
    color: var(--text-color);
    transition: background-color 0.2s;
    margin-top: 15px;
}

#faq-button:hover,
#play-again-button:hover {
    background-color: var(--button-bg);
}

/* Estilos do Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.3s;
}

.modal-content {
    background-color: var(--tile-bg);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    max-width: 90%;
    width: 500px;
    position: relative; /* Adicionado para posicionar o botão de fechar */
}

.modal-content h2 {
    margin-top: 0;
}

.modal-content ul {
    text-align: left;
    display: inline-block;
    margin-top: 15px;
}

.modal-content ul li {
    margin-bottom: 10px;
}

.close-button {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 2rem;
    cursor: pointer;
}
footer {
    width: 100%;
    text-align: center;
    padding: 20px 0;
    margin-top: auto; /* Empurra o rodapé para o final da página */
    color: black;
    opacity: 0.7;
    font-size: 0.9rem;
}