@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap');

:root {
    --primary-text: #2c3e50;
    --secondary-text: #34495e;
    --primary-bg: #ecf0f1;
    --secondary-bg: #ffffff;
    --border-color: #bdc3c7;
    --accent-color: #3498db;
    --found-color: #2ecc71;
    --selecting-color: #f1c40f;
    --shadow-color: rgba(0,0,0,0.1);
}

body.dark-mode {
    --primary-text: #ecf0f1;
    --secondary-text: #bdc3c7;
    --primary-bg: #2c3e50;
    --secondary-bg: #34495e;
    --border-color: #566573;
    --accent-color: #5dade2;
    --found-color: #27ae60;
    --selecting-color: #f39c12;
    --shadow-color: rgba(0,0,0,0.4);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--primary-bg);
    color: var(--primary-text);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    margin: 0;
    padding: 10px;
    min-height: 100vh;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}

.main-container {
    width: 100%;
    max-width: 1000px;
}

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

.header-top {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

h1 {
    color: var(--primary-text);
    margin: 0;
}

#dark-mode-toggle {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--primary-text);
    transition: background-color 0.3s, border-color 0.3s;
}

#dark-mode-toggle:hover {
    background-color: var(--secondary-bg);
}

#difficulty-buttons button {
    font-family: 'Poppins', sans-serif;
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 10px 15px;
    margin: 5px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
    font-size: 1em;
}

#difficulty-buttons button:hover {
    filter: brightness(1.1);
}

#difficulty-buttons button.active {
    background-color: var(--primary-text);
    color: var(--primary-bg);
    box-shadow: 0 0 10px var(--shadow-color);
}

.game-container {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: center;
}

#grid-container {
    display: grid;
    border: 2px solid var(--accent-color);
    background-color: var(--border-color);
    gap: 1px;
    width: 100%;
    max-width: 600px;
    grid-template-columns: repeat(var(--grid-size, 10), 1fr);
    grid-template-rows: repeat(var(--grid-size, 10), 1fr);
}

.grid-cell {
    background-color: var(--secondary-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    text-transform: uppercase;
    cursor: pointer;
    user-select: none;
    transition: background-color 0.2s, color 0.2s;
    aspect-ratio: 1 / 1;
    font-size: clamp(0.7rem, 2.5vw, 1.5rem);
    font-weight: 600;
}

.grid-cell.selecting {
    background-color: var(--selecting-color);
    color: white;
}

.grid-cell.found {
    background-color: var(--found-color);
    color: white;
}

.sidebar {
    background-color: var(--secondary-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 10px var(--shadow-color);
    width: 250px;
    flex-shrink: 0;
}

.sidebar h2 {
    margin-top: 0;
    border-bottom: 2px solid var(--primary-bg);
    padding-bottom: 10px;
    font-size: 1.2rem;
}

#word-counter {
    font-weight: 600;
    color: var(--accent-color);
}

#word-list {
    list-style: none;
    padding: 0;
    font-size: 1.1em;
    color: var(--secondary-text);
}

#word-list li.found-word {
    text-decoration: line-through;
    color: var(--border-color);
    font-style: italic;
}

#win-message {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(44, 62, 80, 0.95);
    color: white;
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    z-index: 1000;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    width: 90%;
    max-width: 500px;
}

#win-message.hidden {
    display: none;
}

@media (max-width: 768px) {
    body {
        padding: 5px;
    }
    .game-container {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }
    #grid-container {
        width: 95%;
        max-width: none;
    }
    .sidebar {
        width: 95%;
    }
    #dark-mode-toggle {
        position: static;
        transform: none;
        margin-top: 10px;
    }
     .header-top {
        flex-direction: column;
    }
}