:root {
    --bg-color: #1a1d21;
    --board-bg-color: #2c313a;
    --cell-color: #3a404a;
    --cell-revealed-color: #2c313a;
    --text-color: #e0e0e0;
    --header-color: #ffffff;
    --accent-color: #4a90e2;
    --mine-color: #e94f37;
    --flag-color: #f5a623;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

.game-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
    max-width: fit-content;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.game-header h1 {
    color: var(--header-color);
    font-size: 2.5rem;
    margin: 0;
    white-space: nowrap;
}

.game-controls {
    display: flex;
    gap: 15px;
}

#difficulty, #new-game-button {
    background-color: var(--cell-color);
    color: var(--text-color);
    border: 1px solid var(--board-bg-color);
    border-radius: 8px;
    padding: 10px 15px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#new-game-button {
    background-color: var(--accent-color);
    font-weight: bold;
}

#difficulty:hover, #new-game-button:hover {
    background-color: #454c5a;
}

.back-link {
    display: inline-block;
    background-color: var(--cell-color);
    color: var(--text-color);
    border: 1px solid var(--board-bg-color);
    border-radius: 8px;
    padding: 10px 15px;
    font-size: 1rem;
    text-decoration: none;
    transition: background-color 0.2s;
}

.back-link:hover {
    background-color: #454c5a;
}

.game-info {
    display: flex;
    justify-content: space-around;
    background-color: var(--board-bg-color);
    padding: 15px;
    border-radius: 8px;
    font-size: 1.5rem;
    font-weight: bold;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.game-board-container {
    background-color: var(--board-bg-color);
    padding: 4px;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

#game-board {
    display: grid;
    gap: 4px;
    background-color: var(--bg-color);
}

.cell {
    width: 30px;
    height: 30px;
    background-color: var(--cell-color);
    border-radius: 4px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.15s ease-in-out;
}

.cell:hover {
    background-color: #4a5260;
}

.cell.revealed {
    background-color: var(--cell-revealed-color);
    cursor: default;
}

.cell.mine {
    background-color: var(--mine-color);
}

.cell.flagged {
    color: var(--flag-color);
}

.cell[data-mines="1"] { color: #4a90e2; }
.cell[data-mines="2"] { color: #50e3c2; }
.cell[data-mines="3"] { color: #e94f37; }
.cell[data-mines="4"] { color: #9013fe; }
.cell[data-mines="5"] { color: #f5a623; }
.cell[data-mines="6"] { color: #bd10e0; }
.cell[data-mines="7"] { color: #d0021b; }
.cell[data-mines="8"] { color: #417505; }