:root {
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --container-bg: rgba(255, 255, 255, 0.95);
    --primary-color: #4a90e2;
    --secondary-color: #f8f9fa;
    --text-color: #2d3436;
    --accent-color: #e74c3c;
    --grid-gap: 4px;
    --cell-size: 35px;
    --cell-bg: #dfe6e9;
    --cell-hover: #b2bec3;
    --cell-revealed: #ffffff;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    --radius: 16px;
    --font-main: 'Inter', sans-serif;
}

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

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

.game-container {
    background-color: var(--container-bg);
    backdrop-filter: blur(10px);
    padding: 2.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    max-width: 100%;
    transition: transform 0.3s ease;
}

.game-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    width: 100%;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-color);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    letter-spacing: -1px;
}

.controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

select {
    padding: 0.8rem 1.5rem;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    background-color: white;
    transition: border-color 0.2s;
}

select:focus {
    border-color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 6px rgba(74, 144, 226, 0.3);
}

.btn:hover {
    background-color: #357abd;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(74, 144, 226, 0.4);
}

.btn:active {
    transform: translateY(0);
}

.game-stats {
    display: flex;
    gap: 3rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-box {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    background-color: var(--secondary-color);
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.grid-wrapper {
    overflow: auto;
    max-width: 95vw;
    max-height: 75vh;
    padding: 15px;
    border-radius: var(--radius);
    background-color: rgba(0, 0, 0, 0.03);
}

.grid {
    display: grid;
    gap: var(--grid-gap);
    user-select: none;
    padding: var(--grid-gap);
}

.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    background-color: var(--cell-bg);
    border-radius: 6px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 800;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.1);
}

.cell:hover:not(.revealed):not(.flagged) {
    background-color: var(--cell-hover);
    transform: translateY(-2px);
}

.cell.revealed {
    background-color: var(--cell-revealed);
    cursor: default;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.cell.flagged {
    background-color: #ffeaa7;
    color: var(--accent-color);
}

.cell.mine {
    background-color: var(--accent-color);
    color: white;
    animation: shake 0.5s;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

/* Number colors */
.cell[data-value="1"] {
    color: #3498db;
}

.cell[data-value="2"] {
    color: #2ecc71;
}

.cell[data-value="3"] {
    color: #e74c3c;
}

.cell[data-value="4"] {
    color: #9b59b6;
}

.cell[data-value="5"] {
    color: #f1c40f;
}

.cell[data-value="6"] {
    color: #1abc9c;
}

.cell[data-value="7"] {
    color: #34495e;
}

.cell[data-value="8"] {
    color: #7f8c8d;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .game-container {
        padding: 1.5rem;
        gap: 1.5rem;
    }

    h1 {
        font-size: 2rem;
    }

    .game-stats {
        gap: 1.5rem;
        font-size: 1.2rem;
    }

    :root {
        --cell-size: 28px;
    }
}