body {
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #3a7bd5 0%, #00d2ff 100%);
    font-family: 'Arial', sans-serif;
}

.container {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 15px 50px rgba(0,0,0,0.3);
    text-align: center;
}

h1 {
    color: #3a7bd5;
    margin: 0 0 20px 0;
    font-size: 32px;
}

.setup-screen {
    display: block;
}

.game-screen {
    display: none;
}

.setup-form {
    margin: 20px 0;
}

.form-group {
    margin: 15px 0;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 5px;
    color: #333;
    font-weight: bold;
}

input {
    width: 100%;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    box-sizing: border-box;
}

.difficulty-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin: 20px 0;
}

.difficulty-btn {
    padding: 20px 10px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border: 3px solid #ddd;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
}

.difficulty-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    border-color: #3a7bd5;
}

button {
    padding: 12px 40px;
    font-size: 18px;
    background: #3a7bd5;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
    margin: 10px 5px;
}

button:hover {
    background: #2868c7;
}

.home-button {
    background: white;
    color: #3a7bd5;
    border: 2px solid #3a7bd5;
    text-decoration: none;
    display: inline-block;
    padding: 12px 40px;
    font-size: 18px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    margin: 10px 5px;
    font-weight: bold;
}

.home-button:hover {
    background: #3a7bd5;
    color: white;
}

.info-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    font-size: 20px;
    font-weight: bold;
}

.info-item {
    padding: 10px 20px;
    background: #f0f0f0;
    border-radius: 8px;
}

#gameBoard {
    display: inline-grid;
    gap: 1px;
    background: #999;
    padding: 1px;
    border-radius: 5px;
}

.cell {
    width: 30px;
    height: 30px;
    background: #ccc;
    border: 2px outset #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-weight: bold;
    font-size: 14px;
    user-select: none;
}

.cell:hover {
    background: #bbb;
}

.cell.revealed {
    background: #eee;
    border: 1px solid #999;
    cursor: default;
}

.cell.revealed:hover {
    background: #eee;
}

.cell.flagged {
    background: #ffd700;
}

.cell.mine {
    background: #ff4444;
}

/* WCAG AA compliant colors - improved contrast */
.color-1 { color: #0000CC; } /* dark blue - was blue */
.color-2 { color: #008000; } /* dark green - was green */
.color-3 { color: #CC0000; } /* dark red - was red */
.color-4 { color: #660099; } /* dark purple - was purple */
.color-5 { color: #800000; } /* maroon - already good */
.color-6 { color: #008B8B; } /* dark cyan - was turquoise */
.color-7 { color: #000000; } /* black - already good */
.color-8 { color: #666666; } /* dark gray - was gray */

.game-over-msg {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    font-size: 20px;
    font-weight: bold;
}

.game-over-msg.win {
    background: #4CAF50;
    color: white;
}

.game-over-msg.lose {
    background: #ff4444;
    color: white;
}

/* Responsive Design */
@media (max-width: 1024px) {
    body {
        padding: 15px;
    }

    .container {
        padding: 25px;
        max-width: 100%;
    }

    .difficulty-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .difficulty-btn {
        padding: 15px 8px;
    }
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 20px;
        width: 100%;
        max-width: 600px;
    }

    h1 {
        font-size: 26px;
        margin-bottom: 15px;
    }

    .difficulty-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .difficulty-btn {
        padding: 12px 6px;
    }

    .difficulty-btn div:first-child {
        font-size: 24px;
    }

    .difficulty-btn div:nth-child(2) {
        font-size: 15px;
    }

    .difficulty-btn div:nth-child(3),
    .difficulty-btn div:nth-child(4) {
        font-size: 12px;
    }

    .info-bar {
        font-size: 16px;
        flex-wrap: wrap;
        gap: 10px;
        justify-content: center;
    }

    .info-item {
        padding: 8px 15px;
        font-size: 14px;
    }

    #gameBoard {
        max-width: 100%;
        overflow-x: auto;
    }

    .cell {
        width: 28px;
        height: 28px;
        font-size: 13px;
    }

    button,
    .home-button {
        padding: 10px 25px;
        font-size: 16px;
    }

    .game-over-msg {
        font-size: 18px;
        padding: 12px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 5px;
    }

    .container {
        padding: 15px;
        border-radius: 12px;
    }

    h1 {
        font-size: 22px;
        margin-bottom: 12px;
    }

    .difficulty-buttons {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .difficulty-btn {
        padding: 10px 5px;
    }

    .difficulty-btn div:first-child {
        font-size: 20px;
    }

    .difficulty-btn div:nth-child(2) {
        font-size: 14px;
    }

    .difficulty-btn div:nth-child(3),
    .difficulty-btn div:nth-child(4) {
        font-size: 11px;
    }

    .info-bar {
        font-size: 14px;
        gap: 8px;
    }

    .info-item {
        padding: 6px 12px;
        font-size: 12px;
    }

    .cell {
        width: 24px;
        height: 24px;
        font-size: 12px;
        border-width: 1px;
    }

    button,
    .home-button {
        width: 100%;
        padding: 10px 20px;
        font-size: 14px;
        margin: 8px 0;
    }

    .game-over-msg {
        font-size: 16px;
        padding: 10px;
    }
}

@media (max-width: 380px) {
    .cell {
        width: 20px;
        height: 20px;
        font-size: 10px;
    }

    h1 {
        font-size: 20px;
    }

    .info-item {
        padding: 5px 10px;
        font-size: 11px;
    }
}