:root {
    --grid-rows: 9;
    --grid-cols: 9;
    --cell-size: 24px;
    --grid-gap: 2px;
    --color-bg: #f0f0f0;
    --color-border: #7b7b7b;
    --color-border-light: #ffffff;
    --color-bg-revealed: #bdbdbd;
    --color-text: #000000;
}

body {
    font-family: 'Roboto Mono', monospace;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 2rem;
    padding-bottom: 2rem;
    min-height: 100vh;
    background-color: var(--color-bg);
    color: var(--color-text);
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
}

#game-container {
    background-color: #c0c0c0;
    padding: 15px;
    border: 3px solid;
    border-color: var(--color-border-light) var(--color-border) var(--color-border) var(--color-border-light);
    box-shadow: 5px 5px 10px rgba(0,0,0,0.2);
    display: flex;
    flex-direction: column;
    max-width: 100vw;
}

h1 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.5rem;
}

#difficulty-selector {
    display: flex;
    justify-content: center;
    margin-bottom: 10px;
    gap: 5px;
}

.difficulty-btn {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.9rem;
    padding: 5px 10px;
    cursor: pointer;
    background-color: #c0c0c0;
    border: 2px solid;
    border-color: var(--color-border-light) var(--color-border) var(--color-border) var(--color-border-light);
    font-weight: bold;
}

.difficulty-btn.active, .difficulty-btn:active {
    border-color: var(--color-border);
    background-color: #dbdbdb;
}

.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--color-bg-revealed);
    padding: 8px;
    margin-bottom: 15px;
    border: 2px solid;
    border-color: var(--color-border) var(--color-border-light) var(--color-border-light) var(--color-border);
}

#mine-counter, #timer {
    background-color: #000;
    color: #ff0000;
    padding: 5px 10px;
    font-size: 1.5rem;
    letter-spacing: 2px;
}

#reset-button {
    font-size: 2rem;
    width: 50px;
    height: 50px;
    border: 2px solid;
    border-color: var(--color-border-light) var(--color-border) var(--color-border) var(--color-border-light);
    background-color: #c0c0c0;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
}

#reset-button:active {
    border-color: var(--color-border);
    transform: translate(1px, 1px);
}

#grid-wrapper {
    overflow-x: auto;
    padding-bottom: 5px; /* for scrollbar */
    margin-left: -3px; /* align with border */
    margin-right: -3px; /* align with border */
}

#grid {
    display: grid;
    grid-template-rows: repeat(var(--grid-rows), var(--cell-size));
    grid-template-columns: repeat(var(--grid-cols), var(--cell-size));
    gap: var(--grid-gap);
    background-color: var(--color-border);
    border: 3px solid;
    border-color: var(--color-border) var(--color-border-light) var(--color-border-light) var(--color-border);
    padding: 0;
    width: fit-content;
}

.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    background-color: #c0c0c0;
    border: 3px solid;
    border-color: var(--color-border-light) var(--color-border) var(--color-border) var(--color-border-light);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: calc(var(--cell-size) * 0.6);
    font-weight: bold;
    cursor: pointer;
    font-family: inherit; /* Ensure buttons use the mono font */
    padding: 0; /* Override default button padding */
}

.cell:not(.revealed):active {
     background-color: var(--color-bg-revealed);
     border: 1px solid var(--color-border);
}

.cell.revealed {
    background-color: var(--color-bg-revealed);
    border: 1px solid var(--color-border);
    cursor: default;
}

.cell.flagged::before { content: '🚩'; }
.cell.mine::before { content: '💣'; }
.cell.mine-hit::before { content: '💥'; background-color: red;}

.cell[data-count="1"] { color: #0000ff; }
.cell[data-count="2"] { color: #008100; }
.cell[data-count="3"] { color: #ff1300; }
.cell[data-count="4"] { color: #000083; }
.cell[data-count="5"] { color: #810500; }
.cell[data-count="6"] { color: #2a9494; }
.cell[data-count="7"] { color: #000000; }
.cell[data-count="8"] { color: #808080; }

.mode-selector {
    display: flex;
    justify-content: center;
    margin-top: 15px;
    gap: 10px;
}

.mode-selector input[type="radio"] {
    display: none;
}

.mode-selector label {
    font-size: 2.5rem;
    padding: 5px;
    border: 3px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.1s, border-color 0.2s;
}

.mode-selector input[type="radio"]:checked + label {
    border-color: var(--color-border);
    background-color: #dbdbdb;
    transform: scale(1.1);
}

#modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

#modal.hidden {
    display: none;
}

.modal-content {
    background: #c0c0c0;
    padding: 30px 40px;
    text-align: center;
    border: 3px solid;
    border-color: var(--color-border-light) var(--color-border) var(--color-border) var(--color-border-light);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

#modal-message {
    margin: 0 0 20px 0;
    font-size: 2rem;
}

#modal-reset-button {
    font-family: 'Roboto Mono', monospace;
    font-weight: bold;
    font-size: 1.2rem;
    padding: 10px 20px;
    cursor: pointer;
    background-color: #c0c0c0;
    border: 2px solid;
    border-color: var(--color-border-light) var(--color-border) var(--color-border) var(--color-border-light);
}

#modal-reset-button:active {
    border-color: var(--color-border);
}