:root {
    --bg-color: #1a1a1a;
    --board-bg: #2d2d2d;
    --cell-bg: #3d3d3d;
    --cell-hover: #4d4d4d;
    --cell-revealed: #bba28b;
    /* Classic-ish beige/gray for revealed */
    --accent: #6c5ce7;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --mine-color: #fab1a0;
    --flag-color: #ff7675;

    --num-1: #0984e3;
    --num-2: #00b894;
    --num-3: #d63031;
    --num-4: #6c5ce7;
    --num-5: #fdcb6e;
    --num-6: #00cec9;
    --num-7: #2d3436;
    --num-8: #636e72;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    user-select: none;
    -webkit-user-select: none;
    /* iOS Safari */
    overflow: hidden;
    /* Prevent pull-to-refresh on mobile */
}

.container {
    width: 100%;
    max-width: 95vw;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    overflow-x: auto;
}

/* Mode Selection */
.title {
    font-size: 2rem;
    margin: 0 0 10px 0;
    text-align: center;
}

.best-time {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.mode-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
}

.mode-btn {
    background: var(--board-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    transition: transform 0.1s, background 0.2s;
}

.mode-btn:active {
    transform: scale(0.98);
    background: var(--cell-bg);
}

.mode-name {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.mode-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.back-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    margin-top: 10px;
}

.header {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.2rem;
    font-weight: 700;
}

.reset-btn {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    transition: transform 0.1s;
}

.reset-btn:active {
    transform: scale(0.9);
}

.game-board {
    display: grid;
    grid-template-columns: repeat(var(--cols, 10), minmax(20px, 1fr));
    grid-template-rows: repeat(var(--rows, 10), minmax(20px, 1fr));
    gap: 2px;
    background: var(--board-bg);
    padding: 4px;
    border-radius: 8px;
    width: max-content;
    min-width: 100%;
}

.cell {
    background: var(--cell-bg);
    border-radius: 2px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    cursor: pointer;
    font-size: clamp(0.8rem, 3vw, 1.2rem);
    line-height: 1;
    aspect-ratio: 1;
    position: relative;
    border: 1px solid #555;
    contain: strict;
    /* CSS containment for performance */
    overflow: hidden;
}

.cell:active {
    background: var(--cell-hover);
}

.cell.revealed {
    background: var(--cell-revealed);
    box-shadow: none;
    border: 1px solid rgba(0, 0, 0, 0.1);
    color: #333;
}

/* Flag uses absolute positioning to avoid layout shift */
.cell.flagged::before {
    content: "🚩";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.9em;
}

.cell.mine.revealed {
    background: #d63031;
}

/* Number colors */
.cell[data-num="1"] {
    color: var(--num-1);
}

.cell[data-num="2"] {
    color: var(--num-2);
}

.cell[data-num="3"] {
    color: var(--num-3);
}

.cell[data-num="4"] {
    color: var(--num-4);
}

.cell[data-num="5"] {
    color: var(--num-5);
}

.cell[data-num="6"] {
    color: var(--num-6);
}

.cell[data-num="7"] {
    color: var(--num-7);
}

.cell[data-num="8"] {
    color: var(--num-8);
}

/* Toggle Switch */
.controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    width: 100%;
}

.toggle-container {
    position: relative;
    width: 120px;
    height: 40px;
}

#flag-mode-toggle {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-label {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--cell-bg);
    transition: .4s;
    border-radius: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.mode-icon {
    margin-right: 8px;
}

/* Checked state logic for Toggle */
#flag-mode-toggle:checked+.toggle-label {
    background-color: var(--flag-color);
    color: #fff;
}

#flag-mode-toggle:checked+.toggle-label .mode-text::before {
    content: "Flag";
}

#flag-mode-toggle:checked+.toggle-label .mode-icon::before {
    content: "🚩";
    /* ensure icon logic if needed */
}

/* Default state logic */
.mode-text::before {
    content: "Reveal";
}

#flag-mode-toggle:checked+.toggle-label .mode-text {
    font-size: 0;
    /* Hide default text */
}

#flag-mode-toggle:checked+.toggle-label .mode-text::after {
    content: "Flag";
    font-size: 1rem;
}

#flag-mode-toggle:checked+.toggle-label .mode-icon {
    display: none;
}

#flag-mode-toggle:checked+.toggle-label::after {
    content: "🚩";
    margin-right: 5px;
}


.hint {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Modal */
.modal {
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
}

.hidden {
    display: none !important;
}

.modal-content {
    background-color: var(--board-bg);
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popIn {
    from {
        transform: scale(0.8);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

#modal-close {
    padding: 10px 20px;
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    font-weight: bold;
    margin-top: 20px;
}