:root {
    
    --bg-color: #1a1a1a;
    --container-bg: #2c3e50;
    --text-color: #ffffff;
    --cell-bg: #34495e;
    --accent-color: #f1c40f;
    --button-bg: #2980b9;
    --x-color: #e74c3c;
    --o-color: #2ecc71;
    --border-light: rgba(255,255,255,0.1);
}

body.light-mode {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #2c3e50;
    --cell-bg: #ecf0f1;
    --accent-color: #d35400;
    --button-bg: #3498db;
    --border-light: #edf2f7;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: all 0.3s ease;
}

.game-container {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    text-align: center;
    width: 350px;
}

h1 { margin: 0 0 15px; color: var(--accent-color); letter-spacing: -1px; }


#setup-section input {
    padding: 10px;
    border: 2px solid var(--border-light);
    border-radius: 8px;
    margin-bottom: 15px;
    width: 80%;
    background: var(--cell-bg);
    color: var(--text-color);
}

button {
    background: var(--button-bg);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
}

button:hover { filter: brightness(1.2); transform: scale(1.02); }

.theme-btn, .view-more-btn {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    margin: 10px 0;
}

.secondary-btn { background-color: #6c757d; }


.status { margin-bottom: 20px; font-weight: bold; color: var(--button-bg); }

.board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.cell {
    aspect-ratio: 1 / 1;
    background-color: var(--cell-bg);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid var(--border-light);
}

.cell:hover { transform: translateY(-3px); }
.cell.x { color: var(--x-color); }
.cell.o { color: var(--o-color); }


.leaderboard {
    margin-top: 25px;
    border-top: 1px solid var(--border-light);
    padding-top: 15px;
}

#leaderboard-list {
    list-style: none;
    padding: 0;
    text-align: left;
    font-size: 0.9rem;
}

#leaderboard-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
}

.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0; top: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--container-bg);
    margin: 10% auto;
    padding: 25px;
    border-radius: 15px;
    width: 85%;
    max-width: 450px;
    position: relative;
    border: 1px solid var(--border-light);
}

.ranking-table { width: 100%; border-collapse: collapse; }
.ranking-table th, .ranking-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.close-modal {
    position: absolute;
    right: 20px; top: 10px;
    font-size: 30px;
    cursor: pointer;
    color: var(--accent-color);
}


@keyframes popIn {
    0% { transform: scale(0.5); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}
.cell.x, .cell.o { animation: popIn 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275); }

@keyframes celebrate {
    from { transform: scale(1); box-shadow: 0 0 10px var(--accent-color); }
    to { transform: scale(1.1); box-shadow: 0 0 25px var(--accent-color); }
}

.cell.winner {
    animation: celebrate 0.8s ease-in-out infinite alternate;
    background-color: var(--accent-color) !important;
    color: #000 !important;
}

.cell.cpu-winner {
    animation: celebrate 0.8s ease-in-out infinite alternate;
    background-color: var(--x-color) !important;
    color: white !important;
}

@keyframes burn {
    from { filter: drop-shadow(0 0 2px orange); transform: scale(1); }
    to { filter: drop-shadow(0 0 7px red); transform: scale(1.2); }
}
.fire-icon { animation: burn 0.5s infinite alternate; display: inline-block; }
:root {
    
    --bg-color: #1a1a1a;
    --container-bg: #2c3e50;
    --text-color: #ffffff;
    --cell-bg: #34495e;
    --accent-color: #f1c40f;
    --button-bg: #2980b9;
    --x-color: #e74c3c;
    --o-color: #2ecc71;
    --border-light: rgba(255,255,255,0.1);
}

body.light-mode {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #2c3e50;
    --cell-bg: #ecf0f1;
    --accent-color: #d35400;
    --button-bg: #3498db;
    --border-light: #edf2f7;
}


body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: all 0.3s ease;
}

.game-container {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    text-align: center;
    width: 350px;
}

h1 { margin: 0 0 15px; color: var(--accent-color); letter-spacing: -1px; }


#setup-section input {
    padding: 10px;
    border: 2px solid var(--border-light);
    border-radius: 8px;
    margin-bottom: 15px;
    width: 80%;
    background: var(--cell-bg);
    color: var(--text-color);
}

button {
    background: var(--button-bg);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
}

button:hover { filter: brightness(1.2); transform: scale(1.02); }

.theme-btn, .view-more-btn {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    margin: 10px 0;
}

.secondary-btn { background-color: #6c757d; }


.status { margin-bottom: 20px; font-weight: bold; color: var(--button-bg); }

.board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.cell {
    aspect-ratio: 1 / 1;
    background-color: var(--cell-bg);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid var(--border-light);
}

.cell:hover { transform: translateY(-3px); }
.cell.x { color: var(--x-color); }
.cell.o { color: var(--o-color); }


.leaderboard {
    margin-top: 25px;
    border-top: 1px solid var(--border-light);
    padding-top: 15px;
}

#leaderboard-list {
    list-style: none;
    padding: 0;
    text-align: left;
    font-size: 0.9rem;
}

#leaderboard-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
}

.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0; top: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--container-bg);
    margin: 10% auto;
    padding: 25px;
    border-radius: 15px;
    width: 85%;
    max-width: 450px;
    position: relative;
    border: 1px solid var(--border-light);
}

.ranking-table { width: 100%; border-collapse: collapse; }
.ranking-table th, .ranking-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.close-modal {
    position: absolute;
    right: 20px; top: 10px;
    font-size: 30px;
    cursor: pointer;
    color: var(--accent-color);
}

@keyframes popIn {
    0% { transform: scale(0.5); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}
.cell.x, .cell.o { animation: popIn 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275); }

@keyframes celebrate {
    from { transform: scale(1); box-shadow: 0 0 10px var(--accent-color); }
    to { transform: scale(1.1); box-shadow: 0 0 25px var(--accent-color); }
}

.cell.winner {
    animation: celebrate 0.8s ease-in-out infinite alternate;
    background-color: var(--accent-color) !important;
    color: #000 !important;
}

.cell.cpu-winner {
    animation: celebrate 0.8s ease-in-out infinite alternate;
    background-color: var(--x-color) !important;
    color: white !important;
}

@keyframes burn {
    from { filter: drop-shadow(0 0 2px orange); transform: scale(1); }
    to { filter: drop-shadow(0 0 7px red); transform: scale(1.2); }
}
.fire-icon { animation: burn 0.5s infinite alternate; display: inline-block; }