body {
    font-family: Arial, sans-serif;
    background-color: #1e1e24;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

#main-layout {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    justify-content: center;
    gap: 40px;
    max-width: 900px;
    width: 100%;
    padding: 20px;
    box-sizing: border-box;
}

#sidebar {
    background-color: #222831;
    border-left: 4px solid #00adb5;
    padding: 20px;
    border-radius: 4px;
    max-width: 450px;
    width: 100%;
    text-align: left;
    box-sizing: border-box;
}

#sidebar h3 {
    margin-top: 0;
    color: #00adb5;
    font-size: 1.4rem;
}

.science-section {
    margin-top: 5px;
    padding: 3px 7px 7px 7px;
}

.science-section h4 {
    margin: 5px 0;
    color: #eeeeee;
}

.science-section p {
    font-size: 0.9rem;
    color: #ccc;
    line-height: 1.4;
    margin: 0;
}

.active-science {
    background: #393e46;
    border-radius: 5px;
}

#game-container {
    text-align: center;
}

#status-line {
    margin-bottom: 20px;
    font-size: 1.2rem;
    color: #00adb5;
}

#tiebreaker-line {
    margin-top: -10px;
    margin-bottom: 25px;
    font-size: 0.95rem;
    color: #aaa;
    font-style: italic;
}

#board {
    display: grid;
    grid-template-columns: repeat(3, minmax(80px, 120px));
    grid-template-rows: repeat(3, minmax(80px, 120px));
    gap: 8px;
    background-color: #393e46;
    padding: 8px;
    border-radius: 8px;
    margin: 0 auto;
}

.cell {
    background-color: #222831;
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    transition: background 0.2s;
}

.cell:hover {
    background-color: #2b323c;
}

.cell.selected {
    outline: 3px solid #eeeeee;
    background-color: #2b323c;
}

.quantum-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    height: 100%;
    width: 100%;
    box-sizing: border-box;
    padding: 6px;
    gap: 4px;
}

.q-mark {
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 2px;
}

.classical {
    display: none;
    position: absolute;
    inset: 0;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    font-weight: bold;
}

.cell.collapsed .quantum-grid {
    display: none;
}

.cell.collapsed .classical {
    display: flex;
}

.X {
    color: #00adb5 !important;
}

.O {
    color: #ff5722 !important;
}

.q-mark.X {
    color: rgba(0, 173, 181, 0.7) !important;
}

.q-mark.O {
    color: rgba(255, 87, 34, 0.7) !important;
}

#board.collapsing-mode .cell:not(.in-cycle) {
    opacity: 0.25;
    cursor: not-allowed;
    pointer-events: none;
}

#board.collapsing-mode .cell.in-cycle {
    outline: 3px dashed #bd93f9;
    background-color: #282a36;
}

.cell.winner-cell {
    outline: 4px solid #4caf50 !important;
    background-color: #1b3820 !important;
    z-index: 10;
}

#reset-btn {
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #00adb5;
    border: none;
    color: white;
    font-size: 1rem;
    border-radius: 4px;
    cursor: pointer;
}

#reset-btn:hover {
    background-color: #008c95;
}

#mode-btn {
    background-color: #393e46;
    color: #eeeeee;
    border: 2px solid #00adb5;
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-left: 10px;
}

#mode-btn.multiplayer {
    border-color: #4caf50;
    box-shadow: 0 0 5px rgba(76, 175, 80, 0.2);
}

#mode-btn.vs-bot {
    border-color: #bd93f9;
    box-shadow: 0 0 5px rgba(189, 147, 249, 0.2);
}

#mode-btn:hover {
    transform: translateY(-1px);
    filter: brightness(1.2);
}

@media (max-width: 800px) {
    body {
        height: auto;
        padding: 20px 0;
    }

    #main-layout {
        flex-direction: column-reverse;
        align-items: center;
        gap: 30px;
    }

    #sidebar {
        max-width: 384px;
        border-left: none;
        border-top: 4px solid #00adb5;
    }
}