* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 10px;
}

.container {
    max-width: 500px;
    width: 100%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

h1 {
    text-align: center;
    color: #fff;
    font-size: 2em;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.game-info {
    text-align: center;
    color: #fff;
    margin-bottom: 20px;
    font-size: 1.1em;
}

#turn-info {
    margin-top: 5px;
    font-weight: bold;
}

.board {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
    background: #0a0a1a;
    padding: 10px;
    border-radius: 10px;
    margin-bottom: 20px;
    aspect-ratio: 7/6;
}

.cell {
    background: #1a1a3a;
    border-radius: 50%;
    aspect-ratio: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5em;
    font-weight: bold;
    transition: all 0.3s ease;
    cursor: pointer;
}

.cell.empty {
    background: #0a0a1a;
    border: 2px solid #2a2a4a;
}

.cell.player1 {
    background: #ff4444;
    color: #fff;
    box-shadow: 0 0 10px #ff4444, inset 0 0 10px rgba(255, 255, 255, 0.3);
}

.cell.player2 {
    background: #ffcc00;
    color: #000;
    box-shadow: 0 0 10px #ffcc00, inset 0 0 10px rgba(255, 255, 255, 0.3);
}

.cell:hover:not(.empty) {
    transform: scale(1.05);
}

.controls {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 20px;
}

.btn {
    padding: 12px 24px;
    font-size: 1em;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
}

#new-game-btn {
    background: #4CAF50;
    color: white;
}

#new-game-btn:hover {
    background: #45a049;
    transform: translateY(-2px);
}

#order-btn {
    background: #2196F3;
    color: white;
}

#order-btn:hover {
    background: #0b7dda;
    transform: translateY(-2px);
}

.column-buttons {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
    margin-top: 15px;
}

.column-btn {
    padding: 12px 5px;
    font-size: 1.2em;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #3a3a5a;
    color: white;
    aspect-ratio: 1;
}

.column-btn:hover {
    background: #4a4a7a;
    transform: translateY(-2px);
}

.column-btn:active {
    transform: translateY(0);
}

.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    z-index: 1000;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-top: 5px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading.hidden {
    display: none;
}

@media (max-width: 400px) {
    h1 {
        font-size: 1.5em;
    }
    
    .cell {
        font-size: 1.2em;
    }
    
    .column-btn {
        padding: 10px 3px;
        font-size: 1em;
    }
}