* {
    box-sizing: border-box;
}

body {
    font-family: system-ui, sans-serif;
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: white;
    display: flex;
    justify-content: center;
    padding: 20px;
}

#game-container {
    background: rgba(0, 0, 0, 0.85);
    padding: 20px;
    border-radius: 14px;
    width: 100%;
    max-width: 850px;
}

input, select, button {
    width: 100%;
    padding: 10px;
    margin: 6px 0;
    border-radius: 8px;
    border: none;
}

button {
    font-weight: bold;
    cursor: pointer;
}

#upgrade-screen,
#game-screen {
    display: none;
}

.actions {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
}

.actions button {
    background: #444;
    color: white;
}

.sidebar {
    margin-top: 15px;
    background: rgba(255, 255, 255, 0.1);
    padding: 12px;
    border-radius: 10px;
}

#combo-list {
    color: gold;
    min-height: 60px;
    font-weight: bold;
}

#mini-game-box {
    background: rgba(255, 255, 255, 0.1);
    padding: 10px;
    border-radius: 10px;
    margin-top: 10px;
    min-height: 80px;
}

#mini-game-box button {
    background: #333;
    color: white;
}

.bottom {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}