.upgrade-button {
    position: fixed;
    bottom: 5%;
    left: 2%;
    cursor: pointer;
    z-index: 101;
    pointer-events: auto;
    background-color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    transition: background-color 0.2s;
    -webkit-tap-highlight-color: transparent; /* Remove tap highlight on mobile */
}

/* Desktop sizes */
@media (min-width: 1024px) {
    .upgrade-button {
        padding: 20px;
    }
    .upgrade-button img {
        width: 40px;
        height: 40px;
    }
}

/* Tablet sizes */
@media (min-width: 768px) and (max-width: 1023px) {
    .upgrade-button {
        padding: 18px;
    }
    .upgrade-button img {
        width: 35px;
        height: 35px;
    }
}

/* Mobile sizes */
@media (max-width: 767px) {
    .upgrade-button {
        padding: 15px;
        bottom: 3%;
    }
    .upgrade-button img {
        width: 30px;
        height: 30px;
    }
}

.upgrade-button:hover {
    background-color: #f0f0f0;
}

.upgrade-button:active {
    background-color: #e0e0e0;
}

.upgrade-button img {
    width: 40px;
    height: 40px;
}

.upgrade-tab-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex; /* Use flexbox for centering */
    justify-content: center;
    align-items: center;
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.upgrade-tab-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.upgrade-tab {
    position: relative;
    background-color: #222;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.4);
    color: white;
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

/* Desktop sizes */
@media (min-width: 1024px) {
    .upgrade-tab {
        width: 30%;
        height: 70%;
        padding: 25px;
    }
    .close-button {
        right: -60px;
    }
    .upgrade-icon {
        width: 80px;
        height: 80px;
    }
}

/* Tablet sizes */
@media (min-width: 768px) and (max-width: 1023px) {
    .upgrade-tab {
        width: 50%;
        height: 80%;
        padding: 20px;
    }
    .close-button {
        right: -50px;
    }
    .upgrade-icon {
        width: 70px;
        height: 70px;
    }
}

/* Mobile sizes */
@media (max-width: 767px) {
    .upgrade-tab {
        width: 90%;
        height: 90%;
        padding: 15px;
    }
    .close-button {
        top: -50px;
        right: 10px;
    }
    .upgrade-icon {
        width: 60px;
        height: 60px;
    }
    .upgrade-item {
        padding: 10px;
    }
    .detail-label {
        font-size: 1em;
    }
}

.upgrade-tab-overlay.visible .upgrade-tab {
    transform: scale(1);
}

.close-button {
    position: absolute;
    top: 20px;
    right: -60px;
    cursor: pointer;
    background-color: white;
    border-radius: 50%;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    transition: background-color 0.2s;
}

.close-button:hover {
    background-color: #f0f0f0;
}

.close-button:active {
    background-color: #e0e0e0;
}

.close-button img {
    width: 30px;
    height: 30px;
}

.upgrade-body {
    width: 100%;
    height: 100%;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
    -ms-overflow-style: none;  /* IE and Edge */
    scrollbar-width: none;  /* Firefox */
}

.upgrade-body::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

.upgrade-section {
    background-color: rgba(0,0,0,0.1);
    border-radius: 10px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.section-label {
    text-align: center;
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.5em;
}

.upgrade-item {
    display: flex;
    align-items: center;
    gap: 15px;
    background-color: rgba(0,0,0,0.15);
    padding: 15px;
    border-radius: 10px;
}

.upgrade-icon {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 3px solid rgba(255,255,255,0.5);
}

.upgrade-icon.auto-icon img {
    height: 60%;
    width: 60%;
    filter: invert(1);
}

/* Colors for icons */
.c1-icon { background-color: #e0e0e0; }
.c2-icon { background-color: #2ecc71; }
.c4-icon { background-color: #3498db; }
.c8-icon { background-color: #9b59b6; }
.c16-icon { background-color: #f1c40f; }
.c32-icon { background-color: #e67e22; }
.c64-icon { background-color: #e74c3c; }

.upgrade-icon .c-num {
    font-size: 2.5em;
    font-weight: bold;
    color: white;
    -webkit-text-stroke: 1.5px rgba(0,0,0,0.5);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.4);
}

.upgrade-details {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.detail-info {
    display: flex;
    flex-direction: column;
    gap: 5px;
    flex-grow: 1;
}

.detail-label {
    font-weight: bold;
    font-size: 1.1em;
}

.progress-counter {
    display: flex;
    gap: 4px;
    height: 12px;
}

.progress-part {
    flex-grow: 1;
    border-radius: 3px;
    position: relative;
}

.progress-part.active {
    background-color: #4caf50;
}

.progress-part.inactive {
    background-color: rgba(0,0,0,0.3);
    border: 1px solid rgba(0,0,0,0.5);
}

.progress-bubble {
    visibility: hidden;
    width: 120px;
    background-color: #555;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -60px;
    opacity: 0;
    transition: opacity 0.3s;
}

.progress-bubble::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #555 transparent transparent transparent;
}

.progress-part:hover .progress-bubble {
    visibility: visible;
    opacity: 1;
}

.upgrade-btn {
    padding: 8px 0;
    width: 100px;
    text-align: center;
    border: none;
    border-radius: 8px;
    background-color: #f1c40f;
    color: black;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    flex-shrink: 0;
}

.upgrade-btn:hover {
    background-color: #f39c12;
}

.upgrade-btn:active {
    transform: scale(0.95);
}