.upgrade-panel {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%) translateX(100%);
    width: 260px;
    max-height: 80vh;
    background: var(--bg-panel);
    border: 1px solid var(--glass-border);
    border-right: none;
    border-radius: 10px 0 0 10px;
    z-index: 30;
    pointer-events: auto;
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

.upgrade-panel.open {
    transform: translateY(-50%) translateX(0);
}

.upgrade-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
}

.upgrade-header h3 {
    font-size: 14px;
    letter-spacing: 3px;
    color: var(--primary);
}

.upgrade-close {
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 22px;
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
}

.upgrade-close:hover {
    color: var(--danger);
}

.upgrade-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.upgrade-list::-webkit-scrollbar {
    width: 4px;
}

.upgrade-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.upgrade-item {
    padding: 10px 12px;
    margin-bottom: 6px;
    background: rgba(255,255,255,0.02);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 6px;
    transition: border-color 0.2s;
}

.upgrade-item:hover {
    border-color: var(--glass-border);
}

.upgrade-name {
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--text-dim);
    font-weight: 600;
    margin-bottom: 4px;
}

.upgrade-level {
    font-size: 13px;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 6px;
}

.upgrade-stat {
    font-size: 10px;
    color: var(--text-dim);
    margin-bottom: 8px;
}

.upgrade-btn {
    width: 100%;
    padding: 7px;
    border: 1px solid var(--glass-border);
    border-radius: 4px;
    background: rgba(0, 180, 255, 0.08);
    color: var(--primary);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.2s;
}

.upgrade-btn:hover:not(:disabled) {
    background: rgba(0, 180, 255, 0.2);
    border-color: var(--primary);
}

.upgrade-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.upgrade-btn.maxed {
    opacity: 0.4;
    cursor: default;
    color: var(--text-dim);
}

.upgrade-crystals {
    padding: 10px 16px;
    border-top: 1px solid var(--border-color);
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--crystal-color);
    font-weight: 600;
    text-align: center;
}

.boss-bar {
    position: fixed;
    top: 50px;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    max-width: 80vw;
    z-index: 25;
    text-align: center;
    pointer-events: none;
}

.boss-name {
    font-size: 14px;
    letter-spacing: 4px;
    color: var(--danger);
    font-weight: 700;
    margin-bottom: 6px;
    text-shadow: 0 0 10px rgba(255, 50, 80, 0.5);
}

.boss-health-bar {
    width: 100%;
    height: 10px;
    background: rgba(255,255,255,0.06);
    border-radius: 5px;
    overflow: hidden;
    border: 1px solid rgba(255, 50, 80, 0.3);
}

.boss-health-fill {
    height: 100%;
    width: 100%;
    background: linear-gradient(90deg, #cc2244, var(--danger));
    box-shadow: 0 0 10px rgba(255, 50, 80, 0.5);
    border-radius: 4px;
    transition: width 0.3s ease;
}